// This method is invoked when the application has loaded and is ready to run. In this
// method you should instantiate the window, load the UI into it and then make the window
// visible.
public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
window = new UIWindow(UIScreen.MainScreen.Bounds);
// create and initialize a UICollectionViewFlowLayout
layout = new UICollectionViewFlowLayout()
{
HeaderReferenceSize = new SizeF(UIScreen.MainScreen.Bounds.Width, 50),
SectionInset = new UIEdgeInsets(10, 5, 10, 5),
MinimumInteritemSpacing = 5,
MinimumLineSpacing = 5,
ItemSize = new System.Drawing.SizeF(100, 100)
};
// create a CollectionViewController (which is a UICollectionViewController) with a layout
viewController = new CollectionViewController(layout);
// toggle the layout in response to a swipe left
swipeLeft = new UISwipeGestureRecognizer(g => {
if (customLayout == null)
{
// create and initialize a CustomLayout
customLayout = new CustomLayout(viewController.Speakers.Count)
{
ItemSize = new SizeF(100, 100)
};
}
if (viewController.CollectionView.CollectionViewLayout is UICollectionViewFlowLayout)
{
// switch to a custom layout
viewController.CollectionView.SetCollectionViewLayout(customLayout, true);
}
else
{
// invalidate the flow layout in case the orientation changed
layout.InvalidateLayout();
// switch to a flow layout
viewController.CollectionView.SetCollectionViewLayout(layout, true);
// scroll to the top
viewController.CollectionView.SetContentOffset(new PointF(0, 0), false);
}
})
{
Direction = UISwipeGestureRecognizerDirection.Left
};
// add the gesture recognizer to the UICollectionView
viewController.CollectionView.AddGestureRecognizer(swipeLeft);
window.RootViewController = viewController;
window.MakeKeyAndVisible();
return(true);
}
// This method is invoked when the application has loaded and is ready to run. In this
// method you should instantiate the window, load the UI into it and then make the window
// visible.
public override bool FinishedLaunching (UIApplication app, NSDictionary options)
{
window = new UIWindow (UIScreen.MainScreen.Bounds);
// create and initialize a UICollectionViewFlowLayout
layout = new UICollectionViewFlowLayout () {
HeaderReferenceSize = new SizeF (UIScreen.MainScreen.Bounds.Width, 50),
SectionInset = new UIEdgeInsets (10,5,10,5),
MinimumInteritemSpacing = 5,
MinimumLineSpacing = 5,
ItemSize = new System.Drawing.SizeF (100, 100)
};
// create a CollectionViewController (which is a UICollectionViewController) with a layout
viewController = new CollectionViewController (layout);
//TODO: Step 4b: uncomment to implement a left swipe gesture to switch between Collection View Layouts
// toggle the layout in response to a swipe left
swipeLeft = new UISwipeGestureRecognizer (g => {
if (customLayout == null) {
// create and initialize a CustomLayout
customLayout = new CustomLayout (viewController.Speakers.Count){
ItemSize = new SizeF (100, 100)
};
}
if (viewController.CollectionView.CollectionViewLayout is UICollectionViewFlowLayout) {
// switch to a custom layout
viewController.CollectionView.SetCollectionViewLayout (customLayout, true);
} else {
// invalidate the flow layout in case the orientation changed
layout.InvalidateLayout();
// switch to a flow layout
viewController.CollectionView.SetCollectionViewLayout (layout, true);
// scroll to the top
viewController.CollectionView.SetContentOffset(new PointF(0,0), false);
}
}){
Direction = UISwipeGestureRecognizerDirection.Left
};
// add the gesture recognizer to the UICollectionView
viewController.CollectionView.AddGestureRecognizer (swipeLeft);
window.RootViewController = viewController;
window.MakeKeyAndVisible ();
return true;
}
/// <summary>
/// Updates the padding for when we center the content in the gridview
/// </summary>
void UpdatePadding()
{
if (Element == null || (ICollection)Element.ItemsSource == null)
{
return;
}
var numberOfItems = ((ICollection)Element.ItemsSource).Count;
UICollectionViewFlowLayout flowLayout = _gridCollectionView != null ? (UICollectionViewFlowLayout)_gridCollectionView.CollectionViewLayout : null;
if (flowLayout != null)
{
if (Element.IsContentCentered && numberOfItems > 0 && _gridCollectionView.Frame.Width > 0)
{
flowLayout.InvalidateLayout();
float width = (float)_gridCollectionView.Frame.Width - 2;
int numberOfItemsThatFit = (int)Math.Floor(width / (_gridCollectionView.ItemSize.Width));
int numberOfItemsToUse = Element.CenterAsFilledRow ? numberOfItemsThatFit : (int)Math.Min(numberOfItemsThatFit, numberOfItems);
if (Element.MaxItemsPerRow != -1)
{
numberOfItemsToUse = Element.MaxItemsPerRow;
}
var remainingWidth = width - (numberOfItemsToUse * (_gridCollectionView.ItemSize.Width));
var padding = remainingWidth / (numberOfItemsToUse + 1);
Console.WriteLine(" width {0} items using {1} padding {2} iwdith {3} ", _gridCollectionView.Frame.Width, numberOfItemsToUse, padding, _gridCollectionView.ItemSize.Width);
_gridCollectionView.ColumnSpacing = padding;
_edgeInsets = new UIEdgeInsets((float)Element.ContentPaddingTop, (float)padding, (float)Element.ContentPaddingBottom, (float)padding);
Console.WriteLine("final insets " + _edgeInsets);
_gridCollectionView.ContentInset = _edgeInsets;
}
flowLayout.SectionInset = new UIEdgeInsets((float)Element.SectionPaddingTop, 0, (float)Element.SectionPaddingBottom, 0);
if (_gridCollectionView.Frame.Width > 0 && _gridCollectionView.Frame.Height > 0)
{
IsPaddingInvalid = false;
}
}
}