/// <summary>
/// Pres the process wm key down_ back.
/// </summary>
/// <param name="m">The m.</param>
/// <returns></returns>
protected virtual bool PreProcessWmKeyDown_Back(ref Message m)
{
if (!HexViewer._byteProvider.SupportsDeleteBytes)
{
return(true);
}
long pos = HexViewer.bytePosition;
long sel = HexViewer._selectionLength;
int cp = HexViewer.byteCharacterPosition;
long startDelete = (cp == 0 && sel == 0) ? pos - 1 : pos;
if (startDelete < 0 && sel < 1)
{
return(true);
}
long bytesToDelete = (sel > 0) ? sel : 1;
HexViewer._byteProvider.DeleteBytes(Math.Max(0, startDelete), bytesToDelete);
HexViewer.UpdateScrollSize();
if (sel == 0)
{
PerformPosMoveLeftByte();
}
HexViewer.ReleaseSelection();
HexViewer.Invalidate();
return(true);
}