private void ParseKeyStrokes(DataSet dsCollector)
{
CharStream = "";
DataTable dtCollector = dsCollector.Tables[0];
string sampleId = dsCollector.Tables[0].Rows[0].Field<string>("SampleId");
string securityId = dsCollector.Tables[0].Rows[0].Field<string>("SecurityId");
StringBuilder output = new StringBuilder();
int startIndexOffset = 0, cursorPosition = 0;
byte shiftDown = 0;
SelectionBounds selection = new SelectionBounds();
// Extract individual key strokes from each row
for (int i = 0; i < dtCollector.Rows.Count; i++)
{
DataRow row = dtCollector.Rows[i];
int eve = Convert.ToInt16(row["KeyEvent"]);
long when = Convert.ToInt64(row["AbsoluteTimestamp"]);
int vkCode = Convert.ToInt32(row["VkCode"]);
char keyChar = VkCodeToChar(vkCode, shiftDown != 0);
if (keyChar != 65535 && eve == 1)
CharStream += keyChar;
if (eve == 1)
{
if (vkCode == 8 || vkCode == 25)
cursorPosition--;
else
cursorPosition++;
if (cursorPosition < 0)
cursorPosition = 0;
}
KeyStroke key;
key.isKeyPress = eve == 1;
key.keyChar = keyChar;
key.keyCode = vkCode;
key.timestamp = when;
key.cursorPosition = cursorPosition;
shiftDown = ProcessKeyStroke(output, startIndexOffset, shiftDown, selection, key);
}
FinalText = output.ToString();
}
private static byte ProcessKeyStroke(StringBuilder output, int startIndexOffset, byte shiftDown, SelectionBounds selection, KeyStroke k)
{
int relativeIndex = k.cursorPosition - startIndexOffset;
if (relativeIndex < 0)
relativeIndex = 0;
if (k.isKeyPress)
{
switch (k.keyCode)
{
case VK_BACK: // Backspace
if (relativeIndex == 0)
{
break;
}
if(output.Length > 0)
{
if (!selection.isEmpty())
{
if (selection.start < 0)
selection.start = 0;
else if (selection.start >= output.Length)
selection.start = output.Length - 1;
if (selection.end < 0)
selection.end = 0;
else if (selection.end >= output.Length)
selection.end = output.Length - 1;
selection.checkOrder();
output.Remove(selection.start, selection.end - selection.start);
selection.start = selection.end = -1;
}
else
{
if (relativeIndex > output.Length - 1)
relativeIndex = output.Length - 1;
output.Remove(relativeIndex, 1);
}
}
break;
case VK_SHIFT:
shiftDown |= 0x04;
if (selection.isActive())
{ // There is already an active
// selection -- hitting select again
// shouldn't change anything
break;
}
// selection
selection.start = relativeIndex;
selection.end = relativeIndex;
break;
case VK_LSHIFT:
shiftDown |= 0x02;
if (selection.isActive())
{ // There is already an active
// selection -- hitting select again
// shouldn't change anything
break;
}
// selection
selection.start = relativeIndex;
selection.end = relativeIndex;
break;
case VK_RSHIFT: // Shift
shiftDown |= 0x01;
if (selection.isActive())
{ // There is already an active
// selection -- hitting select again
// shouldn't change anything
break;
}
// selection
selection.start = relativeIndex;
selection.end = relativeIndex;
break;
case VK_DELETE: // Delete
if (relativeIndex > output.Length - 1)
{
break;
}
if (!selection.isEmpty())
{
selection.checkOrder();
output.Remove(selection.start, selection.end - selection.start);
}
else
{
output.Remove(relativeIndex, 1);
}
selection.start = selection.end = -1;
break;
case VK_LEFT: // 37: // Arrows
if (shiftDown == 0)
{
// clear the selection, if not currently shifting.
selection.start = selection.end = -1;
}
else if (selection.isActive())
{
selection.end = relativeIndex - 1;
}
break;
case VK_RIGHT: // 39:
if (shiftDown == 0)
{
// clear the selection, if not currently shifting.
selection.start = selection.end = -1;
}
else if (selection.isActive())
{
selection.end = relativeIndex + 1;
}
break;
case 38:
case 40:
if (shiftDown == 0)
{
// clear the selection, if not currently shifting.
selection.start = selection.end = -1;
}
else if (selection.isActive())
{
selection.end = relativeIndex;
}
break;
default:
if (k.keyChar == 65535)
{
break;
}
if (k.keyChar < 9) // nonprinted
{
break;
}
if (k.keyChar > 11 && k.keyChar < 13)
{
break;
}
if (k.keyChar > 13 && k.keyChar < 32)
{
break;
}
// Printable characters
if (selection.isActive() && !selection.isEmpty())
{
selection.checkOrder();
if (selection.start < output.Length)
{
if (selection.end < output.Length)
output.Remove(selection.start, selection.end - selection.start);
else
output.Remove(selection.start, output.Length - selection.start);
}
}
if (relativeIndex < 0)
{
relativeIndex = 0;
}
if (relativeIndex > output.Length)
{
relativeIndex = output.Length;
}
output.Insert(relativeIndex, k.keyChar);
// After a printed character the selection is cleared.
selection.start = selection.end = -1;
break;
}
}
else
{
if (k.keyCode == VK_LSHIFT)
{
shiftDown &= 0xFD;
}
else if (k.keyCode == VK_SHIFT)
{
shiftDown &= 0xFB;
}
else if (k.keyCode == VK_RSHIFT)
{
shiftDown &= 0xFE;
}
}
return shiftDown;
}
