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POBinding a Canvas to a Canvas in WPF
 

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  1. POBinding a Canvas to a Canvas in WPF
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    <p>I have a class called "WaferMap" that draws rectangles its own canvas. There is also a canvas in the main view as well. I want to be able to bind the content of the canvas in the WaferMap class to the canvas on the GUI. What is the best way to do this?</p> <p>The way I am doing it now is creating a canvas in the WaferMap class and then binding it to the canvas on the GUI using the ContentPresenter property of the canvas.</p> <p><strong>WaferMap class:</strong></p> <pre><code>public class WaferMap : ViewModelBase { #region Fields protected const int rows = 23; protected const int cols = 23; protected int currentRow; protected int currentCol; protected DiePrint diePrint; protected List&lt;BlueTape&gt; blueTapeList; protected Canvas canvasToMap; #endregion #region Constructor public WaferMap(List&lt;BlueTape&gt; btList) { blueTapeList = new List&lt;BlueTape&gt;(); blueTapeList = btList; } #endregion #region Properties public Canvas WaferMapCanvas { get { return canvasToMap; } } public List&lt;BlueTape&gt; BlueTapeList { get { return blueTapeList; } } #endregion #region Methods public void DrawWaferMap() { if (blueTapeList.Count &gt; 0) { canvasToMap = new Canvas(); foreach (BlueTape bt in blueTapeList) { if (bt.DiePrintList.Count &gt; 0) { foreach (DiePrint print in bt.DiePrintList) { // Create a new DiePrintRectangle and get its // row and column coordinates DiePrintRectangle diePrintRect = new DiePrintRectangle(print); // Add the print to the canvas canvasToMap.Children.Add(diePrintRect); // Set the properties Thickness margin = new Thickness(0); diePrintRect.Margin = margin; diePrintRect.Height = 25; diePrintRect.Width = diePrintRect.Height; diePrintRect.HorizontalAlignment = HorizontalAlignment.Left; diePrintRect.VerticalAlignment = VerticalAlignment.Top; currentCol = Convert.ToInt32(print.Col * diePrintRect.Height); currentRow = Convert.ToInt32(print.Row * diePrintRect.Height); print.MapCol = currentCol; print.MapRow = currentRow; Canvas.SetLeft(diePrintRect, currentCol); Canvas.SetTop(diePrintRect, currentRow); // Get the color of the print fill and stroke //diePrintRect.Stroke = GetDiePrintColor(bt); diePrintRect.StrokeThickness = 12; diePrintRect.Stroke = GetDiePrintColor(bt); diePrintRect.Fill = Brushes.Transparent; diePrintRect.MouseDown += diePrintRect_MouseDown; diePrintRect.MouseEnter += diePrintRect_MouseEnter; } } } } } } </code></pre> <p>And here is my XAML:</p> <pre><code> &lt;DockPanel&gt; &lt;Canvas Name="mapCanvas"&gt; &lt;ContentPresenter Content="{Binding WaferMap}"/&gt; &lt;/Canvas&gt; &lt;/DockPanel&gt; </code></pre> <p><strong>And in the code behind:</strong></p> <p><em>NOTE</em>: I have this setup for debugging the binding. When the button "btnDoStuff" gets clicked, it will set the datacontext of the canvas on the GUI.</p> <pre><code>public partial class WaferTrackerWindow : Window { WaferTrackerWindowViewModel wtw; public WaferTrackerWindow() { InitializeComponent(); SelectWaferButtonViewModel swbv = new SelectWaferButtonViewModel(); wtw = new WaferTrackerWindowViewModel(tvwWaferList, txtFilter); wtw.SelectWaferButtonViewModel = swbv; tvwDockPanel.DataContext = wtw.SelectWaferButtonViewModel; DataContext = wtw; btnChooseWafer.DataContext = wtw; btnSelectWafer.DataContext = wtw; btnExit.DataContext = wtw; tbkWafer.DataContext = wtw; btnDoStuff.Click += btnDoStuff_Click; } private void btnDoStuff_Click(object sender, RoutedEventArgs e) { mapCanvas.DataContext = wtw.WaferMap.WaferMapCanvas; } </code></pre> <p>For some reason, this is not working. Any help would greatly appreciated. </p> <p>Is there a better way I should be doing this other than creating a canvas in a class and trying to bind it to a canvas in the view? </p> <p>Thanks in advanced!</p>
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    1. USRajeshKdev
    1. USkformeck
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    1. COPerhaps your Binding should be on the WaferMapCanvas property...looks like you used the class name WaferMap by mistake.
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      1. USColin Smith
 

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