141 lines
3.1 KiB
Go
141 lines
3.1 KiB
Go
package zenity
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import (
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"bytes"
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"context"
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"os"
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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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getDlgCtrlID = user32.NewProc("GetDlgCtrlID")
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loadImage = user32.NewProc("LoadImageW")
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destroyIcon = user32.NewProc("DestroyIcon")
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createIconFromResource = user32.NewProc("CreateIconFromResource")
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)
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func message(kind messageKind, text string, opts options) 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 |= _MB_YESNOCANCEL
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case kind == questionKind:
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flags |= _MB_OKCANCEL
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case opts.extraButton != nil:
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flags |= _MB_YESNO
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}
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switch opts.icon {
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case ErrorIcon:
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flags |= _MB_ICONERROR
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case QuestionIcon:
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flags |= _MB_ICONQUESTION
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case WarningIcon:
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flags |= _MB_ICONWARNING
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case InfoIcon:
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flags |= _MB_ICONINFORMATION
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case nil:
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switch kind {
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case errorKind:
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flags |= _MB_ICONERROR
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case questionKind:
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flags |= _MB_ICONQUESTION
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case warningKind:
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flags |= _MB_ICONWARNING
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case infoKind:
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flags |= _MB_ICONINFORMATION
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}
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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 |= _MB_DEFBUTTON2
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} else {
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flags |= _MB_DEFBUTTON3
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}
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}
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defer setup()()
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if opts.ctx != nil || opts.okLabel != nil || opts.cancelLabel != nil || opts.extraButton != nil || opts.icon != nil {
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unhook, err := hookMessageDialog(kind, opts)
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if err != nil {
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return 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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s, _, err := messageBox.Call(0, strptr(text), uintptr(unsafe.Pointer(title)), flags)
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if opts.ctx != nil && opts.ctx.Err() != nil {
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return opts.ctx.Err()
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}
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switch s {
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case _IDOK, _IDYES:
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return nil
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case _IDCANCEL:
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return ErrCanceled
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case _IDNO:
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return ErrExtraButton
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default:
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return err
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}
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}
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func hookMessageDialog(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(hookMessageDialogCallback),
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uintptr(unsafe.Pointer(&opts)))
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})
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}
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func hookMessageDialogCallback(wnd uintptr, lparam *options) uintptr {
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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 _IDOK, _IDYES:
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text = lparam.okLabel
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case _IDCANCEL:
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text = lparam.cancelLabel
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case _IDNO:
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text = lparam.extraButton
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}
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if text != nil {
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setWindowText.Call(wnd, strptr(*text))
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}
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if i, ok := lparam.icon.(string); ok && ctl == 20 /*IDC_STATIC_OK*/ {
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var icon uintptr
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data, _ := os.ReadFile(i)
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switch {
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case bytes.HasPrefix(data, []byte("\x00\x00\x01\x00")):
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icon, _, _ = loadImage.Call(0,
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strptr(i),
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1, /*IMAGE_ICON*/
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0, 0,
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0x00008050 /*LR_LOADFROMFILE|LR_DEFAULTSIZE|LR_SHARED*/)
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case bytes.HasPrefix(data, []byte("\x89PNG\r\n\x1a\n")):
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icon, _, _ = createIconFromResource.Call(
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uintptr(unsafe.Pointer(&data[0])),
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uintptr(len(data)),
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1, 0x00030000)
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defer destroyIcon.Call(icon)
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}
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if icon != 0 {
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sendMessage.Call(wnd, 0x0170 /*STM_SETICON*/, icon, 0)
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}
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}
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return 1
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}
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