libui+wind: Handle mouse leave events when the mouse leaves a window

apps/gclient.cpp

@@ -14,7 +14,7 @@ struct ColorWidget : public ui::Widget
         return ui::EventResult::DidHandle;
     }
 
-    Result<ui::EventResult> handle_mouse_leave(ui::Point) override
+    Result<ui::EventResult> handle_mouse_leave() override
     {
         m_color = m_first_color;
         return ui::EventResult::DidHandle;

libui/include/ui/Button.h

@@ -21,7 +21,7 @@ namespace ui
         void set_action(void (*action)(void));
 
         Result<EventResult> handle_mouse_move(Point position) override;
-        Result<EventResult> handle_mouse_leave(Point position) override;
+        Result<EventResult> handle_mouse_leave() override;
         Result<EventResult> handle_mouse_down(Point position, int buttons) override;
         Result<EventResult> handle_mouse_up(Point position, int buttons) override;
         Result<void> draw(Canvas& canvas) override;

libui/include/ui/Container.h

@@ -21,7 +21,7 @@ namespace ui
         void set_widget(Widget& widget);
 
         Result<EventResult> handle_mouse_move(Point position) override;
-        Result<EventResult> handle_mouse_leave(Point position) override;
+        Result<EventResult> handle_mouse_leave() override;
         Result<EventResult> handle_mouse_down(Point position, int buttons) override;
         Result<EventResult> handle_mouse_up(Point position, int buttons) override;
         Result<void> draw(Canvas& canvas) override;

libui/include/ui/Image.h

@@ -85,7 +85,7 @@ namespace ui
         static Result<OwnedPtr<ImageWidget>> load(const os::Path& path);
 
         Result<EventResult> handle_mouse_move(Point position) override;
-        Result<EventResult> handle_mouse_leave(Point position) override;
+        Result<EventResult> handle_mouse_leave() override;
         Result<EventResult> handle_mouse_down(Point position, int buttons) override;
         Result<EventResult> handle_mouse_up(Point position, int buttons) override;
         Result<void> draw(Canvas& canvas) override;

libui/include/ui/Layout.h

@@ -31,7 +31,7 @@ namespace ui
         HorizontalLayout(AdjustHeight adjust_height = AdjustHeight::Yes, AdjustWidth adjust_width = AdjustWidth::Yes);
 
         Result<EventResult> handle_mouse_move(Point position) override;
-        Result<EventResult> handle_mouse_leave(Point position) override;
+        Result<EventResult> handle_mouse_leave() override;
         Result<EventResult> handle_mouse_down(Point position, int buttons) override;
         Result<EventResult> handle_mouse_up(Point position, int buttons) override;
 
@@ -52,7 +52,7 @@ namespace ui
         VerticalLayout(AdjustHeight adjust_height = AdjustHeight::Yes, AdjustWidth adjust_width = AdjustWidth::Yes);
 
         Result<EventResult> handle_mouse_move(Point position) override;
-        Result<EventResult> handle_mouse_leave(Point position) override;
+        Result<EventResult> handle_mouse_leave() override;
         Result<EventResult> handle_mouse_down(Point position, int buttons) override;
         Result<EventResult> handle_mouse_up(Point position, int buttons) override;
 

libui/include/ui/Widget.h

@@ -29,7 +29,7 @@ namespace ui
         virtual Result<EventResult> handle_mouse_move(Point position);
         virtual Result<EventResult> handle_mouse_down(Point position, int buttons);
         virtual Result<EventResult> handle_mouse_up(Point position, int buttons);
-        virtual Result<EventResult> handle_mouse_leave(Point position);
+        virtual Result<EventResult> handle_mouse_leave();
 
         virtual Result<void> draw(Canvas& canvas);
 

libui/include/ui/Window.h

@@ -46,6 +46,7 @@ namespace ui
         void close();
 
         Result<void> draw();
+        Result<void> handle_mouse_leave();
         Result<void> handle_mouse_move(ui::Point position);
         Result<void> handle_mouse_buttons(ui::Point position, int buttons);
 

libui/include/ui/ipc/Client.h

@@ -19,6 +19,7 @@ namespace ui
         CREATE_WINDOW_RESPONSE_ID,
         WINDOW_CLOSE_REQUEST_ID,
         MOUSE_EVENT_REQUEST_ID,
+        MOUSE_LEAVE_REQUEST_ID,
         GET_SCREEN_RECT_RESPONSE_ID
     };
 
@@ -46,6 +47,13 @@ namespace ui
         int buttons;
     };
 
+    struct MouseLeaveRequest
+    {
+        static constexpr u8 ID = MOUSE_LEAVE_REQUEST_ID;
+
+        int window;
+    };
+
     struct GetScreenRectResponse
     {
         static constexpr u8 ID = GET_SCREEN_RECT_RESPONSE_ID;

libui/src/App.cpp

@@ -122,6 +122,14 @@ namespace ui
             window->draw();
             return {};
         }
+        case MOUSE_LEAVE_REQUEST_ID: {
+            MouseLeaveRequest request;
+            READ_MESSAGE(request);
+            auto* window = find_window(request.window);
+            window->handle_mouse_leave();
+            window->draw();
+            return {};
+        }
         default: fail("Unexpected IPC request from server!");
         }
     }

libui/src/Button.cpp

@@ -35,10 +35,10 @@ namespace ui
         return m_child->handle_mouse_move(position);
     }
 
-    Result<EventResult> Button::handle_mouse_leave(Point position)
+    Result<EventResult> Button::handle_mouse_leave()
     {
         m_hovered = m_clicked = false;
-        return m_child->handle_mouse_leave(position);
+        return m_child->handle_mouse_leave();
     }
 
     Result<EventResult> Button::handle_mouse_down(Point position, int buttons)

libui/src/Container.cpp

@@ -29,9 +29,9 @@ namespace ui
         return m_widget->handle_mouse_move(position);
     }
 
-    Result<EventResult> Container::handle_mouse_leave(Point position)
+    Result<EventResult> Container::handle_mouse_leave()
     {
-        return m_widget->handle_mouse_leave(position);
+        return m_widget->handle_mouse_leave();
     }
 
     Result<EventResult> Container::handle_mouse_down(Point position, int buttons)

libui/src/Image.cpp

@@ -45,7 +45,7 @@ namespace ui
         return EventResult::DidNotHandle;
     }
 
-    Result<EventResult> ImageWidget::handle_mouse_leave(Point)
+    Result<EventResult> ImageWidget::handle_mouse_leave()
     {
         return EventResult::DidNotHandle;
     }

libui/src/Layout.cpp

@@ -25,15 +25,15 @@ namespace ui
         {
             if (widget->rect().contains(position)) result = TRY(widget->handle_mouse_move(position));
             else
-                TRY(widget->handle_mouse_leave(position));
+                TRY(widget->handle_mouse_leave());
         }
 
         return result;
     }
 
-    Result<EventResult> HorizontalLayout::handle_mouse_leave(Point position)
+    Result<EventResult> HorizontalLayout::handle_mouse_leave()
     {
-        for (auto widget : m_widgets) TRY(widget->handle_mouse_leave(position));
+        for (auto widget : m_widgets) TRY(widget->handle_mouse_leave());
 
         return ui::EventResult::DidNotHandle;
     }
@@ -114,15 +114,15 @@ namespace ui
         {
             if (widget->rect().contains(position)) result = TRY(widget->handle_mouse_move(position));
             else
-                TRY(widget->handle_mouse_leave(position));
+                TRY(widget->handle_mouse_leave());
         }
 
         return result;
     }
 
-    Result<EventResult> VerticalLayout::handle_mouse_leave(Point position)
+    Result<EventResult> VerticalLayout::handle_mouse_leave()
     {
-        for (auto widget : m_widgets) TRY(widget->handle_mouse_leave(position));
+        for (auto widget : m_widgets) TRY(widget->handle_mouse_leave());
 
         return ui::EventResult::DidNotHandle;
     }

libui/src/Window.cpp

@@ -101,6 +101,13 @@ namespace ui
         return {};
     }
 
+    Result<void> Window::handle_mouse_leave()
+    {
+        if (!m_main_widget) return {};
+        TRY(m_main_widget->handle_mouse_leave());
+        return {};
+    }
+
     Result<void> Window::handle_mouse_move(ui::Point position)
     {
         if (!m_main_widget) return {};

wind/Mouse.cpp

@@ -79,6 +79,8 @@ void Mouse::update(const moon::MousePacket& packet)
         }
     }
 
+    Window* new_active_window = nullptr;
+
     for (Window* window = g_windows.last().value_or(nullptr); window;
          window = g_windows.previous(window).value_or(nullptr))
     {
@@ -92,7 +94,19 @@ void Mouse::update(const moon::MousePacket& packet)
             request.position = contents.relative(m_position);
             request.buttons = packet.buttons;
             os::IPC::send_async(window->client->conn, request);
+            new_active_window = window;
             break;
         }
     }
+
+    if (m_active_window != new_active_window)
+    {
+        if (m_active_window)
+        {
+            ui::MouseLeaveRequest request;
+            request.window = m_active_window->id;
+            os::IPC::send_async(m_active_window->client->conn, request);
+        }
+        m_active_window = new_active_window;
+    }
 }

wind/Mouse.h

@@ -19,4 +19,6 @@ class Mouse
 
     Window* m_dragging_window = nullptr;
     ui::Point m_initial_drag_position;
+
+    Window* m_active_window = nullptr;
 };