134 lines
3.0 KiB
Go
134 lines
3.0 KiB
Go
package ui
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import (
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"fmt"
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"image"
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"image/color"
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"github.com/llgcode/draw2d/draw2dimg"
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"github.com/llgcode/draw2d/draw2dkit"
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"opslag.de/schobers/galleg/allegro5"
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"opslag.de/schobers/geom"
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)
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type CheckboxValueChangedFn func(bool)
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func createOnBitmap(fill, stroke color.Color) *allegro5.Bitmap {
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var sz = float64(checkboxSize)
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on := image.NewRGBA(image.Rect(0, 0, checkboxSize, checkboxSize))
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gc := draw2dimg.NewGraphicContext(on)
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gc.SetFillColor(color.Transparent)
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gc.Clear()
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gc.SetFillColor(fill)
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draw2dkit.RoundedRectangle(gc, 0, 0, sz, sz, 3, 3)
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gc.Fill()
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gc.SetStrokeColor(stroke)
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gc.SetLineWidth(2)
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gc.MoveTo(2.5, 5.5)
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gc.LineTo(5.5, 8.5)
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gc.LineTo(10, 3.5)
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gc.Stroke()
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bmp, err := allegro5.NewBitmapFromImage(on, false)
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if nil != err {
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return nil
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}
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return bmp
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}
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func createOffBitmap(fill, stroke color.Color) *allegro5.Bitmap {
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var sz = float64(checkboxSize)
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off := image.NewRGBA(image.Rect(0, 0, checkboxSize, checkboxSize))
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gc := draw2dimg.NewGraphicContext(off)
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gc.SetFillColor(color.Transparent)
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gc.Clear()
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gc.SetFillColor(stroke)
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draw2dkit.RoundedRectangle(gc, 0, 0, sz, sz, 4, 4)
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gc.Fill()
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gc.SetFillColor(fill)
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draw2dkit.RoundedRectangle(gc, 1, 1, sz-1, sz-1, 3, 3)
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gc.Fill()
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bmp, err := allegro5.NewBitmapFromImage(off, false)
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if nil != err {
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return nil
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}
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return bmp
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}
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type Checkbox struct {
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ControlBase
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Value bool
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Text string
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OnChanged CheckboxValueChangedFn
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on *allegro5.Bitmap
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off *allegro5.Bitmap
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}
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func (c *Checkbox) Created(ctx Context, p Container) error {
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var err = c.ControlBase.Created(ctx, p)
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if nil != err {
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return err
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}
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var plt = ctx.Palette()
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c.on = createOnBitmap(plt.Primary(), plt.White())
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c.off = createOffBitmap(plt.White(), plt.Black())
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if nil == c.on || nil == c.off {
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return fmt.Errorf("error creating checkboxes")
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}
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return nil
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}
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func (c *Checkbox) Handle(ctx Context, ev allegro5.Event) {
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var pressed = c.IsPressed
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c.ControlBase.Handle(ctx, ev)
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switch ev.(type) {
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case *allegro5.MouseButtonUpEvent:
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if !c.Disabled && pressed && c.IsOver {
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c.Value = !c.Value
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var onChanged = c.OnChanged
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if nil != onChanged {
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onChanged(c.Value)
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}
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}
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}
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}
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func (c *Checkbox) DesiredSize(ctx Context) geom.PointF {
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var fonts = ctx.Fonts()
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var fnt = fonts.Get("default")
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var w = fnt.TextWidth(c.Text)
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return geom.PtF(float64(w+2*leftMargin+checkboxSize), 24)
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}
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func (c *Checkbox) box() *allegro5.Bitmap {
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if c.Value {
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return c.on
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}
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return c.off
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}
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func (c *Checkbox) Render(ctx Context) {
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var fonts = ctx.Fonts()
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var min = c.Bounds.Min.To32()
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min = geom.PointF32{X: min.X + leftMargin, Y: min.Y + topMargin}
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var fnt = fonts.Get("default")
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var _, textY, _, textH = fnt.TextDims(c.Text)
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fnt.Draw(min.X+leftMargin+checkboxSize, min.Y-textY, ctx.Palette().Black(), allegro5.AlignLeft, c.Text)
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var checkboxTop = min.Y + textH - checkboxSize
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if c.Disabled {
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var disabled = ctx.Palette().Disabled()
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c.box().DrawOptions(min.X, checkboxTop, allegro5.DrawOptions{Tint: &disabled})
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} else {
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c.box().Draw(min.X, checkboxTop)
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}
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c.ControlBase.Render(ctx)
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}
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