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CHAPTER 20 MODEL-VIEW-CONTROLLER PATTERN
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NSView defines a tag property useful for identifying individual subviews but the property is immutable and always returns 0 in the base class. NSControl and some other subclasses override tag so that it s a mutable property. If you want to create a custom subclass of NSView and assign it a tag, you must override the tag property, make it mutable, and provide a place to store the value. NSTextField is a multi-purpose class that is used to display most text in a window. It can be configured to display immutable text (a label), display and edit a single line of text (text field), or display and edit multiline text (text area). It implements a rich set of properties that determine how the text is displayed, aligned, scrolled, and wrapped.
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Tip When creating your own NSView subclass, use the Objective-C NSView subclass source file template in
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Now that you understand the basic organization of the view classes, you ll want to start populating views with subviews, and possibly even create your own custom view classes. To do that, you need to understand the Cocoa drawing environment and how a custom NSView objects works, which are described in the next few sections.
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Drawing geometry is a little different in Cocoa than it is in Swing. Cocoa s natural coordinate system is inverted from the one used in Java, but can optionally be flipped so that it s the same. Pen position and drawing bounds are also different. In Cocoa, all graphic values are floating-point numbers. This includes coordinates, sizes, widths, and color values. Values like red or transparency are typically expressed as a range between 0.0 and 1.0, inclusive. This keeps all of the drawing primitives independent of resolution, display devices, and media.
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Coordinates in Cocoa are abstract points in a continuous coordinate system. Think of the coordinate grid as infinitely thin lines on a plane. Most of the time, coordinates are mapped 1:1 to pixels that fill the space between the lines (refer to Figures 20-11 and 20-12, later in this section). Thinking in coordinates helps avoid enditus that anxiety induced by the difference between the drawing coordinates and the pixels that will actually be drawn. Cocoa drawing always occurs between the logical coordinates. A line from coordinate 0.0 to 10.0 will draw a line exactly 10 coordinate spaces long. Filling a 10 10 rectangle fills exactly 100 coordinate units worth of pixels. There are few exceptions to this. One notable exception is Bezier lines that can have non-square line end caps, which can cause it to draw beyond the end point of the line. All drawing is anti-aliased, so it s easy for drawing to partially affect pixels.
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CHAPTER 20 MODEL-VIEW-CONTROLLER PATTERN
Coordinate System
Cocoa s natural coordinate system is Cartesian, which places the X,Y origin in the lower left-hand corner of view, as shown in Figure 20-10.
Figure 20-10. Java and native Cocoa coordinate systems This is Cocoa s natural coordinate system, but it s not the only one available. NSView defines a readonly flipped property that s queried by the graphics system. If an NSView subclass returns YES when sent -isFlipped, Cocoa will flip the view s Y-axis, creating a coordinate system identical to Java s. The base NSView class, view classes that draw images, and views that are containers (tab view, split view, scroll view) all use natural, Cartesian, coordinates. View objects with content that flows from the top down (table, outline, list, browser, and text views) use flipped coordinate systems. When creating your own NSView subclass you re free to override isFlipped and choose the coordinate system that works most naturally with your content. The flipped property is assumed to be an immutable property of the view; changing it spontaneously could have unpredictable results.
Caution A flipped coordinate system changes the meaning of the frame rectangles for its subviews. When
working with frame rectangles, your code may have to consider if the coordinate system of the superview is flipped.
In addition to flipping the coordinate system, an NSView s frame or content can be arbitrarily rotated and repositioned. Rotating the frame by setting the frameRotation property rotates the view in its superview, but does not change the local coordinate system of the view s content. Setting the boundsRotation property changes the orientation of its content, but doesn t change its location in the superview. Setting the boundsOrigin property to something other than (0,0) shifts the coordinate system used by the view when drawing. NSView provides a raft of methods to convert between coordinate systems. The principal ones are -[NSView convertPoint:toView:] and -[NSView convertPoint:fromView:]. These take a coordinate in either the view s local coordinate system or the coordinate system of another view and convert it to the other. The other view can be any view within the window s view hierarchy. If the view object parameter is nil, it converts to or from the window s base coordinate system. There are also methods to convert coordinates between coordinate systems with arbitrary origins and an orthogonal set of methods that convert rectangle and size structures.
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