| public SetViewPager ( ViewPager view ) : void | ||
| view | ViewPager | |
| Результат | void | |
async void ItemsSource_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
// NewItems contains the item that was added.
// If NewStartingIndex is not -1, then it contains the index where the new item was added.
if (e.Action == NotifyCollectionChangedAction.Add)
{
InsertPage(Element?.ItemsSource.GetItem(e.NewStartingIndex), e.NewStartingIndex);
}
// OldItems contains the item that was removed.
// If OldStartingIndex is not -1, then it contains the index where the old item was removed.
if (e.Action == NotifyCollectionChangedAction.Remove)
{
await RemovePage(e.OldStartingIndex);
}
// OldItems contains the moved item.
// OldStartingIndex contains the index where the item was moved from.
// NewStartingIndex contains the index where the item was moved to.
if (e.Action == NotifyCollectionChangedAction.Move)
{
var Source = ((PageAdapter)viewPager?.Adapter).Source;
if (Element != null && viewPager != null && Source != null)
{
Source.RemoveAt(e.OldStartingIndex);
Source.Insert(e.NewStartingIndex, e.OldItems[e.OldStartingIndex]);
viewPager.Adapter?.NotifyDataSetChanged();
Element.PositionSelected?.Invoke(Element, Element.Position);
}
}
// NewItems contains the replacement item.
// NewStartingIndex and OldStartingIndex are equal, and if they are not -1,
// then they contain the index where the item was replaced.
if (e.Action == NotifyCollectionChangedAction.Replace)
{
var Source = ((PageAdapter)viewPager?.Adapter).Source;
if (Element != null && viewPager != null && Source != null)
{
Source[e.OldStartingIndex] = e.NewItems[e.NewStartingIndex];
viewPager.Adapter?.NotifyDataSetChanged();
}
}
// No other properties are valid.
if (e.Action == NotifyCollectionChangedAction.Reset)
{
if (Element != null && viewPager != null)
{
SetPosition();
viewPager.Adapter = new PageAdapter(Element);
viewPager.SetCurrentItem(Element.Position, false);
indicators?.SetViewPager(viewPager);
Element.PositionSelected?.Invoke(Element, Element.Position);
}
}
}
void SetIndicators()
{
if (Element.ShowIndicators)
{
SetPosition();
indicators.SetViewPager(viewPager);
// IndicatorsTintColor BP
indicators.SetFillColor(Element.IndicatorsTintColor.ToAndroid());
// CurrentPageIndicatorTintColor BP
indicators.SetPageColor(Element.CurrentPageIndicatorTintColor.ToAndroid());
// IndicatorsShape BP
indicators.SetStyle(Element.IndicatorsShape); // Rounded or Squared
}
else
{
indicators.RemoveAllViews();
}
// ShowIndicators BP
indicators.Visibility = Element.ShowIndicators ? AViews.ViewStates.Visible : AViews.ViewStates.Gone;
}
void SetIndicators()
{
if (Element.ShowIndicators)
{
SetPosition();
indicators.SetViewPager(viewPager);
// IndicatorsTintColor BP
indicators.SetFillColor(Element.IndicatorsTintColor.ToAndroid());
// CurrentPageIndicatorTintColor BP
indicators.SetPageColor(Element.CurrentPageIndicatorTintColor.ToAndroid());
// IndicatorsShape BP
indicators.SetStyle(Element.IndicatorsShape); // Rounded or Squared
var layoutParams = new global::Android.Widget.RelativeLayout.LayoutParams(global::Android.Widget.RelativeLayout.LayoutParams.MatchParent, global::Android.Widget.RelativeLayout.LayoutParams.WrapContent);
layoutParams.AddRule(Element.IndicatorLocation == IndicatorLocation.Top ? global::Android.Widget.LayoutRules.AlignParentTop : global::Android.Widget.LayoutRules.AlignParentBottom);
indicators.LayoutParameters = layoutParams;
}
else
{
indicators.RemoveAllViews();
}
// ShowIndicators BP
indicators.Visibility = Element.ShowIndicators? AViews.ViewStates.Visible : AViews.ViewStates.Gone;
}
void SetNativeView()
{
var inflater = AViews.LayoutInflater.From(Forms.Context);
// Orientation BP
if (Element.Orientation == CarouselViewOrientation.Horizontal)
{
nativeView = inflater.Inflate(Resource.Layout.horizontal_viewpager, null);
}
else
{
nativeView = inflater.Inflate(Resource.Layout.vertical_viewpager, null);
}
viewPager = nativeView.FindViewById <ViewPager>(Resource.Id.pager);
viewPager.Adapter = new PageAdapter(Element);
viewPager.SetCurrentItem(Element.Position, false);
// InterPageSpacing BP
var metrics = Resources.DisplayMetrics;
var interPageSpacing = Element.InterPageSpacing * metrics.Density;
viewPager.PageMargin = (int)interPageSpacing;
// InterPageSpacingColor BP
viewPager.SetBackgroundColor(Element.InterPageSpacingColor.ToAndroid());
// IsSwipingEnabled BP
SetIsSwipingEnabled();
// INDICATORS
indicators = nativeView.FindViewById <CirclePageIndicator>(Resource.Id.indicator);
SetPosition();
indicators.SetViewPager(viewPager);
// IndicatorsTintColor BP
indicators.SetFillColor(Element.IndicatorsTintColor.ToAndroid());
// CurrentPageIndicatorTintColor BP
indicators.SetPageColor(Element.CurrentPageIndicatorTintColor.ToAndroid());
// IndicatorsShape BP
indicators.SetStyle(Element.IndicatorsShape); // Rounded or Squared
// ShowIndicators BP
indicators.Visibility = Element.ShowIndicators ? AViews.ViewStates.Visible : AViews.ViewStates.Gone;
viewPager.PageSelected += ViewPager_PageSelected;
viewPager.PageScrollStateChanged += ViewPager_PageScrollStateChanged;
SetNativeControl(nativeView);
}
protected override void OnElementChanged(ElementChangedEventArgs <CarouselViewControl> e)
{
base.OnElementChanged(e);
if (Control == null)
{
// Instantiate the native control and assign it to the Control property with
// the SetNativeControl method
var inflater = AViews.LayoutInflater.From(Forms.Context);
if (Element.Orientation == Orientation.Horizontal)
{
nativeView = inflater.Inflate(Resource.Layout.viewpager, null);
}
else
{
nativeView = inflater.Inflate(Resource.Layout.vertical_viewpager, null);
}
var metrics = Resources.DisplayMetrics;
var interPageSpacing = Element.InterPageSpacing * metrics.Density;
viewPager = nativeView.FindViewById <ViewPager>(Resource.Id.pager);
viewPager.PageMargin = (int)interPageSpacing;
indicator = nativeView.FindViewById <CirclePageIndicator>(Resource.Id.indicator);
indicator.SetViewPager(viewPager);
indicator.SetPageColor(Element.PageIndicatorTintColor.ToAndroid());
indicator.SetFillColor(Element.CurrentPageIndicatorTintColor.ToAndroid());
indicator.Visibility = Element.ShowIndicators ? AViews.ViewStates.Visible : AViews.ViewStates.Gone;
SetNativeControl(nativeView);
}
if (e.OldElement != null)
{
// Unsubscribe from event handlers and cleanup any resources
if (viewPager != null)
{
viewPager.PageSelected -= ViewPager_PageSelected;
viewPager.PageScrollStateChanged -= ViewPager_PageScrollStateChanged;
}
if (Element != null)
{
Element.RemoveAction = null;
Element.InsertAction = null;
Element.SetCurrentAction = null;
}
}
if (e.NewElement != null)
{
// Configure the control and subscribe to event handlers
viewPager.PageSelected += ViewPager_PageSelected;
viewPager.PageScrollStateChanged += ViewPager_PageScrollStateChanged;
Element.RemoveAction = new Action <int>(RemoveItem);
Element.InsertAction = new Action <object, int>(InsertItem);
Element.SetCurrentAction = new Action <int>(SetCurrentItem);
}
}
async void ItemsSource_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
// NewItems contains the item that was added.
// If NewStartingIndex is not -1, then it contains the index where the new item was added.
if (e.Action == NotifyCollectionChangedAction.Add)
{
InsertPage(Element?.ItemsSource.GetItem(e.NewStartingIndex), e.NewStartingIndex);
}
// OldItems contains the item that was removed.
// If OldStartingIndex is not -1, then it contains the index where the old item was removed.
if (e.Action == NotifyCollectionChangedAction.Remove)
{
await RemovePage(e.OldStartingIndex);
}
// OldItems contains the moved item.
// OldStartingIndex contains the index where the item was moved from.
// NewStartingIndex contains the index where the item was moved to.
if (e.Action == NotifyCollectionChangedAction.Move)
{
// Fix for #168 Android NullReferenceException
var Source = ((PageAdapter)viewPager?.Adapter)?.Source;
if (Element == null || viewPager == null || viewPager?.Adapter == null || Source == null)
{
return;
}
Source.RemoveAt(e.OldStartingIndex);
Source.Insert(e.NewStartingIndex, e.OldItems[e.OldStartingIndex]);
viewPager.Adapter?.NotifyDataSetChanged();
SetArrowsVisibility();
Element.SendPositionSelected();
Element.PositionSelectedCommand?.Execute(null);
}
// NewItems contains the replacement item.
// NewStartingIndex and OldStartingIndex are equal, and if they are not -1,
// then they contain the index where the item was replaced.
if (e.Action == NotifyCollectionChangedAction.Replace)
{
// Fix for #168 Android NullReferenceException
var Source = ((PageAdapter)viewPager?.Adapter)?.Source;
if (Element == null || viewPager == null || viewPager?.Adapter == null || Source == null)
{
return;
}
Source[e.OldStartingIndex] = e.NewItems[e.NewStartingIndex];
viewPager.Adapter?.NotifyDataSetChanged();
}
// No other properties are valid.
if (e.Action == NotifyCollectionChangedAction.Reset)
{
if (Element == null || viewPager == null)
{
return;
}
SetPosition();
viewPager.Adapter = new PageAdapter(Element);
viewPager.SetCurrentItem(Element.Position, false);
SetArrowsVisibility();
indicators?.SetViewPager(viewPager);
Element.SendPositionSelected();
Element.PositionSelectedCommand?.Execute(null);
}
}
async void ItemsSource_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
// NewItems contains the item that was added.
// If NewStartingIndex is not -1, then it contains the index where the new item was added.
if (e.Action == NotifyCollectionChangedAction.Add)
{
InsertPage(Element?.ItemsSource.GetItem(e.NewStartingIndex), e.NewStartingIndex);
}
// OldItems contains the item that was removed.
// If OldStartingIndex is not -1, then it contains the index where the old item was removed.
if (e.Action == NotifyCollectionChangedAction.Remove)
{
await RemovePageAsync(e.OldStartingIndex);
}
// OldItems contains the moved item.
// OldStartingIndex contains the index where the item was moved from.
// NewStartingIndex contains the index where the item was moved to.
if (e.Action == NotifyCollectionChangedAction.Move)
{
// Fix for #168 Android NullReferenceException
var Source = ((PageAdapter)viewPager?.Adapter)?.Source;
if (Element != null && viewPager != null && viewPager?.Adapter != null && Source != null)
{
/*
* System.IndexOutOfRangeException: Index has to be between upper and lower bound of the array.
* I/MonoDroid(24479): at System.Array.GetValue (System.Int32 index) [0x00037] in <896ad1d315ca4ba7b117efb8dacaedcf>:0
* I/MonoDroid(24479): at System.Array.System.Collections.IList.get_Item (System.Int32 index) [0x00000] in <896ad1d315ca4ba7b117efb8dacaedcf>:0
* I/MonoDroid(24479): at System.Collections.ArrayList+ReadOnlyList.get_Item (System.Int32 index) [0x00000] in <896ad1d315ca4ba7b117efb8dacaedcf>:0
* I/MonoDroid(24479): at CarouselView.FormsPlugin.Android.CarouselViewRenderer+<ItemsSource_CollectionChanged>d__6.MoveNext () [0x0018c] in .\CarouselView\CarouselView.FormsPlugin.Android\CarouselViewImplementation.cs:114
*/
//Source.RemoveAt(e.OldStartingIndex);
//Source.Insert(e.NewStartingIndex, e.OldItems[e.OldStartingIndex]);
//viewPager.Adapter?.NotifyDataSetChanged();
//Element.SendPositionSelected();
var maxIndex = Source.Count - 1;
if (e.OldStartingIndex >= 0 && e.OldStartingIndex <= maxIndex &&
e.NewStartingIndex >= 0 && e.NewStartingIndex <= maxIndex)
{
var item = Source.ElementAtOrDefault(e.OldStartingIndex);
if (item != null)
{
await RemovePageAsync(e.OldStartingIndex, false);
InsertPage(item, e.NewStartingIndex);
await SetCurrentPageAsync(e.NewStartingIndex);
Element.SendPositionSelected();
}
}
}
}
// NewItems contains the replacement item.
// NewStartingIndex and OldStartingIndex are equal, and if they are not -1,
// then they contain the index where the item was replaced.
if (e.Action == NotifyCollectionChangedAction.Replace)
{
// Fix for #168 Android NullReferenceException
var Source = ((PageAdapter)viewPager?.Adapter)?.Source;
if (Element != null && viewPager != null && viewPager?.Adapter != null && Source != null)
{
Source[e.OldStartingIndex] = e.NewItems[e.NewStartingIndex];
viewPager.Adapter?.NotifyDataSetChanged();
}
}
// No other properties are valid.
if (e.Action == NotifyCollectionChangedAction.Reset)
{
if (Element != null && viewPager != null)
{
SetPosition();
viewPager.Adapter = new PageAdapter(Element);
viewPager.SetCurrentItem(Element.Position, false);
indicators?.SetViewPager(viewPager);
Element.SendPositionSelected();
}
}
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
var rect = this.Element.Bounds;
switch (e.PropertyName)
{
case "Renderer":
// Fix for NullReferenceException on Android tabbed page #59
if (!Element.Height.Equals(-1))
{
SetNativeView();
Element.PositionSelected?.Invoke(Element, EventArgs.Empty);
}
break;
case "Width":
//ElementWidth = rect.Width;
break;
case "Height":
// To avoid calling ConfigureViewPager twice on launch;
if (ElementHeight.Equals(0))
{
ElementHeight = rect.Height;
SetNativeView();
Element.PositionSelected?.Invoke(Element, EventArgs.Empty);
}
break;
case "Orientation":
SetNativeView();
Element.PositionSelected?.Invoke(Element, EventArgs.Empty);
break;
case "InterPageSpacing":
//var metrics = Resources.DisplayMetrics;
//var interPageSpacing = Element.InterPageSpacing * metrics.Density;
//viewPager.PageMargin = (int)interPageSpacing;
break;
case "InterPageSpacingColor":
viewPager?.SetBackgroundColor(Element.InterPageSpacingColor.ToAndroid());
break;
case "IsSwipingEnabled":
SetIsSwipingEnabled();
break;
case "IndicatorsTintColor":
indicators?.SetFillColor(Element.IndicatorsTintColor.ToAndroid());
break;
case "CurrentPageIndicatorTintColor":
indicators?.SetPageColor(Element.CurrentPageIndicatorTintColor.ToAndroid());
break;
case "IndicatorsShape":
indicators?.SetStyle(Element.IndicatorsShape);
break;
case "ShowIndicators":
if (indicators != null)
{
indicators.Visibility = Element.ShowIndicators ? AViews.ViewStates.Visible : AViews.ViewStates.Gone;
}
break;
case "ItemsSource":
if (viewPager != null)
{
SetPosition();
viewPager.Adapter = new PageAdapter(Element);
viewPager.SetCurrentItem(Element.Position, false);
indicators?.SetViewPager(viewPager);
Element.PositionSelected?.Invoke(Element, EventArgs.Empty);
if (Element.ItemsSource != null && Element.ItemsSource is INotifyCollectionChanged)
{
((INotifyCollectionChanged)Element.ItemsSource).CollectionChanged += ItemsSource_CollectionChanged;
}
}
break;
case "ItemTemplate":
if (viewPager != null)
{
viewPager.Adapter = new PageAdapter(Element);
viewPager.SetCurrentItem(Element.Position, false);
indicators?.SetViewPager(viewPager);
Element.PositionSelected?.Invoke(Element, EventArgs.Empty);
}
break;
case "Position":
if (!isSwiping)
{
SetCurrentPage(Element.Position);
}
break;
}
}