Metro App OnSearchActivated ProgressRing not displaying - windows-runtime

I am implementing searching within my Metro application. The search works well, results and UI come up as expected with one problem though.
I try to display a ProgressRing before the search and hide it after the search completes, but it never gets displayed.
What am I missing, code snippet below:
protected override void OnSearchActivated(Windows.ApplicationModel.Activation.SearchActivatedEventArgs args)
{
// Some Metro designer generated code here
// Show progress ring
MainPage.Current.ResetProgressRingState(true);
// Bind search results
MainPage.Current.BindSearchResults(args.QueryText);
// Ensure the current window is active
Window.Current.Activate();
// Hide progress ring
MainPage.Current.ResetProgressRingState(false);
}
I suspect that the BindSearchResults method needs to be awaited in order for the ProgressRing to work correctly. If so, what's the easiest way to make that method awaitable, if not please advise what I am missing here.

If so, what's the easiest way to make that method awaitable, if not please advise what I am missing here.
Mark it as async and have it return Task. Within that method, use await on other asynchronous operations.

Related

Swing JTabbedPane : addChangeListener or addContainerListener or both?

I have one swing code written by other person. For swing tabbed pane, he has added both change and container listener and both calls the same method:
addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent theEvent ) {
someMethod();
}
} );
addContainerListener(new ContainerAdapter() {
public void componentAdded(ContainerEvent theEvent) {
someMethod();
}
public void componentRemoved(ContainerEvent theEvent) {
someMethod();
}
} );
Whenever tab is removed from this tabbed pane, it internally calls JTabbedPane.removeTabAt(int index), which in turn calls fireStateChanged() causing new change event listened by change listener.
Now as new component (tab) is removed from tabbed pane, it also calls componentRemoved(ContainerEvent theEvent) method of container listener.
Both change even and container events, then calls same method someMethod(), which does set background and foreground colors.
I would like to know, if this kind code might cause some issues. Recently we are facing random IndexOutOfBoundException exeptions. I am just wondering, if this is causing this issue.
Also as per my understanding in swing, once event is listened, logic inside it should be executed using worker thread (e.g. SwingWorker). Please let me know if this is correct.
I am new to swing, thus any hint would be appreciated.
Thanks.
Whenever tab is removed from this tabbed pane, it internally calls
JTabbedPane.removeTabAt(int index), which in turn calls
fireStateChanged() causing new change event listened by change
listener.
This is true if the removed tab is also the selected tab. In the other cases, you won't be notified.
You need to choose what event you want to listen to:
Addition/Removal of components?--> go for ContainerListener
Selected tab? --> go for ChangeListener
I would like to know, if this kind code might cause some issues.
Recently we are facing random IndexOutOfBoundException exeptions. I am
just wondering, if this is causing this issue.
Since there is no line in your sample code that could throw that Exception, it is impossible to answer your question. Post an SSCCE that shows your issue.
Also as per my understanding in swing, once event is listened, logic
inside it should be executed using worker thread (e.g. SwingWorker).
Please let me know if this is correct.
It depends:
If you need to modify anything in the UI, anything related to Swing, it needs to be executed on the EDT (Event Dispatching Thread) and thus, SwingWorker is not an option.
If you need to perform business logic operations, and especially if they can be lengthy, then you should indeed use a SwingWorker or any other mechanism to execute that code in another thread than the EDT. Consider visiting the Swing tag wiki on "Concurrency"

Allow only one uiviewcontroller to rotate

I'm working on an app using IIViewDeck and I only want one view controller to rotate. It's ios 6 and I was able to work out the shouldRotate cascading to get the one that I need to rotate successfully.
My problem is that if I'm in landscape then switch to another view controller, the app remains in landscape. I need to force it back to protestor but I haven't had any success. I thought the simplest approach would be to do some 'force portait' code in the rotatable view controller's viewWillDisapper but I just don't know how to enforce.
Any suggestions?
Your question is also asked here
In all your VC's say yes to rotation, but use an NSUInterger to set the mode like so:
The answer that questions has is below:
-(BOOL)shouldAutorotate
{
return YES;
}
//keep the below code in all your VC's that you do not want to have the rotation capability
-(NSUInteger)supportedInterfaceOrientations
{
return UIInterfaceOrientationPortrait;
}

How to extend a native mootools method

Is it possible to extend the addEvent function in mootools to do something and also calls the normal addEvent method? Or if someone has a better way to do what I need I'm all years.
I have different 'click' handlers depending on which page I'm on the site. Also, there might be more than one on each page. I want to have every click on the page execute a piece of code, besides doing whatever that click listener will do. Adding that two lines on each of the handlers, would be a PITA to say the least, so I thought about overriding the addEvent that every time I add a 'click' listener it will create a new function executing the code and then calling the function.
Any idea how I could do it?
Whereas this is not impossible, it's a questionable practice--changing mootools internal apis. Unless you are well versed with mootools and follow dev direction on github and know your change won't break future compatibility, I would recommend against it.
The way I see it, you have two routes:
make a new Element method via implement that does your logic. eg: Element.addMyEvent that does your thing, then calls the normal element.addEvent after. this is preferable and has no real adverse effects (see above)
change the prototype directly. means you don't get to refactor any code and it will just work. this can mean others that get to work with your code will have difficulties following it as well as difficulties tracing/troubleshooting- think, somebody who knows mootools and the standard addEvent behaviour won't even think to check the prototypes if they get problems.
mootools 2.0 coming will likely INVALIDATE method 2 above if mootools moves away from Element.prototype modification in favour of a wrapper (for compatibility with other frameworks). Go back to method 1 :)
I think solution 1 is better and obvious.
as for 2: http://jsfiddle.net/dimitar/aTukP/
(function() {
// setup a proxy via the Element prototype.
var oldProto = Element.prototype.addEvent;
// you really need [Element, Document, Window] but this is fine.
Element.prototype.addEvent = function(type, fn, internal){
console.log("added " + type, this); // add new logic here. 'this' == element.
oldProto.apply(this, arguments);
};
})();
document.id("foo").addEvent("click", function(e) {
e.stop();
console.log("clicked");
console.log(e);
});
it is that simple. keep in mind Element.events also should go to document and window. also, this won't change the Events class mixin, for that you need to refactor Events.addEvent instead.

Force immediate layout and paint in Swing

I cannot seem to force a layout in Swing. I have a JComponent added to a JLayeredPane and I set a border on the JComponent. Then, I want to immediately re-draw everything - not in the sense of "please do this asap" like invalidate(), but synchronously and immediately. Any help? I cannot seem to find the right method of doing this, and all my reading about invalidate(), validate(), repaint(), doLayout(), etc is just confusing me more!
According to this (see the section titled "Synchronous Painting") the paintImmediately() method should work.
The most reliable way to get Swing to update a display is to use SwingUtilities.invokeLater. In your case, it would look something like
SwingUtilities.invokeLater(new Runnable {
public void run() {
somecomponent.repaint();
}
});
I realize the 'invokelater' does not exactly sound like it does anything immediate, but in practice, events posted in this way tend execute pretty quickly compared to just calling e.g. somecomponent.repaint() directly. If you absolutely must make your control code wait for the GUI to update, then there is also invokeAndWait, but my experience is that this is rarely necessary.
See also: document on event dispatch in Swing.
This is super old, but I found a simple solution, which I'll show with a JPasswordField:
var pw = new JPasswordField();
...
pw.paint(pw.getGraphics()); // paints immediately

How to submit HTML and receive a bitmap?

I have an app that allows a user to use JQuery and Javascript to add images and position them in a div dynamically.
I would like to be able to submit the div with all the HTML to a WebService and receive back an image so we have a bitmap of the result of the end user's work.
I would prefer a solution in .Net as this is what I am most familiar with but am open to pretty much anything?
I would like to be able to submit the div with all the HTML to a WebService and receive back an image
Try http://browsershots.org!
Browsershots makes screenshots of your web design in different operating systems and browsers. It is a free open-source online web application providing developers a convenient way to test their website's browser compatibility in one place.
How about this. You load the html into a webbrowser control and then use the DrawToBitmap method. It doesn't show up on intellisense and this is probably not the best solution, but it works. Observe the DocumentCompleted event and add the following code:
private void webBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
var bmp = new Bitmap(100, 100);
var rect = new Rectangle(webBrowser.Location.X, webBrowser.Location.Y, webBrowser.Width, webBrowser.Height);
webBrowser.DrawToBitmap(bmp, rect);
bmp.Save("test.jpg", ImageFormat.Jpeg);
}
You'll probably want to change the width and height of that bitmap object (do it in some smart way or something). Hope this helps.
EDIT: I see now that you are using a webservice for this, hence this solution probably won't work. I'll leave it here just for information's sake.
I was not able to figure out how to do this by submitting the html and receiving an image but I was able to create and ASHX handler that returns a png file based on this blog post
which was good enough for my scenario.
He uses CutyCapt to take a screen shot of an existing web page, write the image to a folder on the webserver and return it.