/// <summary>Scrolls to the specified coordinates and makes that part of a <see cref="T:System.Windows.Media.Visual" /> visible. </summary>
/// <param name="visual">The <see cref="T:System.Windows.Media.Visual" /> that becomes visible.</param>
/// <param name="rectangle">The <see cref="T:System.Windows.Rect" /> that represents coordinate space within a visual.</param>
/// <returns>A <see cref="T:System.Windows.Rect" /> in the coordinate space that is made visible.</returns>
// Token: 0x06005686 RID: 22150 RVA: 0x0017ED84 File Offset: 0x0017CF84
public Rect MakeVisible(Visual visual, Rect rectangle)
{
Vector vector = default(Vector);
Rect result = default(Rect);
if (rectangle.IsEmpty || visual == null || visual == this || !base.IsAncestorOf(visual))
{
return(Rect.Empty);
}
GeneralTransform generalTransform = visual.TransformToAncestor(this);
rectangle = generalTransform.TransformBounds(rectangle);
if (!this.IsScrolling)
{
return(rectangle);
}
this.MakeVisiblePhysicalHelper(rectangle, ref vector, ref result);
int childIndex = this.FindChildIndexThatParentsVisual(visual);
this.MakeVisibleLogicalHelper(childIndex, ref vector, ref result);
vector.X = ScrollContentPresenter.CoerceOffset(vector.X, this._scrollData._extent.Width, this._scrollData._viewport.Width);
vector.Y = ScrollContentPresenter.CoerceOffset(vector.Y, this._scrollData._extent.Height, this._scrollData._viewport.Height);
if (!DoubleUtil.AreClose(vector, this._scrollData._offset))
{
this._scrollData._offset = vector;
base.InvalidateMeasure();
this.OnScrollChange();
}
return(result);
}
// Token: 0x06005462 RID: 21602 RVA: 0x00175D24 File Offset: 0x00173F24
private bool CoerceOffsets()
{
Vector vector = new Vector(ScrollContentPresenter.CoerceOffset(this._scrollData._offset.X, this._scrollData._extent.Width, this._scrollData._viewport.Width), ScrollContentPresenter.CoerceOffset(this._scrollData._offset.Y, this._scrollData._extent.Height, this._scrollData._viewport.Height));
bool result = DoubleUtil.AreClose(this._scrollData._computedOffset, vector);
this._scrollData._computedOffset = vector;
return(result);
}
/// <summary>
/// StackPanel implementation of <seealso cref="IScrollInfo.MakeVisible" />.
/// </summary>
// The goal is to change offsets to bring the child into view, and return a rectangle in our space to make visible.
// The rectangle we return is in the physical dimension the input target rect transformed into our pace.
// In the logical dimension, it is our immediate child's rect.
// Note: This code presently assumes we/children are layout clean. See work item 22269 for more detail.
public Rect MakeVisible(Visual visual, Rect rectangle)
{
Vector newOffset = new Vector();
Rect newRect = new Rect();
// We can only work on visuals that are us or children.
// An empty rect has no size or position. We can't meaningfully use it.
if (rectangle.IsEmpty ||
visual == null ||
visual == (Visual)this ||
!this.IsAncestorOf(visual))
{
return(Rect.Empty);
}
#pragma warning disable 1634, 1691
#pragma warning disable 56506
// Compute the child's rect relative to (0,0) in our coordinate space.
// This is a false positive by PreSharp. visual cannot be null because of the 'if' check above
GeneralTransform childTransform = visual.TransformToAncestor(this);
#pragma warning restore 56506
#pragma warning restore 1634, 1691
rectangle = childTransform.TransformBounds(rectangle);
// We can't do any work unless we're scrolling.
if (!IsScrolling)
{
return(rectangle);
}
// Bring the target rect into view in the physical dimension.
MakeVisiblePhysicalHelper(rectangle, ref newOffset, ref newRect);
// Bring our child containing the visual into view.
int childIndex = FindChildIndexThatParentsVisual(visual);
MakeVisibleLogicalHelper(childIndex, ref newOffset, ref newRect);
// We have computed the scrolling offsets; validate and scroll to them.
newOffset.X = ScrollContentPresenter.CoerceOffset(newOffset.X, _scrollData._extent.Width, _scrollData._viewport.Width);
newOffset.Y = ScrollContentPresenter.CoerceOffset(newOffset.Y, _scrollData._extent.Height, _scrollData._viewport.Height);
if (!DoubleUtil.AreClose(newOffset, _scrollData._offset))
{
_scrollData._offset = newOffset;
InvalidateMeasure();
OnScrollChange();
}
// Return the rectangle
return(newRect);
}