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99 lines
3.3 KiB
99 lines
3.3 KiB
4 years ago
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#ifndef RUNNER_WIN32_WINDOW_H_
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#define RUNNER_WIN32_WINDOW_H_
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#include <windows.h>
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#include <functional>
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#include <memory>
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#include <string>
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// A class abstraction for a high DPI-aware Win32 Window. Intended to be
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// inherited from by classes that wish to specialize with custom
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// rendering and input handling
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class Win32Window {
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public:
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struct Point {
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unsigned int x;
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unsigned int y;
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Point(unsigned int x, unsigned int y) : x(x), y(y) {}
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};
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struct Size {
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unsigned int width;
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unsigned int height;
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Size(unsigned int width, unsigned int height)
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: width(width), height(height) {}
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};
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Win32Window();
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virtual ~Win32Window();
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// Creates and shows a win32 window with |title| and position and size using
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// |origin| and |size|. New windows are created on the default monitor. Window
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// sizes are specified to the OS in physical pixels, hence to ensure a
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// consistent size to will treat the width height passed in to this function
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// as logical pixels and scale to appropriate for the default monitor. Returns
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// true if the window was created successfully.
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bool CreateAndShow(const std::wstring& title,
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const Point& origin,
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const Size& size);
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// Release OS resources associated with window.
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void Destroy();
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// Inserts |content| into the window tree.
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void SetChildContent(HWND content);
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// Returns the backing Window handle to enable clients to set icon and other
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// window properties. Returns nullptr if the window has been destroyed.
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HWND GetHandle();
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// If true, closing this window will quit the application.
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void SetQuitOnClose(bool quit_on_close);
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// Return a RECT representing the bounds of the current client area.
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RECT GetClientArea();
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protected:
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// Processes and route salient window messages for mouse handling,
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// size change and DPI. Delegates handling of these to member overloads that
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// inheriting classes can handle.
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virtual LRESULT MessageHandler(HWND window,
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UINT const message,
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WPARAM const wparam,
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LPARAM const lparam) noexcept;
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// Called when CreateAndShow is called, allowing subclass window-related
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// setup. Subclasses should return false if setup fails.
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virtual bool OnCreate();
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// Called when Destroy is called.
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virtual void OnDestroy();
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private:
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friend class WindowClassRegistrar;
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// OS callback called by message pump. Handles the WM_NCCREATE message which
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// is passed when the non-client area is being created and enables automatic
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// non-client DPI scaling so that the non-client area automatically
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// responsponds to changes in DPI. All other messages are handled by
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// MessageHandler.
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static LRESULT CALLBACK WndProc(HWND const window,
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UINT const message,
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WPARAM const wparam,
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LPARAM const lparam) noexcept;
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// Retrieves a class instance pointer for |window|
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static Win32Window* GetThisFromHandle(HWND const window) noexcept;
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bool quit_on_close_ = false;
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// window handle for top level window.
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HWND window_handle_ = nullptr;
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// window handle for hosted content.
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HWND child_content_ = nullptr;
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};
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#endif // RUNNER_WIN32_WINDOW_H_
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