protected override void OnMouseMove(MouseEventArgs e)
{
if (_isDragging && _dragAdorner != null)
{
// update the position of the adorner
var current = e.GetPosition(this);
_dragAdorner.OffsetX = current.X - _mouseDown.X;
_dragAdorner.OffsetY = current.Y - _mouseDown.Y;
// find the item that we are dragging over
var element = InputHitTest(new Point(e.GetPosition(this).X, e.GetPosition(this).Y)) as UIElement;
if (element != null)
{
var itemOver = TreeHelpers.GetItemContainerFromChildElement(this, element) as FrameworkElement;
if (itemOver != null)
{
var p = Mouse.GetPosition(itemOver);
var q = PointToQuadrant(itemOver, p);
if (itemOver != _lastMouseOverItem || q != _lastMouseOverQuadrant)
{
if (q == ReorderQuadrant.BottomLeft || q == ReorderQuadrant.BottomRight)
{
_lastMoveOverPlacement = ReorderPlacement.After;
}
else
{
_lastMoveOverPlacement = ReorderPlacement.Before;
}
PreviewInsert(itemOver, _lastMoveOverPlacement);
_lastMouseOverItem = itemOver;
_lastMouseOverQuadrant = q;
}
}
}
}
base.OnMouseMove(e);
}
private void PreviewInsert(FrameworkElement relativeTo, ReorderPlacement placement)
{
if (_isDragging && _dragItem != null && relativeTo != null)
{
// get the index of the item being dragged
var relativeToIndex = ItemContainerGenerator.IndexFromContainer(relativeTo);
// get the index of insertion
var offset = (placement == ReorderPlacement.Before) ? 0 : 1;
_dragInsertIndex = relativeToIndex + offset;
for (int i = 0; i < Items.Count; i++)
{
double delta;
if (i > _dragItemIndex && i < _dragInsertIndex)
{
delta = -1 * GetOrientedDimension(_dragItem);
}
else if (i < _dragItemIndex && i >= _dragInsertIndex)
{
delta = GetOrientedDimension(_dragItem);
}
else
{
delta = 0;
}
TranslateItem((FrameworkElement)ItemContainerGenerator.ContainerFromIndex(i), delta, this.Duration, Orientation);
}
// if the insert location is after the current location, we need to decrement it
// by one after we've made the visual adjustments so that the actual drop index
// will be accurate
if (_dragInsertIndex > _dragItemIndex)
{
_dragInsertIndex--;
}
}
}
private void PreviewInsert(FrameworkElement relativeTo, ReorderPlacement placement)
{
if (m_isDragging && m_dragItem != null && relativeTo != null)
{
// get the index of the item being dragged
int relativeToIndex = ItemContainerGenerator.IndexFromContainer(relativeTo);
// get the index of insertion
var offset = (placement == ReorderPlacement.Before) ? 0 : 1;
m_dragInsertIndex = relativeToIndex + offset;
for (int i = 0; i < Items.Count; i++)
{
if (i > m_dragItemIndex && i < m_dragInsertIndex)
{
TranslateItem(ItemContainerGenerator.ContainerFromIndex(i) as FrameworkElement, (m_dragItem.ActualHeight * -1));
}
else if (i < m_dragItemIndex && i >= m_dragInsertIndex)
{
TranslateItem(ItemContainerGenerator.ContainerFromIndex(i) as FrameworkElement, (m_dragItem.ActualHeight));
}
else
{
TranslateItem(ItemContainerGenerator.ContainerFromIndex(i) as FrameworkElement, 0);
}
}
// if the insert location is after the current location, we need to decrement it
// by one after we've made the visual adjustments so that the actual drop index
// will be accurate
if (m_dragInsertIndex > m_dragItemIndex)
{
m_dragInsertIndex--;
}
}
}
private void PreviewInsert(FrameworkElement relativeTo, ReorderPlacement placement)
{
if (m_isDragging && m_dragItem != null && relativeTo != null) {
// get the index of the item being dragged
int relativeToIndex = ItemContainerGenerator.IndexFromContainer(relativeTo);
// get the index of insertion
var offset = (placement == ReorderPlacement.Before) ? 0 : 1;
m_dragInsertIndex = relativeToIndex + offset;
for (int i = 0; i < Items.Count; i++) {
if (i > m_dragItemIndex && i < m_dragInsertIndex) {
TranslateItem(ItemContainerGenerator.ContainerFromIndex(i) as FrameworkElement, (m_dragItem.ActualHeight * -1));
}
else if (i < m_dragItemIndex && i >= m_dragInsertIndex) {
TranslateItem(ItemContainerGenerator.ContainerFromIndex(i) as FrameworkElement, (m_dragItem.ActualHeight));
}
else {
TranslateItem(ItemContainerGenerator.ContainerFromIndex(i) as FrameworkElement, 0);
}
}
// if the insert location is after the current location, we need to decrement it
// by one after we've made the visual adjustments so that the actual drop index
// will be accurate
if (m_dragInsertIndex > m_dragItemIndex) m_dragInsertIndex--;
}
}
protected override void OnMouseMove(MouseEventArgs e)
{
if (m_isDragging && m_dragAdorner != null) {
// update the position of the adorner
Point current = e.GetPosition(this);
m_dragAdorner.OffsetY = current.Y - m_mouseDown.Y;
// find the item that we are dragging over
UIElement element = this.InputHitTest(new Point(this.ActualWidth / 2, e.GetPosition(this).Y)) as UIElement;
if (element != null) {
FrameworkElement itemOver = TreeHelpers.GetItemContainerFromChildElement(this, element) as FrameworkElement;
if (itemOver != null) {
Point p = Mouse.GetPosition(itemOver);
ReorderQuadrant q = PointToQuadrant(itemOver, p);
if (itemOver != m_lastMouseOverItem || q != m_lastMouseOverQuadrant) {
if (q == ReorderQuadrant.BottomLeft || q == ReorderQuadrant.BottomRight) {
m_lastMoveOverPlacement = ReorderPlacement.After;
}
else {
m_lastMoveOverPlacement = ReorderPlacement.Before;
}
PreviewInsert(itemOver, m_lastMoveOverPlacement);
m_lastMouseOverItem = itemOver;
m_lastMouseOverQuadrant = q;
}
}
}
}
base.OnMouseMove(e);
}
private void PreviewInsert(FrameworkElement relativeTo, ReorderPlacement placement)
{
if (m_isDragging && m_dragItem != null && relativeTo != null)
{
// get the index of the item being dragged
var relativeToIndex = ItemContainerGenerator.IndexFromContainer(relativeTo);
// get the index of insertion
var offset = (placement == ReorderPlacement.Before) ? 0 : 1;
m_dragInsertIndex = relativeToIndex + offset;
for (int i = 0; i < Items.Count; i++)
{
double delta;
if (i > m_dragItemIndex && i < m_dragInsertIndex)
{
delta = -1 * getOrientedDimension(m_dragItem);
}
else if (i < m_dragItemIndex && i >= m_dragInsertIndex)
{
delta = getOrientedDimension(m_dragItem);
}
else
{
delta = 0;
}
TranslateItem((FrameworkElement)ItemContainerGenerator.ContainerFromIndex(i), delta, this.Duration, Orientation);
}
// if the insert location is after the current location, we need to decrement it
// by one after we've made the visual adjustments so that the actual drop index
// will be accurate
if (m_dragInsertIndex > m_dragItemIndex)
{
m_dragInsertIndex--;
}
}
}
protected override void OnMouseMove(MouseEventArgs e)
{
if (_isDragging && _dragAdorner != null)
{
// update the position of the adorner
var current = e.GetPosition(this);
_dragAdorner.OffsetX = current.X - _mouseDown.X;
_dragAdorner.OffsetY = current.Y - _mouseDown.Y;
// find the item that we are dragging over
var element = InputHitTest(new Point(e.GetPosition(this).X, e.GetPosition(this).Y)) as UIElement;
if (element != null)
{
var itemOver = TreeHelpers.GetItemContainerFromChildElement(this, element) as FrameworkElement;
if (itemOver != null)
{
var p = Mouse.GetPosition(itemOver);
var q = PointToQuadrant(itemOver, p);
if (itemOver != _lastMouseOverItem || q != _lastMouseOverQuadrant)
{
if (q == ReorderQuadrant.BottomLeft || q == ReorderQuadrant.BottomRight)
{
_lastMoveOverPlacement = ReorderPlacement.After;
}
else
{
_lastMoveOverPlacement = ReorderPlacement.Before;
}
PreviewInsert(itemOver, _lastMoveOverPlacement);
_lastMouseOverItem = itemOver;
_lastMouseOverQuadrant = q;
}
}
}
}
base.OnMouseMove(e);
}
