public void dispatch(TerrainCommand cmd)
{
if (cmd.execute(this) == true)
{
addUndo(cmd);
myTerrainSource.chunkCache.updateChunk(cmd.myChunk);
}
}
public void undoLastCommand()
{
if (myUndoStack.Count == 0)
{
return;
}
TerrainCommand cmd = myUndoStack.Last.Value;
myUndoStack.RemoveLast();
if (cmd.undo(this) == true)
{
myTerrainSource.chunkCache.updateChunk(cmd.myChunk);
}
}
public void addUndo(TerrainCommand cmd)
{
/* TODO: figure out a better way of commands to figure out if they actually need to be stored
* if (myUndoStack.Count > 0)
* {
* //check if this command has actually changes the chunk
* TerrainCommand prevCmd = myUndoStack.Last.Value;
*
* //could be the same
* if (cmd.myPreviousState.Length == prevCmd.myPreviousState.Length)
* {
* bool different = false;
* for (int i = 0; i < cmd.myPreviousState.Length; i++)
* {
* if (cmd.myPreviousState[i] != prevCmd.myPreviousState[i])
* {
* different = true;
* break;
* }
* }
*
* if (different == false)
* {
* //no sense in storing the same exact state twice
* return;
* }
* }
* }
*/
myUndoStack.AddLast(cmd);
while (undoUsage > 1024 * 1024 * 100) //more than 100 mb of undo memory used
{
myUndoStack.RemoveFirst();
}
}