/
main.go
57 lines (47 loc) · 1.52 KB
/
main.go
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// SPDX-License-Identifier: Unlicense OR MIT
package main
import (
"gioui.org/font/gofont" // gofont is used for loading the default font.
"gioui.org/layout" // layout is used for layouting widgets.
"gioui.org/op/clip" // clip contains operations for clipping painting area.
"gioui.org/op/paint" // paint contains operations for coloring.
"gioui.org/widget/material" // material contains material design widgets.
"github.com/golangestonia/learn-gio/qapp" // qapp contains convenience funcs for this tutorial
)
var Theme = material.NewTheme(gofont.Collection())
func main() {
qapp.Layout(func(gtx layout.Context) layout.Dimensions {
return layout.Stack{
Alignment: layout.Center,
}.Layout(gtx,
layout.Expanded(func(gtx layout.Context) layout.Dimensions {
size := gtx.Constraints.Max
smallest := min(size.X, size.Y)
size.X, size.Y = smallest, smallest
shape := clip.Ellipse{Max: size}
paint.FillShape(gtx.Ops, Theme.ContrastBg, shape.Op(gtx.Ops))
return layout.Dimensions{
Size: size,
}
}),
layout.Stacked(func(gtx layout.Context) layout.Dimensions {
size := gtx.Constraints.Max
textSize := min(size.X, size.Y) * 3 / 4
if textSize > 1023 {
// There's a limit how large we can make the font.
textSize = 1023
}
label := material.H1(Theme, "P")
label.Color = Theme.ContrastFg
label.TextSize = gtx.Metric.PxToSp(textSize)
return label.Layout(gtx)
}),
)
})
}
func min(x, y int) int {
if x < y {
return x
}
return y
}