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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#region Using declarations
using System.Windows.Controls.Primitives;
using System.Windows.Media;
using MS.Internal;
#if RIBBON_IN_FRAMEWORK
using Microsoft.Windows.Controls;
#if RIBBON_IN_FRAMEWORK
namespace System.Windows.Controls.Ribbon.Primitives
#else
namespace Microsoft.Windows.Controls.Ribbon.Primitives
#endif
{
#endif
#endregion
public class RibbonTabsPanel : Panel, IScrollInfo
{
#region Protected Methods
/// <summary>
/// Measures the children
/// </summary>
protected override Size MeasureOverride(Size availableSize)
{
UIElementCollection children = InternalChildren;
int childCount = children.Count;
Size returnSize = new Size();
for (int i = 0; i < childCount; i++)
{
children[i].Measure(availableSize);
Size childSize = children[i].DesiredSize;
returnSize = new Size(Math.Max(returnSize.Width, childSize.Width), Math.Max(returnSize.Height, childSize.Height));
}
return returnSize;
}
/// <summary>
/// Arranges the children
/// </summary>
protected override Size ArrangeOverride(Size finalSize)
{
UIElementCollection children = InternalChildren;
int childCount = children.Count;
for (int i = 0; i < childCount; i++)
{
children[i].Arrange(new Rect(0, 0, finalSize.Width, finalSize.Height));
}
return finalSize;
}
#endregion
#region Private Members
private Ribbon Ribbon
{
get
{
if (_ribbon == null)
{
_ribbon = TreeHelper.FindTemplatedAncestor<Ribbon>(this);
}
return _ribbon;
}
}
private Ribbon _ribbon;
#endregion
#region IScrollInfo Members
public ScrollViewer ScrollOwner
{
get { return ScrollData._scrollOwner; }
set { ScrollData._scrollOwner = value; }
}
public void SetHorizontalOffset(double offset)
{
double newValue = ValidateInputOffset(offset, "HorizontalOffset");
if (!DoubleUtil.AreClose(ScrollData._offsetX, newValue))
{
_scrollData._offsetX = newValue;
InvalidateMeasure();
}
}
public double ExtentWidth
{
get { return ScrollData._extentWidth; }
}
public double HorizontalOffset
{
get { return ScrollData._offsetX; }
}
public double ViewportWidth
{
get { return ScrollData._viewportWidth; }
}
public void LineLeft()
{
SetHorizontalOffset(HorizontalOffset - 16.0);
}
public void LineRight()
{
SetHorizontalOffset(HorizontalOffset + 16.0);
}
// This is optimized for horizontal scrolling only
public Rect MakeVisible(Visual visual, Rect rectangle)
{
// 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;
}
// Compute the child's rect relative to (0,0) in our coordinate space.
GeneralTransform childTransform = visual.TransformToAncestor(this);
rectangle = childTransform.TransformBounds(rectangle);
// Initialize the viewport
Rect viewport = new Rect(HorizontalOffset, rectangle.Top, ViewportWidth, rectangle.Height);
rectangle.X += viewport.X;
// Compute the offsets required to minimally scroll the child maximally into view.
double minX = ComputeScrollOffsetWithMinimalScroll(viewport.Left, viewport.Right, rectangle.Left, rectangle.Right);
// We have computed the scrolling offsets; scroll to them.
double originalOffset = ScrollData._offsetX;
SetHorizontalOffset(minX);
if (!DoubleUtil.AreClose(originalOffset, ScrollData._offsetX))
{
OnScrollChange();
}
// Compute the visible rectangle of the child relative to the viewport.
viewport.X = minX;
rectangle.Intersect(viewport);
rectangle.X -= viewport.X;
// Return the rectangle
return rectangle;
}
private void OnScrollChange()
{
if (ScrollOwner != null) { ScrollOwner.InvalidateScrollInfo(); }
}
internal static double ComputeScrollOffsetWithMinimalScroll(
double topView,
double bottomView,
double topChild,
double bottomChild)
{
// # CHILD POSITION CHILD SIZE SCROLL REMEDY
// 1 Above viewport <= viewport Down Align top edge of child & viewport
// 2 Above viewport > viewport Down Align bottom edge of child & viewport
// 3 Below viewport <= viewport Up Align bottom edge of child & viewport
// 4 Below viewport > viewport Up Align top edge of child & viewport
// 5 Entirely within viewport NA No scroll.
// 6 Spanning viewport NA No scroll.
//
// Note: "Above viewport" = childTop above viewportTop, childBottom above viewportBottom
// "Below viewport" = childTop below viewportTop, childBottom below viewportBottom
// These child thus may overlap with the viewport, but will scroll the same direction
bool fAbove = DoubleUtil.LessThan(topChild, topView) && DoubleUtil.LessThan(bottomChild, bottomView);
bool fBelow = DoubleUtil.GreaterThan(bottomChild, bottomView) && DoubleUtil.GreaterThan(topChild, topView);
bool fLarger = (bottomChild - topChild) > (bottomView - topView);
// Handle Cases: 1 & 4 above
if ((fAbove && !fLarger)
|| (fBelow && fLarger))
{
return topChild;
}
// Handle Cases: 2 & 3 above
else if (fAbove || fBelow)
{
return bottomChild - (bottomView - topView);
}
// Handle cases: 5 & 6 above.
return topView;
}
// Does not support other scrolling than LineLeft/LineRight
public void MouseWheelDown()
{
}
public void MouseWheelLeft()
{
}
public void MouseWheelRight()
{
}
public void MouseWheelUp()
{
}
public void LineDown()
{
}
public void LineUp()
{
}
public void PageDown()
{
}
public void PageLeft()
{
}
public void PageRight()
{
}
public void PageUp()
{
}
public void SetVerticalOffset(double offset)
{
}
public bool CanVerticallyScroll
{
get { return false; }
set { }
}
public bool CanHorizontallyScroll
{
get { return true; }
set { }
}
public double ExtentHeight
{
get { return 0.0; }
}
public double VerticalOffset
{
get { return 0.0; }
}
public double ViewportHeight
{
get { return 0.0; }
}
private ScrollData ScrollData
{
get
{
return _scrollData ?? (_scrollData = new ScrollData());
}
}
private ScrollData _scrollData;
internal static double ValidateInputOffset(double offset, string parameterName)
{
if (double.IsNaN(offset))
{
throw new ArgumentOutOfRangeException(parameterName);
}
return Math.Max(0.0, offset);
}
#endregion
}
//-----------------------------------------------------------
// ScrollData class
//-----------------------------------------------------------
#region ScrollData
// Helper class to hold scrolling data.
// This class exists to reduce working set when SCP is delegating to another implementation of ISI.
// Standard "extra pointer always for less data sometimes" cache savings model:
internal class ScrollData
{
internal ScrollViewer _scrollOwner;
internal double _offsetX;
internal double _viewportWidth; // ViewportSize is computed from our FinalSize, but may be in different units.
internal double _extentWidth; // Extent is the total size of our content.
}
#endregion ScrollData
}
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