ArcGIS Engine Developer Guide

BUILDING APPLICATIONS WITH C++ AND CONTROL WIDGETS
HRESULT AddDateTool::get_Cursor(OLE_HANDLE* cursorName)
{
if (cursorName == NULL)
return E_POINTER;
if (m_hCursor != 0)
{
*cursorName = m_hCursor;
return S_OK;
}
return E_FAIL;
}
// Add the date to the page layout where the mouse is
HRESULT AddDateTool::OnMouseDown(LONG Button, LONG Shift, LONG X, LONG Y)
{
if (Button == 1)
{
// Format the date & create a text element
char* dateDisplay = FormatDate();
ITextElementPtr ipDateTextElem(CLSID_TextElement);
ipDateTextElem->put_Text(CComBSTR(dateDisplay));
delete[] dateDisplay;
ITextSymbolPtr ipDateTextSymb(CLSID_TextSymbol);
// Add it to the text element
ipDateTextElem->put_Symbol(ipDateTextSymb);
// Get point in map display coordinates
IActiveViewPtr ipActiveView;
m_ipHookHelper->get_ActiveView(&ipActiveView);
IScreenDisplayPtr ipScreenDisplay;
ipActiveView->get_ScreenDisplay(&ipScreenDisplay);
IDisplayTransformationPtr ipDisplayTrans;
ipScreenDisplay->get_DisplayTransformation(&ipDisplayTrans);
IPointPtr ipPoint;
ipDisplayTrans->ToMapPoint(X, Y, &ipPoint);
// Set the element's geometry
((IElementPtr) ipDateTextElem)->put_Geometry(ipPoint);
// Add element to the page layout's graphics container
IGraphicsContainerPtr ipGraphicsContainer;
ipActiveView->get_GraphicsContainer(&ipGraphicsContainer);
ipGraphicsContainer->AddElement((IElementPtr) ipDateTextElem, 0);
ipActiveView->PartialRefresh(esriViewGraphics, NULL, NULL);
}
return S_OK;
398 • ArcGIS Engine Developer Guide