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POHow to get FrameworkElement properties before its unloading
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  1. POHow to get FrameworkElement properties before its unloading
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    copied!<p>It is need to realize UI settings system - loading/saving some properites of UI elements (which can be modified by user in runtime) from/into persistent storage. For example:</p> <ul> <li>DevExpress grid control - columns width's, visibility, summary area and so on (this control has set of methods pairs like RestoreLayoutFrom/SaveLayoutTo, but SaveLayoutToStream(Xml) doesnt work in grid.Unloaded handler - when grid is disconnected from PresentationSource)</li> <li>grid rows/columns, which widths/heights can be adjusted by user via GridSplitter</li> <li>sizeable popup controls</li> </ul> <p>It is easy to set up controls properties from settings storage after controls loading/initializing/etc, but how catch the moment before controls unloading (when they still remains in visual tree) in order to retrieve their settings for saving?</p> <h2>Short description</h2> <p>I intend to create singleton - UISettingsManager, which inside has a Dictionary with pairs of [element Uid, element settings data]. In visual container (Window, UserControl) this manager can be used in a way like this:</p> <pre><code>public partial class PageHeader : UserControl { public PageHeader() { InitializeComponent(); UISettingsManager.RestoreSettings(myGridControl); UISettingsManager.RestoreSettings(myPopup); } } </code></pre> <p>myGridControl &amp; myPopup has unique Uid's (in application scope), so UISettingsManager can retrieve their settings from inner dictionary &amp; apply it to the controls; of course UISettingsManager knows, how to work with some different types of controls. </p> <p>But when it is the right moment to store settings of controls, which container is Window or UserControl?</p>
 

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