/*
* When Redo is clicked: pop redo_stack and add it back to the Shapes List
*/
private void redoButton_Click(object sender, EventArgs e)
{
if (redo_stack.Count > 0)
{
ShapeAction ra = redo_stack.Pop();
if (ra.TypeOfAction == "Erase")
{
ShapesDict.Remove(ra.Key);
Actions.Add(ra);
}
else if (ra.TypeOfAction == "Resize" || ra.TypeOfAction == "Move")
{
Actions.Add(new ShapeAction(ra.TypeOfAction, ra.Key, ShapesDict[ra.Key]));
ShapesDict[ra.Key] = ra.Shape;
}
else if (ra.TypeOfAction == "Draw")
{
ShapesDict.Add(ra.Key, ra.Shape);
//add ra (popped object from redo_stack) back to Actions List
Actions.Add(ra);
}
}
drawing_panel.Invalidate();
}
/*
* When Undo is clicked, remove the last shape added to the Shapes List
* and push it onto the redo_stack.
*
* TODO: Handle if 'Clear All' was clicked previously.
*/
private void undo_button_Click(object sender, EventArgs e)
{
// check if there are any actions to undo
if (Actions.Count > 0)
{
//lookup last action
ShapeAction lastAction = Actions.Last();
// if last action was an Draw then remove shape from dict to undo the "Draw" Action
if (lastAction.TypeOfAction == "Draw")
{
//save last action to a redo stack
redo_stack.Push(lastAction);
ShapesDict.Remove(lastAction.Key);
}
else if (lastAction.TypeOfAction == "Resize" || lastAction.TypeOfAction == "Move")
{
//store initial size of shape in redo_stack
redo_stack.Push(new ShapeAction("Resize", lastAction.Key, ShapesDict[lastAction.Key]));
//set shape back to size stored in lastAction
ShapesDict[lastAction.Key] = lastAction.Shape;
}
else if (lastAction.TypeOfAction == "Erase")
{// else revert ShapesDict back to the state that lastAction saved
ShapesDict[lastAction.Key] = lastAction.Shape;
//save last action to a redo stack
redo_stack.Push(lastAction);
}
//pop last action from actions list
Actions.RemoveAt(Actions.Count - 1);
} // Add all shapes from the clear_all_stack back into the dict
//else if(just_cleared)
//{
// foreach(IShape shape in clear_all_stack)
// {
// //Shapes.Add(shape);
// ShapesDict.Add(++shapeCount, shape);
// }
// just_cleared = false;
//}
drawing_panel.Invalidate();
}
