52 lines
1.1 KiB
Go
52 lines
1.1 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package gel
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import (
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"image"
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"github.com/p9c/p9/pkg/gel/gio/layout"
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"github.com/p9c/p9/pkg/gel/gio/op/clip"
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"github.com/p9c/p9/pkg/gel/gio/op/paint"
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"github.com/p9c/p9/pkg/gel/gio/unit"
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)
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// Image is a widget that displays an image.
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type Image struct {
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// src is the image to display.
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src paint.ImageOp
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// scale is the ratio of image pixels to dps. If scale is zero Image falls back to a scale that match a standard 72
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// DPI.
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scale float32
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}
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func (th *Theme) Image() *Image {
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return &Image{}
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}
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func (i *Image) Src(img paint.ImageOp) *Image {
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i.src = img
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return i
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}
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func (i *Image) Scale(scale float32) *Image {
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i.scale = scale
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return i
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}
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func (i Image) Fn(gtx layout.Context) layout.Dimensions {
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scale := i.scale
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if scale == 0 {
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scale = 160.0 / 72.0
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}
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size := i.src.Size()
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wf, hf := float32(size.X), float32(size.Y)
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w, h := gtx.Dp(unit.Dp(wf*scale)), gtx.Dp(unit.Dp(hf*scale))
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cs := gtx.Constraints
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d := cs.Constrain(image.Pt(w, h))
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defer clip.Rect(image.Rectangle{Max: d}).Push(gtx.Ops).Pop()
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i.src.Add(gtx.Ops)
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paint.PaintOp{}.Add(gtx.Ops)
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return layout.Dimensions{Size: size}
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}
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