4D v13
PV Area, Introduction
- 4D View Language
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- PV Area
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- PV Area, Introduction
- PV Area to blob
- PV BLOB TO AREA
- PV DELETE OFFSCREEN AREA
- PV EXECUTE COMMAND
- PV Get area property
- PV GET COMMAND STATUS
- PV GET LAST ERROR
- PV Get on command method
- PV Get on error method
- PV Get on event method
- PV New offscreen area
- PV ON COMMAND
- PV ON ERROR
- PV ON EVENT
- PV REDRAW
- PV SCROLL AREA
- PV SET AREA PROPERTY
- PV SET COMMAND STATUS
PV Area, Introduction
The routines of this theme allow managing off-screen areas and external areas displayed in forms. The allow you to create or erase an off-screen area, to paste the content of a field or a BLOB variable in an external area or off-screen, or to save a 4D View area in a field or a BLOB variable.
Additionally, this theme gathers commands allowing the programmer to intercept different types of events detected by a 4D View area, to build their own error manager and also manage 4D View commands accessible using menus or palettes.
In this theme, several commands make reference to the "callback" concept: this mechanism is used here to link a method to an event, error or 4D View command. Every time 4D View detects an event, error or the activation of a menu command, the 4D project method defined by the area settings is executed: in this context, this method is called a "callback method".
The PV Area theme commands that make reference to callback methods are:
Product: 4D
Theme: PV Area
