OnNewLayerEx picture event

Declaration
Global handler: 
 ENTRY OnNewLayerEx(IN INT _refId,_newLayer, INT _x1,_y1,_x2,_y2, IN INT _x3,_y3, BOOL _enable)
 ; actions
 END OnNewLayerEx

Parameters
_refId Input parameter of Int type. refID of object over which the mouse cursor is placed, or 0.
_newLayer Input parameter of Int type. Number of new layer.
_x1,_y1,_x2,_y2 Input-output parameter of Int type. Visible resultant area after changing the layer.
_x3,_y3 Input parameter - position of mouse cursor in a picture.
_enable Output parameter of BOOL type. Permission to change a layer.

Description
Picture event is generated before changing the layer in a picture. Unlike the picture event OnNewLayer, which only informs about the change of layer, OnNewLayerEx enables to control actively the way of changing the visible layer.
Event handler can enable or disable changing the layer by the parameter _enable. If changing the layer is disabled, the picture will change zoom but the layer will not be switched. The output parameters will not be used.
If changing the layer if enabled, the picture will change an active layer and set the visible area according to output parameters [x1, y1] [x2, y2]. In the simplest situation, the event handler enables only switching the layers but not changing the values that define the visible area after switching.
Example
 ENTRY OnNewLayerEx(IN INT _refId, _layers, INT _x1,_y1,_x2,_y2, IN INT _x3,_y3, BOOL _enable)
  IF _layers=2 THEN
   _x1 := 100
   _y1 := 100
   _x2 := 500
   _y2 := 500
  ENDIF
  _enable := @TRUE
 
 END OnNewLayerEx

Related pages:

ENTRY - picture event handler
Active picture events

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