WinRT RichEditBox Limitations - winrt-xaml

Question

In Windows Store app (XAML/C#), I've created a custom control with 'RichEditBox' in it. I want to limit number of characters (MaxLength) for it or at least vertical scroll bar should be disabled. How can I achieve it?

Answer 1

I think it's not possible to set a limit for the number of characters in a declarative manner, but you may handle the text changed event and do your checks in code behind.
For the scroller you can set the ScrollViewer.VerticalScrollBarVisibility property to Disabled.

Answer 2

Here try this out:
<RichEditBox x:Name="TextElementControl"
Background="{Binding Background, ElementName=userControlModified}"
ManipulationMode="None"
ScrollViewer.HorizontalScrollMode="Disabled"
AcceptsReturn="True" TextWrapping="Wrap"
SizeChanged="TextElementControlSizeChanged"
IsDoubleTapEnabled="False"
BorderThickness="0"
BorderBrush="{x:Null}"
Padding="10,10,10,10"
/>
Code Behind:
TextElementControl.TextChanged += TextElementControlTextChanged;
More Code Behind:
private void TextElementControlTextChanged(object sender,
RoutedEventArgs e)
{
string str;
TextElementControl.Document.GetText(Windows.UI.Text.TextGetOptions.None,
out str);
TextElementControl.Height = double.NaN;
if (str.Trim().Length > 502 && !_loading)
{
if (popUpReminder == null)
{
popUpReminder = new Popup();
popUpReminder.IsLightDismissEnabled = true;
var panel = new StackPanel();
panel.Background = BlackSolidColorBrush;
panel.Height = 60;
panel.Width = 220;
var reminderText = new TextBlock();
reminderText.FontSize = 14;
reminderText.Text = "You have exceeded the maximum number of characters for this textbox.";
reminderText.TextWrapping = TextWrapping.Wrap;
reminderText.Focus(Windows.UI.Xaml.FocusState.Programmatic);
reminderText.Margin = new Thickness(10, 5, 10, 5);
panel.Children.Add(reminderText);
Border brder = new Border();
brder.BorderBrush = RedSolidColorBrush;
brder.BorderThickness = new Thickness(2);
brder.Child = panel;
popUpReminder.Child = brder;
popUpReminder.HorizontalOffset = Window.Current.CoreWindow.Bounds.Width - panel.Width - 10;
popUpReminder.VerticalOffset = Window.Current.CoreWindow.Bounds.Bottom - 100 - panel.Height - 10;
}
popUpReminder.IsOpen = true;
TextElementControl.Document.Undo();
} }