private void UpdateMouseOver(Viewport viewport, RenderUIElement state)
{
if (input == null || !input.HasMouse)
{
return;
}
var intersectionPoint = Vector3.Zero;
var mousePosition = input.MousePosition;
var rootElement = state.UIComponent.RootElement;
var lastMouseOverElement = state.LastMouseOverElement;
var mouseOverElement = lastMouseOverElement;
// determine currently overred element.
if (mousePosition != state.LastMousePosition)
{
Ray uiRay;
if (!GetTouchPosition(state.UIComponent, ref viewport, mousePosition, out uiRay))
{
return;
}
mouseOverElement = GetElementAtScreenPosition(rootElement, uiRay, ref intersectionPoint);
}
// find the common parent between current and last overred elements
var commonElement = FindCommonParent(mouseOverElement, lastMouseOverElement);
// disable mouse over state to previously overred hierarchy
var parent = lastMouseOverElement;
while (parent != commonElement && parent != null)
{
parent.MouseOverState = MouseOverState.MouseOverNone;
parent = parent.VisualParent;
}
// enable mouse over state to currently overred hierarchy
if (mouseOverElement != null)
{
// the element itself
mouseOverElement.MouseOverState = MouseOverState.MouseOverElement;
// its hierarchy
parent = mouseOverElement.VisualParent;
while (parent != null)
{
if (parent.IsHierarchyEnabled)
{
parent.MouseOverState = MouseOverState.MouseOverChild;
}
parent = parent.VisualParent;
}
}
// update cached values
state.LastMouseOverElement = mouseOverElement;
state.LastMousePosition = mousePosition;
}
partial void PickingUpdate(RenderUIElement renderUIElement, Viewport viewport, ref Matrix worldViewProj, GameTime drawTime)
{
if (renderUIElement.UIComponent.Page?.RootElement == null)
return;
UpdateMouseOver(ref viewport, ref worldViewProj, renderUIElement);
UpdateTouchEvents(ref viewport, ref worldViewProj, renderUIElement, drawTime);
}
partial void PickingUpdate(RenderUIElement renderUIElement, Viewport viewport, GameTime drawTime)
{
if (renderUIElement.UIComponent.RootElement == null)
{
return;
}
UpdateMouseOver(viewport, renderUIElement);
UpdateTouchEvents(viewport, renderUIElement, drawTime);
}
partial void PickingUpdate(RenderUIElement renderUIElement, Viewport viewport, ref Matrix worldViewProj, GameTime drawTime)
{
if (renderUIElement.UIComponent.Page?.RootElement == null)
{
return;
}
UpdateMouseOver(ref viewport, ref worldViewProj, renderUIElement);
UpdateTouchEvents(ref viewport, ref worldViewProj, renderUIElement, drawTime);
}
private void UpdateTouchEvents(ref Viewport viewport, ref Matrix worldViewProj, RenderUIElement state, GameTime gameTime)
{
var rootElement = state.UIComponent.Page.RootElement;
var intersectionPoint = Vector3.Zero;
var lastTouchPosition = new Vector2(float.NegativeInfinity);
// analyze pointer event input and trigger UI touch events depending on hit Tests
foreach (var pointerEvent in compactedPointerEvents)
{
// performance optimization: skip all the events that started outside of the UI
var lastTouchedElement = state.LastTouchedElement;
if (lastTouchedElement == null && pointerEvent.EventType != PointerEventType.Pressed)
{
continue;
}
var time = gameTime.Total;
var currentTouchPosition = pointerEvent.Position;
var currentTouchedElement = lastTouchedElement;
// re-calculate the element under cursor if click position changed.
if (lastTouchPosition != currentTouchPosition)
{
Ray uiRay;
if (!GetTouchPosition(state.UIComponent, ref viewport, ref worldViewProj, currentTouchPosition, out uiRay))
{
continue;
}
currentTouchedElement = GetElementAtScreenPosition(rootElement, ref uiRay, ref worldViewProj, ref intersectionPoint);
}
if (pointerEvent.EventType == PointerEventType.Pressed || pointerEvent.EventType == PointerEventType.Released)
{
state.LastIntersectionPoint = intersectionPoint;
}
// TODO: add the pointer type to the event args?
var touchEvent = new TouchEventArgs
{
Action = TouchAction.Down,
Timestamp = time,
ScreenPosition = currentTouchPosition,
ScreenTranslation = pointerEvent.DeltaPosition,
WorldPosition = intersectionPoint,
WorldTranslation = intersectionPoint - state.LastIntersectionPoint
};
switch (pointerEvent.EventType)
{
case PointerEventType.Pressed:
touchEvent.Action = TouchAction.Down;
currentTouchedElement?.RaiseTouchDownEvent(touchEvent);
break;
case PointerEventType.Released:
touchEvent.Action = TouchAction.Up;
// generate enter/leave events if we passed from an element to another without move events
if (currentTouchedElement != lastTouchedElement)
{
ThrowEnterAndLeaveTouchEvents(currentTouchedElement, lastTouchedElement, touchEvent);
}
// trigger the up event
currentTouchedElement?.RaiseTouchUpEvent(touchEvent);
break;
case PointerEventType.Moved:
touchEvent.Action = TouchAction.Move;
// first notify the move event (even if the touched element changed in between it is still coherent in one of its parents)
currentTouchedElement?.RaiseTouchMoveEvent(touchEvent);
// then generate enter/leave events if we passed from an element to another
if (currentTouchedElement != lastTouchedElement)
{
ThrowEnterAndLeaveTouchEvents(currentTouchedElement, lastTouchedElement, touchEvent);
}
break;
case PointerEventType.Canceled:
touchEvent.Action = TouchAction.Move;
// generate enter/leave events if we passed from an element to another without move events
if (currentTouchedElement != lastTouchedElement)
{
ThrowEnterAndLeaveTouchEvents(currentTouchedElement, lastTouchedElement, touchEvent);
}
// then raise leave event to all the hierarchy of the previously selected element.
var element = currentTouchedElement;
while (element != null)
{
if (element.IsTouched)
{
element.RaiseTouchLeaveEvent(touchEvent);
}
element = element.VisualParent;
}
break;
default:
throw new ArgumentOutOfRangeException();
}
lastTouchPosition = currentTouchPosition;
state.LastTouchedElement = currentTouchedElement;
state.LastIntersectionPoint = intersectionPoint;
}
}
private void UpdateMouseOver(ref Viewport viewport, ref Matrix worldViewProj, RenderUIElement state)
{
if (input == null || !input.HasMouse)
return;
var intersectionPoint = Vector3.Zero;
var mousePosition = input.MousePosition;
var rootElement = state.UIComponent.Page.RootElement;
var lastMouseOverElement = state.LastMouseOverElement;
var mouseOverElement = lastMouseOverElement;
// determine currently overred element.
if (mousePosition != state.LastMousePosition)
{
Ray uiRay;
if (!GetTouchPosition(state.UIComponent, ref viewport, ref worldViewProj, mousePosition, out uiRay))
return;
mouseOverElement = GetElementAtScreenPosition(rootElement, ref uiRay, ref worldViewProj, ref intersectionPoint);
}
// find the common parent between current and last overred elements
var commonElement = FindCommonParent(mouseOverElement, lastMouseOverElement);
// disable mouse over state to previously overred hierarchy
var parent = lastMouseOverElement;
while (parent != commonElement && parent != null)
{
parent.MouseOverState = MouseOverState.MouseOverNone;
parent = parent.VisualParent;
}
// enable mouse over state to currently overred hierarchy
if (mouseOverElement != null)
{
// the element itself
mouseOverElement.MouseOverState = MouseOverState.MouseOverElement;
// its hierarchy
parent = mouseOverElement.VisualParent;
while (parent != null)
{
if (parent.IsHierarchyEnabled)
parent.MouseOverState = MouseOverState.MouseOverChild;
parent = parent.VisualParent;
}
}
// update cached values
state.LastMouseOverElement = mouseOverElement;
state.LastMousePosition = mousePosition;
}
private void UpdateTouchEvents(ref Viewport viewport, ref Matrix worldViewProj, RenderUIElement state, GameTime gameTime)
{
var rootElement = state.UIComponent.Page.RootElement;
var intersectionPoint = Vector3.Zero;
var lastTouchPosition = new Vector2(float.NegativeInfinity);
// analyze pointer event input and trigger UI touch events depending on hit Tests
foreach (var pointerEvent in compactedPointerEvents)
{
// performance optimization: skip all the events that started outside of the UI
var lastTouchedElement = state.LastTouchedElement;
if (lastTouchedElement == null && pointerEvent.State != PointerState.Down)
continue;
var time = gameTime.Total;
var currentTouchPosition = pointerEvent.Position;
var currentTouchedElement = lastTouchedElement;
// re-calculate the element under cursor if click position changed.
if (lastTouchPosition != currentTouchPosition)
{
Ray uiRay;
if (!GetTouchPosition(state.UIComponent, ref viewport, ref worldViewProj, currentTouchPosition, out uiRay))
continue;
currentTouchedElement = GetElementAtScreenPosition(rootElement, ref uiRay, ref worldViewProj, ref intersectionPoint);
}
if (pointerEvent.State == PointerState.Down || pointerEvent.State == PointerState.Up)
state.LastIntersectionPoint = intersectionPoint;
// TODO: add the pointer type to the event args?
var touchEvent = new TouchEventArgs
{
Action = TouchAction.Down,
Timestamp = time,
ScreenPosition = currentTouchPosition,
ScreenTranslation = pointerEvent.DeltaPosition,
WorldPosition = intersectionPoint,
WorldTranslation = intersectionPoint - state.LastIntersectionPoint
};
switch (pointerEvent.State)
{
case PointerState.Down:
touchEvent.Action = TouchAction.Down;
currentTouchedElement?.RaiseTouchDownEvent(touchEvent);
break;
case PointerState.Up:
touchEvent.Action = TouchAction.Up;
// generate enter/leave events if we passed from an element to another without move events
if (currentTouchedElement != lastTouchedElement)
ThrowEnterAndLeaveTouchEvents(currentTouchedElement, lastTouchedElement, touchEvent);
// trigger the up event
currentTouchedElement?.RaiseTouchUpEvent(touchEvent);
break;
case PointerState.Move:
touchEvent.Action = TouchAction.Move;
// first notify the move event (even if the touched element changed in between it is still coherent in one of its parents)
currentTouchedElement?.RaiseTouchMoveEvent(touchEvent);
// then generate enter/leave events if we passed from an element to another
if (currentTouchedElement != lastTouchedElement)
ThrowEnterAndLeaveTouchEvents(currentTouchedElement, lastTouchedElement, touchEvent);
break;
case PointerState.Out:
case PointerState.Cancel:
touchEvent.Action = TouchAction.Move;
// generate enter/leave events if we passed from an element to another without move events
if (currentTouchedElement != lastTouchedElement)
ThrowEnterAndLeaveTouchEvents(currentTouchedElement, lastTouchedElement, touchEvent);
// then raise leave event to all the hierarchy of the previously selected element.
var element = currentTouchedElement;
while (element != null)
{
if (element.IsTouched)
element.RaiseTouchLeaveEvent(touchEvent);
element = element.VisualParent;
}
break;
default:
throw new ArgumentOutOfRangeException();
}
lastTouchPosition = currentTouchPosition;
state.LastTouchedElement = currentTouchedElement;
state.LastIntersectionPoint = intersectionPoint;
}
}
partial void PickingUpdate(RenderUIElement renderUIElement, Viewport viewport, ref Matrix worldViewProj, GameTime drawTime);
public UIElementState(RenderUIElement renderObject)
{
RenderObject = renderObject;
WorldViewProjectionMatrix = Matrix.Identity;
}
partial void PickingUpdate(RenderUIElement renderUIElement, Viewport viewport, GameTime drawTime);
partial void PickingUpdate(RenderUIElement renderUIElement, Viewport viewport, ref Matrix worldViewProj, GameTime drawTime);
public UIElementState(RenderUIElement renderObject)
{
RenderObject = renderObject;
WorldViewProjectionMatrix = Matrix.Identity;
}
