WPF défilement chapiteau - HandOffBehavior

Question

J'essaie de comprendre comment utiliser au mieux la technique HandOffBehavior de WPF. En ce moment, j'ai une erreur de défilement dans mon application qui anime l'ouverture, fait défiler le message d'erreur, puis se ferme.

Je commençais juste à construire cette application WPF cette semaine. Le problème est que je n'arrive pas à me préparer gracieusement à un scénario comme lorsque l'utilisateur clique deux fois ou plus sur le bouton de connexion à intervalles réguliers. Je voudrais voir le chapiteau d'erreur seulement continuer à envoyer le texte d'erreur à travers l'écran lorsque l'utilisateur commet un tel comportement avec le bouton de connexion plutôt que d'ouvrir et de fermer les temps redondants multiples de sélection, etc. Voici le code approprié.

MainWindow.xaml.cs:

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.Navigation; 
using System.Windows.Shapes; 
using System.Data.Entity; 
using System.Windows.Media.Animation; 
using PasswordHash; 

namespace ChatClient 
{ 
    /// <summary> 
    /// Interaction logic for MainWindow.xaml 
    /// </summary> 
    public partial class MainWindow : Window 
    { 
     public MainWindow() 
     { 
      InitializeComponent(); 
     } 

     private void logIn(object sender, RoutedEventArgs e) 
     { 
      string nameRecord = ""; 
      string passRecord = ""; 

      if (UsernameField.Text == "" || UserPassField.Password == "") 
      { 
       openErrorMarquee("Username and password required"); 
      } 
      else 
      { 
       using (otongadgethubEntities logCheck = new otongadgethubEntities()) 
       { 
        var userNullCheck = logCheck.users.FirstOrDefault(a => a.username == UsernameField.Text); 
        if (userNullCheck == null) 
        { 
         openErrorMarquee("Username does not exist"); 
        } 

        if (userNullCheck != null) 
        { 
         nameRecord = userNullCheck.username; 
        } 

        if (nameRecord == UsernameField.Text) 
        { 
         passRecord = Encrypt.MD5(UserPassField.Password).ToLower(); 
         if (passRecord == userNullCheck.password) 
         { 
          //Yay! User logged in! 
         } 
         else 
         { 
          openErrorMarquee("Password invalid"); 
         } 
        } 
       } 
      } 
     } 

     private void openErrorMarquee(string errorMessage) 
     { 
      errorMarquee.Visibility = System.Windows.Visibility.Visible; 

      DoubleAnimation openMarquee = new DoubleAnimation(); 
      openMarquee.From = 0; 
      openMarquee.To = 17; 
      openMarquee.Duration = new Duration(TimeSpan.FromSeconds(1.0)); 
      openMarquee.Completed += (s, doneEvent) => errorMarqueeScroll(errorMessage); 
      errorMarquee.BeginAnimation(Rectangle.HeightProperty, openMarquee, HandoffBehavior.Compose); 
     } 

     private void errorMarqueeScroll(string errorMessage) 
     { 
      errorText.Text = errorMessage; 
      errorText.Visibility = System.Windows.Visibility.Visible; 

      double height = errorCanvas.ActualHeight - errorText.ActualHeight; 
      errorText.Margin = new Thickness(0, height/2, 0, 0); 
      DoubleAnimation doubleErrorAnimation = new DoubleAnimation(); 
      doubleErrorAnimation.From = -errorText.ActualWidth; 
      doubleErrorAnimation.To = errorCanvas.ActualWidth; 

      //doubleErrorAnimation.RepeatBehavior = RepeatBehavior.Forever; 
      doubleErrorAnimation.Completed += new EventHandler(closeErrorMarquee); 
      doubleErrorAnimation.Duration = new Duration(TimeSpan.FromSeconds(7.0)); 
      errorText.BeginAnimation(Canvas.RightProperty, doubleErrorAnimation); 
     } 

     private void closeErrorMarquee(object sender, EventArgs e) 
     { 
      DoubleAnimation closeMarquee = new DoubleAnimation(); 
      closeMarquee.From = 17; 
      closeMarquee.To = 0; 
      closeMarquee.Duration = new Duration(TimeSpan.FromSeconds(1.0)); 
      closeMarquee.Completed += (s, doneEvent) => { 
       errorMarquee.Visibility = System.Windows.Visibility.Hidden; 
       errorText.Visibility = System.Windows.Visibility.Hidden; 
      }; 
      errorMarquee.BeginAnimation(Rectangle.HeightProperty, closeMarquee, HandoffBehavior.Compose); 
     } 
    } 
} 

Et voici le XAML pour ceux qui ont besoin de voir la fenêtre aussi:

<Window 
     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="ChatClient.MainWindow" 
     Title="MainWindow" Height="350" Width="525" Icon="media/favicon.gif" Background="#FF3C3636" Foreground="{x:Null}"> 
    <Window.Resources> 
     <Storyboard x:Key="logolayer2excompsoundfad_mp4"/> 
    </Window.Resources> 
    <Window.BorderBrush> 
     <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> 
      <GradientStop Color="Black" Offset="0"/> 
      <GradientStop Color="#FF6F6D95" Offset="1"/> 
     </LinearGradientBrush> 
    </Window.BorderBrush> 
    <Window.Triggers> 
     <EventTrigger RoutedEvent="FrameworkElement.Loaded"> 
      <BeginStoryboard Storyboard="{StaticResource logolayer2excompsoundfad_mp4}"/> 
     </EventTrigger> 
    </Window.Triggers> 
    <Grid> 
     <Rectangle x:Name="Menu" Fill="#755E5E83" HorizontalAlignment="Left" Height="273" Margin="35,23,0,0" Stroke="Black" VerticalAlignment="Top" Width="446" RadiusY="27.5" RadiusX="27.5"/> 
     <Button Content="Log In" HorizontalAlignment="Left" Height="80" Margin="162,200,0,0" Style="{DynamicResource OTonButtonStyle1}" VerticalAlignment="Top" Width="187" FontFamily="Impact" FontSize="26.667" Foreground="#FF1C045B" Click="logIn"/> 
     <TextBox x:Name="UsernameField" HorizontalAlignment="Left" Height="25" Margin="204,57,0,0" TextWrapping="Wrap" Text="[Username]" VerticalAlignment="Top" Width="193" Background="#BD251E1E" UseLayoutRounding="False" FontFamily="Copperplate Gothic Light" FontSize="16"> 
      <TextBox.Foreground> 
       <LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0"> 
        <GradientStop Color="#FF1E2E95" Offset="0.5"/> 
        <GradientStop Color="White" Offset="1"/> 
       </LinearGradientBrush> 
      </TextBox.Foreground> 
     </TextBox> 
     <TextBlock HorizontalAlignment="Left" Height="16" Margin="98,57,0,0" TextWrapping="Wrap" Text="Username:" VerticalAlignment="Top" Width="101" FontFamily="Copperplate Gothic Light" FontSize="16"> 
      <TextBlock.Foreground> 
       <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> 
        <GradientStop Color="#FF0A1D5F" Offset="0.374"/> 
        <GradientStop Color="#FF6E7FB9" Offset="1"/> 
       </LinearGradientBrush> 
      </TextBlock.Foreground> 
     </TextBlock> 
     <PasswordBox x:Name="UserPassField" HorizontalAlignment="Left" Height="25" Margin="204,99,0,0" VerticalAlignment="Top" Width="193" Background="#BD251E1E" UseLayoutRounding="False" FontFamily="Copperplate Gothic Light" FontSize="16"> 
      <PasswordBox.Foreground> 
       <LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0"> 
        <GradientStop Color="#FF1E2E95" Offset="0.5"/> 
        <GradientStop Color="White" Offset="1"/> 
       </LinearGradientBrush> 
      </PasswordBox.Foreground> 
     </PasswordBox> 
     <TextBlock HorizontalAlignment="Left" Height="16" Margin="98,99,0,0" TextWrapping="Wrap" Text="Password:" VerticalAlignment="Top" Width="101" FontFamily="Copperplate Gothic Light" FontSize="16"> 
      <TextBlock.Foreground> 
       <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> 
        <GradientStop Color="#FF0A1D5F" Offset="0.374"/> 
        <GradientStop Color="#FF6E7FB9" Offset="1"/> 
       </LinearGradientBrush> 
      </TextBlock.Foreground> 
     </TextBlock> 
     <Canvas ClipToBounds="True" Name="errorCanvas" Width="446" Height="17" Margin="36,152,35,151"> 
      <Rectangle x:Name="errorMarquee" Fill="#FF0A0A0C" HorizontalAlignment="Left" Height="17" Stroke="#FF5B1D1D" VerticalAlignment="Top" Width="446" Canvas.Left="-1" Visibility="Hidden"/> 
      <TextBlock x:Name="errorText" HorizontalAlignment="Left" Height="16" TextWrapping="Wrap" Text="TextBlock" VerticalAlignment="Top" Width="690" FontFamily="Copperplate Gothic Bold" FontSize="16" Foreground="#FF7E0202" Visibility="Hidden"/> 
     </Canvas> 
    </Grid> 
</Window> 

Quelqu'un a des suggestions, peut-être?

Answer 1

vous pouvez simplement utiliser un drapeau pour vérifier

private static flag = true; 
private void logIn(object sender, RoutedEventArgs e) 
    { 
     if(flag){ 
     flag=false; 
     string nameRecord = ""; 
     string passRecord = ""; 

     if (UsernameField.Text == "" || UserPassField.Password == "") 
     { 
      openErrorMarquee("Username and password required"); 
     } 
     else 
     { 
      using (otongadgethubEntities logCheck = new otongadgethubEntities()) 
      { 
       var userNullCheck = logCheck.users.FirstOrDefault(a => a.username == UsernameField.Text); 
       if (userNullCheck == null) 
       { 
        openErrorMarquee("Username does not exist"); 
       } 

       if (userNullCheck != null) 
       { 
        nameRecord = userNullCheck.username; 
       } 

       if (nameRecord == UsernameField.Text) 
       { 
        passRecord = Encrypt.MD5(UserPassField.Password).ToLower(); 
        if (passRecord == userNullCheck.password) 
        { 
         //Yay! User logged in! 
        } 
        else 
        { 
         openErrorMarquee("Password invalid"); 
        } 
       } 
      } 
     } 
     } 
     else 
     { 
     openErrorMarquee("you pressed more one time"); 
     } 
    } 

Answer 2

Vous pouvez utiliser StopWatch pour vérifier les clics rapides. Dans l'exemple de code donné ci-dessous, essayez d'appuyer sur le bouton lent et rapide.

Stopwatch w = new Stopwatch(); 
    long milliseconds_prev = 0; 

    private void Button_Click(object sender, RoutedEventArgs e) 
    { 
     if (_checkFastClicks()) 
     { 
      Debug.WriteLine("Fast click"); 
     } 
     else 
      Debug.WriteLine("Slow click"); 
    } 

    bool _checkFastClicks() 
    { 
     bool result = false; 

     if (!w.IsRunning) 
     { 
      w.Start(); 
     } 
     if (w.IsRunning) 
     { 
      if (w.ElapsedMilliseconds - milliseconds_prev < 500)//imp 
      { 
       if (w.ElapsedMilliseconds > 0) 
       { 
        milliseconds_prev = w.ElapsedMilliseconds; 
        result = true; 
       } 
       else 
        result = false; 
      } 
      else 
      { 
       milliseconds_prev = 0; 
       w.Reset(); 
       w.Stop(); 
       result = false; 
      } 
     } 

     return result; 
    }