private IEnumerable<ViewModel> VisitLayoutItem(ViewModel element)
{
var elementList = element.Bindable as ElementListLayout;
if (elementList != null) return RecurseElementList(elementList);
var listLayout = element.Bindable as ListLayout;
if (listLayout != null) return RecurseListLayout(listLayout);
var twoColumn = element.Bindable as TwoColumnsLayout;
if (twoColumn != null) return RecurseTwoColumnLayout(twoColumn);
return Enumerable.Empty<ViewModel>();
}
private HorizontalListLayout(IEnumerable<ViewModel> elements, int nestingDepth, HorizontalListLayout root, IElementChangeScope changeScope)
{
this.nestingDepth = nestingDepth;
this.current = elements.First();
this.hasNext = elements.Count() > 1;
this.elements = elements;
rootListLayout = root ?? this;
OwnsResizing = true;
this.changeScope = changeScope;
if (this.changeScope != null)
{
this.changeScope.CollectionChanged += ForcePropertyRequery;
}
}
/// <summary>
/// Initializes a new <see cref="ElementListLayoutWalker"/>.
/// </summary>
/// <param name="root">Root <see cref="ViewModel"/>'s bindable is expected to be one of <br/>
/// <list>
/// <item><see cref="ElementListLayout"/></item>
/// <item><see cref="ListLayout"/></item>
/// <item><see cref="TwoColumnsLayout"/></item>
/// </list>
///
/// If it is not one of these classes <see cref="ElementListLayoutWalker"/> will
/// return empty at all times.
/// </param>
public ElementListLayoutWalker(ViewModel root)
{
if (root == null) throw new ArgumentNullException("root");
this.root = root;
}
/// <summary>
/// Initializes a new instance of <see cref="TwoVerticalsLayout"/>.
/// </summary>
/// <param name="first">The first <see cref="ViewModel"/> instance.</param>
/// <param name="second">The second <see cref="ViewModel"/> instance.</param>
public TwoVerticalsLayout(ViewModel first, ViewModel second)
{
this.first = first;
this.second = second;
}
/// <summary>
/// Initializes a new instance of <see cref="ThreeVerticalVisualsLayout"/>.
/// </summary>
/// <param name="first">The first <see cref="ViewModel"/> instance.</param>
/// <param name="second">The second <see cref="ViewModel"/> instance.</param>
/// <param name="third">The third <see cref="ViewModel"/> instance.</param>
public ThreeVerticalVisualsLayout(ViewModel first, ViewModel second, ViewModel third)
:base(first, new TwoVerticalsLayout(second, third))
{
}
/// <summary>
/// Initializes a new instance of <see cref="HorizontalColumnBindingLayout"/>.
/// </summary>
/// <param name="element">The <see cref="ElementViewModel"/> isntance that should be displayed.</param>
/// <param name="columnIndex">The 0-based column index that should be used to display and resize the <paramref name="element"/>. </param>
public HorizontalColumnBindingLayout(ViewModel element, int columnIndex)
: base(element, null, columnIndex)
{
}
/// <summary>
/// Initializes a new instance of <see cref="ThreeVerticalVisualsLayout"/>.
/// </summary>
/// <param name="first">The first <see cref="ViewModel"/> instance.</param>
/// <param name="second">The second <see cref="ViewModel"/> instance.</param>
/// <param name="third">The third <see cref="ViewModel"/> instance.</param>
public ThreeVerticalVisualsLayout(ViewModel first, ViewModel second, ViewModel third)
: base(first, new TwoVerticalsLayout(second, third))
{
}
/// <summary>
/// Initializes a new instance of <see cref="TwoColumnsLayout"/>.
/// </summary>
/// <param name="left">The <see cref="ViewModel"/> instance that should be shown on the left.</param>
/// <param name="right">The <see cref="ViewModel"/> instance that should be shown on the right.</param>
/// <param name="columnIndex">The 0-based column index that should be used to display and resize the <paramref name="left"/> element. </param>
public TwoColumnsLayout(ViewModel left, ViewModel right, int columnIndex)
{
this.left = left;
this.right = right;
this.columnIndex = columnIndex;
}