internal void saveCommand(Command cmd, FlowChart flowChart)
{
if (maxDepth == 0 || !flowChart.confirmRecordAction(cmd))
{
cmd.freeUndoResources();
return;
}
if (currCmd < commands.Count - 1)
{
for (int i = currCmd + 1; i < commands.Count; ++i)
commands[i].freeRedoResources();
commands.RemoveRange(currCmd + 1, commands.Count - currCmd - 1);
}
commands.Add(cmd);
currCmd++;
if (commands.Count > maxDepth)
{
commands[0].freeUndoResources();
commands.RemoveAt(0);
currCmd--;
}
flowChart.fireActionRecorded(cmd);
}
internal void executeCommand(Command cmd)
{
if (cmd == null) return;
// just execute the action if no later undo is needed
if (!undoEnabled)
{
cmd.setContext(defaultCmdContext);
cmd.Execute(false);
cmd.freeUndoResources();
return;
}
// if executing the ChangeItem comand on table, clear last reference
if (cmd == currChangeTableCmd)
currChangeTableCmd = null;
// if redimensioning a table, handle arrow removals
RemoveItemCmd removeItemCmd = cmd as RemoveItemCmd;
if (currRedimCmd != null && cmd != currRedimCmd &&
removeItemCmd != null)
{
if (removeItemCmd.getItem() is Arrow)
{
Arrow arr = (Arrow)removeItemCmd.getItem();
if (arr.Origin == currRedimCmd.getItem() ||
arr.Destination == currRedimCmd.getItem())
{
cmd.setContext(defaultCmdContext);
cmd.Execute(true);
currRedimCmd.AddSubCmd(cmd);
return;
}
}
}
// handle current composite command
if (currCompositeCmd != null)
{
if (cmd == currCompositeCmd)
{
history.saveCommand(currCompositeCmd, document);
currCompositeCmd = null;
return;
}
else
{
cmd.setContext(defaultCmdContext);
cmd.Execute(true);
currCompositeCmd.AddSubCmd(cmd);
return;
}
}
// create a single composite command for modify or remove commands
// that lead to modification or removal of more items
if (currCommand == null)
{
currCommand = cmd;
cmd.setContext(defaultCmdContext);
cmd.Execute(true);
history.saveCommand(cmd, document);
currCommand = null;
}
else
{
cmd.setContext(defaultCmdContext);
cmd.Execute(true);
currCommand.AddSubCmd(cmd);
}
}