/// <summary>
/// Paints the transition.
/// </summary>
/// <param name="graphics"><see cref="Graphics"/> instance for painting.</param>
public void Paint(Graphics graphics)
{
// paint background
StateView.DrawingTools.SolidBrush.Color = ColorSettings.StateTransition;
graphics.FillRectangle(StateView.DrawingTools.SolidBrush, Bounds);
// paint border
StateView.DrawingTools.Pen.Color = ColorSettings.ForState(StateView.SelectState, StateView.StartingState);
graphics.DrawRectangle(StateView.DrawingTools.Pen, Bounds);
// paint event text
StateView.DrawingTools.SolidBrush.Color = ColorSettings.StateTransitionText;
graphics.DrawString(Transition.Event != null ? Transition.Event.Name : String.Empty, StateView.DrawingTools.Font, StateView.DrawingTools.SolidBrush, textLocation);
// paint transition
if (Transition.StateTo != null)
{
StateView stateToView = StateView.ScreenControl.FindStateViewForState(Transition.StateTo);
if (stateToView != null)
{
PointF startingPoint, afterStartingPoint, afterStartingPointBezier;
PointF endingPoint, beforeEndingPointBezier;
float bezierWidthGap = 80;
float afterStartWidthGap = 40;
// right side of the transition
if ((stateToView.Location.X + stateToView.Bounds.Width / 2f) - (Location.X + Bounds.Width / 2f) >= 0)
{
startingPoint = new PointF(Location.X + Bounds.Width, Location.Y + Bounds.Height / 2f);
afterStartingPoint = new PointF(startingPoint.X + afterStartWidthGap, startingPoint.Y);
afterStartingPointBezier = new PointF(startingPoint.X + bezierWidthGap, startingPoint.Y);
}
// left side of the transition
else
{
startingPoint = new PointF(Location.X, Location.Y + Bounds.Height / 2f);
afterStartingPoint = new PointF(startingPoint.X - afterStartWidthGap, startingPoint.Y);
afterStartingPointBezier = new PointF(startingPoint.X - bezierWidthGap, startingPoint.Y);
}
// left side of the state
if (Math.Abs(stateToView.Location.X - afterStartingPoint.X) < Math.Abs(stateToView.Location.X + stateToView.Bounds.Width - afterStartingPoint.X))
{
endingPoint = new PointF(stateToView.Location.X, stateToView.Location.Y + stateToView.TitleHeight / 2f);
beforeEndingPointBezier = new PointF(endingPoint.X - bezierWidthGap, endingPoint.Y);
}
// right side of the state
else
{
endingPoint = new PointF(stateToView.Location.X + stateToView.Bounds.Width, stateToView.Location.Y + stateToView.TitleHeight / 2f);
beforeEndingPointBezier = new PointF(endingPoint.X + bezierWidthGap, endingPoint.Y);
}
graphics.DrawBezier(StateView.DrawingTools.LinePen, startingPoint, afterStartingPointBezier, beforeEndingPointBezier, endingPoint);
}
}
}
/// <summary>
/// Handles the KeyDown event of the StateMachineView control.
/// </summary>
private void StateMachineView_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Delete && state == StateType.Default && SelectedState != null)
{
if (StateMachine.States.Count <= 1)
{
Messages.ShowWarning("State cannot be removed. At least one state must exist.");
return;
}
if (MessageBox.Show("Are you sure?", "Delete State", MessageBoxButtons.OKCancel) == DialogResult.OK)
{
// remove state from all transitions
foreach (State stateMachineState in StateMachine.States)
{
if (stateMachineState != SelectedState.State)
{
foreach (Transition transition in stateMachineState.Transitions)
{
if (transition.StateTo == SelectedState.State)
{
transition.StateTo = null;
}
}
}
}
// remove from state machine
StateMachine.States.Remove(SelectedState.State);
if (StateMachine.StartingState == SelectedState.State)
{
StateMachine.StartingState = null;
}
States.Remove(SelectedState);
SelectedState.Dispose();
SelectedState = States[0];
if (SelectedStateChanged != null)
{
SelectedStateChanged(this, EventArgs.Empty);
}
Messages.ShowInfo("State deleted.");
if (AfterDeletingState != null)
{
AfterDeletingState(this, EventArgs.Empty);
}
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="TransitionView"/> class.
/// </summary>
/// <param name="stateView">The state view where will be the transition used.</param>
/// <param name="transition">The transition to use.</param>
public TransitionView(StateView stateView, Transition transition)
{
if (stateView == null)
{
throw new ArgumentException("StateView cannot be null.");
}
if (transition == null)
{
throw new ArgumentException("Transition cannot be null.");
}
_stateView = stateView;
_transition = transition;
Transition.EventChanged += new EventHandler(Transition_EventChanged);
Transition.StateToChanged += new EventHandler(Transition_StateToChanged);
Event = transition.Event;
}
/// <summary>
/// Handles the NameChanged event of the Event.
/// Updates the state view where the transition is used.
/// </summary>
private void Event_NameChanged(object sender, EventArgs e)
{
StateView.Refresh();
}
/// <summary>
/// Handles the MouseMove event of the StateMachineView control.
/// </summary>
private void StateMachineView_MouseMove(object sender, MouseEventArgs e)
{
// select control if is not focused
if (!Focused)
{
Select();
}
// update mouse scene position
mouseScenePosition = PointAtScene(e.Location);
// If the action of moving selected nodes at the scripting scene is active
// we will change the location of selected nodes by distance we moved from the last changing.
if (state == StateType.MovingState)
{
// calculate move vector for selected nodes at the scene
Point moveVector = e.Location.Sub(lastPosition);
// change the location of every selected nodes at the scene
SelectedState.Location = SelectedState.Location.Add(moveVector);
// set actual position for the next changing
lastPosition = e.Location;
wholeMovement = wholeMovement.Add(moveVector);
Invalidate();
}
// If the action of changing the position of the scripting scene is active
// we will change the position of the scene by distance we moved from the last changing.
else if (state == StateType.MovingScene)
{
// change the position of the scene
Position = Position.Add(lastPosition.Sub(e.Location));
// set actual position for the next changing
lastPosition = e.Location;
Invalidate();
}
else if (state == StateType.Default || state == StateType.ConnectingStates)
{
// hover state under mouse cursor
bool found = false;
for (int i = States.Count - 1; i >= 0; --i)
{
if (States[i].Bounds.Contains(mouseScenePosition))
{
if (hoveredState != States[i])
{
if (hoveredState != null && hoveredState.SelectState != SelectState.Select)
{
hoveredState.SelectState = SelectState.Default;
}
// set as hovered
hoveredState = States[i];
if (hoveredState.SelectState != SelectState.Select)
{
hoveredState.SelectState = SelectState.Hover;
}
Invalidate();
}
found = true;
break;
}
}
if (!found && hoveredState != null)
{
if (hoveredState.SelectState != SelectState.Select)
{
hoveredState.SelectState = SelectState.Default;
}
hoveredState = null;
Invalidate();
}
if (state == StateType.ConnectingStates)
{
Invalidate();
}
}
}
/// <summary>
/// Handles the MouseDown event of the StateMachineView control.
/// </summary>
private void StateMachineView_MouseDown(object sender, MouseEventArgs e)
{
// focus control if is not focused
if (!Focused)
{
Focus();
}
// If left mouse button is down, no action is in progress and some node is under mouse cursor
// we will start the action of moving selected nodes at the scripting scene.
if (e.Button == MouseButtons.Left && state == StateType.Default)
{
if (SelectedState != null)
{
SelectedState.SelectState = SelectState.Default;
}
if (hoveredState != null)
{
SelectedState = hoveredState;
SelectedState.SelectState = SelectState.Select;
hoveredState = null;
if (SelectedState.TransitionContains(mouseScenePosition, out selectedTransition))
{
// activate this action
state = StateType.ConnectingStates;
}
else
{
// activate this action
state = StateType.MovingState;
// init
lastPosition = e.Location;
wholeMovement = new Point();
}
if (SelectedStateChanged != null)
{
SelectedStateChanged(this, EventArgs.Empty);
}
Invalidate();
}
else if (SelectedState != null)
{
SelectedState = null;
if (SelectedStateChanged != null)
{
SelectedStateChanged(this, EventArgs.Empty);
}
Invalidate();
}
}
// If right mouse button is down and no action is in progress
// we will start changing the position of the scripting scene (moving scene).
else if (e.Button == MouseButtons.Right && state == StateType.Default)
{
// activate this action
state = StateType.MovingScene;
// init
lastPosition = e.Location;
}
}
/// <summary>
/// Handles the EventChanged event of the Transition.
/// Updates the state view where the transition is used.
/// </summary>
private void Transition_EventChanged(object sender, EventArgs e)
{
Event = Transition.Event;
StateView.Refresh();
}
/// <summary>
/// Handles the StateToChanged event of the Transition.
/// Updates the state view where the transition is used.
/// </summary>
private void Transition_StateToChanged(object sender, EventArgs e)
{
StateView.Refresh();
}