private void OnDragCompleted(SplitterGrip grip, double change)
{
// if the change is negative the pop up was dragged to the left(top),
// otherwise it was dragged to the right(bottom)
var itemsControl = ItemsControl.ItemsControlFromItemContainer(grip.LeftChild) as SplitterItemsControl;
if (itemsControl == null)
{
return;
}
var gripOffset = GetGripOffset(grip);
var newOffset = gripOffset + change;
CoerceOffset(ref newOffset);
var actualChange = Math.Abs(newOffset - gripOffset);
var diffUnit = SplitterItemsControl.GetUnitForSize(itemsControl, actualChange);
var isLeftAbsolute = grip.LeftChild.IsFixed;
var isRightAbsolute = grip.RightChild.IsFixed;
try
{
// we defer updating the panel, until we're done.
itemsControl.DisallowPanelInvalidation = true;
if (isLeftAbsolute || isRightAbsolute)
{
if (isLeftAbsolute)
{
if (change < 0)
{
grip.LeftChild.Length -= actualChange;
}
else
{
grip.LeftChild.Length += actualChange;
}
}
if (isRightAbsolute)
{
if (change < 0)
{
grip.RightChild.Length += actualChange;
}
else
{
grip.RightChild.Length -= actualChange;
}
}
}
else // both use star based measurement system
{
if (change < 0)
{
grip.LeftChild.Length -= diffUnit;
grip.RightChild.Length += diffUnit;
}
else
{
grip.LeftChild.Length += diffUnit;
grip.RightChild.Length -= diffUnit;
}
}
}
finally
{
itemsControl.DisallowPanelInvalidation = false;
}
// we invalidate manually
var panel = grip.ParentOfType <SplitterItemsPanel>();
if (panel != null)
{
panel.InvalidateMeasure();
}
}
private void MoveGrip(SplitterGrip grip, SplitterItemsControl itemsControl, double verticalChange, double horizontalChange)
{
var isHorizontal = grip.Orientation == Orientation.Horizontal;
var change = isHorizontal ? verticalChange : horizontalChange;
var newLength = (isHorizontal ? grip.LeftChild.ActualHeight : grip.LeftChild.ActualWidth) + change;
CoerceOffset(ref newLength);
var coercedChange = newLength - (isHorizontal ? grip.LeftChild.ActualHeight : grip.LeftChild.ActualWidth);
coercedChange = Math.Abs(coercedChange);
var diffUnit = SplitterItemsControl.GetUnitForSize(itemsControl, coercedChange);
var isLeftAbsolute = grip.LeftChild.IsFixed;
var isRightAbsolute = grip.RightChild.IsFixed;
try
{
itemsControl.DisallowPanelInvalidation = true;
if (isLeftAbsolute || isRightAbsolute)
{
if (isLeftAbsolute)
{
if (change < 0)
{
grip.LeftChild.Length -= coercedChange;
}
else
{
grip.LeftChild.Length += coercedChange;
}
}
if (isRightAbsolute)
{
if (change < 0)
{
grip.RightChild.Length += coercedChange;
}
else
{
grip.RightChild.Length -= coercedChange;
}
}
}
else // both use star based measurement system
{
if (change < 0)
{
grip.LeftChild.Length -= diffUnit;
grip.RightChild.Length += diffUnit;
}
else
{
grip.LeftChild.Length += diffUnit;
grip.RightChild.Length -= diffUnit;
}
}
}
finally
{
itemsControl.DisallowPanelInvalidation = false;
}
// we invalidate manually
var panel = grip.ParentOfType <SplitterItemsPanel>();
if (panel != null)
{
panel.InvalidateMeasure();
}
}
