Potentially a Very large Image list

[psycik]

Been doing some development on ML3 where I have an album view.

The problem is, with the album view on the All all setting, i can potentially have an extremely large list where it's also trying to load the images for each track.

On my system it fell over at 2000 items with images.

I found i can not load the images and there's no problem.

My question is, if I just wanted to load the album images for the displayed "screen", ie the displayed 1 to 6 images, or on the next page 7 to 12 images.

Is there a way of knowing what the displayed page is? Or some other trick I could use. At the moment I'm potentially looking at the option of if > x number of items, don't display images.

[McBainUK]

Isn't there a getimage() call back in the list or list item classes. Probably worth a forum search.

(sorry can't be more specific - this post is all from memory)

[JavaWiz]

Isn't there a getimage() call back in the list or list item classes. Probably worth a forum search.

(sorry can't be more specific - this post is all from memory)

Yes, the list item supports a getImage() callback method. GBPVR will call getImage() for each visible item in the list. It also has some caching logic built in to manage the loaded images.

This way, you don't have to store all the images in memory, the callback will only be called when the image needs to be displayed, and the cache will manage the number of images in memory.

[whurlston]

I ran into the same problem with my Netflix plugin. I wrote some code that will only load 15 thumbnails (selected item +/- 7) and 1 large poster (selected item). I'll send it to you later if you want.

[psycik]

That'd be great whurlston. Do you use Javawiz's tools or have rolled your own??

Email address is in my profile.

[whurlston]

I don't use the WizTools utilities. I do use GBPVRCommonUtilities but only for config (and maybe logging) info.

[psycik]

Ok, I don't use anything, means I don't have to worry about compatibilities with someone elses software - I cause myself enough problems!!

[whurlston]

It's actually 24 images I load. You will need a global variable for your current UI list called "CurrentList" but you can modify to suit. You will of course need to change a couple of things like the

Code:

Netflix.WatchNow.Movie movie = allmovies.GetMovieByID((long)item.properties["@movieid"], false, false);

Here's the C# code. Then you just call LoadPosters() as the first line in GetRenderList().

Code:

private void LoadPosters()
        {
            // Check to make sure the current UIList is not empy
            if (CurrentList != null && CurrentList.Count > 0)
            {
                //Need to clean this string up
                string ImagesFolder = string.Format("{0}{1}\\images", GBPVR.Public.PluginHelperFactory.getPluginHelper().GetSkinRootDirectory().Replace("\\skin\\", "\\Skin2\\"), getSkinSubdirectory());
                
                // Set the range from the selected item
                // This is the number of items displayed +/- 1 page.
                int mean = uiList.getSelectedItemIndex();
                int min = mean - 11;
                int max = mean + 12;
                
                // Create a list of the indexes in the range.
                List<int> visible = new List<int>();
                for (int x = min; x < max; x++) if (x > -1 && x < CurrentList.Count) visible.Add(x);
                
                // Go through the current UIList and set/clear hashed values to keep memory usage at a minimum.
                for (int x = 0; x < CurrentList.Count; x++)
                {
                    UiList.Item item = (UiList.Item)CurrentList[x];
                    
                    // A single hashed value unique to each item so I know what information I need.                    
                    Netflix.WatchNow.Movie movie = allmovies.GetMovieByID((long)item.properties["@movieid"], false, false);
                    
                    // Check if the item's index is in the range.
                    if (visible.Contains(x))
                    {
                        string scImage = string.Format("{0}\\stars\\{1:0.0}.png", ImagesFolder, movie.StarClarity);
                        string rtImage = string.Format("{0}\\ratings\\{1}.gif", ImagesFolder, movie.Rating.ToString());
                        item.properties["@description"] = Netflix.CommonUtils.ReplaceCharacters(movie.Description);
                        item.properties["@starclarityimg"] = Image.FromFile(scImage);
                        item.properties["@ratingimg"] = Image.FromFile(rtImage);
                        FileInfo thumbInfo = new FileInfo(string.Format("{0}Small\\{1}.jpg", PosterFolder, movie.ID));
                        if (thumbInfo.Exists && thumbInfo.Length > 0)
                        {
                            if (!(bool)item.properties["@thumbLoaded"])
                            {
                                try
                                {
                                    item.properties["@thumbnail"] = Image.FromFile(thumbInfo.FullName);
                                    item.properties["@thumbLoaded"] = true;
                                }
                                catch (Exception e)
                                {
                                    // log the error.
                                }
                            }
                        }
                        else
                        {
                            item.properties["@thumbnail"] = NoPosterSmall;
                            item.properties["@thumbLoaded"] = false;
                        }
                        
                        // Only load large poster if using filmstrip mode
                        if (x == mean && uiList.getViewMode() == UiList.ViewMode.MODE_FILMSTRIP)
                        {
                            FileInfo posterInfo = new FileInfo(string.Format("{0}Large\\{1}.jpg", PosterFolder, movie.ID));
                            
                            // This region is only needed if you are download downloading posters in the background.
                            #region Support Poster Download
                            if (posterInfo.Exists && posterInfo.Length > 0)
                            {
                                if ((Image)item.properties["@poster"] == NoPosterLarge || (Image)item.properties["@poster"] == null) item.properties["@poster"] = Image.FromFile(posterInfo.FullName);
                            }
                            #endregion
                            else if (thumbInfo.Exists && thumbInfo.Length > 0)
                            {
                                if (!(bool)item.properties["@posterLoaded"])
                                {
                                    try
                                    {
                                        item.properties["@poster"] = Image.FromFile(thumbInfo.FullName);
                                        item.properties["@posterLoaded"] = true;
                                    }
                                    catch (Exception e)
                                    {
                                        // log the error.
                                    }
                                }
                            }
                            else
                            {
                                item.properties["@poster"] = NoPosterLarge;
                                item.properties["@posterLoaded"] = false;
                            }
                        }
                        else
                        {
                            item.properties["@poster"] = null;
                            item.properties["@posterLoaded"] = false;
                        }
                    }
                    
                    // If the item is not in the display range, clear all non necessary hashed values.
                    else
                    {
                        item.properties["@description"] = string.Empty;
                        item.properties["@starclarityimg"] = null;
                        item.properties["@ratingimg"] = null;
                        item.properties["@thumbnail"] = null;
                        item.properties["@thumbLoaded"] = false;
                        item.properties["@poster"] = null;
                        item.properties["@posterLoaded"] = false;
                    }
                }
            }
        }

If you aren't overriding GetRenderList(), you will need to do so:

Code:

public override ArrayList GetRenderList()
        {
            LoadPosters();
            return base.GetRenderList();
        }

[psycik]

So CurrentList is the full list of items to go into the UI?

[whurlston]

Sorry, CurrentList is an ArrayList of all the items. In PopulateListWidget(), I use it in uiList.setItemList().

Code:

protected override void PopulateListWidget()
        {
            if (CurrentList == null) CurrentList = new ArrayList();
            uiList.setItemList(CurrentList);
            uiList.setNoItemsMessage("No movies available.");
            if (dlPosters != null && dlPosters.IsAlive) dlPosters.Abort();
            dlPosters = null;
            if (showPosters)
            {
                InitializePosterDownload();
            }
            uiList.setViewMode(viewMode);
        }