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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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3
Libraries/LibGUI/GItemView.h
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@ -29,6 +29,7 @@ private:
virtual void paint_event(GPaintEvent&) override;
virtual void resize_event(GResizeEvent&) override;
virtual void mousedown_event(GMouseEvent&) override;
virtual void mousemove_event(GMouseEvent&) override;
virtual void keydown_event(GKeyEvent&) override;
virtual void doubleclick_event(GMouseEvent&) override;
virtual void context_menu_event(GContextMenuEvent&) override;
@ -43,5 +44,7 @@ private:
int m_visual_column_count { 0 };
int m_visual_row_count { 0 };
Point m_left_mousedown_position;
Size m_effective_item_size { 80, 80 };
};