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widget: [API] split text widget Update from Layout

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This commit introduces Update(gtx) functions for both Selectable and Editor, allowing their
state to be updated explicitly prior to layout. This completes the transition that allows all
Gio widgets to have their state updated ahead-of-time, ensuring that there is zero frame lag
between an input event and the widget response to that event.

Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>
This commit is contained in:
Chris Waldon
2023-11-10 14:59:06 -05:00
parent 9d89f7c8b1
commit 3fde0c0061
3 changed files with 22 additions and 19 deletions
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widget/selectable.go
+8 -2
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@@ -182,18 +182,24 @@ func (l *Selectable) Truncated() bool {
return l.text.Truncated()
}
// Update the state of the selectable in response to input events.
func (l *Selectable) Update(gtx layout.Context) {
l.initialize()
l.handleEvents(gtx)
}
// Layout clips to the dimensions of the selectable, updates the shaped text, configures input handling, and paints
// the text and selection rectangles. The provided textMaterial and selectionMaterial ops are used to set the
// paint material for the text and selection rectangles, respectively.
func (l *Selectable) Layout(gtx layout.Context, lt *text.Shaper, font font.Font, size unit.Sp, textMaterial, selectionMaterial op.CallOp) layout.Dimensions {
l.initialize()
l.Update(gtx)
l.text.LineHeight = l.LineHeight
l.text.LineHeightScale = l.LineHeightScale
l.text.Alignment = l.Alignment
l.text.MaxLines = l.MaxLines
l.text.Truncator = l.Truncator
l.text.WrapPolicy = l.WrapPolicy
l.text.Update(gtx, lt, font, size, l.handleEvents)
l.text.Layout(gtx, lt, font, size)
dims := l.text.Dimensions()
defer clip.Rect(image.Rectangle{Max: dims.Size}).Push(gtx.Ops).Pop()
pointer.CursorText.Add(gtx.Ops)