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color_windows.go
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color_windows.go
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// +build windows,!linux,!darwin,!js
package dlgs
import (
"fmt"
"image/color"
"unsafe"
)
// Color displays a color selection dialog, returning the selected color and a bool for success.
func Color(title, defaultColorHex string) (color.Color, bool, error) {
c, ok := colorDialog(defaultColorHex)
if ok {
col := color.RGBA{}
col.R = byte(c & 0xff)
col.G = byte((c >> 8) & 0xff)
col.B = byte((c >> 16) & 0xff)
return col, true, nil
}
return nil, false, nil
}
// colorDialog displays color dialog.
func colorDialog(defaultColorHex string) (uint32, bool) {
var cc choosecolorW
custom := make([]uint32, 16)
cc.lpCustColors = &custom[0]
cc.lStructSize = uint32(unsafe.Sizeof(cc))
cc.flags = ccFullOpen | ccRgbInit
var r, g, b uint8
fmt.Sscanf(defaultColorHex, "#%02x%02x%02x", &r, &g, &b)
cc.rgbResult = uint32(uint32(r) | uint32(g)<<8 | uint32(b)<<16)
ok := chooseColor(&cc)
if ok {
return cc.rgbResult, true
}
return 0, false
}