vb.net barcode generator open source Setting the Tab Order in Visual C#

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Setting the Tab Order
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There is no visual overlay for setting the tab order of WPF controls. By default, the tab order is determined by the order in which controls appear in the XAML for your program, so one approach is to rearrange the XAML elements to get the effect you require. This is fine for simple programs but quickly becomes a problem with complex projects. We can achieve a better effect by setting the values of the TabIndex and IsTabStop properties. Tab order is determined by the ascending order of the TabIndex property and controls whose IsTabStop property is set to false and won t be included in the tab order at all. For our simple program, I want the Tab key to move from the minutesTextBox to the lapsTextBox to the convertButton controls and to exclude all other controls. Table 33-1 shows the properties that have to be set for this to happen.
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CHAPTER 33 WINDOWS PRESENTATION FOUNDATION
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Table 33-1. Property Changes for Tab Ordering
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minutesTextBox lapsTextBox lengthTextBox caloriesTextBox convertButton
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TabIndex TabIndex IsTabStop IsTabStop TabIndex
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1 2 False False 3
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In addition, select the MenuItem control at the top of the design surface, and uncheck the IsTabStop property. If you compile and run the program now, you will see that the Tab key cycles between the top two TextBox controls and the Button.
Wiring the Controls
The process for wiring up WPF controls is similar to the approach we saw in the previous chapter. You select a control, switch to the Events view in the Properties window, and then double-click to create a handler for the event you want to process.
Tip WPF commands offer an alternative way of wiring controls; see the Using WPF Commands section later in this chapter.
Wiring the Quit Menu
To select the Quit MenuItem, right-click the Menu control on the design surface, and select Document Outline from the pop-up menu. A new window will open, which will show you the hierarchy of controls in the program. You can see that the Menu control has a single MenuItem, which in turn contains a single MenuItem. If you roll your mouse over the items in the Document Outline view, you will see that a picture of the control pops up, as shown in Figure 33-12. The Document View is very useful for finding and selecting controls. Select the Quit menu item, switch to the Event view in the Properties window, and double-click the Click event. The view will switch to the code-behind file, and a handler for the event will be added. Exiting a WPF program is done through the System.Windows.Application class, which has a static property called Current. We read the value of this property to get an Application object that represents this program, and we call the Shutdown method to exit. Listing 33-1 shows the event handler method. I have removed the using statements that were added automatically but that are unused in our program.
CHAPTER 33 WINDOWS PRESENTATION FOUNDATION
Figure 33-12. Using the Document Outline view Listing 33-1. Adding a Handler to Exit the Program using System.Windows; namespace SwimCalculator { public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private void MenuItem Click(object sender, RoutedEventArgs e) { Application.Current.Shutdown(); } } } If you compile and run the program and select the Quit menu item, the program will exit.
Wiring the TextBox Controls
We want to filter the key presses that the TextBox controls receive to ensure that they contain only numeric values. We need to do this for all four TextBox controls, because we can t rely on the implied filtering that comes with a NumericUpDown control. Listing 33-2 shows the method I have added to the MainWindow.xaml.cs code-behind file that we will use to process key presses. This is very similar to the code that we used for the Windows Forms example. Listing 33-2. The ValidateKeyPress Method private void ValidateKeyPress(object sender, KeyEventArgs e) { // define the keys we want
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