Is it possible to change caret width for TextBox in silverlight when overwrite mode? - silverlight

Question

I have the TextBox in silverlight 4 in 2 modes: insert and overwrite.
Can anyone help me? If I press the overwrite mode, I want to make the caret blinking size bigger.
I have used to CaretBrush, but it can change the color of caret only.
Many thanks if you have suggestion or the sample code.

Answer 1

At the time looking someone can help, I tried this solution for myself, It's abit complex, but I hope someone can use my code and customize yourself. Someone can get this code for trying if you have this case
The MainPage.xaml code:
<UserControl x:Class="SilverlightApplication1.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.micros`enter code here`oft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">
<Grid Name="LayoutRoot">
<Canvas x:Name="canvasDataView" VerticalAlignment="Top" Background="White" HorizontalAlignment="Left">
<TextBox HorizontalAlignment="Left" Canvas.Left="50" VerticalAlignment="Top" x:Name="positionTextBox" Canvas.ZIndex="2" Text="position" Canvas.Top="25" Visibility="Collapsed" Width="100" Height="25"></TextBox>
<TextBox x:Name="textBox1" Text="asdfasdfasd asda asdf as adfasdfads adf asdf adfasdf" SelectionForeground="AliceBlue" KeyDown="textBox1_KeyDown" KeyUp="textBox1_KeyUp" TextWrapping="NoWrap" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Visible" AcceptsReturn="True" Height="25" Width="500" />
<TextBox x:Name="shadowTextBox" Canvas.ZIndex="-1" Canvas.Left="350" Height="20" Width="20" HorizontalScrollBarVisibility="Visible" AcceptsReturn="True" VerticalScrollBarVisibility="Visible" Visibility="Visible" TextWrapping="NoWrap"/>
</Canvas>
</Grid>
</UserControl>
The code behind:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Expression.Interactivity;
using System.Windows.Controls.Primitives;
namespace SilverlightApplication1
{
public partial class MainPage : UserControl
{
Duration duration = new Duration(TimeSpan.FromSeconds(0.5));
Storyboard storybroad = new Storyboard();
Rectangle myRectangle = null;
ScrollViewer sv;
public MainPage()
{
InitializeComponent();
textBox1.KeyUp += new KeyEventHandler(textBox1_KeyUp);
textBox1.TextChanged += new TextChangedEventHandler(textBox1_TextChanged);
textBox1.CaretBrush = new SolidColorBrush(Colors.Transparent);
}
void textBox1_TextChanged(object sender, TextChangedEventArgs e)
{
shadowTextBox.Text = textBox1.Text;
shadowTextBox.SelectionStart = textBox1.SelectionStart;
Point p = getCaretPosition(textBox1, shadowTextBox);
MoveCaret(p);
}
void textBox1_KeyDown(object sender, KeyEventArgs e)
{
shadowTextBox.Text = textBox1.Text;
shadowTextBox.SelectionStart = textBox1.SelectionStart;
}
void textBox1_KeyUp(object sender, KeyEventArgs e)
{
shadowTextBox.Text = textBox1.Text;
shadowTextBox.SelectionStart = textBox1.SelectionStart;
// get caret position
Point p = getCaretPosition(textBox1,shadowTextBox);
MoveCaret(p);
}
private Point getCaretPosition(TextBox textBox, TextBox shadowTextBox)
{
Point _point = new Point();
// get main textbox's scroll offset, if any
getScrollBar(textBox);
double initVerticalOffset = sv.VerticalOffset;
double initHorizontalOffset = sv.HorizontalOffset;
// get shadow box scroll offset
getScrollBar(shadowTextBox);
double vOffset = sv.VerticalOffset;
double hOffset = sv.HorizontalOffset;
// caret position is scroll offset of shadaw minus scroll offset of main (if any)
_point.Y = vOffset - initVerticalOffset;
_point.X = hOffset - initHorizontalOffset;
return _point;
}
private void getScrollBar(UIElement src)
{
// walk visual tree for this object until we get the scrollviewer
if (src.GetType().ToString() == "System.Windows.Controls.ScrollViewer")
sv = src as ScrollViewer;
else
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(src); i++)
{
UIElement elem = (UIElement)VisualTreeHelper.GetChild(src, i);
getScrollBar(elem);
}
}
}
void MoveCaret(Point point)
{
if (storybroad == null)
storybroad = new Storyboard();
storybroad.Stop();
if (point != new Point(0, 0))
{
if (myRectangle != null && canvasDataView.Children.Contains(myRectangle))
{
canvasDataView.Children.Remove(myRectangle);
}
myRectangle = new Rectangle();
myRectangle.SetValue(Canvas.TopProperty, point.Y);
myRectangle.SetValue(Canvas.LeftProperty, point.X);
myRectangle.Width = 5;
myRectangle.Height = 16;
myRectangle.Fill = new SolidColorBrush();
storybroad.BeginTime = new TimeSpan(0, 0, 0, 0, 0);
storybroad.RepeatBehavior = RepeatBehavior.Forever;
ColorAnimation color = new ColorAnimation();
canvasDataView.Children.Add(myRectangle);
color.From = Colors.Transparent;
color.To = Colors.Green;
color.Duration = duration;
storybroad.Children.Add(color);
Storyboard.SetTarget(color, myRectangle);
Storyboard.SetTargetProperty(color, new PropertyPath("(Fill).(SolidColorBrush.Color)"));
storybroad.Begin();
}
}
}
}