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1 files changed, 70 insertions, 0 deletions

diff --git a/include/cru/platform/gui/UiApplication.h b/include/cru/platform/gui/UiApplication.h
new file mode 100644
index 00000000..b39e2d36
--- /dev/null
+++ b/include/cru/platform/gui/UiApplication.h
@@ -0,0 +1,70 @@
+#pragma once
+#include "Base.h"
+
+#include "cru/common/Bitmask.h"
+#include "cru/platform/gui/Menu.h"
+
+#include "SaveOpenDialogOptions.h"
+
+#include <chrono>
+#include <functional>
+#include <memory>
+#include <vector>
+
+namespace cru::platform::gui {
+// The entry point of a ui application.
+struct CRU_PLATFORM_GUI_API IUiApplication : public virtual IPlatformResource {
+ public:
+  static IUiApplication* GetInstance() { return instance; }
+
+ private:
+  static IUiApplication* instance;
+
+ protected:
+  IUiApplication();
+
+ public:
+  ~IUiApplication() override;
+
+  // Block current thread and run the message loop. Return the exit code when
+  // message loop gets a quit message (possibly posted by method RequestQuit).
+  virtual int Run() = 0;
+
+  // Post a quit message with given quit code.
+  virtual void RequestQuit(int quit_code) = 0;
+
+  virtual void AddOnQuitHandler(std::function<void()> handler) = 0;
+
+  virtual bool IsQuitOnAllWindowClosed() = 0;
+  virtual void SetQuitOnAllWindowClosed(bool quit_on_all_window_closed) = 0;
+
+  // Timer id should always be positive (not 0) and never the same. So it's ok
+  // to use negative value (or 0) to represent no timer.
+  virtual long long SetImmediate(std::function<void()> action) = 0;
+  virtual long long SetTimeout(std::chrono::milliseconds milliseconds,
+                               std::function<void()> action) = 0;
+  virtual long long SetInterval(std::chrono::milliseconds milliseconds,
+                                std::function<void()> action) = 0;
+  // Implementation should guarantee calls on timer id already canceled have no
+  // effects and do not crash. Also canceling negative id or 0 should always
+  // result in no-op.
+  virtual void CancelTimer(long long id) = 0;
+
+  virtual std::vector<INativeWindow*> GetAllWindow() = 0;
+
+  virtual INativeWindow* CreateWindow() = 0;
+
+  virtual cru::platform::graphics::IGraphicsFactory* GetGraphicsFactory() = 0;
+
+  virtual ICursorManager* GetCursorManager() = 0;
+
+  virtual IClipboard* GetClipboard() = 0;
+
+  // If return nullptr, it means the menu is not supported.
+  virtual IMenu* GetApplicationMenu();
+
+  virtual std::optional<String> ShowSaveDialog(SaveDialogOptions options);
+  virtual std::optional<std::vector<String>> ShowOpenDialog(
+      OpenDialogOptions options);
+};
+}  // namespace cru::platform::gui