141 lines
3.0 KiB
Go
141 lines
3.0 KiB
Go
package ui
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import (
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"image/color"
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"opslag.de/schobers/geom"
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)
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type Button struct {
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ControlBase
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Type ButtonType
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Text string
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Icon Image
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IconScale float32
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}
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type ButtonType int
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const (
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ButtonTypeContained ButtonType = iota
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ButtonTypeIcon
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ButtonTypeOutlined
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ButtonTypeText
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)
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func BuildButton(text string, fn func(b *Button)) *Button { return BuildIconButton(nil, text, fn) }
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func BuildIconButton(i Image, text string, fn func(b *Button)) *Button {
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var b = &Button{Text: text, Icon: i}
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if fn != nil {
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fn(b)
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}
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return b
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}
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func (b *Button) desiredSize(ctx Context) geom.PointF32 {
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var pad = ctx.Style().Dimensions.TextPadding
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var font = ctx.Renderer().Font(b.FontName(ctx))
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var w, h float32 = 0, font.Height()
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if len(b.Text) != 0 {
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w += pad + font.WidthOf(b.Text)
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}
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if b.Icon != nil && b.Icon.Height() > 0 {
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iconW := b.Icon.Width() * h / b.Icon.Height()
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if b.IconScale > 0 {
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iconW *= b.IconScale
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}
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w += pad + iconW
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}
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if w == 0 {
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return geom.ZeroPtF32
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}
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return geom.PtF32(w+pad, pad+h+pad)
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}
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func (b *Button) DesiredSize(ctx Context) geom.PointF32 {
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return b.desiredSize(ctx)
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}
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func (b *Button) Handle(ctx Context, e Event) {
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b.ControlBase.Handle(ctx, e)
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if b.over {
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ctx.Renderer().SetMouseCursor(MouseCursorPointer)
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}
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}
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func (b *Button) fillColor(p *Palette) color.Color {
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if b.Background != nil {
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return b.Background
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}
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if b.over {
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switch b.Type {
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case ButtonTypeContained:
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return p.PrimaryLight
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case ButtonTypeIcon:
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default:
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return p.PrimaryHighlight
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}
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}
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switch b.Type {
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case ButtonTypeContained:
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return p.Primary
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case ButtonTypeIcon:
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default:
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}
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return nil
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}
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func (b *Button) textColor(p *Palette) color.Color {
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if b.Font.Color != nil {
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return b.Font.Color
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}
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switch b.Type {
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case ButtonTypeContained:
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return p.TextOnPrimary
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case ButtonTypeIcon:
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if b.over {
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return p.Primary
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}
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return p.Text
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default:
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return p.Primary
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}
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}
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func (b *Button) Render(ctx Context) {
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var style = ctx.Style()
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var palette = style.Palette
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textColor := b.textColor(palette)
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fillColor := b.fillColor(palette)
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if fillColor != nil {
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ctx.Renderer().FillRectangle(b.bounds, fillColor)
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}
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size := b.desiredSize(ctx)
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bounds := b.bounds
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deltaX, deltaY := bounds.Dx()-size.X, bounds.Dy()-size.Y
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bounds.Min.X += .5 * deltaX
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bounds.Min.Y += .5 * deltaY
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var pad = style.Dimensions.TextPadding
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bounds = bounds.Inset(pad)
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pos := bounds.Min
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if b.Icon != nil && b.Icon.Height() > 0 {
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icon, _ := ctx.Images().ScaledHeight(b.Icon, b.IconScale*bounds.Dy())
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if icon != nil {
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ctx.Renderer().DrawImageOptions(icon, geom.PtF32(pos.X, pos.Y+.5*(bounds.Dy()-icon.Height())), DrawOptions{Tint: textColor})
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pos.X += icon.Width() + pad
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}
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}
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if len(b.Text) != 0 {
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var fontName = b.FontName(ctx)
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var font = ctx.Renderer().Font(fontName)
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ctx.Renderer().Text(geom.PtF32(pos.X, pos.Y+.5*(bounds.Dy()-font.Height())), fontName, textColor, b.Text)
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}
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if b.Type == ButtonTypeOutlined {
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ctx.Renderer().Rectangle(b.bounds, palette.TextDisabled, 1)
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}
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}
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