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widget: adjust Draggable.Pos to be relative

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When dragging objects around an area, it is easier to
reason with the relative movement of the dragged item.

References: https://todo.sr.ht/~eliasnaur/gio/363
Signed-off-by: Pierre Curto <pierre.curto@gmail.com>
This commit is contained in:
Pierre Curto
2022-02-18 17:46:57 +01:00
committed by Elias Naur
parent 27762fdd46
commit 42ea56ac44
1 changed files with 3 additions and 4 deletions
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widget/dnd.go
+3 -4
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@@ -35,9 +35,8 @@ func (d *Draggable) Layout(gtx layout.Context, w, drag layout.Widget) layout.Dim
case pointer.Press: case pointer.Press:
d.click = ev.Position d.click = ev.Position
pos = f32.Point{} pos = f32.Point{}
case pointer.Drag: case pointer.Drag, pointer.Release:
pos = ev.Position.Sub(d.click) pos = ev.Position.Sub(d.click)
case pointer.Release:
} }
} }
d.pos = pos d.pos = pos
@@ -97,7 +96,7 @@ func (d *Draggable) Offer(ops *op.Ops, mime string, data io.ReadCloser) {
}.Add(ops) }.Add(ops)
} }
// Pos returns the drag position relative to its area. // Pos returns the drag position relative to its initial click position.
func (d *Draggable) Pos() f32.Point { func (d *Draggable) Pos() f32.Point {
return d.pos.Add(d.click) return d.pos
} }