Views

Using Views

GetDropDataScript

-- is sent to the source view when the destination view

is found.

ViewDropScript

-- is sent to the destination view. You must add the object to

the destination view.

ViewDropMoveScript

-- is sent to the source view. It is used when dragging

an object within the same view.

ViewDropRemoveScript

and

ViewDropScript

are not called in this case.

ViewDropRemoveScript

-- is sent to the source view. It is used when

dragging an object from one view to another. You must delete the original from
the source view when the drag completes.

Additional optional methods can also be added. If you do not include these, the
default behavior occurs.

ViewDrawDragDataScript

-- is sent to the source view. It draws the image

that will be dragged. If you don't specify an image, the area inside the rectangle
specified by the

DragAndDrop

bounds parameter is used.

ViewDrawDragBackgroundScript

-- is sent to the source view. It draws

the image that will appear behind the dragged image.

ViewFindTargetScript

-- is sent to the destination view. It lets the

destination view change the drop point to a different view.

ViewDragFeedbackScript

-- is sent to the destination view. It provides

visual feedback while items are dragged.

ViewDropDoneScript

-- is sent to the destination view to tell it that the

object has been dropped.

Scrolling View Contents

3

There are different methods of scrolling a view, supported by view methods you
call to do the work. Both methods described here operate on the child views of the
view to which you send a scroll message.

One method is used to scroll all the children of a view any incremental amount in
any direction, within the parent view. Use the

SetOrigin

method to perform this

kind of scrolling. This method changes the view origin by setting the values of the

viewOriginX

and

viewOriginY

slots in the view.

Another kind of scrolling is used for a situation in which there is a parent view
containing a number of child views positioned vertically, one below the other. The

SyncScroll

method provides the ability to scroll the child views up or down the

height of one of the views. This is the kind of scrolling you see on the built-in
Notepad application.