ArcGIS Engine Developer Guide

BUILDING APPLICATIONS WITH VISUAL JAVABEANS
4. Call the createOverviewSymbol from the buildAndShow() method, after the call
setting label editing to manual:
// Set label editing to manual.
toc.setLabelEdit(esriTOCControlEdit.esriTOCControlManual);
// Create symbol used to draw overview on the MapBean.
createOverviewSymbol();
// Add popup menu items.
. . .
5. In the event listener for IPageLayoutControlEvents added in the
addEventListeners() method earlier, get a reference to the pageLayout
component’s focus map. Store the extent of the focusMap in the
currentExtent member variable. This extent will be used to draw the overview
rectangle on the map component. To achieve this, add the lines of code
below, after loading the map documents and setting its extent in the
onPageLayoutReplaced event handler:
pageLayout.addIPageLayoutControlEventsListener(
new IPageLayoutControlEventsAdapter() {
public void onPageLayoutReplaced(
IPageLayoutControlEventsOnPageLayoutReplacedEvent evt)
throws IOException{
map.loadMxFile(pageLayout.getDocumentFilename(), null, null);
map.setExtent(map.getFullExtent());
focusMap = new Map(pageLayout.getActiveView().getFocusMap());
currentExtent = focusMap.getExtent();
}
});
6. The default events of the PageLayoutBean are the
IPageLayoutControlEvents. These events do not tell you when the extent of
the map within the data frame changes. To do this you will trap the
ITransformEvents of the PageLayoutBean focus map. Add the following
event listeners to listen to the DisplayTransformation object’s
visibleBoundsUpdated event.
The visibleBoundsUpdated event is triggered whenever the extent of the map
is changed and is used to set the IEnvelope to the new visible bounds of the
map. By refreshing the MapBean you force it to redraw the shape on its display.
Modify the listener you edited in the last step, as shown below:
pageLayout.addIPageLayoutControlEventsListener(
new IPageLayoutControlEventsAdapter() {
public void onPageLayoutReplaced(
IPageLayoutControlEventsOnPageLayoutReplacedEvent evt)
throws IOException{
map.loadMxFile(pageLayout.getDocumentFilename(), null, null);
map.setExtent(map.getFullExtent());
focusMap = new Map(pageLayout.getActiveView().getFocusMap());
currentExtent = focusMap.getExtent();
318 • ArcGIS Engine Developer Guide