ArcGIS Engine Developer Guide

BUILDING APPLICATIONS WITH C++ AND CONTROL WIDGETS
VARIANT_BOOL sizeChanged, VARIANT newEnvelope);
void OnFullExtentUpdated(VARIANT displayTransformation,
VARIANT newEnvelope);
void OnKeyDown(long keyCode, long shift);
void OnKeyUp(long keyCode, long shift);
void OnMapReplaced(VARIANT newMap);
void OnMouseDown(long button, long shift, long x, long y,
double mapX, double mapY);
void OnMouseMove(long button, long shift, long x, long y,
double mapX, double mapY);
void OnMouseUp(long button, long shift, long x, long y,
double mapX, double mapY);
void OnOleDrop(esriControlsDropAction dropAction, VARIANT
dataObjectHelper, long* effect, long button, long
shift, long x, long y);
void OnSelectionChanged();
void OnViewRefreshed(VARIANT ActiveView, long viewDrawPhase,
VARIANT layerOrElement, VARIANT envelope);
};
#endif // __MAPCONTROLEVENTS_H_
13. Implement those events in MapControlEvents.cpp. Leave all of the functions
blank except OnAfterDraw, in which the rectangle will be drawn on the
MapControl.
#include "MapControlEvents.h"
void MapControlEvents::OnAfterDraw(VARIANT display, long viewDrawPhase)
{
if (g_ipCurrentExtent == 0)
return;
// If the foreground phase has drawn, viewDrawPhase will be 32
esriViewDrawPhase drawPhase = esriViewDrawPhase(viewDrawPhase);
if (drawPhase == esriViewForeground)
{
// Draw the shape on the MapControl
CComVariant varSymbol = CComVariant(g_ipFillSymbol);
g_ipMapControl->DrawShape((IGeometryPtr) g_ipCurrentExtent,
&varSymbol);
}
}
void MapControlEvents::OnAfterScreenDraw(long hdc)
{
}
void MapControlEvents::OnBeforeScreenDraw(long hdc)
{
}
Chapter 6 • Developer scenarios • 389