/// <summary>
/// When an object in the InfoPannel is clicked set it to the focus of the screen
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ListObjectFocusOnMouseDown(object sender, MouseButtonEventArgs e)
{
// Get the sending object's view model from it's data context
InterstellaObjectViewModel SenderVM = ((Ellipse)sender).DataContext as InterstellaObjectViewModel;
// Set the view canvas page to focus on this object
CanvasPageViewModel.FocusOnObject(SenderVM);
}
/// <summary>
/// When an object is right clicked allow the user to edit the infomation of that object
/// using the hover data entry box
/// </summary>
private void EditObjectOnRightClick(object sender, MouseButtonEventArgs e)
{
// Get the view model of the clicked object
InterstellaObjectViewModel SenderAsVm = ((Ellipse)sender).DataContext as InterstellaObjectViewModel;
//Pause System
CanvasPageViewModel.Instance.SystemRunning = false;
// Open the data entry box with the sending object's VM
CanvasPageViewModel.Instance.OpenDataEntryBox.Execute(SenderAsVm);
}
/// <summary>
/// When object is left clicked;
/// IF SHIFT Down: When an Object is Left-Clicked focus on this object, by putting it at the centre cavnas
/// ELSE: start a drag to add velocity
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ObjectLeftClicked(object sender, MouseButtonEventArgs e)
{
// If the shift key is currently down
if (_KeysDown.Contains(Key.LeftShift))
{
InterstellaObjectViewModel ObjectVm = (InterstellaObjectViewModel)((Ellipse)sender).DataContext;
CanvasPageViewModel.FocusOnObject(ObjectVm);
}
else
{
// flag a drag event as active and set the dragged object to be the one that was clicked
_DragActive = true;
_DraggedObject = ((Ellipse)sender).DataContext as InterstellaObjectViewModel;
}
}
/// <summary>
/// On Mouse Up over object if a new object has been dropped put this into orbit around this object
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OjectMouseUp(object sender, MouseButtonEventArgs e)
{
// Get the view model of the object that mouse was releasd over
InterstellaObjectViewModel SenderVM = ((Ellipse)sender).DataContext as InterstellaObjectViewModel;
// If drag is active, and object overwhich the mouse was released is not the same as the drag object
if (_DragActive && SenderVM != _DraggedObject)
{
// Calculate the velocity require of the drag object to orbit the other
Vector OrbitVelocity = CanvasPageViewModel.GetOrbitVelocity(_DraggedObject.InterstellaObject, SenderVM.InterstellaObject);
//set the object's velocity to the calculated above, and end the drag operation
_DraggedObject.SetObjectVelocity(OrbitVelocity);
_DragActive = false;
}
}