private void SetHorizontalOffset(double physicalOffset, bool updateUI, bool updateScrollViewer)
{
var adjustedOffset = ListViewModel.DoubleArithmetics.Ceiling(physicalOffset);
bool needUpdate = !LayoutDoubleUtil.AreClose(this.lastScrollOffset.X, physicalOffset) || physicalOffset < 0;
var previousOffset = this.lastScrollOffset.X;
this.lastScrollOffset.X = adjustedOffset;
if (needUpdate)
{
if (this.childrenPanel != null && (updateUI || this.strategy.RequiresUpdate(this.panelAvailableSize, previousOffset, adjustedOffset)))
{
this.contentMeasureRequested = false;
this.childrenPanel.measureRequested = true;
this.childrenPanel.InvalidateMeasure();
}
if (updateScrollViewer)
{
this.scrollViewer.ChangeView(adjustedOffset, null, null, true);
// Ensure that scrollviewer has updated its position.
if (updateUI)
{
this.scrollViewer.UpdateLayout();
}
}
}
}
// Move the splitter by the given Delta's in the horizontal and vertical directions
private void MoveSplitter(double horizontalChange, double verticalChange)
{
double delta;
var dpi = this.GetDpi();
if (_resizeData.Panel.Orientation == Orientation.Horizontal)
{
delta = horizontalChange;
if (UseLayoutRounding)
{
delta = LayoutDoubleUtil.RoundLayoutValue(delta, dpi.DpiScaleX);
}
}
else
{
delta = verticalChange;
if (UseLayoutRounding)
{
delta = LayoutDoubleUtil.RoundLayoutValue(delta, dpi.DpiScaleY);
}
}
var definition1 = _resizeData.Definition1;
var definition2 = _resizeData.Definition2;
if (definition1 != null && definition2 != null)
{
double actualLength1 = definition1.ActualSize;
double actualLength2 = definition2.ActualSize;
// When splitting, Check to see if the total pixels spanned by the definitions
// is the same as before starting resize. If not cancel the drag
if (_resizeData.SplitBehavior == SplitBehavior.ResizeBoth &&
!LayoutDoubleUtil.AreClose(actualLength1 + actualLength2, _resizeData.OriginalDefinition1ActualLength + _resizeData.OriginalDefinition2ActualLength))
{
CancelResize();
return;
}
double min, max;
GetDeltaConstraints(out min, out max);
// Flip when the splitter's flow direction isn't the same as the grid's
if (FlowDirection != _resizeData.Panel.FlowDirection)
{
delta = -delta;
}
delta = Math.Min(Math.Max(delta, min), max);
double definition1LengthNew = actualLength1 + delta;
double definition2LengthNew = actualLength1 + actualLength2 - definition1LengthNew;
SetLengths(definition1LengthNew, definition2LengthNew);
}
}
// Move the splitter by the given Delta's in the horizontal and vertical directions
private void MoveSplitter(double horizontalChange, double verticalChange)
{
Debug.Assert(_resizeData != null, "_resizeData should not be null when calling MoveSplitter");
double delta;
DpiScale dpi = GetDpi();
// Calculate the offset to adjust the splitter. If layout rounding is enabled, we
// need to round to an integer physical pixel value to avoid round-ups of children that
// expand the bounds of the Grid. In practice this only happens in high dpi because
// horizontal/vertical offsets here are never fractional (they correspond to mouse movement
// across logical pixels). Rounding error only creeps in when converting to a physical
// display with something other than the logical 96 dpi.
if (_resizeData.ResizeDirection == GridResizeDirection.Columns)
{
delta = horizontalChange;
if (this.UseLayoutRounding)
{
delta = UIElement.RoundLayoutValue(delta, dpi.DpiScaleX);
}
}
else
{
delta = verticalChange;
if (this.UseLayoutRounding)
{
delta = UIElement.RoundLayoutValue(delta, dpi.DpiScaleY);
}
}
DefinitionBase definition1 = _resizeData.Definition1;
DefinitionBase definition2 = _resizeData.Definition2;
if (definition1 != null && definition2 != null)
{
double actualLength1 = GetActualLength(definition1);
double actualLength2 = GetActualLength(definition2);
// When splitting, Check to see if the total pixels spanned by the definitions
// is the same asbefore starting resize. If not cancel the drag
if (_resizeData.SplitBehavior == SplitBehavior.Split &&
!LayoutDoubleUtil.AreClose(actualLength1 + actualLength2, _resizeData.OriginalDefinition1ActualLength + _resizeData.OriginalDefinition2ActualLength))
{
CancelResize();
return;
}
double min, max;
GetDeltaConstraints(out min, out max);
// Flip when the splitter's flow direction isn't the same as the grid's
if (FlowDirection != _resizeData.Grid.FlowDirection)
{
delta = -delta;
}
// Constrain Delta to Min/MaxWidth of columns
delta = Math.Min(Math.Max(delta, min), max);
// With floating point operations there may be loss of precision to some degree. Eg. Adding a very
// small value to a very large one might result in the small value being ignored. In the following
// steps there are two floating point operations viz. actualLength1+delta and actualLength2-delta.
// It is possible that the addition resulted in loss of precision and the delta value was ignored, whereas
// the subtraction actual absorbed the delta value. This now means that
// (definition1LengthNew + definition2LengthNewis) 2 factors of precision away from
// (actualLength1 + actualLength2). This can cause a problem in the subsequent drag iteration where
// this will be interpreted as the cancellation of the resize operation. To avoid this imprecision we use
// make definition2LengthNew be a function of definition1LengthNew so that the precision or the loss
// thereof can be counterbalanced. See DevDiv bug#140228 for a manifestation of this problem.
double definition1LengthNew = actualLength1 + delta;
//double definition2LengthNew = actualLength2 - delta;
double definition2LengthNew = actualLength1 + actualLength2 - definition1LengthNew;
SetLengths(definition1LengthNew, definition2LengthNew);
}
}
// Token: 0x06004DDF RID: 19935 RVA: 0x0015F644 File Offset: 0x0015D844
private void MoveSplitter(double horizontalChange, double verticalChange)
{
DpiScale dpi = base.GetDpi();
double num;
if (this._resizeData.ResizeDirection == GridResizeDirection.Columns)
{
num = horizontalChange;
if (base.UseLayoutRounding)
{
num = UIElement.RoundLayoutValue(num, dpi.DpiScaleX);
}
}
else
{
num = verticalChange;
if (base.UseLayoutRounding)
{
num = UIElement.RoundLayoutValue(num, dpi.DpiScaleY);
}
}
DefinitionBase definition = this._resizeData.Definition1;
DefinitionBase definition2 = this._resizeData.Definition2;
if (definition != null && definition2 != null)
{
double actualLength = this.GetActualLength(definition);
double actualLength2 = this.GetActualLength(definition2);
if (this._resizeData.SplitBehavior == GridSplitter.SplitBehavior.Split && !LayoutDoubleUtil.AreClose(actualLength + actualLength2, this._resizeData.OriginalDefinition1ActualLength + this._resizeData.OriginalDefinition2ActualLength))
{
this.CancelResize();
return;
}
double val;
double val2;
this.GetDeltaConstraints(out val, out val2);
if (base.FlowDirection != this._resizeData.Grid.FlowDirection)
{
num = -num;
}
num = Math.Min(Math.Max(num, val), val2);
double num2 = actualLength + num;
double definition2Pixels = actualLength + actualLength2 - num2;
this.SetLengths(num2, definition2Pixels);
}
}
