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4D View v14

PV GET PREVIOUS ACTIVE CELL


PV GET PREVIOUS ACTIVE CELL ( area ; column ; row )

Parameter	Type	Description
area	Longint	4D View area
column	Longint	Cell column number
row	Longint	Cell row number

Description

The PV GET PREVIOUS ACTIVE CELL command returns the coordinates for the preceding active (current) cell for the indicated area in the column and row parameters.

Note: There is no “stack” for current cells, only the preceding cell is known, unlike cells that were first current. It is up to you to manage the memorization of successive current cells if necessary, for example, to install various levels of cancellation.

Example

In the example below, we will create a "rebound" effect for a given cell. Put an event management method into place, which will be called every time the active cell changes:

PV ON EVENT(Area;pv on active cell changed;"EventMethod")

This project method EventMethod causes the user to "bounce" to cell C5. Once this cell has been reached, it is the last current cell that becomes active again, forbidding C5 from being selected by any means: 4D View command, key stroke, mouse, etc.

  `Method: EventMethod

  `With this method, we will "bounce" to cell C5

 

 C_LONGINT($1) `4D View area reference

 C_LONGINT($2) `Évent

 C_LONGINT($3) `Modification key code

 C_LONGINT($4) `Column number

 C_LONGINT($5) `Row number

 C_LONGINT($6) `Ascii code of the key

 C_LONGINT($Column;$Row) `Cell coordinates (current then previous)

 C_BOOLEAN($0) `Value to return

 

 $0:=False

 

 PV GET CURRENT CELL($1;$Column;$Row) `Get coordinates

 

 If($Column=3)&($Row=5) `Cell C5 is current

    PV GET PREVIOUS ACTIVE CELL($1;$Column;$Row) `Last cell

    PV GOTO CELL($1;$Column;$Row) `Becomes current again

 End if