Re: PlotIconRefInContext doesn't work

FROM : Mike
DATE : Sat May 17 22:16:56 2008

Michael Babin wrote:
>
> On May 17, 2008, at 10:06 AM, Michael Vannorsdel wrote:
>

>> I'm thinking the window might be redrawing itself right after your own
>> drawing and erasing it.  You could try disabling the window's auto
>> displaying and flush the window buffer after your draw to determine if
>> this is the case.
>>
>> I don't know where you're doing the drawing to know if it's safe from
>> being erased or not.
>>
>>
>> On May 17, 2008, at 12:37 AM, Mike wrote:
>>

>>> It's a local NSRect which I assume is interchangeable with CGRect as
>>> they are the same.
>>>
>>> I fill in the rect at the top of the method with the Rect of the item
>>> in the window from IB and then I hide the item before drawing to
>>> prevent my stuff from being drawn over.
>>>
>>> CGContextFillRect doesn't do anything either. Just a blank space as
>>> with PlotIconRefInContext.

>
> If that were indeed the problem (some other drawing taking place after
> his own and erasing it), an easier way to check for it would be to use
> Quartz Debug, turn on "Autoflush drawing", set a breakpoint at the
> CGContextFillRect call, and step over it to see if the rect is indeed
> filled as expected.


I tried adding a -display message at the end of the method which forces
a flush, but nothing changed. This is for an about box window. One
question I have is: do I need to subclass NSWindow and then override the
drawing and updating methods in order to get this to work? I will give
Quartz Debug a try. Here is the entire method:

/////////////////////////////////////////////////////////////////////
// Display the About box and fill it with version and system info.
/////////////////////////////////////////////////////////////////////

- (IBAction)about:(id)sender
{
unsigned        len = 0;
NSRect            iconRectNS = { 0, 0, 0, 0 };

CGContextRef        windowContext = NULL;
RGBColor        inLabelColor = { 1, 1, 1 };

IconRef            icon = NULL;
NSGraphicsContext    *a = nil;
NSString        *aboutNameString = nil;
NSString        *bundleGetInfoString = nil;
NSString        *aboutFinalString = nil;
NSString        *tempHardwareInfoString = nil;
NSFont            *newFont = nil;
NSRange                        theActualTextUpperStorageRange;
NSTextStorage        *theActualTextUpperStorage = nil;
NSMutableAttributedString *theActualTextUpperStorageAsString = nil;
NSRange            theActualTextLowerStorageRange;
NSTextStorage        *theActualTextLowerStorage = nil;
NSMutableAttributedString *theActualTextLowerStorageAsString = nil;
OSStatus        err = noErr;
   
if( aboutWindow && mainWindow && model && helpMenu &&
aboutWindowLowerTextView && aboutWindowUpperTextView )
{
   // Center the about window...
       
   [ aboutWindow center ];
       
   [ aboutWindow useOptimizedDrawing:YES ];
       
   // Make font
       
   newFont = [ NSFont fontWithName:kHelveticaFontName
size:kAboutBoxFontSize ];
       
   ////////////////////////////////////////////////////
   // Make usable text for the about box upper pane...
   ////////////////////////////////////////////////////
       
   // Get about name string...
       
   aboutNameString = [ [ NSBundle mainBundle ]
localizedStringForKey:kWSAppAboutNameStringKey value:nil table:nil ];
       
   // Append CFBundleGetInfoString string...
       
   bundleGetInfoString = [ [ NSBundle mainBundle ]
objectForInfoDictionaryKey:(NSString*)kCFBundleGetInfoCFStringKey ];
       
   // Make final string for upper pane...
       
   aboutFinalString = [ aboutNameString
stringByAppendingString:bundleGetInfoString ];
if( aboutFinalString )
{
   ////////////////////////////////////////////////
   // Set the text in the about box upper pane...
   ////////////////////////////////////////////////
           
   // Get refs to text view's NSTextStorage's...
                   
   theActualTextUpperStorage = [ aboutWindowUpperTextView textStorage ];
   if( theActualTextUpperStorage )
   {
       // Get text storage's text...
               
       theActualTextUpperStorageAsString = (NSMutableAttributedString*)[
theActualTextUpperStorage mutableString ];
if( theActualTextUpperStorageAsString )
{
   // Make range for old text...
                   
memset( &theActualTextUpperStorageRange, kMemsetBufferFillValue, sizeof(
theActualTextUpperStorageRange ) );

len = [ theActualTextUpperStorageAsString length ];
                   
theActualTextUpperStorageRange = NSMakeRange( 0, len );
                   
// Replace upper text!
                       
[ theActualTextUpperStorage
replaceCharactersInRange:theActualTextUpperStorageRange
withString:aboutFinalString ];
               }
               
// Set font...
               
[ theActualTextUpperStorage setFont:newFont ];
}
           
// Force data model to reload hardware info...
           
[ model loadHardwareInfo ];
           
/////////////////////////////////////////////
// Make usable text for the bottom pane...
/////////////////////////////////////////////
           
theActualTextLowerStorage = [ aboutWindowLowerTextView textStorage ];
if( theActualTextLowerStorage )
{
   // Get text storage's text...
       
theActualTextLowerStorageAsString = (NSMutableAttributedString*)[
theActualTextLowerStorage mutableString ];
if( theActualTextLowerStorageAsString )
{
   // Make range for old text...
                   
memset( &theActualTextLowerStorageRange, kMemsetBufferFillValue, sizeof(
theActualTextLowerStorageRange ) );

len = [ theActualTextLowerStorageAsString length ];
                   
theActualTextLowerStorageRange = NSMakeRange( 0, len );
                   
// Replace lower text!
                       
tempHardwareInfoString = [ model hardwareInfoString ];
                   
[ theActualTextLowerStorage
replaceCharactersInRange:theActualTextLowerStorageRange
withString:tempHardwareInfoString ];
}
               
// Set font...
               
[ theActualTextLowerStorage setFont:newFont ];
}

// Order main window to back...
           
[ mainWindow orderBack:self ];
           
// Make sure the about window's level is in front of the shielding
window level...
           
[ aboutWindow setLevel:( CGShieldingWindowLevel() + 1 ) ];
           
// Make about window frontmost...
           
[ aboutWindow makeKeyAndOrderFront:self ];
           
// Plot the machine icon, if available...
           
if( model && aboutWindowMachineIcon )
           {
// Copy the rect to a new NSRect to modify...
               
iconRectNS = [ aboutWindowMachineIcon frame ];
               
[ aboutWindowMachineIcon setHidden:YES ];
               
[ aboutWindowMachineIcon setNeedsDisplay:NO ];

// Set context...
               
a = [ NSGraphicsContext graphicsContextWithWindow:aboutWindow ];
if( a )
{
   [ NSGraphicsContext setCurrentContext:a ];
               
   // Get window's context...
                   
   windowContext = [ [ NSGraphicsContext currentContext ] graphicsPort ];
   if( windowContext )
   {
       // Plot!
                   
       GetIconRef( kOnSystemDisk, kSystemIconsCreator, kFinderIcon, &icon );
                           
       err = PlotIconRefInContext(    windowContext,
                                                   (CGRect*)&iconRectNS,
                                                   kAlignAbsoluteCenter,
                                                   kTransformNone,
                                                   &inLabelColor,
                                                   kPlotIconRefNormalFlags,
                                                   icon    );
   }
}
}
           
// Last, force the selected menu item on the About menu to be "Help"...
           
[ helpMenu selectItemAtIndex:0 ];
           
[ helpMenu setNeedsDisplay:YES ];
           
// Force update in about window...
           
[ aboutWindow display ];
       }
   }
}