public static bool GetSelectionIndicesForPage(
uint pageNumber,
SelectionMarker selectionStart,
SelectionMarker selectionEnd,
out uint selectionStartIndex,
out uint selectionEndIndex)
{
if (selectionStart > selectionEnd)
{
var tmp = selectionStart;
selectionStart = selectionEnd;
selectionEnd = tmp;
}
selectionStartIndex = 0;
selectionEndIndex = 0;
if (selectionStart.PageNumber < pageNumber)
{
selectionStartIndex = 0;
}
else if (selectionStart.PageNumber == pageNumber)
{
selectionStartIndex = selectionStart.Index;
}
else
{
return(false);
}
if (selectionEnd.PageNumber > pageNumber)
{
selectionEndIndex = uint.MaxValue;
}
else if (selectionEnd.PageNumber == pageNumber)
{
selectionEndIndex = selectionEnd.Index;
}
else
{
return(false);
}
return(true);
}
private void PageViewControl_OnPointerPressed(object sender, PointerRoutedEventArgs e)
{
if (_pageViewObserver == null ||
e.Pointer.PointerDeviceType != PointerDeviceType.Mouse ||
!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
{
return;
}
_pageViewObserver.IsSelected = false;
_pageViewObserver.RaiseSelectionChanging();
RaiseSelectionChanged();
var pageViewControl = VisualTreeHelper
.FindElementsInHostCoordinates(e.GetCurrentPoint(null).Position, this, true)
.OfType <TextLayerControl>()
.FirstOrDefault();
if (pageViewControl?.TextLayer == null)
{
return;
}
var startingZone = pageViewControl.FindWordAtPoint(pageViewControl.TextLayer, e.GetCurrentPoint(pageViewControl).Position);
if (startingZone == null)
{
return;
}
if (_scrollViewer.CapturePointer(e.Pointer))
{
var selectionStart = new SelectionMarker(pageViewControl.State.PageNumber, startingZone.StartIndex);
_pageViewObserver.SelectionStart = selectionStart;
_pageViewObserver.SelectionEnd = selectionStart;
_scrollViewer.PointerMoved += PageViewControl_OnPointerMoved;
_scrollViewer.PointerReleased += PageViewControl_OnPointerReleased;
_scrollViewer.PointerCanceled += PageViewControl_OnPointerReleased;
_scrollViewer.PointerCaptureLost += PageViewControl_OnPointerReleased;
}
}
private async Task <SelectionInterval> FindOnPage(uint pageNumber, string query, SelectionMarker minPosition)
{
var textLayer = await Source.GetTextLayerAsync(pageNumber);
if (textLayer == null)
{
return(null);
}
var searchResults = SearchHelper.Search(new[] { textLayer }, query);
foreach (var zones in searchResults)
{
var zoneStart = new SelectionMarker(pageNumber, zones.First().StartIndex);
var zoneEnd = new SelectionMarker(pageNumber, zones.Last().EndIndex);
if (zoneStart > minPosition)
{
return(new SelectionInterval(zoneStart, zoneEnd));
}
}
return(null);
}
public SelectionInterval(SelectionMarker start, SelectionMarker end)
{
Start = start;
End = end;
}
