99 lines
2.0 KiB
Go
99 lines
2.0 KiB
Go
package ui
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import (
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"git.kirsle.net/apps/doodle/render"
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"git.kirsle.net/apps/doodle/ui/theme"
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)
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// Button is a clickable button.
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type Button struct {
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BaseWidget
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Label Label
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Padding int32
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Border int32
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Outline int32
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// Color options.
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Background render.Color
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HighlightColor render.Color
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ShadowColor render.Color
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OutlineColor render.Color
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}
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// NewButton creates a new Button.
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func NewButton(label Label) *Button {
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return &Button{
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Label: label,
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Padding: 4, // TODO magic number
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Border: 2,
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Outline: 1,
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// Default theme colors.
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Background: theme.ButtonBackgroundColor,
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HighlightColor: theme.ButtonHighlightColor,
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ShadowColor: theme.ButtonShadowColor,
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OutlineColor: theme.ButtonOutlineColor,
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}
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}
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// SetText quickly changes the text of the label.
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func (w *Button) SetText(text string) {
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w.Label.Text.Text = text
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}
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// Compute the size of the button.
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func (w *Button) Compute(e render.Engine) {
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// Compute the size of the inner widget first.
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w.Label.Compute(e)
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size := w.Label.Size()
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w.Resize(render.Rect{
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W: size.W + (w.Padding * 2) + (w.Border * 2) + (w.Outline * 2),
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H: size.H + (w.Padding * 2) + (w.Border * 2) + (w.Outline * 2),
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})
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}
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// Present the button.
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func (w *Button) Present(e render.Engine) {
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w.Compute(e)
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P := w.Point()
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S := w.Size()
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box := render.Rect{
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X: P.X,
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Y: P.Y,
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W: S.W,
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H: S.H,
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}
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// Draw the outline layer as the full size of the widget.
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e.DrawBox(w.OutlineColor, render.Rect{
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X: P.X - w.Outline,
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Y: P.Y - w.Outline,
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W: S.W + (w.Outline * 2),
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H: S.H + (w.Outline * 2),
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})
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// Highlight on the top left edge.
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e.DrawBox(w.HighlightColor, box)
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box.W = S.W
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// Shadow on the bottom right edge.
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box.X += w.Border
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box.Y += w.Border
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box.W -= w.Border
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box.H -= w.Border
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e.DrawBox(w.ShadowColor, box)
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// Background color of the button.
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box.W -= w.Border
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box.H -= w.Border
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e.DrawBox(w.Background, box)
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// Draw the text label inside.
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w.Label.MoveTo(render.Point{
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X: P.X + w.Padding + w.Border + w.Outline,
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Y: P.Y + w.Padding + w.Border + w.Outline,
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})
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w.Label.Present(e)
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}
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