88 lines
1.9 KiB
Go
88 lines
1.9 KiB
Go
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package widget
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import (
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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/internal/widget"
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"fyne.io/fyne/v2/theme"
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)
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type iconRenderer struct {
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widget.BaseRenderer
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raster *canvas.Image
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image *Icon
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}
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func (i *iconRenderer) MinSize() fyne.Size {
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return fyne.NewSquareSize(theme.IconInlineSize())
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}
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func (i *iconRenderer) Layout(size fyne.Size) {
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if len(i.Objects()) == 0 {
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return
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}
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i.Objects()[0].Resize(size)
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}
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func (i *iconRenderer) Refresh() {
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if i.image.Resource == i.image.cachedRes {
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return
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}
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i.image.propertyLock.RLock()
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i.raster.Resource = i.image.Resource
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i.image.cachedRes = i.image.Resource
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if i.image.Resource == nil {
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i.raster.Image = nil // reset the internal caching too...
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}
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i.image.propertyLock.RUnlock()
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i.raster.Refresh()
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}
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// Icon widget is a basic image component that load's its resource to match the theme.
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type Icon struct {
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BaseWidget
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Resource fyne.Resource // The resource for this icon
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cachedRes fyne.Resource
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}
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// SetResource updates the resource rendered in this icon widget
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func (i *Icon) SetResource(res fyne.Resource) {
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i.Resource = res
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i.Refresh()
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}
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// MinSize returns the size that this widget should not shrink below
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func (i *Icon) MinSize() fyne.Size {
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i.ExtendBaseWidget(i)
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return i.BaseWidget.MinSize()
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}
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// CreateRenderer is a private method to Fyne which links this widget to its renderer
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func (i *Icon) CreateRenderer() fyne.WidgetRenderer {
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i.ExtendBaseWidget(i)
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i.propertyLock.RLock()
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defer i.propertyLock.RUnlock()
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img := canvas.NewImageFromResource(i.Resource)
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img.FillMode = canvas.ImageFillContain
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r := &iconRenderer{image: i, raster: img}
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r.SetObjects([]fyne.CanvasObject{img})
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i.cachedRes = i.Resource
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return r
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}
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// NewIcon returns a new icon widget that displays a themed icon resource
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func NewIcon(res fyne.Resource) *Icon {
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icon := &Icon{}
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icon.ExtendBaseWidget(icon)
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icon.SetResource(res) // force the image conversion
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return icon
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}
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