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version 1
CT EVENT FILTER (area; filter)
| Parameter | Type | Description | |
| area | Longint |  | 4D Chart area |
| filter | Longint | | Events to process |
Description
The CT EVENT FILTER command specifies which events cause the object method of area or the event method to be executed.
By default, an object method attached to a 4D Chart area is executed when the user selects an object outside of the area. With CT EVENT FILTER you can specify other events that execute the method. In addition, a method installed with the CT ON EVENT command will also be executed.
filter specifies the events to use, expressed as the sum of event codes. The following are the event codes:
| Value | Event |
| -1 | All events |
| 0 | No events |
| 1 | Area creation |
| 2 | Area deletion |
| 4 | Area activated (clicked or brought to the front) |
| 8 | Area deactivated (area is no longer active) |
| 16 | Object creation (create, paste, duplicate) |
| 32 | Object deletion (delete, cut, clear) |
| 64 | Ctrl+Click (Windows) or Command-click (Macintosh), |
| not necessarily on object | |
| 128 | Object was moved (nudge, alignment, move, etc.) |
| 256 | Object was resized (arrow keys, drag, etc.) |
| 1024 | Change in selected object(s) |
| 2048 | Double-click |
| 4096 | Object was reshaped |
If you specify -1 for area, the event filter becomes the default filter for all newly created 4D Chart areas on forms and in plug-in windows. This allows you to trap for areas created from the Plug-ins menu of the User environment. It also allows for consistent event handling in all areas.
Example
This example adds Ctrl+click and double-click to the list of default events trapped by the chart area's object method.
CT EVENT FILTER (Area;64+2048)
See Also
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