private void SetTransition(TabPageView tab)
{
var behavior = TabViewAnimationTypeFactory.GetBehavior(this.TransitionType);
behavior.SetBinding(SelectChangeBehaviorBase.IsSelectedProperty, new Binding("IsSelected", BindingMode.TwoWay, source: tab));
tab.Content.Behaviors.Add(behavior);
}
private void UpdateSelected(TabPageView o)
{
if (o == null)
{
return;
}
this.IsInnerUpdate = true;
var item = (TabPageView)o;
if (item.Index == this.SelectedIndex &&
item.BindingContext != null &&
item.BindingContext.Equals(this.SelectedItem))
{
return;
}
if (this.CurrentTabPage != null)
{
this.CurrentTabPage.IsSelected = false;
this.NotifySelected(this.CurrentTabPage.BindingContext, false);
}
item.IsSelected = true;
if (item.BindingContext != null && !item.BindingContext.Equals(this.SelectedItem))
{
this.SelectedItem = item.BindingContext;
}
this.NotifySelected(item.BindingContext, true);
if (item.Index != this.SelectedIndex)
{
this.SelectedIndex = item.Index;
}
this.CurrentTabPage = item;
//IOS下,必须加上这一句,否则会导至 item 不可操作
this.PageContainer.RaiseChild(item);
this.IsInnerUpdate = false;
}
/// <summary>
///
/// </summary>
/// <param name="data"></param>
/// <param name="idx"></param>
/// <returns></returns>
private TabPageView GetTab(object data, int idx)
{
TabPageView item;
if (data is TabPageView)
{
item = (TabPageView)data;
}
else
{
item = new TabPageView()
{
Index = idx,
BindingContext = data
};
#region headView
View headView = null;
if (this.TabTemplate != null || this.TabTemplateSelector != null)
{
//优先使用 TemplateSelector
if (this.TabTemplateSelector != null)
{
// SelectTemplate 的第二个参数，即 TemplateSelector 的 OnSelectTemplate 方法的 container 参数
headView = (View)this.TabTemplateSelector.SelectTemplate(data, item).CreateContent();
}
else if (this.TabTemplate != null)
{
headView = (View)this.TabTemplate.CreateContent();
}
if (headView != null)
{
//上下文
headView.BindingContext = data;
}
}
if (headView == null)
{
headView = new Label()
{
Text = "Tab"
}
}
;
//item.Header = headView;
item.Header = new ContentView()
{
Content = headView,
BindingContext = item
};
//添加手势
TapBinder.SetCmd(headView, this.TabSelectedCmd);
TapBinder.SetParam(headView, item);
#endregion
#region bodyView
View bodyView = null;
if (this.ItemTemplate != null || this.ItemTemplateSelector != null)
{
if (this.ItemTemplateSelector != null)
{
bodyView = (View)this.ItemTemplateSelector.SelectTemplate(data, item).CreateContent();
}
else if (this.ItemTemplate != null)
{
bodyView = (View)this.ItemTemplate.CreateContent();
}
if (bodyView != null)
{
bodyView.BindingContext = data;
}
}
if (bodyView == null)
{
bodyView = new Label()
{
Text = "Body"
}
}
;
item.Content = bodyView;
#endregion
}
item.Header.SetBinding(ContentView.ControlTemplateProperty, new Binding(nameof(this.TabControlTemplate), source: this));
item.Header.SetBinding(View.WidthRequestProperty, new Binding("TabWidthRequest", source: this));
item.Header.SetBinding(View.HeightRequestProperty, new Binding("TabHeightRequest", source: this));
item.SetBinding(TabPageView.TabPositionProperty, new Binding(nameof(TabPosition), source: this));
this.SetTransition(item);
return(item);
}
