protected override void OnElementChanged(ElementChangedEventArgs <Flip> e)
{
base.OnElementChanged(e);
if (e.OldElement != null)
{
e.OldElement.Children.CollectionChanged -= this.Children_CollectionChanged;
e.OldElement.NextRequired -= this.Element_NextRequired;
e.OldElement.IndexRequired -= this.Element_IndexRequired;
}
if (this.Element == null)
{
return;
}
var Root = new AW.RelativeLayout(this.Context);
this.VP = new ViewPager(this.Context);
this.VP.PageSelected += VP_PageSelected;
//如果传入的 items 是 IEnumerable 类型的 (未ToList) , 会一直去计算那个 IEnumerable , 可断点到 GetChildrenViews 里, 会一直在那里执行, 从而导致子视图不显示
this.Adapter = new FlipViewAdapter(this.VP);
Adapter.SetItems(this.GetChildrenViews().ToList());
Adapter.PosChanged += Adapter_PosChanged;
this.VP.Adapter = Adapter;
this.VP.AddOnPageChangeListener(Adapter);
Root.AddView(this.VP, LayoutParams.MatchParent, LayoutParams.MatchParent);
this.PointsContainer = new LinearLayout(this.Context);
this.PointsContainer.Orientation = Orientation.Horizontal;
var lp = new AW.RelativeLayout.LayoutParams(LayoutParams.WrapContent, 20);
lp.AddRule(LayoutRules.AlignParentBottom);
lp.AddRule(LayoutRules.CenterHorizontal);
Root.AddView(this.PointsContainer, lp);
this.SetNativeControl(Root);
if (this.Element.ShowIndicator)
{
this.SetPoints();
}
Root.Invalidate();
Root.RequestLayout();
this.Element.NextRequired += Element_NextRequired;
this.Element.IndexRequired += Element_IndexRequired;
this.Element.Children.CollectionChanged += Children_CollectionChanged;
}
protected override void Dispose(bool disposing)
{
if (disposing && !this.IsDisposed)
{
this.IsDisposed = true;
if (this.Element != null)
{
this.Element.Children.CollectionChanged -= this.Children_CollectionChanged;
this.Element.NextRequired -= this.Element_NextRequired;
this.Element.IndexRequired -= this.Element_IndexRequired;
}
if (this.VP != null)
{
this.VP.RemoveFromParent();
this.VP.Dispose();
this.VP = null;
}
if (this.Adapter != null)
{
this.Adapter.Dispose();
this.Adapter = null;
}
if (this.PointsContainer != null)
{
this.PointsContainer.RemoveFromParent();
this.PointsContainer.Dispose();
this.PointsContainer = null;
}
// Root 做为 Control ,应该由 base 释放
//if (this.Root != null) {
// this.Root.Dispose();
// this.Root = null;
//}
}
base.Dispose(disposing);
}
