private Size GetScaledImageSize(Size givenSize)
{
ImageSource source = this.Source;
if (source == null)
{
return(new Size());
}
Size contentSize = source.Size;
Vector scale = Viewbox.ComputeScaleFactor(givenSize, contentSize, this.Stretch, this.StretchDirection);
return(new Size(contentSize.Width * scale.X, contentSize.Height * scale.Y));
}
/// <summary>
/// Content arrangement.
/// </summary>
/// <param name="finalSize">The final size that element should use to arrange itself and its children.</param>
protected override sealed Size ArrangeOverride(Size finalSize)
{
Transform pageTransform;
ScaleTransform pageScaleTransform;
Visual pageVisual;
Size pageSize, pageZoom;
CheckDisposed();
if (_pageVisualClone == null)
{
if (_pageHost == null)
{
_pageHost = new DocumentPageHost();
this.AddVisualChild(_pageHost);
}
Invariant.Assert(_pageHost != null);
pageVisual = (_documentPage == null) ? null : _documentPage.Visual;
if (pageVisual == null)
{
// Remove existing visiual children.
_pageHost.PageVisual = null;
// Reset offset and transform on the page host before Arrange
_pageHost.CachedOffset = new Point();
_pageHost.RenderTransform = null;
// Size for the page host needs to be set to finalSize
_pageHost.Arrange(new Rect(_pageHost.CachedOffset, finalSize));
}
else
{
// Add visual representing the page contents. For performance reasons
// first check if it is already insered there.
if (_pageHost.PageVisual != pageVisual)
{
// There might be a case where a visual associated with a page was
// inserted to a visual tree before. It got removed later, but GC did not
// destroy its parent yet. To workaround this case always check for the parent
// of page visual and disconnect it, when necessary.
DocumentPageHost.DisconnectPageVisual(pageVisual);
_pageHost.PageVisual = pageVisual;
}
// Compute transform to be applied to the page visual. First take into account
// mirroring transform, if necessary. Apply also scaling transform.
pageSize = _documentPage.Size;
pageTransform = Transform.Identity;
// DocumentPage.Visual is always LeftToRight, so if the current
// FlowDirection is RightToLeft, need to unmirror the child visual.
if (FlowDirection == FlowDirection.RightToLeft)
{
pageTransform = new MatrixTransform(-1.0, 0.0, 0.0, 1.0, pageSize.Width, 0.0);
}
// Apply zooming
if (!DoubleUtil.IsOne(_pageZoom))
{
pageScaleTransform = new ScaleTransform(_pageZoom, _pageZoom);
if (pageTransform == Transform.Identity)
{
pageTransform = pageScaleTransform;
}
else
{
pageTransform = new MatrixTransform(pageTransform.Value * pageScaleTransform.Value);
}
pageSize = new Size(pageSize.Width * _pageZoom, pageSize.Height * _pageZoom);
}
// Apply stretch properties
pageZoom = Viewbox.ComputeScaleFactor(finalSize, pageSize, this.Stretch, this.StretchDirection);
if (!DoubleUtil.IsOne(pageZoom.Width) || !DoubleUtil.IsOne(pageZoom.Height))
{
pageScaleTransform = new ScaleTransform(pageZoom.Width, pageZoom.Height);
if (pageTransform == Transform.Identity)
{
pageTransform = pageScaleTransform;
}
else
{
pageTransform = new MatrixTransform(pageTransform.Value * pageScaleTransform.Value);
}
pageSize = new Size(pageSize.Width * pageZoom.Width, pageSize.Height * pageZoom.Height);
}
// Set offset and transform on the page host before Arrange
_pageHost.CachedOffset = new Point((finalSize.Width - pageSize.Width) / 2, (finalSize.Height - pageSize.Height) / 2);
_pageHost.RenderTransform = pageTransform;
// Arrange pagehost to original size of the page.
_pageHost.Arrange(new Rect(_pageHost.CachedOffset, _documentPage.Size));
}
// Fire sync notification if new page was connected.
if (_newPageConnected)
{
OnPageConnected();
}
// Transform for the page has been changed, need to notify TextView about the changes.
OnTransformChangedAsync();
}
else
{
if (_pageHost.PageVisual != _pageVisualClone)
{
// Remove existing visiual children.
_pageHost.PageVisual = _pageVisualClone;
// Size for the page host needs to be set to finalSize
// Use previous offset and transform
_pageHost.Arrange(new Rect(_pageHost.CachedOffset, finalSize));
}
}
return(base.ArrangeOverride(finalSize));
}
/// <summary>Arranges the content to fit a specified view size.</summary>
/// <param name="finalSize">The maximum size that the page view should use to arrange itself and its children.</param>
/// <returns>The actual size that the page view used to arrange itself and its children.</returns>
// Token: 0x06005D78 RID: 23928 RVA: 0x001A4EA8 File Offset: 0x001A30A8
protected sealed override Size ArrangeOverride(Size finalSize)
{
this.CheckDisposed();
if (this._pageVisualClone == null)
{
if (this._pageHost == null)
{
this._pageHost = new DocumentPageHost();
base.AddVisualChild(this._pageHost);
}
Invariant.Assert(this._pageHost != null);
Visual visual = (this._documentPage == null) ? null : this._documentPage.Visual;
if (visual == null)
{
this._pageHost.PageVisual = null;
this._pageHost.CachedOffset = default(Point);
this._pageHost.RenderTransform = null;
this._pageHost.Arrange(new Rect(this._pageHost.CachedOffset, finalSize));
}
else
{
if (this._pageHost.PageVisual != visual)
{
DocumentPageHost.DisconnectPageVisual(visual);
this._pageHost.PageVisual = visual;
}
Size size = this._documentPage.Size;
Transform transform = Transform.Identity;
if (base.FlowDirection == FlowDirection.RightToLeft)
{
transform = new MatrixTransform(-1.0, 0.0, 0.0, 1.0, size.Width, 0.0);
}
if (!DoubleUtil.IsOne(this._pageZoom))
{
ScaleTransform scaleTransform = new ScaleTransform(this._pageZoom, this._pageZoom);
if (transform == Transform.Identity)
{
transform = scaleTransform;
}
else
{
transform = new MatrixTransform(transform.Value * scaleTransform.Value);
}
size = new Size(size.Width * this._pageZoom, size.Height * this._pageZoom);
}
Size size2 = Viewbox.ComputeScaleFactor(finalSize, size, this.Stretch, this.StretchDirection);
if (!DoubleUtil.IsOne(size2.Width) || !DoubleUtil.IsOne(size2.Height))
{
ScaleTransform scaleTransform = new ScaleTransform(size2.Width, size2.Height);
if (transform == Transform.Identity)
{
transform = scaleTransform;
}
else
{
transform = new MatrixTransform(transform.Value * scaleTransform.Value);
}
size = new Size(size.Width * size2.Width, size.Height * size2.Height);
}
this._pageHost.CachedOffset = new Point((finalSize.Width - size.Width) / 2.0, (finalSize.Height - size.Height) / 2.0);
this._pageHost.RenderTransform = transform;
this._pageHost.Arrange(new Rect(this._pageHost.CachedOffset, this._documentPage.Size));
}
if (this._newPageConnected)
{
this.OnPageConnected();
}
this.OnTransformChangedAsync();
}
else if (this._pageHost.PageVisual != this._pageVisualClone)
{
this._pageHost.PageVisual = this._pageVisualClone;
this._pageHost.Arrange(new Rect(this._pageHost.CachedOffset, finalSize));
}
return(base.ArrangeOverride(finalSize));
}
/// <summary>
/// Content measurement.
/// </summary>
/// <param name="availableSize">Available size that parent can give to the child. This is soft constraint.</param>
/// <returns>The DocumentPageView's desired size.</returns>
protected override sealed Size MeasureOverride(Size availableSize)
{
Size newPageSize, pageZoom;
Size pageSize;
Size desiredSize = new Size(); // If no page is available, return (0,0) as size.
CheckDisposed();
if (_suspendLayout)
{
desiredSize = this.DesiredSize;
}
else if (_documentPaginator != null)
{
// Reflow content if needed.
if (ShouldReflowContent())
{
// Reflow is disabled when dealing with infinite size in both directions.
// If only one dimention is infinte, calculate value based on PageSize of the
// document and Stretching properties.
if (!Double.IsInfinity(availableSize.Width) || !Double.IsInfinity(availableSize.Height))
{
pageSize = _documentPaginator.PageSize;
if (Double.IsInfinity(availableSize.Width))
{
newPageSize = new Size();
newPageSize.Height = availableSize.Height / _pageZoom;
newPageSize.Width = newPageSize.Height * (pageSize.Width / pageSize.Height); // Keep aspect ratio.
}
else if (Double.IsInfinity(availableSize.Height))
{
newPageSize = new Size();
newPageSize.Width = availableSize.Width / _pageZoom;
newPageSize.Height = newPageSize.Width * (pageSize.Height / pageSize.Width); // Keep aspect ratio.
}
else
{
newPageSize = new Size(availableSize.Width / _pageZoom, availableSize.Height / _pageZoom);
}
if (!DoubleUtil.AreClose(pageSize, newPageSize))
{
_documentPaginator.PageSize = newPageSize;
}
}
}
// If the main page or pending async page are not available yet,
// asynchronously request new page from Paginator.
if (_documentPage == null && _documentPageAsync == null)
{
if (PageNumber >= 0)
{
if (_useAsynchronous)
{
_documentPaginator.GetPageAsync(PageNumber, this);
}
else
{
_documentPageAsync = _documentPaginator.GetPage(PageNumber);
if (_documentPageAsync == null)
{
_documentPageAsync = DocumentPage.Missing;
}
}
}
else
{
_documentPage = DocumentPage.Missing;
}
}
// If pending async page is available, discard the main page and
// set _documentPage to _documentPageAsync.
if (_documentPageAsync != null)
{
// Do cleanup for currently used page, because it gets replaced.
DisposeCurrentPage();
// DisposeCurrentPage raises PageDisposed and DocumentPage.PageDestroyed events.
// Handlers for those events may dispose _documentPageAsync. Treat this situation
// as missing page.
if (_documentPageAsync == null)
{
_documentPageAsync = DocumentPage.Missing;
}
if (_pageVisualClone != null)
{
RemoveDuplicateVisual();
}
// Replace the main page with cached async page.
_documentPage = _documentPageAsync;
if (_documentPage != DocumentPage.Missing)
{
_documentPage.PageDestroyed += new EventHandler(HandlePageDestroyed);
_documentPageAsync.PageDestroyed -= new EventHandler(HandleAsyncPageDestroyed);
}
_documentPageAsync = null;
// Set a flag that will indicate that a PageConnected must be fired in
// ArrangeOverride
_newPageConnected = true;
}
// If page is available, return its size as desired size.
if (_documentPage != null && _documentPage != DocumentPage.Missing)
{
pageSize = new Size(_documentPage.Size.Width * _pageZoom, _documentPage.Size.Height * _pageZoom);
pageZoom = Viewbox.ComputeScaleFactor(availableSize, pageSize, this.Stretch, this.StretchDirection);
desiredSize = new Size(pageSize.Width * pageZoom.Width, pageSize.Height * pageZoom.Height);
}
if (_pageVisualClone != null)
{
desiredSize = _visualCloneSize;
}
}
return(desiredSize);
}
/// <summary>Returns the available viewport size that can be given to display the current <see cref="P:System.Windows.Controls.Primitives.DocumentPageView.DocumentPage" />.</summary>
/// <param name="availableSize">The maximum available size.</param>
/// <returns>The actual desired size.</returns>
// Token: 0x06005D77 RID: 23927 RVA: 0x001A4BDC File Offset: 0x001A2DDC
protected sealed override Size MeasureOverride(Size availableSize)
{
Size result = default(Size);
this.CheckDisposed();
if (this._suspendLayout)
{
result = base.DesiredSize;
}
else if (this._documentPaginator != null)
{
if (this.ShouldReflowContent() && (!double.IsInfinity(availableSize.Width) || !double.IsInfinity(availableSize.Height)))
{
Size pageSize = this._documentPaginator.PageSize;
Size size;
if (double.IsInfinity(availableSize.Width))
{
size = default(Size);
size.Height = availableSize.Height / this._pageZoom;
size.Width = size.Height * (pageSize.Width / pageSize.Height);
}
else if (double.IsInfinity(availableSize.Height))
{
size = default(Size);
size.Width = availableSize.Width / this._pageZoom;
size.Height = size.Width * (pageSize.Height / pageSize.Width);
}
else
{
size = new Size(availableSize.Width / this._pageZoom, availableSize.Height / this._pageZoom);
}
if (!DoubleUtil.AreClose(pageSize, size))
{
this._documentPaginator.PageSize = size;
}
}
if (this._documentPage == null && this._documentPageAsync == null)
{
if (this.PageNumber >= 0)
{
if (this._useAsynchronous)
{
this._documentPaginator.GetPageAsync(this.PageNumber, this);
}
else
{
this._documentPageAsync = this._documentPaginator.GetPage(this.PageNumber);
if (this._documentPageAsync == null)
{
this._documentPageAsync = DocumentPage.Missing;
}
}
}
else
{
this._documentPage = DocumentPage.Missing;
}
}
if (this._documentPageAsync != null)
{
this.DisposeCurrentPage();
if (this._documentPageAsync == null)
{
this._documentPageAsync = DocumentPage.Missing;
}
if (this._pageVisualClone != null)
{
this.RemoveDuplicateVisual();
}
this._documentPage = this._documentPageAsync;
if (this._documentPage != DocumentPage.Missing)
{
this._documentPage.PageDestroyed += this.HandlePageDestroyed;
this._documentPageAsync.PageDestroyed -= this.HandleAsyncPageDestroyed;
}
this._documentPageAsync = null;
this._newPageConnected = true;
}
if (this._documentPage != null && this._documentPage != DocumentPage.Missing)
{
Size pageSize = new Size(this._documentPage.Size.Width * this._pageZoom, this._documentPage.Size.Height * this._pageZoom);
Size size2 = Viewbox.ComputeScaleFactor(availableSize, pageSize, this.Stretch, this.StretchDirection);
result = new Size(pageSize.Width * size2.Width, pageSize.Height * size2.Height);
}
if (this._pageVisualClone != null)
{
result = this._visualCloneSize;
}
}
return(result);
}
