Color dialog (windows).

This commit is contained in:
Nuno Cruces 2020-01-18 12:40:16 +00:00
parent bb25804db0
commit 2acdf8ef7f
3 changed files with 112 additions and 0 deletions

20
color_test.go Normal file
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@ -0,0 +1,20 @@
package zenity_test
import (
"image/color"
"github.com/ncruces/zenity"
)
func ExampleSelectColor() {
zenity.SelectColor(
zenity.Color(color.RGBA{R: 0x66, G: 0x33, B: 0x99, A: 0xff}))
// Output:
}
func ExampleSelectColor_palette() {
zenity.SelectColor(
zenity.ShowPalette(),
zenity.Color(color.RGBA{R: 0x66, G: 0x33, B: 0x99, A: 0xff}))
// Output:
}

76
color_windows.go Normal file
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@ -0,0 +1,76 @@
package zenity
import (
"image/color"
"runtime"
"sync"
"unsafe"
)
var (
chooseColor = comdlg32.NewProc("ChooseColorW")
savedColors = [16]uint32{}
colorsMutex sync.Mutex
)
func init() {
for i := range savedColors {
savedColors[i] = 0xffffff
}
}
func SelectColor(options ...Option) (color.Color, error) {
opts := optsParse(options)
// load custom colors
colorsMutex.Lock()
customColors := savedColors
colorsMutex.Unlock()
var args _CHOOSECOLORW
args.StructSize = uint32(unsafe.Sizeof(args))
args.CustColors = &customColors
if opts.color != nil {
args.Flags |= 0x1 // CC_RGBINIT
r, g, b, _ := opts.color.RGBA()
args.RgbResult = (r >> 8 << 0) | (g >> 8 << 8) | (b >> 8 << 16)
}
if opts.palette {
args.Flags |= 4 // CC_PREVENTFULLOPEN
} else {
args.Flags |= 2 // CC_FULLOPEN
}
runtime.LockOSThread()
defer runtime.UnlockOSThread()
n, _, _ := chooseColor.Call(uintptr(unsafe.Pointer(&args)))
// save custom colors back
colorsMutex.Lock()
savedColors = customColors
colorsMutex.Unlock()
if n == 0 {
return nil, commDlgError()
}
r := uint8(args.RgbResult >> 0)
g := uint8(args.RgbResult >> 8)
b := uint8(args.RgbResult >> 16)
return color.RGBA{R: r, G: g, B: b, A: 255}, nil
}
type _CHOOSECOLORW struct {
StructSize uint32
Owner uintptr
Instance uintptr
RgbResult uint32
CustColors *[16]uint32
Flags uint32
CustData uintptr
FnHook uintptr
TemplateName *uint16
}

View file

@ -1,5 +1,7 @@
package zenity
import "image/color"
// Errors
type constError string
@ -24,6 +26,10 @@ type options struct {
hidden bool
filters []FileFilter
// Color selection options
color color.Color
palette bool
// Message options
icon MessageIcon
ok string
@ -104,6 +110,16 @@ func (f FileFilters) Build() Option {
return func(o *options) { o.filters = append(o.filters, f...) }
}
// Color selection options
func Color(c color.Color) Option {
return func(o *options) { o.color = c }
}
func ShowPalette() Option {
return func(o *options) { o.palette = true }
}
// Message options
// MessageIcon is the enumeration for message dialog icons.