113 lines
2.5 KiB
Go
113 lines
2.5 KiB
Go
package zenity
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import (
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"context"
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"runtime"
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"syscall"
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"unsafe"
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)
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var (
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messageBox = user32.NewProc("MessageBoxW")
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)
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func message(kind messageKind, text string, options []Option) (bool, error) {
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opts := applyOptions(options)
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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 || opts.extraButton != nil:
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flags |= 0x1 // MB_OKCANCEL
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}
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switch opts.icon {
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case ErrorIcon:
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flags |= 0x10 // MB_ICONERROR
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case QuestionIcon:
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flags |= 0x20 // MB_ICONQUESTION
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case WarningIcon:
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flags |= 0x30 // MB_ICONWARNING
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case InfoIcon:
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flags |= 0x40 // MB_ICONINFORMATION
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}
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if kind == questionKind && opts.defaultCancel {
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if opts.extraButton == nil {
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flags |= 0x100 // MB_DEFBUTTON2
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} else {
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flags |= 0x200 // MB_DEFBUTTON3
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}
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}
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if opts.ctx != nil || opts.okLabel != nil || opts.cancelLabel != nil || opts.extraButton != nil {
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runtime.LockOSThread()
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defer runtime.UnlockOSThread()
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unhook, err := hookMessageLabels(kind, opts)
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if err != nil {
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return false, err
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}
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defer unhook()
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}
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var title *uint16
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if opts.title != nil {
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title = syscall.StringToUTF16Ptr(*opts.title)
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}
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activate()
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s, _, err := messageBox.Call(0,
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uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(text))),
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uintptr(unsafe.Pointer(title)), flags)
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if opts.ctx != nil && opts.ctx.Err() != nil {
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return false, opts.ctx.Err()
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}
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if s == 0 {
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return false, err
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}
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if s == 7 || s == 2 && kind != questionKind { // IDNO
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return false, ErrExtraButton
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}
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if s == 1 || s == 6 { // IDOK, IDYES
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return true, nil
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}
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return false, nil
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}
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func hookMessageLabels(kind messageKind, opts options) (unhook context.CancelFunc, err error) {
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return hookDialog(opts.ctx, func(wnd uintptr) {
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enumChildWindows.Call(wnd,
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syscall.NewCallback(func(wnd, lparam uintptr) uintptr {
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name := [8]uint16{}
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getClassName.Call(wnd, uintptr(unsafe.Pointer(&name)), uintptr(len(name)))
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if syscall.UTF16ToString(name[:]) == "Button" {
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ctl, _, _ := getDlgCtrlID.Call(wnd)
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var text *string
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switch ctl {
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case 1, 6: // IDOK, IDYES
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text = opts.okLabel
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case 2: // IDCANCEL
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if kind == questionKind {
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text = opts.cancelLabel
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} else if opts.extraButton != nil {
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text = opts.extraButton
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} else {
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text = opts.okLabel
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}
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case 7: // IDNO
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text = opts.extraButton
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}
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if text != nil {
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ptr := syscall.StringToUTF16Ptr(*text)
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setWindowText.Call(wnd, uintptr(unsafe.Pointer(ptr)))
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}
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}
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return 1
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}), 0)
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})
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}
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