forked from joejulian/gio
Elias Naur
7bf3265ccd
Instead of
type Contraints struct {
Width, Height Constraint
}
use
type Constraints struct {
Min, Max image.Point
}
which leads to simpler use. For example, the Min method is trivally replaced by
the field, and the RigidConstraints constructor is no longer a net win.
API Change. Rewrites:
gofmt -r 'gtx.Constraints.Min() -> gtx.Constraints.Min'
gofmt -r 'gtx.Constraints.Width.Min -> gtx.Constraints.Min.X'
gofmt -r 'gtx.Constraints.Height.Min -> gtx.Constraints.Min.Y'
gofmt -r 'gtx.Constraints.Height.Max -> gtx.Constraints.Max.Y'
gofmt -r 'gtx.Constraints.Width.Max -> gtx.Constraints.Max.X'
Signed-off-by: Elias Naur <mail@eliasnaur.com>
48 lines
1.1 KiB
Go
48 lines
1.1 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/f32"
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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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)
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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
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// dps. If Scale is zero Image falls back to
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// a scale that match a standard 72 DPI.
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Scale float32
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}
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func (im Image) Layout(gtx *layout.Context) {
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scale := im.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 := im.Src.Rect.Size()
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wf, hf := float32(size.X), float32(size.Y)
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w, h := gtx.Px(unit.Dp(wf*scale)), gtx.Px(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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var s op.StackOp
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s.Push(gtx.Ops)
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clip.Rect{Rect: f32.Rectangle{Max: toPointF(d)}}.Op(gtx.Ops).Add(gtx.Ops)
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im.Src.Add(gtx.Ops)
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paint.PaintOp{Rect: f32.Rectangle{Max: f32.Point{X: float32(w), Y: float32(h)}}}.Add(gtx.Ops)
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s.Pop()
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gtx.Dimensions = layout.Dimensions{Size: d}
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}
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func toPointF(p image.Point) f32.Point {
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return f32.Point{X: float32(p.X), Y: float32(p.Y)}
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}
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