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copied!<p>In the control or layout container : </p> <ol> <li>define a <code>Dictionary<Control,int></code> which will hold a current height variable for each Control of interest.</li> </ol> <p><em>In the initial Layout :</em></p> <ol start="2"> <li><p>recurse through Controls of interest (if nested), or </p></li> <li><p>iterate through Controls of interest (if not nested) </p></li> </ol> <p>... use "standard" iteration or recursion, Linq recursion, or Linq "iteration" ... :</p> <p>... as you recurse, or iterate, make an entry in the Dictionary for each Control with its current height ...</p> <p>... attach a 'SizeChanged handler to each Control of interest that invokes the same method in your Layout Engine Class (possibly a static method ?) : for the sake of clarity : let's refer to that as the "Event Dispatch Code."</p> <p><em>In your Event Dispatch Code for all Controls of interest,</em> now triggered by a SizeChanged event on any of your "monitored" Controls : </p> <ol> <li><p>do a dictionary look-up using the Control as a key : get the Height property value and compare with the Control's current Height value : </p></li> <li><p>assuming the Height property has changed :</p></li> </ol> <p>a. call your Layout Engine to "do its thing."</p> <p>b. update Dictinary value for Height for that Control.</p> <p>Note : since the SizeChanged event is going to be called with 'sender as an 'object : you will need to cast it to type Control before accessing its 'Height property.</p> <p>Here's a "rough sketch" of what your code might look like :</p> <pre><code>// note : untested code : use caution ... test rigorously ... // stub for the Dictionary of monitored Controls private Dictionary<Control, int> LayoutManager_MonitoredControls = new Dictionary<Control, int>(); // the SizeChanged Event Handler you "install" for all Controls you wish to monitor private void LayoutManager_SizeChanged(object sender, EventArgs e) { Control theControl = sender as Control; int cHeight = theControl.Height; if (LayoutManager_MonitoredControls[theControl] != theControl.Height); { // update the Dictionary LayoutManager_MonitoredControls[theControl] = cHeight; // call your code to update the Layout here ... } } </code></pre>

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