Practical development tips for Windows Phone (41): Solve the Problem of black background web page flashing in WebBrowser

In Windows Phone, We need to display HTML content. The preferred solution is WebBrowser. However, there are often various problems in WebBrowser: Garbled code, pop-up screen, and so on.

 

The Default background color of WebBrowser is white. To change the background color of WebBrowser to black, add the css code to HTML.

Body {

Background-color: black;

Color: white;

}

However, a problem arises as a result of abrupt changes from the white background to the black background, resulting in a flickering screen. The purpose of this article is to solve this problem. If you have a better solution, please share it with me.

 

Solution 1: gradient Animation

We use a gradient animation to gradually display WebBrowser.

Private void FadingIn ()
{
Storyboard storyboard = new Storyboard ();

DoubleAnimation animation = new DoubleAnimation ();
Animation. Duration = (Duration) TimeSpan. FromSeconds (0.5 );
Animation. BeginTime = TimeSpan. FromSeconds (0.2 );
Animation. From = 0.2;
Animation. To = 1.0;
Storyboard. SetTargetProperty (animation, new PropertyPath ("Opacity", new object [0]);
Storyboard. SetTarget (animation, webBrowser );

Storyboard. Children. Add (animation );
Storyboard. Begin ();
}
After setting the Source of webBrowser or calling the Navigate method of webBrowser, you can call FadingIn.

The effect is also good, mainly because there is a gradient animation in the content of WebBrowser. I used this method in viewing the large image in the Windows Phone FAQ encyclopedia App. (Displaying images with WebBrowser is a very lazy solution)

 

Solution 2. Set transparency

From the inspiration of the gradient animation above, we can set the Opacity of WebBrowser to 0 at the beginning, and then restore the winning Opacity of the LoadCompleted event to 1.0. The results are very good.