make barcode with vb.net 19: Windows Presentation Foundation in C#.NET

Printing Code-128 in C#.NET 19: Windows Presentation Foundation

19: Windows Presentation Foundation
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Let s take this animation one step further, and have the animation pause when the user moves the mouse off the square. To do that, you simply need to add another EventTrigger, after the one you just added, to handle a different event:
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<EventTrigger RoutedEvent="Rectangle.MouseLeave"> <PauseStoryboard BeginStoryboardName="BeginRotateStoryboard" /> </EventTrigger>
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Here, you re handling the MouseLeave event, which is raised when the cursor exits the element. Instead of the BeginStoryboard, you re using a PauseStoryboard action here, which halts the execution of the BeginStoryboard in the previous trigger that s why you gave it a name, so you could refer to it here. Run your application again, and you ll see that the animation stops when the mouse leaves the square. If you bring the mouse back inside the square the animation starts again, but the angle starts over from zero. Fixing that would be somewhat more complicated, and beyond the scope of this chapter. Once again, notice that you still haven t written any C# code to accomplish these animations, even with the event triggers. The full XAML file for this example is shown in Example 19-5.
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<Window x:Class="Example_19_5_ _ _ _More_animation.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300"> <Window.Resources> <Storyboard x:Key="Rotate"> <DoubleAnimation Storyboard.TargetName="rectangleRotate" Storyboard.TargetProperty="Angle" From="0.0" To="360.0" Duration="0:0:10" RepeatBehavior="Forever"/> </Storyboard> </Window.Resources> <Grid> <Rectangle Name="myRectangle" Width="100" Height="100" RenderTransformOrigin="0.5,0.5"> <Rectangle.Fill> <SolidColorBrush x:Name="rectangleBrush" Color="Blue" /> </Rectangle.Fill> <Rectangle.RenderTransform> <RotateTransform x:Name="rectangleRotate" Angle="0.0" /> </Rectangle.RenderTransform> <Rectangle.Triggers> <EventTrigger RoutedEvent="Rectangle.Loaded"> <BeginStoryboard> <Storyboard> <ColorAnimation
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Storyboard.TargetName= "rectangleBrush" Storyboard.TargetProperty="Color" From="Blue" To="Red" Duration="0:0:10" AutoReverse="True" RepeatBehavior="Forever" /> </Storyboard> </BeginStoryboard> </EventTrigger> <EventTrigger RoutedEvent="Rectangle.MouseEnter"> <BeginStoryboard Storyboard="{StaticResource Rotate}" x:Name="BeginRotateStoryboard"/> </EventTrigger> <EventTrigger RoutedEvent="Rectangle.MouseLeave"> <PauseStoryboard BeginStoryboardName="BeginRotateStoryboard" /> </EventTrigger> </Rectangle.Triggers> </Rectangle> </Grid> </Window>
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So far, just about everything you ve done with WPF has been declarative; that is, all the functionality has taken place in the XAML file. WPF is specifically designed that way, to be useful to designers as well as to developers. The only C# you ve had to write so far has been some very rudimentary event handlers. In this section you re going to create an example that more closely resembles a production application, and that s going to involve a supporting class, and some event handlers. In this example, you re going to grab the images of the first 20 presidents of the United States from the White House s website, and present them in a custom WPF control, a modified ListBox control. The control will not be wide enough to show all 20 images, so you ll provide a horizontal scroll bar, and as the user moves the mouse over an image, you ll provide feedback by enlarging that image (from 75 to 85) and increasing its opacity from 75% to 100%. As the user moves the mouse off the image, you ll return the image to its smaller, dimmer starting point. This application will use some declarative animation, as you ve already seen, although slightly subtler than the rotating square. In addition, when the user clicks on an image, you ll handle the click and display the name of the president using a C# event handler, and then you ll reach into the control and place the president s name into the title bar of the control.
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19: Windows Presentation Foundation
Figure 19-7 shows the result of scrolling to the 16th president and clicking on the image. Note that the name of the president is displayed in the title bar and that the image of President Lincoln is both larger and brighter than the surrounding images.
Grids and Stack Panels
Create a new WPF application called Presidential Browser. Up until now, you ve placed all your elements in the default Grid control that WPF provides. This time, though, you want two items in the grid the text block that says United States Presidents and the sideways ListBox of photographs, so you can make use of WPF s layout elements. In addition to the grid element, WPF provides a layout object called a stack panel. A stack panel lets you stack a set of objects one on top of (or next to) another set of objects. That turns out to be very useful for laying out your page. If you want a stack that is horizontal and vertical (essentially a table), that s what the grid element is for. A grid has columns and rows, both counting from zero. You ll create a simple grid of two rows and one column, and inside each row you ll place a stack panel. The top stack panel will hold the text, and the bottom stack panel will hold the ListBox that will, in turn, hold the photos. We ll break this down for you and take it one step at a time. To begin, set the width of the Window element to 330 and the height to 230. Next, give the grid some dimensions, by adding properties to the grid element. A width of 300 and a height of 190 should do it. Add the properties like this:
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