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ui/layout: add common state to Context

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Almost every layout and widget need the ui.Config for its environment,
an ui.Ops to store operations. Stateful widgets need an input.Queue
for events.

Add all these common objects to Context, greatly simplifying the
function signatures for Gio programs.

Fixes gio#33

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2019-09-24 21:10:35 +02:00
parent b928ee65f7
commit 2782436ffc
9 changed files with 157 additions and 156 deletions
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ui/text/label.go
+9 -9
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@@ -92,8 +92,8 @@ func (l *lineIterator) Next() (String, f32.Point, bool) {
return String{}, f32.Point{}, false
}
func (l Label) Layout(ops *ui.Ops, ctx *layout.Context) {
cs := ctx.Constraints
func (l Label) Layout(c *layout.Context) {
cs := c.Constraints
textLayout := l.Face.Layout(l.Text, LayoutOptions{MaxWidth: cs.Width.Max})
lines := textLayout.Lines
if max := l.MaxLines; max > 0 && len(lines) > max {
@@ -119,16 +119,16 @@ func (l Label) Layout(ops *ui.Ops, ctx *layout.Context) {
}
lclip := toRectF(clip).Sub(off)
var stack ui.StackOp
stack.Push(ops)
ui.TransformOp{}.Offset(off).Add(ops)
l.Face.Path(str).Add(ops)
stack.Push(c.Ops)
ui.TransformOp{}.Offset(off).Add(c.Ops)
l.Face.Path(str).Add(c.Ops)
// Set a default color in case the material is empty.
paint.ColorOp{Color: color.RGBA{A: 0xff}}.Add(ops)
l.Material.Add(ops)
paint.PaintOp{Rect: lclip}.Add(ops)
paint.ColorOp{Color: color.RGBA{A: 0xff}}.Add(c.Ops)
l.Material.Add(c.Ops)
paint.PaintOp{Rect: lclip}.Add(c.Ops)
stack.Pop()
}
ctx.Dimensions = dims
c.Dimensions = dims
}
func toRectF(r image.Rectangle) f32.Rectangle {