protected override async Task<string> ReadTextCoreAsync(int maxChars)
{
AssertIsForeground();
var inputTextBox = new TextBox
{
FontFamily = normalFontFamily,
FontSize = this.FontSize,
Padding = new Thickness(0.0),
Margin = new Thickness(0.0),
BorderBrush = Brushes.Transparent,
BorderThickness = new Thickness(0.0),
Background = Brushes.WhiteSmoke,
MaxLength = maxChars
};
var scrollContext = this.scrollViewer.FindFirstVisualChild<ScrollContentPresenter>();
var lastCharacterRect = this.document.ContentEnd.GetCharacterRect(LogicalDirection.Forward);
var minWidth = scrollContext.ActualHeight - this.document.PagePadding.Right - lastCharacterRect.Right;
inputTextBox.MinWidth = Math.Max(minWidth, 0);
var container = new InlineUIContainer(inputTextBox, this.document.ContentEnd)
{
BaselineAlignment = BaselineAlignment.TextBottom
};
this.paragraph.Inlines.Add(container);
if (!inputTextBox.Focus())
{
inputTextBox.PostAction(() => inputTextBox.Focus());
}
string text = null;
while (text == null)
{
var args = await inputTextBox.KeyUpAsync();
if (args.Key == Key.Return)
{
text = inputTextBox.Text;
}
}
this.paragraph.Inlines.Remove(container);
PutText(text + "\r\n", forceFixedWidthFont: false);
return text;
}