Also, ich bin mit diesem Ansatz der Lage sein, ein Bild ziehen:Ziehen Bild ihn innerhalb der Mutter
Und funktioniert großartig, aber das Problem ist, es auf einer Leinwand hängt aber es zieht und zieht das Bild außerhalb der Leinwand. Dies ist der Extender, den ich verwende, ist es möglich, sich auf die ursprüngliche Leinwandgröße zu beschränken.
Was ich tun möchte, ist in der Lage zu sein (innerhalb der ursprünglichen Leinwandgröße) das Bild zu ziehen, um Teile zu sehen, die am Anfang nicht sichtbar sind.
Extender
public class DraggableExtender : DependencyObject
{
// This is the dependency property we're exposing - we'll
// access this as DraggableExtender.CanDrag="true"/"false"
public static readonly DependencyProperty CanDragProperty =
DependencyProperty.RegisterAttached("CanDrag",
typeof(bool),
typeof(DraggableExtender),
new UIPropertyMetadata(false, OnChangeCanDragProperty));
// The expected static setter
public static void SetCanDrag(UIElement element, bool o)
{
element.SetValue(CanDragProperty, o);
}
// the expected static getter
public static bool GetCanDrag(UIElement element)
{
return (bool)element.GetValue(CanDragProperty);
}
// This is triggered when the CanDrag property is set. We'll
// simply check the element is a UI element and that it is
// within a canvas. If it is, we'll hook into the mouse events
private static void OnChangeCanDragProperty(DependencyObject d,
DependencyPropertyChangedEventArgs e)
{
UIElement element = d as UIElement;
if (element == null) return;
if (e.NewValue != e.OldValue)
{
if ((bool)e.NewValue)
{
element.PreviewMouseDown += element_PreviewMouseDown;
element.PreviewMouseUp += element_PreviewMouseUp;
element.PreviewMouseMove += element_PreviewMouseMove;
}
else
{
element.PreviewMouseDown -= element_PreviewMouseDown;
element.PreviewMouseUp -= element_PreviewMouseUp;
element.PreviewMouseMove -= element_PreviewMouseMove;
}
}
}
// Determine if we're presently dragging
private static bool _isDragging = false;
// The offset from the top, left of the item being dragged
// and the original mouse down
private static Point _offset;
// This is triggered when the mouse button is pressed
// on the element being hooked
static void element_PreviewMouseDown(object sender,
System.Windows.Input.MouseButtonEventArgs e)
{
// Ensure it's a framework element as we'll need to
// get access to the visual tree
FrameworkElement element = sender as FrameworkElement;
if (element == null) return;
// start dragging and get the offset of the mouse
// relative to the element
_isDragging = true;
_offset = e.GetPosition(element);
}
// This is triggered when the mouse is moved over the element
private static void element_PreviewMouseMove(object sender,
MouseEventArgs e)
{
// If we're not dragging, don't bother - also validate the element
if (!_isDragging) return;
FrameworkElement element = sender as FrameworkElement;
if (element == null) return;
Canvas canvas = element.Parent as Canvas;
if (canvas == null) return;
// Get the position of the mouse relative to the canvas
Point mousePoint = e.GetPosition(canvas);
// Offset the mouse position by the original offset position
mousePoint.Offset(-_offset.X, -_offset.Y);
// Move the element on the canvas
element.SetValue(Canvas.LeftProperty, mousePoint.X);
element.SetValue(Canvas.TopProperty, mousePoint.Y);
}
// this is triggered when the mouse is released
private static void element_PreviewMouseUp(object sender,
MouseButtonEventArgs e)
{
_isDragging = false;
}
}
Rhyous du bist der Chef! Dank bro! Eigentlich war das das Problem. –