Sander Schobers
3591e22c97
- Fonts are now managed by context instead of the implementation specific renderers.
135 lines
3.5 KiB
Go
135 lines
3.5 KiB
Go
package ui
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import (
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"opslag.de/schobers/geom"
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)
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type SelectedChangedFn func(selected bool)
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type Checkbox struct {
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ControlBase
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onSelectedChanged SelectedChangedFn
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Selected bool
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Text string
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}
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func BuildCheckbox(text string, fn func(c *Checkbox)) *Checkbox {
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var c = &Checkbox{Text: text}
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if fn != nil {
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fn(c)
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}
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return c
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}
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func (c *Checkbox) desiredSize(ctx Context) geom.PointF32 {
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var pad = ctx.Style().Dimensions.TextPadding
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var font = ctx.Fonts().Font(c.FontName(ctx))
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var w, h float32 = 0, font.Height()
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if len(c.Text) != 0 {
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w += pad + font.WidthOf(c.Text)
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}
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icon := c.getOrCreateNormalIcon(ctx)
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_, iconWidth := ScaleToHeight(SizeOfTexture(icon), h)
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w += pad + iconWidth
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return geom.PtF32(w+pad, pad+h+pad)
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}
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func (c *Checkbox) icon(ctx Context) Texture {
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if c.Selected {
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return GetOrCreateIcon(ctx, "ui-default-checkbox-selected", c.selectedIcon)
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} else if c.over {
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return GetOrCreateIcon(ctx, "ui-default-checkbox-hover", c.hoverIcon)
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}
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return c.getOrCreateNormalIcon(ctx)
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}
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func (c *Checkbox) getOrCreateNormalIcon(ctx Context) Texture {
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return GetOrCreateIcon(ctx, "ui-default-checkbox", c.normalIcon)
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}
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var checkBoxIconBorder = geom.PolF32(
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geom.PtF32(48, 80),
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geom.PtF32(400, 80),
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geom.PtF32(400, 432),
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geom.PtF32(48, 432),
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)
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var checkBoxCheckMark = geom.PointsF32{
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geom.PtF32(96, 256),
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geom.PtF32(180, 340),
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geom.PtF32(340, 150),
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}
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func (c *Checkbox) hoverIcon(pt geom.PointF32) bool {
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return (pt.DistanceToPolygon(checkBoxIconBorder) < 48 && !pt.InPolygon(checkBoxIconBorder)) || pt.DistanceToLines(checkBoxCheckMark) < 24
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}
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func (c *Checkbox) normalIcon(pt geom.PointF32) bool {
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return pt.DistanceToPolygon(checkBoxIconBorder) < 48 && !pt.InPolygon(checkBoxIconBorder)
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}
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func (c *Checkbox) selectedIcon(pt geom.PointF32) bool {
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if pt.DistanceToPolygon(checkBoxIconBorder) < 48 || pt.InPolygon(checkBoxIconBorder) {
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return pt.DistanceToLines(checkBoxCheckMark) > 24
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}
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return false
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}
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func (c *Checkbox) DesiredSize(ctx Context) geom.PointF32 { return c.desiredSize(ctx) }
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func (c *Checkbox) Handle(ctx Context, e Event) {
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switch e := e.(type) {
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case *MouseButtonDownEvent:
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if e.Button == MouseButtonLeft && c.over {
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c.Selected = !c.Selected
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onSelectedChanged := c.onSelectedChanged
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if onSelectedChanged != nil {
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onSelectedChanged(c.Selected)
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}
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}
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}
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c.ControlBase.Handle(ctx, e)
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if c.over {
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ctx.Renderer().SetMouseCursor(MouseCursorPointer)
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}
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}
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func (c *Checkbox) OnSelectedChanged(fn SelectedChangedFn) {
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c.onSelectedChanged = fn
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}
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func (c *Checkbox) Render(ctx Context) {
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c.RenderBackground(ctx)
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var style = ctx.Style()
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var palette = style.Palette
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fore := c.FontColor(ctx)
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bounds := c.bounds
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var pad = style.Dimensions.TextPadding
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bounds = bounds.Inset(pad)
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boundsH := bounds.Dy()
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pos := bounds.Min
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icon := c.icon(ctx)
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if icon != nil {
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iconColor := fore
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if c.Selected && c.Font.Color == nil {
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iconColor = palette.Primary
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}
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scaledIcon, _ := ctx.Textures().ScaledHeight(icon, boundsH) // try to pre-scale icon
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if scaledIcon == nil { // let the renderer scale
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scaledIcon = icon
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}
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scale, iconWidth := ScaleToHeight(SizeOfTexture(scaledIcon), boundsH)
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ctx.Renderer().DrawTextureOptions(scaledIcon, geom.PtF32(pos.X, pos.Y), DrawOptions{Tint: iconColor, Scale: scale})
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pos.X += iconWidth + pad
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}
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if len(c.Text) != 0 {
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var fontName = c.FontName(ctx)
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var font = ctx.Fonts().Font(fontName)
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ctx.Renderer().Text(font, geom.PtF32(pos.X, pos.Y+.5*(boundsH-font.Height())), fore, c.Text)
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}
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}
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