85 lines
1.8 KiB
Go
85 lines
1.8 KiB
Go
package widgets
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import (
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"image"
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"image/color"
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"fyne.io/fyne/v2"
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"fyne.io/fyne/v2/canvas"
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"fyne.io/fyne/v2/container"
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"fyne.io/fyne/v2/theme"
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"fyne.io/fyne/v2/widget"
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)
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// A widget that can display an image or else
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// a placeholder with a rectangular border frame
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// and an icon positioned in the center of the frame.
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type ImagePlaceholder struct {
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widget.BaseWidget
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container *fyne.Container
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image image.Image
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minSize float32
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OnTapped func()
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}
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func NewImagePlaceholder(centerIcon fyne.Resource, minSize float32) *ImagePlaceholder {
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m := &ImagePlaceholder{minSize: minSize}
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m.ExtendBaseWidget(m)
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img := canvas.NewImageFromResource(centerIcon)
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img.FillMode = canvas.ImageFillContain
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img.SetMinSize(fyne.NewSize(minSize/4, minSize/4))
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rect := canvas.NewRectangle(theme.BackgroundColor())
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rect.StrokeColor = color.Black
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rect.StrokeWidth = 3
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rect.SetMinSize(fyne.NewSize(minSize, minSize))
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m.container = container.NewMax(
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rect,
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container.NewCenter(img),
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)
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return m
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}
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type CanvasImage interface {
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fyne.CanvasObject
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SetMinSize(fyne.Size)
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}
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func (i *ImagePlaceholder) HaveImage() bool {
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return i.image != nil
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}
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func (i *ImagePlaceholder) SetImage(img image.Image, tappable bool) {
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var cIm CanvasImage
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i.image = img
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if tappable {
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cImg := NewTappableImage(i.onTapped)
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cImg.Image.Image = img
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cImg.FillMode = canvas.ImageFillContain
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cIm = cImg
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} else {
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cImg := canvas.NewImageFromImage(img)
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cImg.FillMode = canvas.ImageFillContain
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cIm = cImg
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}
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cIm.SetMinSize(fyne.NewSize(i.minSize, i.minSize))
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i.container.RemoveAll()
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i.container.Add(cIm)
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i.container.Refresh()
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}
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func (i *ImagePlaceholder) Image() image.Image {
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return i.image
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}
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func (i *ImagePlaceholder) onTapped() {
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if i.OnTapped != nil {
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i.OnTapped()
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}
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}
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func (i *ImagePlaceholder) CreateRenderer() fyne.WidgetRenderer {
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return widget.NewSimpleRenderer(i.container)
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}
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