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color_preview.go
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color_preview.go
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package dialog
import (
"image/color"
"github.com/cheeryprogrammer/fyne/v2"
"github.com/cheeryprogrammer/fyne/v2/canvas"
internalwidget "github.com/cheeryprogrammer/fyne/v2/internal/widget"
"github.com/cheeryprogrammer/fyne/v2/widget"
)
// colorPreview displays a 2 part rectangle showing the current and previous selected colours
type colorPreview struct {
widget.BaseWidget
previous, current color.Color
}
func newColorPreview(previousColor color.Color) *colorPreview {
p := &colorPreview{previous: previousColor}
p.ExtendBaseWidget(p)
return p
}
// CreateRenderer is a private method to Fyne which links this widget to its renderer.
func (p *colorPreview) CreateRenderer() fyne.WidgetRenderer {
oldC := canvas.NewRectangle(p.previous)
newC := canvas.NewRectangle(p.current)
background := newCheckeredBackground(false)
return &colorPreviewRenderer{
BaseRenderer: internalwidget.NewBaseRenderer([]fyne.CanvasObject{background, oldC, newC}),
preview: p,
background: background,
old: oldC,
new: newC,
}
}
func (p *colorPreview) SetColor(c color.Color) {
p.current = c
p.Refresh()
}
func (p *colorPreview) MinSize() fyne.Size {
p.ExtendBaseWidget(p)
return p.BaseWidget.MinSize()
}
type colorPreviewRenderer struct {
internalwidget.BaseRenderer
preview *colorPreview
background *canvas.Raster
old, new *canvas.Rectangle
}
func (r *colorPreviewRenderer) Layout(size fyne.Size) {
s := fyne.NewSize(size.Width/2, size.Height)
r.background.Resize(size)
r.old.Resize(s)
r.new.Resize(s)
r.new.Move(fyne.NewPos(s.Width, 0))
}
func (r *colorPreviewRenderer) MinSize() fyne.Size {
s := r.old.MinSize()
s.Width *= 2
return s.Max(fyne.NewSize(16, 8))
}
func (r *colorPreviewRenderer) Refresh() {
r.background.Refresh()
r.old.FillColor = r.preview.previous
r.old.Refresh()
r.new.FillColor = r.preview.current
r.new.Refresh()
}