func (c *ColorPicker) SetColor(color nanovgo.Color) {
if !c.pushed {
fgColor := color.ContrastingColor()
c.SetBackgroundColor(color)
c.SetTextColor(fgColor)
c.colorWheel.SetColor(color)
c.pickButton.SetBackgroundColor(color)
c.pickButton.SetTextColor(fgColor)
}
}
func NewColorPicker(parent Widget, colors ...nanovgo.Color) *ColorPicker {
var color nanovgo.Color
switch len(colors) {
case 0:
color = nanovgo.RGBAf(1.0, 0.0, 0.0, 1.0)
case 1:
color = colors[0]
default:
panic("NewColorPicker can accept only one extra parameter (color)")
}
colorPicker := &ColorPicker{}
// init PopupButton member
colorPicker.chevronIcon = IconRightOpen
colorPicker.SetIconPosition(ButtonIconLeftCentered)
colorPicker.SetFlags(ToggleButtonType | PopupButtonType)
parentWindow := parent.FindWindow()
colorPicker.popup = NewPopup(parentWindow.Parent(), parentWindow)
colorPicker.popup.panel.SetLayout(NewGroupLayout())
colorPicker.colorWheel = NewColorWheel(colorPicker.popup.panel)
colorPicker.pickButton = NewButton(colorPicker.popup.panel, "Pick")
colorPicker.pickButton.SetFixedSize(100, 25)
InitWidget(colorPicker, parent)
colorPicker.SetColor(color)
colorPicker.PopupButton.SetChangeCallback(func(flag bool) {
colorPicker.SetColor(colorPicker.BackgroundColor())
if colorPicker.callback != nil {
colorPicker.callback(colorPicker.BackgroundColor())
}
})
colorPicker.colorWheel.SetCallback(func(color nanovgo.Color) {
colorPicker.pickButton.SetBackgroundColor(color)
colorPicker.pickButton.SetTextColor(color.ContrastingColor())
})
colorPicker.pickButton.SetCallback(func() {
color := colorPicker.colorWheel.Color()
colorPicker.SetPushed(false)
colorPicker.SetColor(color)
if colorPicker.callback != nil {
colorPicker.callback(colorPicker.BackgroundColor())
}
})
return colorPicker
}
func (c *ColorWheel) SetColor(color nanovgo.Color) {
c.hue, c.saturation, c.lightness, _ = color.HSLA()
c.calculatePosition()
}
func (b *Button) Draw(self Widget, ctx *nanovgo.Context) {
b.WidgetImplement.Draw(self, ctx)
bx := float32(b.x)
by := float32(b.y)
bw := float32(b.w)
bh := float32(b.h)
var gradTop nanovgo.Color
var gradBot nanovgo.Color
if b.pushed {
gradTop = b.theme.ButtonGradientTopPushed
gradBot = b.theme.ButtonGradientBotPushed
} else if b.mouseFocus && b.enabled {
gradTop = b.theme.ButtonGradientTopFocused
gradBot = b.theme.ButtonGradientBotFocused
} else {
gradTop = b.theme.ButtonGradientTopUnfocused
gradBot = b.theme.ButtonGradientBotUnfocused
}
ctx.BeginPath()
ctx.RoundedRect(bx+1.0, by+1.0, bw-2.0, bh-2.0, float32(b.theme.ButtonCornerRadius-1))
if b.backgroundColor.A != 0.0 {
bgColor := b.backgroundColor
bgColor.A = 1.0
ctx.SetFillColor(bgColor)
ctx.Fill()
if b.pushed {
gradTop.A = 0.8
gradBot.A = 0.8
} else {
a := 1 - b.backgroundColor.A
if !b.enabled {
a = a*0.5 + 0.5
}
gradTop.A = a
gradBot.A = a
}
}
bg := nanovgo.LinearGradient(bx, by, bx, by+bh, gradTop, gradBot)
ctx.SetFillPaint(bg)
ctx.Fill()
ctx.BeginPath()
var pOff float32 = 0.0
if b.pushed {
pOff = 1.0
}
ctx.RoundedRect(bx+0.5, by+1.5-pOff, bw-1.0, bh-2+pOff, float32(b.theme.ButtonCornerRadius))
ctx.SetStrokeColor(b.theme.BorderLight)
ctx.Stroke()
ctx.BeginPath()
ctx.RoundedRect(bx+0.5, by+0.5, bw-1.0, bh-2, float32(b.theme.ButtonCornerRadius))
ctx.SetStrokeColor(b.theme.BorderDark)
ctx.Stroke()
fontSize := float32(b.FontSize())
ctx.SetFontSize(fontSize)
ctx.SetFontFace(b.theme.FontBold)
caption := b.caption
tw, _ := ctx.TextBounds(0, 0, caption)
centerX := bx + bw*0.5
centerY := by + bh*0.5
textPosX := centerX - tw*0.5
textPosY := centerY - 1.0
textColor := b.TextColor()
if b.icon > 0 || b.imageIcon > 0 {
var iw, ih float32
if b.icon > 0 {
ih = fontSize * 1.5 / 2
ctx.SetFontSize(ih)
ctx.SetFontFace(b.theme.FontIcons)
iw, _ = ctx.TextBounds(0, 0, string([]rune{rune(b.icon)}))
} else if b.imageIcon > 0 {
ih = fontSize * 0.9
w, h, _ := ctx.ImageSize(b.imageIcon)
iw = float32(w) * ih / float32(h)
}
if b.caption != "" {
iw += float32(b.h) * 0.15
}
ctx.SetFillColor(textColor)
ctx.SetTextAlign(nanovgo.AlignLeft | nanovgo.AlignMiddle)
iconPosX := centerX
iconPosY := centerY - 1
switch b.iconPosition {
case ButtonIconLeftCentered:
iconPosX -= (tw + iw) * 0.5
textPosX += iw * 0.5
case ButtonIconRightCentered:
iconPosX -= iw * 0.5
textPosX += tw * 0.5
case ButtonIconLeft:
iconPosX = bx + 8.0
case ButtonIconRight:
iconPosX = bx + bw - iw - 8
}
if b.icon > 0 {
ctx.TextRune(iconPosX, iconPosY, []rune{rune(b.icon)})
} else {
var eOff float32 = 0.25
if b.enabled {
eOff = 0.5
}
imgPaint := nanovgo.ImagePattern(iconPosX, iconPosY-ih*0.5, iw, ih, 0, b.imageIcon, eOff)
ctx.SetFillPaint(imgPaint)
ctx.Fill()
}
}
ctx.SetFontSize(fontSize)
ctx.SetFontFace(b.theme.FontBold)
ctx.SetTextAlign(nanovgo.AlignLeft | nanovgo.AlignMiddle)
ctx.SetFillColor(b.theme.TextColorShadow)
ctx.Text(textPosX, textPosY, caption)
ctx.SetFillColor(textColor)
ctx.Text(textPosX, textPosY+1.0, caption)
}