Bug 9344 - in MonoMac, the method SetMinCoordinateofSubview of splitviewDelegate is never called for pane at the right of the split view.
Summary: in MonoMac, the method SetMinCoordinateofSubview of splitviewDelegate is neve...
Alias: None
Product: Xamarin.Mac
Classification: Desktop
Component: Library (Xamarin.Mac.dll) ()
Version: Master
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: 2.0.x
Assignee: Chris Hamons
Depends on:
Reported: 2013-01-07 16:58 UTC by micrond
Modified: 2015-02-19 16:53 UTC (History)
4 users (show)

Is this bug a regression?: ---
Last known good build:

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Description micrond 2013-01-07 16:58:33 UTC
I put a vertical splitview on my main windows. I want to make sure neither size is reduce more than a certain limit, so I add a delegate to it:
		//strongly typed window accessor
		public override void AwakeFromNib () {
			splitView.Delegate = new MainSplitViewDelegate ();

Here is my Split View delegate class:
	public class MainSplitViewDelegate : NSSplitViewDelegate
		readonly int[] MIN_WIDTH_PANE = {219, 300}; 

		public MainSplitViewDelegate () {

		/// <summary>
		/// Shoulds the size of the adjust.
		/// </summary>
		/// <returns>
		/// <c>true</c>, if adjust size was shoulded, <c>false</c> otherwise.
		/// </returns>
		/// <param name='splitView'>
		/// Split view.
		/// </param>
		/// <param name='view'>
		/// View.
		/// </param>
		/// \note used when resizing window
		public override bool ShouldAdjustSize (NSSplitView splitView, NSView view) {
			if (view == splitView.Subviews [0])
				return false;
				return (view.Frame.Size.Width > MIN_WIDTH_PANE [1]);

		/// <summary>
		/// Sets the minimum coordinateof subview.
		/// </summary>
		/// <returns>
		/// The minimum coordinateof subview.
		/// </returns>
		/// <param name='splitView'>
		/// Split view.
		/// </param>
		/// <param name='proposedMinimumPosition'>
		/// Proposed minimum position.
		/// </param>
		/// <param name='subviewDividerIndex'>
		/// Subview divider index.
		/// </param>
		/// \note called for left pane when dragging view handle
		public override float SetMinCoordinateofSubview (NSSplitView splitView, float proposedMinimumPosition, int subviewDividerIndex) {
			//if (subviewDividerIndex != 0)
			//	throw new System.NotImplementedException ();
			return MIN_WIDTH_PANE [subviewDividerIndex];

The error occurs in SetMinCoordinateofSubview. My goals was to make sure that neither side width is below MIN_WIDTH_PANE. The code above shows that the call to SetMinCoordinateofSubview is never done for the right pane because if we remove the comments, the exception is never thown which make it impossible to validate right pane min size.
Comment 2 Chris Hamons 2015-02-19 16:53:33 UTC

Sorry for the long delay in responding to this bug. It was misfiled and overlooked until now.

I took a look at your issue, and I don't believe it is a bug. If you add 3 items to your split view:


We do get the call in question. While NSSplitView is not obvious to use, we're correctly passing the calls Cocoa is making up to the user program.


If you are having trouble using an API, check out the forms for a place you can get some help: