zenity/msg_windows.go

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package zenity
import (
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"context"
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"syscall"
"unsafe"
)
var (
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messageBox = user32.NewProc("MessageBoxW")
getDlgCtrlID = user32.NewProc("GetDlgCtrlID")
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)
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func message(kind messageKind, text string, opts options) (bool, error) {
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var flags uintptr
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switch {
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case kind == questionKind && opts.extraButton != nil:
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flags |= 0x3 // MB_YESNOCANCEL
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case kind == questionKind:
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flags |= 0x1 // MB_OKCANCEL
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case opts.extraButton != nil:
flags |= 0x4 // MB_YESNO
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}
switch opts.icon {
case ErrorIcon:
flags |= 0x10 // MB_ICONERROR
case QuestionIcon:
flags |= 0x20 // MB_ICONQUESTION
case WarningIcon:
flags |= 0x30 // MB_ICONWARNING
case InfoIcon:
flags |= 0x40 // MB_ICONINFORMATION
}
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if kind == questionKind && opts.defaultCancel {
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if opts.extraButton == nil {
flags |= 0x100 // MB_DEFBUTTON2
} else {
flags |= 0x200 // MB_DEFBUTTON3
}
}
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defer setup()()
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if opts.ctx != nil || opts.okLabel != nil || opts.cancelLabel != nil || opts.extraButton != nil {
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unhook, err := hookMessageLabels(kind, opts)
if err != nil {
return false, err
}
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defer unhook()
}
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var title uintptr
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if opts.title != nil {
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title = strptr(*opts.title)
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}
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s, _, err := messageBox.Call(0, strptr(text), title, flags)
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if opts.ctx != nil && opts.ctx.Err() != nil {
return false, opts.ctx.Err()
}
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switch s {
case 1, 6: // IDOK, IDYES
return true, nil
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case 2: // IDCANCEL
return false, nil
case 7: // IDNO
return false, ErrExtraButton
default:
return false, err
}
}
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func hookMessageLabels(kind messageKind, opts options) (unhook context.CancelFunc, err error) {
return hookDialog(opts.ctx, func(wnd uintptr) {
enumChildWindows.Call(wnd,
syscall.NewCallback(func(wnd, lparam uintptr) uintptr {
name := [8]uint16{}
getClassName.Call(wnd, uintptr(unsafe.Pointer(&name)), uintptr(len(name)))
if syscall.UTF16ToString(name[:]) == "Button" {
ctl, _, _ := getDlgCtrlID.Call(wnd)
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var text *string
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switch ctl {
case 1, 6: // IDOK, IDYES
text = opts.okLabel
case 2: // IDCANCEL
if kind == questionKind {
text = opts.cancelLabel
} else {
text = opts.okLabel
}
case 7: // IDNO
text = opts.extraButton
}
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if text != nil {
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setWindowText.Call(wnd, strptr(*text))
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}
}
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return 1
}), 0)
})
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}