forked from joejulian/gio
Elias Naur
116 lines
2.3 KiB
Go
116 lines
2.3 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package main
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import (
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"fmt"
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"image"
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"image/color"
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"log"
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"gioui.org/app"
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"gioui.org/f32"
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"gioui.org/io/system"
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"gioui.org/layout"
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"gioui.org/op/paint"
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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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"gioui.org/font/gofont"
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)
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func main() {
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go func() {
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w := app.NewWindow()
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if err := loop(w); err != nil {
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log.Fatal(err)
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}
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}()
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app.Main()
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}
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func loop(w *app.Window) error {
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gofont.Register()
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th := material.NewTheme()
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gtx := new(layout.Context)
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for {
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e := <-w.Events()
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switch e := e.(type) {
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case system.DestroyEvent:
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return e.Err
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case system.FrameEvent:
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gtx.Reset(e.Queue, e.Config, e.Size)
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drawTabs(gtx, th)
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e.Frame(gtx.Ops)
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}
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}
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}
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var tabs Tabs
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type Tabs struct {
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list layout.List
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tabs []Tab
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selected int
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}
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type Tab struct {
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btn widget.Clickable
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Title string
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}
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func init() {
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for i := 1; i <= 100; i++ {
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tabs.tabs = append(tabs.tabs,
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Tab{Title: fmt.Sprintf("Tab %d", i)},
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)
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}
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}
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func drawTabs(gtx *layout.Context, th *material.Theme) {
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layout.Flex{Axis: layout.Vertical}.Layout(gtx,
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layout.Rigid(func() {
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tabs.list.Layout(gtx, len(tabs.tabs), func(tabIdx int) {
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t := &tabs.tabs[tabIdx]
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if t.btn.Clicked(gtx) {
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tabs.selected = tabIdx
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}
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var tabWidth int
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layout.Stack{Alignment: layout.S}.Layout(gtx,
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layout.Stacked(func() {
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tabBtn := material.Button(th, t.Title)
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tabBtn.Background = color.RGBA{} // No background.
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tabBtn.CornerRadius = unit.Value{} // No corners.
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tabBtn.Color = color.RGBA{A: 0xff} // Black text.
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tabBtn.TextSize = unit.Sp(20)
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tabBtn.Layout(gtx, &t.btn)
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tabWidth = gtx.Dimensions.Size.X
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}),
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layout.Stacked(func() {
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if tabs.selected != tabIdx {
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return
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}
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paint.ColorOp{Color: th.Color.Primary}.Add(gtx.Ops)
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tabHeight := gtx.Px(unit.Dp(4))
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paint.PaintOp{Rect: f32.Rectangle{
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Max: f32.Point{
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X: float32(tabWidth),
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Y: float32(tabHeight),
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},
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}}.Add(gtx.Ops)
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gtx.Dimensions = layout.Dimensions{
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Size: image.Point{X: tabWidth, Y: tabHeight},
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}
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}),
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)
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})
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}),
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layout.Flexed(1, func() {
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layout.Center.Layout(gtx, func() {
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material.H1(th, fmt.Sprintf("Tab content #%d", tabs.selected)).Layout(gtx)
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})
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}),
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)
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}
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