4D v13

PV GET PREVIOUS ACTIVE CELL

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4D View v13
PV GET PREVIOUS ACTIVE CELL

PV GET PREVIOUS ACTIVE CELL 


 

PV GET PREVIOUS ACTIVE CELL ( area ; column ; row ) 
Parameter Type   Description
area  Longint in 4D View area
column  Longint in Cell column number
row  Longint in Cell row number

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:

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

 
PROPERTIES 

Product: 4D
Theme: PV Current cell
Number: 15929

 
INDEX

Alphabetical list of commands

 
HISTORY 

Created: 4D View 6.8

 
SEE ALSO 

PV GOTO CELL
PV ON ERROR