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6 files changed, 552 insertions, 0 deletions

diff --git a/include/cru/ui/event/ui_event.hpp b/include/cru/ui/event/ui_event.hpp
new file mode 100644
index 00000000..ba8940cb
--- /dev/null
+++ b/include/cru/ui/event/ui_event.hpp
@@ -0,0 +1,200 @@
+#pragma once
+#include "cru/common/base.hpp"
+
+#include "cru/common/event.hpp"
+#include "cru/common/ui_base.hpp"
+#include "cru/platform/basic_types.hpp"
+
+#include <optional>
+
+namespace cru::platform {
+struct Painter;
+}
+
+namespace cru::ui {
+class Control;
+}
+
+namespace cru::ui::event {
+class UiEventArgs : public Object {
+ public:
+  UiEventArgs(Object* sender, Object* original_sender)
+      : sender_(sender),
+        original_sender_(original_sender),
+        handled_(false) {}
+
+  UiEventArgs(const UiEventArgs& other) = default;
+  UiEventArgs(UiEventArgs&& other) = default;
+  UiEventArgs& operator=(const UiEventArgs& other) = default;
+  UiEventArgs& operator=(UiEventArgs&& other) = default;
+  ~UiEventArgs() override = default;
+
+  Object* GetOriginalSender() const { return original_sender_; }
+
+  bool IsHandled() const { return handled_; }
+  void SetHandled(const bool handled = true) { handled_ = handled; }
+
+ private:
+  Object* sender_;
+  Object* original_sender_;
+  bool handled_;
+};
+
+template <typename TEventArgs>
+class RoutedEvent {
+ public:
+  static_assert(std::is_base_of_v<UiEventArgs, TEventArgs>,
+                "TEventArgs must be subclass of UiEventArgs.");
+
+  using EventArgs = TEventArgs;
+
+  RoutedEvent() = default;
+  RoutedEvent(const RoutedEvent& other) = delete;
+  RoutedEvent(RoutedEvent&& other) = delete;
+  RoutedEvent& operator=(const RoutedEvent& other) = delete;
+  RoutedEvent& operator=(RoutedEvent&& other) = delete;
+  ~RoutedEvent() = default;
+
+  Event<TEventArgs> direct;
+  Event<TEventArgs> bubble;
+  Event<TEventArgs> tunnel;
+};
+
+class MouseEventArgs : public UiEventArgs {
+ public:
+  MouseEventArgs(Object* sender, Object* original_sender,
+                 const std::optional<Point>& point = std::nullopt)
+      : UiEventArgs(sender, original_sender), point_(point) {}
+  MouseEventArgs(const MouseEventArgs& other) = default;
+  MouseEventArgs(MouseEventArgs&& other) = default;
+  MouseEventArgs& operator=(const MouseEventArgs& other) = default;
+  MouseEventArgs& operator=(MouseEventArgs&& other) = default;
+  ~MouseEventArgs() override = default;
+
+  Point GetPoint() const { return point_.value_or(Point{}); }
+
+ private:
+  std::optional<Point> point_;
+};
+
+class MouseButtonEventArgs : public MouseEventArgs {
+ public:
+  MouseButtonEventArgs(Object* sender, Object* original_sender,
+                       const Point& point, const platform::MouseButton button)
+      : MouseEventArgs(sender, original_sender, point), button_(button) {}
+  MouseButtonEventArgs(const MouseButtonEventArgs& other) = default;
+  MouseButtonEventArgs(MouseButtonEventArgs&& other) = default;
+  MouseButtonEventArgs& operator=(const MouseButtonEventArgs& other) = default;
+  MouseButtonEventArgs& operator=(MouseButtonEventArgs&& other) = default;
+  ~MouseButtonEventArgs() override = default;
+
+  platform::MouseButton GetMouseButton() const { return button_; }
+
+ private:
+  platform::MouseButton button_;
+};
+
+class MouseWheelEventArgs : public MouseEventArgs {
+ public:
+  MouseWheelEventArgs(Object* sender, Object* original_sender,
+                      const Point& point, const float delta)
+      : MouseEventArgs(sender, original_sender, point), delta_(delta) {}
+  MouseWheelEventArgs(const MouseWheelEventArgs& other) = default;
+  MouseWheelEventArgs(MouseWheelEventArgs&& other) = default;
+  MouseWheelEventArgs& operator=(const MouseWheelEventArgs& other) = default;
+  MouseWheelEventArgs& operator=(MouseWheelEventArgs&& other) = default;
+  ~MouseWheelEventArgs() override = default;
+
+  float GetDelta() const { return delta_; }
+
+ private:
+  float delta_;
+};
+
+class PaintEventArgs : public UiEventArgs {
+ public:
+  PaintEventArgs(Object* sender, Object* original_sender,
+                platform::Painter* painter)
+      : UiEventArgs(sender, original_sender), painter_(painter) {}
+  PaintEventArgs(const PaintEventArgs& other) = default;
+  PaintEventArgs(PaintEventArgs&& other) = default;
+  PaintEventArgs& operator=(const PaintEventArgs& other) = default;
+  PaintEventArgs& operator=(PaintEventArgs&& other) = default;
+  ~PaintEventArgs() = default;
+
+  platform::Painter* GetPainter() const { return painter_; }
+
+ private:
+  platform::Painter* painter_;
+};
+
+class FocusChangeEventArgs : public UiEventArgs {
+ public:
+  FocusChangeEventArgs(Object* sender, Object* original_sender,
+                       const bool is_window = false)
+      : UiEventArgs(sender, original_sender), is_window_(is_window) {}
+  FocusChangeEventArgs(const FocusChangeEventArgs& other) = default;
+  FocusChangeEventArgs(FocusChangeEventArgs&& other) = default;
+  FocusChangeEventArgs& operator=(const FocusChangeEventArgs& other) = default;
+  FocusChangeEventArgs& operator=(FocusChangeEventArgs&& other) = default;
+  ~FocusChangeEventArgs() override = default;
+
+  // Return whether the focus change is caused by the window-wide focus change.
+  bool IsWindow() const { return is_window_; }
+
+ private:
+  bool is_window_;
+};
+
+/*
+class ToggleEventArgs : public UiEventArgs {
+ public:
+  ToggleEventArgs(Object* sender, Object* original_sender, bool new_state)
+      : UiEventArgs(sender, original_sender), new_state_(new_state) {}
+  ToggleEventArgs(const ToggleEventArgs& other) = default;
+  ToggleEventArgs(ToggleEventArgs&& other) = default;
+  ToggleEventArgs& operator=(const ToggleEventArgs& other) = default;
+  ToggleEventArgs& operator=(ToggleEventArgs&& other) = default;
+  ~ToggleEventArgs() override = default;
+
+  bool GetNewState() const { return new_state_; }
+
+ private:
+  bool new_state_;
+};
+*/
+
+class KeyEventArgs : public UiEventArgs {
+ public:
+  KeyEventArgs(Object* sender, Object* original_sender, int virtual_code)
+      : UiEventArgs(sender, original_sender), virtual_code_(virtual_code) {}
+  KeyEventArgs(const KeyEventArgs& other) = default;
+  KeyEventArgs(KeyEventArgs&& other) = default;
+  KeyEventArgs& operator=(const KeyEventArgs& other) = default;
+  KeyEventArgs& operator=(KeyEventArgs&& other) = default;
+  ~KeyEventArgs() override = default;
+
+  int GetVirtualCode() const { return virtual_code_; }
+
+ private:
+  int virtual_code_;
+};
+
+/*
+class CharEventArgs : public UiEventArgs {
+ public:
+  CharEventArgs(Object* sender, Object* original_sender, wchar_t c)
+      : UiEventArgs(sender, original_sender), c_(c) {}
+  CharEventArgs(const CharEventArgs& other) = default;
+  CharEventArgs(CharEventArgs&& other) = default;
+  CharEventArgs& operator=(const CharEventArgs& other) = default;
+  CharEventArgs& operator=(CharEventArgs&& other) = default;
+  ~CharEventArgs() override = default;
+
+  wchar_t GetChar() const { return c_; }
+
+ private:
+  wchar_t c_;
+};
+*/
+}  // namespace cru::ui::events
diff --git a/include/cru/ui/render/border_render_object.hpp b/include/cru/ui/render/border_render_object.hpp
new file mode 100644
index 00000000..a96ccf99
--- /dev/null
+++ b/include/cru/ui/render/border_render_object.hpp
@@ -0,0 +1,88 @@
+#pragma once
+#include "render_object.hpp"
+
+namespace cru::platform {
+struct Brush;
+}
+
+namespace cru::ui::render {
+struct CornerRadius {
+  constexpr CornerRadius()
+      : left_top(), right_top(), left_bottom(), right_bottom() {}
+  constexpr CornerRadius(const Point& value)
+      : left_top(value),
+        right_top(value),
+        left_bottom(value),
+        right_bottom(value) {}
+  constexpr CornerRadius(Point left_top, Point right_top, Point left_bottom,
+                         Point right_bottom)
+      : left_top(left_top),
+        right_top(right_top),
+        left_bottom(left_bottom),
+        right_bottom(right_bottom) {}
+
+  Point left_top;
+  Point right_top;
+  Point left_bottom;
+  Point right_bottom;
+};
+
+class BorderRenderObject : public RenderObject {
+ public:
+  explicit BorderRenderObject(platform::Brush* brush);
+  BorderRenderObject(const BorderRenderObject& other) = delete;
+  BorderRenderObject(BorderRenderObject&& other) = delete;
+  BorderRenderObject& operator=(const BorderRenderObject& other) = delete;
+  BorderRenderObject& operator=(BorderRenderObject&& other) = delete;
+  ~BorderRenderObject() override;
+
+  bool IsEnabled() const { return is_enabled_; }
+  void SetEnabled(bool enabled) { is_enabled_ = enabled; }
+
+  ID2D1Brush* GetBrush() const { return border_brush_; }
+  void SetBrush(ID2D1Brush* new_brush);
+
+  Thickness GetBorderWidth() const { return border_thickness_; }
+  void SetBorderWidth(const Thickness& thickness) {
+    border_thickness_ = thickness;
+  }
+
+  CornerRadius GetCornerRadius() const { return corner_radius_; }
+  void SetCornerRadius(const CornerRadius& new_corner_radius) {
+    corner_radius_ = new_corner_radius;
+  }
+
+  void Refresh() { RecreateGeometry(); }
+
+  void Draw(ID2D1RenderTarget* render_target) override;
+
+  RenderObject* HitTest(const Point& point) override;
+
+ protected:
+  void OnAddChild(RenderObject* new_child, int position) override;
+
+  void OnSizeChanged(const Size& old_size, const Size& new_size) override;
+
+  void OnMeasureCore(const Size& available_size) override;
+  void OnLayoutCore(const Rect& rect) override;
+  Size OnMeasureContent(const Size& available_size) override;
+  void OnLayoutContent(const Rect& content_rect) override;
+
+ private:
+  RenderObject* GetChild() const {
+    return GetChildren().empty() ? nullptr : GetChildren()[0];
+  }
+
+  void RecreateGeometry();
+
+ private:
+  bool is_enabled_ = false;
+
+  ID2D1Brush* border_brush_ = nullptr;
+  Thickness border_thickness_ = Thickness::Zero();
+  CornerRadius corner_radius_{};
+
+  ID2D1Geometry* geometry_ = nullptr;
+  ID2D1Geometry* border_outer_geometry_ = nullptr;
+};
+}  // namespace cru::ui::render
diff --git a/include/cru/ui/render/flex_layout_render_object.hpp b/include/cru/ui/render/flex_layout_render_object.hpp
new file mode 100644
index 00000000..278bf8c2
--- /dev/null
+++ b/include/cru/ui/render/flex_layout_render_object.hpp
@@ -0,0 +1,57 @@
+#pragma once
+#include "render_object.hpp"
+
+#include <optional>
+
+namespace cru::ui::render {
+enum class FlexDirection {
+  Horizontal,
+  HorizontalReverse,
+  Vertical,
+  VertivalReverse
+};
+
+enum class Alignment { Start, End, Center };
+
+struct FlexChildLayoutData {
+  std::optional<float> flex_basis;  // nullopt stands for content
+  float flex_grow = 0;
+  float flex_shrink = 0;
+  Alignment alignment = Alignment::Center;
+};
+
+class FlexLayoutRenderObject : public RenderObject {
+ public:
+  FlexLayoutRenderObject() = default;
+  FlexLayoutRenderObject(const FlexLayoutRenderObject& other) = delete;
+  FlexLayoutRenderObject& operator=(const FlexLayoutRenderObject& other) =
+      delete;
+  FlexLayoutRenderObject(FlexLayoutRenderObject&& other) = delete;
+  FlexLayoutRenderObject& operator=(FlexLayoutRenderObject&& other) = delete;
+  ~FlexLayoutRenderObject() override = default;
+
+  FlexDirection GetFlexDirection() const { return direction_; }
+  void SetFlexDirection(FlexDirection direction) { direction_ = direction; }
+
+  Alignment GetContentMainAlign() const { return content_main_align_; }
+  void SetContentMainAlign(Alignment align) { content_main_align_ = align; }
+
+  FlexChildLayoutData* GetChildLayoutData(int position);
+
+  void Draw(platform::Painter* painter) override;
+
+  RenderObject* HitTest(const Point& point) override;
+
+ protected:
+  void OnAddChild(RenderObject* new_child, int position) override;
+  void OnRemoveChild(RenderObject* removed_child, int position) override;
+
+  Size OnMeasureContent(const Size& available_size) override;
+  void OnLayoutContent(const Rect& content_rect) override;
+
+ private:
+  FlexDirection direction_ = FlexDirection::Horizontal;
+  Alignment content_main_align_ = Alignment::Start;
+  std::vector<FlexChildLayoutData> child_layout_data_{};
+};
+}  // namespace cru::ui::render
diff --git a/include/cru/ui/render/render_object.hpp b/include/cru/ui/render/render_object.hpp
new file mode 100644
index 00000000..3cd14a6a
--- /dev/null
+++ b/include/cru/ui/render/render_object.hpp
@@ -0,0 +1,98 @@
+#pragma once
+#include "cru/common/base.hpp"
+
+#include "cru/common/ui_base.hpp"
+
+#include <vector>
+
+// forward declarations
+namespace cru::ui {
+class Control;
+}
+
+namespace cru::platform {
+struct Painter;
+}
+
+namespace cru::ui::render {
+class RenderObject : public Object {
+ protected:
+  RenderObject() = default;
+
+ public:
+  RenderObject(const RenderObject& other) = delete;
+  RenderObject(RenderObject&& other) = delete;
+  RenderObject& operator=(const RenderObject& other) = delete;
+  RenderObject& operator=(RenderObject&& other) = delete;
+  ~RenderObject() override = default;
+
+  Control* GetAttachedControl() const { return control_; }
+  void SetAttachedControl(Control* new_control) { control_ = new_control; }
+
+  RenderObject* GetParent() const { return parent_; }
+
+  const std::vector<RenderObject*>& GetChildren() const { return children_; }
+  void AddChild(RenderObject* render_object, int position);
+  void RemoveChild(int position);
+
+  Point GetOffset() const { return offset_; }
+  void SetOffset(const Point& offset) { offset_ = offset; }
+  Size GetSize() const { return size_; }
+  void SetSize(const Size& size) {
+    const auto old_size = size_;
+    size_ = size;
+    OnSizeChanged(old_size, size);
+  }
+
+  Thickness GetMargin() const { return margin_; }
+  void SetMargin(const Thickness& margin) { margin_ = margin; }
+
+  Thickness GetPadding() const { return padding_; }
+  void SetPadding(const Thickness& padding) { padding_ = padding; }
+
+  Size GetPreferredSize() const { return preferred_size_; }
+  void SetPreferredSize(const Size& preferred_size) {
+    preferred_size_ = preferred_size;
+  }
+
+  void Measure(const Size& available_size);
+  void Layout(const Rect& rect);
+
+  virtual void Draw(platform::Painter* render_target) = 0;
+
+  virtual RenderObject* HitTest(const Point& point) = 0;
+
+ protected:
+  virtual void OnParentChanged(RenderObject* old_parent,
+                               RenderObject* new_parent);
+
+  virtual void OnAddChild(RenderObject* new_child, int position);
+  virtual void OnRemoveChild(RenderObject* removed_child, int position);
+
+  virtual void OnSizeChanged(const Size& old_size, const Size& new_size);
+
+  virtual void OnMeasureCore(const Size& available_size);
+  virtual void OnLayoutCore(const Rect& rect);
+  virtual Size OnMeasureContent(const Size& available_size) = 0;
+  virtual void OnLayoutContent(const Rect& content_rect) = 0;
+
+  Rect GetContentRect() const;
+
+ private:
+  void SetParent(RenderObject* new_parent);
+
+ private:
+  Control* control_ = nullptr;
+
+  RenderObject* parent_ = nullptr;
+  std::vector<RenderObject*> children_{};
+
+  Point offset_{};
+  Size size_{};
+
+  Thickness margin_{};
+  Thickness padding_{};
+
+  Size preferred_size_{};
+};
+}  // namespace cru::ui::render
diff --git a/include/cru/ui/render/text_render_object.hpp b/include/cru/ui/render/text_render_object.hpp
new file mode 100644
index 00000000..7827f994
--- /dev/null
+++ b/include/cru/ui/render/text_render_object.hpp
@@ -0,0 +1,69 @@
+#pragma once
+#include "pre.hpp"
+
+#include "render_object.hpp"
+
+// forward declarations
+struct ID2D1Brush;
+struct IDWriteTextFormat;
+struct IDWriteTextLayout;
+
+namespace cru::ui::render {
+class TextRenderObject : public RenderObject {
+ public:
+  TextRenderObject(ID2D1Brush* brush, IDWriteTextFormat* format,
+                   ID2D1Brush* selection_brush);
+  TextRenderObject(const TextRenderObject& other) = delete;
+  TextRenderObject(TextRenderObject&& other) = delete;
+  TextRenderObject& operator=(const TextRenderObject& other) = delete;
+  TextRenderObject& operator=(TextRenderObject&& other) = delete;
+  ~TextRenderObject() override;
+
+  String GetText() const { return text_; }
+  void SetText(String new_text) {
+    text_ = std::move(new_text);
+    RecreateTextLayout();
+  }
+
+  ID2D1Brush* GetBrush() const { return brush_; }
+  void SetBrush(ID2D1Brush* new_brush);
+
+  IDWriteTextFormat* GetTextFormat() const { return text_format_; }
+  void SetTextFormat(IDWriteTextFormat* new_text_format);
+
+  std::optional<TextRange> GetSelectionRange() const {
+    return selection_range_;
+  }
+  void SetSelectionRange(std::optional<TextRange> new_range) {
+    selection_range_ = std::move(new_range);
+  }
+
+  ID2D1Brush* GetSelectionBrush() const { return selection_brush_; }
+  void SetSelectionBrush(ID2D1Brush* new_brush);
+
+  void Refresh() { RecreateTextLayout(); }
+
+  void Draw(ID2D1RenderTarget* render_target) override;
+
+  RenderObject* HitTest(const Point& point) override;
+
+ protected:
+  void OnSizeChanged(const Size& old_size, const Size& new_size) override;
+
+  Size OnMeasureContent(const Size& available_size) override;
+  void OnLayoutContent(const Rect& content_rect) override;
+
+ private:
+  void RecreateTextLayout();
+
+ private:
+  String text_;
+
+  ID2D1Brush* brush_ = nullptr;
+  IDWriteTextFormat* text_format_ = nullptr;
+  IDWriteTextLayout* text_layout_ = nullptr;
+
+  std::optional<TextRange> selection_range_ = std::nullopt;
+  ID2D1Brush* selection_brush_ = nullptr;
+};
+}  // namespace cru::ui::render
diff --git a/include/cru/ui/render/window_render_object.hpp b/include/cru/ui/render/window_render_object.hpp
new file mode 100644
index 00000000..63eb8588
--- /dev/null
+++ b/include/cru/ui/render/window_render_object.hpp
@@ -0,0 +1,40 @@
+#pragma once
+#include "pre.hpp"
+
+#include "render_object.hpp"
+
+namespace cru::ui {
+class Window;
+}
+
+namespace cru::ui::render {
+class WindowRenderObject : public RenderObject {
+ public:
+  WindowRenderObject(Window* window) : window_(window) {}
+  WindowRenderObject(const WindowRenderObject& other) = delete;
+  WindowRenderObject(WindowRenderObject&& other) = delete;
+  WindowRenderObject& operator=(const WindowRenderObject& other) = delete;
+  WindowRenderObject& operator=(WindowRenderObject&& other) = delete;
+  ~WindowRenderObject() override = default;
+
+  void MeasureAndLayout();
+
+  void Draw(ID2D1RenderTarget* render_target) override;
+
+  RenderObject* HitTest(const Point& point) override;
+
+ protected:
+  void OnAddChild(RenderObject* new_child, int position) override;
+
+  Size OnMeasureContent(const Size& available_size) override;
+  void OnLayoutContent(const Rect& content_rect) override;
+
+ private:
+  RenderObject* GetChild() const {
+    return GetChildren().empty() ? nullptr : GetChildren()[0];
+  }
+
+ private:
+  Window* window_;
+};
+}  // namespace cru::ui::render