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POInvalidate Form After CollectionEditor Changes Collection
 

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  1. POInvalidate Form After CollectionEditor Changes Collection
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    <p>I have user control which contains a list of objects called "ToolbarButton". A ToolbarButton represents a user button which will be added to the user control.</p> <p>My class looks like this </p> <pre><code>public partial class Toolbar : UserControl { private MyCollection&lt;ToolbarButton&gt; _buttons = new MyCollection&lt;ToolbarButton&gt;(); public Toolbar() { InitializeComponent(); ToolbarCollectionEditor.toolbar = this; } [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] [Editor(typeof(ToolbarCollectionEditor), typeof(System.Drawing.Design.UITypeEditor))] public MyCollection&lt;ToolbarButton&gt; Buttons { get { return _buttons; } } } </code></pre> <p>As you can see I have also implemented the Collection Editor so that I can modify the list during design time. </p> <p>This all works fine, what I am having a problem with is getting the control to redraw when a change is made to the list. I have tried adding an event to listen for a change to the list of objects (my custom list class called MyCollection) but because the CollectionEditor just seems to rewrite the designer code and not refresh it this didnt work.</p> <p>Can anyone tell me how I can do this? Eventually I would like to be able to click the Add button in the Collection Editor and have the control refresh and show the new buttons I have added.</p> <p>Thanks in advance!</p> <p><strong>Update:</strong></p> <p>I have created my own CollectionEditor</p> <pre><code>class ToolbarCollectionEditor : CollectionEditor { public ToolbarCollectionEditor(Type type) : base(type) { } public static Toolbar toolbar; protected override CollectionForm CreateCollectionForm() { CollectionForm collectionForm = base.CreateCollectionForm(); collectionForm.FormClosed += new FormClosedEventHandler(collectionForm_FormClosed); collectionForm.Load += new EventHandler(collectionForm_Load); if (collectionForm.Controls.Count &gt; 0) { TableLayoutPanel mainPanel = collectionForm.Controls[0] as TableLayoutPanel; if ((mainPanel != null) &amp;&amp; (mainPanel.Controls.Count &gt; 7)) { // Get a reference to the inner PropertyGrid and hook // an event handler to it. PropertyGrid propertyGrid = mainPanel.Controls[5] as PropertyGrid; if (propertyGrid != null) { propertyGrid.PropertyValueChanged += new PropertyValueChangedEventHandler( propertyGrid_PropertyValueChanged); } // Also hook to the Add/Remove TableLayoutPanel buttonPanel = mainPanel.Controls[1] as TableLayoutPanel; if ((buttonPanel != null) &amp;&amp; (buttonPanel.Controls.Count &gt; 1)) { Button addButton = buttonPanel.Controls[0] as Button; if (addButton != null) { addButton.Click += new EventHandler(addButton_Click); } Button removeButton = buttonPanel.Controls[1] as Button; if (removeButton != null) { removeButton.Click += new EventHandler(removeButton_Click); } } } } return collectionForm; } private static void collectionForm_FormClosed(object sender, FormClosedEventArgs e) { toolbar.RedrawButtons(); } private static void collectionForm_Load(object sender, EventArgs e) { } private static void propertyGrid_PropertyValueChanged(object sender, PropertyValueChangedEventArgs e) { } private static void addButton_Click(object sender, EventArgs e) { toolbar.RedrawButtons(); } private static void removeButton_Click(object sender, EventArgs e) { toolbar.RedrawButtons(); } } </code></pre>
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    1. PTQuestion
    1. USChristopher Townsend
    1. USChristopher Townsend
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    1. COMaking own editor and then performing refresh shouldn't be a problem or? The default is anyway ugly.
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      1. POInvalidate Form After CollectionEditor Changes Collection
      1. USSinatr
    2. COThis mishap isn't just a design-time problem, it goes wrong the exact same way at runtime. Code can use your property getter and add a button, your UI will not update either. Returning mutable collections from a property just is not a very good idea. An observable collection or a dedicated collection type are workarounds. Adding a setter is a Q&D fix.
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      1. POInvalidate Form After CollectionEditor Changes Collection
      1. USHans Passant
 

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