Q: showing only the next layer and not the whole tree

Hi,

here is a small hack, which enables that feature. I added the following method to the PSBaseSubtree class:

(IBAction) toggleOneLevelExpansion:(id)sender { [UIView beginAnimations:@"TreeNodeExpansion" context:nil]; [UIView setAnimationDuration:0.5]; [UIView setAnimationBeginsFromCurrentState:YES]; // optional: set the animation curve: // UIViewAnimationCurveEaseIn: begins slowly, then speeds up // UIViewAnimationCurveEaseOut: begins fast, then slows down // UIViewAnimationCurveEaseInOut: begins slowly, faster in the middle, slows down at end // UIViewAnimationCurveLinear: same speed throughout [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; // optional: to execute code after the animation has finished, set the delegate:
[UIView setAnimationDelegate:self];

NSMutableArray ancestorsViews = [[NSMutableArray alloc]init]; UIView anAncestor = self; PSBaseSubtreeView rootView; while ([anAncestor isKindOfClass:[PSBaseSubtreeView class]] ) {
[ancestorsViews addObject:(PSBaseSubtreeView) anAncestor]; rootView = (PSBaseSubtreeView*) anAncestor; anAncestor = [anAncestor superview]; } // now we rebuild our path to the selected node // get parent node

UIView selectedView = self;
for (UIView ancestor in ancestorsViews) { NSArray childViews = [ancestor subviews]; for (UIView *childView in childViews) { if ([childView isKindOfClass:[PSBaseSubtreeView class]]) { // child view is a subtree if ([(PSBaseSubtreeView)childView isEqual:(PSBaseSubtreeView) selectedView]) { // toggle state [(PSBaseSubtreeView)childView setExpanded:TRUE]; // show next sub level of the selected node/view and hide all sub-sub levels
```
          if ([selectedView isEqual:self]) {
              NSArray *subLevelViews = [childView subviews];
              for (UIView *subLevelView in subLevelViews) {
                  if ([subLevelView isKindOfClass:[PSBaseSubtreeView class]]) {
                      [(PSBaseSubtreeView*)subLevelView setExpanded:FALSE];
                  }
                  if ([subLevelView isKindOfClass:[PSBaseLeafView class]]) {
                      [(PSBaseLeafView*)subLevelView setShowingSelected:FALSE];
                  }
              }
          }
          selectedView = (PSBaseSubtreeView*) ancestor;
      } else {            
          [(PSBaseSubtreeView*)childView setExpanded:FALSE]; // is o.k.
      } 
  }
      // handling of leaf views needed?
}
```
}

if ([rootView isKindOfClass:[PSBaseSubtreeView class]]) { [[rootView enclosingTreeGraph] setNeedsGraphLayout]; [[rootView enclosingTreeGraph] layoutGraphIfNeeded];

} else { NSLog(@"wrong root view class supplied: %@", [rootView description]); }

if ( [self modelNode] != nil ) { NSSet *visibleSet = [NSSet setWithObject:[self modelNode]]; [[self enclosingTreeGraph] scrollModelNodesToVisible:visibleSet animated:NO]; }

[UIView commitAnimations]; //NSLog(@"tree depth 1: %@", [self treeSummaryWithDepth:1]); [ancestorsViews release]; }

HTH Johannes

epreston / PSTreeGraph

Q: showing only the next layer and not the whole tree #13