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graph: Draw "fake" link during port drag-and-drop to visualize link creating

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Cursor movement during port drag-and-drop on the graph is now being tracked
and a link is drawn from the dragged port to the cursor.

If the cursor is hovering a port the source port can link to,
the second end of the link instead attaches to the ports link anchor
so that the link "snaps" to the linkable port.
This commit is contained in:
Tom A. Wagner
2023-08-04 13:46:09 +02:00
parent d99c5e253c
commit 7145c83ae1
2 changed files with 186 additions and 44 deletions
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6
src/ui/graph/port.rs
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@@ -119,6 +119,9 @@ mod imp {
let drag_src = gtk::DragSource::builder()
.content(&gdk::ContentProvider::for_value(&obj.to_value()))
.build();
// Override the default drag icon with an empty one so that only a grab cursor is shown.
// The graph will render a link from the source port to the cursor to visualize the drag instead.
drag_src.set_icon(Some(&gdk::Paintable::new_empty(0, 0)), 0, 0);
drag_src.connect_drag_begin(|drag_source, _| {
let port = drag_source
.widget()
@@ -126,9 +129,6 @@ mod imp {
.expect("Widget should be a Port");
log::trace!("Drag started from port {}", port.pipewire_id());
let paintable = gtk::WidgetPaintable::new(Some(&port));
drag_source.set_icon(Some(&paintable), 0, 0);
});
drag_src.connect_drag_cancel(|drag_source, _, _| {
let port = drag_source