/// <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();
}