94 lines
1.9 KiB
Go
94 lines
1.9 KiB
Go
package alui
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import (
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"opslag.de/schobers/allg5"
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"opslag.de/schobers/geom"
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)
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type Menu struct {
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Proxy
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panel *StackPanel
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active int
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buttons []*Button
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}
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func NewMenu() *Menu {
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m := &Menu{}
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m.Init()
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return m
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}
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func (m *Menu) Init() {
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m.panel = &StackPanel{Orientation: OrientationVertical}
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m.Proxy.Target = m.panel
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}
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func (m *Menu) Activate(i int) {
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if len(m.buttons) == 0 || i < 0 {
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return
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}
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m.active = i % len(m.buttons)
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}
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func (m *Menu) Add(text string, onClick func()) {
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idx := len(m.buttons)
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button := &Button{Text: text, TextAlign: allg5.AlignCenter}
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button.OnClick = onClick
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button.OnEnter = func() {
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m.updateActiveButton(idx)
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}
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if idx == 0 {
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button.Over = true
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}
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m.buttons = append(m.buttons, button)
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m.panel.Children = append(m.panel.Children, button)
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}
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func (m *Menu) Handle(e allg5.Event) {
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m.Proxy.Handle(e)
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if len(m.buttons) == 0 {
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return
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}
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switch e := e.(type) {
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case *allg5.KeyCharEvent:
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switch e.KeyCode {
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case allg5.KeyDown:
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m.updateActiveButton((m.active + 1) % len(m.buttons))
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case allg5.KeyUp:
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m.updateActiveButton((m.active + len(m.buttons) - 1) % len(m.buttons))
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case allg5.KeyEnter:
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if onClick := m.buttons[m.active].OnClick; onClick != nil {
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onClick()
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}
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}
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case *allg5.MouseMoveEvent:
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for i, btn := range m.buttons {
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if btn.Over {
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m.updateActiveButton(i)
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break
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}
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}
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m.updateActiveButton(m.active)
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}
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}
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func (m *Menu) Layout(ctx *Context, bounds geom.RectangleF32) {}
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func (m *Menu) Render(ctx *Context, bounds geom.RectangleF32) {
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menuHeight := m.Proxy.DesiredSize(ctx).Y
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width, center := bounds.Dx(), bounds.Center()
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menuBounds := geom.RectF32(.25*width, center.Y-.5*menuHeight, .75*width, center.Y+.5*menuHeight)
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m.Proxy.Layout(ctx, menuBounds)
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m.Proxy.Render(ctx, menuBounds)
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}
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func (m *Menu) updateActiveButton(active int) {
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m.active = active
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for i, btn := range m.buttons {
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btn.Over = i == m.active
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}
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}
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