Windows Presentation Foundation

TextBox PreviewKeyDown, PreviewKeyUp, PreviewTextInput, KeyDown, KeyUp and TextChanged events

Posted on by coder 


   
  
<Window x:Class="RoutedEvents.KeyPressEvents"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="KeyPressEvents" Height="400" Width="400" >
    <StackPanel>
          <DockPanel Margin="5">
            <TextBlock Margin="3" >Type here:</TextBlock>
            <TextBox PreviewKeyDown="KeyEvent" KeyDown="KeyEvent" 
                     PreviewKeyUp="KeyEvent" KeyUp="KeyEvent"
                     PreviewTextInput="TextInput"
                     TextChanged="TextChanged"></TextBox>
          </DockPanel>
      <ListBox Margin="5" Name="lstMessages"></ListBox>
      <CheckBox Margin="5" Name="chkIgnoreRepeat">Ignore Repeated Keys</CheckBox>
      <Button Click="cmdClear_Click" HorizontalAlignment="Right">Clear List</Button>
    </StackPanel>
</Window>


//File:Window.xaml.cs
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;

namespace RoutedEvents
{
    public partial class KeyPressEvents : System.Windows.Window
    {
        public KeyPressEvents()
        {
            InitializeComponent();
        }
                
        private void KeyEvent(object sender, KeyEventArgs e)
        {
            if ((bool)chkIgnoreRepeat.IsChecked &amp;&amp; e.IsRepeat) return;
            
            string message = "Event: " + e.RoutedEvent + " " + " Key: " + e.Key;
            lstMessages.Items.Add(message);            
        }

        private void TextInput(object sender, TextCompositionEventArgs e)
        {
            string message = "Event: " + e.RoutedEvent + " " + " Text: " + e.Text;
            lstMessages.Items.Add(message);
        }

        private void TextChanged(object sender, TextChangedEventArgs e)
        {
            string message = "Event: " + e.RoutedEvent;
            lstMessages.Items.Add(message);
        }

        private void cmdClear_Click(object sender, RoutedEventArgs e)
        {            
            lstMessages.Items.Clear();
        }
    }
}

Scrollable TextBox Column

Posted on by coder 


   
  
<Window x:Class="Content.ScrollableTextBoxColumn"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="ScrollableTextBoxColumn" Height="181" Width="283" MinWidth="250">

  <DockPanel>
    <Border DockPanel.Dock="Top"  BorderBrush="SteelBlue" BorderThickness="2">
    <StackPanel Margin="5" Orientation="Horizontal">
      <Button Padding="3" Click="LineUp">Line Up</Button>
      <Button Padding="3" Click="LineDown">Line Down</Button>
      <Button Padding="3" Click="PageUp">Page Up</Button>
      <Button Padding="3" Click="PageDown">Page Down</Button>
    </StackPanel>
  </Border>
  <ScrollViewer Name="scroller">
    <Grid Margin="0,10,0,0" Focusable="False">
      <Grid.RowDefinitions>
        <RowDefinition Height="Auto"></RowDefinition>
        <RowDefinition Height="Auto"></RowDefinition>
        <RowDefinition Height="Auto"></RowDefinition>
        <RowDefinition Height="Auto"></RowDefinition>
        <RowDefinition Height="Auto"></RowDefinition>
        <RowDefinition Height="Auto"></RowDefinition>
        <RowDefinition Height="Auto"></RowDefinition>
        <RowDefinition Height="Auto"></RowDefinition>
      </Grid.RowDefinitions>
      <Grid.ColumnDefinitions>
        <ColumnDefinition Width="Auto"></ColumnDefinition>
        <ColumnDefinition Width="*" MinWidth="50" MaxWidth="800"></ColumnDefinition>
        <ColumnDefinition Width="Auto"></ColumnDefinition>
      </Grid.ColumnDefinitions>

      <Label Grid.Row="0" Grid.Column="0" Margin="3" VerticalAlignment="Center">A</Label>
      <TextBox Grid.Row="0" Grid.Column="1" Margin="3" Height="Auto" VerticalAlignment="Center"></TextBox>
      <Button Grid.Row="0" Grid.Column="2" Margin="3" Padding="2">A</Button>
      <Label Grid.Row="1" Grid.Column="0" Margin="3" VerticalAlignment="Center">A</Label>
      <TextBox Grid.Row="1" Grid.Column="1" Margin="3" Height="Auto"  VerticalAlignment="Center"></TextBox>
      <Button Grid.Row="1" Grid.Column="2" Margin="3" Padding="2">B</Button>
      <Label Grid.Row="2" Grid.Column="0" Margin="3" VerticalAlignment="Center">B</Label>
      <TextBox Grid.Row="2" Grid.Column="1" Margin="3" Height="Auto"  VerticalAlignment="Center"></TextBox>
      <Button Grid.Row="2" Grid.Column="2" Margin="3" Padding="2">B</Button>
      <Label Grid.Row="3" Grid.Column="0" Margin="3" VerticalAlignment="Center">C</Label>
      <TextBox Grid.Row="3" Grid.Column="1" Margin="3" Height="Auto" VerticalAlignment="Center"></TextBox>
      <Button Grid.Row="3" Grid.Column="2" Margin="3" Padding="2">C</Button>
      <Label Grid.Row="4" Grid.Column="0" Margin="3" VerticalAlignment="Center">D</Label>
      <TextBox Grid.Row="4" Grid.Column="1" Margin="3" Height="Auto"  VerticalAlignment="Center"></TextBox>
      <Button Grid.Row="4" Grid.Column="2" Margin="3" Padding="2">D</Button>
      <Label Grid.Row="5" Grid.Column="0" Margin="3" VerticalAlignment="Center">E</Label>
      <TextBox Grid.Row="5" Grid.Column="1" Margin="3" Height="Auto"  VerticalAlignment="Center"></TextBox>
      <Button Grid.Row="5" Grid.Column="2" Margin="3" Padding="2">E</Button>
      <Label Grid.Row="6" Grid.Column="0" Margin="3" VerticalAlignment="Center">F:</Label>
      <TextBox Grid.Row="6" Grid.Column="1" Margin="3" Height="Auto" VerticalAlignment="Center"></TextBox>
      <Button Grid.Row="6" Grid.Column="2" Margin="3" Padding="2">B</Button>
      <Label Grid.Row="7" Grid.Column="0" Margin="3" VerticalAlignment="Center">S</Label>
      <TextBox Grid.Row="7" Grid.Column="1" Margin="3" Height="Auto"  VerticalAlignment="Center"></TextBox>
      <Button Grid.Row="7" Grid.Column="2" Margin="3" Padding="2">B</Button>
    </Grid>
  </ScrollViewer>
  </DockPanel>
</Window>

//File:Window.xaml.cs

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;

namespace Content
{
    public partial class ScrollableTextBoxColumn : System.Windows.Window
    {

        public ScrollableTextBoxColumn()
        {
            InitializeComponent();
        }

        private void LineUp(object sender, RoutedEventArgs e)
        {
            scroller.LineUp();
        }
        private void LineDown(object sender, RoutedEventArgs e)
        {
            scroller.LineDown();
        }
        private void PageUp(object sender, RoutedEventArgs e)
        {
            scroller.PageUp();
        }
        private void PageDown(object sender, RoutedEventArgs e)
        {
            scroller.PageDown();
        }
    }
}

TextBox Selection start, end and selected text

Posted on by coder 


   
  

<Window x:Class="ClassicControls.TextBoxTest"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="TextBoxTest" Height="325" Width="390">
  <Grid Margin="5">
    <Grid.RowDefinitions>
      <RowDefinition Height="2*"></RowDefinition>
      <RowDefinition Height="*"></RowDefinition>
    </Grid.RowDefinitions>
    <TextBox  Name="txt" VerticalScrollBarVisibility="Auto" TextWrapping="Wrap" AcceptsReturn="True"  
             SelectionChanged="txt_SelectionChanged"  
             SpellCheck.IsEnabled="True">this is a test</TextBox>
  </Grid>
</Window>

//File:Window.xaml.cs
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;

namespace ClassicControls
{
    public partial class TextBoxTest : System.Windows.Window
    {

        public TextBoxTest()
        {
            InitializeComponent();
        }

        private void txt_SelectionChanged(object sender, RoutedEventArgs e)
        {
            Console.WriteLine(txt.SelectionStart);
            Console.WriteLine(txt.SelectionLength);
            Console.WriteLine(txt.SelectedText);
        }
    }
}

Set TextBox ContextMenu to null

Posted on by coder 


   
  

<Window x:Class="Commands.NoCommandTextBox"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="NoCommandTextBox" Height="300" Width="300">
    <Grid>
      <TextBox Name="txt"/>
    </Grid>
</Window>
//File:Window.xaml.cs
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;

namespace Commands
{
    public partial class NoCommandTextBox : System.Windows.Window
    {
        public NoCommandTextBox()
        {
            InitializeComponent();           
        
            txt.ContextMenu = null;
        }
    }
}

Use Dictionary to record which textbox has been changed and not saved

Posted on by coder 


   
  
<Window x:Class="Commands.TwoDocument"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="TwoDocument" Height="300" Width="300">

  <Window.Resources>
    <CommandBinding x:Key="binding" Command="ApplicationCommands.Save" Executed="SaveCommand" CanExecute="SaveCommand_CanExecute" />
  </Window.Resources>

  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition Height="Auto"></RowDefinition>
      <RowDefinition Height="Auto"></RowDefinition>
      <RowDefinition></RowDefinition>
      <RowDefinition></RowDefinition>
    </Grid.RowDefinitions>
    <Menu Grid.Row="0">
      <MenuItem Header="File">
        <MenuItem Command="New"></MenuItem>
        <MenuItem Command="Open"></MenuItem>
        <MenuItem Command="Save"></MenuItem>
        <MenuItem Command="SaveAs"></MenuItem>
        <Separator></Separator>
        <MenuItem Command="Close"></MenuItem>
      </MenuItem>
    </Menu>

    <TextBox Margin="5" Grid.Row="2" TextWrapping="Wrap" AcceptsReturn="True" TextChanged="txt_TextChanged">
      <TextBox.CommandBindings>
        <StaticResource ResourceKey="binding"></StaticResource>
      </TextBox.CommandBindings>
      
    </TextBox>

  </Grid>
</Window>
//File:Window.xaml.cs
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;

namespace Commands
{
    public partial class TwoDocument : System.Windows.Window
    {
        Dictionary<Object, bool> isDirty = new Dictionary<Object, bool>();
        public TwoDocument()
        {
            InitializeComponent();
        }

        private void SaveCommand(object sender, ExecutedRoutedEventArgs e)
        {            
            string text = ((TextBox)sender).Text;
            isDirty[sender] = false;
        }
        private void txt_TextChanged(object sender, RoutedEventArgs e)
        {
            isDirty[sender] = true;
        }
        private void SaveCommand_CanExecute(object sender, CanExecuteRoutedEventArgs e)
        {
            if (isDirty.ContainsKey(sender) &amp;&amp; isDirty[sender] == true)
            {
                e.CanExecute = true;
            }
            else
            {
                e.CanExecute = false;
            }             
        }
    }
}

Scroll TextBox

Posted on by coder 


   
  

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF " Height="300" Width="300">
    <DockPanel LastChildFill="True">
        <TextBox DockPanel.Dock="Top" PreviewTextInput="TextBox_TextEvent"/>
        <TextBox Name="txtLog" HorizontalAlignment="Stretch" 
                 IsReadOnly="True" VerticalScrollBarVisibility="Visible"/>
    </DockPanel>
</Window>

//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Input;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void TextBox_TextEvent(object sender,TextCompositionEventArgs e)
        {
            String msg = String.Format("{0} - {1}
", e.RoutedEvent.Name, e.Text);

            txtLog.Text += msg;
            txtLog.ScrollToEnd();
        }
    }
}

TextBox PreviewTextInput

Posted on by coder 


   
  



<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF " Height="300" Width="300">
    <DockPanel LastChildFill="True">
        <TextBox DockPanel.Dock="Top" PreviewTextInput="TextBox_TextEvent"/>
        <TextBox Name="txtLog" HorizontalAlignment="Stretch" 
                 IsReadOnly="True" VerticalScrollBarVisibility="Visible"/>
    </DockPanel>
</Window>

//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Input;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void TextBox_TextEvent(object sender,TextCompositionEventArgs e)
        {
            String msg = String.Format("{0} - {1}
", e.RoutedEvent.Name, e.Text);

            txtLog.Text += msg;
            txtLog.ScrollToEnd();
        }
    }
}