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io/system,widget/material: add decorations
Add the Decorations material widget and the related system elements in preparation for the automatic window decoration patch. Signed-off-by: Pierre Curto <pierre.curto@gmail.com>
This commit is contained in:
Pierre Curto
@@ -0,0 +1,297 @@
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package material
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import (
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"image"
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"image/color"
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"math/bits"
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"gioui.org/f32"
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"gioui.org/gesture"
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"gioui.org/io/pointer"
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"gioui.org/io/system"
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"gioui.org/layout"
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"gioui.org/op"
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"gioui.org/op/clip"
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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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)
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// DecorationsStyle provides the style elements for Decorations.
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type DecorationsStyle struct {
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Actions system.Action
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Title LabelStyle
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Background color.NRGBA
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Foreground color.NRGBA
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}
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// Decorate a window.
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func Decorate(th *Theme, actions system.Action) DecorationsStyle {
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titleStyle := Body1(th, "")
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titleStyle.Color = th.Palette.ContrastFg
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return DecorationsStyle{
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Actions: actions,
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Title: titleStyle,
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Background: th.Palette.ContrastBg,
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Foreground: th.Palette.ContrastFg,
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}
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}
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// Decorations provides window decorations.
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type Decorations struct {
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DecorationsStyle
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actions struct {
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layout.List
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clicks []widget.Clickable
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move gesture.Drag
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resize [8]struct {
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gesture.Hover
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gesture.Drag
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}
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}
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actioned system.Action
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path clip.Path
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maximized bool
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}
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// Decorate a window with the title and actions defined in DecorationsStyle.
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// The space used by the decorations is returned as an inset for the window
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// content.
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func (d *Decorations) Decorate(gtx layout.Context, title string) layout.Inset {
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rec := op.Record(gtx.Ops)
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dims := d.layoutDecorations(gtx, title)
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decos := rec.Stop()
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r := clip.Rect{Max: dims.Size}
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paint.FillShape(gtx.Ops, d.DecorationsStyle.Background, r.Op())
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decos.Add(gtx.Ops)
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d.layoutResizing(gtx)
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return layout.Inset{
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Top: unit.Px(float32(dims.Size.Y)),
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}
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}
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func (d *Decorations) layoutResizing(gtx layout.Context) {
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cs := gtx.Constraints.Min
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wh := gtx.Px(unit.Dp(10))
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s := []struct {
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system.Action
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image.Rectangle
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}{
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{system.ActionResizeNorth, image.Rect(0, 0, cs.X, wh)},
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{system.ActionResizeSouth, image.Rect(0, cs.Y-wh, cs.X, cs.Y)},
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{system.ActionResizeWest, image.Rect(cs.X-wh, 0, cs.X, cs.Y)},
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{system.ActionResizeEast, image.Rect(0, 0, wh, cs.Y)},
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{system.ActionResizeNorthWest, image.Rect(0, 0, wh, wh)},
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{system.ActionResizeSouthWest, image.Rect(cs.X-wh, 0, cs.X, wh)},
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{system.ActionResizeNorthEast, image.Rect(0, cs.Y-wh, wh, cs.Y)},
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{system.ActionResizeSouthEast, image.Rect(cs.X-wh, cs.Y-wh, cs.X, cs.Y)},
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}
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for i, data := range s {
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action := data.Action
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if d.DecorationsStyle.Actions&action == 0 {
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continue
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}
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rsz := &d.actions.resize[i]
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rsz.Events(gtx.Metric, gtx, gesture.Both)
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if rsz.Drag.Dragging() {
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d.actioned |= action
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}
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st := clip.Rect(data.Rectangle).Push(gtx.Ops)
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if rsz.Hover.Hovered(gtx) {
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pointer.CursorNameOp{Name: action.CursorName()}.Add(gtx.Ops)
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}
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rsz.Drag.Add(gtx.Ops)
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pass := pointer.PassOp{}.Push(gtx.Ops)
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rsz.Hover.Add(gtx.Ops)
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pass.Pop()
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st.Pop()
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}
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}
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func (d *Decorations) layoutDecorations(gtx layout.Context, title string) layout.Dimensions {
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gtx.Constraints.Min.Y = 0
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inset := layout.UniformInset(unit.Dp(10))
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return layout.Flex{
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Axis: layout.Horizontal,
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Alignment: layout.Middle,
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Spacing: layout.SpaceBetween,
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}.Layout(gtx,
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layout.Flexed(1, func(gtx layout.Context) layout.Dimensions {
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d.DecorationsStyle.Title.Text = title
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dims := inset.Layout(gtx, d.DecorationsStyle.Title.Layout)
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if d.DecorationsStyle.Actions&system.ActionMove != 0 {
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d.actions.move.Events(gtx.Metric, gtx, gesture.Both)
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st := clip.Rect{Max: dims.Size}.Push(gtx.Ops)
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d.actions.move.Add(gtx.Ops)
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if d.actions.move.Pressed() {
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d.actioned |= system.ActionMove
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}
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st.Pop()
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}
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return dims
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}),
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layout.Rigid(func(gtx layout.Context) layout.Dimensions {
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// Remove the unmaximize action as it is taken care of by maximize.
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actions := d.DecorationsStyle.Actions &^ system.ActionUnmaximize
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an := bits.OnesCount(uint(actions))
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if n := len(d.actions.clicks); n < an {
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d.actions.clicks = append(d.actions.clicks, make([]widget.Clickable, an-n)...)
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}
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return d.actions.Layout(gtx, an, func(gtx layout.Context, idx int) layout.Dimensions {
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action := system.Action(1 << idx)
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var w layout.Widget
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switch actions & action {
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case system.ActionMinimize:
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w = d.minimizeWindow
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case system.ActionMaximize:
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if d.maximized {
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w = d.maximizedWindow
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} else {
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w = d.maximizeWindow
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}
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case system.ActionClose:
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w = d.closeWindow
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default:
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return layout.Dimensions{}
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}
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click := &d.actions.clicks[idx]
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if click.Clicked() {
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if action == system.ActionMaximize {
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if d.maximized {
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d.maximized = false
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d.actioned |= system.ActionUnmaximize
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} else {
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d.maximized = true
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d.actioned |= system.ActionMaximize
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}
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} else {
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d.actioned |= action
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}
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}
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return Clickable(gtx, click, func(gtx layout.Context) layout.Dimensions {
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return inset.Layout(gtx, w)
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})
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})
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}),
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)
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}
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// Perform updates the decorations as if the specified actions were
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// performed by the user.
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func (d *Decorations) Perform(actions system.Action) {
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if actions&system.ActionMaximize != 0 {
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d.maximized = true
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}
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if actions&(system.ActionUnmaximize|system.ActionMinimize|system.ActionFullscreen) != 0 {
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d.maximized = false
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}
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}
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// Actions returns the set of actions activated by the user.
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func (d *Decorations) Actions() system.Action {
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a := d.actioned
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d.actioned = 0
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return a
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}
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var (
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winIconSize = unit.Dp(20)
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winIconMargin = unit.Dp(4)
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winIconStroke = unit.Dp(2)
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)
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// minimizeWindows draws a line icon representing the minimize action.
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func (d *Decorations) minimizeWindow(gtx layout.Context) layout.Dimensions {
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paint.ColorOp{Color: d.DecorationsStyle.Foreground}.Add(gtx.Ops)
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size := gtx.Px(winIconSize)
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size32 := float32(size)
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margin := float32(gtx.Px(winIconMargin))
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width := float32(gtx.Px(winIconStroke))
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p := &d.path
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p.Begin(gtx.Ops)
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p.MoveTo(f32.Point{X: margin, Y: size32 - margin})
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p.LineTo(f32.Point{X: size32 - 2*margin, Y: size32 - margin})
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st := clip.Stroke{
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Path: p.End(),
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Width: width,
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}.Op().Push(gtx.Ops)
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paint.PaintOp{}.Add(gtx.Ops)
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st.Pop()
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return layout.Dimensions{Size: image.Pt(size, size)}
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}
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// maximizeWindow draws a rectangle representing the maximize action.
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func (d *Decorations) maximizeWindow(gtx layout.Context) layout.Dimensions {
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paint.ColorOp{Color: d.DecorationsStyle.Foreground}.Add(gtx.Ops)
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size := gtx.Px(winIconSize)
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size32 := float32(size)
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margin := float32(gtx.Px(winIconMargin))
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width := float32(gtx.Px(winIconStroke))
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r := clip.RRect{
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Rect: f32.Rect(margin, margin, size32-margin, size32-margin),
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}
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st := clip.Stroke{
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Path: r.Path(gtx.Ops),
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Width: width,
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}.Op().Push(gtx.Ops)
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paint.PaintOp{}.Add(gtx.Ops)
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st.Pop()
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r.Rect.Max = f32.Pt(size32-margin, 2*margin)
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st = clip.Outline{
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Path: r.Path(gtx.Ops),
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}.Op().Push(gtx.Ops)
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paint.PaintOp{}.Add(gtx.Ops)
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st.Pop()
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return layout.Dimensions{Size: image.Pt(size, size)}
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}
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// maximizedWindow draws interleaved rectangles representing the un-maximize action.
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func (d *Decorations) maximizedWindow(gtx layout.Context) layout.Dimensions {
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paint.ColorOp{Color: d.DecorationsStyle.Foreground}.Add(gtx.Ops)
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size := gtx.Px(winIconSize)
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size32 := float32(size)
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margin := float32(gtx.Px(winIconMargin))
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width := float32(gtx.Px(winIconStroke))
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r := clip.RRect{
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Rect: f32.Rect(margin, margin, size32-2*margin, size32-2*margin),
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}
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st := clip.Stroke{
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Path: r.Path(gtx.Ops),
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Width: width,
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}.Op().Push(gtx.Ops)
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paint.PaintOp{}.Add(gtx.Ops)
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st.Pop()
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r = clip.RRect{
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Rect: f32.Rect(2*margin, 2*margin, size32-margin, size32-margin),
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}
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st = clip.Stroke{
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Path: r.Path(gtx.Ops),
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Width: width,
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}.Op().Push(gtx.Ops)
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paint.PaintOp{}.Add(gtx.Ops)
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st.Pop()
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return layout.Dimensions{Size: image.Pt(size, size)}
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}
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// closeWindow draws a cross representing the close action.
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func (d *Decorations) closeWindow(gtx layout.Context) layout.Dimensions {
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paint.ColorOp{Color: d.DecorationsStyle.Foreground}.Add(gtx.Ops)
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size := gtx.Px(winIconSize)
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size32 := float32(size)
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margin := float32(gtx.Px(winIconMargin))
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width := float32(gtx.Px(winIconStroke))
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p := &d.path
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p.Begin(gtx.Ops)
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p.MoveTo(f32.Point{X: margin, Y: margin})
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p.LineTo(f32.Point{X: size32 - margin, Y: size32 - margin})
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p.MoveTo(f32.Point{X: size32 - margin, Y: margin})
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p.LineTo(f32.Point{X: margin, Y: size32 - margin})
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st := clip.Stroke{
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Path: p.End(),
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Width: width,
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}.Op().Push(gtx.Ops)
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paint.PaintOp{}.Add(gtx.Ops)
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st.Pop()
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return layout.Dimensions{Size: image.Pt(size, size)}
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}
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