By Charles Petzold
During this e-book, home windows programming legend Charles Petzold covers in parallel the 2 interfaces that make up the home windows Presentation starting place (WPF). From the outset, the reader can shift concentration seamlessly among Extensible program Markup Language (XAML) and C# to work out them as turn aspects of an identical methods. starting within the first bankruptcy, Petzold provides the final syntax of the XAML and corresponding programming code with a variety of illuminating examples on how the 2 correspond and interrelate. The publication builds in this base, delivering the vintage Petzold home windows person interface (UI) remedy, to teach home windows builders tips to create next-generation interfaces for his or her purposes.
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Extra info for Applications = Code + Markup: A Guide to the Microsoft Windows Presentation Foundation
In the latter group, the object is displayed with ToString; in the former group, it's displayed with OnRender. Classes that derive from UIElement (and their instantiated objects) are often referred to collectively as elements. The only class that inherits directly from UIElement is FrameworkElement, and all the elements you'll encounter in the Windows Presentation Foundation derive from FrameworkElement. In theory, UIElement Part I: Code 53 54 Part I: Code provides the necessary structure of user interface events and screen rendering that can support various programming frameworks.
It may seem like magic, but it's not. There's always some method of notification in the form of an event. Being aware of what's going on (or not going on) can help you better understand the environment. The revised RecordKeystrokes program with the StringBuilder object won't even work if you insert the following statement Content = build; at the bottom of the OnTextInput override. The window is smart enough to know that you're assigning the same object to Content that you've already set to Content, so no update is necessary.
The Image object also has Width and Height properties that it inherits from FrameworkElement. These are read/write double values, and if you check their values, you'll see that they are undefined, which is indicated by values of "not a number," or NaN. ) You can also set a precise Width and Height of the Image object, although these may not be consistent with some Stretch settings. WidthAndHeight; Setting the Foreground property of the Window object has no effect on the display of the image; the Foreground property only comes into play when the window content is text or (as we'll see) another type of element that displays text.