forked from joejulian/gio
Elias Naur
6e9bb7b91c
Icons are meant to be shared among multiple widgets, but their Color state may end up with unexpected values after use. Replace the state with and explicit argument to Layout. Signed-off-by: Elias Naur <mail@eliasnaur.com>
75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package widget
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import (
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"image"
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"image/color"
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"image/draw"
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"gioui.org/internal/f32color"
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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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"golang.org/x/exp/shiny/iconvg"
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)
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type Icon struct {
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src []byte
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// Cached values.
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op paint.ImageOp
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imgSize int
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imgColor color.NRGBA
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}
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var defaultIconSize = unit.Dp(24)
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// NewIcon returns a new Icon from IconVG data.
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func NewIcon(data []byte) (*Icon, error) {
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_, err := iconvg.DecodeMetadata(data)
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if err != nil {
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return nil, err
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}
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return &Icon{src: data}, nil
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}
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// Layout displays the icon with its size set to the X minimum constraint.
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func (ic *Icon) Layout(gtx layout.Context, color color.NRGBA) layout.Dimensions {
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sz := gtx.Constraints.Min.X
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if sz == 0 {
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sz = gtx.Metric.Px(defaultIconSize)
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}
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size := gtx.Constraints.Constrain(image.Pt(sz, sz))
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defer op.Save(gtx.Ops).Load()
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clip.Rect{Max: size}.Add(gtx.Ops)
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ico := ic.image(size.X, color)
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ico.Add(gtx.Ops)
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paint.PaintOp{}.Add(gtx.Ops)
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return layout.Dimensions{
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Size: ico.Size(),
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}
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}
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func (ic *Icon) image(sz int, color color.NRGBA) paint.ImageOp {
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if sz == ic.imgSize && color == ic.imgColor {
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return ic.op
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}
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m, _ := iconvg.DecodeMetadata(ic.src)
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dx, dy := m.ViewBox.AspectRatio()
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img := image.NewRGBA(image.Rectangle{Max: image.Point{X: sz, Y: int(float32(sz) * dy / dx)}})
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var ico iconvg.Rasterizer
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ico.SetDstImage(img, img.Bounds(), draw.Src)
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m.Palette[0] = f32color.NRGBAToLinearRGBA(color)
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iconvg.Decode(&ico, ic.src, &iconvg.DecodeOptions{
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Palette: &m.Palette,
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})
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ic.op = paint.NewImageOp(img)
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ic.imgSize = sz
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ic.imgColor = color
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return ic.op
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}
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