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LibGUI+WindowServer: Start fleshing out drag&drop functionality

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

View file

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#pragma once
#include <LibCore/CEventLoop.h>
#include <LibCore/CObject.h>
class GWindowServerConnection;
class GDragOperation : public CObject {
C_OBJECT(GDragOperation)
public:
enum class Outcome {
None,
Accepted,
Cancelled,
};
virtual ~GDragOperation() override;
void set_text(const String& text) { m_text = text; }
Outcome exec();
Outcome outcome() const { return m_outcome; }
static void notify_accepted(Badge<GWindowServerConnection>);
static void notify_cancelled(Badge<GWindowServerConnection>);
protected:
explicit GDragOperation(CObject* parent = nullptr);
private:
void done(Outcome);
OwnPtr<CEventLoop> m_event_loop;
Outcome m_outcome { Outcome::None };
String m_text;
};