GEOS SDK TechDocs
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5.1 GenViewControl Instance Data
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5.3 GenViewControl Example
When a view's attributes change and the controller will be affected, the view sends notification to the controller. The type of notification handled by the controller is NT_VIEW_STATE_CHANGE. This notification type will carry with it a block containing a structure of type
NotifyViewStateChange
, shown in The NotifyViewStateChange Structure
.
The
NotifyViewStateChange
structure contains much more information about the view than just those features affected by the controller. Additional information includes background color, increment, document bounds, Ink information, origin, etc. If you want to add functionality to the GenViewControl, you can set up additional UI gadgetry with the
GenControlClass
attribute
ATTR_GEN_CONTROL_APP_UI
and have it change and handle the appropriate attributes.
Code Display 9-8 The NotifyViewStateChange Structure
/* This structure is passed to the GenViewControl object when a feature of the * active view changes. It is passed with notification NT_VIEW_STATE_CHANGE. */
typedef struct {
PointDWFixed NVSC_origin; /* absolute origin of the view */
RectDWord NVSC_docBounds; /* document bounds of the view */
PointDWord NVSC_increment; /* the view's increment value */
PointWWFixed NVSC_scaleFactor; /* view's current scale factor */
ColorQuad NVSC_color; /* view's background color */
GenViewAttrs NVSC_attrs; /* view's GVI_attrs record */
GenViewDimensionAttrs NVSC_horizAttrs; /* view's GVI_horizAttrs record */
GenViewDimensionAttrs NVSC_vertAttrs; /* view's GVI_vertAttrs record */
GenViewInkType NVSC_inkType; /* view's GVI_inkType value */
/* The following four fields are used internally by the GenViewControl. */
XYSize NVSC_contentSize;
XYSize NVSC_contentScreenSize;
PointDWord NVSC_originRelative;
PointDWord NVSC_documentSize;
} NotifyViewStateChange;
GEOS SDK TechDocs
|
| 5.1 GenViewControl Instance Data
| 5.3 GenViewControl Example