etk/button.go

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package etk
import (
"image"
"code.rocketnine.space/tslocum/messeji"
"github.com/hajimehoshi/ebiten/v2"
)
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// Button is a clickable button.
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type Button struct {
*Box
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Label *messeji.TextField
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onSelected func() error
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}
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// NewButton returns a new Button widget.
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func NewButton(label string, onSelected func() error) *Button {
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textColor := Style.ButtonTextColor
if textColor.A == 0 {
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textColor = Style.TextColorDark
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}
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l := messeji.NewTextField(Style.TextFont, Style.TextFontMutex)
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l.SetText(label)
l.SetForegroundColor(textColor)
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l.SetBackgroundColor(transparent)
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l.SetHorizontal(messeji.AlignCenter)
l.SetVertical(messeji.AlignCenter)
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l.SetScrollBarVisible(false)
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return &Button{
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Box: NewBox(),
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Label: l,
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onSelected: onSelected,
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}
}
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// SetRect sets the position and size of the Button.
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func (b *Button) SetRect(r image.Rectangle) {
b.Box.rect = r
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b.Label.SetRect(r)
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}
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// HandleKeyboard is called when a keyboard event occurs.
func (b *Button) HandleKeyboard(ebiten.Key, rune) (handled bool, err error) {
return false, nil
}
// HandleMouse is called when a mouse event occurs.
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func (b *Button) HandleMouse(cursor image.Point, pressed bool, clicked bool) (handled bool, err error) {
if !clicked {
return true, nil
}
b.Lock()
onSelected := b.onSelected
if onSelected == nil {
b.Unlock()
return true, nil
}
b.Unlock()
return true, onSelected()
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}
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// Draw draws the button on the screen.
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func (b *Button) Draw(screen *ebiten.Image) error {
// TODO background color
// Draw background.
screen.SubImage(b.rect).(*ebiten.Image).Fill(Style.ButtonBgColor)
// Draw label.
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b.Label.Draw(screen)
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// Draw border.
const borderSize = 4
screen.SubImage(image.Rect(b.rect.Min.X, b.rect.Min.Y, b.rect.Max.X, b.rect.Min.Y+borderSize)).(*ebiten.Image).Fill(Style.BorderColor)
screen.SubImage(image.Rect(b.rect.Min.X, b.rect.Max.Y-borderSize, b.rect.Max.X, b.rect.Max.Y)).(*ebiten.Image).Fill(Style.BorderColor)
screen.SubImage(image.Rect(b.rect.Min.X, b.rect.Min.Y, b.rect.Min.X+borderSize, b.rect.Max.Y)).(*ebiten.Image).Fill(Style.BorderColor)
screen.SubImage(image.Rect(b.rect.Max.X-borderSize, b.rect.Min.Y, b.rect.Max.X, b.rect.Max.Y)).(*ebiten.Image).Fill(Style.BorderColor)
return nil
}