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WRITING A CUSTOM CONTENT PANEL
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double xOffset = MaxOffset * (2 * rnd.NextDouble() - 1); double yOffset = MaxOffset * (2 * rnd.NextDouble() - 1); double angle = MaxRotation * (2 * rnd.NextDouble() - 1); TranslateTransform offsetTF = new TranslateTransform(); offsetTF.X = xOffset; offsetTF.Y = yOffset; RotateTransform rotateRT = new RotateTransform(); rotateRT.Angle = angle; rotateRT.CenterX = child.DesiredSize.Width / 2; rotateRT.CenterY = child.DesiredSize.Height / 2; TransformGroup tfg = new TransformGroup(); tfg.Children.Add(offsetTF); tfg.Children.Add(rotateRT); child.RenderTransform = tfg; } The panel is complete. Now we need to do is implement it, that is, use it in the application. We can start to set this up in Blend. So press Ctrl+Shift+B to compile the application and switch over to Blend. Here are the steps to implement the panel:
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1. In Blend open the project. 2. Next, select [UserControl] from the Objects and Timeline panel, and in the Layout bucket
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of the Properties panel, change the Width to 800 and the Height to 600, as shown in Figure 12-5.
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Figure 12-5. Set the Height and Width of the UserControl to 800 600.
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3. Next, click and hold the Button tool on the toolbar, and when it appears select ListBox (see
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Figure 12-6).
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Figure 12-6. Select the ListBox tool.
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4. On the workspace, draw a ListBox that is roughly 200 display units wide and 400 display
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units tall (see Figure 12-7).
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Figure 12-7. Draw a ListBox on the workspace.
Next you are going to add images to your project. I suggest you edit the images so they are roughly 200 200 pixels.
5. Right-click the project and click Add
Existing Item.
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6. Locate the images you would like to use on your hard drive and select them. 7. Your Projects panel should look something the one shown in Figure 12-8.
Figure 12-8. You should now have images in your Project panel.
8. Hold down Ctrl and click each image to select them all. 9. Drag the images onto the ListBox, and Blend should populate your ListBox as shown in
Figure 12-9.
Figure 12-9. The images are now in the ListBox.
You can also verify that the images are in the ListBox by looking at the Objects and Timeline panel (see Figure 12-10).
Figure 12-10. You can see the images are in your ListBox in the Objects and Timeline panel. As you can see in Figure 12-10, this ListBox is not good for our purposes, because we want to take up as little real estate as possible and not have the user have to use the ListBox s scroll functionality. So, it s now time to use our ZStackPanel:
1. Press Ctrl+Shift+B to compile the application and switch back to Visual Studio. 2. Create a UserControl.Resources node in MainWindow.xaml. 3. In this new node add an ItemsPanelTemplate Resource to describe to the ListBox how to
display its items.
4. Inside the ItemsPanelTemplate add the following ZStackPanel (be sure to include the
namespace for the ZStackPanel, which is in bold):
Step 2 can also be done in Blend visually by right-clicking and left-clicking Edit Additional Templates Layout of Items.
<UserControl x:Class="CustomZStackPanelProject.Page" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:CustomZStackPanelProject="clr-namespace: CustomZStackPanelProject"
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Width="800" Height="600"> <UserControl.Resources> <ItemsPanelTemplate x:Key="ZItemsPanelTemplate"> <CustomZStackPanelProject:ZStackPanel MaxOffset="20" MaxRotation="11" /> </ItemsPanelTemplate> </UserControl.Resources>
5. Now, all you need to do is to tell your ListBox to use your new ItemsPanelTemplate named
ZItemsPanelTemplate: <ListBox ItemsPanel="{StaticResource ZItemsPanelTemplate}" Margin="218,66,197,-270"> <Image Height="205" Width="300" Source="Img00.jpg" Stretch="Fill" /> <Image Height="205" Width="300" Source="Img01.jpg" Stretch="Fill" /> <Image Height="205" Width="300" Source="Img02.jpg" Stretch="Fill" /> <Image Height="205" Width="300" Source="Img03.jpg" Stretch="Fill" /> <Image Height="205" Width="300" Source="Img04.jpg" Stretch="Fill" /> </ListBox
In my project, I actually have 15 images. The ZItemsPanelTemplate code has only 5 to save space.
Now, if you press F5 to compile and run the application, you will see that our ListBoxItems all stack on top of each other with a little bit of an (X, Y) offset and at slightly different angles, so we can see that we have more than one image (see Figure 12-11).
Figure 12-11. The ListBoxItems all stack on top of each other with different rotation angles as well as X and Y offsets. At this point, our application is pretty cool, but not very interactive. What we would like to do is move the top item to the bottom of the stack when it s clicked. Let s stop the running application and switch back to Blend to wire this up visually:
1. In Blend, open MainPage.xaml and resize your ListBox so that it is roughly the same size as
your stack of images, as shown in Figure 12-12.
Figure 12-12. Resize your ListBox to be about the same size as the collection of images in it.
2. Draw a Rectangle that completely covers the ListBox, as shown in Figure 12-13.
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Figure 12-13. Draw a Rectangle that completely covers your ListBox.
3. In the Appearance bucket of the Properties panel, set the Opacity of the Rectangle to 0. 4. Now, give the new Rectangle a Name of ImageSelector. 5. Select the ListBox and give it a Name of ZStackLB. 6. Press Ctrl+Shift+B to compile the application and switch back to Visual Studio.
Now, we need to go in to MainPage.xaml.cs and wire up the selection functionality:
1. In MainPage.xaml.cs, raise and handle a MouseLeftButtonDown event for ImageSelector,
as shown in the following code: namespace CustomZStackPanelProject { public partial class Page : UserControl { public Page() { InitializeComponent(); ImageSelector.MouseLeftButtonDown += new MouseButtonEventHandler (ImageSelector_MouseLeftButtonDown); } void ImageSelector_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{ throw new NotImplementedException(); } } }
2. Now, all you need to do is to remove the topmost item and add it back to the collection (this will
put it at the end). Here is the code: void ImageSelector_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { // create a generic object and make it equal to the very first item // in ZStackLB ListBox. object o = ZStackLB.Items.ElementAt(ZStackLB.Items.Count - 1); // Make certain the o actually exists and is not null if (o != null) { // Remove o (the first image in the ZStackLB ListBox ZStackLB.Items.RemoveAt(ZStackLB.Items.Count - 1); // Add o back to the ZStackLB ListBox at the 0 position //(the last item in the ListBox) ZStackLB.Items.Insert(0, o); } } You can see the result when you click an item in Figure 12-14.
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