void UpdateCaptureMouseSelection(ulong? startOffset, HexBoxPosition position, HexPositionUI uiPos)
{
SetCaretPosition(position);
if (startOffset == null)
return;
if (Selection != null || uiPos != mouseCaptureStartPosUI)
Selection = new HexSelection(startOffset.Value, position.Offset);
}
ulong GetLineOffset(HexPositionUI docPos)
{
ulong bpl = (ulong)(visibleBytesPerLine == 0 ? 1 : visibleBytesPerLine);
return NumberUtils.AddUInt64(StartOffset, NumberUtils.MulUInt64(docPos.Y, bpl));
}
HexBoxPosition? GetPositionFrom(HexPositionUI docPos, double xpos)
{
ulong lineOffset = GetLineOffset(docPos);
int hexByteCharIndex;
ulong? hexByteIndex = TryGetHexByteLineIndex(docPos.X, xpos, out hexByteCharIndex);
if (hexByteIndex != null)
return HexBoxPosition.CreateByte(NumberUtils.AddUInt64(lineOffset, hexByteIndex.Value), hexByteCharIndex);
ulong? asciiIndex = TryGetAsciiLineIndex(docPos.X);
if (asciiIndex != null)
return HexBoxPosition.CreateAscii(NumberUtils.AddUInt64(lineOffset, asciiIndex.Value));
return null;
}
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
var pos = GetPositionFrom(e);
if (pos != null) {
if ((Keyboard.Modifiers & ModifierKeys.Shift) != 0)
SelectText(() => SetCaretPosition(pos.Value));
else
UnselectText(() => SetCaretPosition(pos.Value));
if (CaptureMouse()) {
mouseCaptureActive = true;
mouseCaptureStartPos = Selection == null ? pos.Value.Offset : Selection.Value.From;
mouseCaptureStartPosUI = GetDocumentPositionFromMousePosition(e.GetPosition(this));
}
Focus();
e.Handled = true;
return;
}
base.OnMouseLeftButtonDown(e);
}
