In this topic
Available methods
When redrawing the display, any of the following methods can be called by the client:
Typically, however, you won't call Invalidate directly. If you're using a view in your application - for example, Map or PageLayout - the view itself can be used to refresh the screen. The view manages the display's caches and identifies the best way to carry out invalidation.
PartialRefresh
The PartialRefresh method of IActiveView lets you specify the part of the view to redraw and allows the view to work with display caches in a way that makes drawing quick and efficient. PartialRefresh uses the information it has of the cache layout to invalidate as little as possible. Ensure PartialRefresh is called using the most specific arguments possible to optimize drawing. The PartialRefresh method is the recommended method for redrawing and should be used whenever possible.
The following table shows the arguments for PartialRefresh and their effect on the view (Map or PageLayout) in which they are called:
|
Draw phase |
Map |
PageLayout |
|
esriViewBackground |
Unused |
Page/snap grid |
|
esriViewGeography |
Layers |
Unused |
|
esriViewGeoSelection |
Feature selection |
Unused |
|
esriViewGraphics |
Labels/graphics |
Graphics |
|
esriViewGraphicSelection |
Graphic selection |
Element selection |
|
esriViewForeground |
Unused |
Map guides |
Refresh
The Refresh method of IActiveView draws everything, which is very inefficient. Only call Refresh when absolutely necessary, since this is usually a time-consuming operation. Use PartialRefresh instead if possible.
Invalidate
The Invalidate method of IScreenDisplay allows the refresh of specific regions on display. This approach is not recommended for clients because it requires manual control of drawing caches and invalidation and may not be optimized by the client for drawing. Use PartialRefresh instead if possible.
Redrawing the display
To redraw specific draw phases with calls to the PartialRefresh method, perform the following steps:
Note the use of optional arguments.
- Refresh a single layer as shown in the following code:
pMap.PartialRefresh(esriViewGeography, pLayer, Nothing)
pMap.PartialRefresh(esriViewGeography, pLayer, null);
- Refresh all layers as shown in the following code:
pMap.PartialRefresh(esriViewGeography, Nothing, Nothing)
pMap.PartialRefresh(esriViewGeography, null, null);
- Refresh the feature selection as shown in the following code:
When selecting features, you must call PartialRefresh twice, once before and once after the feature selection operation.
pMap.PartialRefresh(esriViewGeoSelection, Nothing, Nothing)
pMap.PartialRefresh(esriViewGeoSelection, null, null);
- Refresh the labels as shown in the following code:
pMap.PartialRefresh(esriViewGraphics, Nothing, Nothing)
pMap.PartialRefresh(esriViewGraphics, null, null);
- Refresh a single graphic element as shown in the following code:
pLayout.PartialRefresh(esriViewGraphics, pElement, Nothing)
pLayout.PartialRefresh(esriViewGraphics, pElement, null);
- Refresh all graphic elements as shown in the following code:
pLayout.PartialRefresh(esriViewGraphics, Nothing, Nothing)
pLayout.PartialRefresh(esriViewGraphics, null, null);
- Refresh the graphic selection as shown in the following code:
pLayout.PartialRefresh(esriViewGraphicSelection, Nothing, Nothing)
pLayout.PartialRefresh(esriViewGraphicSelection, null, null);
Invalidating any phase causes the recording cache to be invalidated also. To force a redraw from the recording cache, use the call in the following code example:
[VB.NET] pScreenDisplay.Invalidate(Nothing, False, esriNoScreenCache)
pScreenDisplay.Invalidate(null, FALSE, esriNoScreenCache);
See Also:
How to add display cachingDisplay Library Overview
| Development licensing | Deployment licensing |
|---|---|
| ArcGIS for Desktop Basic | ArcGIS for Desktop Basic |
| ArcGIS for Desktop Standard | ArcGIS for Desktop Standard |
| ArcGIS for Desktop Advanced | ArcGIS for Desktop Advanced |
| Engine Developer Kit | Engine |