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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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10
Libraries/LibGUI/GWindow.cpp
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@ -154,6 +154,16 @@ void GWindow::set_override_cursor(GStandardCursor cursor)
void GWindow::event(CEvent& event)
{
if (event.type() == GEvent::Drop) {
auto& drop_event = static_cast<GDropEvent&>(event);
if (!m_main_widget)
return;
auto result = m_main_widget->hit_test(drop_event.position());
auto local_event = make<GDropEvent>(result.local_position, drop_event.text());
ASSERT(result.widget);
return result.widget->dispatch_event(*local_event, this);
}
if (event.type() == GEvent::MouseUp || event.type() == GEvent::MouseDown || event.type() == GEvent::MouseDoubleClick || event.type() == GEvent::MouseMove || event.type() == GEvent::MouseWheel) {
auto& mouse_event = static_cast<GMouseEvent&>(event);
if (m_global_cursor_tracking_widget) {