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 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 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 OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (Element == null || viewPager == null)
{
return;
}
var rect = this.Element.Bounds;
switch (e.PropertyName)
{
case "Orientation":
orientationChanged = true;
SetNativeView();
Element.SendPositionSelected();
Element.PositionSelectedCommand?.Execute(null);
break;
case "BackgroundColor":
viewPager.SetBackgroundColor(Element.BackgroundColor.ToAndroid());
break;
case "IsSwipeEnabled":
SetIsSwipeEnabled();
break;
case "IndicatorsTintColor":
indicators?.SetFillColor(Element.IndicatorsTintColor.ToAndroid());
break;
case "CurrentPageIndicatorTintColor":
indicators?.SetPageColor(Element.CurrentPageIndicatorTintColor.ToAndroid());
break;
case "IndicatorsShape":
indicators?.SetStyle((int)Element.IndicatorsShape);
break;
case "ShowIndicators":
SetIndicators();
break;
case "ItemsSource":
SetPosition();
viewPager.Adapter = new PageAdapter(Element);
viewPager.SetCurrentItem(Element.Position, false);
SetArrowsVisibility();
indicators?.SetViewPager(viewPager);
Element.SendPositionSelected();
Element.PositionSelectedCommand?.Execute(null);
if (Element.ItemsSource != null && Element.ItemsSource is INotifyCollectionChanged)
{
((INotifyCollectionChanged)Element.ItemsSource).CollectionChanged += ItemsSource_CollectionChanged;
}
break;
case "ItemTemplate":
viewPager.Adapter = new PageAdapter(Element);
viewPager.SetCurrentItem(Element.Position, false);
indicators?.SetViewPager(viewPager);
Element.SendPositionSelected();
Element.PositionSelectedCommand?.Execute(null);
break;
case "Position":
if (!isChangingPosition)
{
SetCurrentPage(Element.Position);
}
break;
case "ShowArrows":
SetArrows();
break;
case "ArrowsBackgroundColor":
if (prevBtn == null || nextBtn == null)
{
return;
}
prevBtn.SetBackgroundColor(Element.ArrowsBackgroundColor.ToAndroid());
nextBtn.SetBackgroundColor(Element.ArrowsBackgroundColor.ToAndroid());
break;
case "ArrowsTintColor":
var prevArrow = nativeView.FindViewById <AWidget.ImageView>(Resource.Id.prevArrow);
prevArrow.SetColorFilter(Element.ArrowsTintColor.ToAndroid());
var nextArrow = nativeView.FindViewById <AWidget.ImageView>(Resource.Id.nextArrow);
nextArrow.SetColorFilter(Element.ArrowsTintColor.ToAndroid());
break;
case "ArrowsTransparency":
if (prevBtn == null || nextBtn == null)
{
return;
}
prevBtn.Alpha = Element.ArrowsTransparency;
nextBtn.Alpha = Element.ArrowsTransparency;
break;
}
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
var rect = this.Element.Bounds;
switch (e.PropertyName)
{
case "Orientation":
if (Element != null)
{
orientationChanged = true;
SetNativeView();
Element.PositionSelected?.Invoke(Element, Element.Position);
}
break;
case "InterPageSpacing":
//var metrics = Resources.DisplayMetrics;
//var interPageSpacing = Element.InterPageSpacing * metrics.Density;
//viewPager.PageMargin = (int)interPageSpacing;
break;
case "BackgroundColor":
viewPager?.SetBackgroundColor(Element.BackgroundColor.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":
SetIndicators();
break;
case "ItemsSource":
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);
if (Element.ItemsSource != null && Element.ItemsSource is INotifyCollectionChanged)
{
((INotifyCollectionChanged)Element.ItemsSource).CollectionChanged += ItemsSource_CollectionChanged;
}
}
break;
case "ItemTemplate":
if (Element != null && viewPager != null)
{
viewPager.Adapter = new PageAdapter(Element);
viewPager.SetCurrentItem(Element.Position, false);
indicators?.SetViewPager(viewPager);
Element.PositionSelected?.Invoke(Element, Element.Position);
}
break;
case "Position":
if (Element != null && !isSwiping)
{
SetCurrentPage(Element.Position);
}
break;
}
}
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;
}
}
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;
viewPager.SetBackgroundColor(Element.InterPageSpacingColor.ToAndroid());
indicator = nativeView.FindViewById <CirclePageIndicator>(Resource.Id.indicator);
indicator.SetViewPager(viewPager);
indicator.SetPageColor(Element.PageIndicatorTintColor.ToAndroid());
indicator.SetFillColor(Element.CurrentPageIndicatorTintColor.ToAndroid());
indicator.SetStyle(Element.IndicatorsShape); // Rounded or Squared
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);
}
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
var rect = this.Element.Bounds;
switch (e.PropertyName)
{
case "Orientation":
if (Element != null)
{
orientationChanged = true;
SetNativeView();
Element.SendPositionSelected();
Element.PositionSelectedCommand?.Execute(null);
}
break;
case "InterPageSpacing":
//var metrics = Resources.DisplayMetrics;
//var interPageSpacing = Element.InterPageSpacing * metrics.Density;
//viewPager.PageMargin = (int)interPageSpacing;
break;
case "BackgroundColor":
viewPager?.SetBackgroundColor(Element.BackgroundColor.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":
SetIndicators();
break;
case "ItemsSource":
if (Element != null && viewPager != null)
{
SetPosition();
viewPager.Adapter = new PageAdapter(Element);
viewPager.SetCurrentItem(Element.Position, false);
indicators?.SetViewPager(viewPager);
Element.SendPositionSelected();
Element.PositionSelectedCommand?.Execute(null);
if (Element.ItemsSource != null && Element.ItemsSource is INotifyCollectionChanged)
{
((INotifyCollectionChanged)Element.ItemsSource).CollectionChanged += ItemsSource_CollectionChanged;
}
}
break;
case "ItemTemplate":
if (Element != null && viewPager != null)
{
viewPager.Adapter = new PageAdapter(Element);
viewPager.SetCurrentItem(Element.Position, false);
indicators?.SetViewPager(viewPager);
Element.SendPositionSelected();
Element.PositionSelectedCommand?.Execute(null);
}
break;
case "Position":
if (Element != null && !isSwiping)
{
if (prevBtn != null)
{
prevBtn.Visibility = Element.Position == 0 ? AViews.ViewStates.Gone : AViews.ViewStates.Visible;
}
if (nextBtn != null)
{
nextBtn.Visibility = Element.Position == Element.ItemsSource.GetCount() - 1 ? AViews.ViewStates.Gone : AViews.ViewStates.Visible;
}
SetCurrentPage(Element.Position);
}
break;
case "ShowArrows":
SetArrows();
break;
case "ArrowsBackgroundColor":
if (prevBtn != null && nextBtn != null)
{
prevBtn.SetBackgroundColor(Element.ArrowsBackgroundColor.ToAndroid());
nextBtn.SetBackgroundColor(Element.ArrowsBackgroundColor.ToAndroid());
}
break;
case "ArrowsTintColor":
if (prevBtn != null && nextBtn != null)
{
var prevArrow = nativeView.FindViewById <AWidget.ImageView>(Resource.Id.prevArrow);
prevArrow.SetColorFilter(Element.ArrowsTintColor.ToAndroid());
var nextArrow = nativeView.FindViewById <AWidget.ImageView>(Resource.Id.nextArrow);
nextArrow.SetColorFilter(Element.ArrowsTintColor.ToAndroid());
}
break;
}
}