Mike Francis: My Mobile Home

Friday, July 16, 2010

There are a couple of ways to go about detecting Tap and Hold in Windows Phone 7. This method uses the XNA Touch Gesture recognizer (Microsoft.Xna.Framework.Input.Touch) in a Silverlight application. The touch gesture recognizer can tell the difference between tap, double-tap, and hold gestures. Additionally, using the XNA gesture recognizer you don’t need to worry about mistaking a pan/drag for a hold: if you move your finger too much, a tap or hold won’t be recognized. Other solutions involve inferring these events through the use of a timer. A common application of this is to implement a context menu in your Windows Phone 7 application.

This method handles the ManipulationStarted event to detect the initial tap. In this event, you tell the gesture recognizer which gestures you want to monitor. In this case, tap, double-tap, and hold. (This is also done in the constructor of the page, to initialize the recognizer.)

Next a 500 ms timer is started. The timer is used to detect when enough ‘hold time’ has elapsed. When the ‘hold time’ threshold is met, the gesture is detected, the gesture recognizer is reset, and the timer is stopped. This is where you would invoke the context menu. (Not implemented here.) A timer is only necessary here for the implementation of a context-menu. You could detect the gesture in the ManipulationCompleted event handler, which fires when the user releases their finger from the screen.

 public MainPage()
{
    InitializeComponent();
    TouchPanel.EnabledGestures = GestureType.Tap | GestureType.Hold | GestureType.DoubleTap;
}
 
System.Windows.Threading.DispatcherTimer dt;
public void StartHoldTimer()
{
    dt = new System.Windows.Threading.DispatcherTimer();
    dt.Interval = new TimeSpan(0, 0, 0, 0, 500);// 500 Milliseconds 
    dt.Tick += new EventHandler(dt_Tick);
    dt.Start();
}
 
int cnt = 0;
void dt_Tick(object sender, EventArgs e)
{
    if (cnt == 3) // 500 ms * 4 == 2 seconds
    {
        cnt = 0;
        GetGesture();
        // disable all events
        TouchPanel.EnabledGestures = GestureType.None;
        // stop the hold timer
        StopHoldTimer();
    }
    cnt++;
}
 
void StopHoldTimer()
{
    dt.Stop();
    cnt = 0;
}
 
private void GetGesture()
{
    if (TouchPanel.IsGestureAvailable)
    {
        GestureSample gs = TouchPanel.ReadGesture();
        if (gs.GestureType == GestureType.Hold)
        {
            string gestureString = string.Format("{0}: {1}", gs.GestureType, gs.Position);
            // Tap and Hold detected, report position
            Debug.WriteLine(gestureString);
        }
    }
}
 
private void PhoneApplicationPage_ManipulationStarted(object sender, ManipulationStartedEventArgs e)
{
    // specify what events the XNA gesture recognizer will look out for
    TouchPanel.EnabledGestures = GestureType.Tap | GestureType.Hold | GestureType.DoubleTap;
    // start the hold timer
    StartHoldTimer();
}
 
private void PhoneApplicationPage_ManipulationCompleted(object sender, ManipulationCompletedEventArgs e)
{
    // disable all events
    TouchPanel.EnabledGestures = GestureType.None;
    // stop the hold timer
    StopHoldTimer();
}
 

Enjoy!

Mike

This work is licensed under a Creative Commons license.

Gestures | Silverlight | Windows Phone 7 | XNA

posted on Friday, July 16, 2010 3:23:45 PM UTC

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Friday, June 25, 2010

Windows Phone 7 : Code Snippet: Enumerate Files in Isolated Storage

This sample code uses the IsolatedStorageFile class to create a few test directories and populates them with files. Then it recursively enumerates the files and directories, displaying the output in the debug window.

 public void EnumerateIsolatedStorageFiles()
{
    try
    {
        // Get an isolated store for this applicaiton and put it into an
        // IsolatedStorageFile object.
 
        using (IsolatedStorageFile isoStore = 
            IsolatedStorageFile.GetUserStoreForApplication())
        {
            // Create sub directories and create files 
            // in them to test enumeration
            isoStore.CreateDirectory("A");
            IsolatedStorageFileStream streamA =
                new IsolatedStorageFileStream(@"A\TestFileA.Txt", FileMode.Create, isoStore);
 
            isoStore.CreateDirectory("B");
            IsolatedStorageFileStream streamB = 
                new IsolatedStorageFileStream(@"B\TestFileB.Txt", FileMode.Create, isoStore);
 
            isoStore.CreateDirectory("C");
            IsolatedStorageFileStream streamC = 
                new IsolatedStorageFileStream(@"C\TestFileC.Txt", FileMode.Create, isoStore);
 
            isoStore.CreateDirectory(@"C\1");
            IsolatedStorageFileStream streamC1 = 
                new IsolatedStorageFileStream(@"C\1\TestFileC1.Txt", FileMode.Create, isoStore);
 
            isoStore.CreateDirectory(@"D\1\2\3\4\5");
            IsolatedStorageFileStream streamD = 
                new IsolatedStorageFileStream(@"D\1\2\3\4\5\TestFileD.Txt", FileMode.Create, isoStore);
 
            streamA.Close();
            streamB.Close();
            streamC.Close();
            streamC1.Close();
            streamD.Close();
 
            // There might be a small delay between when the above code
            // executes and when the files are created in the store.
            // Closing and opening the store in this example ensures that
            // the common language runtime has finished creating the files.
        } // using
 
        using (IsolatedStorageFile isoStore = 
            IsolatedStorageFile.GetUserStoreForApplication())
        {
            // List files in root
            foreach (string file in isoStore.GetFileNames())
            {
                Debug.WriteLine(file);
            }
            // Recursively enumerate sub-directories and list contents
            GetFiles(isoStore, @"\");
        } // using
    }
    catch (IsolatedStorageException e)
    {
        Debug.WriteLine(e.Message);
    }
}
 
// Recursively enumerate sub-directories
void GetFiles(IsolatedStorageFile isoStore, string directory)
{
    string[] DirNames;
    if (directory == @"\") 
        DirNames = isoStore.GetDirectoryNames();
    else
        DirNames = isoStore.GetDirectoryNames(directory + @"\*");
 
    foreach (string dir in DirNames)
    {
        string mDir = 
            directory == @"\" ? directory + dir : directory + @"\" + dir;
        foreach (string file in isoStore.GetFileNames(mDir + @"\*.*"))
        {
            Debug.WriteLine(file);
        }
        GetFiles(isoStore, mDir);
    }
}
 

Enjoy!

Mike

This work is licensed under a Creative Commons license.

Code | Isolated Storage | Windows Phone 7

posted on Friday, June 25, 2010 2:59:51 AM UTC

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Sunday, May 30, 2010

Bing for mobile – Voice Turn-by-Turn Directions – New and Improved UI!

One of my favorite Windows Mobile applications has been Bing (the application formerly known as “Live Search”). This application has saved my bacon on more than one occasion when travelling on business or vacation. The ability to search for vital resources, wherever I am, like the closest Starbucks has been invaluable to me.

While Live Search was great, the UI was a little clunky and was not developed with capacitive screens and the corresponding touch navigation in-mind. Capacitive screens while more sensitive to touch, have a larger minimum hit target size. Actually comparing Live Search to the new Bing is a good example of how an application designed for a resistive screen has been updated to also work with capacitive screens.

The usability has greatly improved. For example to starting navigating to the nearest Starbucks, you:

From the Bing home page, Tap ‘Speak’ and say ‘Starbucks’

Select the ‘Starbucks’ you want to go to

Tap the Car icon for driving directions

Tap on ‘Navigate’ (If you are on foot, select the ‘Walk’ tab for walking directions.)

Immediately a route is calculated for you and Silicon Sally is telling you where to go. Yes ‘telling you’, with voice directions! This is a huge improvement over Live Search that had text only turn-by-turn directions. In the Bing settings, you can specify if you want to route via the shortest or fastest route. You can also configure Bing to consider real-time traffic conditions when calculating your route.

Now featuring ‘auto-rerouting’! Live Search would prompt you will a demoralizing ‘Are you lost? Would you like to reroute from here?’ prompt whenever you deviated from your planned route. Bing for mobile smartly just tells you that it is ‘rerouting’ and updates your driving directions based on your current location.

All the great features of Live Search are still here like quick access to locally playing movies and show times.

You can install Bing for mobile from the Marketplace for Windows Phone here.

More information here.

Enjoy!

Mike

Applications | Bing | Windows Mobile

posted on Sunday, May 30, 2010 2:43:04 AM UTC

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Saturday, May 22, 2010

Windows Phone 7 Links this Week – Have you seen these?

Resources | Windows Phone 7 Series

posted on Saturday, May 22, 2010 12:36:24 AM UTC

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Friday, April 30, 2010

Install SQL Server Compact using the MultiCAB pattern

Update: I've updated the sample to be independent of the '\Program Files' string. Also, the sample now supports installing onto a Storage Card.

A popular sample for demonstrating how to install application dependencies via embedded CAB files is MultiCAB Install. With this pattern you can distribute dependant cab files via a single container CAB. “Can apps be distributed via Windows Marketplace for Mobile using this?”,you ask. Yes they can.

Installing SQL Server Compact dependencies is a good fit for this pattern. I have updated the sample here customized to distribute the latest SQL Server Compact for Windows Mobile devices.

The sample checks if SQL Server Compact 3.5 is installed (See IsSQLCEUpdateRequired() in mcsetup.cpp) and if not, launches the multicab EXE which installs each dependant cab in sequence. (See the multicab whitepaper included in the sample for an in-depth explanation of how it works.)

How does the sample check to see if v3.5 is installed? It checks the registry for the following entry:

 \Software\Microsoft\Microsoft SQL Server Compact Edition\v3.5
 

This this exists, then installation of the SQLCE cabs is skipped. Note that this registry key only exists if SQLCE has been installed via a CAB file. That is, this registry key does not exist of SQLCE is in ROM. As of this writing, 3.5 (SP1 or SP2) is not distributed in ROM. See here for a list of OS and corresponding SQLCE versions: Description of the various build versions of SQL Server Compact Edition.

The sample does not do version checking on the binaries. Therefore it does not detect if you are upgrading from SQLCE 3.5 SP1 to SP2. The way it is written now, it will not update the binaries to SP2. This sample does address the popular scenario of updating an ‘off the shelf’ device with the latest version of SQL Server Compact.