public virtual void Initialize(ITabProvider provider)
{
Orientation = StackOrientation.Vertical;
HorizontalOptions = LayoutOptions.Center;
VerticalOptions = LayoutOptions.Center;
WidthRequest = 94;
HeightRequest = 44;
Spacing = 0;
Children.Add(TextLabel = new Label
{
Text = provider?.Title,
FontSize = 16,
HeightRequest = 42,
TextColor = Color.Black,
HorizontalTextAlignment = TextAlignment.Center,
VerticalTextAlignment = TextAlignment.Center,
VerticalOptions = LayoutOptions.Center
});
Children.Add(BottomView = new BoxView
{
HeightRequest = 2,
HorizontalOptions = LayoutOptions.Fill,
VerticalOptions = LayoutOptions.End
});
}
public void Initialize(ITabProvider provider)
{
BorderRadius = Convert.ToInt32(DotSize / 2);
HeightRequest = DotSize;
WidthRequest = DotSize;
BackgroundColor = DotColor;
//Source = provider.ImageSource;
}
/// <summary>
/// Overrides the base method to use <see cref="IconTabProviderCallback"/> if it is not null.
///
/// If it is null, or if the callback returns null, then the default implementation will be
/// used, which simply returns a new default instance of the <see cref="IconTabProvider"/>.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="adapter">The adapter.</param>
/// <returns></returns>
public override ITabProvider CreateIconTabProvider(Context context, PagerAdapter adapter)
{
ITabProvider toReturn = null;
if (_iconTabProviderCallback != null)
{
toReturn = _iconTabProviderCallback(context, adapter);
}
return(toReturn ?? base.CreateIconTabProvider(context, adapter));
}
/// <summary>
/// Creates a tab provider to be used for the given adapter.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="adapter">The adapter.</param>
/// <returns>
/// Must return an ITabProvider instance.
/// </returns>
public virtual ITabProvider CreateTabProvider(Context context, Android.Support.V4.View.PagerAdapter adapter)
{
ITabProvider tabProvider = adapter as ITabProvider;
if (tabProvider != null)
{
return(tabProvider);
}
else
{
//if the adapter supports the IIconTabProvider interface, then create
//an instance of the IconTabProvider, otherwise use the TextTabProvider.
if (adapter is PagerSlidingTabStrip.IIconTabProvider)
{
return(CreateIconTabProvider(context, adapter));
}
else
{
return(CreateTextTabProvider(context, adapter));
}
}
}
/// <summary>
/// Sets the view pager for this instance.
/// </summary>
/// <param name="pager">The pager.</param>
/// <param name="tabProviderFactory">The factory to use to select the correct tab provider for the given
/// pager, and equally as a factory for more complex tab providers to delegate to if they want to reuse
/// . This also then is set on the .</param>
/// <exception cref="System.ArgumentException">ViewPager does not have adapter instance.;pager</exception>
public void SetViewPager(ViewPager pager, TabProviderFactory tabProviderFactory = null)
{
if (pager == null)
return;
if (pager.Adapter == null)
{
throw new ArgumentException("ViewPager does not have adapter instance.", "pager");
}
//the property returns the default factory if set to null here.
_tabProviderFactory = tabProviderFactory;
//changes made here to be more tolerant of being set to the same pager or to a pager with
//the same adapter, or to the same pager with a different adapter.
if (_pager != pager)
{
if (_pager != null)
{
pager.PageScrolled -= pager_PageScrolled;
pager.PageScrollStateChanged -= pager_PageScrollStateChanged;
pager.PageSelected -= pager_PageSelected;
}
this._pager = pager;
pager.PageScrolled += pager_PageScrolled;
pager.PageScrollStateChanged += pager_PageScrollStateChanged;
pager.PageSelected += pager_PageSelected;
}
if (_adapter != pager.Adapter)
{
if (_adapter != null && _observer != null)
{
_adapter.UnregisterDataSetObserver(_observer);
}
_adapter = pager.Adapter;
_tabProviderFactory = tabProviderFactory;
//re-create the Lazys for the default text and tab providers
_textTabProvider = new Lazy<ITabProvider>(() => TabProviderFactory.CreateTextTabProvider(Context, _adapter));
_iconTabProvider = new Lazy<ITabProvider>(() => TabProviderFactory.CreateIconTabProvider(Context, _adapter));
//avoid recycling any previous views, because we've changed adapters.
_tabsContainer.RemoveAllViews();
var newProvider = TabProviderFactory.CreateTabProvider(Context, _adapter);
if (newProvider != _tabProvider && _tabProvider != null)
{
//good housekeeping
_tabProvider.TabUpdated -= _tabProvider_TabUpdated;
_tabProvider.TabUpdateRequired -= _tabProvider_TabUpdateRequired;
}
_tabProvider = newProvider;
_tabProvider.TabUpdated += _tabProvider_TabUpdated;
_tabProvider.TabUpdateRequired += _tabProvider_TabUpdateRequired;
if (_observer == null)
_observer = new PagerAdapterDataSetObserver(this);
_adapter.RegisterDataSetObserver(_observer);
}
NotifyDataSetChanged();
}
/// <summary>
/// Sets the view pager for this instance, from this the control inherits the PagerAdapter and then
/// derives the <see cref="ITabProvider"/> - unless you also pass a custom <see cref="TabProviderFactory"/>
/// in the <paramref name="tabProviderFactory"/> .
/// </summary>
/// <param name="pager">The pager.</param>
/// <param name="tabProviderFactory">The factory to use to select the correct tab provider for the given
/// pager, and equally as a factory for more complex tab providers to delegate to if they want to reuse
/// . This also then is set on the .</param>
/// <exception cref="System.ArgumentException">ViewPager does not have adapter instance.;pager</exception>
public void SetViewPager(ViewPager pager, TabProviderFactory tabProviderFactory = null)
{
if (pager == null)
{
return;
}
if (pager.Adapter == null)
{
throw new ArgumentException("ViewPager does not have adapter instance.", "pager");
}
//the property returns the default factory if set to null here.
_tabProviderFactory = tabProviderFactory;
//changes made here to be more tolerant of being set to the same pager or to a pager with
//the same adapter, or to the same pager with a different adapter.
if (_pager != pager)
{
if (_pager != null)
{
pager.PageScrolled -= pager_PageScrolled;
pager.PageScrollStateChanged -= pager_PageScrollStateChanged;
pager.PageSelected -= pager_PageSelected;
}
this._pager = pager;
pager.PageScrolled += pager_PageScrolled;
pager.PageScrollStateChanged += pager_PageScrollStateChanged;
pager.PageSelected += pager_PageSelected;
}
if (_adapter != pager.Adapter)
{
if (_adapter != null && _observer != null)
{
_adapter.UnregisterDataSetObserver(_observer);
}
_adapter = pager.Adapter;
_tabProviderFactory = tabProviderFactory;
//re-create the Lazys for the default text and tab providers
_textTabProvider = new Lazy <ITabProvider>(() => TabProviderFactory.CreateTextTabProvider(Context, _adapter));
_iconTabProvider = new Lazy <ITabProvider>(() => TabProviderFactory.CreateIconTabProvider(Context, _adapter));
//avoid recycling any previous views, because we've changed adapters.
_tabsContainer.RemoveAllViews();
var newProvider = TabProviderFactory.CreateTabProvider(Context, _adapter);
if (newProvider != _tabProvider && _tabProvider != null)
{
//good housekeeping
_tabProvider.TabUpdated -= _tabProvider_TabUpdated;
_tabProvider.TabUpdateRequired -= _tabProvider_TabUpdateRequired;
}
_tabProvider = newProvider;
_tabProvider.TabUpdated += _tabProvider_TabUpdated;
_tabProvider.TabUpdateRequired += _tabProvider_TabUpdateRequired;
if (_observer == null)
{
_observer = new PagerAdapterDataSetObserver(this);
}
_adapter.RegisterDataSetObserver(_observer);
}
NotifyDataSetChanged();
}
