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https://git.sr.ht/~eliasnaur/gio
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Elias Naur
32aae18293
To keep the interface slim, remove the helper methods and shorten the essential method, Pixels, to Px. Add and use unexported Config implementation in the app package. Signed-off-by: Elias Naur <mail@eliasnaur.com>
52 lines
1.2 KiB
Go
52 lines
1.2 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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"gioui.org/ui"
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"gioui.org/ui/draw"
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"gioui.org/ui/f32"
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"gioui.org/ui/layout"
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)
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type Image struct {
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// Src is the image to display.
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Src image.Image
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// Rect is the source rectangle.
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Rect image.Rectangle
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// Scale is the ratio of image pixels to
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// device pixels. If zero, a scale that
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// makes the image appear at approximately
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// 72 DPI is used.
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Scale float32
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}
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func (im Image) Layout(c ui.Config, ops *ui.Ops, cs layout.Constraints) layout.Dimens {
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size := im.Src.Bounds()
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wf, hf := float32(size.Dx()), float32(size.Dy())
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var w, h int
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if im.Scale == 0 {
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const dpPrPx = 160 / 72
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w, h = c.Px(ui.Dp(wf*dpPrPx)), c.Px(ui.Dp(hf*dpPrPx))
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} else {
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w, h = int(wf*im.Scale+.5), int(hf*im.Scale+.5)
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}
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d := image.Point{X: cs.Width.Constrain(w), Y: cs.Height.Constrain(h)}
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aspect := float32(w) / float32(h)
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dw, dh := float32(d.X), float32(d.Y)
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dAspect := dw / dh
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if aspect < dAspect {
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d.X = int(dh*aspect + 0.5)
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} else {
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d.Y = int(dw/aspect + 0.5)
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}
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dr := f32.Rectangle{
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Max: f32.Point{X: float32(d.X), Y: float32(d.Y)},
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}
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draw.ImageOp{Img: im.Src, Rect: im.Rect}.Add(ops)
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draw.DrawOp{Rect: dr}.Add(ops)
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return layout.Dimens{Size: d, Baseline: d.Y}
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}
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