/// ScrollEventArgs is a class to record scroll event arguments which will sent to user.
/// </summary>
/// <since_tizen> 8 </since_tizen>
+ [global::System.Diagnostics.CodeAnalysis.SuppressMessage("Design", "CA1001: Types that own disposable fields should be disposable.", Justification = "Scroll event is temporarily used for notifying scroll position update, so position will not be disposed during the event processing.")]
public class ScrollEventArgs : EventArgs
{
+ // Position class is derived class of Disposable class and they will be implicitly disposed by DisposeQueue,
+ // so that there will be no memory leak.
private Position position;
private Position scrollPosition;
/// This class provides a View that can scroll a single View with a layout. This View can be a nest of Views.
/// </summary>
/// <since_tizen> 8 </since_tizen>
- public class ScrollableBase : Control
+ public partial class ScrollableBase : Control
{
static bool LayoutDebugScrollableBase = false; // Debug flag
+ static bool focusDebugScrollableBase = false; // Debug flag
private Direction mScrollingDirection = Direction.Vertical;
private bool mScrollEnabled = true;
private int mScrollDuration = 125;
private int mPageWidth = 0;
private float mPageFlickThreshold = 0.4f;
private float mScrollingEventThreshold = 0.001f;
+ private bool fadeScrollbar = true;
private class ScrollableBaseCustomLayout : AbsoluteLayout
{
{
get
{
+ return (Direction)GetValue(ScrollingDirectionProperty);
+ }
+ set
+ {
+ SetValue(ScrollingDirectionProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private Direction InternalScrollingDirection
+ {
+ get
+ {
return mScrollingDirection;
}
set
{
get
{
+ return (bool)GetValue(ScrollEnabledProperty);
+ }
+ set
+ {
+ SetValue(ScrollEnabledProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private bool InternalScrollEnabled
+ {
+ get
+ {
return mScrollEnabled;
}
set
/// Default is false.
/// </summary>
/// <since_tizen> 8 </since_tizen>
- public bool SnapToPage { set; get; } = false;
+ public bool SnapToPage
+ {
+ get
+ {
+ return (bool)GetValue(SnapToPageProperty);
+ }
+ set
+ {
+ SetValue(SnapToPageProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private bool InternalSnapToPage { set; get; } = false;
/// <summary>
/// Get current page.
/// <since_tizen> 8 </since_tizen>
public int ScrollDuration
{
+ get
+ {
+ return (int)GetValue(ScrollDurationProperty);
+ }
+ set
+ {
+ SetValue(ScrollDurationProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private int InternalScrollDuration
+ {
set
{
mScrollDuration = value >= 0 ? value : mScrollDuration;
/// Scroll Available area.
/// </summary>
/// <since_tizen> 8 </since_tizen>
- public Vector2 ScrollAvailableArea { set; get; }
+ public Vector2 ScrollAvailableArea
+ {
+ get
+ {
+ return GetValue(ScrollAvailableAreaProperty) as Vector2;
+ }
+ set
+ {
+ SetValue(ScrollAvailableAreaProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private Vector2 InternalScrollAvailableArea { set; get; }
/// <summary>
/// An event emitted when user starts dragging ScrollableBase, user can subscribe or unsubscribe to this event handler.<br />
{
get
{
+ return GetValue(ScrollbarProperty) as ScrollbarBase;
+ }
+ set
+ {
+ SetValue(ScrollbarProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private ScrollbarBase InternalScrollbar
+ {
+ get
+ {
return scrollBar;
}
set
{
get
{
+ return (bool)GetValue(HideScrollbarProperty);
+ }
+ set
+ {
+ SetValue(HideScrollbarProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private bool InternalHideScrollbar
+ {
+ get
+ {
return hideScrollbar;
}
set
else
{
scrollBar.Show();
+ if (fadeScrollbar)
+ {
+ scrollBar.Opacity = 1.0f;
+ scrollBar.FadeOut();
+ }
+ }
+ }
+ }
+ }
+
+ /// <summary>
+ /// The boolean flag for automatic fading Scrollbar.
+ /// Scrollbar will be faded out when scroll stay in certain position longer than the threshold.
+ /// Scrollbar will be faded in scroll position changes.
+ /// </summary>
+ [EditorBrowsable(EditorBrowsableState.Never)]
+ public bool FadeScrollbar
+ {
+ get => (bool)GetValue(FadeScrollbarProperty);
+ set => SetValue(FadeScrollbarProperty, value);
+ }
+
+ private bool InternalFadeScrollbar
+ {
+ get
+ {
+ return fadeScrollbar;
+ }
+ set
+ {
+ fadeScrollbar = value;
+
+ if (scrollBar != null && !hideScrollbar)
+ {
+ if (value)
+ {
+ scrollBar.FadeOut();
+ }
+ else
+ {
+ scrollBar.Opacity = 1.0f;
+ // Removing fadeout timer and animation.
+ scrollBar.FadeIn();
}
}
}
{
get
{
+ return GetValue(LayoutProperty) as LayoutItem;
+ }
+ set
+ {
+ SetValue(LayoutProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private LayoutItem InternalLayout
+ {
+ get
+ {
return ContentContainer.Layout;
}
set
{
get
{
+ return (float)GetValue(DecelerationRateProperty);
+ }
+ set
+ {
+ SetValue(DecelerationRateProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private float InternalDecelerationRate
+ {
+ get
+ {
return decelerationRate;
}
set
/// Threshold not to go infinite at the end of scrolling animation.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
- public float DecelerationThreshold { get; set; } = 0.1f;
+ public float DecelerationThreshold
+ {
+ get
+ {
+ return (float)GetValue(DecelerationThresholdProperty);
+ }
+ set
+ {
+ SetValue(DecelerationThresholdProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private float InternalDecelerationThreshold { get; set; } = 0.1f;
/// <summary>
/// Scrolling event will be thrown when this amount of scroll position is changed.
{
get
{
+ return (float)GetValue(ScrollingEventThresholdProperty);
+ }
+ set
+ {
+ SetValue(ScrollingEventThresholdProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private float InternalScrollingEventThreshold
+ {
+ get
+ {
return mScrollingEventThreshold;
}
set
{
get
{
+ return (float)GetValue(PageFlickThresholdProperty);
+ }
+ set
+ {
+ SetValue(PageFlickThresholdProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private float InternalPageFlickThreshold
+ {
+ get
+ {
return mPageFlickThreshold;
}
set
{
get
{
+ return GetValue(PaddingProperty) as Extents;
+ }
+ set
+ {
+ SetValue(PaddingProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private Extents InternalPadding
+ {
+ get
+ {
return ContentContainer.Padding;
}
set
/// Alphafunction for scroll animation.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
- public AlphaFunction ScrollAlphaFunction { get; set; } = new AlphaFunction(AlphaFunction.BuiltinFunctions.Linear);
+ public AlphaFunction ScrollAlphaFunction
+ {
+ get
+ {
+ return GetValue(ScrollAlphaFunctionProperty) as AlphaFunction;
+ }
+ set
+ {
+ SetValue(ScrollAlphaFunctionProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private AlphaFunction InternalScrollAlphaFunction { get; set; } = new AlphaFunction(AlphaFunction.BuiltinFunctions.Linear);
private bool hideScrollbar = true;
private float maxScrollDistance;
// Let's consider more whether this needs to be set as protected.
public float NoticeAnimationEndBeforePosition
{
+ get
+ {
+ return (float)GetValue(NoticeAnimationEndBeforePositionProperty);
+ }
+ set
+ {
+ SetValue(NoticeAnimationEndBeforePositionProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private float InternalNoticeAnimationEndBeforePosition
+ {
get => noticeAnimationEndBeforePosition;
set => noticeAnimationEndBeforePosition = value;
}
+ /// <summary>
+ /// Step scroll move distance.
+ /// Key focus originally moves focusable objects, but in ScrollableBase,
+ /// if focusable object is too far or un-exist and ScrollableBase is focusable,
+ /// it can scroll move itself by key input.
+ /// this value decide how long distance will it moves in one step.
+ /// if any value is not set, step will be moved quater size of ScrollableBase length.
+ /// </summary>
+ [EditorBrowsable(EditorBrowsableState.Never)]
+ public float StepScrollDistance
+ {
+ get
+ {
+ return (float)GetValue(StepScrollDistanceProperty);
+ }
+ set
+ {
+ SetValue(StepScrollDistanceProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private float stepScrollDistance = 0f;
+
+ /// <summary>
+ /// Wheel scroll move distance.
+ /// This value decide how long distance will it moves in wheel event.
+ /// </summary>
+ [EditorBrowsable(EditorBrowsableState.Never)]
+ public float WheelScrollDistance
+ {
+ get
+ {
+ return (float)GetValue(WheelScrollDistanceProperty);
+ }
+ set
+ {
+ SetValue(WheelScrollDistanceProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private float wheelScrollDistance = 50f;
+
+
// Let's consider more whether this needs to be set as protected.
private float finalTargetPosition;
private bool isOverShootingShadowShown = false;
private float startShowShadowDisplacement;
- /// <summary>
- /// Default Constructor
- /// </summary>
- /// <since_tizen> 8 </since_tizen>
- public ScrollableBase() : base()
+ private void Initialize()
{
DecelerationRate = 0.998f;
WidthSpecification = ScrollingDirection == Direction.Vertical ? LayoutParamPolicies.MatchParent : LayoutParamPolicies.WrapContent,
HeightSpecification = ScrollingDirection == Direction.Vertical ? LayoutParamPolicies.WrapContent : LayoutParamPolicies.MatchParent,
};
+ // Check if children's sizes change to update Scrollbar
ContentContainer.Relayout += OnScrollingChildRelayout;
propertyNotification = ContentContainer.AddPropertyNotification("position", PropertyCondition.Step(mScrollingEventThreshold));
propertyNotification.Notified += OnPropertyChanged;
base.Add(ContentContainer);
+ // Check if ScrollableBase's size changes to update Scrollbar
+ base.Relayout += OnScrollingChildRelayout;
Scrollbar = new Scrollbar();
PivotPoint = NUI.PivotPoint.CenterRight,
};
+ WheelEvent += OnWheelEvent;
+
AccessibilityManager.Instance.SetAccessibilityAttribute(this, AccessibilityManager.AccessibilityAttribute.Trait, "ScrollableBase");
+
+ SetKeyboardNavigationSupport(true);
+ }
+
+ /// <summary>
+ /// Default Constructor
+ /// </summary>
+ /// <since_tizen> 8 </since_tizen>
+ public ScrollableBase() : base()
+ {
+ Initialize();
+ }
+
+ /// <summary>
+ /// Creates a new instance of a ScrollableBase with style.
+ /// </summary>
+ /// <param name="style">Creates ScrollableBase by special style defined in UX.</param>
+ [EditorBrowsable(EditorBrowsableState.Never)]
+ public ScrollableBase(string style) : base(style)
+ {
+ Initialize();
+ }
+
+ /// <summary>
+ /// Creates a new instance of a ScrollableBase with style.
+ /// </summary>
+ /// <param name="style">A style applied to the newly created ScrollableBase.</param>
+ [EditorBrowsable(EditorBrowsableState.Never)]
+ public ScrollableBase(ControlStyle style) : base(style)
+ {
+ Initialize();
}
private bool OnInterruptTouchingChildTouched(object source, View.TouchEventArgs args)
}
}
- previousContainerSize = ContentContainer.Size;
- previousSize = Size;
+ previousContainerSize = new Size(ContentContainer.Size);
+ previousSize = new Size(Size);
}
private bool ReviseContainerPositionIfNeed()
float viewportLength = isHorizontal ? Size.Width : Size.Height;
float currentPosition = isHorizontal ? ContentContainer.CurrentPosition.X : ContentContainer.CurrentPosition.Y;
Scrollbar.Update(contentLength, viewportLength, -currentPosition);
+
+ if (!hideScrollbar && fadeScrollbar)
+ {
+ Scrollbar.FadeOut();
+ }
}
}
AnimateChildTo(ScrollDuration, -targetPosition);
}
+ internal void ScrollToChild(View child, bool anim = false)
+ {
+ if (null == FindDescendantByID(child.ID)) return;
+
+ bool isHorizontal = (ScrollingDirection == Direction.Horizontal);
+
+ float viewScreenPosition = (isHorizontal ? ScreenPosition.X : ScreenPosition.Y);
+ float childScreenPosition = (isHorizontal ? child.ScreenPosition.X : child.ScreenPosition.Y);
+ float scrollPosition = (isHorizontal ? ScrollPosition.X : ScrollPosition.Y);
+ float viewSize = (isHorizontal ? SizeWidth : SizeHeight);
+ float childSize = (isHorizontal ? child.SizeWidth : child.SizeHeight);
+
+ if (viewScreenPosition > childScreenPosition ||
+ viewScreenPosition + viewSize < childScreenPosition + childSize)
+ {// if object is outside
+ float targetPosition;
+ float dist = viewScreenPosition - childScreenPosition;
+ if (dist > 0)
+ {// if object is upper side
+ targetPosition = scrollPosition - dist;
+ }
+ else
+ {// if object is down side
+ targetPosition = scrollPosition - dist + childSize - viewSize;
+ }
+ ScrollTo(targetPosition, anim);
+ }
+ }
+
private void OnScrollDragStarted()
{
ScrollEventArgs eventArgs = new ScrollEventArgs(ContentContainer.CurrentPosition);
ScrollDragStarted?.Invoke(this, eventArgs);
+ EmitScrollStartedEvent();
+
+ if (!hideScrollbar && fadeScrollbar)
+ {
+ scrollBar?.FadeIn();
+ }
}
private void OnScrollDragEnded()
{
ScrollEventArgs eventArgs = new ScrollEventArgs(ContentContainer.CurrentPosition);
ScrollDragEnded?.Invoke(this, eventArgs);
+ EmitScrollFinishedEvent();
+
+ if (!hideScrollbar && fadeScrollbar)
+ {
+ scrollBar?.FadeOut();
+ }
}
private void OnScrollAnimationStarted()
{
ScrollEventArgs eventArgs = new ScrollEventArgs(ContentContainer.CurrentPosition);
ScrollAnimationStarted?.Invoke(this, eventArgs);
+ EmitScrollStartedEvent();
+
+ if (!hideScrollbar && fadeScrollbar)
+ {
+ scrollBar?.FadeIn();
+ }
}
private void OnScrollAnimationEnded()
ScrollEventArgs eventArgs = new ScrollEventArgs(ContentContainer.CurrentPosition);
ScrollAnimationEnded?.Invoke(this, eventArgs);
+ EmitScrollFinishedEvent();
+
+ if (!hideScrollbar && fadeScrollbar)
+ {
+ scrollBar?.FadeOut();
+ }
}
private void OnScroll()
return;
}
+ StopOverShootingShadowAnimation();
+ StopScroll();
+
if (type == DisposeTypes.Explicit)
{
- StopOverShootingShadowAnimation();
- StopScroll();
+ mPanGestureDetector?.Dispose();
+ mPanGestureDetector = null;
- if (mPanGestureDetector != null)
- {
- mPanGestureDetector.Detected -= OnPanGestureDetected;
- mPanGestureDetector.Dispose();
- mPanGestureDetector = null;
- }
+ ContentContainer?.RemovePropertyNotification(propertyNotification);
+ propertyNotification?.Dispose();
+ propertyNotification = null;
+ }
+
+ WheelEvent -= OnWheelEvent;
+
+ if (type == DisposeTypes.Explicit)
+ {
- propertyNotification.Dispose();
}
base.Dispose(type);
}
/// Enable/Disable overshooting effect. default is disabled.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
- public bool EnableOverShootingEffect { get; set; } = false;
+ public bool EnableOverShootingEffect
+ {
+ get
+ {
+ return (bool)GetValue(EnableOverShootingEffectProperty);
+ }
+ set
+ {
+ SetValue(EnableOverShootingEffectProperty, value);
+ NotifyPropertyChanged();
+ }
+ }
+ private bool InternalEnableOverShootingEffect { get; set; } = false;
private void AttachOverShootingShadowView()
{
private void OnPanGestureDetected(object source, PanGestureDetector.DetectedEventArgs e)
{
- OnPanGesture(e.PanGesture);
- if(!((SnapToPage && scrollAnimation != null && scrollAnimation.State == Animation.States.Playing) || e.PanGesture.State == Gesture.StateType.Started))
- {
- e.Handled = !((int)finalTargetPosition == 0 || -(int)finalTargetPosition == (int)maxScrollDistance);
- }
+ e.Handled = OnPanGesture(e.PanGesture);
}
- private void OnPanGesture(PanGesture panGesture)
+ private bool OnPanGesture(PanGesture panGesture)
{
+ bool handled = true;
if (SnapToPage && scrollAnimation != null && scrollAnimation.State == Animation.States.Playing)
{
- return;
+ return handled;
}
-
if (panGesture.State == Gesture.StateType.Started)
{
readyToNotice = false;
- //Interrupt touching when panning is started
- this.InterceptTouchEvent += OnInterruptTouchingChildTouched;
AttachOverShootingShadowView();
Debug.WriteLineIf(LayoutDebugScrollableBase, "Gesture Start");
if (scrolling && !SnapToPage)
StopScroll();
}
totalDisplacementForPan = 0.0f;
+
+ // check if gesture need to propagation
+ var checkDisplacement = (ScrollingDirection == Direction.Horizontal) ? panGesture.Displacement.X : panGesture.Displacement.Y;
+ var checkChildCurrentPosition = (ScrollingDirection == Direction.Horizontal) ? ContentContainer.PositionX : ContentContainer.PositionY;
+ var checkChildTargetPosition = checkChildCurrentPosition + checkDisplacement;
+ var checkFinalTargetPosition = BoundScrollPosition(checkChildTargetPosition);
+ handled = !((int)checkFinalTargetPosition == 0 || -(int)checkFinalTargetPosition == (int)maxScrollDistance);
+ // If you propagate a gesture event, return;
+ if (!handled)
+ {
+ return handled;
+ }
+
+ //Interrupt touching when panning is started
+ this.InterceptTouchEvent += OnInterruptTouchingChildTouched;
OnScrollDragStarted();
}
else if (panGesture.State == Gesture.StateType.Continuing)
readyToNotice = true;
OnScrollAnimationStarted();
}
+ return handled;
}
internal void BaseRemove(View view)
float realDuration = progress * panAnimationDuration;
float realDistance = velocityOfLastPan * ((float)Math.Pow(decelerationRate, realDuration) - 1) / logValueOfDeceleration;
float result = Math.Min(realDistance / Math.Abs(panAnimationDelta), 1.0f);
+
+ // This is hot-fix for if the velocity has very small value, result is not updated even progress done.
+ if (progress > 0.99) result = 1.0f;
+
return result;
}
}
[EditorBrowsable(EditorBrowsableState.Never)]
protected virtual void Decelerating(float velocity, Animation animation)
{
+ if (animation == null) throw new ArgumentNullException(nameof(animation));
// Decelerating using deceleration equation ===========
//
// V : velocity (pixel per millisecond)
}
}
+ internal bool IsChildNearlyVisble(View child, float offset = 0)
+ {
+ if (ScreenPosition.X - offset < child.ScreenPosition.X + child.SizeWidth &&
+ ScreenPosition.X + SizeWidth + offset > child.ScreenPosition.X &&
+ ScreenPosition.Y - offset < child.ScreenPosition.Y + child.SizeHeight &&
+ ScreenPosition.Y + SizeHeight + offset > child.ScreenPosition.Y)
+ {
+ return true;
+ }
+ else
+ {
+ return false;
+ }
+ }
+
+ /// <inheritdoc/>
+ [EditorBrowsable(EditorBrowsableState.Never)]
+ public override View GetNextFocusableView(View currentFocusedView, View.FocusDirection direction, bool loopEnabled)
+ {
+ bool isHorizontal = (ScrollingDirection == Direction.Horizontal);
+ float targetPosition = -(ScrollingDirection == Direction.Horizontal ? ContentContainer.CurrentPosition.X : ContentContainer.CurrentPosition.Y);
+ float stepDistance = (stepScrollDistance != 0 ? stepScrollDistance : (isHorizontal ? Size.Width * 0.25f : Size.Height * 0.25f));
+
+ bool forward = ((isHorizontal && direction == View.FocusDirection.Right) ||
+ (!isHorizontal && direction == View.FocusDirection.Down) ||
+ (direction == View.FocusDirection.Clockwise));
+ bool backward = ((isHorizontal && direction == View.FocusDirection.Left) ||
+ (!isHorizontal && direction == View.FocusDirection.Up) ||
+ (direction == View.FocusDirection.CounterClockwise));
+
+ View nextFocusedView = FocusManager.Instance.GetNearestFocusableActor(this, currentFocusedView, direction);
+
+ // Move out focus from ScrollableBase.
+ // FIXME: Forward, Backward is unimplemented other components.
+ if (direction == View.FocusDirection.Forward ||
+ direction == View.FocusDirection.Backward ||
+ (nextFocusedView == null &&
+ ((forward && maxScrollDistance - targetPosition < 0.1f) ||
+ (backward && targetPosition < 0.1f))))
+ {
+ var next = FocusManager.Instance.GetNearestFocusableActor(this.Parent, this, direction);
+ Debug.WriteLineIf(focusDebugScrollableBase, $"Focus move [{direction}] out from ScrollableBase! Next focus target {next}:{next?.ID}");
+ return next;
+ }
+
+ if (focusDebugScrollableBase)
+ {
+ global::System.Text.StringBuilder debugMessage = new global::System.Text.StringBuilder("=========================================================\n");
+ debugMessage.Append($"GetNextFocusableView On: {this}:{this.ID}\n");
+ debugMessage.Append($"----------------Current: {currentFocusedView}:{currentFocusedView?.ID}\n");
+ debugMessage.Append($"-------------------Next: {nextFocusedView}:{nextFocusedView?.ID}\n");
+ debugMessage.Append($"--------------Direction: {direction}\n");
+ debugMessage.Append("=========================================================");
+ Debug.WriteLineIf(focusDebugScrollableBase, debugMessage);
+ }
+
+ if (nextFocusedView != null)
+ {
+ if (null != FindDescendantByID(nextFocusedView.ID))
+ {
+ if (IsChildNearlyVisble(nextFocusedView, stepDistance) == true)
+ {
+ ScrollToChild(nextFocusedView, true);
+ return nextFocusedView;
+ }
+ }
+ }
+
+ if (forward || backward)
+ {
+ // Fallback to current focus or scrollableBase till next focus visible in scrollable.
+ if (null != currentFocusedView && null != FindDescendantByID(currentFocusedView.ID))
+ {
+ nextFocusedView = currentFocusedView;
+ }
+ else
+ {
+ Debug.WriteLineIf(focusDebugScrollableBase, "current focus view is not decendant. return ScrollableBase!");
+ return this;
+ }
+
+ if (forward)
+ {
+ targetPosition += stepDistance;
+ targetPosition = targetPosition > maxScrollDistance ? maxScrollDistance : targetPosition;
+
+ }
+ else if (backward)
+ {
+ targetPosition -= stepDistance;
+ targetPosition = targetPosition < 0 ? 0 : targetPosition;
+ }
+
+ ScrollTo(targetPosition, true);
+
+ Debug.WriteLineIf(focusDebugScrollableBase, $"ScrollTo :({targetPosition})");
+ }
+
+ Debug.WriteLineIf(focusDebugScrollableBase, $"return end : {nextFocusedView}:{nextFocusedView?.ID}");
+ return nextFocusedView;
+ }
+
+ /// <inheritdoc/>
+ [EditorBrowsable(EditorBrowsableState.Never)]
+ protected override bool AccessibilityScrollToChild(View child)
+ {
+ if (child == null)
+ {
+ return false;
+ }
+
+ if (ScrollingDirection == Direction.Horizontal)
+ {
+ if (child.ScreenPosition.X + child.Size.Width <= this.ScreenPosition.X)
+ {
+ if (SnapToPage)
+ {
+ PageSnap(PageFlickThreshold + 1);
+ }
+ else
+ {
+ ScrollTo((float)(child.ScreenPosition.X - ContentContainer.ScreenPosition.X), false);
+ }
+ }
+ else if (child.ScreenPosition.X >= this.ScreenPosition.X + this.Size.Width)
+ {
+ if (SnapToPage)
+ {
+ PageSnap(-(PageFlickThreshold + 1));
+ }
+ else
+ {
+ ScrollTo((float)(child.ScreenPosition.X + child.Size.Width - ContentContainer.ScreenPosition.X - this.Size.Width), false);
+ }
+ }
+ }
+ else
+ {
+ if (child.ScreenPosition.Y + child.Size.Height <= this.ScreenPosition.Y)
+ {
+ if (SnapToPage)
+ {
+ PageSnap(PageFlickThreshold + 1);
+ }
+ else
+ {
+ ScrollTo((float)(child.ScreenPosition.Y - ContentContainer.ScreenPosition.Y), false);
+ }
+ }
+ else if (child.ScreenPosition.Y >= this.ScreenPosition.Y + this.Size.Height)
+ {
+ if (SnapToPage)
+ {
+ PageSnap(-(PageFlickThreshold + 1));
+ }
+ else
+ {
+ ScrollTo((float)(child.ScreenPosition.Y + child.Size.Height - ContentContainer.ScreenPosition.Y - this.Size.Height), false);
+ }
+ }
+ }
+
+ return true;
+ }
+
+ /// <inheritdoc/>
+ [EditorBrowsable(EditorBrowsableState.Never)]
+ public override bool OnWheel(Wheel wheel)
+ {
+ if (wheel == null)
+ {
+ return false;
+ }
+
+ float currentScrollPosition = -(ScrollingDirection == Direction.Horizontal ? ContentContainer.CurrentPosition.X : ContentContainer.CurrentPosition.Y);
+ ScrollTo(currentScrollPosition + (wheelScrollDistance * wheel.Z), false);
+
+ return true;
+ }
+
+ private bool OnWheelEvent(object o, WheelEventArgs e)
+ {
+ return OnWheel(e?.Wheel);
+ }
}
} // namespace
projects / platform / core / csapi / tizenfx.git / blobdiff