Exemplo n.º 1
0
        /// <summary>
        /// Updates the image set.
        /// </summary>
        /// <remarks>
        /// This fetches the list of files from Dropbox and, for each file that is an image
        /// ensures that it is in the <see cref="Images"/> property. This method contains
        /// logic to handle removing and updating files that have been deleted or updated
        /// respectively.
        /// </remarks>
        /// <returns>An asynchronous task.</returns>
        public async Task UpdateImageSet()
        {
            var initiallyEmpty = this.Images.Count == 0;

            var client = this.App.DropboxClient;

            if (client == null)
            {
                return;
            }

            var list = await client.Files.ListFolderAsync(string.Empty);

            var previous = this.Images.Select(i => i.Name).ToList();

            foreach (var entry in list.Entries.Where(e => e.IsFile))
            {
                var ext = Path.GetExtension(entry.Name).ToLowerInvariant();

                if (!IsImageExtension(ext))
                {
                    continue;
                }

                var rev      = entry.AsFile.Rev;
                var existing = this.Images.FirstOrDefault(i => i.Name == entry.Name);

                if (existing == null)
                {
                    var image = new AppImage(entry.Name, rev);
                    this.Images.Add(image);
                }
                else if (existing.Rev != entry.AsFile.Rev)
                {
                    existing.UpdateRev(rev);
                }

                previous.Remove(entry.Name);
            }

            if (initiallyEmpty && this.Images.Count > 0)
            {
                this.DoChangeImage(0);
            }
            else if (previous.Count > 0)
            {
                foreach (var name in previous)
                {
                    var existing = this.Images.FirstOrDefault(i => i.Name == name);
                    if (existing != null)
                    {
                        this.Images.Remove(existing);
                    }
                }

                this.DoChangeImage(0);
            }
        }
Exemplo n.º 2
0
        /// <summary>
        /// Handles the event raised when <see cref="App.DropboxClient"/> changes.
        /// </summary>
        /// <remarks>If the client is <c>null</c>, then this clears all data.</remarks>
        /// <param name="sender">The sender.</param>
        /// <param name="args">The <see cref="EventArgs"/> instance containing the event data.</param>
        private void AppDropboxClientChanged(object sender, EventArgs args)
        {
            if (this.App.DropboxClient == null)
            {
                this.CurrentImage  = null;
                this.PreviousImage = null;
                this.NextImage     = null;

                this.Images.Clear();

                this.NotifyPropertyChanged();
            }
            else
            {
                var t = this.UpdateImageSet();
            }
        }
Exemplo n.º 3
0
        /// <summary>
        /// Changes the currently selected image, or if no image is currently selected,
        /// selects the first.
        /// </summary>
        /// <param name="increment">The amount to change the current index by.</param>
        private void DoChangeImage(int increment)
        {
            int index = 0;

            if (this.CurrentImage == null)
            {
                if (this.Images.Count == 0)
                {
                    return;
                }
            }
            else
            {
                index = this.Images.IndexOf(this.CurrentImage);
                if (index == -1)
                {
                    index = 0;
                }

                index = (index + this.Images.Count + increment) % this.Images.Count;
            }

            this.CurrentImage = this.Images[index];
            this.NotifyPropertyChanged("CurrentImage");

            this.PreviousImage = this.Images[(index - 1 + this.Images.Count) % this.Images.Count];
            this.NotifyPropertyChanged("PreviousImage");

            this.NextImage = this.Images[(index + 1) % this.Images.Count];
            this.NotifyPropertyChanged("NextImage");

            var task = this.InvokeAsync(async() =>
            {
                await this.CurrentImage.Update();
                await this.NextImage.Update();
                await this.PreviousImage.Update();
            });
        }
Exemplo n.º 4
0
        /// <summary>
        /// Updates the image set.
        /// </summary>
        /// <remarks>
        /// This fetches the list of files from Dropbox and, for each file that is an image
        /// ensures that it is in the <see cref="Images"/> property. This method contains
        /// logic to handle removing and updating files that have been deleted or updated
        /// respectively.
        /// </remarks>
        /// <returns>An asynchronous task.</returns>
        public async Task UpdateImageSet()
        {
            var initiallyEmpty = this.Images.Count == 0;

            var client = this.App.DropboxClient;
            if (client == null)
            {
                return;
            }

            var list = await client.Files.ListFolderAsync(string.Empty);
            var previous = this.Images.Select(i => i.Name).ToList();

            foreach (var entry in list.Entries.Where(e => e.IsFile))
            {
                var ext = Path.GetExtension(entry.Name).ToLowerInvariant();

                if (!IsImageExtension(ext))
                {
                    continue;
                }

                var rev = entry.AsFile.Rev;
                var existing = this.Images.FirstOrDefault(i => i.Name == entry.Name);

                if (existing == null)
                {
                    var image = new AppImage(entry.Name, rev);
                    this.Images.Add(image);
                }
                else if (existing.Rev != entry.AsFile.Rev)
                {
                    existing.UpdateRev(rev);
                }

                previous.Remove(entry.Name);
            }

            if (initiallyEmpty && this.Images.Count > 0)
            {
                this.DoChangeImage(0);
            }
            else if (previous.Count > 0)
            {
                foreach (var name in previous)
                {
                    var existing = this.Images.FirstOrDefault(i => i.Name == name);
                    if (existing != null)
                    {
                        this.Images.Remove(existing);
                    }
                }

                this.DoChangeImage(0);
            }
        }
Exemplo n.º 5
0
        /// <summary>
        /// Changes the currently selected image, or if no image is currently selected,
        /// selects the first.
        /// </summary>
        /// <param name="increment">The amount to change the current index by.</param>
        private void DoChangeImage(int increment)
        {
            int index = 0;
            if (this.CurrentImage == null)
            {
                if (this.Images.Count == 0)
                {
                    return;
                }
            }
            else
            {
                index = this.Images.IndexOf(this.CurrentImage);
                if (index == -1)
                {
                    index = 0;
                }

                index = (index + this.Images.Count + increment) % this.Images.Count;
            }

            this.CurrentImage = this.Images[index];
            this.NotifyPropertyChanged("CurrentImage");

            this.PreviousImage = this.Images[(index - 1 + this.Images.Count) % this.Images.Count];
            this.NotifyPropertyChanged("PreviousImage");

            this.NextImage = this.Images[(index + 1) % this.Images.Count];
            this.NotifyPropertyChanged("NextImage");

            var task = this.InvokeAsync(async () =>
            {
                await this.CurrentImage.Update();
                await this.NextImage.Update();
                await this.PreviousImage.Update();
            });
        }
Exemplo n.º 6
0
        /// <summary>
        /// Handles the event raised when <see cref="App.DropboxClient"/> changes.
        /// </summary>
        /// <remarks>If the client is <c>null</c>, then this clears all data.</remarks>
        /// <param name="sender">The sender.</param>
        /// <param name="args">The <see cref="EventArgs"/> instance containing the event data.</param>
        private void AppDropboxClientChanged(object sender, EventArgs args)
        {
            if (this.App.DropboxClient == null)
            {
                this.CurrentImage = null;
                this.PreviousImage = null;
                this.NextImage = null;

                this.Images.Clear();

                this.NotifyPropertyChanged();
            }
            else
            {
                var t = this.UpdateImageSet();
            }
        }