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Scrollbar.cs
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Scrollbar.cs
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/*
* Copyright(c) 2022 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
using System;
using System.ComponentModel;
using System.Diagnostics;
using Tizen.NUI.BaseComponents;
using Tizen.NUI.Binding;
namespace Tizen.NUI.Components
{
// Represents padding data : Start, End, Top, Bottom
using PaddingType = ValueTuple<ushort, ushort, ushort, ushort>;
/// <summary>
/// The Scrollbar is a component that contains track and thumb to indicate the current scrolled position of a scrollable object.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public class Scrollbar : ScrollbarBase
{
#region Fields
/// <summary>Bindable property of TrackThickness</summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public static readonly BindableProperty TrackThicknessProperty = BindableProperty.Create(nameof(TrackThickness), typeof(float), typeof(Scrollbar), default(float),
propertyChanged: (bindable, oldValue, newValue) => ((Scrollbar)bindable).UpdateTrackThickness((float?)newValue ?? 0),
defaultValueCreator: (bindable) => ((Scrollbar)bindable).trackThickness
);
/// <summary>Bindable property of ThumbThickness</summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public static readonly BindableProperty ThumbThicknessProperty = BindableProperty.Create(nameof(ThumbThickness), typeof(float), typeof(Scrollbar), default(float),
propertyChanged: (bindable, oldValue, newValue) => ((Scrollbar)bindable).UpdateThumbThickness((float?)newValue ?? 0),
defaultValueCreator: (bindable) => ((Scrollbar)bindable).thumbThickness
);
/// <summary>Bindable property of TrackColor</summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public static readonly BindableProperty TrackColorProperty = BindableProperty.Create(nameof(TrackColor), typeof(Color), typeof(Scrollbar), null,
propertyChanged: (bindable, oldValue, newValue) => ((Scrollbar)bindable).trackView.BackgroundColor = (Color)newValue,
defaultValueCreator: (bindable) => ((Scrollbar)bindable).trackView.BackgroundColor
);
/// <summary>Bindable property of ThumbColor</summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public static readonly BindableProperty ThumbColorProperty = BindableProperty.Create(nameof(ThumbColor), typeof(Color), typeof(Scrollbar), null,
propertyChanged: (bindable, oldValue, newValue) => ((Scrollbar)bindable).UpdateThumbColor((Color)newValue),
defaultValueCreator: (bindable) => ((Scrollbar)bindable).thumbColor
);
/// <summary>Bindable property of TrackPadding</summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public static readonly BindableProperty TrackPaddingProperty = BindableProperty.Create(nameof(TrackPadding), typeof(Extents), typeof(Scrollbar), null,
propertyChanged: (bindable, oldValue, newValue) => ((Scrollbar)bindable).UpdateTrackPadding((Extents)newValue),
defaultValueCreator: (bindable) => ((Scrollbar)bindable).trackPadding
);
/// <summary>Bindable property of ThumbVerticalImageUrl</summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public static readonly BindableProperty ThumbVerticalImageUrlProperty = BindableProperty.Create(nameof(ThumbVerticalImageUrl), typeof(string), typeof(Scrollbar), null,
propertyChanged: (bindable, oldValue, newValue) => ((Scrollbar)bindable).UpdateThumbImage((string)newValue, false),
defaultValueCreator: (bindable) => ((Scrollbar)bindable).thumbVerticalImageUrl
);
/// <summary>Bindable property of ThumbHorizontalImageUrl</summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public static readonly BindableProperty ThumbHorizontalImageUrlProperty = BindableProperty.Create(nameof(ThumbHorizontalImageUrl), typeof(string), typeof(Scrollbar), null,
propertyChanged: (bindable, oldValue, newValue) => ((Scrollbar)bindable).UpdateThumbImage((string)newValue, true),
defaultValueCreator: (bindable) => ((Scrollbar)bindable).thumbHorizontalImageUrl
);
private View trackView;
private ImageView thumbView;
private Animation thumbPositionAnimation;
private Animation thumbSizeAnimation;
private Animation opacityAnimation;
private Calculator calculator;
private Size containerSize = new Size(0, 0);
private float previousPosition;
private float trackThickness = 6.0f;
private float thumbThickness = 6.0f;
private string thumbVerticalImageUrl;
private string thumbHorizontalImageUrl;
private Color thumbColor;
private PaddingType trackPadding = new PaddingType(4, 4, 4, 4);
private bool isHorizontal;
private uint fadeOutThreshold = 500;
private int fadeDuration = 200;
private Timer fadeOutTimer;
#endregion Fields
#region Constructors
/// <summary>
/// Create an empty Scrollbar.
/// </summary>
public Scrollbar()
{
}
/// <summary>
/// Create a Scrollbar and initialize with properties.
/// </summary>
/// <param name="contentLength">The length of the scrollable content area.</param>
/// <param name="viewportLength">The length of the viewport representing the amount of visible content.</param>
/// <param name="currentPosition">The current position of the viewport in scrollable content area. This is the viewport's top position if the scroller is vertical, otherwise, left.</param>
/// <param name="isHorizontal">Whether the direction of scrolling is horizontal or not. It is vertical by default.</param>
[EditorBrowsable(EditorBrowsableState.Never)]
public Scrollbar(float contentLength, float viewportLength, float currentPosition, bool isHorizontal = false) : this()
{
Initialize(contentLength, viewportLength, currentPosition, isHorizontal);
}
/// <summary>
/// Create an empty Scrollbar with a ScrollbarStyle instance to set style properties.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public Scrollbar(ScrollbarStyle style) : base(style)
{
}
/// <summary>
/// Static constructor to initialize bindable properties when loading.
/// </summary>
static Scrollbar()
{
}
#endregion Constructors
#region Properties
/// <summary>
/// The thickness of the track.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public float TrackThickness
{
get => (float)GetValue(TrackThicknessProperty);
set => SetValue(TrackThicknessProperty, value);
}
/// <summary>
/// The thickness of the thumb.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public float ThumbThickness
{
get => (float)GetValue(ThumbThicknessProperty);
set => SetValue(ThumbThicknessProperty, value);
}
/// <summary>
/// The color of the track part.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public Color TrackColor
{
get => (Color)GetValue(TrackColorProperty);
set => SetValue(TrackColorProperty, value);
}
/// <summary>
/// The color of the thumb part.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public Color ThumbColor
{
get => (Color)GetValue(ThumbColorProperty);
set => SetValue(ThumbColorProperty, value);
}
/// <summary>
/// The padding value of the track.
/// Note that when the scrollbar is for vertical direction, Start value is ignored.
/// In case of horizontal direction, Top value is ignored.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public Extents TrackPadding
{
get => (Extents)GetValue(TrackPaddingProperty);
set => SetValue(TrackPaddingProperty, value);
}
/// <summary>
/// The image url of the vertical thumb.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public string ThumbVerticalImageUrl
{
get => (string)GetValue(ThumbVerticalImageUrlProperty);
set => SetValue(ThumbVerticalImageUrlProperty, value);
}
/// <summary>
/// The image url of the horizontal thumb.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public string ThumbHorizontalImageUrl
{
get => (string)GetValue(ThumbHorizontalImageUrlProperty);
set => SetValue(ThumbHorizontalImageUrlProperty, value);
}
/// <inheritdoc/>
[EditorBrowsable(EditorBrowsableState.Never)]
public override float ScrollPosition
{
get
{
if (calculator == null)
{
return 0.0f;
}
return Math.Min(Math.Max(calculator.currentPosition, 0.0f), calculator.contentLength - calculator.visibleLength);
}
}
/// <inheritdoc/>
[EditorBrowsable(EditorBrowsableState.Never)]
public override float ScrollCurrentPosition
{
get
{
if (calculator == null)
{
return 0.0f;
}
float length = Math.Min(Math.Max(calculator.currentPosition, 0.0f), calculator.contentLength - calculator.visibleLength);
if (thumbPositionAnimation != null)
{
float progress = thumbPositionAnimation.CurrentProgress;
float previousLength = Math.Min(Math.Max(previousPosition, 0.0f), calculator.contentLength - calculator.visibleLength);
length = ((1.0f - progress) * previousLength) + (progress * length);
}
return length;
}
}
/// <inheritdoc/>
[EditorBrowsable(EditorBrowsableState.Never)]
internal override uint FadeOutThreshold
{
get => fadeOutThreshold;
set => fadeOutThreshold = value;
}
/// <inheritdoc/>
[EditorBrowsable(EditorBrowsableState.Never)]
internal override int FadeDuration
{
get => fadeDuration;
set => fadeDuration = value;
}
#endregion Properties
#region Methods
/// <inheritdoc/>
[EditorBrowsable(EditorBrowsableState.Never)]
public override void OnInitialize()
{
base.OnInitialize();
trackView = new View()
{
PositionUsesPivotPoint = true,
AccessibilityHidden = true
};
Add(trackView);
var scrollbarStyle = ViewStyle as ScrollbarStyle;
thumbView = new ImageView(scrollbarStyle?.Thumb)
{
PositionUsesPivotPoint = true,
};
Add(thumbView);
WidthResizePolicy = ResizePolicyType.FillToParent;
HeightResizePolicy = ResizePolicyType.FillToParent;
EnableControlState = false;
}
/// <inheritdoc/>
[EditorBrowsable(EditorBrowsableState.Never)]
public override void Initialize(float contentLength, float viewportLength, float currentPosition, bool isHorizontal = false)
{
this.isHorizontal = isHorizontal;
if (isHorizontal)
{
if (thumbHorizontalImageUrl != null)
{
thumbView.ResourceUrl = thumbHorizontalImageUrl;
thumbView.Color = thumbColor;
thumbView.BackgroundColor = Color.Transparent;
}
calculator = new HorizontalCalculator(contentLength > 0.0f ? contentLength : 0.0f, viewportLength, currentPosition);
}
else
{
if (thumbVerticalImageUrl != null)
{
thumbView.ResourceUrl = thumbVerticalImageUrl;
thumbView.Color = thumbColor;
thumbView.BackgroundColor = Color.Transparent;
}
calculator = new VerticalCalculator(contentLength > 0.0f ? contentLength : 0.0f, viewportLength, currentPosition);
}
thumbPositionAnimation?.Clear();
thumbPositionAnimation = null;
thumbSizeAnimation?.Clear();
thumbSizeAnimation = null;
opacityAnimation?.Clear();
opacityAnimation = null;
var trackSize = calculator.CalculateTrackSize(TrackThickness, containerSize, trackPadding);
var trackPosition = calculator.CalculateTrackPosition(trackPadding);
var thumbSize = calculator.CalculateThumbSize(ThumbThickness, trackSize);
var thumbPosition = calculator.CalculateThumbPosition(trackSize, thumbSize, trackPadding);
Debug.Assert(trackView != null);
trackView.ParentOrigin = calculator.CalculatorTrackAlign();
trackView.PivotPoint = calculator.CalculatorTrackAlign();
trackView.Size = trackSize;
trackView.Position = trackPosition;
Debug.Assert(thumbView != null);
thumbView.ParentOrigin = calculator.CalculatorThumbAlign();
thumbView.PivotPoint = calculator.CalculatorThumbAlign();
thumbView.Size = thumbSize;
thumbView.Position = thumbPosition;;
Opacity = calculator.IsScrollable() ? 1.0f : 0.0f;
}
/// <inheritdoc/>
/// <exception cref="InvalidOperationException">Thrown when the scrollabr not yet initialized.</exception>
[EditorBrowsable(EditorBrowsableState.Never)]
public override void Update(float contentLength, float viewportLength, float position, uint durationMs = 0, AlphaFunction alphaFunction = null)
{
if (calculator == null)
{
throw new InvalidOperationException("Scrollbar is not initialized. Please call Initialize() first.");
}
calculator.visibleLength = viewportLength;
Update(contentLength, position, durationMs, alphaFunction);
}
/// <inheritdoc/>
/// <exception cref="InvalidOperationException">Thrown when the scrollabr not yet initialized.</exception>
[EditorBrowsable(EditorBrowsableState.Never)]
public override void Update(float contentLength, float position, uint durationMs = 0, AlphaFunction alphaFunction = null)
{
if (calculator == null)
{
throw new InvalidOperationException("Scrollbar is not initialized. Please call Initialize() first.");
}
calculator.contentLength = contentLength > 0.0f ? contentLength : 0.0f;
calculator.currentPosition = position;
float newOpacity = calculator.IsScrollable() ? 1.0f : 0.0f;
bool opacityChanged = (int)Opacity != (int)newOpacity;
var thumbSize = calculator.CalculateThumbSize(ThumbThickness, trackView.Size);
var thumbPosition = calculator.CalculateThumbScrollPosition(trackView.Size, thumbView.Position, trackPadding);
if (durationMs == 0)
{
thumbView.Position = thumbPosition;
thumbView.Size = thumbSize;
if (opacityChanged)
{
Opacity = newOpacity;
}
return;
}
EnsureThumbPositionAnimation().AnimateTo(thumbView, "Position", thumbPosition, 0, (int)durationMs, alphaFunction);
thumbPositionAnimation.Play();
EnsureThumbSizeAnimation().AnimateTo(thumbView, "Size", thumbSize, 0, (int)durationMs, alphaFunction);
thumbSizeAnimation.Play();
if (opacityChanged)
{
EnsureOpacityAnimation().AnimateTo(this, "Opacity", newOpacity, 0, (int)durationMs, alphaFunction);
opacityAnimation.Play();
}
}
/// <inheritdoc/>
/// <remarks>Please note that, for now, only alpha functions created with BuiltinFunctions are valid when animating. Otherwise, it will be treated as a linear alpha function. </remarks>
[EditorBrowsable(EditorBrowsableState.Never)]
public override void ScrollTo(float position, uint durationMs = 0, AlphaFunction alphaFunction = null)
{
if (ControlState == ControlState.Disabled)
{
return;
}
if (calculator == null)
{
return;
}
previousPosition = calculator.currentPosition;
calculator.currentPosition = position;
var thumbPosition = calculator.CalculateThumbScrollPosition(trackView.Size, thumbView.Position, trackPadding);
if (durationMs == 0)
{
thumbView.Position = thumbPosition;
return;
}
EnsureThumbPositionAnimation().AnimateTo(thumbView, "position", thumbPosition, 0, (int)durationMs, alphaFunction);
thumbPositionAnimation.Play();
}
/// <inheritdoc/>
[EditorBrowsable(EditorBrowsableState.Never)]
public override void OnRelayout(Vector2 size, RelayoutContainer container)
{
base.OnRelayout(size, container);
if (size == null || size.Width == containerSize.Width && size.Height == containerSize.Height)
{
return;
}
containerSize = new Size(size.Width, size.Height);
if (calculator == null)
{
return;
}
trackView.Size = calculator.CalculateTrackSize(TrackThickness, containerSize, trackPadding);
trackView.Position = calculator.CalculateTrackPosition(trackPadding);
thumbView.Size = calculator.CalculateThumbSize(ThumbThickness, trackView.Size);
thumbView.Position = calculator.CalculateThumbPosition(trackView.Size, thumbView.Size, trackPadding);
}
/// <inheritdoc/>
[EditorBrowsable(EditorBrowsableState.Never)]
internal override void FadeOut()
{
if (fadeOutTimer == null)
{
fadeOutTimer = new Timer(fadeOutThreshold);
fadeOutTimer.Tick += ((object target, Timer.TickEventArgs args) =>
{
var anim = EnsureOpacityAnimation();
if (Opacity != 0.0f)
{
anim.AnimateTo(this, "Opacity", 0.0f, 0, fadeDuration);
anim.Play();
}
fadeOutTimer = null;
return false;
});
fadeOutTimer.Start();
}
}
/// <inheritdoc/>
[EditorBrowsable(EditorBrowsableState.Never)]
internal override void FadeIn()
{
if (fadeOutTimer != null)
{
fadeOutTimer.Stop();
fadeOutTimer.Dispose();
fadeOutTimer = null;
}
var anim = EnsureOpacityAnimation();
if (Opacity != 1.0)
{
anim.AnimateTo(this, "Opacity", 1.0f, 0, fadeDuration);
anim.Play();
}
}
/// <inheritdoc/>
[EditorBrowsable(EditorBrowsableState.Never)]
public override void ApplyStyle(ViewStyle viewStyle)
{
base.ApplyStyle(viewStyle);
if (viewStyle is ScrollbarStyle scrollbarStyle)
{
thumbView?.ApplyStyle(scrollbarStyle.Thumb);
}
}
/// <inheritdoc/>
[EditorBrowsable(EditorBrowsableState.Never)]
protected override ViewStyle CreateViewStyle()
{
return new ScrollbarStyle();
}
/// <summary>
/// Update TrackThickness property of the scrollbar.
/// </summary>
/// <param name="thickness">The width of the track.</param>
private void UpdateTrackThickness(float thickness)
{
trackThickness = thickness;
if (calculator == null)
{
return;
}
trackView.Size = calculator.CalculateTrackSize(thickness, containerSize, trackPadding);
}
/// <summary>
/// Update ThumbThickness property of the scrollbar.
/// </summary>
/// <param name="thickness">The width of the track.</param>
private void UpdateThumbThickness(float thickness)
{
thumbThickness = thickness;
if (calculator == null)
{
return;
}
thumbView.Size = calculator.CalculateThumbSize(thickness, trackView.Size);
}
/// <summary>
/// Update TrackPadding property of the scrollbar.
/// </summary>
/// <param name="padding">The padding of the track.</param>
private void UpdateTrackPadding(Extents padding)
{
trackPadding = padding == null ? new PaddingType(0, 0, 0, 0) : new PaddingType(padding.Start, padding.End, padding.Top, padding.Bottom);
if (calculator == null)
{
return;
}
trackView.Size = calculator.CalculateTrackSize(TrackThickness, containerSize, trackPadding);
trackView.Position = calculator.CalculateTrackPosition(trackPadding);
thumbView.Size = calculator.CalculateThumbSize(ThumbThickness, trackView.Size);
thumbView.Position = calculator.CalculateThumbPaddingPosition(trackView.Size, thumbView.Size, thumbView.Position, trackPadding);
}
private void UpdateThumbColor(Color color)
{
thumbColor = color;
if (!String.IsNullOrEmpty(thumbView.ResourceUrl))
{
thumbView.Color = color;
thumbView.BackgroundColor = Color.Transparent;
}
else
{
thumbView.BackgroundColor = color;
}
}
private void UpdateThumbImage(string url, bool isHorizontal)
{
if (isHorizontal)
{
thumbHorizontalImageUrl = url;
if (this.isHorizontal)
{
thumbView.ResourceUrl = url;
thumbView.Color = thumbColor;
thumbView.BackgroundColor = Color.Transparent;
}
}
else
{
thumbVerticalImageUrl = url;
if (!this.isHorizontal)
{
thumbView.ResourceUrl = url;
thumbView.Color = thumbColor;
thumbView.BackgroundColor = Color.Transparent;
}
}
}
private Animation EnsureThumbPositionAnimation()
{
if (thumbPositionAnimation == null)
{
thumbPositionAnimation = new Animation();
}
else
{
thumbPositionAnimation.Stop();
thumbPositionAnimation.Clear();
}
return thumbPositionAnimation;
}
private Animation EnsureThumbSizeAnimation()
{
if (thumbSizeAnimation == null)
{
thumbSizeAnimation = new Animation();
}
else
{
thumbSizeAnimation.Stop();
thumbSizeAnimation.Clear();
}
return thumbSizeAnimation;
}
private Animation EnsureOpacityAnimation()
{
if (opacityAnimation == null)
{
opacityAnimation = new Animation();
}
else
{
opacityAnimation.Stop();
opacityAnimation.Clear();
}
return opacityAnimation;
}
#endregion Methods
#region Classes
private abstract class Calculator
{
public float contentLength;
public float visibleLength;
public float currentPosition;
public Calculator(float contentLength, float visibleLength, float currentPosition)
{
this.contentLength = contentLength;
this.visibleLength = visibleLength;
this.currentPosition = currentPosition;
}
public bool IsScrollable()
{
return contentLength > visibleLength;
}
public abstract Position CalculatorTrackAlign();
public abstract Position CalculatorThumbAlign();
public abstract Size CalculateTrackSize(float thickness, Size containerSize, PaddingType trackPadding);
public abstract Position CalculateTrackPosition(PaddingType trackPadding);
public abstract Size CalculateThumbSize(float thickness, Size trackSize);
public abstract Position CalculateThumbPosition(Size trackSize, Size thumbSize, PaddingType trackPadding);
public abstract Position CalculateThumbPaddingPosition(Size trackSize, Size thumbSize, Position thumbCurrentPosition, PaddingType trackPadding);
public abstract Position CalculateThumbScrollPosition(Size trackSize, Position thumbCurrentPosition, PaddingType trackPadding);
}
private class HorizontalCalculator : Calculator
{
public HorizontalCalculator(float contentLength, float visibleLength, float currentPosition) : base(contentLength, visibleLength, currentPosition)
{
}
public override Position CalculatorTrackAlign()
{
return Tizen.NUI.ParentOrigin.BottomLeft;
}
public override Position CalculatorThumbAlign()
{
return Tizen.NUI.ParentOrigin.BottomLeft;
}
public override Size CalculateTrackSize(float thickness, Size containerSize, PaddingType trackPadding)
{
return new Size(containerSize.Width - trackPadding.Item1 - trackPadding.Item2, thickness);
}
public override Position CalculateTrackPosition(PaddingType trackPadding)
{
return new Position(trackPadding.Item1, -trackPadding.Item4);
}
public override Size CalculateThumbSize(float thickness, Size trackSize)
{
return new Size(trackSize.Width * (IsScrollable() ? (visibleLength / contentLength) : 0.0f), thickness);
}
public override Position CalculateThumbPosition(Size trackSize, Size thumbSize, PaddingType trackPadding)
{
float padding = ((trackSize.Height - thumbSize.Height) / 2.0f) + trackPadding.Item4;
return new Position(trackPadding.Item1 + (IsScrollable() ? (trackSize.Width * (Math.Min(Math.Max(currentPosition, 0.0f), contentLength - visibleLength)) / contentLength) : 0.0f), -padding);
}
public override Position CalculateThumbPaddingPosition(Size trackSize, Size thumbSize, Position thumbCurrentPosition, PaddingType trackPadding)
{
float padding = ((trackSize.Height - thumbSize.Height) / 2.0f) + trackPadding.Item4;
return new Position(thumbCurrentPosition.X, -padding);
}
public override Position CalculateThumbScrollPosition(Size trackSize, Position thumbCurrentPosition, PaddingType trackPadding)
{
return new Position(trackPadding.Item1 + (IsScrollable() ? (trackSize.Width * (Math.Min(Math.Max(currentPosition, 0.0f), contentLength - visibleLength)) / contentLength) : 0.0f), thumbCurrentPosition.Y);
}
}
private class VerticalCalculator : Calculator
{
public VerticalCalculator(float contentLength, float visibleLength, float currentPosition) : base(contentLength, visibleLength, currentPosition)
{
}
public override Position CalculatorTrackAlign()
{
return Tizen.NUI.ParentOrigin.TopRight;
}
public override Position CalculatorThumbAlign()
{
return Tizen.NUI.ParentOrigin.TopRight;
}
public override Size CalculateTrackSize(float thickness, Size containerSize, PaddingType trackPadding)
{
return new Size(thickness, containerSize.Height - trackPadding.Item3 - trackPadding.Item4);
}
public override Position CalculateTrackPosition(PaddingType trackPadding)
{
return new Position(-trackPadding.Item2, trackPadding.Item3);
}
public override Size CalculateThumbSize(float thickness, Size trackSize)
{
return new Size(thickness, trackSize.Height * (IsScrollable() ? (visibleLength / contentLength) : 0.0f));
}
public override Position CalculateThumbPosition(Size trackSize, Size thumbSize, PaddingType trackPadding)
{
float padding = ((trackSize.Width - thumbSize.Width) / 2.0f) + trackPadding.Item2;
return new Position(-padding, trackPadding.Item3 + (IsScrollable() ? (trackSize.Height * Math.Min(Math.Max(currentPosition, 0.0f), contentLength - visibleLength) / contentLength) : 0.0f));
}
public override Position CalculateThumbPaddingPosition(Size trackSize, Size thumbSize, Position thumbCurrentPosition, PaddingType trackPadding)
{
float padding = ((trackSize.Width - thumbSize.Width) / 2.0f) + trackPadding.Item2;
return new Position(-padding, thumbCurrentPosition.Y);
}
public override Position CalculateThumbScrollPosition(Size trackSize, Position thumbPosition, PaddingType trackPadding)
{
return new Position(thumbPosition.X, trackPadding.Item3 + (IsScrollable() ? (trackSize.Height * Math.Min(Math.Max(currentPosition, 0.0f), contentLength - visibleLength) / contentLength) : 0.0f));
}
}
#endregion Classes
}
}