By Charles Petzold
During this booklet, home windows programming legend Charles Petzold covers in parallel the 2 interfaces that make up the home windows Presentation origin (WPF). From the outset, the reader can shift concentration seamlessly among Extensible software Markup Language (XAML) and C# to work out them as turn aspects of a similar methods. starting within the first bankruptcy, Petzold offers the overall syntax of the XAML and corresponding programming code with various illuminating examples on how the 2 correspond and interrelate. The ebook builds in this base, offering the vintage Petzold home windows person interface (UI) remedy, to teach home windows builders find out how to create next-generation interfaces for his or her purposes.
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Additional info for Applications = Code + Markup: A Guide to the Microsoft Windows Presentation Foundation
The level of gray is simply proportional to the ratio of the two vectors. The OnMouseMove method obtains the Color object associated with the SolidColorBrush originally created as a field of the class, sets the three primaries to the gray level, and then sets the Color property of the brush to this new value. That this program works at all may astonish you. Obviously somebody is redrawing the client area every time the brush changes, but it's all happening behind the scenes. This dynamic response is possible because Brush derives from the Freezable class, which implements an event named Changed.
If the CanFreeze property of a Freezable object is true, it's possible to call the Freeze method to render the object frozen and unchangeable. The IsFrozen property indicates this state by becoming true. Freezing objects can improve performance because they no longer need to be monitored for changes. A frozen Freezable object can also be shared across threads, while an unfrozen Freezable object cannot. Although you cannot unfreeze a frozen object, you can make an unfrozen copy of it. Clone(); If you'd like to see these 141 brushes rendered on the window's client area, the FlipThroughTheBrushes program lets you use the up and down arrow keys to flip through them.
For now, working with a single content object will keep us busy enough. The Window class inherits the Content property from ContentControl, a class that derives from Control and from which Window immediately descends. The ContentControl class exists almost solely to define this Content property and a few related properties and methods. The Content property is defined as type object, which suggests that it can be set to any object, and that's just about true. I say "just about" because you cannot set the Content property to another object of type Window.
Applications = Code + Markup: A Guide to the Microsoft Windows Presentation Foundation by Charles Petzold