Bring back ControlHost and refactor tree management of control.

1 files changed, 7 insertions, 397 deletions

diff --git a/src/ui/controls/Window.cpp b/src/ui/controls/Window.cpp
index c82b2485..a5fbf05f 100644
--- a/src/ui/controls/Window.cpp
+++ b/src/ui/controls/Window.cpp
@@ -1,26 +1,18 @@
 #include "cru/ui/controls/Window.h"
-
 #include "cru/platform/gui/UiApplication.h"
 #include "cru/platform/gui/Window.h"
 #include "cru/ui/Base.h"
+#include "cru/ui/controls/ControlHost.h"
 
 #include <cassert>
 
 namespace cru::ui::controls {
 Window::Window()
-    : event_handling_count_(0),
-      native_window_(CreateNativeWindow()),
-      focus_control_(this),
-      mouse_hover_control_(nullptr),
-      mouse_captured_control_(nullptr),
-      layout_prefer_to_fill_window_(true),
-      attached_control_(nullptr) {
+    : control_host_(new ControlHost(this)), attached_control_(nullptr) {
   GetContainerRenderObject()->SetDefaultHorizontalAlignment(Alignment::Stretch);
   GetContainerRenderObject()->SetDefaultVertialAlignment(Alignment::Stretch);
 }
 
-Window::~Window() {}
-
 Window* Window::CreatePopup() {
   auto window = new Window();
   window->GetNativeWindow()->SetStyleFlag(
@@ -36,409 +28,27 @@ void Window::SetAttachedControl(Control* control) {
 }
 
 platform::gui::INativeWindow* Window::GetNativeWindow() {
-  return native_window_.get();
+  return control_host_->GetNativeWindow();
 }
 
 void Window::SetGainFocusOnCreateAndDestroyWhenLoseFocus(bool value) {
   gain_focus_on_create_and_destroy_when_lose_focus_event_guard_.Clear();
   if (value) {
     gain_focus_on_create_and_destroy_when_lose_focus_event_guard_ +=
-        native_window_->VisibilityChangeEvent()->AddHandler(
+        GetNativeWindow()->VisibilityChangeEvent()->AddHandler(
             [this](platform::gui::WindowVisibilityType type) {
               if (type == platform::gui::WindowVisibilityType::Show) {
-                native_window_->RequestFocus();
+                GetNativeWindow()->RequestFocus();
               }
             });
 
     gain_focus_on_create_and_destroy_when_lose_focus_event_guard_ +=
-        native_window_->FocusEvent()->AddHandler(
+        GetNativeWindow()->FocusEvent()->AddHandler(
             [this](platform::gui::FocusChangeType type) {
               if (type == platform::gui::FocusChangeType::Lose) {
-                native_window_->Close();
+                GetNativeWindow()->Close();
               }
             });
   }
 }
-
-namespace {
-template <typename T>
-inline void BindNativeEvent(
-    Window* window, platform::gui::INativeWindow* native_window,
-    IEvent<T>* event,
-    void (Window::*handler)(platform::gui::INativeWindow*,
-                            typename IEvent<T>::Args)) {
-  event->AddHandler(
-      std::bind(handler, window, native_window, std::placeholders::_1));
-}
-}  // namespace
-
-namespace {
-bool IsAncestor(Control* control, Control* ancestor) {
-  while (control != nullptr) {
-    if (control == ancestor) return true;
-    control = control->GetParent();
-  }
-  return false;
-}
-
-// Ancestor at last.
-std::vector<Control*> GetAncestorList(Control* control) {
-  if (control == nullptr) return {};
-
-  std::vector<Control*> l;
-  while (control != nullptr) {
-    l.push_back(control);
-    control = control->GetParent();
-  }
-  return l;
-}
-
-Control* FindLowestCommonAncestor(Control* left, Control* right) {
-  if (left == nullptr || right == nullptr) return nullptr;
-
-  auto&& left_list = GetAncestorList(left);
-  auto&& right_list = GetAncestorList(right);
-
-  // the root is different
-  if (left_list.back() != right_list.back()) return nullptr;
-
-  // find the last same control or the last control (one is ancestor of the
-  // other)
-  auto left_iter = left_list.crbegin();
-  auto right_iter = right_list.crbegin();
-
-  while (true) {
-    if (left_iter == left_list.crend()) {
-      return left_list.front();
-    }
-    if (right_iter == right_list.crend()) {
-      return right_list.front();
-    }
-    if (*left_iter != *right_iter) {
-      return *(--left_iter);
-    }
-    ++left_iter;
-    ++right_iter;
-  }
-}
-}  // namespace
-
-std::unique_ptr<platform::gui::INativeWindow> Window::CreateNativeWindow() {
-  const auto ui_application = platform::gui::IUiApplication::GetInstance();
-
-  auto native_window = ui_application->CreateWindow();
-  assert(native_window);
-
-  BindNativeEvent(this, native_window, native_window->DestroyEvent(),
-                  &Window::OnNativeDestroy);
-  BindNativeEvent(this, native_window, native_window->PaintEvent(),
-                  &Window::OnNativePaint);
-  BindNativeEvent(this, native_window, native_window->ResizeEvent(),
-                  &Window::OnNativeResize);
-  BindNativeEvent(this, native_window, native_window->FocusEvent(),
-                  &Window::OnNativeFocus);
-  BindNativeEvent(this, native_window, native_window->MouseEnterLeaveEvent(),
-                  &Window::OnNativeMouseEnterLeave);
-  BindNativeEvent(this, native_window, native_window->MouseMoveEvent(),
-                  &Window::OnNativeMouseMove);
-  BindNativeEvent(this, native_window, native_window->MouseDownEvent(),
-                  &Window::OnNativeMouseDown);
-  BindNativeEvent(this, native_window, native_window->MouseUpEvent(),
-                  &Window::OnNativeMouseUp);
-  BindNativeEvent(this, native_window, native_window->MouseWheelEvent(),
-                  &Window::OnNativeMouseWheel);
-  BindNativeEvent(this, native_window, native_window->KeyDownEvent(),
-                  &Window::OnNativeKeyDown);
-  BindNativeEvent(this, native_window, native_window->KeyUpEvent(),
-                  &Window::OnNativeKeyUp);
-
-  return std::unique_ptr<platform::gui::INativeWindow>(native_window);
-}
-
-void Window::InvalidatePaint() {
-  repaint_schedule_canceler_.Reset(
-      platform::gui::IUiApplication::GetInstance()->SetImmediate(
-          [this] { Repaint(); }));
-}
-
-void Window::InvalidateLayout() {
-  relayout_schedule_canceler_.Reset(
-      platform::gui::IUiApplication::GetInstance()->SetImmediate(
-          [this] { Relayout(); }));
-}
-
-bool Window::IsLayoutPreferToFillWindow() const {
-  return layout_prefer_to_fill_window_;
-}
-
-void Window::SetLayoutPreferToFillWindow(bool value) {
-  if (value == layout_prefer_to_fill_window_) return;
-  layout_prefer_to_fill_window_ = value;
-  InvalidateLayout();
-}
-
-void Window::Repaint() {
-  auto painter = native_window_->BeginPaint();
-  painter->Clear(colors::white);
-  GetRenderObject()->Draw(painter.get());
-  painter->EndDraw();
-}
-
-void Window::Relayout() { RelayoutWithSize(native_window_->GetClientSize()); }
-
-void Window::RelayoutWithSize(const Size& available_size,
-                              bool set_window_size_to_fit_content) {
-  auto render_object = GetRenderObject();
-  render_object->Measure(
-      render::MeasureRequirement{
-          available_size,
-          !set_window_size_to_fit_content && IsLayoutPreferToFillWindow()
-              ? render::MeasureSize(available_size)
-              : render::MeasureSize::NotSpecified()},
-      render::MeasureSize::NotSpecified());
-
-  if (set_window_size_to_fit_content) {
-    native_window_->SetClientSize(render_object->GetDesiredSize());
-  }
-
-  render_object->Layout(Point{});
-  CRU_LOG_TAG_DEBUG("A relayout is finished.");
-
-  AfterLayoutEvent_.Raise(nullptr);
-
-  InvalidatePaint();
-}
-
-Control* Window::GetFocusControl() { return focus_control_; }
-
-void Window::SetFocusControl(Control* control) {
-  if (control == nullptr) control = this;
-  if (focus_control_ == control) return;
-
-  const auto old_focus_control = focus_control_;
-
-  focus_control_ = control;
-
-  DispatchFocusControlChangeEvent(old_focus_control, focus_control_, false);
-}
-
-Control* Window::GetMouseCaptureControl() { return mouse_captured_control_; }
-
-bool Window::SetMouseCaptureControl(Control* control) {
-  if (!native_window_->CaptureMouse()) return false;
-
-  if (control == mouse_captured_control_) return true;
-
-  if (control == nullptr) {
-    native_window_->ReleaseMouse();
-    const auto old_capture_control = mouse_captured_control_;
-    mouse_captured_control_ =
-        nullptr;  // update this in case this is used in event handlers
-    if (old_capture_control != mouse_hover_control_) {
-      DispatchMouseHoverControlChangeEvent(
-          old_capture_control, mouse_hover_control_,
-          native_window_->GetMousePosition(), true, false);
-    }
-    UpdateCursor();
-    return true;
-  }
-
-  if (mouse_captured_control_) return false;
-
-  mouse_captured_control_ = control;
-  DispatchMouseHoverControlChangeEvent(
-      mouse_hover_control_, mouse_captured_control_,
-      native_window_->GetMousePosition(), false, true);
-  UpdateCursor();
-  return true;
-}
-
-std::shared_ptr<platform::gui::ICursor> Window::GetOverrideCursor() {
-  return override_cursor_;
-}
-
-void Window::SetOverrideCursor(std::shared_ptr<platform::gui::ICursor> cursor) {
-  if (cursor == override_cursor_) return;
-  override_cursor_ = cursor;
-  UpdateCursor();
-}
-
-bool Window::IsInEventHandling() { return event_handling_count_; }
-
-void Window::OnNativeDestroy(platform::gui::INativeWindow* window,
-                             std::nullptr_t) {
-  CRU_UNUSED(window)
-}
-
-void Window::OnNativePaint(platform::gui::INativeWindow* window,
-                           std::nullptr_t) {
-  CRU_UNUSED(window)
-  InvalidatePaint();
-}
-
-void Window::OnNativeResize(platform::gui::INativeWindow* window,
-                            const Size& size) {
-  CRU_UNUSED(window)
-  CRU_UNUSED(size)
-
-  InvalidateLayout();
-}
-
-void Window::OnNativeFocus(platform::gui::INativeWindow* window,
-                           platform::gui::FocusChangeType focus) {
-  CRU_UNUSED(window)
-
-  focus == platform::gui::FocusChangeType::Gain
-      ? DispatchEvent(focus_control_, &Control::GainFocusEvent, nullptr, true)
-      : DispatchEvent(focus_control_, &Control::LoseFocusEvent, nullptr, true);
-}
-
-void Window::OnNativeMouseEnterLeave(platform::gui::INativeWindow* window,
-                                     platform::gui::MouseEnterLeaveType type) {
-  CRU_UNUSED(window)
-
-  if (type == platform::gui::MouseEnterLeaveType::Leave) {
-    DispatchEvent(mouse_hover_control_, &Control::MouseLeaveEvent, nullptr);
-    mouse_hover_control_ = nullptr;
-  }
-}
-
-void Window::OnNativeMouseMove(platform::gui::INativeWindow* window,
-                               const Point& point) {
-  CRU_UNUSED(window)
-
-  // Find the first control that hit test succeed.
-  const auto new_mouse_hover_control = HitTest(point);
-  const auto old_mouse_hover_control = mouse_hover_control_;
-  mouse_hover_control_ = new_mouse_hover_control;
-
-  if (mouse_captured_control_) {
-    const auto n = FindLowestCommonAncestor(new_mouse_hover_control,
-                                            mouse_captured_control_);
-    const auto o = FindLowestCommonAncestor(old_mouse_hover_control,
-                                            mouse_captured_control_);
-    bool a = IsAncestor(o, n);
-    if (a) {
-      DispatchEvent(o, &Control::MouseLeaveEvent, n);
-    } else {
-      DispatchEvent(n, &Control::MouseEnterEvent, o, point);
-    }
-    DispatchEvent(mouse_captured_control_, &Control::MouseMoveEvent, nullptr,
-                  point);
-    UpdateCursor();
-    return;
-  }
-
-  DispatchMouseHoverControlChangeEvent(
-      old_mouse_hover_control, new_mouse_hover_control, point, false, false);
-  DispatchEvent(new_mouse_hover_control, &Control::MouseMoveEvent, nullptr,
-                point);
-  UpdateCursor();
-}
-
-void Window::OnNativeMouseDown(
-    platform::gui::INativeWindow* window,
-    const platform::gui::NativeMouseButtonEventArgs& args) {
-  CRU_UNUSED(window)
-
-  Control* control =
-      mouse_captured_control_ ? mouse_captured_control_ : HitTest(args.point);
-  DispatchEvent(control, &Control::MouseDownEvent, nullptr, args.point,
-                args.button, args.modifier);
-}
-
-void Window::OnNativeMouseUp(
-    platform::gui::INativeWindow* window,
-    const platform::gui::NativeMouseButtonEventArgs& args) {
-  CRU_UNUSED(window)
-
-  Control* control =
-      mouse_captured_control_ ? mouse_captured_control_ : HitTest(args.point);
-  DispatchEvent(control, &Control::MouseUpEvent, nullptr, args.point,
-                args.button, args.modifier);
-}
-
-void Window::OnNativeMouseWheel(
-    platform::gui::INativeWindow* window,
-    const platform::gui::NativeMouseWheelEventArgs& args) {
-  CRU_UNUSED(window)
-
-  Control* control =
-      mouse_captured_control_ ? mouse_captured_control_ : HitTest(args.point);
-  DispatchEvent(control, &Control::MouseWheelEvent, nullptr, args.point,
-                args.delta, args.modifier);
-}
-
-void Window::OnNativeKeyDown(platform::gui::INativeWindow* window,
-                             const platform::gui::NativeKeyEventArgs& args) {
-  CRU_UNUSED(window)
-
-  DispatchEvent(focus_control_, &Control::KeyDownEvent, nullptr, args.key,
-                args.modifier);
-}
-
-void Window::OnNativeKeyUp(platform::gui::INativeWindow* window,
-                           const platform::gui::NativeKeyEventArgs& args) {
-  CRU_UNUSED(window)
-
-  DispatchEvent(focus_control_, &Control::KeyUpEvent, nullptr, args.key,
-                args.modifier);
-}
-
-void Window::DispatchFocusControlChangeEvent(Control* old_control,
-                                             Control* new_control,
-                                             bool is_window) {
-  if (new_control != old_control) {
-    const auto lowest_common_ancestor =
-        FindLowestCommonAncestor(old_control, new_control);
-    DispatchEvent(old_control, &Control::LoseFocusEvent, lowest_common_ancestor,
-                  is_window);
-    DispatchEvent(new_control, &Control::GainFocusEvent, lowest_common_ancestor,
-                  is_window);
-  }
-}
-
-void Window::DispatchMouseHoverControlChangeEvent(Control* old_control,
-                                                  Control* new_control,
-                                                  const Point& point,
-                                                  bool no_leave,
-                                                  bool no_enter) {
-  if (new_control != old_control)  // if the mouse-hover-on control changed
-  {
-    const auto lowest_common_ancestor =
-        FindLowestCommonAncestor(old_control, new_control);
-    if (!no_leave && old_control != nullptr)
-      DispatchEvent(old_control, &Control::MouseLeaveEvent,
-                    lowest_common_ancestor);  // dispatch mouse leave event.
-    if (!no_enter && new_control != nullptr) {
-      DispatchEvent(new_control, &Control::MouseEnterEvent,
-                    lowest_common_ancestor,
-                    point);  // dispatch mouse enter event.
-    }
-  }
-}
-
-void Window::UpdateCursor() {
-  if (override_cursor_) {
-    native_window_->SetCursor(override_cursor_);
-  } else {
-    const auto capture = GetMouseCaptureControl();
-    native_window_->SetCursor(
-        (capture ? capture : GetMouseHoverControl())->GetInheritedCursor());
-  }
-}
-
-void Window::NotifyControlDestroyed(Control* control) {
-  if (focus_control_->HasAncestor(control)) {
-    focus_control_ = control->GetParent();
-  }
-
-  if (mouse_captured_control_->HasAncestor(control)) {
-    mouse_captured_control_ = control->GetParent();
-  }
-
-  if (mouse_hover_control_->HasAncestor(control)) {
-    mouse_hover_control_ = control->GetParent();
-  }
-}
 }  // namespace cru::ui::controls