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LibGUI+WindowServer: Start fleshing out drag&drop functionality

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This patch enables basic drag&drop between applications.
You initiate a drag by creating a GDragOperation object and calling
exec() on it. This creates a nested event loop in the calling program
that only returns once the drag operation has ended.

On the receiving side, you get a call to GWidget::drop_event() with
a GDropEvent containing information about the dropped data.

The only data passed right now is a piece of text that's also used
to visually indicate that a drag is happening (by showing the text in
a little box that follows the mouse cursor around.)

There are things to fix here, but we're off to a nice start. :^)
This commit is contained in:
Andreas Kling 2019-12-08 16:50:23 +01:00
parent e09a02ad3f
commit a7f414bba7
19 changed files with 318 additions and 3 deletions
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13
Servers/WindowServer/WSWindowManager.h
View file

@ -66,6 +66,14 @@ public:
Rect maximized_window_rect(const WSWindow&) const;
WSClientConnection* dnd_client() { return m_dnd_client.ptr(); }
const String& dnd_text() const { return m_dnd_text; }
const GraphicsBitmap* dnd_bitmap() const { return m_dnd_bitmap; }
Rect dnd_rect() const;
void start_dnd_drag(WSClientConnection&, const String& text, GraphicsBitmap*);
void end_dnd_drag();
WSWindow* active_window() { return m_active_window.ptr(); }
const WSClientConnection* active_client() const;
bool active_window_is_modal() const { return m_active_window && m_active_window->is_modal(); }
@ -156,6 +164,7 @@ private:
void deliver_mouse_event(WSWindow& window, WSMouseEvent& event);
bool process_ongoing_window_resize(const WSMouseEvent&, WSWindow*& hovered_window);
bool process_ongoing_window_drag(WSMouseEvent&, WSWindow*& hovered_window);
bool process_ongoing_drag(WSMouseEvent&, WSWindow*& hovered_window);
void start_window_drag(WSWindow&, const WSMouseEvent&);
void set_hovered_window(WSWindow*);
template<typename Callback>
@ -268,6 +277,10 @@ private:
};
Vector<AppMetadata> m_apps;
HashMap<String, NonnullRefPtr<WSMenu>> m_app_category_menus;
WeakPtr<WSClientConnection> m_dnd_client;
String m_dnd_text;
RefPtr<GraphicsBitmap> m_dnd_bitmap;
};
template<typename Callback>