Taskbar+LibGUI: More work on bringup.

LibGUI/GEvent.h

@@ -36,6 +36,9 @@ public:
         WindowCloseRequest,
         ChildAdded,
         ChildRemoved,
+        WM_WindowAdded,
+        WM_WindowRemoved,
+        WM_WindowStateChanged,
     };
 
     GEvent() { }
@@ -52,6 +55,65 @@ private:
     Type m_type { Invalid };
 };
 
+class GWMEvent : public GEvent {
+public:
+    GWMEvent(Type type, int client_id, int window_id)
+        : GEvent(type)
+        , m_client_id(client_id)
+        , m_window_id(window_id)
+    {
+    }
+
+    int client_id() const { return m_client_id; }
+    int window_id() const { return m_window_id; }
+
+private:
+    int m_client_id { -1 };
+    int m_window_id { -1 };
+};
+
+class GWMWindowAddedEvent : public GWMEvent {
+public:
+    GWMWindowAddedEvent(int client_id, int window_id, const String& title, const Rect& rect)
+        : GWMEvent(GEvent::Type::WM_WindowAdded, client_id, window_id)
+        , m_title(title)
+        , m_rect(rect)
+    {
+    }
+
+    String title() const { return m_title; }
+    Rect rect() const { return m_rect; }
+
+private:
+    String m_title;
+    Rect m_rect;
+};
+
+class GWMWindowRemovedEvent : public GWMEvent {
+public:
+    GWMWindowRemovedEvent(int client_id, int window_id)
+        : GWMEvent(GEvent::Type::WM_WindowRemoved, client_id, window_id)
+    {
+    }
+};
+
+class GWMWindowStateChangedEvent : public GWMEvent {
+public:
+    GWMWindowStateChangedEvent(int client_id, int window_id, const String& title, const Rect& rect)
+        : GWMEvent(GEvent::Type::WM_WindowStateChanged, client_id, window_id)
+        , m_title(title)
+        , m_rect(rect)
+    {
+    }
+
+    String title() const { return m_title; }
+    Rect rect() const { return m_rect; }
+
+private:
+    String m_title;
+    Rect m_rect;
+};
+
 class QuitEvent final : public GEvent {
 public:
     QuitEvent()

LibGUI/GWindow.cpp

@@ -258,6 +258,9 @@ void GWindow::event(GEvent& event)
         return;
     }
 
+    if (event.type() == GEvent::WM_WindowAdded || event.type() == GEvent::WM_WindowRemoved || event.type() == GEvent::WM_WindowStateChanged)
+        return wm_event(static_cast<GWMEvent&>(event));
+
     GObject::event(event);
 }
 
@@ -422,3 +425,7 @@ void GWindow::set_modal(bool modal)
     ASSERT(!m_window_id);
     m_modal = modal;
 }
+
+void GWindow::wm_event(GWMEvent&)
+{
+}

LibGUI/GWindow.h

@@ -7,6 +7,7 @@
 #include <AK/WeakPtr.h>
 
 class GWidget;
+class GWMEvent;
 
 enum class GStandardCursor {
     None = 0,
@@ -103,6 +104,9 @@ public:
 
     virtual const char* class_name() const override { return "GWindow"; }
 
+protected:
+    virtual void wm_event(GWMEvent&);
+
 private:
     virtual bool is_window() const override final { return true; }