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ObservableCollection<NameValuePair> dataPoints = new ObservableCollection<NameValuePair>();
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private void UserControl_Loaded(object sender, RoutedEventArgs e)
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{ Binding binding = new Binding(); Binds binding.Source = dataPoints; valuesList.SetBinding(ListBox.ItemsSourceProperty, binding); }
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Obviously this isn t a complete code listing. The using statement b is needed for ObservableCollection and has to go at the top of the file with the other using statements. ObservableCollection is a generic collection, so it takes the type of the item we want to collect NameValuePair c. We then do the binding in the class s Loaded event handler d. What we re doing here is more or less what the XAML compiler ends up doing behind the scenes. We have to create a Binding object and specify its source (the collection). Then we call SetBinding on our ListBox, specifying that we re binding the ItemSource property of the ListBox to our newly created Binding object, which points to our collection. Now, if we add an item to the collection, it will automatically show up in the ListBox.
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dataPoints.Add(new NameValuePair("First", 10));
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We want to add an item to the ListBox when the user hits the Add button after typing in a name and a value. To handle the operation, we add a handler for the Click event on the button and implement it like this:
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private void addValueBtn_Click(object sender, RoutedEventArgs e) { string name = addValueNameTextBox.Text.Trim(); string valueAsString = addValueValueTextBox.Text.Trim(); double valueAsDouble = Convert.ToDouble(valueAsString); NameValuePair nvp = new NameValuePair(name, valueAsDouble); dataPoints.Add(nvp); addValueNameTextBox.Text = ""; addValueValueTextBox.Text = ""; }
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To save space, we ve omitted the validation code that should be here. In the version on the web, we also have code to edit and remove items, but none of that is related to drawing, so we won t bother showing it here. Congratulations! If you ve followed along, you ve now successfully built a control that, uh, lets you add values to a ListBox. Your mother would be very proud. Of course, the point of this whole exercise was to demonstrate using shapes to graph our data points. We ll implement that now.
14.2.2 Graphing using shapes In listing 14.1, we had a reference to a control called ColumnGraphCtrl that we hadn t yet defined. Let s go ahead and create it now by adding a new user control. We re going to concentrate on the column chart for the moment. We could take a couple of different approaches here. For example, we could use a StackPanel, and then put on
Drawing
a series of rectangles to represent the values. That setup would work fairly well for column or bar charts, but not so well for line or pie charts. Instead, we re going to use a Canvas layout and calculate the sizes and positions ourselves. This may not be the best approach for a column chart, but it will serve us well later when we discuss other drawing approaches. It also means that the XAML for the control will be simple because we re going to drag on a Canvas and make it take up the entire available space.
<UserControl x:Class="GraphingWithShapes.ColumnGraphCtrl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="300" Width="300"> <Grid> <Canvas x:Name="main" SizeChanged="main_SizeChanged"/> </Grid> </UserControl>
We ve renamed the Canvas as main and also added an event handler for the SizeChanged event. The bulk of the implementation, though, resides in the code file (listing 14.5).
NOTE
It can get a little confusing figuring out whether to use Name or x:Name. Determining which is appropriate is largely driven by the namespace containing the element. But, there s a handy trick anything that supports Name also supports x:Name; if you always use x:Name, you ll always be OK.
Listing 14.5 ColumnGraphCtrl implementation
using System; ...bulk of using statements omitted... using System.Collections.ObjectModel; using System.Collections.Specialized; namespace GraphingWithShapes { public partial class ColumnGraphCtrl : UserControl { private ObservableCollection<NameValuePair> dataPoints = null; private List<Color> columnColors = new List<Color>() { Colors.Blue, Colors.Red, Colors.Green }; public ColumnGraphCtrl() { InitializeComponent(); }
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