public void Grab()
{
var layout = _guiElement.GetLayout();
// create the container where we will move the draggable inside and where we create highlight for drop targets
DragAndDropStage = new Canvas();
_guiElement.GetStage().AddChild(DragAndDropStage);
// replace the guiElement with a spacer while it is draggeed
Replacer = new Spacer(layout.GetCalculatedWidth(), layout.GetCalculatedHeight());
_guiElement.GetParent().ReplaceChild(_guiElement, Replacer);
OriginalPosition = new Vector2(layout.X, layout.Y);
var absoluteGeometry = _guiElement.GetLayoutProcessingData().AbsoluteGeometry;
layout.X = absoluteGeometry.X;
layout.Y = absoluteGeometry.Y;
// add the draggable on to the DragAndDropStage
DragAndDropStage.AddChild(_guiElement);
MousePosInComponent = new Point(
GuiStage.MousePosition.X - layout.X,
GuiStage.MousePosition.Y - layout.Y
);
}
private void ProcessComponentInputs(IGuiElement component, IRectangle clipRect)
{
// does the element have mouse processing enabled?
if (!component.GetMouseEnabled())
{
return;
}
var processingData = component.GetLayoutProcessingData();
// is the mouse actually hovering over the element
var containsCurrent =
processingData.AbsoluteGeometry.Contains(GuiStage.MousePosition) && clipRect.Contains(GuiStage.MousePosition)
&&
component.GetLayout().Visible
;
// was it hovering over the element in the last frame
var containsPrevious = processingData.MouseWasOver;
// remember the current situation for the next frame
processingData.MouseWasOver = containsCurrent;
if (containsCurrent)
{
_result.GuiElementsUnderMouse.Add(component);
}
// check for mouse over
if (containsCurrent && !containsPrevious)
{
_result.MouseOverEvent.Add(component);
}
// check for mouse out
if (!containsCurrent && containsPrevious)
{
_result.MouseOutEvent.Add(component);
}
// check for clicks
if (containsCurrent)
{
// check for left mouse down
if (!_previousMouseButtonLeft && _currentMouseButtonLeft)
{
_result.LeftMouseDownEvent.Add(component);
}
// check for left mouse up / clicked
if (_previousMouseButtonLeft && !_currentMouseButtonLeft)
{
_result.LeftMouseUpEvent.Add(component);
_result.ClickedEvent.Add(component);
// detect double click
var now = DateTime.Now;
if ((now - processingData.LastClickTimestamp).TotalMilliseconds < 500)
{
_result.DoubleClickedEvent.Add(component);
}
// remember the last click time
processingData.LastClickTimestamp = DateTime.Now;
}
// check for right mouse down
if (!_previousMouseButtonRight && _currentMouseButtonRight)
{
_result.RightMouseDownEvent.Add(component);
}
// check for right mouse up
if (_previousMouseButtonRight && !_currentMouseButtonRight)
{
_result.RightMouseUpEvent.Add(component);
}
// check for middle mouse down
if (!_previousMouseButtonMiddle && _currentMouseButtonMiddle)
{
_result.MiddleMouseDownEvent.Add(component);
}
// check for right mouse up
if (_previousMouseButtonMiddle && !_currentMouseButtonMiddle)
{
_result.MiddleMouseUpEvent.Add(component);
}
}
}
