force canvas to refresh

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hi,

I have a big wpf canvas (1920*1080) with a small web browser (400*300) in it, i want to copy the browser at full size (1920*1080) and set an image at its place(400*300) instead.

So first i get the previous size of the browser and its position on my screen
then i maximise the browser and set its position to (0,0)
then i copy the screen
then i make the browser disapear and sets a image (400*300 the previous size) to the previous position

I don't want the user to see the user full size , so all is done in the code behind , the problem is that the copy is done on a small browser window

so I tried

UpdateLayout()

with almost no success, it juste moved the browser window but didn't resize it

Posted 14-Aug-13 3:31am

emmanuel Gidon

Updated 14-Aug-13 3:46am

v2

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Sergey Alexandrovich Kryukov 14-Aug-13 9:51am

Canvas itself does not need refresh. How do you do the changes, exactly?
—SA

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emmanuel Gidon · Answer 1 · 2013-08-14T04:09:00

when i load the web browser, i set a 10s timer to launch the function which set to max size, copy and set the image in front

private void webUserControl_Loaded(object sender, RoutedEventArgs e)
{
double widthBefore = Width;
double heightBefore = Height;
double leftPosBefore = Canvas.GetLeft(this);
double topPosBefore = Canvas.GetTop(this);

Timer webContentTimer = new Timer();
webContentTimer.AutoReset = false;
webContentTimer.Interval = 10000;
webContentTimer.Elapsed += (oo, ee) => {
DispatcherOperation dispatcherOp = Dispatcher.BeginInvoke(
DispatcherPriority.ApplicationIdle, new Action(delegate()
{
Canvas.SetLeft(this, 0);
Canvas.SetTop(this, 0);
containerWeb.setFreshMeasure(screenWidth_, screenHeight_);
Width = screenWidth_;
Height = screenHeight_;
UpdateLayout();}));

dispatcherOp.Completed += new EventHandler((ooo,eee) => {
containerWeb.setImageInFront(true);

Canvas.SetLeft(this, leftPosBefore);
Canvas.SetTop(this, topPosBefore);
containerWeb.setFreshMeasure(widthBefore, heightBefore);
Width = widthBefore;
Height = heightBefore;
webContentTimer.Stop();});
};

webContentTimer.Start();
}

emmanuel Gidon · Answer 2 · 2013-08-14T05:11:00

Solution 2

in fact to make it work, there is an ugly one that i'd like to avoid. It is to set 2 events :

the first one happens 10000 millisecond after the loading and maximises the browser

then one waits 40 milliseconds for the second event which copies the screen and sets the small image

it's ugly

Posted 14-Aug-13 5:11am