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imageplaceholder.go
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imageplaceholder.go
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package widgets
import (
"image"
"fyne.io/fyne/v2"
"fyne.io/fyne/v2/canvas"
"fyne.io/fyne/v2/container"
"fyne.io/fyne/v2/theme"
"fyne.io/fyne/v2/widget"
myTheme "github.com/dweymouth/supersonic/ui/theme"
)
// A widget that can display an image or else
// a placeholder with a rectangular border frame
// and an icon positioned in the center of the frame.
type ImagePlaceholder struct {
ScaleMode canvas.ImageScale
widget.BaseWidget
content *fyne.Container
imageDisp *TappableImage
image image.Image
iconImage *canvas.Image
border *myTheme.ThemedRectangle
minSize float32
OnTapped func(*fyne.PointEvent)
OnTappedSecondary func(*fyne.PointEvent)
}
func NewImagePlaceholder(centerIcon fyne.Resource, minSize float32) *ImagePlaceholder {
i := &ImagePlaceholder{minSize: minSize}
i.ExtendBaseWidget(i)
i.iconImage = canvas.NewImageFromResource(centerIcon)
i.iconImage.FillMode = canvas.ImageFillContain
i.iconImage.SetMinSize(fyne.NewSize(minSize/4, minSize/4))
i.imageDisp = NewTappableImage(i.onTapped)
i.imageDisp.OnTappedSecondary = i.onTappedSecondary
i.imageDisp.FillMode = canvas.ImageFillContain
i.imageDisp.Hidden = true
i.border = myTheme.NewThemedRectangle(theme.ColorNameBackground)
i.border.BorderColorName = theme.ColorNameForeground
i.border.BorderWidth = 3
i.content = container.NewMax(
i.border,
container.NewCenter(i.iconImage),
i.imageDisp,
)
return i
}
func (i *ImagePlaceholder) HaveImage() bool {
return i.image != nil
}
func (i *ImagePlaceholder) SetImage(img image.Image, tappable bool) {
i.image = img
if img != nil {
i.imageDisp.DisableTapping = !tappable
i.imageDisp.Image.Image = img
}
i.Refresh()
}
func (i *ImagePlaceholder) Image() image.Image {
return i.image
}
func (i *ImagePlaceholder) onTapped(e *fyne.PointEvent) {
if i.OnTapped != nil {
i.OnTapped(e)
}
}
func (i *ImagePlaceholder) onTappedSecondary(e *fyne.PointEvent) {
if i.OnTappedSecondary != nil {
i.OnTappedSecondary(e)
}
}
func (i *ImagePlaceholder) MinSize() fyne.Size {
return fyne.NewSize(i.minSize, i.minSize)
}
func (i *ImagePlaceholder) Refresh() {
i.border.Hidden = i.HaveImage()
i.iconImage.Hidden = i.HaveImage()
i.imageDisp.Hidden = !i.HaveImage()
i.imageDisp.ScaleMode = i.ScaleMode
i.iconImage.ScaleMode = i.ScaleMode
i.BaseWidget.Refresh()
}
func (i *ImagePlaceholder) CreateRenderer() fyne.WidgetRenderer {
return widget.NewSimpleRenderer(i.content)
}