public Chart()
{
DefaultStyleKey = typeof(Chart);
storyboard = new Storyboard();
scrollStoryboard = new Storyboard();
scrollStoryboard.Completed += (e, c) =>
{
//容器滚动动画结束
//发送通知
OnAnimationLockEvent?.Invoke(this, false, 0);
isScrollAnimationActive = false;
};
sineEase = new SineEase()
{
EasingMode = EasingMode.EaseInOut
};
scrollAnimation = new DoubleAnimation();
}
/// <summary>
/// 容器滚动
/// </summary>
/// <param name="d">0左，1右</param>
private void Scroll(int d)
{
if (ItemsScrollViewer != null &&
ItemsScrollViewer.ComputedHorizontalScrollBarVisibility == Visibility.Visible &&
!isScrollAnimationActive
)
{
isScrollAnimationActive = IsAnimation;
//取一个数据控件
double LostWidth = 0;
if (ItemContainer.Children.Count > 1)
{
//取第二个，才有margin属性
ChartItem chartItem = ItemContainer.Children[1] as ChartItem;
double oneItemWidth = chartItem.ActualWidth + chartItem.Margin.Left;
//每屏最多多少个项目
double onePageMaxItemNum = ItemsScrollViewer.ActualWidth / oneItemWidth;
if ((int)onePageMaxItemNum != onePageMaxItemNum)
{
//带小数点，需要计算
LostWidth = oneItemWidth - double.Parse(("0." + onePageMaxItemNum.ToString().Split('.')[1])) * oneItemWidth - chartItem.Margin.Left;
}
}
//计算一屏滚动值
double onePageScrollValue = ItemsScrollViewer.ActualWidth - LostWidth - 2;
//滚动值
double to;
if (d == 0)
{
//左滚
double leftScrollValue = ItemsScrollViewer.HorizontalOffset - onePageScrollValue;
to = leftScrollValue > 0 ? leftScrollValue : 0;
}
else
{
//右滚
double rightScrollValue = ItemsScrollViewer.HorizontalOffset + onePageScrollValue;
to = rightScrollValue < ItemsScrollViewer.ScrollableWidth ? rightScrollValue : ItemsScrollViewer.ScrollableWidth;
}
if (ItemsScrollViewer.HorizontalOffset == to)
{
//不执行无变化的动画
isScrollAnimationActive = false;
return;
}
if (IsAnimation)
{
OnAnimationLockEvent?.Invoke(this, true, 0);
scrollAnimation.From = ItemsScrollViewer.HorizontalOffset;
scrollAnimation.To = to;
scrollStoryboard.Begin();
}
else
{
ItemsScrollViewer.ScrollToHorizontalOffset(to);
HandleScrollViewerState();
}
}
}
