Updating the cursor when the mouse is over the draggable item. To better reflect to the user that a drag is in progress the cursor is set to the closed hand cursor. Each puzzle clue describes a term defined on the completed vocabulary sheet. Your application should never call dealloc explicitly. The view also supports moving the item by pressing the arrow keys and setting the color of the item. Use this fun crossword to see how well your students remember the terms associated with chocolate. Mouse-moved events allow the view to track the location of the cursor whenever it is located above the view. The DraggableItemView class displays a simple item and allows the user to drag it within the view. By default, window updates occur only in response to user actions. This allows the item's properties to be reset to their default values, shown later. When the background color is set, the entire view is marked as needing display. All you have to do is draw your content. Images can be loaded from existing files or created on the fly. When the view is not contained within a scroll view, it does nothing. In this case, when the nib file is loaded by the application, the view instance has already been created and the MyScrollView implementation of initWithFrame: is never called. Because all coordinates are multiplied through a transform at some point during rendering, the addition of these effects has little effect on performance. The awakeFromNib method provides an opportunity to provide initialization of a view when it is created as a result of a nib file being loaded. Implement a drawRect: method in your custom view. The NSView class's default implementation for the mouse handling events are inherited from NSResponder and pass the event up the responder chain for handling, bypassing the view in question entirely. Tuesday – Draw your shoes. During drawing, Cocoa applies the effects to the content you draw, imparting those characteristics on your shapes and images. Custom view subclasses can interpret mouse events in any way that is appropriate. In the DraggableItemView implementation the code is factored into its own method because it will be reused later. Even Revolutionary War soldiers were sometimes paid in chocolate! 331 . Christopher Columbus brought cacao beans back to Spain after his trip to the Americas in 1502. It marks the draggable item's area as needing display before and after altering the item's location by the requested amount. Listing 4-13 DraggableItemView implementation of resetCursorRects. Review chocolate terminology with this word search puzzle. In Cocoa, the NSColor and NSColorSpace classes provide the implementation for color objects and color space objects.
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