void UpdateContentZoomer()
{
if (m_MinScale != m_MaxScale)
{
if (m_Zoomer == null)
{
m_Zoomer = new ContentZoomer();
this.AddManipulator(m_Zoomer);
}
m_Zoomer.minScale = m_MinScale;
m_Zoomer.maxScale = m_MaxScale;
m_Zoomer.scaleStep = m_ScaleStep;
m_Zoomer.referenceScale = m_ReferenceScale;
}
else
{
if (m_Zoomer != null)
{
this.RemoveManipulator(m_Zoomer);
}
}
ValidateTransform();
}
private void OnWheel(WheelEvent evt)
{
GraphView graphView = base.target as GraphView;
if (graphView != null)
{
if (!MouseCaptureController.IsMouseCaptureTaken())
{
Vector3 vector = graphView.viewTransform.position;
Vector3 scale = graphView.viewTransform.scale;
Vector2 vector2 = base.target.ChangeCoordinatesTo(graphView.contentViewContainer, evt.localMousePosition);
float x = vector2.x + graphView.contentViewContainer.layout.x;
float y = vector2.y + graphView.contentViewContainer.layout.y;
vector += Vector3.Scale(new Vector3(x, y, 0f), scale);
float num = ContentZoomer.CalculateNewZoom(scale.y, -evt.delta.y, this.scaleStep, this.referenceScale, this.minScale, this.maxScale);
scale.x = num;
scale.y = num;
scale.z = 1f;
vector -= Vector3.Scale(new Vector3(x, y, 0f), scale);
if (graphView.elementPanel != null && this.keepPixelCacheOnZoom)
{
graphView.elementPanel.keepPixelCacheOnWorldBoundChange = true;
if (this.m_OnTimerTicker == null)
{
this.m_OnTimerTicker = graphView.schedule.Execute(new Action <TimerState>(this.OnTimer));
}
this.m_OnTimerTicker.ExecuteLater(500L);
this.delayRepaintScheduled = true;
}
graphView.UpdateViewTransform(vector, scale);
evt.StopPropagation();
}
}
}