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POHow to listen DataContext change to adjust UI state accordingly
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copied!<p>This question is taking roots from discussion inside <a href="https://github.com/slodge/MvvmCross/issues/367" rel="nofollow">https://github.com/slodge/MvvmCross/issues/367</a> thread. </p> <p>If we're following the recent examples of setting up Bindings with MvvmCross framework then we just setup bindings to control properties (like UILabel.Text) using Bind(), To() extensions:</p> <pre class="lang-cs prettyprint-override"><code>this.DelayBind(() => { var set = this.CreateBindingSet<KittenCollectionCell, Kitten>(); set.Bind(NameLabel).To(kitten => kitten.Name); set.Bind(PriceLabel).To(kitten => kitten.Price); set.Bind(_loader).To(kitten => kitten.ImageUrl); set.Apply(); }); </code></pre> <p>(taken from <a href="https://github.com/slodge/NPlus1DaysOfMvvmCross/blob/master/N-11-KittenView_Collections/KittenView.Touch/Views/KittenCollectionCell.cs" rel="nofollow">https://github.com/slodge/NPlus1DaysOfMvvmCross/blob/master/N-11-KittenView_Collections/KittenView.Touch/Views/KittenCollectionCell.cs</a>)</p> <p>But what if I want to adjust my UI state basing on some values from DataContext. For example I would like to show/hide some buttons and labels and to adjust some constraint values.</p> <pre class="lang-cs prettyprint-override"><code>if (((UserInfo)DataContext).IsAdmin) { SaveButton.Hidden = false; SecurityLabelConstraint.Constant = 50; /* etc */ } </code></pre> <p>How I can listen DataContext change event? What's the recommended approach here?</p> <p>Thanks.</p>

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