public void DisplayCurrentImageInScrollView()
{
foreach (UIView _subView in svImagePager.Subviews)
{
//Clear all previous subviews
_subView.RemoveFromSuperview();
}
//Load the current Image
//-------------------------
BusinessModel.Image _currentImageRecord = m_questionImagesList [m_currentImageDisplayIndex];
UIImage _currentImageDataToDisplay = UIImage.FromFile(_currentImageRecord.FilePath);
UIImageView _currentImageViewToDisplay = new UIImageView(_currentImageDataToDisplay);
_currentImageViewToDisplay.Frame = new RectangleF(0, 0, _currentImageDataToDisplay.Size.Width, _currentImageDataToDisplay.Size.Height);
_currentImageViewToDisplay.UserInteractionEnabled = true;
AttachImageViewTapGestureRecognizer(_currentImageViewToDisplay);
RectangleF _currentImageScrollViewFrame = svImagePager.Frame;
_currentImageScrollViewFrame.X = _currentImageScrollViewFrame.Width * m_currentImageDisplayIndex;
_currentImageScrollViewFrame.Y = 0;
svCurrentImageZoomView = new UIScrollView(_currentImageScrollViewFrame);
svCurrentImageZoomView.AutoresizingMask = UIViewAutoresizing.All;
svCurrentImageZoomView.BackgroundColor = m_imageBackgroundColor;
svCurrentImageZoomView.ContentSize = _currentImageDataToDisplay.Size;
svCurrentImageZoomView.AddSubview(_currentImageViewToDisplay);
svCurrentImageZoomView.ViewForZoomingInScrollView = GetZoomedView;
svCurrentImageZoomView.DidZoom += ZoomView_DidZoom;
svImagePager.AddSubview(svCurrentImageZoomView);
if (m_currentImageDisplayIndex > 0)
{
//Load previous image
BusinessModel.Image _previousImageRecord = m_questionImagesList [m_currentImageDisplayIndex - 1];
UIImage _previousImageDataToDisplay = UIImage.FromFile(_previousImageRecord.FilePath);
UIImageView _previousImageViewToDisplay = new UIImageView(_previousImageDataToDisplay);
_previousImageViewToDisplay.Frame = new RectangleF(0, 0, _previousImageDataToDisplay.Size.Width, _previousImageDataToDisplay.Size.Height);
_previousImageViewToDisplay.UserInteractionEnabled = true;
AttachImageViewTapGestureRecognizer(_previousImageViewToDisplay);
RectangleF _previousImageScrollViewFrame = svImagePager.Frame;
_previousImageScrollViewFrame.X = _previousImageScrollViewFrame.Width * (m_currentImageDisplayIndex - 1);
_previousImageScrollViewFrame.Y = 0;
svPreviousImageZoomView = new UIScrollView(_previousImageScrollViewFrame);
svPreviousImageZoomView.AutoresizingMask = UIViewAutoresizing.All;
svPreviousImageZoomView.BackgroundColor = m_imageBackgroundColor;
svPreviousImageZoomView.ContentSize = _previousImageDataToDisplay.Size;
svPreviousImageZoomView.AddSubview(_previousImageViewToDisplay);
svPreviousImageZoomView.ViewForZoomingInScrollView = GetZoomedView;
svPreviousImageZoomView.DidZoom += ZoomView_DidZoom;
svImagePager.AddSubview(svPreviousImageZoomView);
}
else
{
svPreviousImageZoomView = null;
}
if (m_currentImageDisplayIndex < m_questionImagesList.Count - 1)
{
//Load next image
BusinessModel.Image _nextImageRecord = m_questionImagesList [m_currentImageDisplayIndex + 1];
UIImage _nextImageDataToDisplay = UIImage.FromFile(_nextImageRecord.FilePath);
UIImageView _nextImageViewToDisplay = new UIImageView(_nextImageDataToDisplay);
_nextImageViewToDisplay.Frame = new RectangleF(0, 0, _nextImageDataToDisplay.Size.Width, _nextImageDataToDisplay.Size.Height);
_nextImageViewToDisplay.UserInteractionEnabled = true;
AttachImageViewTapGestureRecognizer(_nextImageViewToDisplay);
RectangleF _nextImageScrollViewFrame = svImagePager.Frame;
_nextImageScrollViewFrame.X = _nextImageScrollViewFrame.Width * (m_currentImageDisplayIndex + 1);
_nextImageScrollViewFrame.Y = 0;
svNextImageZoomView = new UIScrollView(_nextImageScrollViewFrame);
svNextImageZoomView.AutoresizingMask = UIViewAutoresizing.All;
svNextImageZoomView.BackgroundColor = m_imageBackgroundColor;
svNextImageZoomView.ContentSize = _nextImageDataToDisplay.Size;
svNextImageZoomView.AddSubview(_nextImageViewToDisplay);
svNextImageZoomView.ViewForZoomingInScrollView = GetZoomedView;
svNextImageZoomView.DidZoom += ZoomView_DidZoom;
svImagePager.AddSubview(svNextImageZoomView);
}
else
{
svNextImageZoomView = null;
}
svImagePager.SetContentOffset(new PointF(svImagePager.Frame.Width * m_currentImageDisplayIndex, 0),
false);
}
public void svImagePager_Scrolled(object sender, EventArgs e)
{
int _scrollViewDisplayIndex = (int)Math.Floor((svImagePager.ContentOffset.X + svImagePager.Frame.Width / 2) / svImagePager.Frame.Width);
if (_scrollViewDisplayIndex == m_currentImageDisplayIndex)
{
return;
}
if (_scrollViewDisplayIndex == m_currentImageDisplayIndex + 1)
{
//Set the next image as current one and load the next one
//-----------------------------------------------------
//Remove the previous image scrollview from scrollview to save memory
if (svPreviousImageZoomView != null)
{
svPreviousImageZoomView.RemoveFromSuperview();
}
//Set the previous image scrollview to the current one and set the current image scroll view to use the next one
svPreviousImageZoomView = svCurrentImageZoomView;
svCurrentImageZoomView = svNextImageZoomView;
m_currentImageDisplayIndex++;
if (m_currentImageDisplayIndex < m_questionImagesList.Count - 1)
{
//Load the next image to the scrollview
BusinessModel.Image _nextImageRecord = m_questionImagesList [m_currentImageDisplayIndex + 1];
UIImage _nextImageDataToDisplay = UIImage.FromFile(_nextImageRecord.FilePath);
UIImageView _nextImageViewToDisplay = new UIImageView(_nextImageDataToDisplay);
_nextImageViewToDisplay.Frame = new RectangleF(0, 0, _nextImageDataToDisplay.Size.Width, _nextImageDataToDisplay.Size.Height);
_nextImageViewToDisplay.UserInteractionEnabled = true;
AttachImageViewTapGestureRecognizer(_nextImageViewToDisplay);
RectangleF _nextImageScrollViewFrame = svImagePager.Frame;
_nextImageScrollViewFrame.X = _nextImageScrollViewFrame.Width * (m_currentImageDisplayIndex + 1);
_nextImageScrollViewFrame.Y = 0;
svNextImageZoomView = new UIScrollView(_nextImageScrollViewFrame);
svNextImageZoomView.AutoresizingMask = UIViewAutoresizing.All;
svNextImageZoomView.BackgroundColor = m_imageBackgroundColor;
svNextImageZoomView.ContentSize = _nextImageDataToDisplay.Size;
svNextImageZoomView.AddSubview(_nextImageViewToDisplay);
svNextImageZoomView.ViewForZoomingInScrollView = GetZoomedView;
svNextImageZoomView.DidZoom += ZoomView_DidZoom;
svImagePager.AddSubview(svNextImageZoomView);
CenterNextScrollViewImages();
SetZoomForNextScrollView();
}
else
{
//There is no next image available
svNextImageZoomView = null;
}
}
else if (_scrollViewDisplayIndex == m_currentImageDisplayIndex - 1)
{
//Set the previous image as current one and load the one before the previous image
//-----------------------------------------------------
//Remove the next image scrollview from scrollview to save memory
if (svNextImageZoomView != null)
{
svNextImageZoomView.RemoveFromSuperview();
}
//Set the next image scrollview to the current one and set the current image scroll view to use the previous one
svNextImageZoomView = svCurrentImageZoomView;
svCurrentImageZoomView = svPreviousImageZoomView;
m_currentImageDisplayIndex--;
if (m_currentImageDisplayIndex > 0)
{
//Load previous image
BusinessModel.Image _previousImageRecord = m_questionImagesList [m_currentImageDisplayIndex - 1];
UIImage _previousImageDataToDisplay = UIImage.FromFile(_previousImageRecord.FilePath);
UIImageView _previousImageViewToDisplay = new UIImageView(_previousImageDataToDisplay);
_previousImageViewToDisplay.Frame = new RectangleF(0, 0, _previousImageDataToDisplay.Size.Width, _previousImageDataToDisplay.Size.Height);
_previousImageViewToDisplay.UserInteractionEnabled = true;
AttachImageViewTapGestureRecognizer(_previousImageViewToDisplay);
RectangleF _previousImageScrollViewFrame = svImagePager.Frame;
_previousImageScrollViewFrame.X = _previousImageScrollViewFrame.Width * (m_currentImageDisplayIndex - 1);
_previousImageScrollViewFrame.Y = 0;
svPreviousImageZoomView = new UIScrollView(_previousImageScrollViewFrame);
svPreviousImageZoomView.AutoresizingMask = UIViewAutoresizing.All;
svPreviousImageZoomView.BackgroundColor = m_imageBackgroundColor;
svPreviousImageZoomView.ContentSize = _previousImageDataToDisplay.Size;
svPreviousImageZoomView.AddSubview(_previousImageViewToDisplay);
svPreviousImageZoomView.ViewForZoomingInScrollView = GetZoomedView;
svPreviousImageZoomView.DidZoom += ZoomView_DidZoom;
svImagePager.AddSubview(svPreviousImageZoomView);
CenterPreviousScrollViewImages();
SetZoomForPreviousScrollView();
}
else
{
svPreviousImageZoomView = null;
}
}
else
{
throw new Exception("Scroll view index should only return the image before or after the current image");
}
this.Title = "Figure " + m_questionImagesList [m_currentImageDisplayIndex].Title;
navBar.TopItem.Title = this.Title;
}
