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http://textpattern.com/?v=4.0.8 CreaBros Oy - Random http://www.creabros.fi/ Helping With Computer Stuff Sat, 13 Apr 2013 11:09:13 GMT JBot wars I spirit of CRobots I decided to do a little javascript robot combat arena. Enjoy the JBot wars

All the code is in the index.html, but I also uploaded it to github

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http://www.creabros.fi/index.php?id=78 Thu, 28 Mar 2013 20:06:08 GMT Kalle Kuismanen tag:www.creabros.fi,2013-03-28:26a712242462e138d6e14fdd1c6b9152/0f87b724ab86e3a1a0ef99bb14b16997
Stackoverflow answers / we salute you Best things are done by people for people just because. One of the best examples of this is the http://stackoverflow.com questions.

I’ve been stuck many times and found salvation from this website! I salute you all.

I decided that I should also make a contribution so here it is…

How to make dialogs in phonegap

Here is my solution

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http://www.creabros.fi/index.php?id=75 Fri, 16 Nov 2012 02:38:36 GMT Kalle Kuismanen tag:www.creabros.fi,2012-11-15:26a712242462e138d6e14fdd1c6b9152/a5a4643c18f6931d83f5264e55883a12
How do people find this page Statistics are fun. Here are search terms that have been used recently to find this page. I guess I should publish something more than the stopwatch.

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http://www.creabros.fi/index.php?id=74 Wed, 24 Oct 2012 11:24:38 GMT Kalle Kuismanen tag:www.creabros.fi,2012-10-24:26a712242462e138d6e14fdd1c6b9152/7804db69e4ed36b71c2cdc1c7fc069bc
Window Phone Coding I’ve been coding using Cordova to create a cross platform app for ordering Taxis. I’m currently porting to WP7. This was the first time I coded for Microsofts Silverlight. It is funny how difficult simple tasks can become when you don’t know your way around the basics.

Problem was rather simple. Two classes the MainPage and a custom Plugin needed to communicate. Reason for this was that I had to add a native map and native buttons, because my Openlayer based solution didn’t give a nice user experience.

Adding the map and buttons to xaml file were easy, but how can I communicate with the map and buttons from my plugin? As an after thought it was quite easy, but it took a long time to figure it out.

So two classes MainPage and MyPlugin. MainPage had three buttons, which raised click events. These events needed to be relayed to the Javascript functions. Javascript needed to attach buttons to specific functions after it loaded.

It turned out that nothing needed to be done for the MainPage, but it took some figuring out.

Implementation

Steps were:

  1. find control from the xaml.
  2. manipulate or attach event handler to the control
  3. listen to events from control

First problem how to find the control? After many tries and reading documentation it become obvious that the way to go was to access the App instance and work my way current ApplicationPage. Then use FindName to find the control I wanted to manipulate or listen. Easy enough.

var mypage = App.Current.RootVisual.Content; – wrong
var button = mypage.FindName("mybutton") as System.Windows.Controls.Button; – ok

problems

  1. App is not defined – fix: namespace of the App needed to be used
  2. Need to do some casting to get my page
  3. At run time I get exeption, because UI is in different thread than the Plugin

fixes

so to get mypage
var mypage = ((PhoneApplicationFrame)MyApp.App.Current.RootVisual).Content as MyApp.MainPage;

next line:
var button = mypage.FindName("mybutton") as System.Windows.Controls.Button;

is ok. But there is a big problem. At run time there is the exception mentioned earlier. We can’t call the methods on MainPage directly. To by pass this we need to use Dispatcher, which will invoke the call in the correct thread.

Call becomes
Deployment.Current.Dispatcher.BeginInvoke(() => {
var mypage = ((PhoneApplicationFrame)MyApp.App.Current.RootVisual).Content as MyApp.MainPage;
var button = mypage.FindName("mybutton") as System.Windows.Controls.Button;
button.Click += new RoutedEventHandler(this.fireEvent);
});

or we can use a delegate

add a member to our plugin

public delegate void ButtonEventDelegate(string str);

Now it is possible do the previous bit more neatly

Deployment.Current.Dispatcher.BeginInvoke(new ButtonEventDelegate(HandleButtonClick), argument_array);

HandleButtonClick is simple function that executes same stuff that is inside brackets in the first BeginInvoke command.

fireEvent function needs to be something like this
public void fireEvent(object sender, EventArgs e)
{
var button = sender as System.Windows.Controls.Button;
// sending message to Cordova i.e. Javascript
string[] strs = new string[1];
strs[0] = button.Name;
var args = new ScriptCallback("testFunction",strs);
InvokeCustomScript(args)
}

And that is pretty much all there is to it.

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http://www.creabros.fi/index.php?id=73 Thu, 11 Oct 2012 01:22:24 GMT Kalle Kuismanen tag:www.creabros.fi,2012-10-10:26a712242462e138d6e14fdd1c6b9152/8010bd9235b0d86f1d20644b729faba3
Difference between bike and train Somewhere in Finland
My wife and I biked from Helsinki to Kokkola along the baltic sea, which is about 950 Km. It took us two and half weeks.

We came back by train. It took little over five hours.

I think we enjoyed the biking more, even though the train had more comfortable seats.

It not about getting there, it's about being here

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http://www.creabros.fi/index.php?id=72 Sun, 07 Oct 2012 01:03:01 GMT Kalle Kuismanen tag:www.creabros.fi,2012-10-06:26a712242462e138d6e14fdd1c6b9152/057c0f53b772235a315842b871531999