Force FocusedIndexChanged when scroll

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Force FocusedIndexChanged when scroll

Post by guillaume.corneau » Wed May 20, 2020 05:20 PM

Hi,

I want to know if is possible to auto refresh the current focused index when we scroll the ImageViewer by scroll or mouse wheel

Now the focused index will be changed when I click on the visible page

I tried on then PDF Editor Demo shipped with Vintasoft installation

Thank you

Re: Force FocusedIndexChanged when scroll

Post by Alex » Thu May 21, 2020 05:22 AM

Hi,

If you need to change the focused image in image viewer asynchronously, you need to use the ImageViewer.FocusedIndex property.

If you need to change the focused image in image viewer synchronously, you need to use the ImageViewer.SetFocusedIndexSync method.

Please try to change the focused image in image viewer and let me know if you will have any question or problem.

Best regards, Alexander

Re: Force FocusedIndexChanged when scroll

Post by guillaume.corneau » Thu May 21, 2020 12:29 PM

Hi,

I added this code to ImageViewer Scroll and MouseWheel event and it works well

        private void UpdateFocusIndexWhenScroll()
        {
            var images = imageViewer1.GetVisibleImages();
            if (images.Length > 0 && imageViewer1.FocusedIndex != images[0].SourceInfo.PageIndex)
            {
                imageViewer1.DisableAutoScrollToFocusedImage();
                imageViewer1.FocusedIndex = images[0].SourceInfo.PageIndex;
                imageViewer1.EnableAutoScrollToFocusedImage();
            }
        }

        private void imageViewer1_Scroll(object sender, ScrollEventArgs e)
        {
            UpdateFocusIndexWhenScroll();
        }

        private void ImageViewer1_MouseWheel(object sender, MouseEventArgs e)
        {
            UpdateFocusIndexWhenScroll();
        }

If you have a better solution let me know

Thanks

Re: Force FocusedIndexChanged when scroll

Post by Alex » Thu May 21, 2020 01:04 PM

Hi,

I think your code is optimal.

Best regards, Alexander

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