//constructor
public PictureDetailViewModel(PicturesViewModel viewModel, IPicturePostStore pictureStore, IPageService pageService)
{
if (viewModel == null)
{
throw new ArgumentNullException(nameof(viewModel));
}
_pictureStore = pictureStore;
_pageService = pageService;
SaveCommand = new Command(async() => await Save());
PickPictureCommand = new Command(async() => await PickPicture());
Post = new PicturePost
{
ID = viewModel.ID,
PictureTitle = viewModel.PictureTitle,
PictureCategory = viewModel.PictureCategory,
PictureLocation = viewModel.PictureLocation,
PictureTime = viewModel.PictureTime,
PictureRating = viewModel.PictureRating,
PicturePath = viewModel.PicturePath
};
}
//when u select a post
private async Task SelectPicture(PicturesViewModel post)
{
if (post == null)
{
return;
}
SelectedPost = null;
await _pageService.PushAsync(new PicturesDetailPage(post));
}
//deleting a picture
private async Task DeletePicture(PicturesViewModel picturesViewModel)
{
if (await _pageService.DisplayAlert("Warning", $"Are you sure you want to delete {picturesViewModel.PictureTitle}?", "Yes", "No"))
{
Posts.Remove(picturesViewModel);
PicturePost contact = await _postStore.GetPicturePost(picturesViewModel.ID);
await _postStore.DeletePicturePost(contact);
}
}
//reset the picture category
private async Task ResetPictureCategory(PicturesViewModel post)
{
post.PictureCategory = "";
}
//reset the picture rating
private async Task ResetPictureRating(PicturesViewModel post)
{
post.PictureRating = 0;
}