ArcGIS Engine Developer Guide

BUILDING APPLICATIONS WITH C++ AND CONTROL WIDGETS
set the envelope to the new visible bounds of the map. By refreshing the
MapControl you force it to redraw the shape on its display.
#include "TransformEvents.h"
HRESULT TransformEvents::BoundsUpdated(IDisplayTransformation* sender)
{
return E_NOTIMPL;
}
HRESULT TransformEvents::DeviceFrameUpdated(IDisplayTransformation* sender,
VARIANT_BOOL sizeChanged)
{
return E_NOTIMPL;
}
HRESULT TransformEvents::ResolutionUpdated(IDisplayTransformation* sender)
{
return E_NOTIMPL;
}
HRESULT TransformEvents::RotationUpdated(IDisplayTransformation* sender)
{
return E_NOTIMPL;
}
HRESULT TransformEvents::UnitsUpdated(IDisplayTransformation* sender)
{
return E_NOTIMPL;
}
HRESULT TransformEvents::VisibleBoundsUpdated(IDisplayTransformation* sender,
VARIANT_BOOL sizeChanged)
{
// Set the extent to the new visible extent
sender->get_VisibleBounds(&g_ipCurrentExtent);
// Refresh the MapControl's foreground phase
HRESULT hr = g_ipMapControl->Refresh(esriViewForeground);
return hr;
}
8. Although the TransformEvents class has been implemented, those events are not
yet listened for.
a. First, include the new TransformEvents.h header file in MapViewer.h:
#include "TOCControlEvents.h"
#include "TransformEvents.h"
b. Next start up these events in MapViewer.cpp’s main, but you will not advise
them there. Remember to place the variable declarations at the top of
MapViewer.cpp.
TOCControlEvents* g_tocEvents;
386 • ArcGIS Engine Developer Guide