diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
new file mode 100644
index 0000000..681f41a
--- /dev/null
+++ b/.idea/codeStyles/Project.xml
@@ -0,0 +1,116 @@
+<component name="ProjectCodeStyleConfiguration">
+  <code_scheme name="Project" version="173">
+    <codeStyleSettings language="XML">
+      <indentOptions>
+        <option name="CONTINUATION_INDENT_SIZE" value="4" />
+      </indentOptions>
+      <arrangement>
+        <rules>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:android</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:id</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:name</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>name</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>style</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>ANDROID_ATTRIBUTE_ORDER</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>.*</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+        </rules>
+      </arrangement>
+    </codeStyleSettings>
+  </code_scheme>
+</component>
\ No newline at end of file
diff --git a/.idea/flutter_custom_calendar.iml b/.idea/flutter_custom_calendar.iml
index c1cf317..63725be 100644
--- a/.idea/flutter_custom_calendar.iml
+++ b/.idea/flutter_custom_calendar.iml
@@ -21,11 +21,10 @@
       <excludeFolder url="file://$MODULE_DIR$/.dart_tool" />
       <excludeFolder url="file://$MODULE_DIR$/.pub" />
       <excludeFolder url="file://$MODULE_DIR$/build" />
-      <excludeFolder url="file://$MODULE_DIR$/example/.android/Flutter/build/intermediates/flutter/debug/flutter_assets/packages" />
-      <excludeFolder url="file://$MODULE_DIR$/example/.android/Flutter/build/intermediates/library_assets/debug/packageDebugAssets/out/flutter_assets/packages" />
       <excludeFolder url="file://$MODULE_DIR$/example/.dart_tool" />
       <excludeFolder url="file://$MODULE_DIR$/example/.pub" />
       <excludeFolder url="file://$MODULE_DIR$/example/build" />
+      <excludeFolder url="file://$MODULE_DIR$/example/ios/Flutter/App.framework/flutter_assets/packages" />
     </content>
     <orderEntry type="jdk" jdkName="Android API 28 Platform" jdkType="Android SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
diff --git a/.idea/libraries/Dart_Packages.xml b/.idea/libraries/Dart_Packages.xml
index 023437b..ee146ca 100644
--- a/.idea/libraries/Dart_Packages.xml
+++ b/.idea/libraries/Dart_Packages.xml
@@ -2,177 +2,249 @@
   <library name="Dart Packages" type="DartPackagesLibraryType">
     <properties>
       <option name="packageNameToDirsMap">
+        <entry key="archive">
+          <value>
+            <list>
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/archive-2.0.13/lib" />
+            </list>
+          </value>
+        </entry>
+        <entry key="args">
+          <value>
+            <list>
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/args-1.6.0/lib" />
+            </list>
+          </value>
+        </entry>
         <entry key="async">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/async-2.1.0/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/async-2.4.1/lib" />
             </list>
           </value>
         </entry>
         <entry key="boolean_selector">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/boolean_selector-1.0.4/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/boolean_selector-2.0.0/lib" />
             </list>
           </value>
         </entry>
         <entry key="charcode">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/charcode-1.1.2/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/charcode-1.1.3/lib" />
             </list>
           </value>
         </entry>
         <entry key="collection">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/collection-1.14.11/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/collection-1.14.12/lib" />
+            </list>
+          </value>
+        </entry>
+        <entry key="convert">
+          <value>
+            <list>
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/convert-2.1.1/lib" />
+            </list>
+          </value>
+        </entry>
+        <entry key="crypto">
+          <value>
+            <list>
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/crypto-2.1.4/lib" />
             </list>
           </value>
         </entry>
         <entry key="cupertino_icons">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/cupertino_icons-0.1.2/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/cupertino_icons-0.1.2/lib" />
             </list>
           </value>
         </entry>
         <entry key="flutter">
           <value>
             <list>
-              <option value="$PROJECT_DIR$/../../FlutterSDK/flutter/packages/flutter/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/packages/flutter/lib" />
             </list>
           </value>
         </entry>
         <entry key="flutter_test">
           <value>
             <list>
-              <option value="$PROJECT_DIR$/../../FlutterSDK/flutter/packages/flutter_test/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/packages/flutter_test/lib" />
+            </list>
+          </value>
+        </entry>
+        <entry key="image">
+          <value>
+            <list>
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/image-2.1.12/lib" />
             </list>
           </value>
         </entry>
         <entry key="matcher">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/matcher-0.12.5/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/matcher-0.12.6/lib" />
             </list>
           </value>
         </entry>
         <entry key="meta">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/meta-1.1.6/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/meta-1.1.8/lib" />
+            </list>
+          </value>
+        </entry>
+        <entry key="nested">
+          <value>
+            <list>
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/nested-0.0.4/lib" />
             </list>
           </value>
         </entry>
         <entry key="path">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/path-1.6.2/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/path-1.6.4/lib" />
+            </list>
+          </value>
+        </entry>
+        <entry key="petitparser">
+          <value>
+            <list>
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/petitparser-2.4.0/lib" />
             </list>
           </value>
         </entry>
-        <entry key="pedantic">
+        <entry key="provider">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/pedantic-1.5.0/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/provider-4.1.3/lib" />
             </list>
           </value>
         </entry>
         <entry key="quiver">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/quiver-2.0.2/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/quiver-2.1.3/lib" />
+            </list>
+          </value>
+        </entry>
+        <entry key="random_pk">
+          <value>
+            <list>
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/random_pk-0.0.3/lib" />
             </list>
           </value>
         </entry>
         <entry key="sky_engine">
           <value>
             <list>
-              <option value="$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/pkg/sky_engine/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/pkg/sky_engine/lib" />
             </list>
           </value>
         </entry>
         <entry key="source_span">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/source_span-1.5.5/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/source_span-1.7.0/lib" />
             </list>
           </value>
         </entry>
         <entry key="stack_trace">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/stack_trace-1.9.3/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/stack_trace-1.9.3/lib" />
             </list>
           </value>
         </entry>
         <entry key="stream_channel">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/stream_channel-2.0.0/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/stream_channel-2.0.0/lib" />
             </list>
           </value>
         </entry>
         <entry key="string_scanner">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/string_scanner-1.0.4/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/string_scanner-1.0.5/lib" />
             </list>
           </value>
         </entry>
         <entry key="term_glyph">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/term_glyph-1.1.0/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/term_glyph-1.1.0/lib" />
             </list>
           </value>
         </entry>
         <entry key="test_api">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/test_api-0.2.4/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/test_api-0.2.15/lib" />
             </list>
           </value>
         </entry>
         <entry key="typed_data">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/typed_data-1.1.6/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/typed_data-1.1.6/lib" />
             </list>
           </value>
         </entry>
         <entry key="vector_math">
           <value>
             <list>
-              <option value="$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/vector_math-2.0.8/lib" />
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/vector_math-2.0.8/lib" />
+            </list>
+          </value>
+        </entry>
+        <entry key="xml">
+          <value>
+            <list>
+              <option value="$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/xml-3.6.1/lib" />
             </list>
           </value>
         </entry>
       </option>
     </properties>
     <CLASSES>
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/async-2.1.0/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/boolean_selector-1.0.4/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/charcode-1.1.2/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/collection-1.14.11/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/cupertino_icons-0.1.2/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/matcher-0.12.5/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/meta-1.1.6/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/path-1.6.2/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/pedantic-1.5.0/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/quiver-2.0.2/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/source_span-1.5.5/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/stack_trace-1.9.3/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/stream_channel-2.0.0/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/string_scanner-1.0.4/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/term_glyph-1.1.0/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/test_api-0.2.4/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/typed_data-1.1.6/lib" />
-      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.flutter-io.cn/vector_math-2.0.8/lib" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/pkg/sky_engine/lib" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/packages/flutter/lib" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/packages/flutter_test/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/archive-2.0.13/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/args-1.6.0/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/async-2.4.1/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/boolean_selector-2.0.0/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/charcode-1.1.3/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/collection-1.14.12/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/convert-2.1.1/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/crypto-2.1.4/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/cupertino_icons-0.1.2/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/image-2.1.12/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/matcher-0.12.6/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/meta-1.1.8/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/nested-0.0.4/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/path-1.6.4/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/petitparser-2.4.0/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/provider-4.1.3/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/quiver-2.1.3/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/random_pk-0.0.3/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/source_span-1.7.0/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/stack_trace-1.9.3/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/stream_channel-2.0.0/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/string_scanner-1.0.5/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/term_glyph-1.1.0/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/test_api-0.2.15/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/typed_data-1.1.6/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/vector_math-2.0.8/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/.pub-cache/hosted/pub.flutter-io.cn/xml-3.6.1/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/pkg/sky_engine/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/packages/flutter/lib" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/packages/flutter_test/lib" />
     </CLASSES>
     <JAVADOC />
     <SOURCES />
diff --git a/.idea/libraries/Dart_SDK.xml b/.idea/libraries/Dart_SDK.xml
index abfd68a..e4dfdce 100644
--- a/.idea/libraries/Dart_SDK.xml
+++ b/.idea/libraries/Dart_SDK.xml
@@ -1,26 +1,27 @@
 <component name="libraryTable">
   <library name="Dart SDK">
     <CLASSES>
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/async" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/cli" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/collection" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/convert" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/core" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/developer" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/ffi" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/html" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/indexed_db" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/io" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/isolate" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/js" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/js_util" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/math" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/mirrors" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/svg" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/typed_data" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/web_audio" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/web_gl" />
-      <root url="file://$PROJECT_DIR$/../../FlutterSDK/flutter/bin/cache/dart-sdk/lib/web_sql" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/async" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/cli" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/collection" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/convert" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/core" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/developer" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/ffi" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/html" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/indexed_db" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/io" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/isolate" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/js" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/js_util" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/math" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/mirrors" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/svg" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/typed_data" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/wasm" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/web_audio" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/web_gl" />
+      <root url="file://$USER_HOME$/flutterSDK/flutter1.17-stable/bin/cache/dart-sdk/lib/web_sql" />
     </CLASSES>
     <JAVADOC />
     <SOURCES />
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index c6379b4..1b58360 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -1,23 +1,23 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="AndroidLayouts">
+    <shared>
+      <config />
+    </shared>
+  </component>
   <component name="ChangeListManager">
     <list default="true" id="18463f0e-cf10-4ee2-975b-376476396e12" name="Default Changelist" comment="">
-      <change afterPath="$PROJECT_DIR$/.idea/markdown-navigator.xml" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/.idea/markdown-navigator/profiles_settings.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/codeStyles/Project.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/vcs.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/flutter_custom_calendar.iml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/flutter_custom_calendar.iml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/libraries/Dart_Packages.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/libraries/Dart_Packages.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/libraries/Dart_SDK.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/libraries/Dart_SDK.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/README.md" beforeDir="false" afterPath="$PROJECT_DIR$/README.md" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/lib/base_day_view.dart" beforeDir="false" afterPath="$PROJECT_DIR$/lib/widget/base_day_view.dart" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/lib/base_week_bar.dart" beforeDir="false" afterPath="$PROJECT_DIR$/lib/widget/base_week_bar.dart" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/lib/calendar_view.dart" beforeDir="false" afterPath="$PROJECT_DIR$/lib/widget/calendar_view.dart" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/lib/controller.dart" beforeDir="false" afterPath="$PROJECT_DIR$/lib/controller.dart" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/lib/default_combine_day_view.dart" beforeDir="false" afterPath="$PROJECT_DIR$/lib/widget/default_combine_day_view.dart" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/lib/default_custom_day_view.dart" beforeDir="false" afterPath="$PROJECT_DIR$/lib/widget/default_custom_day_view.dart" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/lib/default_week_bar.dart" beforeDir="false" afterPath="$PROJECT_DIR$/lib/widget/default_week_bar.dart" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/lib/flutter_custom_calendar.dart" beforeDir="false" afterPath="$PROJECT_DIR$/lib/flutter_custom_calendar.dart" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/lib/month_view.dart" beforeDir="false" afterPath="$PROJECT_DIR$/lib/widget/month_view.dart" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/lib/month_view_pager.dart" beforeDir="false" afterPath="$PROJECT_DIR$/lib/widget/month_view_pager.dart" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/lib/week_view.dart" beforeDir="false" afterPath="$PROJECT_DIR$/lib/widget/week_view.dart" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/example/ios/Runner.xcodeproj/project.pbxproj" beforeDir="false" afterPath="$PROJECT_DIR$/example/ios/Runner.xcodeproj/project.pbxproj" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/example/pubspec.lock" beforeDir="false" afterPath="$PROJECT_DIR$/example/pubspec.lock" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/lib/constants/constants.dart" beforeDir="false" afterPath="$PROJECT_DIR$/lib/constants/constants.dart" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/lib/widget/month_view.dart" beforeDir="false" afterPath="$PROJECT_DIR$/lib/widget/month_view.dart" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/pubspec.lock" beforeDir="false" afterPath="$PROJECT_DIR$/pubspec.lock" afterDir="false" />
     </list>
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="SHOW_DIALOG" value="false" />
@@ -25,148 +25,18 @@
     <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
     <option name="LAST_RESOLUTION" value="IGNORE" />
   </component>
-  <component name="FileEditorManager">
-    <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
-      <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/README.md">
-          <provider selected="true" editor-type-id="split-provider[text-editor;MarkdownPreviewEditor]">
-            <state split_layout="SPLIT">
-              <first_editor relative-caret-position="1123">
-                <caret line="78" column="6" selection-start-line="78" selection-start-column="6" selection-end-line="78" selection-end-column="6" />
-              </first_editor>
-              <second_editor>
-                <markdownNavigatorState />
-              </second_editor>
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file pinned="false" current-in-tab="true">
-        <entry file="file://$PROJECT_DIR$/CHANGELOG.md">
-          <provider selected="true" editor-type-id="split-provider[text-editor;MarkdownPreviewEditor]">
-            <state split_layout="SPLIT">
-              <first_editor />
-              <second_editor>
-                <markdownNavigatorState />
-              </second_editor>
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/lib/flutter_custom_calendar.dart">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="34">
-              <caret line="2" column="50" selection-start-line="2" selection-start-column="50" selection-end-line="2" selection-end-column="50" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/lib/controller.dart">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="147">
-              <caret line="60" selection-start-line="60" selection-end-line="79" selection-end-column="55" />
-              <folding>
-                <element signature="e#0#39#0" expanded="true" />
-              </folding>
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/lib/widget/base_day_view.dart">
-          <provider selected="true" editor-type-id="text-editor">
-            <state>
-              <folding>
-                <element signature="e#0#39#0" expanded="true" />
-              </folding>
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/lib/widget/base_week_bar.dart">
-          <provider selected="true" editor-type-id="text-editor" />
-        </entry>
-      </file>
-    </leaf>
-  </component>
+  <component name="ExecutionTargetManager" SELECTED_TARGET="HMK7N17712003306" />
   <component name="Git.Settings">
     <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
   </component>
-  <component name="IdeDocumentHistory">
-    <option name="CHANGED_PATHS">
-      <list>
-        <option value="$PROJECT_DIR$/example/lib/progress_style_page.dart" />
-        <option value="$PROJECT_DIR$/example/lib/custom_style_page.dart" />
-        <option value="$PROJECT_DIR$/example/pubspec.yaml" />
-        <option value="$PROJECT_DIR$/example/lib/main.dart" />
-        <option value="$PROJECT_DIR$/lib/flutter_custom_calendar.dart" />
-        <option value="$PROJECT_DIR$/example/lib/default_style_page.dart" />
-        <option value="$PROJECT_DIR$/example/lib/multi_select_style_page.dart" />
-        <option value="$PROJECT_DIR$/lib/widget/calendar_view.dart" />
-        <option value="$PROJECT_DIR$/lib/widget/default_week_bar.dart" />
-        <option value="$PROJECT_DIR$/lib/widget/month_view.dart" />
-        <option value="$PROJECT_DIR$/lib/widget/month_view_pager.dart" />
-        <option value="$PROJECT_DIR$/README.md" />
-      </list>
-    </option>
-  </component>
-  <component name="ProjectFrameBounds">
-    <option name="y" value="23" />
-    <option name="width" value="1440" />
-    <option name="height" value="806" />
-  </component>
-  <component name="ProjectView">
-    <navigator currentView="ProjectPane" proportions="" version="1">
-      <foldersAlwaysOnTop value="true" />
-    </navigator>
-    <panes>
-      <pane id="Scope" />
-      <pane id="AndroidView" />
-      <pane id="ProjectPane">
-        <subPane>
-          <expand>
-            <path>
-              <item name="flutter_custom_calendar" type="b2602c69:ProjectViewProjectNode" />
-              <item name="flutter_custom_calendar" type="462c0819:PsiDirectoryNode" />
-            </path>
-            <path>
-              <item name="flutter_custom_calendar" type="b2602c69:ProjectViewProjectNode" />
-              <item name="flutter_custom_calendar" type="462c0819:PsiDirectoryNode" />
-              <item name="example" type="462c0819:PsiDirectoryNode" />
-            </path>
-            <path>
-              <item name="flutter_custom_calendar" type="b2602c69:ProjectViewProjectNode" />
-              <item name="flutter_custom_calendar" type="462c0819:PsiDirectoryNode" />
-              <item name="example" type="462c0819:PsiDirectoryNode" />
-              <item name="lib" type="462c0819:PsiDirectoryNode" />
-            </path>
-            <path>
-              <item name="flutter_custom_calendar" type="b2602c69:ProjectViewProjectNode" />
-              <item name="flutter_custom_calendar" type="462c0819:PsiDirectoryNode" />
-              <item name="lib" type="462c0819:PsiDirectoryNode" />
-            </path>
-            <path>
-              <item name="flutter_custom_calendar" type="b2602c69:ProjectViewProjectNode" />
-              <item name="flutter_custom_calendar" type="462c0819:PsiDirectoryNode" />
-              <item name="lib" type="462c0819:PsiDirectoryNode" />
-              <item name="widget" type="462c0819:PsiDirectoryNode" />
-            </path>
-          </expand>
-          <select />
-        </subPane>
-      </pane>
-      <pane id="PackagesPane" />
-    </panes>
-  </component>
+  <component name="ProjectId" id="1dLYXgUqXFRhtM2vVF7WEPgjPS2" />
   <component name="PropertiesComponent">
+    <property name="SHARE_PROJECT_CONFIGURATION_FILES" value="true" />
     <property name="android.sdk.path" value="$USER_HOME$/Library/Android/sdk" />
     <property name="dart.analysis.tool.window.force.activate" value="false" />
     <property name="io.flutter.reload.alreadyRun" value="true" />
     <property name="last_opened_file_path" value="$PROJECT_DIR$" />
-    <property name="settings.editor.selected.configurable" value="preferences.pluginManager" />
+    <property name="settings.editor.selected.configurable" value="flutter.settings" />
     <property name="show.migrate.to.gradle.popup" value="false" />
   </component>
   <component name="RecentsManager">
@@ -217,209 +87,17 @@
     </task>
     <servers />
   </component>
-  <component name="ToolWindowManager">
-    <frame x="0" y="23" width="1440" height="806" extended-state="0" />
-    <editor active="true" />
-    <layout>
-      <window_info id="Captures" order="0" side_tool="true" weight="0.25" />
-      <window_info active="true" content_ui="combo" id="Project" order="1" visible="true" weight="0.3040057" />
-      <window_info id="Structure" order="2" side_tool="true" />
-      <window_info id="Image Layers" order="3" />
-      <window_info id="Designer" order="4" />
-      <window_info id="Resources Explorer" order="5" />
-      <window_info id="Capture Tool" order="6" />
-      <window_info id="Favorites" order="7" side_tool="true" />
-      <window_info id="Build Variants" order="8" side_tool="true" />
-      <window_info anchor="bottom" id="Run" order="0" sideWeight="0.49928468" weight="0.32913166" />
-      <window_info anchor="bottom" id="TODO" order="1" />
-      <window_info anchor="bottom" id="Debug" order="2" />
-      <window_info anchor="bottom" id="Terminal" order="3" weight="0.32913166" />
-      <window_info anchor="bottom" id="Event Log" order="4" sideWeight="0.50143063" side_tool="true" weight="0.32913166" />
-      <window_info anchor="bottom" id="Flutter Performance" order="5" side_tool="true" />
-      <window_info anchor="bottom" id="Version Control" order="6" />
-      <window_info anchor="bottom" id="Dart Analysis" order="7" weight="0.32913166" />
-      <window_info anchor="bottom" id="Messages" order="8" sideWeight="0.49928468" weight="0.32913166" />
-      <window_info anchor="bottom" id="Logcat" order="9" />
-      <window_info anchor="bottom" id="Android Profiler" order="10" show_stripe_button="false" />
-      <window_info anchor="right" id="Capture Analysis" order="0" />
-      <window_info anchor="right" id="Theme Preview" order="1" />
-      <window_info anchor="right" id="Flutter Inspector" order="2" />
-      <window_info anchor="right" id="Flutter Outline" order="3" />
-      <window_info anchor="right" id="Palette&#9;" order="4" />
-      <window_info anchor="right" id="Device File Explorer" order="5" side_tool="true" />
-    </layout>
-  </component>
-  <component name="editorHistoryManager">
-    <entry file="file://$PROJECT_DIR$/pubspec.yaml">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="153">
-          <caret line="9" column="11" selection-start-line="9" selection-start-column="11" selection-end-line="9" selection-end-column="11" />
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/example/pubspec.yaml">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="235">
-          <caret line="31" column="13" selection-start-line="31" selection-start-column="13" selection-end-line="31" selection-end-column="13" />
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/example/lib/custom_style_page.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="17">
-          <caret line="1" column="70" selection-start-line="1" selection-end-line="2" />
-          <folding>
-            <element signature="e#0#39#0" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/example/lib/multi_select_style_page.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="170">
-          <caret line="10" column="1" selection-start-line="10" selection-start-column="1" selection-end-line="10" selection-end-column="1" />
-          <folding>
-            <element signature="e#0#39#0" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/example/lib/progress_style_page.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="17">
-          <caret line="1" column="39" selection-start-line="1" selection-start-column="16" selection-end-line="1" selection-end-column="39" />
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/example/lib/main.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="204">
-          <caret line="12" column="14" selection-start-line="12" selection-start-column="14" selection-end-line="12" selection-end-column="14" />
-          <folding>
-            <element signature="e#0#39#0" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/example/lib/default_style_page.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="17">
-          <caret line="1" column="44" selection-start-line="1" selection-end-line="2" />
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/lib/widget/calendar_view.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="238">
-          <caret line="15" column="13" lean-forward="true" selection-start-line="15" selection-start-column="13" selection-end-line="15" selection-end-column="13" />
-          <folding>
-            <element signature="e#0#39#0" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/lib/widget/default_combine_day_view.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state>
-          <folding>
-            <element signature="e#0#39#0" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/lib/widget/default_custom_day_view.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state>
-          <folding>
-            <element signature="e#0#39#0" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/lib/widget/default_week_bar.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="485">
-          <caret line="49" column="12" selection-start-line="49" selection-start-column="12" selection-end-line="49" selection-end-column="12" />
-          <folding>
-            <element signature="e#0#39#0" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/lib/widget/base_day_view.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state>
-          <folding>
-            <element signature="e#0#39#0" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/lib/widget/base_week_bar.dart">
-      <provider selected="true" editor-type-id="text-editor" />
-    </entry>
-    <entry file="file://$PROJECT_DIR$/lib/widget/month_view.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="51">
-          <caret line="3" selection-start-line="3" selection-end-line="3" />
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/lib/widget/month_view_pager.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="34">
-          <caret line="2" selection-start-line="2" selection-end-line="2" />
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/lib/widget/week_view.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state>
-          <folding>
-            <element signature="e#0#39#0" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/lib/flutter_custom_calendar.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="34">
-          <caret line="2" column="50" selection-start-line="2" selection-start-column="50" selection-end-line="2" selection-end-column="50" />
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/lib/controller.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="147">
-          <caret line="60" selection-start-line="60" selection-end-line="79" selection-end-column="55" />
-          <folding>
-            <element signature="e#0#39#0" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/README.md">
-      <provider selected="true" editor-type-id="split-provider[text-editor;MarkdownPreviewEditor]">
-        <state split_layout="SPLIT">
-          <first_editor relative-caret-position="1123">
-            <caret line="78" column="6" selection-start-line="78" selection-start-column="6" selection-end-line="78" selection-end-column="6" />
-          </first_editor>
-          <second_editor>
-            <markdownNavigatorState />
-          </second_editor>
-        </state>
-      </provider>
-      <provider editor-type-id="text-editor" />
-    </entry>
-    <entry file="file://$PROJECT_DIR$/CHANGELOG.md">
-      <provider selected="true" editor-type-id="split-provider[text-editor;MarkdownPreviewEditor]">
-        <state split_layout="SPLIT">
-          <first_editor />
-          <second_editor>
-            <markdownNavigatorState />
-          </second_editor>
-        </state>
-      </provider>
-    </entry>
+  <component name="Vcs.Log.Tabs.Properties">
+    <option name="TAB_STATES">
+      <map>
+        <entry key="MAIN">
+          <value>
+            <State>
+              <option name="COLUMN_ORDER" />
+            </State>
+          </value>
+        </entry>
+      </map>
+    </option>
   </component>
 </project>
\ No newline at end of file
diff --git a/example/ios/Runner.xcodeproj/project.pbxproj b/example/ios/Runner.xcodeproj/project.pbxproj
index 23d3283..07bc788 100644
--- a/example/ios/Runner.xcodeproj/project.pbxproj
+++ b/example/ios/Runner.xcodeproj/project.pbxproj
@@ -9,11 +9,7 @@
 /* Begin PBXBuildFile section */
 		1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */ = {isa = PBXBuildFile; fileRef = 1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */; };
 		3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */; };
-		3B80C3941E831B6300D905FE /* App.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 3B80C3931E831B6300D905FE /* App.framework */; };
-		3B80C3951E831B6300D905FE /* App.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 3B80C3931E831B6300D905FE /* App.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		74858FAF1ED2DC5600515810 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 74858FAE1ED2DC5600515810 /* AppDelegate.swift */; };
-		9705A1C61CF904A100538489 /* Flutter.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 9740EEBA1CF902C7004384FC /* Flutter.framework */; };
-		9705A1C71CF904A300538489 /* Flutter.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 9740EEBA1CF902C7004384FC /* Flutter.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		97C146FC1CF9000F007C117D /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FA1CF9000F007C117D /* Main.storyboard */; };
 		97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FD1CF9000F007C117D /* Assets.xcassets */; };
 		97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */; };
@@ -26,8 +22,6 @@
 			dstPath = "";
 			dstSubfolderSpec = 10;
 			files = (
-				3B80C3951E831B6300D905FE /* App.framework in Embed Frameworks */,
-				9705A1C71CF904A300538489 /* Flutter.framework in Embed Frameworks */,
 			);
 			name = "Embed Frameworks";
 			runOnlyForDeploymentPostprocessing = 0;
@@ -38,13 +32,11 @@
 		1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
 		1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = "<group>"; };
 		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
-		3B80C3931E831B6300D905FE /* App.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = App.framework; path = Flutter/App.framework; sourceTree = "<group>"; };
 		74858FAD1ED2DC5600515810 /* Runner-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "Runner-Bridging-Header.h"; sourceTree = "<group>"; };
 		74858FAE1ED2DC5600515810 /* AppDelegate.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		7AFA3C8E1D35360C0083082E /* Release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = Release.xcconfig; path = Flutter/Release.xcconfig; sourceTree = "<group>"; };
 		9740EEB21CF90195004384FC /* Debug.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Debug.xcconfig; path = Flutter/Debug.xcconfig; sourceTree = "<group>"; };
 		9740EEB31CF90195004384FC /* Generated.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Generated.xcconfig; path = Flutter/Generated.xcconfig; sourceTree = "<group>"; };
-		9740EEBA1CF902C7004384FC /* Flutter.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Flutter.framework; path = Flutter/Flutter.framework; sourceTree = "<group>"; };
 		97C146EE1CF9000F007C117D /* Runner.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Runner.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		97C146FB1CF9000F007C117D /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
 		97C146FD1CF9000F007C117D /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
@@ -57,8 +49,6 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				9705A1C61CF904A100538489 /* Flutter.framework in Frameworks */,
-				3B80C3941E831B6300D905FE /* App.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -68,9 +58,7 @@
 		9740EEB11CF90186004384FC /* Flutter */ = {
 			isa = PBXGroup;
 			children = (
-				3B80C3931E831B6300D905FE /* App.framework */,
 				3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */,
-				9740EEBA1CF902C7004384FC /* Flutter.framework */,
 				9740EEB21CF90195004384FC /* Debug.xcconfig */,
 				7AFA3C8E1D35360C0083082E /* Release.xcconfig */,
 				9740EEB31CF90195004384FC /* Generated.xcconfig */,
@@ -201,7 +189,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" thin";
+			shellScript = "/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" embed_and_thin";
 		};
 		9740EEB61CF901F6004384FC /* Run Script */ = {
 			isa = PBXShellScriptBuildPhase;
diff --git a/example/pubspec.lock b/example/pubspec.lock
index 681846d..ddf3787 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -7,42 +7,42 @@ packages:
       name: archive
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.10"
+    version: "2.0.13"
   args:
     dependency: transitive
     description:
       name: args
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.5.2"
+    version: "1.6.0"
   async:
     dependency: transitive
     description:
       name: async
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.3.0"
+    version: "2.4.1"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.0.5"
+    version: "2.0.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.2"
+    version: "1.1.3"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.14.11"
+    version: "1.14.12"
   convert:
     dependency: transitive
     description:
@@ -56,7 +56,7 @@ packages:
       name: crypto
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.1.3"
+    version: "2.1.4"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -87,35 +87,35 @@ packages:
       name: image
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.1.4"
+    version: "2.1.12"
   matcher:
     dependency: transitive
     description:
       name: matcher
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.12.5"
+    version: "0.12.6"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.7"
-  path:
+    version: "1.1.8"
+  nested:
     dependency: transitive
     description:
-      name: path
+      name: nested
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.6.4"
-  pedantic:
+    version: "0.0.4"
+  path:
     dependency: transitive
     description:
-      name: pedantic
+      name: path
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.8.0+1"
+    version: "1.6.4"
   petitparser:
     dependency: transitive
     description:
@@ -129,14 +129,14 @@ packages:
       name: provider
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "3.1.0+1"
+    version: "4.1.3"
   quiver:
     dependency: transitive
     description:
       name: quiver
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.5"
+    version: "2.1.3"
   random_pk:
     dependency: "direct main"
     description:
@@ -155,7 +155,7 @@ packages:
       name: source_span
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.5.5"
+    version: "1.7.0"
   stack_trace:
     dependency: transitive
     description:
@@ -190,7 +190,7 @@ packages:
       name: test_api
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.2.5"
+    version: "0.2.15"
   typed_data:
     dependency: transitive
     description:
@@ -211,6 +211,7 @@ packages:
       name: xml
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "3.5.0"
+    version: "3.6.1"
 sdks:
-  dart: ">=2.4.0 <3.0.0"
+  dart: ">=2.7.0 <3.0.0"
+  flutter: ">=1.16.0"
diff --git a/lib/constants/constants.dart b/lib/constants/constants.dart
index 2917567..fe0b86d 100644
--- a/lib/constants/constants.dart
+++ b/lib/constants/constants.dart
@@ -1,15 +1,21 @@
 class CalendarConstants {
-
   //单选或者多选模式
+  // 单选
   static const int MODE_SINGLE_SELECT = 1;
+
+  /// 多选
+
   static const int MODE_MULTI_SELECT = 2;
 
-  //展示模式
-  static const int MODE_SHOW_ONLY_MONTH=1;//仅支持月视图
-  static const int MODE_SHOW_ONLY_WEEK=2;//仅支持星期视图
-  static const int MODE_SHOW_WEEK_AND_MONTH=3;//支持两种视图，先显示周视图
-  static const int MODE_SHOW_MONTH_AND_WEEK=4;//支持两种视图，先显示月视图
+  /// 选择开始和结束 中间的自动选择
+
+  static const int MODE_MULTI_SELECT_FROM_TO_END = 3;
 
+  //展示模式
+  static const int MODE_SHOW_ONLY_MONTH = 1; //仅支持月视图
+  static const int MODE_SHOW_ONLY_WEEK = 2; //仅支持星期视图
+  static const int MODE_SHOW_WEEK_AND_MONTH = 3; //支持两种视图，先显示周视图
+  static const int MODE_SHOW_MONTH_AND_WEEK = 4; //支持两种视图，先显示月视图
 
   /**
    * 一周七天
diff --git a/lib/widget/month_view.dart b/lib/widget/month_view.dart
index 0eb5643..b08dc79 100644
--- a/lib/widget/month_view.dart
+++ b/lib/widget/month_view.dart
@@ -55,7 +55,8 @@ class _MonthViewState extends State<MonthView>
       });
     }
 
-    lineCount = DateUtil.getMonthViewLineCount(widget.year, widget.month, widget.configuration.offset);
+    lineCount = DateUtil.getMonthViewLineCount(
+        widget.year, widget.month, widget.configuration.offset);
 
     //第一帧后,添加监听，generation发生变化后，需要刷新整个日历
     WidgetsBinding.instance.addPostFrameCallback((callback) {
@@ -109,18 +110,35 @@ class _MonthViewState extends State<MonthView>
         itemBuilder: (context, index) {
           DateModel dateModel = items[index];
           //判断是否被选择
-          if (configuration.selectMode == CalendarConstants.MODE_MULTI_SELECT) {
-            if (calendarProvider.selectedDateList.contains(dateModel)) {
-              dateModel.isSelected = true;
-            } else {
-              dateModel.isSelected = false;
-            }
-          } else {
-            if (calendarProvider.selectDateModel == dateModel) {
-              dateModel.isSelected = true;
-            } else {
-              dateModel.isSelected = false;
-            }
+          switch (configuration.selectMode) {
+
+            /// 多选
+            case CalendarConstants.MODE_MULTI_SELECT:
+              if (calendarProvider.selectedDateList.contains(dateModel)) {
+                dateModel.isSelected = true;
+              } else {
+                dateModel.isSelected = false;
+              }
+              break;
+
+            /// 选择开始和结束 中间的自动选择
+
+            case CalendarConstants.MODE_MULTI_SELECT_FROM_TO_END:
+              if (calendarProvider.selectedDateList.contains(dateModel)) {
+                dateModel.isSelected = true;
+              } else {
+                dateModel.isSelected = false;
+              }
+              break;
+
+            /// 单选
+            case CalendarConstants.MODE_SINGLE_SELECT:
+              if (calendarProvider.selectDateModel == dateModel) {
+                dateModel.isSelected = true;
+              } else {
+                dateModel.isSelected = false;
+              }
+              break;
           }
 
           return ItemContainer(
@@ -214,38 +232,75 @@ class ItemContainerState extends State<ItemContainer> {
 
         calendarProvider.lastClickDateModel = dateModel;
 
-        if (configuration.selectMode == CalendarConstants.MODE_MULTI_SELECT) {
-          if (calendarProvider.selectedDateList.contains(dateModel)) {
-            calendarProvider.selectedDateList.remove(dateModel);
-          } else {
-            //多选，判断是否超过限制，超过范围
-            if (calendarProvider.selectedDateList.length ==
-                configuration.maxMultiSelectCount) {
-              if (configuration.multiSelectOutOfSize != null) {
-                configuration.multiSelectOutOfSize();
+        switch (configuration.selectMode) {
+          //简单多选
+          case CalendarConstants.MODE_MULTI_SELECT:
+            if (calendarProvider.selectedDateList.contains(dateModel)) {
+              calendarProvider.selectedDateList.remove(dateModel);
+            } else {
+              //多选，判断是否超过限制，超过范围
+              if (calendarProvider.selectedDateList.length ==
+                  configuration.maxMultiSelectCount) {
+                if (configuration.multiSelectOutOfSize != null) {
+                  configuration.multiSelectOutOfSize();
+                }
+                return;
               }
-              return;
+              calendarProvider.selectedDateList.add(dateModel);
+            }
+            if (configuration.calendarSelect != null) {
+              configuration.calendarSelect(dateModel);
             }
-            calendarProvider.selectedDateList.add(dateModel);
-          }
-          if (configuration.calendarSelect != null) {
-            configuration.calendarSelect(dateModel);
-          }
 
-          //多选也可以弄这些单选的代码
-          calendarProvider.selectDateModel = dateModel;
-        } else {
-          calendarProvider.selectDateModel = dateModel;
-          if (configuration.calendarSelect != null) {
-            configuration.calendarSelect(dateModel);
-          }
+            //多选也可以弄这些单选的代码
+            calendarProvider.selectDateModel = dateModel;
+            break;
 
-          //单选需要刷新上一个item
-          if (calendarProvider.lastClickItemState != this) {
-            calendarProvider.lastClickItemState?.refreshItem(false);
-            calendarProvider.lastClickItemState = this;
-          }
+          /// 单选
+          case CalendarConstants.MODE_SINGLE_SELECT:
+            calendarProvider.selectDateModel = dateModel;
+            if (configuration.calendarSelect != null) {
+              configuration.calendarSelect(dateModel);
+            }
+
+            //单选需要刷新上一个item
+            if (calendarProvider.lastClickItemState != this) {
+              calendarProvider.lastClickItemState?.refreshItem(false);
+              calendarProvider.lastClickItemState = this;
+            }
+            break;
+
+          /// 选择范围
+          case CalendarConstants.MODE_MULTI_SELECT_FROM_TO_END:
+            if (calendarProvider.selectedDateList.length == 0) {
+              calendarProvider.selectedDateList.add(dateModel);
+            } else if (calendarProvider.selectedDateList.length == 1) {
+              DateModel d2 = calendarProvider.selectedDateList.last;
+              DateTime t1, t2;
+              if (d2.getDateTime().isAfter(dateModel.getDateTime())) {
+                t2 = d2.getDateTime();
+                t1 = dateModel.getDateTime();
+              } else {
+                t1 = d2.getDateTime();
+                t2 = dateModel.getDateTime();
+              }
+              for (; t1.isBefore(t2);) {
+                calendarProvider.selectedDateList
+                    .add(DateModel.fromDateTime(t1));
+                t1 = t1.add(Duration(days: 1));
+              }
+            } else {
+              /// 加入已经选择了多个 则进行取消操作
+              calendarProvider.selectedDateList.clear();
+            }
+            if (configuration.calendarSelect != null) {
+              calendarProvider.selectedDateList.forEach((element) {
+                configuration.calendarSelect(element);
+              });
+            }
+            break;
         }
+
         refreshItem(!this.dateModel.isSelected);
       },
       child: configuration.dayWidgetBuilder(dateModel),
diff --git a/pubspec.lock b/pubspec.lock
index 406ab5f..327bd98 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -7,42 +7,42 @@ packages:
       name: archive
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.10"
+    version: "2.0.13"
   args:
     dependency: transitive
     description:
       name: args
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.5.2"
+    version: "1.6.0"
   async:
     dependency: transitive
     description:
       name: async
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.3.0"
+    version: "2.4.1"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.0.5"
+    version: "2.0.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.2"
+    version: "1.1.3"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.14.11"
+    version: "1.14.12"
   convert:
     dependency: transitive
     description:
@@ -56,7 +56,7 @@ packages:
       name: crypto
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.1.3"
+    version: "2.1.4"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -73,35 +73,35 @@ packages:
       name: image
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.1.4"
+    version: "2.1.12"
   matcher:
     dependency: transitive
     description:
       name: matcher
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.12.5"
+    version: "0.12.6"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.7"
-  path:
+    version: "1.1.8"
+  nested:
     dependency: transitive
     description:
-      name: path
+      name: nested
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.6.4"
-  pedantic:
+    version: "0.0.4"
+  path:
     dependency: transitive
     description:
-      name: pedantic
+      name: path
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.8.0+1"
+    version: "1.6.4"
   petitparser:
     dependency: transitive
     description:
@@ -115,14 +115,14 @@ packages:
       name: provider
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "3.1.0+1"
+    version: "4.1.3"
   quiver:
     dependency: transitive
     description:
       name: quiver
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.5"
+    version: "2.1.3"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -134,7 +134,7 @@ packages:
       name: source_span
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.5.5"
+    version: "1.7.0"
   stack_trace:
     dependency: transitive
     description:
@@ -169,7 +169,7 @@ packages:
       name: test_api
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.2.5"
+    version: "0.2.15"
   typed_data:
     dependency: transitive
     description:
@@ -190,6 +190,7 @@ packages:
       name: xml
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "3.5.0"
+    version: "3.6.1"
 sdks:
-  dart: ">=2.4.0 <3.0.0"
+  dart: ">=2.7.0 <3.0.0"
+  flutter: ">=1.16.0"