private FrameworkElement GetTimeFrameElement(ITimeRange timeFrame)
{
if (timeFrame == null)
{
throw new Exception("TimeFrame不能为null");
}
if (TimeFrameTemplate == null)
{
throw new Exception("TimeFrameTemplate不能为null");
}
double timeScaleUnitTicks = TimelineHelper.GetScaleUnitTicks(TimeScaleUnit);
FrameworkElement timeFrameElement = TimeFrameTemplate.LoadContent() as FrameworkElement;
timeFrameElement.DataContext = timeFrame;
timeFrameElement.Width = (timeFrame.EndTime - timeFrame.BeginTime).Ticks / timeScaleUnitTicks * TimeScaleUnitWidth;
timeFrameElement.Height = 20;
double offset = (timeFrame.BeginTime - CurrentDateTime).Ticks / timeScaleUnitTicks * TimeScaleUnitWidth + _canvas.ActualWidth / 2;
Canvas.SetLeft(timeFrameElement, offset);
return(timeFrameElement);
}
private void InitTimeScales()
{
foreach (FrameworkElement oldTimeScale in _timeScalesList)
{
_canvas.Children.Remove(oldTimeScale);
}
//获取需要绘制的时间刻度的数量
int scaleUnitCount = (int)Math.Ceiling(_canvas.ActualWidth / TimeScaleUnitWidth) + 4;
//获取单位时间刻度时长
long scaleUnitTick = TimelineHelper.GetScaleUnitTicks(TimeScaleUnit);
long startScaleUnitTicks = CurrentDateTime.Ticks - CurrentDateTime.Ticks % scaleUnitTick - scaleUnitCount / 2 * scaleUnitTick;
for (int i = 0; i < scaleUnitCount; i++)
{
FrameworkElement timeScaleUnit = GetTimeScaleUnit();
//时间刻度开始点所代表的时间刻度
DateTime scaleDateTime = new DateTime(startScaleUnitTicks + i * scaleUnitTick);
double offsetValue = (double)(scaleDateTime - CurrentDateTime).Ticks / scaleUnitTick;
timeScaleUnit.DataContext = scaleDateTime;
timeScaleUnit.SetValue(Canvas.LeftProperty, _canvas.ActualWidth / 2 + offsetValue * TimeScaleUnitWidth);
_canvas.Children.Add(timeScaleUnit);
_timeScalesList.Add(timeScaleUnit);
}
}
private void TimelineBand_MouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed)
{
//鼠标水平移动距离
double moveX = e.GetPosition(null).X - _dragPoint.X;
long timeScaleUnitTicks = TimelineHelper.GetScaleUnitTicks(TimeScaleUnit);
long moveTicks = -(long)(moveX / TimeScaleUnitWidth * timeScaleUnitTicks);
DateTime moveTempDateTime = CurrentDateTime.AddTicks(moveTicks);
DateTime moveTargetDateTime = moveTempDateTime;
if (moveTempDateTime < MinDateTime)
{
moveTargetDateTime = MinDateTime;
}
else if (moveTempDateTime > MaxDateTime)
{
moveTargetDateTime = MaxDateTime;
}
//设置当前时间点
CurrentDateTime = moveTargetDateTime;
if (IsMainBand && _hostTimeline != null)
{
_hostTimeline.CurrentDateTime = CurrentDateTime;
}
_dragPoint = e.GetPosition(null);
}
}
/// <summary>
/// 移动时间刻度
/// </summary>
/// <param name="frameworkElementMoveX"></param>
private void MoveTimeScaleUnits(double frameworkElementMoveX)
{
if (_timeScalesList.Count == 0)
{
return;
}
long timeScaleUnitTicks = TimelineHelper.GetScaleUnitTicks(TimeScaleUnit);
for (int i = _timeScalesList.Count - 1; i >= 0; i--)
{
double scaleUnitLeft = frameworkElementMoveX + Canvas.GetLeft(_timeScalesList[i]);
Canvas.SetLeft(_timeScalesList[i], scaleUnitLeft);
//移出超过范围的TimeScaleUnit
if (scaleUnitLeft < -TimeScaleUnitWidth * 3 || scaleUnitLeft > _canvas.ActualWidth + TimeScaleUnitWidth * 2)
{
_canvas.Children.Remove(_timeScalesList[i]);
_timeScalesList.RemoveAt(i);
continue;
}
}
FrameworkElement firstScaleElement = _timeScalesList.First();
int frontAddScaleUnitCount = (int)(Canvas.GetLeft(firstScaleElement) / TimeScaleUnitWidth) + 2;
for (int i = 0; i < frontAddScaleUnitCount; i++)
{
DateTime scaleDateTime = ((DateTime)firstScaleElement.DataContext).AddTicks(-timeScaleUnitTicks);
FrameworkElement timeScaleUnit = GetTimeScaleUnit();
timeScaleUnit.DataContext = scaleDateTime;
timeScaleUnit.SetValue(Canvas.LeftProperty, Canvas.GetLeft(firstScaleElement) - TimeScaleUnitWidth);
_canvas.Children.Add(timeScaleUnit);
_timeScalesList.Insert(0, timeScaleUnit);
}
int backAddScaleUnitCount = (int)Math.Ceiling((_canvas.ActualWidth - Canvas.GetLeft(_timeScalesList.Last())) / TimeScaleUnitWidth);
for (int i = 0; i < backAddScaleUnitCount; i++)
{
DateTime scaleDateTime = ((DateTime)_timeScalesList.Last().DataContext).AddTicks(timeScaleUnitTicks);
FrameworkElement timeScaleUnit = GetTimeScaleUnit();
timeScaleUnit.DataContext = scaleDateTime;
timeScaleUnit.SetValue(Canvas.LeftProperty, Canvas.GetLeft(_timeScalesList.Last()) + TimeScaleUnitWidth);
_canvas.Children.Add(timeScaleUnit);
_timeScalesList.Add(timeScaleUnit);
}
}
private void UpdateTimelineBandElementsPositionByDateTime(DateTime oldDateTime, DateTime newDateTime)
{
long timeScaleUnitTicks = TimelineHelper.GetScaleUnitTicks(TimeScaleUnit);
//TimelineBand元素水平移动距离
double frameworkElementMoveX = (oldDateTime - newDateTime).Ticks / (double)timeScaleUnitTicks * TimeScaleUnitWidth;
//移动时间刻度
MoveTimeScaleUnits(frameworkElementMoveX);
//移动时间片段
MoveTimeFrameElements(frameworkElementMoveX);
}
private void TimelineBand_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
_isDragging = true;
_dragPoint = e.GetPosition(null);
RoutedEventArgs timelineBandStartDragEventArgs = new RoutedEventArgs(TimelineBandStartDragEvent, this);
RaiseEvent(timelineBandStartDragEventArgs);
if (e.ClickCount >= 2)
{
Point clickPoint = e.GetPosition(_canvas);
DateTime clickDateTime = CurrentDateTime.AddTicks((long)((clickPoint.X - _canvas.ActualWidth / 2) / TimeScaleUnitWidth * TimelineHelper.GetScaleUnitTicks(TimeScaleUnit)));
TimelineBandDoubleClickEventArgs args = new TimelineBandDoubleClickEventArgs(TimelineBandDoubleClickEvent, this, clickDateTime);
RaiseEvent(args);
}
CaptureMouse();
}
