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package main
import (
"image"
"image/color"
"image/draw"
"github.com/faiface/gui"
)
func Button(env gui.Env, theme *Theme, text string, action func()) {
textImg := DrawText(text, theme.Face, theme.Text)
redraw := func(r image.Rectangle, over, pressed bool) func(draw.Image) image.Rectangle {
return func(drw draw.Image) image.Rectangle {
var clr color.Color
if pressed {
clr = theme.ButtonDown
} else if over {
clr = theme.ButtonOver
} else {
clr = theme.ButtonUp
}
draw.Draw(drw, r, &image.Uniform{clr}, image.ZP, draw.Src)
DrawCentered(drw, r, textImg, draw.Over)
return r
}
}
var (
r image.Rectangle
over bool
pressed bool
)
for e := range env.Events() {
var x, y, minX, minY, maxX, maxY int
switch {
case e.Matches("resize/%d/%d/%d/%d", &minX, &minY, &maxX, &maxY):
r = image.Rect(minX, minY, maxX, maxY)
env.Draw() <- redraw(r, over, pressed)
case e.Matches("mo/down/%d/%d/left", &x, &y):
newPressed := image.Pt(x, y).In(r)
if newPressed != pressed {
pressed = newPressed
env.Draw() <- redraw(r, over, pressed)
}
case e.Matches("mo/up/%d/%d/left", &x, &y):
if pressed {
if image.Pt(x, y).In(r) {
action()
}
pressed = false
env.Draw() <- redraw(r, over, pressed)
}
}
}
close(env.Draw())
}
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