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
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