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using System.Collections.Generic;
using System.Collections.Specialized;
using ElmSharp;
namespace Xamarin.Forms.Platform.Tizen.Native
{
/// <summary>
/// A Canvas provides a class which can be a container for other controls.
/// </summary>
/// <remarks>
/// This class is used as a container view for Layouts from Xamarin.Forms.Platform.Tizen framework.
/// It is used for implementing xamarin pages and layouts.
/// </remarks>
public class Canvas : Box, IContainable<EvasObject>
{
/// <summary>
/// The list of Views.
/// </summary>
readonly ObservableCollection<EvasObject> _children = new ObservableCollection<EvasObject>();
/// <summary>
/// Initializes a new instance of the <see cref="Xamarin.Forms.Platform.Tizen.Native.Canvas"/> class.
/// </summary>
/// <remarks>Canvas doesn't support replacing its children, this will be ignored.</remarks>
/// <param name="parent">Parent of this instance.</param>
public Canvas(EvasObject parent) : base(parent)
{
_children.CollectionChanged += (o, e) =>
{
if (e.Action == NotifyCollectionChangedAction.Add)
{
foreach (var v in e.NewItems)
{
var view = v as EvasObject;
if (null != view)
{
OnAdd(view);
}
}
}
else if (e.Action == NotifyCollectionChangedAction.Remove)
{
foreach (var v in e.OldItems)
{
var view = v as EvasObject;
if (null != view)
{
OnRemove(view);
}
}
}
else if (e.Action == NotifyCollectionChangedAction.Reset)
{
OnRemoveAll();
}
};
}
/// <summary>
/// Gets list of native elements that are placed in the canvas.
/// </summary>
public IList<EvasObject> Children
{
get
{
return _children;
}
}
/// <summary>
/// Provides destruction for native element and contained elements.
/// </summary>
protected override void OnUnrealize()
{
foreach (var child in _children)
{
child.Unrealize();
}
base.OnUnrealize();
}
/// <summary>
/// Adds a new child to a container.
/// </summary>
/// <param name="view">Native element which will be added</param>
void OnAdd(EvasObject view)
{
PackEnd(view);
}
/// <summary>
/// Removes a child from a container.
/// </summary>
/// <param name="view">Child element to be removed from canvas</param>
void OnRemove(EvasObject view)
{
UnPack(view);
}
/// <summary>
/// Removes all children from a canvas.
/// </summary>
void OnRemoveAll()
{
UnPackAll();
}
}
}
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