Re: Re: redrawing an NSPopUpButtonCell, and ghost effect

FROM : Ender Wiggins
DATE : Sun Aug 13 03:36:37 2006

Thanks Pat, I see what you mean, I'll work on this as soon as I get
another problem out of the way, this is helpful.

On 8/11/06, PGM <<email_removed>> wrote:
> For my own tableView headerCell troubles, I worked around the "ghost
> column" problem by using the following code in a subclass of
> NSTableHeaderCell:
>
> - (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView *)
> controlView
> {
>      //this method is also called for the headerCell of the ghost column
>      [super drawInteriorWithFrame:cellFrame inView:controlView];
>
>      //don't draw any additional stuff if value is not set
> (otherwise empty column at end is also drawn)
>      if([[self title] length]){
>        //some custom drawing for my headerCell that I do not want in the
> ghost column
>      }
> }
>
> You can subclass NSpopUpButtonCell to achieve more or less the same,
> something like:
>
> - (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView *)
> controlView
> {
>      if(someFlag){
>              //if not last column, draw the popUp
>            [super drawInteriorWithFrame:cellFrame inView:controlView];
>      }
>      else{
>          //draw some background
>      }
> }
>
> Then you have to initialise the instance variable "someFlag" to NO,
> and make an accessor so that you can set it to YES for every column
> you create. Alternatively there may be some property of the cell that
> the ghost column does not have, but all others do, and test for that.
>
> Best, Patrick
>
>
>
> On 10-Aug-06, at 22:01 PM, Ender Wiggins wrote:
>
> > I have a new problem by putting an NSPopUpButtonCell within my tables
> > headers by subclassing NSTableHeaderView.
> >
> > #1 If I setBordered:NO on the NSPopUpButtonCell, then once I select
> > the button by pressing mouse down, the cell seems to draw the newly
> > selected item text on top of the previous item text without clearing
> > it first. If I set it to YES, then it displays the new selection
> > within the cell just fine, but of course, shows the border that I
> > don't want.
> >
> > One thing to note here is that, if I tab over to another NSView, and
> > then click on a tab which brings this tabbed pane back up, the
> > NSTableView headers are redisplayed correctly and cleanly. I tried
> > setNeedsDisplay, but that didn't do anything to it.
> >
> > #2 The other problem is that the NSTableHeaderView has 4 columns, but
> > shows a 5th column as well, like a ghost effect of what's in the 4th.
> > If I select the mouseDown on the 5th column, my mouseDown debug output
> > displays a -1 for that column (like it doesn't exist, but it shows
> > up), but clicking on the other 4 columns show output correctly from 0
> > to 3. Clicking on other tab buttons and coming back to this
> > NSTableView screen don't clear out the 5th column problem.
> >
> > Here is how my popup button cells are created in the columns.
> > [code]
> >      NSString *col = [columnItems objectAtIndex:i];
> >
> >      headerCell = [[NSPopUpButtonCell alloc] initTextCell:col];
> >      [headerCell setPullsDown:NO];
> >      [headerCell setControlSize:NSMiniControlSize];
> >      [headerCell setBordered:YES];
> >      [headerCell setEditable:YES];
> >      [headerCell setControlView:[tableView headerView]];
> >      [headerCell setFont:[NSFont labelFontOfSize:
> >              [NSFont smallSystemFontSize]]];
> >
> >      [headerCell addItemWithTitle:@"Item A"];
> >      [headerCell addItemWithTitle:@"Item B"];
> >      [headerCell addItemWithTitle:@"Item C"];
> >
> >      column = [[NSTableColumn alloc]
> >              initWithIdentifier:[NSNumber numberWithInt:i]];
> >
> >      [column setHeaderCell:headerCell];
> >      [headerCell release];
> >
> >      [tableView addTableColumn:column];
> >      [column release];
> > [/code]
> >
> > This is my class subclassed from NSTableHeaderView, mouseDown method.
> > [code]
> > - (void)mouseDown:(NSEvent *)event
> > {
> >      NSPoint point = [event locationInWindow];
> >
> >      int column = [self columnAtPoint:[self convertPoint:point
> > fromView:nil]];
> >      NSLog(@"column: %d", column);
> >
> >      if (column >= 0) {
> >              NSTableColumn *col = [[[self tableView] tableColumns]
> >                      objectAtIndex:column];
> >
> >              [[col headerCell] trackMouse:event
> >                      inRect:[self headerRectOfColumn:column]
> >                      ofView:self untilMouseUp:NO];
> >
> >              NSLog(@"selected %@", [[[col headerCell] selectedItem] title]);
> >              [[col headerCell] setTitle:[[[col headerCell] selectedItem] title]];
> >
> >              [self setNeedsDisplay:YES];
> >      } else {
> >              [super mouseDown:event];
> >      }
> > }
> >
> > [/code]
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