65 lines
1.7 KiB
Go
65 lines
1.7 KiB
Go
package mujica
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import (
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"github.com/egoist/mygo/ui"
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"mujicaui/internal"
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"mujicaui/theme"
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)
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// HeadingOptions configure a Heading. The zero value is a level 1 heading.
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type HeadingOptions struct {
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// Level is 1, 2 or 3; zero means 1.
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Level int
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// Subtitle shows below the title in muted text.
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Subtitle string
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// Divider draws an ornament rule with a center diamond below.
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Divider bool
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}
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// Heading shows a serif title that follows the desktop's text scale.
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func Heading(c *ui.Context, title string, opts HeadingOptions) *ui.Element {
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k := Tokens(c)
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size := headingSize(opts.Level)
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scale := c.Preferences().TextScale
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if scale <= 0 {
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scale = 1
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}
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u := Density(c).Unit()
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col := ui.Column(c).Gap(u).Shrink(0)
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col.Children(func() {
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ui.Text(c, title).Font(theme.SerifFont).FontSize(size * scale).FontWeight(600).
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LineHeight(1.25).TextColor(k.Text)
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if opts.Subtitle != "" {
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ui.Text(c, opts.Subtitle).FontSize(theme.BodySize * scale).LineHeight(theme.LineHeight).TextColor(k.TextMuted)
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}
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if opts.Divider {
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ui.Box(c).FillWidth().Height(9).Margin(u, 0, 0, 0).Draw(func(p *ui.Painter, r ui.Rect) {
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headingOrnament(p, r, k.Ornament)
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})
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}
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})
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return col
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}
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func headingSize(level int) float32 {
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switch level {
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case 0, 1:
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return theme.H1Size
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case 2:
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return theme.H2Size
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case 3:
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return theme.H3Size
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}
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panic("mujica: Heading Level must be 1, 2 or 3")
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}
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// headingOrnament draws symmetric rules around a center diamond.
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func headingOrnament(p *ui.Painter, r ui.Rect, c ui.Color) {
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cx, cy := r.X+r.W/2, r.Y+r.H/2
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const d, gap = 7, 6
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internal.Rule(p, r.X, cx-gap, cy, c)
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internal.Rule(p, cx+gap, r.X+r.W, cy, c)
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p.FillPath(internal.Diamond(cx, cy, d), c)
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}
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