105 lines
2.1 KiB
Go
105 lines
2.1 KiB
Go
package tins2020
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import (
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"strings"
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"github.com/veandco/go-sdl2/sdl"
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)
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type Label struct {
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ControlBase
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FontColor sdl.Color
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FontName string
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Text string
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Alignment TextAlignment
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}
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func (l *Label) fontColor() sdl.Color {
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var none sdl.Color
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if l.FontColor == none {
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return MustHexColor("#ffffff")
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}
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return l.FontColor
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}
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func (l *Label) fontName() string {
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if len(l.FontName) == 0 {
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return "default"
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}
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return l.FontName
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}
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func (l *Label) Render(ctx *Context) {
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font := ctx.Fonts.Font(l.fontName())
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color := l.fontColor()
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bottom := l.Bounds.Y + l.Bounds.H
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switch l.Alignment {
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case TextAlignmentCenter:
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font.RenderCopyAlign(ctx.Renderer, l.Text, Pt(l.Bounds.X+l.Bounds.W/2, bottom), color, TextAlignmentCenter)
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case TextAlignmentLeft:
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font.RenderCopyAlign(ctx.Renderer, l.Text, Pt(l.Bounds.X, bottom), color, TextAlignmentLeft)
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case TextAlignmentRight:
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font.RenderCopyAlign(ctx.Renderer, l.Text, Pt(l.Bounds.X+l.Bounds.W, bottom), color, TextAlignmentRight)
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}
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}
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type Paragraph struct {
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Label
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}
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func (p *Paragraph) Render(ctx *Context) {
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font := ctx.Fonts.Font(p.fontName())
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color := p.fontColor()
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fontHeight := int32(font.Height())
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lines := strings.Split(p.Text, "\n")
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measure := func(s string) int32 {
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w, _, _ := font.SizeUTF8(s)
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return int32(w)
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}
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spaces := func(s string) []int {
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var spaces []int
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offset := 0
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for {
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space := strings.Index(s[offset:], " ")
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if space == -1 {
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return spaces
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}
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offset += space
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spaces = append(spaces, offset)
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offset++
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}
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}
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fit := func(s string) string {
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if measure(s) < p.Bounds.W {
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return s
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}
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spaces := spaces(s)
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for split := len(spaces) - 1; split >= 0; split-- {
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clipped := s[:spaces[split]]
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if measure(clipped) < p.Bounds.W {
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return clipped
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}
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}
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return s
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}
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offset := p.Bounds.Y
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for _, line := range lines {
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if len(line) == 0 {
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offset += fontHeight
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continue
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}
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for len(line) > 0 {
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offset += fontHeight
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clipped := fit(line)
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line = strings.TrimLeft(line[len(clipped):], " ")
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font.RenderCopy(ctx.Renderer, clipped, Pt(p.Bounds.X, offset), color)
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}
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}
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}
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