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Exploring mouse events


Silverlight 5 Essential Training

with Walt Ritscher

Video: Exploring mouse events

There are a handful of mouse-specific events available for Silverlight Elements. These events are tailored to the mouse and they send mouse-exclusive details to your code via the MouseEventArgs parameter. I'm going to show you these events in the DetailingMouseEvents project. I'll start by looking at MouseEvents.xaml. There are three ellipses on this page. This first ellipse uses the MouseEnter and MouseLeave event. Here they are. The second ellipse uses the MouseWheel event. And the third event of course is going to use MouseMove.
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  1. 1m 41s
    1. Welcome
    2. Using the exercise files
  2. 35m 1s
    1. Overview of Silverlight
      3m 29s
    2. Setting up a developer computer
      2m 46s
    3. Installing the Silverlight Toolkit
      2m 21s
    4. Exploring the toolkit samples
      2m 35s
    5. Using Visual Studio 2010 to create a Silverlight project
      5m 10s
    6. Using Expression Blend to create a Silverlight project
      3m 13s
    7. Getting to know the Visual Studio interface
      8m 16s
    8. Working in the Expression Blend interface
      7m 11s
  3. 29m 47s
    1. Understanding the Visual Studio project structure
      3m 38s
    2. Creating a Silverlight page
      3m 17s
    3. Compiling your first application
      5m 1s
    4. Using other assemblies in an application
      5m 45s
    5. Deploying a Silverlight application
      3m 43s
    6. Understanding the startup process for an application
      3m 13s
    7. Understanding how users get Silverlight on their computers
      5m 10s
  4. 16m 59s
    1. Exploring the relationship between XAML and .NET
      3m 57s
    2. Using C#
      7m 16s
    3. Exploring the code-behind file
      5m 46s
  5. 43m 23s
    1. Working with XAML elements and Property attributes
      4m 56s
    2. Investigating XAML namespaces
      7m 32s
    3. Converting XAML properties with TypeConverters
      5m 1s
    4. Working with Property elements
      4m 24s
    5. Assigning runtime data with XAML markup extensions
      4m 21s
    6. Digging into the dependency property system
      6m 12s
    7. Creating a custom dependency property
      4m 42s
    8. Understanding attached properties
      6m 15s
  6. 9m 35s
    1. Debugging your code
      5m 17s
    2. Special Silverlight debugging techniques
      4m 18s
  7. 36m 1s
    1. Understanding layout
      4m 55s
    2. Using DockPanel and WrapPanel
      4m 2s
    3. Exploring sophisticated layouts with the Grid
      6m 40s
    4. Absolute positioning with the Canvas panel
      5m 20s
    5. Scrolling content with the ScrollViewer
      3m 28s
    6. Adjusting content alignment, margins, and sizing
      5m 6s
    7. Using the TabControl
      2m 17s
    8. Manipulating elements with transforms
      4m 13s
  8. 20m 33s
    1. Painting the user interface (UI) with SolidColorBrush
      6m 7s
    2. Getting colorful with gradient brushes
      3m 15s
    3. Decorating elements with ImageBrush
      4m 57s
    4. Creating effects with VideoBrush
      6m 14s
  9. 25m 42s
    1. Understanding routed events
      3m 12s
    2. Wiring up event handlers in Silverlight
      6m 4s
    3. Understanding event bubbling
      4m 39s
    4. Exploring mouse events
      7m 43s
    5. Exploring keyboard events
      4m 4s
  10. 32m 31s
    1. Displaying text on the screen
      3m 24s
    2. Gathering text input from the user
      5m 30s
    3. Showing complex text with RichTextBox
      6m 7s
    4. Understanding text overflow and text linking
      3m 14s
    5. Searching content with the AutoComplete type-ahead control
      6m 45s
    6. Using and embedding Silverlight fonts
      7m 31s
  11. 26m 48s
    1. Understanding content controls
      5m 7s
    2. Understanding button controls
      6m 17s
    3. Using the BusyIndicator
      4m 40s
    4. Showing tooltips
      4m 34s
    5. Changing content size with ViewBox
      1m 39s
    6. Exploring more controls
      4m 31s
  12. 55m 36s
    1. Connecting elements with binding
      9m 54s
    2. Using business data in a binding
      9m 21s
    3. Listing data with ItemsControls
      6m 39s
    4. Digging into the DataGrid
      8m 28s
    5. Using the DataForm
      3m 49s
    6. Storing data on the client
      7m 10s
    7. Debugging XAML bindings
      5m 41s
    8. Charting data
      4m 34s
  13. 24m 36s
    1. Creating an Out-of-Browser (OOB) application
      6m 16s
    2. Controlling aspects of an OOB application
      2m 49s
    3. Alerting the user with notification windows
      7m 13s
    4. Hosting HTML content in Silverlight applications
      8m 18s
  14. 30m 2s
    1. Exploring Silverlight trust levels
      3m 51s
    2. Creating an elevated trust application
      5m 57s
    3. Reaping the benefits of XAP signing
      6m 5s
    4. Making cross-domain calls
      5m 1s
    5. Getting started with COM Interop using the Speech API
      4m 21s
    6. Using COM Interop to interact with Microsoft Office
      4m 47s
  15. 16m 34s
    1. Showing child windows
      3m 48s
    2. Using a child window as a dialog window
      5m 7s
    3. Creating native windows
      2m 53s
    4. Maximizing a window with full screen mode
      4m 46s
  16. 13m 20s
    1. Dynamically loading UI content with user controls
      4m 46s
    2. Using the Navigation Framework
      8m 34s
  17. 9m 28s
    1. Using resource files
      3m 53s
    2. Using images in an application
      5m 35s
  18. 16m 32s
    1. Playing audio
      4m 27s
    2. Playing sound effects
      5m 4s
    3. Viewing video content with MediaElement
      4m 58s
    4. Changing video playback speed with TrickPlay
      2m 3s
  19. 14m 41s
    1. Capturing video with a web camera
      4m 16s
    2. Working with a microphone
      3m 47s
    3. Creating print output
      6m 38s
  20. 22m 35s
    1. Understanding Silverlight animations
      4m 35s
    2. Creating animations
      7m 52s
    3. Controlling animations
      4m 18s
    4. Simulating physics with animation easings
      5m 50s
  21. 27m 47s
    1. Placing XAML resources within a FrameworkElement
      6m 47s
    2. Centralizing settings in styles
      4m 8s
    3. Creating an alternate control UI with ControlTemplates
      6m 29s
    4. Dressing up your data with DataTemplates
      4m 33s
    5. Explaining the VisualStateManager: a simple way to manage control states
      5m 50s
  22. 10m 56s
    1. Handling global errors in a Silverlight application
      5m 46s
    2. Showing an application loading screen
      5m 10s
  23. 10m 48s
    1. Integrating with XNA
      7m 40s
    2. Exploring data analysis with PivotViewer
      3m 8s
  24. 1m 6s
    1. Goodbye
      1m 6s

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Watch the Online Video Course Silverlight 5 Essential Training
8h 51m Beginner Mar 27, 2012

Viewers: in countries Watching now:

Microsoft Silverlight 5 is a rich application framework for creating high-performance, cross-platform desktop and mobile applications. In this course, author Walt Ritscher demonstrates how to build a variety of applications in Silverlight, with particular focus on building compelling business applications and delivering premium video and audio content. Developers will work with the C# programming language and Visual Studio Professional, as well as Expression Blend, a tool that simplifies creation of the interactive user interfaces expected in modern-day applications.

Topics include:
  • Installing the toolkit and setting up the development environment
  • Using Expression Blend vs. Visual Studio 2010
  • Creating a Silverlight page
  • Compiling an application
  • Exploring the relationship between XAML and .NET
  • Using C#
  • Working with XAML
  • Digging into the Dependency Property System
  • Deploying and debugging code
  • Creating sophisticated layouts with panel elements
  • Managing Visual State with Visual State Manager
  • Transforming the user interface (UI) with templates
  • Understanding the event model
  • Working with text
  • Using business data in a binding
  • Creating an out-of-browser (OOB) application
  • Exploring trust levels
  • Playing audio and video
  • Handling errors
  • Exploring animations
  • Working with application windows
  • Integration with XNA
Silverlight Visual Studio
Walt Ritscher

Exploring mouse events

There are a handful of mouse-specific events available for Silverlight Elements. These events are tailored to the mouse and they send mouse-exclusive details to your code via the MouseEventArgs parameter. I'm going to show you these events in the DetailingMouseEvents project. I'll start by looking at MouseEvents.xaml. There are three ellipses on this page. This first ellipse uses the MouseEnter and MouseLeave event. Here they are. The second ellipse uses the MouseWheel event. And the third event of course is going to use MouseMove.

Let's go look at the code for these. Press F7 to switch to the code behind. Here's my code for the MouseEnter. When the mouse enters the ellipse, I'm going to generate a solid color brush and assign it to the Fill property of the sender, in this case the ellipse that raised the event. When the MouseLeave event fires, I set the Fill Color to White. In the wheel event, I'm getting mouse-specific information. That's coming in via this MouseWheelEventArgs, through this variable, e. So when I go down into my code, I can say e.Delta and that gives me information about whether the user was using a positive or negative scroll on their mouse wheel.

So I'm changing the width of my ellipse based on which way you roll the mouse. The MouseMove event procedure code is up here. I'm using a little bit of code to get the position of the mouse. Again, I'm using MouseEventArgs and I'm using the e.GetPosition. Now, I have to get to a position relative to something, so I'm getting it relative to the UserControl. So this says go figure out where the mouse is, get its position, store it in this point variable. Now that you have the point variable, get the X coordinate and the Y coordinate and store them in the string, and then send that string to the textBlockResults.

Press F5 to run the application. Here's the MouseEnter and the MouseLeave. Here's the Mouse Wheel, I'll hover my mouse over this and then use my Mouse Wheel. And then over here, as I move my mouse around, you can see my coordinates. There are two sets of coordinates. One is relative to the root element, which is the UserControl and the other one is relative to the moveEllipse itself. The rectangles on the bottom of the page are used to demonstrate mouse cursors. Now, these aren't events but they are affiliated with the mouse and I think it's interesting.

Let me show you what I mean. If I click on this rectangle and scroll down here, I have this cursor property and I've set that to one of the available Silverlight cursors. So when I press F5 and run the application, you can hover your mouse over these different rectangles to see examples of different cursors. Next, I'd like to talk about the drag events that are available in Silverlight. Dragging items on a computer screen with our mouse is second nature to most of us. It's an easy metaphor to learn and mouse- dragging has been around for decades. Silverlight has drag support and it's what I want to explore.

There are two types of drag scenarios that are employed in modern applications. There is the internal model, where you drag within the boundaries of your application. For example, you might drag a product from a product list to a shopping cart. The other model is dragging between applications. The classic example for this model is dragging from a file explorer window into an application window. In this demo, I'll show file drag and drop. To enable applications to support drag and drop, Silverlight has four events: DragEnter, DragLeave, DragOver, and Drop.

These are available on the UIElement class. Consequently, any visual element can be a drop target. To demonstrate this I'm going to open this DragToListbox file, and as you can see I have a listbox here, and then it has a number of event procedures. It has one for Drop. This fires when you drop something on the listbox and it has one for DragEnter and one for DragLeave. I'm going to use this to signal to the user that it's okay to drop on this target.

And then of course I need to enable dropping by saying AllowDrop='True'. Now let's look at the code behind. Here is the code for the DragEnter. When the mouse enters a listbox, I'm going to set my listBox.Background to a Yellow brush and I'm going to change the thickness of my border to a thicker look. When you drag leave, I'll set them back to their original settings. And of course I'm going to do a drop. That code up here is inside the listBox_Drop.

This checks this e object, DragEventArgs to see if I'm actually dragging anything useful. If I am, then I run this code. I create an array of FileInfo objects by calling e.Data.GetData and I tell it the kind of data I'm looking for, a FileDrop. Once I have this array, I can use that as a binding source for my listbox. I discuss binding later. And then I tell it which property on this FileInfo to display.

I'll show you what it looks like. Press F5, click on this Drag to listbox. Now I'm going to go to my hard drive and find some files. I'm in my Assets folder, which is part of the Exercise Files. Of course you can use your own files on your own computer. I'm going to pick this grapes.png file, I'm going to drag it over, and as it enters the listbox, you'll see the DragEnter event fire. It changes the color to yellow and changes the border. When I move my mouse out of the listbox, the DragLeave event fires.

This is supposed to provide a clue to the user that you are in an area where they can drag and drop an item. Now, when I drop this, I'll do the binding. Notice when I drag one file, I get one string. If I drag multiple files, that's the array of FileInfo. I can make this more interesting by dragging an image over and picking the bitmap bits out of it and drawing images instead of strings. That's what the Image Viewer shows. This is an area where I'm going to drag my items.

I'll pick this grapes file up and drop it and now you see I get a more visual approach. I like that. I'll pick this up and drag it around. This is creating an image, reading the bitmap data out of it, applying a border, skewing it, rotating it, and it's also applying a pixel shader, a drop shadow effect to it. Let me show you that code briefly. And it's over here in the ImageViewer.xaml.cs. There's a lot of code in here.

I'll scroll down slowly and then you can stop the video and copy it all into your applications. Essentially, I have a timer that's firing, checking my drop target. And when it detects there's an item in there, then it runs this bit of code, which takes the file information; grabs the bitmap information, in this case, it's creating a new bitmap image; getting the information out of the file stream; setting the image properties. Here I've created an Image control, setting the properties like the Width and the Visibility, adding some drag behavior; rotating it using the transforms, setting some colors on the background, and here this is DropShadow.

Finally, the last thing I do is I take that image and I add it to my LayoutRoot.Children collection. Now you've seen more about drag and drop support. In a few lines of code I was able to drag and drop from the operating system to the Silverlight app. I have no doubt that Silverlight features like this will make developers happy and productive people.

Find answers to the most frequently asked questions about Silverlight 5 Essential Training .

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Q: I'm trying to access a Silverlight 3D application template, [cid:image001.png@01CD0E7D.3E07ECA0]. I have already installed the Silverlight 5 SDK and my Visual Studio 2010 is professional. Could you please help me?
A: You must install XNA Studio in order to use the new Silverlight 3D templates. Otherwise the new templates will not show up. Download it at

For other Silverlight downloads (the toolkit, developer runtime, etc.), see
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