public Scenario2()
{
this.InitializeComponent();
inkPresenter = inkCanvas.InkPresenter;
inkPresenter.StrokesCollected += InkPresenter_StrokesCollected;
inkPresenter.StrokesErased += InkPresenter_StrokesErased;
inkPresenter.StrokeInput.StrokeStarted += StrokeInput_StrokeStarted;
// We exclude CoreInputDeviceTypes.Touch because we use touch to select paragraphs.
inkPresenter.InputDeviceTypes = CoreInputDeviceTypes.Pen | CoreInputDeviceTypes.Mouse;
inkCanvas.Tapped += InkCanvas_Tapped;
inkCanvas.DoubleTapped += InkCanvas_DoubleTapped;
inkAnalyzer = new InkAnalyzer();
paragraphSelected = null;
dispatcherTimer = new DispatcherTimer();
dispatcherTimer.Tick += DispatcherTimer_Tick;
// We perform analysis when there has been a change to the
// ink presenter and the user has been idle for 1 second.
dispatcherTimer.Interval = TimeSpan.FromSeconds(1);
}
private string ExtractTextFromParagraph(InkAnalysisParagraph paragraph)
{
// The paragraph.RecognizedText property also returns the text,
// but manually walking through the lines allows us to preserve
// line breaks.
var lines = new List <string>();
foreach (var child in paragraph.Children)
{
if (child.Kind == InkAnalysisNodeKind.Line)
{
var line = (InkAnalysisLine)child;
lines.Add(line.RecognizedText);
}
else if (child.Kind == InkAnalysisNodeKind.ListItem)
{
var listItem = (InkAnalysisListItem)child;
lines.Add(listItem.RecognizedText);
}
}
return(String.Join("\n", lines));
}
private void InkCanvas_DoubleTapped(object sender, DoubleTappedRoutedEventArgs e)
{
// Convert the selected paragraph or list item
if (paragraphSelected != null)
{
Rect rect = paragraphSelected.BoundingRect;
var text = ExtractTextFromParagraph(paragraphSelected);
if ((rect.X > 0) && (rect.Y > 0) && (text != string.Empty))
{
// Create text box with recognized text
var textBlock = new TextBlock();
textBlock.Text = text;
textBlock.MaxWidth = rect.Width;
textBlock.MaxHeight = rect.Height;
Canvas.SetLeft(textBlock, rect.X);
Canvas.SetTop(textBlock, rect.Y);
// Remove strokes from InkPresenter
IReadOnlyList <uint> strokeIds = paragraphSelected.GetStrokeIds();
foreach (var strokeId in strokeIds)
{
var stroke = inkPresenter.StrokeContainer.GetStrokeById(strokeId);
stroke.Selected = true;
}
inkPresenter.StrokeContainer.DeleteSelected();
// Remove strokes from InkAnalyzer
inkAnalyzer.RemoveDataForStrokes(strokeIds);
// Hide the SelectionRect
SelectionRect.Visibility = Visibility.Collapsed;
canvas.Children.Add(textBlock);
paragraphSelected = null;
}
}
}
private void InkCanvas_Tapped(object sender, TappedRoutedEventArgs e)
{
var position = e.GetPosition(inkCanvas);
var paragraph = FindHitParagraph(position);
if (paragraph == null)
{
// Did not tap on a paragraph.
SelectionRect.Visibility = Visibility.Collapsed;
}
else
{
// Show the selection rect at the paragraph's bounding rect.
Rect rect = paragraph.BoundingRect;
SelectionRect.Width = rect.Width;
SelectionRect.Height = rect.Height;
Canvas.SetLeft(SelectionRect, rect.Left);
Canvas.SetTop(SelectionRect, rect.Top);
SelectionRect.Visibility = Visibility.Visible;
}
paragraphSelected = paragraph;
}
