public void AddDragHandler(UIElement canvas)
{
MouseButtonEventHandler startDragging = null;
startDragging = (object sender, MouseButtonEventArgs downEvent) =>
{
if (downEvent.ChangedButton != MouseButton.Middle)
{
downEvent.Handled = false;
return;
}
downEvent.Handled = true;
canvas.CaptureMouse();
var dragStartPos = PointConversions.CanvasFromMouse(downEvent.MouseDevice, canvas);
var originStartPos = _origin.Point;
MouseEventHandler MiddleDragListener = (object o, MouseEventArgs moveEvent) =>
{
var mouse_pos = PointConversions.CanvasFromMouse(moveEvent.MouseDevice, canvas);
_origin.Point = new CanvasPosition
{
X = originStartPos.X + (mouse_pos.X - dragStartPos.X),
Y = originStartPos.Y + (mouse_pos.Y - dragStartPos.Y),
};
};
MouseButtonEventHandler mouseUpListener = null;
mouseUpListener = (object bob, MouseButtonEventArgs upEvent) =>
{
if (upEvent.ChangedButton != MouseButton.Middle)
{
upEvent.Handled = false;
return;
}
canvas.ReleaseMouseCapture();
upEvent.Handled = true;
canvas.MouseMove -= MiddleDragListener;
canvas.MouseUp -= mouseUpListener;
canvas.MouseDown += startDragging;
};
canvas.MouseMove += MiddleDragListener;
canvas.MouseUp += mouseUpListener;
canvas.MouseDown -= startDragging;
};
canvas.MouseDown += startDragging;
}
public void DoDragDrop(IDataObject dataObject, UIElement dragSource, bool showDragVisual, bool useVisualBrush, DragDropEffects effects)
{
if (!IsDragging)
{
_useDefaultCursor = true;
_dragScope = Application.Current.MainWindow.Content as FrameworkElement;
bool previousDrop = _dragScope.AllowDrop;
_dragScope.AllowDrop = true;
_dragScope.PreviewDragOver += DragScope_PreviewDragOver;
_dragScope.DragOver += DragScope_DragOver;
_dragScope.DragLeave += DragScope_DragLeave;
_dragScope.DragEnter += DragScope_DragEnter;
_dragScope.GiveFeedback += DragSource_GiveFeedback;
_dragScope.QueryContinueDrag += DragScope_QueryContinueDrag;
var _layer = AdornerLayer.GetAdornerLayer(_dragScope);
if (showDragVisual)
{
_dragAdorner = new DragAdorner(_dragScope, dragSource, useVisualBrush);
_layer.Add(_dragAdorner);
}
IsDragging = true;
_dragHasLeftScope = false;
dragSource.CaptureMouse();
DragDropEffects de = System.Windows.DragDrop.DoDragDrop(dragSource, dataObject, effects);
dragSource.ReleaseMouseCapture();
if (_dragAdorner != null)
{
_layer.Remove(_dragAdorner);
_dragAdorner = null;
}
_dragScope.AllowDrop = previousDrop;
_dragScope.GiveFeedback -= DragSource_GiveFeedback;
_dragScope.DragLeave -= DragScope_DragLeave;
_dragScope.DragLeave -= DragScope_DragEnter;
_dragScope.QueryContinueDrag -= DragScope_QueryContinueDrag;
_dragScope.DragOver -= DragScope_DragOver;
_dragScope.PreviewDragOver -= DragScope_PreviewDragOver;
IsDragging = false;
}
}
public PageFlipper(Size pageSize, UIElement hotCorner, UIElement pageHolder, FrameworkElement curlShadow, FrameworkElement dropShadow)
{
Contract.Requires(pageSize.IsValid());
m_pageSize = pageSize;
m_hotCorner = hotCorner;
m_curlShadow = curlShadow;
m_dropShadow = dropShadow;
// can be null
m_pageHolder = pageHolder;
#region helper values
m_pageHalfHeight = m_pageSize.Height * .5;
m_origin = new Point(m_pageSize.Width, m_pageSize.Height / 2.0);
m_pageDiagonal = Math.Sqrt(m_pageSize.Width * m_pageSize.Width + m_pageSize.Height * m_pageSize.Height);
m_pointLeft = new Point(-m_pageSize.Width, m_pageHalfHeight);
m_pointRight = new Point(m_pageSize.Width, m_pageHalfHeight);
#endregion
#region clips and transforms
m_pageTransformGroup = new TransformGroup();
m_pageTransformGroup.Children.Add(new TranslateTransform() { Y = -m_pageSize.Height });
m_pageTransformGroup.Children.Add(m_pageRotateTransform = new RotateTransform());
m_pageTransformGroup.Children.Add(m_pageTranslateTransform = new TranslateTransform());
m_pageHolderClip = new RectangleGeometry() { Rect = new Rect(0, 0, m_pageSize.Width, m_pageSize.Height * 2) };
m_nextPageClip = new RectangleGeometry() { Rect = new Rect(0, 0, m_pageSize.Width * 2, m_pageSize.Height * 2) };
if (m_curlShadow != null)
{
var group = new TransformGroup();
group.Children.Add(m_curlShadowRotate = new RotateTransform());
group.Children.Add(m_curlShadowTranslate = new TranslateTransform());
m_curlShadow.RenderTransform = group;
m_curlShadow.Height = m_pageDiagonal * 1.5;
m_curlShadowRotate.CenterX = m_curlShadow.Width;
m_curlShadowRotate.CenterY = m_pageDiagonal;
m_curlShadowTranslate.Y = m_pageSize.Height - m_pageDiagonal;
}
if (m_dropShadow != null)
{
//m_dropShadowBlurEffect = new BlurEffect() { Radius = 20 };
//m_dropShadow.Effect = m_dropShadowBlurEffect;
m_dropShadow.RenderTransform = m_pageTransformGroup;
m_dropShadow.Width = m_pageSize.Width;
m_dropShadow.Height = m_pageSize.Height;
}
#endregion
// MOST OF THE LOADED FUNCTION IS USED TO SET LOOK UP VALUES
// BASED ON THE pageWidth AND pageHeight INITIALLY DEFINED.
// POSITION THE PAGE AND SPINE VISUALS ACCORDINGLY
m_mouse.X = m_pageSize.Width - 1;
m_mouse.Y = m_pageHalfHeight - 1;
m_follow = m_mouse;
#region mouse handlers
if (m_hotCorner != null && m_pageHolder != null)
{
m_hotCorner.MouseMove += (sender, e) =>
{
m_animating = false;
m_listener.StartListening();
Point testBounds = (Point)e.GetPosition(m_pageHolder).Subtract(m_origin);
if (testBounds.X > m_pageSize.Width && testBounds.Y > m_pageHalfHeight)
{
m_mouse = m_pointRight;
}
else
{
m_mouse = testBounds;
}
};
m_hotCorner.MouseLeftButtonDown += (sender, e) =>
{
m_hotCorner.CaptureMouse();
};
m_hotCorner.MouseLeftButtonUp += (sender, e) =>
{
m_listener.StartListening();
m_hotCorner.ReleaseMouseCapture();
m_mouse = (m_mouse.X < 0) ? m_pointLeft : m_pointRight;
};
m_hotCorner.MouseLeave += (sender, e) =>
{
m_listener.StartListening();
m_mouse = m_pointRight;
};
}
#endregion
m_listener.Rendering += (sender, args) => updateUI();
m_listener.IsListeningChanged += (sender, args) =>
{
var handler = IsAnimatingChanged;
if (handler != null)
{
handler(this, EventArgs.Empty);
}
};
}
/// <summary>
/// Handler for the event when the user stops dragging the dragElement and releases it.
/// </summary>
/// <param name="child">UIElement being dragged</param>
/// <param name="position">Position where the user clicked w.r.t. the UIElement being dragged</param>
/// <param name="positionInParent">Position where the user clicked w.r.t. the FluidWrapPanel (the parentFWPanel of the UIElement being dragged</param>
internal void EndFluidDrag(UIElement child, Point position, Point positionInParent)
{
if ((child == null) || (!IsComposing))
return;
// Call the event handler core on the Dispatcher. (Improves efficiency!)
Dispatcher.BeginInvoke(new Action(() =>
{
if ((dragElement != null) && (layoutManager != null))
{
dragElement.RenderTransform = layoutManager.CreateTransform(positionInParent.X - dragStartPoint.X,
positionInParent.Y - dragStartPoint.Y,
DragScale,
DragScale);
child.Opacity = NORMAL_OPACITY;
// Z-Index is set to 1 so that during the animation it does not go below other elements.
child.SetValue(Canvas.ZIndexProperty, Z_INDEX_INTERMEDIATE);
// Release the mouse capture
child.ReleaseMouseCapture();
// Reference used to set the Z-Index to 0 during the UpdateFluidLayout
lastDragElement = dragElement;
dragElement = null;
}
UpdateFluidLayout();
}));
}
public static void MouseUp(MouseButtonEventArgs e, UIElement element, IControlMouseInteraction control)
{
var location = e.GetPosition(element);
var keysHeld = GetKeysHeld();
float x = (float)location.X;
float y = (float)location.Y;
element.ReleaseMouseCapture();
switch (e.ChangedButton)
{
case MouseButton.Left:
control.MouseUp(x, y, MouseButtonType.Left, keysHeld);
break;
case MouseButton.Middle:
control.MouseUp(x, y, MouseButtonType.Middle, keysHeld);
break;
case MouseButton.Right:
control.MouseUp(x, y, MouseButtonType.Right, keysHeld);
break;
}
}
/// <summary>
/// Handler for the event when the user stops dragging the dragElement and releases it.
/// </summary>
/// <param name="child">UIElement being dragged</param>
/// <param name="position">Position where the user clicked w.r.t. the UIElement being dragged</param>
/// <param name="positionInParent">Position where the user clicked w.r.t. the FluidWrapPanel (the parentFWPanel of the UIElement being dragged</param>
internal async Task EndFluidDragAsync(UIElement child, Point position, Point positionInParent)
{
if ((child == null) || (!IsComposing) || (_dragElement == null))
return;
// Call the event handler core on the Dispatcher. (Improves efficiency!)
await Dispatcher.InvokeAsync(() =>
{
_dragElement.RenderTransform = CreateTransform(positionInParent.X - _dragStartPoint.X,
positionInParent.Y - _dragStartPoint.Y,
DragScale,
DragScale);
child.Opacity = NORMAL_OPACITY;
// Z-Index is set to 1 so that during the animation it does not go below other elements.
child.SetValue(ZIndexProperty, Z_INDEX_INTERMEDIATE);
// Release the mouse capture
child.ReleaseMouseCapture();
// Reference used to set the Z-Index to 0 during the UpdateFluidLayout
_lastDragElement = _dragElement;
_dragElement = null;
_lastExchangeElement = null;
InvalidateVisual();
});
}
