Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 124)

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CHAPTER 3

Views

3-40 Using Views

Animating Views 3

There are four view methods that perform special animation effects on views. They

are summarized here:

■ Effect—performs any animation that can be specified in the viewEffect slot.

■ SlideEffect—slides a whole view or its contents up or down.

■ RevealEffect—slides part of a view up or down.

■ Delete—crumples a view and tosses it into a trash can.

Note that these animation methods only move bits around on the screen. They do

not change the actual bounds of a view, or do anything to a view that would change

its contents. When you use any of these methods, you are responsible for supplying

another method that actually changes the view bounds or contents. Your method is

called just before the animation occurs.

Dragging a View 3

Dragging a view means allowing the user to move the view by tapping on it,

holding the pen down, and dragging it to a new location on the screen. To drag a

view, send the view a

Drag message.

Dragging and Dropping with Views 3

Dragging and dropping a view means allowing a user to drag an item and drop it

into another view.

To enable dragging and dropping capability, you must ﬁrst create a frame that

contains slots that specify how the drop will behave. For example, you specify the

types of objects that can be dropped into a view, if any. Examples include

'text

'picture. See the dragInfo parameter to the DragAndDrop method

(page 2-46) in the Newton Programmer’s Reference for a complete description

of the slots.

You must set up code to handle a drag and drop in one of two ways: either add

code to create a frame and code to call

DragAndDrop’s view method in each

source and destination view that accepts a drag and drop message, or you can

create a proto and use it as a template for each view.

Each view must also have the following methods. The system calls these methods

in the order listed.

■ ViewGetDropTypesScript— is sent to the destination view. It is called

repeatedly while the pen is down.

ViewGetDropTypesScript is passed the

current location as the dragged item is moved from its source location to its

destination location. An array of object types is also returned. In this method,

you must return an array of object types that can be accepted by that location.

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Apple Newton Utilities Guide de l'utilisateur Page 124

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