/// <summary>
/// Helper method which implements the stack like measure.
/// </summary>
internal static Size StackMeasureHelper(IStackMeasure measureElement, IStackMeasureScrollData scrollData, Size constraint)
{
Size stackDesiredSize = new Size();
UIElementCollection children = measureElement.InternalChildren;
Size layoutSlotSize = constraint;
bool fHorizontal = (measureElement.Orientation == Orientation.Horizontal);
int firstViewport; // First child index in the viewport.
int lastViewport = -1; // Last child index in the viewport. -1 indicates we have not yet iterated through the last child.
double logicalVisibleSpace, childLogicalSize;
//
// Initialize child sizing and iterator data
// Allow children as much size as they want along the stack.
//
if (fHorizontal)
{
layoutSlotSize.Width = Double.PositiveInfinity;
if (measureElement.IsScrolling && measureElement.CanVerticallyScroll) { layoutSlotSize.Height = Double.PositiveInfinity; }
firstViewport = (measureElement.IsScrolling) ? CoerceOffsetToInteger(scrollData.Offset.X, children.Count) : 0;
logicalVisibleSpace = constraint.Width;
}
else
{
layoutSlotSize.Height = Double.PositiveInfinity;
if (measureElement.IsScrolling && measureElement.CanHorizontallyScroll) { layoutSlotSize.Width = Double.PositiveInfinity; }
firstViewport = (measureElement.IsScrolling) ? CoerceOffsetToInteger(scrollData.Offset.Y, children.Count) : 0;
logicalVisibleSpace = constraint.Height;
}
//
// Iterate through children.
// While we still supported virtualization, this was hidden in a child iterator (see source history).
//
for (int i = 0, count = children.Count; i < count; ++i)
{
// Get next child.
UIElement child = children[i];
if (child == null) { continue; }
// Measure the child.
child.Measure(layoutSlotSize);
Size childDesiredSize = child.DesiredSize;
// Accumulate child size.
if (fHorizontal)
{
stackDesiredSize.Width += childDesiredSize.Width;
stackDesiredSize.Height = Math.Max(stackDesiredSize.Height, childDesiredSize.Height);
childLogicalSize = childDesiredSize.Width;
}
else
{
stackDesiredSize.Width = Math.Max(stackDesiredSize.Width, childDesiredSize.Width);
stackDesiredSize.Height += childDesiredSize.Height;
childLogicalSize = childDesiredSize.Height;
}
// Adjust remaining viewport space if we are scrolling and within the viewport region.
// While scrolling (not virtualizing), we always measure children before and after the viewport.
if (measureElement.IsScrolling && lastViewport == -1 && i >= firstViewport)
{
logicalVisibleSpace -= childLogicalSize;
if (DoubleUtil.LessThanOrClose(logicalVisibleSpace, 0.0))
{
lastViewport = i;
}
}
}
//
// Compute Scrolling stuff.
//
if (measureElement.IsScrolling)
{
// Compute viewport and extent.
Size viewport = constraint;
Size extent = stackDesiredSize;
Vector offset = scrollData.Offset;
// If we have not yet set the last child in the viewport, set it to the last child.
if (lastViewport == -1) { lastViewport = children.Count - 1; }
// If we or children have resized, it's possible that we can now display more content.
// This is true if we started at a nonzero offeset and still have space remaining.
// In this case, we loop back through previous children until we run out of space.
while (firstViewport > 0)
{
double projectedLogicalVisibleSpace = logicalVisibleSpace;
if (fHorizontal) { projectedLogicalVisibleSpace -= children[firstViewport - 1].DesiredSize.Width; }
else { projectedLogicalVisibleSpace -= children[firstViewport - 1].DesiredSize.Height; }
// If we have run out of room, break.
if (DoubleUtil.LessThan(projectedLogicalVisibleSpace, 0.0)) { break; }
// Adjust viewport
firstViewport--;
logicalVisibleSpace = projectedLogicalVisibleSpace;
}
int logicalExtent = children.Count;
int logicalViewport = lastViewport - firstViewport;
// We are conservative when estimating a viewport, not including the last element in case it is only partially visible.
// We want to count it if it is fully visible (>= 0 space remaining) or the only element in the viewport.
if (logicalViewport == 0 || DoubleUtil.GreaterThanOrClose(logicalVisibleSpace, 0.0)) { logicalViewport++; }
if (fHorizontal)
{
scrollData.SetPhysicalViewport(viewport.Width);
viewport.Width = logicalViewport;
extent.Width = logicalExtent;
offset.X = firstViewport;
offset.Y = Math.Max(0, Math.Min(offset.Y, extent.Height - viewport.Height));
}
else
{
scrollData.SetPhysicalViewport(viewport.Height);
viewport.Height = logicalViewport;
extent.Height = logicalExtent;
offset.Y = firstViewport;
offset.X = Math.Max(0, Math.Min(offset.X, extent.Width - viewport.Width));
}
// Since we can offset and clip our content, we never need to be larger than the parent suggestion.
// If we returned the full size of the content, we would always be so big we didn't need to scroll. :)
stackDesiredSize.Width = Math.Min(stackDesiredSize.Width, constraint.Width);
stackDesiredSize.Height = Math.Min(stackDesiredSize.Height, constraint.Height);
// Verify Scroll Info, invalidate ScrollOwner if necessary.
VerifyScrollingData(measureElement, scrollData, viewport, extent, offset);
}
return stackDesiredSize;
}
/// <summary>
/// Helper method which implements the stack like measure.
/// </summary>
internal static Size StackMeasureHelper(IStackMeasure measureElement, IStackMeasureScrollData scrollData, Size constraint)
{
Size stackDesiredSize = new Size();
UIElementCollection children = measureElement.InternalChildren;
Size layoutSlotSize = constraint;
bool fHorizontal = (measureElement.Orientation == Orientation.Horizontal);
int firstViewport; // First child index in the viewport.
int lastViewport = -1; // Last child index in the viewport. -1 indicates we have not yet iterated through the last child.
double logicalVisibleSpace, childLogicalSize;
//
// Initialize child sizing and iterator data
// Allow children as much size as they want along the stack.
//
if (fHorizontal)
{
layoutSlotSize.Width = Double.PositiveInfinity;
if (measureElement.IsScrolling && measureElement.CanVerticallyScroll)
{
layoutSlotSize.Height = Double.PositiveInfinity;
}
firstViewport = (measureElement.IsScrolling) ? CoerceOffsetToInteger(scrollData.Offset.X, children.Count) : 0;
logicalVisibleSpace = constraint.Width;
}
else
{
layoutSlotSize.Height = Double.PositiveInfinity;
if (measureElement.IsScrolling && measureElement.CanHorizontallyScroll)
{
layoutSlotSize.Width = Double.PositiveInfinity;
}
firstViewport = (measureElement.IsScrolling) ? CoerceOffsetToInteger(scrollData.Offset.Y, children.Count) : 0;
logicalVisibleSpace = constraint.Height;
}
//
// Iterate through children.
// While we still supported virtualization, this was hidden in a child iterator (see source history).
//
for (int i = 0, count = children.Count; i < count; ++i)
{
// Get next child.
UIElement child = children[i];
if (child == null)
{
continue;
}
// Measure the child.
child.Measure(layoutSlotSize);
Size childDesiredSize = child.DesiredSize;
// Accumulate child size.
if (fHorizontal)
{
stackDesiredSize.Width += childDesiredSize.Width;
stackDesiredSize.Height = Math.Max(stackDesiredSize.Height, childDesiredSize.Height);
childLogicalSize = childDesiredSize.Width;
}
else
{
stackDesiredSize.Width = Math.Max(stackDesiredSize.Width, childDesiredSize.Width);
stackDesiredSize.Height += childDesiredSize.Height;
childLogicalSize = childDesiredSize.Height;
}
// Adjust remaining viewport space if we are scrolling and within the viewport region.
// While scrolling (not virtualizing), we always measure children before and after the viewport.
if (measureElement.IsScrolling && lastViewport == -1 && i >= firstViewport)
{
logicalVisibleSpace -= childLogicalSize;
if (DoubleUtil.LessThanOrClose(logicalVisibleSpace, 0.0))
{
lastViewport = i;
}
}
}
//
// Compute Scrolling stuff.
//
if (measureElement.IsScrolling)
{
// Compute viewport and extent.
Size viewport = constraint;
Size extent = stackDesiredSize;
Vector offset = scrollData.Offset;
// If we have not yet set the last child in the viewport, set it to the last child.
if (lastViewport == -1)
{
lastViewport = children.Count - 1;
}
// If we or children have resized, it's possible that we can now display more content.
// This is true if we started at a nonzero offeset and still have space remaining.
// In this case, we loop back through previous children until we run out of space.
while (firstViewport > 0)
{
double projectedLogicalVisibleSpace = logicalVisibleSpace;
if (fHorizontal)
{
projectedLogicalVisibleSpace -= children[firstViewport - 1].DesiredSize.Width;
}
else
{
projectedLogicalVisibleSpace -= children[firstViewport - 1].DesiredSize.Height;
}
// If we have run out of room, break.
if (DoubleUtil.LessThan(projectedLogicalVisibleSpace, 0.0))
{
break;
}
// Adjust viewport
firstViewport--;
logicalVisibleSpace = projectedLogicalVisibleSpace;
}
int logicalExtent = children.Count;
int logicalViewport = lastViewport - firstViewport;
// We are conservative when estimating a viewport, not including the last element in case it is only partially visible.
// We want to count it if it is fully visible (>= 0 space remaining) or the only element in the viewport.
if (logicalViewport == 0 || DoubleUtil.GreaterThanOrClose(logicalVisibleSpace, 0.0))
{
logicalViewport++;
}
if (fHorizontal)
{
scrollData.SetPhysicalViewport(viewport.Width);
viewport.Width = logicalViewport;
extent.Width = logicalExtent;
offset.X = firstViewport;
offset.Y = Math.Max(0, Math.Min(offset.Y, extent.Height - viewport.Height));
}
else
{
scrollData.SetPhysicalViewport(viewport.Height);
viewport.Height = logicalViewport;
extent.Height = logicalExtent;
offset.Y = firstViewport;
offset.X = Math.Max(0, Math.Min(offset.X, extent.Width - viewport.Width));
}
// Since we can offset and clip our content, we never need to be larger than the parent suggestion.
// If we returned the full size of the content, we would always be so big we didn't need to scroll. :)
stackDesiredSize.Width = Math.Min(stackDesiredSize.Width, constraint.Width);
stackDesiredSize.Height = Math.Min(stackDesiredSize.Height, constraint.Height);
// Verify Scroll Info, invalidate ScrollOwner if necessary.
VerifyScrollingData(measureElement, scrollData, viewport, extent, offset);
}
return(stackDesiredSize);
}
// Token: 0x06005698 RID: 22168 RVA: 0x0017F0C4 File Offset: 0x0017D2C4
internal static Size StackMeasureHelper(IStackMeasure measureElement, IStackMeasureScrollData scrollData, Size constraint)
{
Size size = default(Size);
UIElementCollection internalChildren = measureElement.InternalChildren;
Size availableSize = constraint;
bool flag = measureElement.Orientation == Orientation.Horizontal;
int num = -1;
int i;
double num2;
if (flag)
{
availableSize.Width = double.PositiveInfinity;
if (measureElement.IsScrolling && measureElement.CanVerticallyScroll)
{
availableSize.Height = double.PositiveInfinity;
}
i = (measureElement.IsScrolling ? StackPanel.CoerceOffsetToInteger(scrollData.Offset.X, internalChildren.Count) : 0);
num2 = constraint.Width;
}
else
{
availableSize.Height = double.PositiveInfinity;
if (measureElement.IsScrolling && measureElement.CanHorizontallyScroll)
{
availableSize.Width = double.PositiveInfinity;
}
i = (measureElement.IsScrolling ? StackPanel.CoerceOffsetToInteger(scrollData.Offset.Y, internalChildren.Count) : 0);
num2 = constraint.Height;
}
int j = 0;
int count = internalChildren.Count;
while (j < count)
{
UIElement uielement = internalChildren[j];
if (uielement != null)
{
uielement.Measure(availableSize);
Size desiredSize = uielement.DesiredSize;
double num3;
if (flag)
{
size.Width += desiredSize.Width;
size.Height = Math.Max(size.Height, desiredSize.Height);
num3 = desiredSize.Width;
}
else
{
size.Width = Math.Max(size.Width, desiredSize.Width);
size.Height += desiredSize.Height;
num3 = desiredSize.Height;
}
if (measureElement.IsScrolling && num == -1 && j >= i)
{
num2 -= num3;
if (DoubleUtil.LessThanOrClose(num2, 0.0))
{
num = j;
}
}
}
j++;
}
if (measureElement.IsScrolling)
{
Size viewport = constraint;
Size extent = size;
Vector offset = scrollData.Offset;
if (num == -1)
{
num = internalChildren.Count - 1;
}
while (i > 0)
{
double num4 = num2;
if (flag)
{
num4 -= internalChildren[i - 1].DesiredSize.Width;
}
else
{
num4 -= internalChildren[i - 1].DesiredSize.Height;
}
if (DoubleUtil.LessThan(num4, 0.0))
{
break;
}
i--;
num2 = num4;
}
int count2 = internalChildren.Count;
int num5 = num - i;
if (num5 == 0 || DoubleUtil.GreaterThanOrClose(num2, 0.0))
{
num5++;
}
if (flag)
{
scrollData.SetPhysicalViewport(viewport.Width);
viewport.Width = (double)num5;
extent.Width = (double)count2;
offset.X = (double)i;
offset.Y = Math.Max(0.0, Math.Min(offset.Y, extent.Height - viewport.Height));
}
else
{
scrollData.SetPhysicalViewport(viewport.Height);
viewport.Height = (double)num5;
extent.Height = (double)count2;
offset.Y = (double)i;
offset.X = Math.Max(0.0, Math.Min(offset.X, extent.Width - viewport.Width));
}
size.Width = Math.Min(size.Width, constraint.Width);
size.Height = Math.Min(size.Height, constraint.Height);
StackPanel.VerifyScrollingData(measureElement, scrollData, viewport, extent, offset);
}
return(size);
}