package zenity import ( "syscall" "time" "unsafe" ) func calendar(text string, opts options) (time.Time, error) { if opts.title == nil { opts.title = stringPtr("") } if opts.okLabel == nil { opts.okLabel = stringPtr("OK") } if opts.cancelLabel == nil { opts.cancelLabel = stringPtr("Cancel") } dlg := &calendarDialog{} return dlg.setup(text, opts) } type calendarDialog struct { out time.Time err error wnd uintptr textCtl uintptr dateCtl uintptr okBtn uintptr cancelBtn uintptr extraBtn uintptr font font } func (dlg *calendarDialog) setup(text string, opts options) (time.Time, error) { defer setup()() dlg.font = getFont() defer dlg.font.delete() icon := getIcon(opts.windowIcon) defer icon.delete() if opts.ctx != nil && opts.ctx.Err() != nil { return time.Time{}, opts.ctx.Err() } instance, _, err := getModuleHandle.Call(0) if instance == 0 { return time.Time{}, err } cls, err := registerClass(instance, icon.handle, syscall.NewCallback(calendarProc)) if cls == 0 { return time.Time{}, err } defer unregisterClass.Call(cls, instance) owner, _ := opts.attach.(uintptr) dlg.wnd, _, _ = createWindowEx.Call(_WS_EX_CONTROLPARENT|_WS_EX_WINDOWEDGE|_WS_EX_DLGMODALFRAME, cls, strptr(*opts.title), _WS_POPUPWINDOW|_WS_CLIPSIBLINGS|_WS_DLGFRAME, _CW_USEDEFAULT, _CW_USEDEFAULT, 281, 281, owner, 0, instance, uintptr(unsafe.Pointer(dlg))) dlg.textCtl, _, _ = createWindowEx.Call(0, strptr("STATIC"), strptr(text), _WS_CHILD|_WS_VISIBLE|_WS_GROUP|_SS_WORDELLIPSIS|_SS_EDITCONTROL|_SS_NOPREFIX, 12, 10, 241, 16, dlg.wnd, 0, instance, 0) var flags uintptr = _WS_CHILD | _WS_VISIBLE | _WS_GROUP | _WS_TABSTOP | _MCS_NOTODAY dlg.dateCtl, _, _ = createWindowEx.Call(0, strptr(_MONTHCAL_CLASS), 0, flags, 12, 30, 241, 164, dlg.wnd, 0, instance, 0) dlg.okBtn, _, _ = createWindowEx.Call(0, strptr("BUTTON"), strptr(*opts.okLabel), _WS_CHILD|_WS_VISIBLE|_WS_GROUP|_WS_TABSTOP|_BS_DEFPUSHBUTTON, 12, 206, 75, 24, dlg.wnd, _IDOK, instance, 0) dlg.cancelBtn, _, _ = createWindowEx.Call(0, strptr("BUTTON"), strptr(*opts.cancelLabel), _WS_CHILD|_WS_VISIBLE|_WS_GROUP|_WS_TABSTOP, 12, 206, 75, 24, dlg.wnd, _IDCANCEL, instance, 0) if opts.extraButton != nil { dlg.extraBtn, _, _ = createWindowEx.Call(0, strptr("BUTTON"), strptr(*opts.extraButton), _WS_CHILD|_WS_VISIBLE|_WS_GROUP|_WS_TABSTOP, 12, 206, 75, 24, dlg.wnd, _IDNO, instance, 0) } if opts.time != nil { var date _SYSTEMTIME year, month, day := opts.time.Date() date.year = uint16(year) date.month = uint16(month) date.day = uint16(day) sendMessage.Call(dlg.dateCtl, _MCM_SETCURSEL, 0, uintptr(unsafe.Pointer(&date))) } dlg.layout(getDPI(dlg.wnd)) centerWindow(dlg.wnd) setFocus.Call(dlg.dateCtl) showWindow.Call(dlg.wnd, _SW_NORMAL, 0) if opts.ctx != nil { wait := make(chan struct{}) defer close(wait) go func() { select { case <-opts.ctx.Done(): sendMessage.Call(dlg.wnd, _WM_SYSCOMMAND, _SC_CLOSE, 0) case <-wait: } }() } if err := messageLoop(dlg.wnd); err != nil { return time.Time{}, err } if opts.ctx != nil && opts.ctx.Err() != nil { return time.Time{}, opts.ctx.Err() } return dlg.out, dlg.err } func (dlg *calendarDialog) layout(dpi dpi) { font := dlg.font.forDPI(dpi) sendMessage.Call(dlg.textCtl, _WM_SETFONT, font, 1) sendMessage.Call(dlg.dateCtl, _WM_SETFONT, font, 1) sendMessage.Call(dlg.okBtn, _WM_SETFONT, font, 1) sendMessage.Call(dlg.cancelBtn, _WM_SETFONT, font, 1) sendMessage.Call(dlg.extraBtn, _WM_SETFONT, font, 1) setWindowPos.Call(dlg.wnd, 0, 0, 0, dpi.scale(281), dpi.scale(281), _SWP_NOZORDER|_SWP_NOMOVE) setWindowPos.Call(dlg.textCtl, 0, dpi.scale(12), dpi.scale(10), dpi.scale(241), dpi.scale(16), _SWP_NOZORDER) setWindowPos.Call(dlg.dateCtl, 0, dpi.scale(12), dpi.scale(30), dpi.scale(241), dpi.scale(164), _SWP_NOZORDER) if dlg.extraBtn == 0 { setWindowPos.Call(dlg.okBtn, 0, dpi.scale(95), dpi.scale(206), dpi.scale(75), dpi.scale(24), _SWP_NOZORDER) setWindowPos.Call(dlg.cancelBtn, 0, dpi.scale(178), dpi.scale(206), dpi.scale(75), dpi.scale(24), _SWP_NOZORDER) } else { setWindowPos.Call(dlg.okBtn, 0, dpi.scale(12), dpi.scale(206), dpi.scale(75), dpi.scale(24), _SWP_NOZORDER) setWindowPos.Call(dlg.extraBtn, 0, dpi.scale(95), dpi.scale(206), dpi.scale(75), dpi.scale(24), _SWP_NOZORDER) setWindowPos.Call(dlg.cancelBtn, 0, dpi.scale(178), dpi.scale(206), dpi.scale(75), dpi.scale(24), _SWP_NOZORDER) } } func calendarProc(wnd uintptr, msg uint32, wparam uintptr, lparam *unsafe.Pointer) uintptr { var dlg *calendarDialog switch msg { case _WM_NCCREATE: saveBackRef(wnd, *lparam) dlg = (*calendarDialog)(*lparam) case _WM_NCDESTROY: deleteBackRef(wnd) default: dlg = (*calendarDialog)(loadBackRef(wnd)) } switch msg { case _WM_DESTROY: postQuitMessage.Call(0) case _WM_CLOSE: dlg.err = ErrCanceled destroyWindow.Call(wnd) case _WM_COMMAND: switch wparam { default: return 1 case _IDOK, _IDYES: var date _SYSTEMTIME sendMessage.Call(dlg.dateCtl, _MCM_GETCURSEL, 0, uintptr(unsafe.Pointer(&date))) dlg.out = time.Date(int(date.year), time.Month(date.month), int(date.day), 0, 0, 0, 0, time.UTC) case _IDCANCEL: dlg.err = ErrCanceled case _IDNO: dlg.err = ErrExtraButton } destroyWindow.Call(wnd) case _WM_DPICHANGED: dlg.layout(dpi(uint32(wparam) >> 16)) default: res, _, _ := defWindowProc.Call(wnd, uintptr(msg), wparam, uintptr(unsafe.Pointer(lparam))) return res } return 0 }