Part IV in .NET framework

Paint PDF-417 2d barcode in .NET framework Part IV

Part IV
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Working with Windows Applications
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to the Control class. (Buttons have some additional properties that are not part of the Control class; if you specify any of these button-only properties, you cannot set the TargetType to Control.) 7. In the Design View window, click the Reload the designer link. The form should now appear. Notice that the text box is rendered with a gray background. 8. On the Debug menu, click Start Without Debugging to build and run the application. Type some text in the text box, and verify that it appears in white using the Comic Sans MS font. Unfortunately, the choice of colors makes it a little dif cult to see the text caret when you click the text box and type text. You will x this in a following step. 9. Close the form, and return to Visual Studio 2008. 10. In the XAML pane, edit the bellRingersStyle style and add the <Style.Triggers> element shown in bold type in the following code. (If you get an error message that the TriggerCollection is sealed, simply rebuild the solution.)
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<Style x:Key= bellRingersStyle TargetType= Control > <Setter Property= Background Value= Gray /> <Setter Property= Foreground Value= White /> <Setter Property= FontFamily Value= Comic Sans MS /> <Style.Triggers> <Trigger Property= IsMouseOver Value= True > <Setter Property= Background Value= Blue /> </Trigger> </Style.Triggers> </Style>
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A trigger speci es an action to perform when a property value changes. The bellRingersStyle style detects a change in the IsMouseOver property to temporarily modify the background color of the control the mouse is over. Note Don t confuse triggers with events. Triggers respond to transient changes in
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property values. If the value in the triggering property reverts, the triggered action is undone. In the example shown previously, when the IsMouseOver property is no longer true for a control, the Background property is set back to its original value. Events specify an action to perform when a signi cant incident (such as the user clicking a button) occurs in an application; the actions performed by an event are not undone when the incident is nished.
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11. On the Debug menu, click Start Without Debugging to build and run the application again. This time, when you click the text box, it turns blue so that you can see the text caret more easily. The text box reverts to its original gray color when you move the mouse away. Notice that the buttons do not behave in quite the same way. Button controls already implement this functionality and turn a paler shade of blue when you place the mouse over them. This default behavior overrides the trigger speci ed in the style.
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22
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Introducing Windows Presentation Foundation
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12. Close the form, and return to Visual Studio 2008. Note An alternative approach that you can use to apply a font globally to all controls on a form is to set the text properties of the window holding the controls. These properties include FontFamily, FontSize, and FontWeight. However, styles provide additional facilities, such as triggers, and you are not restricted to setting font-related properties. If you specify the text properties for a window and apply a style to controls in the window, the controls style takes precedence over the window s text properties.
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How a WPF Application Runs
A WPF application can contain any number of forms you can add forms to an application by using the Add Window command on the Project menu in Visual Studio 2008. How does an application know which form to display when an application starts If you recall from 1, this is the purpose of the App.xaml le. If you open the App.xaml le for the BellRingers project, you will see that it looks like this:
<Application x:Class= BellRingers.App xmlns= http://schemas.microsoft.com/winfx/2006/xaml/presentation xmlns:x= http://schemas.microsoft.com/winfx/2006/xaml StartupUri= Window1.xaml > <Application.Resources> </Application.Resources> </Application>
When you build a WPF application, the compiler converts this XAML de nition to an Application object. The Application object controls the lifetime of the application and is responsible for creating the initial form that the application displays. You can think of the Application object as providing the Main method for the application. The key property is StartupUri, which speci es the XAML le for the window that the Application object should create. When you build the application, this property is converted to code that creates and opens the speci ed WPF form. If you want to display a different form, you simply need to change the value of the StartupUri property. It is important to realize that the StartupUri property refers to the name of the XAML le and not the class implementing the window in this XAML le. If you rename the class from the default (Window1), the le name does not change (it is still Window1. xaml). Similarly, if you change the name of the le, the name of the window class de ned in this le does not change. It can become confusing if the window class and XAML le have different names, so if you do want to rename things, be consistent and change both the le name and the window class name.
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