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POWpf c# ticker rss news reader
 

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  1. POWpf c# ticker rss news reader
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    <p>I'm making an application for wpf C# in expression blend 4. I have followed RumorMills tutorial over at <a href="http://www.jarloo.com/rumormill4/" rel="nofollow">http://www.jarloo.com/rumormill4/</a></p> <p>However he doesn't provide a full tutorial, so i have taken som of his code trying to implement it into my own "home media center" application for testing. I have sorted out 90% of the errors, just one remaining - i hope it doesn't come any additional ones... You could find any additional code not included in the question over at his post. See my code below:</p> <p>Main code file for the screen hosting the news ticker</p> <pre><code>using System; using System.Collections.Generic; 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.Shapes; using System.Windows.Media.Animation; using Microsoft.Expression.Controls; using MySoftware_Inspire.Feed; using System.ComponentModel; namespace blablabla { /// &lt;summary&gt; /// Interaction logic for MainWindow.xaml /// &lt;/summary&gt; public partial class MainWindow : Window { List&lt;string&gt; weatherwords = new List&lt;string&gt; {"weather", "in", "umbrella", "rain", "sun", "sunny", "overcast", "forecast", "cloudy"}; List&lt;string&gt; mathwords = new List&lt;string&gt; {"+", "-", "*", "/", ":"}; String searchInput; System.Windows.Threading.DispatcherTimer dispatcherTimer; private readonly FeedManager manager = new FeedManager(); private readonly Ticker&lt;TickerItem&gt; ticker; private delegate void FeedDelegate(FeedItem itm); //would be better to detect the height of the titlebar //and window chrome instead of hardcoding this. private const int FULL_HEIGHT = 75; private const int SHORT_HEIGHT = 55; private int height = FULL_HEIGHT; public MainWindow() { this.InitializeComponent(); Width = SystemParameters.PrimaryScreenWidth; ticker = new Ticker&lt;TickerItem&gt;(LayoutRoot) {Speed = new TimeSpan(0, 2, 0)}; ticker.ItemDisplayed += ticker_ItemDisplayed; manager.NewFeedItem += manager_NewFeedItem; // Insert code required on object creation below this point. } private void ticker_ItemDisplayed(object sender, ItemEventArgs&lt;TickerItem&gt; e) { txtItems.Text = ticker.Items.Count.ToString(); manager.MarkFeedAsRead(e.Item.FeedItem); } private void manager_NewFeedItem(object sender, ItemEventArgs&lt;FeedItem&gt; e) { //Got a new article. Marshall to the UI thread Dispatcher.Invoke(DispatcherPriority.Background, new FeedDelegate(AddItem), e.Item); } private void AddItem(FeedItem itm) { lock (this) { ticker.Items.Enqueue(new TickerItem(itm)); txtItems.Text = ticker.Items.Count.ToString(); } } private void homequicktip_DoubleClick(object sender, System.Windows.Input.MouseButtonEventArgs e) { //Doubleclicked to homequicktip notification DoubleAnimation fadeouthomequicktip = new DoubleAnimation(); fadeouthomequicktip.From = 1; fadeouthomequicktip.To = 0.0; fadeouthomequicktip.Duration = new Duration(TimeSpan.FromSeconds(1)); //Play fade out animation on homequicktip homequicktip.BeginAnimation(Callout.OpacityProperty, fadeouthomequicktip); } private void MainWindow_Activated(object sender, System.EventArgs e) { //Start feed manager manager.Start(); //Load up clock and play startup animations dispatcherTimer = new System.Windows.Threading.DispatcherTimer(); dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick); dispatcherTimer.Interval = new TimeSpan(0,0,1); dispatcherTimer.Start(); //Rotate arcs for nice effect //Arc 1 rotation DoubleAnimation arcrotateAnim1 = new DoubleAnimation(); arcrotateAnim1.From = -70; arcrotateAnim1.To = -3600; arcrotateAnim1.AutoReverse = true; arcrotateAnim1.Duration = new Duration(TimeSpan.FromSeconds(30)); arcrotateAnim1.RepeatBehavior = RepeatBehavior.Forever; arc1.RenderTransformOrigin = new Point(0.5, 0.5); RotateTransform rt = new RotateTransform(); arc1.RenderTransform = rt; rt.BeginAnimation(RotateTransform.AngleProperty, arcrotateAnim1); //Arc 2 rotation DoubleAnimation arcrotateAnim2 = new DoubleAnimation(); arcrotateAnim2.From = 90; arcrotateAnim2.To = 3690; arcrotateAnim2.AutoReverse = true; arcrotateAnim2.Duration = new Duration(TimeSpan.FromSeconds(30)); arcrotateAnim2.RepeatBehavior = RepeatBehavior.Forever; arc1.RenderTransformOrigin = new Point(0.5, 0.5); RotateTransform rt2 = new RotateTransform(); arc2.RenderTransform = rt2; rt2.BeginAnimation(RotateTransform.AngleProperty, arcrotateAnim2); } private void Window_Closing(object sender, CancelEventArgs e) { manager.Stop(); manager.SaveReadFeeds(); } private void Window_SizeChanged(object sender, SizeChangedEventArgs e) { if (e.HeightChanged) { if (e.NewSize.Height != height) Height = height; } } private void btnLock_MouseUp(object sender, MouseButtonEventArgs e) { if (WindowStyle == WindowStyle.None) { WindowStyle = WindowStyle.ToolWindow; height = FULL_HEIGHT; Height = height; } else { WindowStyle = WindowStyle.None; height = SHORT_HEIGHT; Height = height; } } private void btnStop_MouseUp(object sender, MouseButtonEventArgs e) { btnStop.Visibility = Visibility.Collapsed; btnGo.Visibility = Visibility.Visible; ticker.Stop(); } private void btnGo_MouseUp(object sender, MouseButtonEventArgs e) { btnStop.Visibility = Visibility.Visible; btnGo.Visibility = Visibility.Collapsed; ticker.Start(); } private void dispatcherTimer_Tick(object sender, EventArgs e) { //Updating clock timeLabel.Content = DateTime.Now.ToString(); dispatcherTimer.Start(); } private void searchTextbox_KeyDown(object sender, System.Windows.Input.KeyEventArgs e) { if (e.Key == System.Windows.Input.Key.Enter) { //Enter key was pressed - begin search //Create instance of SearchWindow SearchWindow SearchWindow = new SearchWindow(); //Memorize current text in TextBox so it doesn't look like we've changed anything searchInput = searchTextBox.Text; //Pressed enter on searchTextBox if (searchTextBox.Text.Contains(" ")) { //Search input contains spaces which needs to be removed before search can happen searchTextBox.Text.Replace(" ", "+"); } //Open search SearchWindow.searchBrowser.Navigate("http://www.wolframalpha.com/input/?i=" + searchTextBox.Text); SearchWindow.Show(); } } } } </code></pre> <p>TickerItem.xaml:</p> <pre><code>&lt;UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="Jarloo.RumorMill4.TickerItem" x:Name="UserControl" d:DesignWidth="640" d:DesignHeight="480" Height="39"&gt; &lt;Grid Height="39" &gt; &lt;TextBlock x:Name="PART_TextBlock" Foreground="#FFFFFFFF" Height="18" VerticalAlignment="Top" TextWrapping="NoWrap"&gt; &lt;Hyperlink x:Name="hlLink" RequestNavigate="hpLink_RequestNavigate"&gt; &lt;TextBlock x:Name="txtTitle" Foreground="#FFFFFFFF" TextWrapping="NoWrap"&gt;&lt;/TextBlock&gt; &lt;/Hyperlink&gt; &lt;/TextBlock&gt; &lt;TextBlock x:Name="txtDate" Margin="0,12,0,1" Foreground="#FF939393" TextWrapping="NoWrap" FontSize="10"/&gt; &lt;TextBlock x:Name="txtSource" Margin="0,20,0,1" Foreground="#FFD47432" TextWrapping="NoWrap" FontSize="10" /&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre> <p>TickerItem.xaml.cs:</p> <pre><code>using System; using System.Diagnostics; using System.Windows.Controls; using System.Windows.Navigation; using blablablabla.Feed; namespace blablablabla { public partial class TickerItem { public TickerItem(FeedItem item) { InitializeComponent(); FeedItem = item; txtDate.Text = item.PubDate; txtTitle.Text = item.Title; if (item.Link.ToLower().StartsWith("http")) { try { hlLink.NavigateUri = new Uri(item.Link); } catch { } } txtSource.Text = item.Source; } public FeedItem FeedItem { get; private set;} public string PubDate { get { TextBlock date = (TextBlock)FindName("txtDate"); return date.Text; } } public string Title { get { return txtTitle.Text; } } public string Url { get { return hlLink.NavigateUri.ToString(); } } public string Source { get { return txtSource.Text; } } private void hpLink_RequestNavigate(object sender, RequestNavigateEventArgs e) { Process.Start(new ProcessStartInfo(e.Uri.ToString())); } } } </code></pre> <p>Ticker.cs:</p> <pre><code>using System; using System.Collections.Generic; using System.Windows; using System.Windows.Controls; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Threading; namespace blablablabla { public class Ticker&lt;T&gt; where T : FrameworkElement { private readonly DispatcherTimer displayTimer = new DispatcherTimer(); public EventHandler&lt;ItemEventArgs&lt;T&gt;&gt; ItemDisplayed; public bool Running { get; set; } public double SeperatorSize { get; set; } public TimeSpan Speed { get; set; } public Queue&lt;T&gt; Items { get; set; } public Panel Container { get; private set; } public void Stop() { displayTimer.Stop(); Running = false; } public void Start() { displayTimer.Start(); displayTimer.Interval = new TimeSpan(0,0,0,1); Running = true; } public Ticker(Panel container) { SeperatorSize = 25; Container = container; Container.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity)); Container.Arrange(new Rect(Container.DesiredSize)); Speed = new TimeSpan(0, 0, 0, 40); Items = new Queue&lt;T&gt;(); displayTimer.Tick += displayTimer_Tick; displayTimer.Start(); Running = true; } private void displayTimer_Tick(object sender, EventArgs e) { DisplayNextItem(); } private void DisplayNextItem() { if (Items.Count == 0) return; T item = Items.Dequeue(); Container.Children.Add(item); AnimateMove(item); if (ItemDisplayed != null) ItemDisplayed(this, new ItemEventArgs&lt;T&gt;(item)); } private void AnimateMove(FrameworkElement e) { const double to = -500; e.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity)); e.Arrange(new Rect(e.DesiredSize)); double from = Container.ActualWidth; int unitsPerSec = Convert.ToInt32(Math.Abs(from - to)/Speed.TotalSeconds); int nextFire = Convert.ToInt32((e.ActualWidth + SeperatorSize)/unitsPerSec); displayTimer.Stop(); displayTimer.Interval = new TimeSpan(0, 0, nextFire); displayTimer.Start(); TaggedDoubleAnimation ani = new TaggedDoubleAnimation { From = from, To = to, Duration = new Duration(Speed), TargetElement = e }; ani.Completed += ani_Completed; TranslateTransform trans = new TranslateTransform(); e.RenderTransform = trans; trans.BeginAnimation(TranslateTransform.XProperty, ani, HandoffBehavior.Compose); } private void ani_Completed(object sender, EventArgs e) { Clock clock = (Clock) sender; TaggedDoubleAnimation ani = (TaggedDoubleAnimation) clock.Timeline; FrameworkElement element = ani.TargetElement; Container.Children.Remove(element); } } } </code></pre> <p>The error is as follows - it may not be 100% properly translated because i'm norwegian and the error was printed out in norwegian. Have a look:</p> <p>Error:</p> <p>The type blablablabla.TickerItem cannot be used as the type parameter T in the generic type or method blablablabla.Ticker. It does not exist any implicit reference-convertion from blablablabla.TickerItem to System.Windows.FrameworkElement</p> <p>Do any of you guys know what this means?</p> <p>I'm REALLY stuck here, please help! Thanks!</p>
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    1. COOn which line are you getting this error?
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      1. USKenneth
    2. COLine 29, on the newly added code file, check the code now. This line: private readonly Ticker<TickerItem> ticker;
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      1. USuser1446632
    3. COCould you try including the full namespace? It's possible that it's mixing up references. Normally this should work
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      1. USKenneth
 

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