Drawing Text With Attributes(Chapter 20 of Cocoa Programming for Mac OS X)

  1 #import "BigLetterView.h"
  2 
  3 
  4 @implementation BigLetterView
  5 
  6 - (IBAction)savePDF:(id)sender
  7 {
  8     NSSavePanel *panel = [NSSavePanel savePanel];
  9     [panel setRequiredFileType:@"pdf"];
 10     [panel beginSheetForDirectory:nil file:nil modalForWindow:[self window] modalDelegate:self didEndSelector:@selector(didEnd:returnCode:contextInfo:) contextInfo:NULL];
 11 }
 12 
 13 - (void)prepareAttributes
 14 {
 15     attributes = [[NSMutableDictionary alloc] init];
 16     [attributes setObject:[NSFont fontWithName:@"Helvetica" size:75] forKey:NSFontAttributeName];
 17     [attributes setObject:[NSColor redColor] forKey:NSForegroundColorAttributeName];
 18 }
 19 
 20 - (void)didEnd:(NSSavePanel    *)sheet returnCode:(int)code contextInfo:(void *)contextInfo
 21 {
 22     if(code != NSOKButton)
 23     {
 24         return;
 25     }
 26     
 27     NSRect r = [self bounds];
 28     NSData *data = [self dataWithPDFInsideRect:r];
 29     NSString *path = [sheet filename];
 30     NSError *error;
 31     BOOL successful = [data writeToFile:path options:0 error:&error];
 32     if (!successful) 
 33     {
 34         NSAlert *a = [NSAlert alertWithError:error];
 35         [a runModal];
 36     }
 37 }
 38 
 39 - (id)initWithFrame:(NSRect)frameRect
 40 {
 41     if(![super initWithFrame:frameRect])
 42     {
 43         return nil;
 44     }
 45     
 46     NSLog(@"initializing view");
 47     [self prepareAttributes];
 48     bgColor = [[NSColor yellowColor] retain];
 49     string = @" ";
 50     return self;
 51 }
 52 
 53 - (void)dealloc
 54 {
 55     [bgColor release];
 56     [string release];
 57     [attributes release];
 58     [super dealloc];
 59 }
 60 
 61 - (void)drawRect:(NSRect)dirtyRect
 62 {
 63     NSRect bounds = [self bounds];
 64     [bgColor set];
 65     [NSBezierPath fillRect:bounds];
 66     [self drawStringCenteredIn:bounds];
 67     
 68     if([[self window] firstResponder] == self)
 69     {
 70         [[NSColor keyboardFocusIndicatorColor] set];
 71         [NSBezierPath setDefaultLineWidth:4.0];
 72         [NSBezierPath strokeRect:bounds];
 73     }
 74 }
 75 
 76 - (BOOL)isOpaque
 77 {
 78     return YES;
 79 }
 80 
 81 - (BOOL)acceptsFirstResponder
 82 {
 83     NSLog(@"Accepting");
 84     return YES;
 85 }
 86 
 87 - (BOOL)resignFirstResponder
 88 {
 89     NSLog(@"Resigning");
 90     [self setNeedsDisplay:YES];
 91     return YES;
 92 }
 93 
 94 - (BOOL)becomeFirstResponder
 95 {
 96     NSLog(@"Becoming");
 97     [self setNeedsDisplay:YES];
 98     return YES;
 99 }
100 
101 - (void)keyDown:(NSEvent *)theEvent
102 {
103     [self interpretKeyEvents:[NSArray arrayWithObject:theEvent]];
104 }
105 
106 - (void)insertText:(NSString *)input
107 {
108     [self setString:input];
109 }
110 
111 - (void)insertTab:(id)sender
112 {
113     [[self window] selectKeyViewPrecedingView:self];
114 }
115 
116 - (void)deleteBackward:(id)sender
117 {
118     [self setString:@" "];
119 }
120 
121 #pragma mark Accessors
122 
123 - (void)setBgColor:(NSColor *)c
124 {
125     [c retain];
126     [bgColor release];
127     bgColor = c;
128     [self setNeedsDisplay:YES];
129 }
130 
131 - (NSColor *)bgColor
132 {
133     return bgColor;
134 }
135 
136 - (void)drawStringCenteredIn:(NSRect)r
137 {
138     NSSize strSize = [string sizeWithAttributes:attributes];
139     NSPoint strOrigin;
140     strOrigin.x = r.origin.x + (r.size.width - strSize.width)/2;
141     strOrigin.y = r.origin.y + (r.size.height - strSize.height)/2;
142     [string drawAtPoint:strOrigin withAttributes:attributes];
143 }
144 
145 - (void)setString:(NSString *)c
146 {
147     c = [c copy];
148     [string release];
149     string = c;
150     NSLog(@"The string is now %@", string);
151     [self setNeedsDisplay:YES];
152 }
153 
154 - (NSString *)string
155 {
156     return string;
157 }
158 
159 @end