etk/button.go

160 lines
4.1 KiB
Go

package etk
import (
"image"
"image/color"
"code.rocket9labs.com/tslocum/etk/messeji"
"github.com/hajimehoshi/ebiten/v2"
"golang.org/x/image/font/sfnt"
)
// Button is a clickable button.
type Button struct {
*Box
field *messeji.TextField
borderSize int
borderTop color.RGBA
borderRight color.RGBA
borderBottom color.RGBA
borderLeft color.RGBA
onSelected func() error
pressed bool
}
// NewButton returns a new Button widget.
func NewButton(label string, onSelected func() error) *Button {
textColor := Style.ButtonTextColor
if textColor.A == 0 {
textColor = Style.TextColorDark
}
f := newText()
f.SetText(label)
f.SetForegroundColor(textColor)
f.SetHorizontal(messeji.AlignCenter)
f.SetVertical(messeji.AlignCenter)
f.SetScrollBarVisible(false)
b := &Button{
Box: NewBox(),
field: f,
onSelected: onSelected,
borderSize: Scale(Style.BorderSize),
borderTop: Style.BorderColorTop,
borderRight: Style.BorderColorRight,
borderBottom: Style.BorderColorBottom,
borderLeft: Style.BorderColorLeft,
}
b.SetBackground(Style.ButtonBgColor)
return b
}
// SetRect sets the position and size of the Button.
func (b *Button) SetRect(r image.Rectangle) {
b.Box.rect = r
b.field.SetRect(r)
for _, w := range b.children {
w.SetRect(r)
}
}
// SetBorderSize sets the size of the border around the button.
func (b *Button) SetBorderSize(size int) {
b.Lock()
defer b.Unlock()
b.borderSize = size
}
// SetBorderColors sets the color of the top, right, bottom and left border.
func (b *Button) SetBorderColors(top color.RGBA, right color.RGBA, bottom color.RGBA, left color.RGBA) {
b.Lock()
defer b.Unlock()
b.borderTop = top
b.borderRight = right
b.borderBottom = bottom
b.borderLeft = left
}
// Text returns the content of the text buffer.
func (b *Button) Text() string {
b.Lock()
defer b.Unlock()
return b.field.Text()
}
// SetText sets the text in the field.
func (b *Button) SetText(text string) {
b.Lock()
defer b.Unlock()
b.field.SetText(text)
}
// SetFont sets the font and text size of button label. Scaling is not applied.
func (b *Button) SetFont(fnt *sfnt.Font, size int) {
b.Lock()
defer b.Unlock()
b.field.SetFont(FontFace(fnt, size), fontMutex)
}
// 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.
func (b *Button) HandleMouse(cursor image.Point, pressed bool, clicked bool) (handled bool, err error) {
if !clicked {
if b.pressed && !pressed {
b.Lock()
b.pressed = false
b.background = Style.ButtonBgColor
b.Unlock()
}
return true, nil
}
b.Lock()
b.pressed = true
b.background = color.RGBA{uint8(float64(Style.ButtonBgColor.R) * 0.95), uint8(float64(Style.ButtonBgColor.G) * 0.95), uint8(float64(Style.ButtonBgColor.B) * 0.95), 255}
onSelected := b.onSelected
if onSelected == nil {
b.Unlock()
return true, nil
}
b.Unlock()
return true, onSelected()
}
// Draw draws the button on the screen.
func (b *Button) Draw(screen *ebiten.Image) error {
r := b.rect
// Draw label.
b.field.Draw(screen)
// Draw border.
if b.borderSize != 0 {
if !b.pressed {
screen.SubImage(image.Rect(r.Min.X, r.Min.Y, r.Min.X+b.borderSize, r.Max.Y)).(*ebiten.Image).Fill(b.borderLeft)
screen.SubImage(image.Rect(r.Min.X, r.Min.Y, r.Max.X, r.Min.Y+b.borderSize)).(*ebiten.Image).Fill(b.borderTop)
screen.SubImage(image.Rect(r.Max.X-b.borderSize, r.Min.Y, r.Max.X, r.Max.Y)).(*ebiten.Image).Fill(b.borderRight)
screen.SubImage(image.Rect(r.Min.X, r.Max.Y-b.borderSize, r.Max.X, r.Max.Y)).(*ebiten.Image).Fill(b.borderBottom)
} else {
screen.SubImage(image.Rect(r.Max.X-b.borderSize, r.Min.Y, r.Max.X, r.Max.Y)).(*ebiten.Image).Fill(b.borderLeft)
screen.SubImage(image.Rect(r.Min.X, r.Max.Y-b.borderSize, r.Max.X, r.Max.Y)).(*ebiten.Image).Fill(b.borderTop)
screen.SubImage(image.Rect(r.Min.X, r.Min.Y, r.Min.X+b.borderSize, r.Max.Y)).(*ebiten.Image).Fill(b.borderRight)
screen.SubImage(image.Rect(r.Min.X, r.Min.Y, r.Max.X, r.Min.Y+b.borderSize)).(*ebiten.Image).Fill(b.borderBottom)
}
}
return nil
}