protected override void OnDisappearing()
{
BrowseMediaViewModel viewModel = (BrowseMediaViewModel)BindingContext;
if (viewModel.CompleteCommand.CanExecute(null))
{
viewModel.CompleteCommand.Execute(null);
}
base.OnDisappearing();
}
public BrowseMediaPage()
{
Title = ApplicationResource.PageBrowseMediaTitle;
BindingContext = new BrowseMediaViewModel(Navigation);
var browseToolbarItem = new ToolbarItem()
{
Icon = "folder.png"
};
browseToolbarItem.SetBinding(ToolbarItem.CommandProperty, new Binding("SelectImagesCommand"));
this.ToolbarItems.Add(browseToolbarItem);
/*
* // Top navigation
* var topGrid = new Grid
* {
* BackgroundColor = AppColors.HeaderColor,
* ColumnSpacing = 1,
* RowSpacing = 1
* };
*
* topGrid.RowDefinitions.Add(new RowDefinition { Height = new GridLength(64, GridUnitType.Absolute) });
* topGrid.RowDefinitions.Add(new RowDefinition { Height = new GridLength(40, GridUnitType.Absolute) });
* topGrid.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
* topGrid.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
*
*
* // Tab Label
* var tagLabel = new Label();
* tagLabel.Text = ApplicationResource.PageCreateBatchTagPrompt;
* tagLabel.HorizontalOptions = LayoutOptions.Start;
*
* // Tag Selection
* var tagPicker = new Picker();
* tagPicker.SetBinding(Picker.ItemsSourceProperty, new Binding("Tags"));
* tagPicker.SetBinding(Picker.SelectedItemProperty, new Binding("SelectedTag"));
* tagPicker.HorizontalOptions = LayoutOptions.StartAndExpand;
*/
// Collection View
// https://docs.microsoft.com/en-gb/xamarin/xamarin-forms/user-interface/collectionview/selection
var collectionView = new CollectionView {
SelectionMode = SelectionMode.Single
};
collectionView.SelectionChanged += async(object sender, SelectionChangedEventArgs e) =>
{
string action = await DisplayActionSheet(ApplicationResource.PageBrowseMediaRemovePhotoPrompt, ApplicationResource.Cancel, ApplicationResource.PageBrowseMediaRemoveConfirm);
if (action == ApplicationResource.PageBrowseMediaRemoveConfirm)
{
var targetMedia = (MediaDetails)e.CurrentSelection.FirstOrDefault();
var binding = (BindingContext as BrowseMediaViewModel);
if (binding.RemoveImageCommand.CanExecute(targetMedia))
{
binding.RemoveImageCommand.Execute(targetMedia);
}
}
};
collectionView.ItemsLayout = new GridItemsLayout(4, ItemsLayoutOrientation.Vertical);
collectionView.SetBinding(CollectionView.ItemsSourceProperty, "Media");
collectionView.ItemTemplate = new DataTemplate(() =>
{
Grid grid = new Grid();
grid.RowDefinitions.Add(new RowDefinition {
Height = GridLength.Auto
});
grid.ColumnDefinitions.Add(new ColumnDefinition {
Width = GridLength.Auto
});
var image = new CachedImage {
Aspect = Aspect.AspectFill, HeightRequest = 100, WidthRequest = 100
};
image.SetBinding(CachedImage.SourceProperty, "FullPreviewPath");
grid.Children.Add(image);
return(grid);
});
Content = new StackLayout
{
HorizontalOptions = LayoutOptions.StartAndExpand,
VerticalOptions = LayoutOptions.StartAndExpand,
Children =
{
collectionView
}
};
}
