Databases
StackOverflow2013
Postsdbo
PONSView Subclass drawRect gets called in an infinite Loop
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PONSView Subclass drawRect gets called in an infinite Loop
    primarykey
    data
    text
    <p>I created a Subclass a of NSView to create a custom UI including a NSTextView. Therefore I use the drawRect Method to draw my UI. I also created a Subclass of NSImageView to get a mousedown Event. Whenever I click into my Subclassed NSImageView the drawRect Method of my View gets called in an infinite Loop and I can't figure out why. Building custom UIs is new for me so maybe I'm doing something essentially wrong?</p> <p>TWIComposeFrameView.m:</p> <pre><code>#import "TWIComposeWindowFrameView.h" #import "TWIImageView.h" @implementation TWIComposeWindowFrameView #pragma mark draw Rect of the View // // drawRect: // // Draws the frame of the window. // - (void)drawRect:(NSRect)rect { //// Color Declarations NSColor* mainClrWhite = [NSColor colorWithCalibratedRed: 0.954 green: 0.954 blue: 0.954 alpha: 1]; NSColor* transpGrey = [NSColor colorWithCalibratedRed: 0.224 green: 0.224 blue: 0.224 alpha: 0.745]; NSColor* composeClrGrey = [NSColor colorWithCalibratedRed: 0.858 green: 0.842 blue: 0.842 alpha: 1]; //// Abstracted Attributes NSRect composeRectRect = NSMakeRect(20, 70, 475, 210); NSRect attachmentRectRect = NSMakeRect(499, 195, 85, 85); //// transpRect Drawing NSBezierPath* transpRectPath = [NSBezierPath bezierPathWithRoundedRect: NSMakeRect(1, 0, 599, 299) xRadius: 10 yRadius: 10]; [transpGrey setFill]; [transpRectPath fill]; //// mainRect Drawing NSBezierPath* mainRectPath = [NSBezierPath bezierPathWithRoundedRect: NSMakeRect(10, 10, 580, 280) xRadius: 10 yRadius: 10]; [mainClrWhite setFill]; [mainRectPath fill]; //// composeRect Drawing NSBezierPath* composeRectPath = [NSBezierPath bezierPathWithRoundedRect: composeRectRect xRadius: 10 yRadius: 10]; [composeClrGrey setFill]; [composeRectPath fill]; //// attachmentRect Drawing NSBezierPath* attachmentRectPath = [NSBezierPath bezierPathWithRoundedRect: attachmentRectRect xRadius: 10 yRadius: 10]; [mainClrWhite setFill]; [attachmentRectPath fill]; [composeClrGrey setStroke]; [attachmentRectPath setLineWidth: 1]; [attachmentRectPath stroke]; } - (id)initWithFrame:(NSRect)rect { if (![super initWithFrame:rect]) return nil; NSColor* composeClrGrey = [NSColor colorWithCalibratedRed: 0.858 green: 0.842 blue: 0.842 alpha: 1]; NSRect composeRectRect = NSMakeRect(20, 70, 475, 210); NSRect attachmentRectRect = NSMakeRect(499, 195, 85, 85); //// Add Controls [self addComposeTextView:composeClrGrey composeRectRect:composeRectRect]; [self addAttachmentImageView:attachmentRectRect]; return self; } #pragma mark - #pragma mark Add Controls to View // // Create and Add the Compose TextView // - (void)addComposeTextView:(NSColor *)composeClrGrey composeRectRect:(NSRect)composeRectRect { NSTextView *composeTextView; if (composeTextView == nil) { composeTextView = [[NSTextView alloc] initWithFrame:composeRectRect]; [composeTextView setBackgroundColor:composeClrGrey]; [composeTextView setFont:[NSFont fontWithName:@"Helvetica" size:18]]; [composeTextView setRichText:NO]; [self addSubview:composeTextView]; } } // // Create and Add the Attachemant ImageView // - (void)addAttachmentImageView:(NSRect)attachmentRectRect { NSImage *defaultImage = [NSImage imageNamed:@"168-upload-photo-2"]; NSRect ivRect = NSMakeRect(attachmentRectRect.origin.x + 5, attachmentRectRect.origin.y + 5, attachmentRectRect.size.width - 10, attachmentRectRect.size.height - 10); TWIImageView *imageView = [[TWIImageView alloc] initWithFrame:ivRect]; imageView.delegate = self; [imageView setEditable:YES]; [self addSubview:imageView]; [imageView setImage:defaultImage]; } #pragma mark - #pragma mark TWIImageView Delegate // // mouseDown Event on TWIImageView // - (void)myImageView:(TWIImageView *)view mouseDown:(NSEvent *)event { NSLog(@"imageView clicked"); } #pragma mark - @end </code></pre> <p>TWIImageView.h</p> <pre><code>@class TWIImageView; @protocol TWIImageViewDelegate &lt;NSObject&gt; - (void)myImageView:(TWIImageView *)view mouseDown:(NSEvent *)event; @end @interface TWIImageView : NSImageView { } @property (assign) id&lt;TWIImageViewDelegate&gt; delegate; @end </code></pre> <p>TWIImageView.m:</p> <pre><code>#import "TWIImageView.h" @implementation TWIImageView @synthesize delegate = _delegate; - (void)mouseDown:(NSEvent *)event { if([self.delegate respondsToSelector:@selector(myImageView:mouseDown:)]) { [self.delegate myImageView:self mouseDown:event]; } } @end </code></pre> <p>Is it wrong to create the controls in the overwritten initWithFrame Method? Or is my TWIImageView missing something important</p> <p>StackTrace:</p> <pre><code>Thread 1, Queue : com.apple.main-thread #0 0x0000000100001cd0 in -[TWIComposeWindowFrameView drawRect:] at /Users/thomaswickl/Documents/Development/Git Projects/QuickQuick/QuickQuick/TWIComposeWindowFrameView.m:24 #1 0x00007fff92efa170 in -[NSView _drawRect:clip:] () #2 0x00007fff92ef6fe3 in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView: ] () #3 0x00007fff92ef7a74 in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] () #4 0x00007fff93045fdb in -[NSNextStepFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] () #5 0x00007fff92ef1d9d in -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] () #6 0x00007fff92ebbcc3 in -[NSView displayIfNeeded] () #7 0x00007fff93045e94 in -[NSNextStepFrame displayIfNeeded] () #8 0x00007fff92ebb1fc in _handleWindowNeedsDisplayOrLayoutOrUpdateConstraints () #9 0x00007fff934868f1 in __83-[NSWindow _postWindowNeedsDisplayOrLayoutOrUpdateConstraintsUnlessPostingDisabled]_block_invoke_01208 () #10 0x00007fff92b39417 in __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ () #11 0x00007fff92b39381 in __CFRunLoopDoObservers () #12 0x00007fff92b147b8 in __CFRunLoopRun () #13 0x00007fff92b140e2 in CFRunLoopRunSpecific () #14 0x00007fff90ce8eb4 in RunCurrentEventLoopInMode () #15 0x00007fff90ce8b94 in ReceiveNextEventCommon () #16 0x00007fff90ce8ae3 in BlockUntilNextEventMatchingListInMode () #17 0x00007fff92eb8563 in _DPSNextEvent () #18 0x00007fff92eb7e22 in -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] () #19 0x00007fff92eaf1d3 in -[NSApplication run] () #20 0x00007fff92e53c06 in NSApplicationMain () #21 0x0000000100001242 in main at /Users/thomaswickl/Documents/Development/Git Projects/QuickQuick/QuickQuick/main.m:13 #22 0x00007fff955db7e1 in start () </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCaptnCrash
    1. USCaptnCrash
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. PONSView Subclass drawRect gets called in an infinite Loop
      1. This table or related slice is empty.
      1. VTUpMod
    1. COFrankly I do not see the loop. If there is one can't you just set a break point at the beginning of drawRect: and continue a couple of times and then look at the call stack which of the methods called actually invokes drawRect again and again?
      singulars
      1. PONSView Subclass drawRect gets called in an infinite Loop
      1. USHermann Klecker
    2. COYou might want to consider saving and restoring your graphics context during the `-drawRect:`. I don't know that it will solve your looping issue, but it will probably solve some problems down the road.
      singulars
      1. PONSView Subclass drawRect gets called in an infinite Loop
      1. USgaige
    3. COi can't see a looping issue in this code .I think its happening from somewhere else...just see if you are calling setNeedDisplay always (in a loop) !!!
      singulars
      1. PONSView Subclass drawRect gets called in an infinite Loop
      1. USarun.s
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload