87 lines
2.4 KiB
Go
87 lines
2.4 KiB
Go
package mujica
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import (
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"log/slog"
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"time"
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"github.com/egoist/mygo/ui"
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"mujicaui/theme"
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)
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// TooltipOptions configure a Tooltip.
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type TooltipOptions struct {
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// Delay is how long hover or focus rests before the tip shows: 500 ms when zero.
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Delay time.Duration
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}
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// tooltipState tracks when the anchor became hot and whether Escape hid the tip.
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type tooltipState struct {
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since time.Time
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dismissed bool
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}
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const tooltipMaxWidth = 240
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// Tooltip shows text near anchor once the pointer rests on it or it has
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// the keyboard focus. The tip holds no interactive content, passes the
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// pointer through, stays in the window and hides on leave, blur or Escape.
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// It also describes anchor to assistive technology.
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func Tooltip(c *ui.Context, anchor *ui.Element, text string, opts TooltipOptions) *ui.Element {
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if anchor == nil {
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panic("mujica: Tooltip needs an anchor")
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}
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if opts.Delay < 0 {
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panic("mujica: Tooltip Delay is negative")
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}
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if text == "" {
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return anchor
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}
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anchor.Description(text)
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st := ui.Local(anchor, "mujica.tooltip", func() tooltipState { return tooltipState{} })
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hot := anchor.Hovered() || anchor.FocusVisible()
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if !hot {
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st.since, st.dismissed = time.Time{}, false
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return anchor
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}
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if st.dismissed {
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return anchor
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}
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if st.since.IsZero() {
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st.since = c.Now()
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}
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delay := opts.Delay
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if delay == 0 {
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delay = 500 * time.Millisecond
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}
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if wait := delay - c.Now().Sub(st.since); wait > 0 {
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c.After(wait)
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return anchor
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}
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if c.Shortcut(0, ui.KeyEscape) {
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slog.Debug("mujica: tooltip dismiss")
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st.dismissed = true
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return anchor
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}
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tooltipShow(c, anchor.Bounds(), text)
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return anchor
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}
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// tooltipShow draws the tip below a, or above it when there is no room.
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func tooltipShow(c *ui.Context, a ui.Rect, text string) {
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k := Tokens(c)
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u := Density(c).Unit()
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size := theme.CaptionSize + 1
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tw, th := c.MeasureText(tooltipMaxWidth, ui.Span{Text: text, Size: size, Font: c.Theme().Font})
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padX, padY := u*2.5, u*1.5
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w, h := tw+2*(padX+theme.BorderWidth)+1, th+2*(padY+theme.BorderWidth)
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x, y := overlayPlace(c, ui.Rect{X: a.X + a.W/2 - w/2, Y: a.Y, W: w, H: a.H}, w, h, 6)
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ui.Overlay(c, func() {
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ui.Box(c).Absolute().Left(x).Top(y).Width(w).Padding(padY, padX).Radius(theme.ControlRadius).
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Background(k.Text).TextColor(k.Background).Border(theme.BorderWidth, k.Text).
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PassThrough().Role(ui.RoleTooltip).Children(func() {
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ui.Text(c, text).FontSize(size)
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})
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})
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}
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