protected override Vector3 MeasureOverride(Vector3 availableSizeWithoutMargins)
{
// measure size desired by the children
var childDesiredSizeWithMargins = Vector3.Zero;
if (VisualContent != null)
{
// remove space for padding in availableSizeWithoutMargins
var childAvailableSizeWithMargins = CalculateSizeWithoutThickness(ref availableSizeWithoutMargins, ref padding);
// if the content is not scrollable perform space virtualization from the scroll viewer side.
foreach (var index in ScrollModeToDirectionIndices[ScrollMode])
{
if (ContentAsScrollInfo != null && ContentAsScrollInfo.CanScroll((Orientation)index))
{
continue;
}
childAvailableSizeWithMargins[index] = float.PositiveInfinity;
}
VisualContent.Measure(childAvailableSizeWithMargins);
childDesiredSizeWithMargins = VisualContent.DesiredSizeWithMargins;
}
// add the padding to the child desired size
var desiredSizeWithPadding = CalculateSizeWithThickness(ref childDesiredSizeWithMargins, ref padding);
return(desiredSizeWithPadding);
}
protected void switchVisualContent(VisualContent _visualContent)
{
switch (_visualContent)
{
case VisualContent.Loading:
MainGrid.Visibility = System.Windows.Visibility.Hidden;
MainGridStartup.Visibility = System.Windows.Visibility.Visible;
break;
case VisualContent.Main:
MainGridStartup.Visibility = System.Windows.Visibility.Hidden;
MainGrid.Visibility = System.Windows.Visibility.Visible;
break;
}
}
protected void switchVisualContent(VisualContent _visualContent)
{
switch (_visualContent)
{
case VisualContent.Loading:
MainGrid.Visibility = System.Windows.Visibility.Hidden;
MainGridStartup.Visibility = System.Windows.Visibility.Visible;
break;
case VisualContent.Main:
MainGridStartup.Visibility = System.Windows.Visibility.Hidden;
MainGrid.Visibility = System.Windows.Visibility.Visible;
break;
}
}
protected override Vector3 ArrangeOverride(Vector3 finalSizeWithoutMargins)
{
// calculate the remaining space for the child after having removed the padding space.
ViewPort = finalSizeWithoutMargins;
// arrange the content
if (VisualContent != null)
{
// calculate the final size given to the child (scroll view virtual size)
var childSizeWithoutPadding = CalculateSizeWithoutThickness(ref finalSizeWithoutMargins, ref padding);
foreach (var index in ScrollModeToDirectionIndices[ScrollMode])
{
if (ContentAsScrollInfo == null || !ContentAsScrollInfo.CanScroll((Orientation)index))
{
childSizeWithoutPadding[index] = Math.Max(VisualContent.DesiredSizeWithMargins[index], childSizeWithoutPadding[index]);
}
}
// arrange the child
VisualContent.Arrange(childSizeWithoutPadding, IsCollapsed);
// update the scrolling bars
UpdateScrollingBarsSize();
// update the scrolling
if (scrollingRequests.Count > 0)
{
// perform the scrolling requests
foreach (var request in scrollingRequests)
{
var scrollPosition = request.IsRelative ? ScrollOffsets - request.ScrollValue : -request.ScrollValue;
UpdateScrollOffsets(scrollPosition);
}
}
else
{
UpdateScrollOffsets(ScrollOffsets); // insures that scrolling is not out of bounds
}
// update the position of the child
UpdateVisualContentArrangeMatrix();
}
scrollingRequests.Clear();
return(finalSizeWithoutMargins);
}
protected override Vector3 ArrangeOverride(Vector3 finalSizeWithoutMargins)
{
// arrange the content
if (VisualContent != null)
{
// calculate the remaining space for the child after having removed the padding and border space.
var availableLessBorders = CalculateSizeWithoutThickness(ref finalSizeWithoutMargins, ref borderThickness);
var childSizeWithoutPadding = CalculateSizeWithoutThickness(ref availableLessBorders, ref padding);
// arrange the child
VisualContent.Arrange(childSizeWithoutPadding, IsCollapsed);
// compute the rendering offsets of the child element wrt the parent origin (0,0,0)
var childOffsets = new Vector3(padding.Left + borderThickness.Left, padding.Top + borderThickness.Top, padding.Front + borderThickness.Front) - finalSizeWithoutMargins / 2;
// set the arrange matrix of the child.
VisualContent.DependencyProperties.Set(ContentArrangeMatrixPropertyKey, Matrix.Translation(childOffsets));
}
return(finalSizeWithoutMargins);
}
