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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.
//
// Description: ListParagraph represents collection of list items.
//
#pragma warning disable 1634, 1691 // avoid generating warnings about unknown
// message numbers and unknown pragmas for PRESharp contol
using System;
using System.Diagnostics;
using System.Windows;
using System.Windows.Documents;
using MS.Internal.Text;
namespace MS.Internal.PtsHost
{
/// <summary>
/// ListParagraph represents collection of list items.
/// </summary>
internal sealed class ListParagraph : ContainerParagraph
{
/// <summary>
/// Constructor.
/// </summary>
/// <param name="element">
/// Element associated with paragraph.
/// </param>
/// <param name="structuralCache">
/// Content's structural cache
/// </param>
internal ListParagraph(DependencyObject element, StructuralCache structuralCache)
: base(element, structuralCache)
{
}
/// <summary>
/// CreateParaclient
/// </summary>
/// <param name="paraClientHandle">
/// OUT: opaque to PTS paragraph client
/// </param>
internal override void CreateParaclient(
out IntPtr paraClientHandle)
{
#pragma warning disable 6518
// Disable PRESharp warning 6518. ListParaClient is an UnmamangedHandle, that adds itself
// to HandleMapper that holds a reference to it. PTS manages lifetime of this object, and
// calls DestroyParaclient to get rid of it. DestroyParaclient will call Dispose() on the object
// and remove it from HandleMapper.
ListParaClient paraClient = new ListParaClient(this);
paraClientHandle = paraClient.Handle;
#pragma warning restore 6518
}
/// <summary>
/// Determine paragraph type at the current TextPointer and
/// create it. Only ListItem elements are considered. Any other
/// content is skipped.
/// </summary>
/// <param name="textPointer">
/// TextPointer at which paragraph is to be created
/// </param>
/// <param name="fEmptyOk">
/// True if empty paragraph is acceptable
/// </param>
/// <returns>
/// BaseParagraph that was created
/// </returns>
protected override BaseParagraph GetParagraph(ITextPointer textPointer, bool fEmptyOk)
{
Invariant.Assert(textPointer is TextPointer);
BaseParagraph paragraph = null;
while (paragraph == null)
{
TextPointerContext runType = textPointer.GetPointerContext(LogicalDirection.Forward);
if (runType == TextPointerContext.ElementStart)
{
TextElement element = ((TextPointer)textPointer).GetAdjacentElementFromOuterPosition(LogicalDirection.Forward);
if (element is ListItem)
{
// Need to handle visibility collapsed.
//Visibility visibility = Retriever.Visibility(treePtr.CPPtr.Element);
//if (visibility != Visibility.Collapsed)
//{
// para = new
//}
//else skip the element
paragraph = new ListItemParagraph(element, StructuralCache);
break;
}
else if (element is List)
{
// Need to handle visibility collapsed.
//Visibility visibility = Retriever.Visibility(treePtr.CPPtr.Element);
//if (visibility != Visibility.Collapsed)
//{
// para = new
//}
//else skip the element
paragraph = new ListParagraph(element, StructuralCache);
break;
}
// Skip all elements, which are not valid list item children
if (((TextPointer)textPointer).IsFrozen)
{
// Need to clone TextPointer before moving it.
textPointer = textPointer.CreatePointer();
}
textPointer.MoveToPosition(element.ElementEnd);
}
else if (runType == TextPointerContext.ElementEnd)
{
// End of list, if the same as Owner of associated element
// Skip content otherwise
if (Element == ((TextPointer)textPointer).Parent)
{
break;
}
if (((TextPointer)textPointer).IsFrozen)
{
// Need to clone TextPointer before moving it.
textPointer = textPointer.CreatePointer();
}
textPointer.MoveToNextContextPosition(LogicalDirection.Forward);
}
else
{
// Skip content
if (((TextPointer)textPointer).IsFrozen)
{
// Need to clone TextPointer before moving it.
textPointer = textPointer.CreatePointer();
}
textPointer.MoveToNextContextPosition(LogicalDirection.Forward);
}
}
if (paragraph != null)
{
StructuralCache.CurrentFormatContext.DependentMax = (TextPointer)textPointer;
}
return paragraph;
}
}
}
#pragma warning enable 1634, 1691
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