C++ (Cpp) Application::FindSelection示例

BOOL NativePrefsDlg::InitDialog ()
{
	ERROR2IF ( mpParams == NULL, FALSE,
			   "NativePrefsDlg::InitDialog called after duff initialisation?!" );

	//First, do we have a selection?
	Application *pApp = GetApplication();

	ERROR2IF(pApp == NULL, FALSE,"NativePrefsDlg::InitDialog -  no application!");
	
	SelRange *pRange = pApp->FindSelection();
	
	ERROR2IF(pRange == NULL, FALSE,"NativePrefsDlg::InitDialog - no selection range!");
	DocRect ClipRect = pRange->GetBoundingRect();

	BOOL fThereIsASelection=!ClipRect.IsEmpty();

	//Now, is there a selection?
	if (fThereIsASelection)
	{
		// Yes. So ungrey both the buttons for selecting the nodes to export.
		EnableGadget(_R(IDC_NATIVEOPTS_SELECT), TRUE);
		EnableGadget(_R(IDC_NATIVEOPTS_DRAWING), TRUE);

		//Now, which of those buttons should be selected?
		switch ( mpParams->GetExportSel () )
		{
		case SELECTION:
			// Choose the export pair of buttons.
			SetLongGadgetValue(_R(IDC_NATIVEOPTS_SELECT), FALSE);
			SetLongGadgetValue(_R(IDC_NATIVEOPTS_DRAWING), TRUE);
			break;

		default:
		case DRAWING:
			// Choose the export pair of buttons.
			SetLongGadgetValue(_R(IDC_NATIVEOPTS_SELECT), TRUE);
			SetLongGadgetValue(_R(IDC_NATIVEOPTS_DRAWING), FALSE);
			break;
		}
	}
	else
	{
		//No. So grey the SELECTION button and ungrey
		//the DRAWING button
		EnableGadget(_R(IDC_NATIVEOPTS_SELECT), FALSE);
		EnableGadget(_R(IDC_NATIVEOPTS_DRAWING), TRUE);

		// And we must select the DRAWING button for the export area controls.
		SetLongGadgetValue(_R(IDC_NATIVEOPTS_SELECT), TRUE);
		SetLongGadgetValue(_R(IDC_NATIVEOPTS_DRAWING), FALSE);
	}

	return TRUE;
}