private bool handleMouseMove(InputState state)
{
return(positionalInputQueue.Any(target => target.TriggerOnMouseMove(state)));
}
protected virtual void TransformState(InputState inputState)
{
}
private void updateMouseEvents(InputState state)
{
MouseState mouse = (MouseState)state.Mouse;
var last = state.Last?.Mouse as MouseState;
if (last == null)
{
return;
}
if (mouse.Position != last.Position)
{
handleMouseMove(state);
if (isDragging)
{
handleMouseDrag(state);
}
}
for (MouseButton b = 0; b < MouseButton.LastButton; b++)
{
var lastPressed = last.IsPressed(b);
if (lastPressed != mouse.IsPressed(b))
{
if (lastPressed)
{
handleMouseUp(state, b);
}
else
{
handleMouseDown(state, b);
}
}
}
if (mouse.WheelDelta != 0)
{
handleWheel(state);
}
if (mouse.HasAnyButtonPressed)
{
if (!last.HasAnyButtonPressed)
{
//stuff which only happens once after the mousedown state
mouse.PositionMouseDown = state.Mouse.Position;
LastActionTime = Time.Current;
if (mouse.IsPressed(MouseButton.Left))
{
isValidClick = true;
if (Time.Current - lastClickTime < double_click_time)
{
if (handleMouseDoubleClick(state))
{
//when we handle a double-click we want to block a normal click from firing.
isValidClick = false;
}
lastClickTime = 0;
}
lastClickTime = Time.Current;
}
}
if (!isDragging && Vector2Extensions.Distance(mouse.PositionMouseDown ?? mouse.Position, mouse.Position) > drag_start_distance)
{
isDragging = true;
handleMouseDragStart(state);
}
}
else if (last.HasAnyButtonPressed)
{
if (isValidClick && (DraggedDrawable == null || Vector2Extensions.Distance(mouse.PositionMouseDown ?? mouse.Position, mouse.Position) < click_drag_distance))
{
handleMouseClick(state);
}
mouseDownInputQueue = null;
mouse.PositionMouseDown = null;
isValidClick = false;
if (isDragging)
{
isDragging = false;
handleMouseDragEnd(state);
}
}
}
private bool handleMouseMove(InputState state)
{
return(mouseInputQueue.Any(target => target.TriggerMouseMove(state)));
}
/// <summary>
/// In order to provide a reliable event system to drawables, we want to ensure that we reprocess input queues (via the
/// main loop in<see cref="updateInputQueues(InputState)"/> after each and every button or key change. This allows
/// correct behaviour in a case where the input queues change based on triggered by a button or key.
/// </summary>
/// <param name="states">A list of <see cref="InputState"/>s</param>
/// <returns>Processed states such that at most one button change occurs between any two consecutive states.</returns>
private IEnumerable <InputState> createDistinctInputStates(List <InputState> states)
{
InputState last = CurrentState;
foreach (var i in states)
{
//first we want to create a copy of ourselves without any button changes
//we do this by updating our buttons to the state of the last frame.
var iWithoutButtons = i.Clone();
var iHasMouse = iWithoutButtons.Mouse != null;
var iHasKeyboard = iWithoutButtons.Keyboard != null;
if (iHasMouse)
{
for (MouseButton b = 0; b < MouseButton.LastButton; b++)
{
iWithoutButtons.Mouse.SetPressed(b, last.Mouse?.IsPressed(b) ?? false);
}
}
if (iHasKeyboard)
{
iWithoutButtons.Keyboard.Keys = last.Keyboard?.Keys ?? new Key[] { }
}
;
//we start by adding this state to the processed list...
yield return(iWithoutButtons);
last = iWithoutButtons;
//and then iterate over each button/key change, adding intermediate states along the way.
if (iHasMouse)
{
for (MouseButton b = 0; b < MouseButton.LastButton; b++)
{
if (i.Mouse.IsPressed(b) != (last.Mouse?.IsPressed(b) ?? false))
{
var intermediateState = last.Clone();
if (intermediateState.Mouse == null)
{
intermediateState.Mouse = new MouseState();
}
//add our single local change
intermediateState.Mouse.SetPressed(b, i.Mouse.IsPressed(b));
last = intermediateState;
yield return(intermediateState);
}
}
}
if (iHasKeyboard)
{
foreach (var releasedKey in last.Keyboard?.Keys.Except(i.Keyboard.Keys) ?? new Key[] { })
{
var intermediateState = last.Clone();
if (intermediateState.Keyboard == null)
{
intermediateState.Keyboard = new KeyboardState();
}
intermediateState.Keyboard.Keys = intermediateState.Keyboard.Keys.Where(d => d != releasedKey);
last = intermediateState;
yield return(intermediateState);
}
foreach (var pressedKey in i.Keyboard.Keys.Except(last.Keyboard?.Keys ?? new Key[] { }))
{
var intermediateState = last.Clone();
if (intermediateState.Keyboard == null)
{
intermediateState.Keyboard = new KeyboardState();
}
intermediateState.Keyboard.Keys = intermediateState.Keyboard.Keys.Union(new[] { pressedKey });
last = intermediateState;
yield return(intermediateState);
}
}
}
}
private bool handleWheel(InputState state)
{
return(PropagateWheel(positionalInputQueue, state));
}
/// <summary> /// Handles the button being released. /// </summary> /// <param name="state">The current <see cref="InputState"/>.</param> /// <param name="targets">The list of targets that must handle the event. This will contain targets up to the target that handled the button down event.</param> protected abstract void HandleButtonUp(InputState state, List <Drawable> targets);
private bool handleMouseMove(InputState state, Vector2 lastPosition)
{
return(PropagateBlockableEvent(PositionalInputQueue, new MouseMoveEvent(state, lastPosition)));
}
private bool handleScroll(InputState state, Vector2 lastScroll, bool isPrecise)
{
return(PropagateBlockableEvent(PositionalInputQueue, new ScrollEvent(state, state.Mouse.Scroll - lastScroll, isPrecise)));
}
private void focusTopMostRequestingDrawable(InputState state) => keyboardInputQueue.FirstOrDefault(target => target.RequestingFocus)?.TriggerFocus(state, true);
// set PositionMouseDown right before the event is invoked so it can be used as the mouse down position for each button
private void setPositionMouseDown(InputState state)
{
state.Mouse.PositionMouseDown = MouseDownPosition;
}
private bool handleWheel(InputState state)
{
return(mouseInputQueue.Any(target => target.TriggerWheel(state)));
}
private bool handleMouseDragStart(InputState state)
{
draggingDrawable = mouseDownInputQueue?.FirstOrDefault(target => target.IsAlive && target.TriggerDragStart(state));
return(draggingDrawable != null);
}
private bool handleMouseDoubleClick(InputState state)
{
return(mouseInputQueue.Any(target => target.TriggerDoubleClick(state)));
}
private bool handleMouseDoubleClick(InputState state)
{
return(positionalInputQueue.Any(target => target.TriggerOnDoubleClick(state)));
}
private bool handleKeyDown(InputState state, Key key, bool repeat)
{
return(PropagateBlockableEvent(NonPositionalInputQueue, new KeyDownEvent(state, key, repeat)));
}
private bool handleMouseDrag(InputState state)
{
//Once a drawable is dragged, it remains in a dragged state until the drag is finished.
return(DraggedDrawable?.TriggerOnDrag(state) ?? false);
}
private bool handleKeyUp(InputState state, Key key)
{
return(PropagateBlockableEvent(NonPositionalInputQueue, new KeyUpEvent(state, key)));
}
/// <summary>
/// Handles the button being released.
/// </summary>
/// <param name="state">The current <see cref="InputState"/>.</param>
private void handleButtonUp(InputState state)
{
HandleButtonUp(state, ButtonDownInputQueue);
ButtonDownInputQueue = null;
}
private bool handleJoystickRelease(InputState state, JoystickButton button)
{
return(PropagateBlockableEvent(NonPositionalInputQueue, new JoystickReleaseEvent(state, button)));
}
/// <summary> /// Handles the button being pressed. /// </summary> /// <param name="state">The current <see cref="InputState"/>.</param> /// <param name="targets">The list of possible targets that can handle the event.</param> /// <returns>The <see cref="Drawable"/> that handled the event.</returns> protected abstract Drawable HandleButtonDown(InputState state, List <Drawable> targets);
protected override void Update()
{
var pendingStates = createDistinctInputStates(GetPendingStates()).ToArray();
unfocusIfNoLongerValid(CurrentState);
//we need to make sure the code in the foreach below is run at least once even if we have no new pending states.
if (pendingStates.Length == 0)
{
pendingStates = new[] { CurrentState }
}
;
foreach (InputState s in pendingStates)
{
bool hasKeyboard = s.Keyboard != null;
bool hasMouse = s.Mouse != null;
if (!hasKeyboard && !hasMouse)
{
continue;
}
var last = CurrentState;
//avoid lingering references that would stay forever.
last.Last = null;
CurrentState = s;
CurrentState.Last = last;
if (CurrentState.Keyboard == null)
{
CurrentState.Keyboard = last.Keyboard ?? new KeyboardState();
}
if (CurrentState.Mouse == null)
{
CurrentState.Mouse = last.Mouse ?? new MouseState();
}
TransformState(CurrentState);
//move above?
updateInputQueues(CurrentState);
if (hasMouse)
{
(s.Mouse as MouseState)?.SetLast(last.Mouse); //necessary for now as last state is used internally for stuff
updateHoverEvents(CurrentState);
updateMouseEvents(CurrentState);
}
if (hasKeyboard)
{
updateKeyboardEvents(CurrentState);
}
}
if (CurrentState.Mouse != null)
{
foreach (var d in mouseInputQueue)
{
if (d is IRequireHighFrequencyMousePosition)
{
if (d.TriggerMouseMove(CurrentState))
{
break;
}
}
}
}
keyboardRepeatTime -= Time.Elapsed;
if (FocusedDrawable == null)
{
focusTopMostRequestingDrawable(CurrentState);
}
base.Update();
}