private void HandleMouseDownForTextSelection(MouseEventArgs e)
{
if (e.Button != MouseButtons.Left)
{
return;
}
var pdfLocation = PointToPdf(e.Location);
if (!pdfLocation.IsValid)
{
return;
}
var characterIndex = Document.GetCharacterIndexAtPosition(pdfLocation, 4f, 4f);
if (characterIndex >= 0)
{
_textSelectionState = new TextSelectionState()
{
StartPage = pdfLocation.Page,
StartIndex = characterIndex,
EndPage = -1,
EndIndex = -1
};
_isSelectingText = true;
Capture = true;
}
else
{
_isSelectingText = false;
Capture = false;
_textSelectionState = null;
}
}
public void Start(Point position, int pos, T content)
{
selectionStart = selectionEnd = pos;
State = TextSelectionState.Clicked;
selectionStartingPoint = position;
Content = content;
}
public void Set (int pos, Point position)
{
selectionEnd = pos;
if (State == TextSelectionState.Clicked && Away (selectionStartingPoint, position, SelectionDistancePixel)) {
State = TextSelectionState.Selecting;
}
}
public void SelectAll()
{
_textSelectionState = new TextSelectionState()
{
StartPage = 0,
StartIndex = 0,
EndPage = Document.PageCount - 1,
EndIndex = Document.CountCharacters(Document.PageCount - 1) - 1
};
Invalidate();
}
public void SelectCurrentPage()
{
_textSelectionState = new TextSelectionState()
{
StartPage = Page,
StartIndex = 0,
EndPage = Page,
EndIndex = Document.CountCharacters(Page) - 1
};
Invalidate();
}
private void DrawTextSelection(Graphics graphics, int page, TextSelectionState state)
{
if (state.EndPage < 0 || state.EndIndex < 0)
{
return;
}
if (page >= state.StartPage && page <= state.EndPage)
{
int start = 0, end = 0;
if (page == state.StartPage)
{
start = state.StartIndex;
}
if (page == state.EndPage)
{
end = (state.EndIndex + 1);
}
else
{
end = Document.CountCharacters(page);
}
Region region = null;
foreach (var rectangle in Document.GetTextRectangles(page, start, end - start))
{
if (region == null)
{
region = new Region(BoundsFromPdf(rectangle));
}
else
{
region.Union(BoundsFromPdf(rectangle));
}
}
if (region != null)
{
graphics.FillRegion(_textSelectionBrush, region);
}
}
}
public void ReloadDocument()
{
_maxWidth = 0;
_maxHeight = 0;
_textSelectionState = null;
foreach (var size in Document.PageSizes)
{
var translated = TranslateSize(size);
_maxWidth = Math.Max((int)translated.Width, _maxWidth);
_maxHeight = Math.Max((int)translated.Height, _maxHeight);
}
_documentScaleFactor = _maxHeight != 0 ? (double)_maxWidth / _maxHeight : 0D;
_markers = null;
UpdateScrollbars();
Invalidate();
}
private void HandleMouseDoubleClickForTextSelection(MouseEventArgs e)
{
var pdfLocation = PointToPdf(e.Location);
if (!pdfLocation.IsValid)
{
return;
}
if (Document.GetWordAtPosition(pdfLocation, 4f, 4f, out var word))
{
_textSelectionState = new TextSelectionState()
{
StartPage = pdfLocation.Page,
EndPage = pdfLocation.Page,
StartIndex = word.Offset,
EndIndex = word.Offset + word.Length
};
Invalidate();
}
}
public void Stop()
{
State = TextSelectionState.Selected;
}
