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Resize NSSplitView Nicely

/ Published in: Objective C
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This provides a nice split view resizing method with a minimum size restraint. You HAVE to specify MIN_LEFT_PANE_W for this to work.

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  1. - (void) splitView:(NSSplitView *)sender resizeSubviewsWithOldSize:(NSSize)oldSize {
  2. 	// http://www.wodeveloper.com/omniLists/macosx-dev/2003/May/msg00261.html
  3.  
  4. 	// grab the splitviews
  5.     NSView *left = [[sender subviews] objectAtIndex:0];
  6.     NSView *right = [[sender subviews] objectAtIndex:1];
  7.  
  8.     float dividerThickness = [sender dividerThickness];
  9.  
  10. 	// get the different frames
  11.     NSRect newFrame = [sender frame];
  12.     NSRect leftFrame = [left frame];
  13.     NSRect rightFrame = [right frame];
  14.  
  15. 	// change in width for this redraw
  16. 	int	dWidth  = newFrame.size.width - oldSize.width;
  17.  
  18. 	// ratio of the left frame width to the right used for resize speed when both panes are being resized
  19. 	float rLeftRight = (leftFrame.size.width - MIN_LEFT_PANEL_W) / rightFrame.size.width;
  20.  
  21. 	// resize the height of the left
  22.     leftFrame.size.height = newFrame.size.height;
  23.     leftFrame.origin = NSMakePoint(0,0);
  24.  
  25. 	// resize the left & right pane equally if we are shrinking the frame
  26. 	// resize the right pane only if we are increasing the frame
  27. 	// when resizing lock at minimum width for the left panel
  28. 	if(leftFrame.size.width <= MIN_LEFT_PANEL_W && dWidth < 0) {
  29. 		rightFrame.size.width += dWidth;
  30. 	} else if(dWidth > 0) {
  31. 		rightFrame.size.width += dWidth;
  32. 	} else {
  33. 		leftFrame.size.width += dWidth * rLeftRight;
  34. 		rightFrame.size.width += dWidth * (1 - rLeftRight);
  35. 	}
  36.  
  37.     rightFrame.size.width = newFrame.size.width - leftFrame.size.width - dividerThickness;
  38.     rightFrame.size.height = newFrame.size.height;
  39.     rightFrame.origin.x = leftFrame.size.width + dividerThickness;
  40.  
  41.     [left setFrame:leftFrame];
  42.     [right setFrame:rightFrame];
  43. }

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