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POHow do I prevent duplicate code inside 2 drawRect: methods?
 

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  1. POHow do I prevent duplicate code inside 2 drawRect: methods?
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    <p>I have a few lines of drawing code that are duplicated in two different subclasses. When I move this drawing code to its own class and then call it from within <code>drawRect</code>: it is called but it is never drawn to the screen. What is the right way prevent duplicating code in two different <code>drawRect</code>: methods?</p> <p>Details: I'm making a custom control by subclassing <code>NSTableView</code> and <code>NSTableCellView</code>. My drawing code needs to be in <code>drawRect</code>: in both of these subclasses.</p> <p>I created a subclass of NSObject that declares one method. Here is the implementation:</p> <pre><code>@implementation TNLChartDrawingExtras - (void)drawDividersInRect:(NSRect)rect startingAtDate:(NSDate *)startDate withZoomFactor:(NSNumber *)zoomFactor { float pos = 0; NSDate *currentDate = [startDate copy]; while (pos &lt; rect.size.width) { //draw the vertical divider NSBezierPath *linePath = [NSBezierPath bezierPathWithRect:NSMakeRect(pos, 0.0, 1.0, rect.size.height)]; [[NSColor colorWithCalibratedWhite:0.85 alpha:0.5] set]; [linePath fill]; //increment the values for the next day currentDate = [NSDate dateWithTimeInterval:86400 sinceDate:currentDate]; // add one day to the current date pos = pos + (86400.0/ [zoomFactor floatValue]); } } </code></pre> <p>In my NSTableView subclass I define a property for this object. Then in <code>awakeFromNib</code> I create an instance of this class:</p> <pre><code>- (void)awakeFromNib { self.extras = [[TNLChartDrawingExtras alloc] init]; } </code></pre> <p>In <code>drawRect:</code> I send this message:</p> <pre><code>- (void)drawRect:(NSRect)dirtyRect { // more code here... [self.extras drawDividersInRect:viewBounds startingAtDate:chart.startDate withZoomFactor:self.zoomFactor]; } </code></pre> <p>The code is executed but the lines it is supposed to draw don't appear. If I put the code from <code>drawDividersInRect:...</code> in the <code>drawRect:</code> method, it works fine.</p>
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    1. USMike T
    1. USMike T
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    1. COYou should add some code so that we can see what you are already trying.
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      1. POHow do I prevent duplicate code inside 2 drawRect: methods?
      1. USMatt
    2. COHave you checked `self.extras` is not `nil`? That would explain it.
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      1. USdjromero
 

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