Rogue Wave Views Manager Package API Reference Guide |
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Manager layer visibility filter class. More...
#include <ilviews/manager/layer.h>
Public Member Functions | |
virtual IlBoolean | isVisible (const IlvManagerLayer *mgrlayer, const IlvMgrView *mgrview) const =0 |
Indicates if a visible layer must be displayed in a manager view. More... | |
Manager layer visibility filter class.
Library: ilvmgr
This abstract class provides a way to hide manager layers depending on conditions defined by the implementer of the IlvLayerVisibilityFilter
subclass. The visibility of a layer in a manager view is determined by the value returned by the pure virtual member function isVisible
. To be displayed, a layer must be visible for the manager view (see member functions isVisible()
of IlvManager
and IlvManagerLayer
classes) and for the visibility filters set on the manager layer.
Note that a visibility filter cannot force a hidden layer to be displayed, it can only hide a layer that would be visible otherwise.
A typical use of visibility filters is to hide specific layers depending of the zoom level in a given manager view; for example to remove detailed information in a cartographic application when a large map is fully displayed and only show it when zooming on a small portion of the map.
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pure virtual |
Indicates if a visible layer must be displayed in a manager view.
Must be implemented by subclasses. The returned value is used by by the manager to determine whether the specified layer can be displayed in the specified manager view. The method is only called if the layer is visible for the manager and for the manager view.
IlTrue
if the filter allows the layer to be visible in the manager view. mgrlayer | Specifies the manager layer. |
mgrview | Specifies the manager view. |
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