ExImage is a Silverlight control very similar to the built-in
Image control, except it supports three more stretch modes:
RepeatXY. Which means an image can be tiled in horizontal direction, or vertical direction, or both.
Image repeat in x direction. The red part is the background.
Image repeat in y direction. The red part is the background.
Image repeat in both x and y directions.
In HTML, image background supports repeat x, repeat y, and repeat in both directions. But in Silverlight, the
Image control only supports
UniformFill stretch modes. And, you can't easily tile an image in x/y direction. So, I create the
ExImage control to emulate the HTML background image behaviors and lets you easily use it.
Using the Code
It's very similar to the intrinsic
Image control both in beahvor and in using the methods. First of all, you should add a reference to the
Cokkiy.ExImage assembly to your Silverlight project.
Then, in your page's XAML file, you put it just like an
Image control and set its
<cokkiy:ExImage x:Name="myImage" Source="s.jpg"
Stretch="RepeatX" Background="#FFDA2525" Width="400" Height="300"/>
How it Works
We all know that, in Silverlight, the only way to display an image is using the
Image control, and there are no methods or functions to directly manipulate the image. So clearly, the only way to tile an image is using many
Image controls and tiling them on the destination rectangle. And the end result will be just like tiling the image.
Now, let's look at how the
RepeatX mode is implemented.
int count = (int)Math.Ceiling(Container.ActualWidth / imgWidth);
double totalUsedWidth = 0.0; double height = Math.Min(imgHeight, Container.ActualHeight);
for (int i = 0; i < count; i++)
double remain = Container.ActualWidth - totalUsedWidth;
Image img = new Image();
img.Stretch = System.Windows.Media.Stretch.None;
img.Width = remain >= imgWidth ? imgWidth : remain;
img.Height = height;
img.Source = Source;
Canvas.SetLeft(img, imgWidth * i);
totalUsedWidth += imgWidth;
In the code, we first calculate the
count, how many
Image controls should be put in the x direction. Then, we create as many
Image controls and set their left positions. We then save them to a list.
In the end, we add the
Images that have been saved in the list to the
Conatiner, which is a
foreach (var item in imagesList)
In the previous code,
imgHeight means the real width and height of the image, which can be obtained from the
BitmapSource object. The
BitmapSource class has two properties,
PixelWidth, which represent the width and height of the image. But those properties only have a value when the image is loaded, so you need to handle the
ImageOpened event to retrieve those values.
private void CalcImageSize(ImageSource imageSource)
if (imageSource != null)
Image img = new Image();
img.ImageOpened += new EventHandler<RoutedEventArgs>(img_ImageOpened);
img.Source = imageSource;
void img_ImageOpened(object sender, RoutedEventArgs e)
Image img = sender as Image;
imgHeight = (img.Source as BitmapSource).PixelHeight;
imgWidth = (img.Source as BitmapSource).PixelWidth;
Container.Children.Remove(img); img = null;
For more information about how to get the image's dimensions, you may read this Silverlight Tip of the Day #13 - How to Get an Image's Dimensions in Silverlight and these http://forums.silverlight.net/forums/t/14637.aspx articles.
- 24 Jan 2010: Initial post.
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