89 lines
1.8 KiB
Go
89 lines
1.8 KiB
Go
package zenity
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import (
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"image/color"
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"sync"
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"unsafe"
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)
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var (
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chooseColor = comdlg32.NewProc("ChooseColorW")
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savedColors [16]uint32
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colorsMutex sync.Mutex
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)
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func init() {
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for i := range savedColors {
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savedColors[i] = 0xffffff
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}
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}
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const (
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_CC_RGBINIT = 0x00000001
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_CC_FULLOPEN = 0x00000002
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_CC_PREVENTFULLOPEN = 0x00000004
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)
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func selectColor(opts options) (color.Color, error) {
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// load custom colors
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colorsMutex.Lock()
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customColors := savedColors
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colorsMutex.Unlock()
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var args _CHOOSECOLOR
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args.StructSize = uint32(unsafe.Sizeof(args))
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args.CustColors = &customColors
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if opts.color != nil {
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args.Flags |= _CC_RGBINIT
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n := color.NRGBAModel.Convert(opts.color).(color.NRGBA)
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args.RgbResult = uint32(n.R) | uint32(n.G)<<8 | uint32(n.B)<<16
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}
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if opts.showPalette {
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args.Flags |= _CC_PREVENTFULLOPEN
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} else {
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args.Flags |= _CC_FULLOPEN
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}
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defer setup()()
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if opts.ctx != nil || opts.title != nil {
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unhook, err := hookDialogTitle(opts.ctx, opts.title)
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if err != nil {
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return nil, err
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}
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defer unhook()
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}
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s, _, _ := chooseColor.Call(uintptr(unsafe.Pointer(&args)))
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if opts.ctx != nil && opts.ctx.Err() != nil {
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return nil, opts.ctx.Err()
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}
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if s == 0 {
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return nil, commDlgError()
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}
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// save custom colors back
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colorsMutex.Lock()
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savedColors = customColors
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colorsMutex.Unlock()
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r := uint8(args.RgbResult >> 0)
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g := uint8(args.RgbResult >> 8)
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b := uint8(args.RgbResult >> 16)
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return color.RGBA{R: r, G: g, B: b, A: 255}, nil
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}
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// https://docs.microsoft.com/en-us/windows/win32/api/commdlg/ns-commdlg-choosecolorw-r1
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type _CHOOSECOLOR struct {
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StructSize uint32
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Owner uintptr
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Instance uintptr
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RgbResult uint32
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CustColors *[16]uint32
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Flags uint32
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CustData uintptr
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FnHook uintptr
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TemplateName *uint16
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}
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