Solved

Pause and Resume WPF Slideshow

Posted on 2009-05-12
3
2,309 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++;
            }
        }
    }
}

Open in new window

0
Comment
Question by:ctrlctrl
  • 2
3 Comments
 
LVL 5

Accepted Solution

by:
rendaduiyan earned 500 total points
ID: 24372175
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;
        }

Open in new window

0
 

Author Comment

by:ctrlctrl
ID: 24374397
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
ID: 24377158
excellent .. It worked
0

Featured Post

3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Variable Event ? 3 27
Simple Injector with Web Service 4 40
Why does my excel data start at B1 instead of A1. 9 83
parsing JSON help 1 9
What my article will show is if you ever had to do processing to a listbox without being able to just select all the items in it. My software Visual Studio 2008 crystal report v11 My issue was I wanted to add crystal report to a form and show…
For a while now I'v been searching for a circular progress control, much like the one you get when first starting your Silverlight application. I found a couple that were written in WPF and there were a few written in Silverlight, but all appeared o…
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question