CODEWITHSUNDEEP
c#
Rabin
Rabin

Reputation: 1583

Animated Gif in form using C#

In my project, whenever a long process in being executed, a small form is displayed with a small animated gif file. I used this.Show() to open the form and this.Close() to close the form. Following is the code that I use.

public partial class PlzWaitMessage : Form
{
   public PlzWaitMessage()
   {
      InitializeComponent();
   }

   public void ShowSpalshSceen()
   {
      this.Show();
      Application.DoEvents();
   }

   public void CloseSpalshScreen()
   {
      this.Close();
   }
}

When the form opens, the image file do not immediately start animating. And when it does animate, the process is usually complete or very near completion which renders the animation useless. Is there a way I can have the gif animate as soon as I load the form?

Upvotes: 5

Views: 8042

Answers (3)

Some Random Guy
Some Random Guy

Reputation: 1

Use the gif in a PictureBox, and have it open using Form pWait = new Form(); pWait.Show();

Upvotes: 0

k.m
k.m

Reputation: 31454

Why not using threads? It's always good idea to learn something new.

You could simply put your "long process" in background thread, and use events to report to presentation layer, for example:

// in your "long process" class
public event Action<double> ReportCompletition;

// this method will start long process in separate background thread
public void Start()
{ 
    Thread thread = new Thread(this.LongProcess);
    thread.IsBackground = true;
    thread.Start();
}

private void LongProcess()
{
    // do something
    // report 10% completition by raising event
    this.ReportCompletition(0.1);
    // do something more
    this.ReportCompletition(0.5);
    // ... and so on
}

This way, all you have to do is implement simple method in your Form/UI, which will consume this information. 

public partial class MainApplicationWindow : Form
{
    private LongProcessClass _longProcess;

    public MainApplicationWindow
    {
        this.InitializeComponent();
        this._longProcess = new LongProcessClass();
        // bind UI updating method to long process class event
        this._longProcess.ReportCompletition += this.DisplayCompletitionInfo;
    }

    private void DisplayCompletitionInfo(double completition)
    {  
        // check if control you want to display info in needs to be invoked
        // - request is coming from different thread
        if (control.InvokeRequired)
        {
            Action<double> updateMethod = this.DisplayCompletitionInfo;
            control.Invoke(updateMethod, new object[] { completition });
        }
        // here you put code to do actual UI updating, 
        // eg. displaying status message
        else
        {
            int progress = (int) completition * 10;
            control.Text = "Please wait. Long process progress: " 
                + progress.ToString() + "%";
        }
    }

Of course, you can report anything you like from within long process. Be it completition rate, ready to display string messages, anything. You can also use events to report that long process has finished, broke, or any long process data you wish.

For more detailed information on this topic you might want to check MSDN tutorials on Threading and Events.

Upvotes: 4

GvS
GvS

Reputation: 52518

You should do the "long process" in a separate thread. I advice using the BackgroundWorker.

This will make your code more difficult though. One of the main reasons is, that you cannot communicate with the UI from the background thread.

Also note the warning from the linked page:

Caution

When using multithreading of any sort, you potentially expose yourself to very serious and complex bugs. Consult the Managed Threading Best Practices before implementing any solution that uses multithreading.

If this is too difficult, you could call Application.DoEvents very frequent from your "long process" code.

Whatever you choose, this will make it possible for the user to interact with your form. For instance closing it. You should be aware of this.

Upvotes: 3

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