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Windows Phone 实用开发技巧(27):创建透明Tile

2012-01-30

I have talked about how to create custom Live Tile in 《Windows Phone 实用开发技巧(17):自定义应用程序的Tile》. Today let’s dig a little bit deeper.What do you see ...

I have talked about how to create custom Live Tile in 《Windows Phone 实用开发技巧(17):自定义应用程序的Tile》. Today let’s dig a little bit deeper.
What do you see in this image shown below ?
image

Do you see the same tile with different background called accent color in windows phone . So how can we create such tile . One simplest way is we replace ApplicationIcon.png with a transparent png file. But as we know it is just main tile of our app. Can we create own tile since we can pin what we want to start ?
Yes, we can do that. All we need to do is to create a transparent png file and save it to Isolated.
Maybe you have already know, we can save jpg file to Iso with following code:
WriteableBitmap bit = new WriteableBitmap();
bit.SaveJpeg(stream, 480, 800, 0, 100);
or
Extensions.SaveJpeg(WriteableBitmap, stream, 480, 800, 0, 100);
But jpg can not be transparent. So we need some extra library to help us create transparent png images. Here I use the famous open souce ImageTools.
We can use two differernt ways to dynamic create images. One way I have post here.
//add encoder for png image
Encoders.AddEncoder<PngEncoder>();

StandardTileData std = new StandardTileData
{
BackgroundImage = new Uri(CreateBackground()),
Title = "Tile Test",
BackTitle = "Secondary",
BackBackgroundImage = new Uri(CreateBackground())
};
ShellTile.Create(new Uri("/MainPage.xaml?type=1", UriKind.Relative), std);
sw.Stop();
Debug.WriteLine("Tranditonal method took time :" + sw.ElapsedMilliseconds);
Here is CreateBackground method looks like:
public static string CreateBackground()
{
Grid grid = new Grid
{
Background = new ImageBrush
{
ImageSource = new BitmapImage
{
UriSource = new Uri("/mangTile;component/Images/1.png", UriKind.Relative),
CreateOptions = BitmapCreateOptions.IgnoreImageCache
}
},
Width = 173,
Height = 173
};
TextBlock tb = new TextBlock
{
Text = "Hello world",
Foreground = new SolidColorBrush(Colors.Red),
FontSize = 32,
};
grid.Children.Add(tb);
grid.Arrange(new Rect(0d, 0d, 173, 173));
WriteableBitmap wbmp = new WriteableBitmap(grid, null);

ExtendedImage extendImage = wbmp.ToImage();

using (var store = IsolatedStorageFile.GetUserStoreForApplication())
{
if (!store.DirectoryExists(tiledirectory))
{
store.CreateDirectory(tiledirectory);
}
using (var stream = store.OpenFile(fullPath, System.IO.FileMode.OpenOrCreate))
{
extendImage.WriteToStream(stream, fullPath);
}
}
return "isostore:/" + fullPath;
}
And as we run it we can see what shown below:

image

Another way is just render it within ImageOpened event:
public static void CreateTile(Uri imageUri, string temperature, string timeOfDay)
{
var source = new BitmapImage(imageUri)
{
CreateOptions = BitmapCreateOptions.IgnoreImageCache,
};

string fullPath = tiledirectory + @"/" + timeOfDay + ".png";

// This is important. The image can&#39;t be rendered before it&#39;s loaded.
source.ImageOpened += (sender, e) =>
{
// Create our image as a control, so it can be rendered to the WriteableBitmap.
var cloudImage = new Image { Source = source, Width = 173, Height = 173 };

// TextBlock for the time of the day.
TextBlock tbTemperature = new TextBlock
{
Text = temperature + &#39;&deg;&#39;,
FontSize = 36,
Foreground = new SolidColorBrush(Colors.White),
FontFamily = new FontFamily("Segoe WP"),
};

using (IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
{
if (!store.DirectoryExists(tiledirectory))
{
store.CreateDirectory(tiledirectory);
}

var bitmap = new WriteableBitmap(173, 173);

// Render our background. Remember the renders are in the same order as XAML,
// so whatever is rendered first, is rendered behind the next element.

// Render our cloud image
bitmap.Render(cloudImage, new TranslateTransform());

// Render the temperature text.
bitmap.Render(tbTemperature, new TranslateTransform()
{
X = 124,
Y = 63
});
bitmap.Invalidate();
ExtendedImage extendImage = bitmap.ToImage();
using (var stream = store.OpenFile(fullPath, System.IO.FileMode.OpenOrCreate))
{
extendImage.WriteToStream(stream, fullPath);
}
StandardTileData std = new StandardTileData
{
BackgroundImage = new Uri("isostore:/" + fullPath),
Title = "Tile Test22",
BackTitle = "Secondary",
BackBackgroundImage = new Uri("isostore:/" + fullPath)
};
ShellTile.Create(new Uri("/MainPage.xaml?type=2", UriKind.Relative), std);
}

};

}
I have a test on it(Conculsion is prefer to use second way as it&rsquo;s faster and more stable! )
Tranditonal took 239 ms, Image size 6.11kb
Render took 10 ms, Image size 5.24kb.
You can find demo source code here. :http://up.2cto.com/2012/0130/20120130031310563.rar



Hope that helps, .

作者:Alexis
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