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
);
}
protected void TestAcceptanceFor(IRenderer renderer, IGuiElement guiElement)
{
var hardware = new NullHardware(1024, 768);
var stage = new GuiStage();
stage.AddChild(guiElement);
// Layout and Render
stage.CalculateLayout(hardware);
stage.ProcessInteraction(hardware);
stage.Render(renderer);
var processingData = guiElement.GetLayoutProcessingData();
// drawing geometry
Assert.AreEqual(processingData.DrawingGeometry.X, 50);
Assert.AreEqual(processingData.DrawingGeometry.Y, 75);
Assert.AreEqual(processingData.DrawingGeometry.Width, 100);
Assert.AreEqual(processingData.DrawingGeometry.Height, 200);
// absolute geometry
Assert.AreEqual(processingData.AbsoluteGeometry.X, 50);
Assert.AreEqual(processingData.AbsoluteGeometry.Y, 75);
Assert.AreEqual(processingData.AbsoluteGeometry.Width, 100);
Assert.AreEqual(processingData.AbsoluteGeometry.Height, 200);
// clip rect
Assert.AreEqual(processingData.ClipRect.X, 50);
Assert.AreEqual(processingData.ClipRect.Y, 75);
Assert.AreEqual(processingData.ClipRect.Width, 100);
Assert.AreEqual(processingData.AbsoluteGeometry.Height, 200);
}
private void ProcessInputsRecursive(IGuiElement component, IRectangle clipRect)
{
if (!component.GetVisible())
{
return;
}
if (component is IGuiElementContainer)
{
var container = (IGuiElementContainer)component;
var children = container.GetChildren();
var componenetClipRect = component.GetLayoutProcessingData().ClipRect;
// merge the two rectangle to get the cut-set
var resultingClipRect = clipRect.Intersect(componenetClipRect);
// just go further in the recursion if there is space left in the clip rect
if (resultingClipRect.Width > 0 && resultingClipRect.Height > 0)
{
// first go down the recursion
// But we have to go from the last to the first child. We have to do it, so the top most child (with same parent as its sibblings)
// will receive events like Clicked, that are only sent to one gui element.
var count = children.Count;
for (var i = count - 1; i >= 0; --i)
{
var child = children[i];
ProcessInputsRecursive(child, resultingClipRect);
}
}
// on the back path check for events
ProcessComponentInputs(component, clipRect);
}
else
{
ProcessComponentInputs(component, clipRect);
}
}
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);
}
}
}