/// <summary>
/// This method is called many times per second, called by the DocumentWorkspace.
/// </summary>
protected virtual void OnPulse()
{
if (this.panTracking && this.lastButton == MouseButtons.Right)
{
Point position = this.lastMouseXY;
RectangleF visibleRect = DocumentWorkspace.VisibleDocumentRectangleF;
PointF visibleCenterPt = Utility.GetRectangleCenter(visibleRect);
PointF delta = new PointF(position.X - visibleCenterPt.X, position.Y - visibleCenterPt.Y);
PointF newScroll = DocumentWorkspace.DocumentScrollPositionF;
this.trackingNub.Visible = true;
if (delta.X != 0 || delta.Y != 0)
{
newScroll.X += delta.X;
newScroll.Y += delta.Y;
++this.ignoreMouseMove; // setting DocumentScrollPosition incurs a MouseMove event. ignore it prevents 'jittering' at non-integral zoom levels (like, say, 743%)
UI.SuspendControlPainting(DocumentWorkspace);
DocumentWorkspace.DocumentScrollPositionF = newScroll;
this.trackingNub.Visible = true;
this.trackingNub.Location = Utility.GetRectangleCenter(DocumentWorkspace.VisibleDocumentRectangleF);
UI.ResumeControlPainting(DocumentWorkspace);
DocumentWorkspace.Invalidate(true);
Update();
}
}
}
