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https://git.sr.ht/~eliasnaur/gio
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Elias Naur
cb1e605203
In the early days of Gio, FrameEvent was part of package app. It was moved to package system to enable layout.NewContext be a convenient short-hand for constructing a layout. However, it seems the better design to leave FrameEvent (and Insets) in package app, and move layout.NewContext there as well. More importantly, the move allows us to replace the event.Queue interface with a concrete type. Signed-off-by: Elias Naur <mail@eliasnaur.com>
71 lines
2.0 KiB
Go
71 lines
2.0 KiB
Go
package material_test
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import (
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"image"
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"testing"
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"time"
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"gioui.org/app"
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"gioui.org/layout"
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"gioui.org/op"
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"gioui.org/unit"
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"gioui.org/widget"
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"gioui.org/widget/material"
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)
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func TestListAnchorStrategies(t *testing.T) {
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var ops op.Ops
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gtx := app.NewContext(&ops, app.FrameEvent{
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Metric: unit.Metric{
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PxPerDp: 1,
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PxPerSp: 1,
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},
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Now: time.Now(),
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Size: image.Point{
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X: 500,
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Y: 500,
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},
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})
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gtx.Constraints.Min = image.Point{}
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var spaceConstraints layout.Constraints
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space := func(gtx layout.Context, index int) layout.Dimensions {
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spaceConstraints = gtx.Constraints
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if spaceConstraints.Min.X < 0 || spaceConstraints.Min.Y < 0 ||
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spaceConstraints.Max.X < 0 || spaceConstraints.Max.Y < 0 {
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t.Errorf("invalid constraints at index %d: %#+v", index, spaceConstraints)
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}
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return layout.Dimensions{Size: image.Point{
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X: gtx.Constraints.Max.X,
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Y: gtx.Dp(20),
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}}
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}
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var list widget.List
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list.Axis = layout.Vertical
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elements := 100
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th := material.NewTheme()
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materialList := material.List(th, &list)
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indicatorWidth := gtx.Dp(materialList.Width())
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materialList.AnchorStrategy = material.Occupy
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occupyDims := materialList.Layout(gtx, elements, space)
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occupyConstraints := spaceConstraints
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materialList.AnchorStrategy = material.Overlay
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overlayDims := materialList.Layout(gtx, elements, space)
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overlayConstraints := spaceConstraints
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// Both anchor strategies should use all space available if their elements do.
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if occupyDims != overlayDims {
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t.Errorf("expected occupy dims (%v) to be equal to overlay dims (%v)", occupyDims, overlayDims)
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}
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// The overlay strategy should not reserve any space for the scroll indicator,
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// so the constraints that it presents to its elements should be larger than
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// those presented by the occupy strategy.
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if overlayConstraints.Max.X != occupyConstraints.Max.X+indicatorWidth {
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t.Errorf("overlay max width (%d) != occupy max width (%d) + indicator width (%d)",
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overlayConstraints.Max.X, occupyConstraints.Max.X, indicatorWidth)
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}
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}
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