1 files changed, 109 insertions, 0 deletions
diff --git a/include/cru/platform/gui/UiApplication.hpp b/include/cru/platform/gui/UiApplication.hpp
new file mode 100644
index 00000000..6a2eb067
--- /dev/null
+++ b/include/cru/platform/gui/UiApplication.hpp
@@ -0,0 +1,109 @@
+#pragma once
+#include "Base.hpp"
+
+#include <chrono>
+#include <functional>
+#include <memory>
+#include <vector>
+
+namespace cru::platform::gui {
+// The entry point of a ui application.
+struct IUiApplication : public virtual INativeResource {
+ 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;
+
+  // 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(INativeWindow* parent) = 0;
+
+  virtual cru::platform::graphics::IGraphFactory* GetGraphFactory() = 0;
+
+  virtual ICursorManager* GetCursorManager() = 0;
+};
+
+class TimerAutoCanceler {
+ public:
+  TimerAutoCanceler() : id_(0) {}
+  explicit TimerAutoCanceler(long long id) : id_(id) {}
+
+  CRU_DELETE_COPY(TimerAutoCanceler)
+
+  TimerAutoCanceler(TimerAutoCanceler&& other) : id_(other.id_) {
+    other.id_ = 0;
+  }
+
+  TimerAutoCanceler& operator=(TimerAutoCanceler&& other) {
+    Reset(other.id_);
+    other.id_ = 0;
+    return *this;
+  }
+
+  ~TimerAutoCanceler() { Reset(); }
+
+  long long Release() {
+    auto temp = id_;
+    id_ = 0;
+    return temp;
+  }
+
+  void Reset(long long id = 0) {
+    if (id_ > 0) IUiApplication::GetInstance()->CancelTimer(id_);
+    id_ = id;
+  }
+
+ private:
+  long long id_;
+};
+
+class TimerListAutoCanceler {
+ public:
+  TimerListAutoCanceler() = default;
+  CRU_DELETE_COPY(TimerListAutoCanceler)
+  CRU_DEFAULT_MOVE(TimerListAutoCanceler)
+  ~TimerListAutoCanceler() = default;
+
+  TimerListAutoCanceler& operator+=(long long id) {
+    list_.push_back(TimerAutoCanceler(id));
+    return *this;
+  }
+
+  void Clear() { list_.clear(); }
+
+  bool IsEmpty() const { return list_.empty(); }
+
+ private:
+  std::vector<TimerAutoCanceler> list_;
+};
+
+// Bootstrap from this.
+std::unique_ptr<IUiApplication> CreateUiApplication();
+}  // namespace cru::platform::gui