Solved

Pause and Resume WPF Slideshow

Posted on 2009-05-12
3
2,283 Views
Last Modified: 2013-12-17
hi , I am attaching a code , to play a slideshow of pictures from your "MyPictures" folder of your PC

Create a new project of the type "WPF Application" and replace window1.xaml and window1.xaml.cs code with my code below

I would like to implement a funtionality to Pause and Resume WPF Slideshow
When the slide show is paused, a text on the top right corner should be displayed as "Paused"

Make Sure you have pictures in "MyPictures" folder of your PC
Please help me implement these events...
//In window.xaml
 

<Window x:Class="MySlideShow.Window1"

        x:Name="Window"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    Title="My SlideShow" Height="480" Width="640" WindowStartupLocation="CenterScreen" WindowState="Maximized" Background="#FF000000">

    <Grid x:Name="LayoutRoot">

        <Grid.ColumnDefinitions>

            <ColumnDefinition Width="*"/>

        </Grid.ColumnDefinitions>

        <Rectangle x:Name="rec1" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>

        <Rectangle x:Name="rec2" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>

    </Grid>

</Window>
 
 

// window1.xaml.cs code
 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Media.Animation;

using System.Windows.Navigation;

using System.Windows.Shapes;

using System.Windows.Threading;
 

namespace MySlideShow

{

    /// <summary>

    /// Interaction logic for Window1.xaml

    /// </summary>

    public partial class Window1 : Window

    {
 

        string path;

        string[] files;

        List<string> showPictures = new List<string>();

        int count = 0;

        DispatcherTimer dt = new DispatcherTimer();

        int currentRect = 1;

        double fade = 0.5;
 

        public Window1()

        {

            InitializeComponent();

            this.Show();
 

            //Get The Picture files from the My Pictures Directory

            files = System.IO.Directory.GetFiles(Environment.GetFolderPath(Environment.SpecialFolder.MyPictures));
 

            for (int i = 0; i < files.Length; i++)

            {

                if (files[i].ToUpper().EndsWith(".JPG") ||

                    files[i].ToUpper().EndsWith(".PNG") ||

                    files[i].ToUpper().EndsWith(".GIF") ||

                    files[i].ToUpper().EndsWith(".TIF"))

                {

                    showPictures.Add(files[i]);

                }

            }
 

            dt_Tick(this, new EventArgs());

            dt.Interval = TimeSpan.FromSeconds(2);

            dt.Tick += new EventHandler(dt_Tick);
 

        }
 

        void dt_Tick(object sender, EventArgs e)

        {

            if (showPictures.Count < 1)

            {

                MessageBox.Show("No Images Available");

                this.Close();

                dt.Stop();

            }

            else

            {

                Image img = new Image();

                img.Source = new BitmapImage(new Uri(showPictures[count]));
 

                if (currentRect == 1)

                {

                    rec1.Opacity = 0;

                    VisualBrush vb = new VisualBrush(img);

                    vb.Stretch = Stretch.UniformToFill;

                    rec1.Fill = vb;

                    rec1.BeginAnimation(FrameworkElement.OpacityProperty, new DoubleAnimation(1, TimeSpan.FromSeconds(fade)));

                    rec2.BeginAnimation(FrameworkElement.OpacityProperty, new DoubleAnimation(0, TimeSpan.FromSeconds(fade)));

                   

                }

                else

                {

                    rec2.Opacity = 0;

                    VisualBrush vb = new VisualBrush(img);

                    vb.Stretch = Stretch.UniformToFill;

                    rec2.Fill = vb;

                    rec2.BeginAnimation(FrameworkElement.OpacityProperty, new DoubleAnimation(1, TimeSpan.FromSeconds(fade)));

                    rec1.BeginAnimation(FrameworkElement.OpacityProperty, new DoubleAnimation(0, TimeSpan.FromSeconds(fade)));

                }

                dt.Start();

                if (currentRect == 1)

                {

                    currentRect = 2;

                }

                else { currentRect = 1; }

            }

            if (count == showPictures.Count - 1)

            {

                count = 0;

            }

            else

            {

                count++;

            }

        }

    }

}

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Question by:ctrlctrl
  • 2
3 Comments
 
LVL 5

Accepted Solution

by:
rendaduiyan earned 500 total points
Comment Utility
your implementation is based on a  timer. if you want to pause, you have to stop the timer.
So you have to write a event handler for KeyPressed or mouse button, in which you can stop the timer.
something like this.

public bool PreFilterMessage(ref Message m)

        {

            if (m.Msg == WM_KEYDOWN)

            {

                return HandleKeys((Keys)((int)m.WParam) & Keys.KeyCode);

            }

            return false;

        }

public bool HandleKeys(Keys keycode)

        {

            bool ret = true;

            switch (keycode)

            {

                case Keys.P:dt.stop; break;

                case Keys.S:dt.start;break;

            }

            return ret;

        }

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Author Comment

by:ctrlctrl
Comment Utility
Hi rendaduiyan,


Thank You for the solution,

But will the slideshow resume at the same picture where it paused? with this implementation
0
 

Author Comment

by:ctrlctrl
Comment Utility
excellent .. It worked
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