forked from joejulian/gio
Elias Naur
289fe02b90
We're about to reduce the scope of the Window.Queue by moving it to FrameEvent. As a consequence, Context can no longer rely on a Queue constant over its lifetime. Signed-off-by: Elias Naur <mail@eliasnaur.com>
123 lines
2.3 KiB
Go
123 lines
2.3 KiB
Go
package layout_test
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import (
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"fmt"
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"image"
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"gioui.org/layout"
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"gioui.org/unit"
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)
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func ExampleInset() {
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gtx := new(layout.Context)
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gtx.Reset(nil, nil, image.Point{X: 100, Y: 100})
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// Loose constraints with no minimal size.
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gtx.Constraints.Width.Min = 0
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gtx.Constraints.Height.Min = 0
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// Inset all edges by 10.
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inset := layout.UniformInset(unit.Dp(10))
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inset.Layout(gtx, func() {
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// Lay out a 50x50 sized widget.
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layoutWidget(gtx, 50, 50)
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fmt.Println(gtx.Dimensions.Size)
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})
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fmt.Println(gtx.Dimensions.Size)
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// Output:
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// (50,50)
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// (70,70)
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}
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func ExampleDirection() {
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gtx := new(layout.Context)
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// Rigid constraints with both minimum and maximum set.
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gtx.Reset(nil, nil, image.Point{X: 100, Y: 100})
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layout.Center.Layout(gtx, func() {
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// Lay out a 50x50 sized widget.
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layoutWidget(gtx, 50, 50)
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fmt.Println(gtx.Dimensions.Size)
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})
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fmt.Println(gtx.Dimensions.Size)
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// Output:
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// (50,50)
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// (100,100)
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}
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func ExampleFlex() {
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gtx := new(layout.Context)
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gtx.Reset(nil, nil, image.Point{X: 100, Y: 100})
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layout.Flex{}.Layout(gtx,
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// Rigid 10x10 widget.
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layout.Rigid(func() {
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fmt.Printf("Rigid: %v\n", gtx.Constraints.Width)
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layoutWidget(gtx, 10, 10)
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}),
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// Child with 50% space allowance.
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layout.Flexed(0.5, func() {
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fmt.Printf("50%%: %v\n", gtx.Constraints.Width)
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layoutWidget(gtx, 10, 10)
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}),
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)
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// Output:
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// Rigid: {0 100}
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// 50%: {45 45}
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}
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func ExampleStack() {
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gtx := new(layout.Context)
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gtx.Reset(nil, nil, image.Point{X: 100, Y: 100})
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gtx.Constraints.Width.Min = 0
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gtx.Constraints.Height.Min = 0
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layout.Stack{}.Layout(gtx,
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// Force widget to the same size as the second.
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layout.Expanded(func() {
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fmt.Printf("Expand: %v\n", gtx.Constraints)
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layoutWidget(gtx, 10, 10)
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}),
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// Rigid 50x50 widget.
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layout.Stacked(func() {
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layoutWidget(gtx, 50, 50)
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}),
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)
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// Output:
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// Expand: {{50 100} {50 100}}
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}
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func ExampleList() {
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gtx := new(layout.Context)
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gtx.Reset(nil, nil, image.Point{X: 100, Y: 100})
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// The list is 1e6 elements, but only 5 fit the constraints.
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const listLen = 1e6
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var list layout.List
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count := 0
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list.Layout(gtx, listLen, func(i int) {
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count++
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layoutWidget(gtx, 20, 20)
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})
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fmt.Println(count)
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// Output:
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// 5
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}
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func layoutWidget(ctx *layout.Context, width, height int) {
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ctx.Dimensions = layout.Dimensions{
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Size: image.Point{
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X: width,
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Y: height,
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},
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}
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}
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