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Enable Drag and Drop for SubViewports and Windows

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Make Drag and Drop an application-wide operation.
This allows do drop on Controls in other Viewports/Windows.

In order to achieve this, `Viewport::_update_mouse_over` is adjusted to
remember the Control, that the mouse is over (possibly within nested
viewports). This Control is used as a basis for the Drop-operation, which
replaces the previous algorithm, which was only aware of the topmost
Viewport.

Also now all nodes in the SceneTree are notified about the Drag and Drop
operation, with the exception of SubViewports that are not children of
SubViewportContainers.
This commit is contained in:
Markus Sauermann 2023-01-20 00:21:11 +01:00
parent 6681f2563b
commit 60aaa017ff
7 changed files with 213 additions and 148 deletions
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scene/main/window.h
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@ -469,7 +469,7 @@ public:
virtual Transform2D get_final_transform() const override;
virtual Transform2D get_screen_transform_internal(bool p_absolute_position = false) const override;
virtual Transform2D get_popup_base_transform() const override;
virtual bool is_directly_attached_to_screen() const override;
virtual Viewport *get_section_root_viewport() const override;
virtual bool is_attached_in_viewport() const override;
Rect2i get_parent_rect() const;