private void DragEventHandler(object sender, DragEventArgs e)
{
base.ResetState(false);
if (this.animation)
{
this.flickDistance = Vector2.Zero;
this.animation = false;
}
this.animationState = ScrollPanel.AnimationState.Drag;
if (this.ScrollBarVisibility == ScrollBarVisibility.ScrollingVisible)
{
this.scrollBarH.Visible = this.isHorizontalScrollable();
this.scrollBarV.Visible = this.isVerticalScrollable();
}
if (this.isHorizontalScrollable())
{
this.panel.X += e.Distance.X;
this.panel.X = MathUtility.Clamp <float>(this.panel.X, this.Width - this.panel.Width, 0f);
}
if (this.isVerticalScrollable())
{
this.panel.Y += e.Distance.Y;
this.panel.Y = MathUtility.Clamp <float>(this.panel.Y, this.Height - this.panel.Height, 0f);
}
this.UpdateScrollBarPos();
}
protected override void OnUpdate(float elapsedTime)
{
base.OnUpdate(elapsedTime);
if (!this.animation)
{
return;
}
if (Math.Abs(this.flickDistance.X) < 0.5f && Math.Abs(this.flickDistance.Y) < 0.5f)
{
this.flickDistance = Vector2.Zero;
this.animationState = ScrollPanel.AnimationState.None;
this.animation = false;
this.UpdateView();
return;
}
this.animationElapsedTime += elapsedTime;
float num = (float)Math.Exp((double)(-(double)this.animationElapsedTime * 0.00539892027f));
this.flickDistance = this.startFlickDistance * num;
if (Math.Abs(this.flickDistance.X) > 0.5f)
{
this.panel.X = this.startPanelPos.X + (this.startFlickDistance.X - this.flickDistance.X) / 0.09f;
this.panel.X = FMath.Clamp(this.panel.X, this.Width - this.panel.Width, 0f);
}
if (Math.Abs(this.flickDistance.Y) > 0.5f)
{
this.panel.Y = this.startPanelPos.Y + (this.startFlickDistance.Y - this.flickDistance.Y) / 0.09f;
this.panel.Y = FMath.Clamp(this.panel.Y, this.Height - this.panel.Height, 0f);
}
this.UpdateScrollBarPos();
}
protected internal override void OnTouchEvent(TouchEventCollection touchEvents)
{
base.OnTouchEvent(touchEvents);
if (touchEvents.PrimaryTouchEvent.Type == TouchEventType.Up && !this.animation)
{
if (this.ScrollBarVisibility == ScrollBarVisibility.ScrollingVisible)
{
this.scrollBarH.Visible = false;
this.scrollBarV.Visible = false;
}
this.animationState = ScrollPanel.AnimationState.None;
}
if (this.animationState != ScrollPanel.AnimationState.Drag && this.animationState != ScrollPanel.AnimationState.Flick)
{
touchEvents.Forward = true;
}
}
public ScrollPanel()
{
this.panel = new Panel();
this.panel.Clip = true;
base.AddChildLast(this.panel);
this.scrollBarH = new ScrollBar(ScrollBarOrientation.Horizontal);
this.scrollBarV = new ScrollBar(ScrollBarOrientation.Vertical);
base.AddChildLast(this.scrollBarH);
base.AddChildLast(this.scrollBarV);
this.animationState = ScrollPanel.AnimationState.None;
base.Clip = true;
base.HookChildTouchEvent = true;
DragGestureDetector dragGestureDetector = new DragGestureDetector();
dragGestureDetector.DragDetected += new EventHandler <DragEventArgs>(this.DragEventHandler);
base.AddGestureDetector(dragGestureDetector);
FlickGestureDetector flickGestureDetector = new FlickGestureDetector();
flickGestureDetector.FlickDetected += new EventHandler <FlickEventArgs>(this.FlickEventHandler);
base.AddGestureDetector(flickGestureDetector);
this.UpdateView();
}
private void FlickEventHandler(object sender, FlickEventArgs e)
{
base.ResetState(false);
this.animationState = ScrollPanel.AnimationState.Flick;
if (this.ScrollBarVisibility == ScrollBarVisibility.ScrollingVisible)
{
this.scrollBarH.Visible = this.isHorizontalScrollable();
this.scrollBarV.Visible = this.isVerticalScrollable();
}
if (this.isHorizontalScrollable())
{
this.flickDistance.X = e.Speed.X * 0.03f;
}
if (this.isVerticalScrollable())
{
this.flickDistance.Y = e.Speed.Y * 0.03f;
}
this.startFlickDistance = this.flickDistance;
this.startPanelPos.X = this.panel.X;
this.startPanelPos.Y = this.panel.Y;
this.animationElapsedTime = 0f;
this.animation = true;
}
