/// <summary>
/// Static helper to show the 'empty overlay' if a business object is null
/// </summary>
/// <returns>
/// True if it was required, false if not (ie. the business object is NOT NULL)
/// </returns>
public static bool ShowIfRequired(ref EmptyOverlay emptyOverlay
, object toShow
, UIView view
, string caption
, EmptyOverlayType type)
{
if (toShow == null)
{
if (emptyOverlay == null)
{
emptyOverlay = new EmptyOverlay(view.Bounds, caption, type);
view.AddSubview(emptyOverlay);
}
return(true);
}
else
{
if (emptyOverlay != null)
{
emptyOverlay.RemoveFromSuperview();
emptyOverlay = null;
}
}
return(false);
}
public EmptyOverlay(RectangleF frame, string caption, EmptyOverlayType type) : base(frame)
{
// configurable bits
BackgroundColor = UIColor.LightGray;
AutoresizingMask = UIViewAutoresizing.FlexibleDimensions;
var imageFilename = "";
switch (type)
{
case EmptyOverlayType.Exhibitor: imageFilename = AppDelegate.ImageEmptyExhibitors; break;
case EmptyOverlayType.News: imageFilename = AppDelegate.ImageEmptyNews; break;
case EmptyOverlayType.Session: imageFilename = AppDelegate.ImageEmptySession; break;
case EmptyOverlayType.Speaker: imageFilename = AppDelegate.ImageEmptySpeaker; break;
case EmptyOverlayType.Twitter: imageFilename = AppDelegate.ImageEmptyTwitter; break;
default: imageFilename = AppDelegate.ImageEmptySession; break;
}
var img = UIImage.FromFile(imageFilename);
float labelHeight = 22;
float labelWidth = Frame.Width - 20;
// derive the center x and y
float centerX = Frame.Width / 2;
float centerY = Frame.Height / 2;
emptyImageView = new UIImageView(new RectangleF(
centerX - (img.Size.Width / 2),
centerY - img.Size.Height - 25,
img.Size.Width,
img.Size.Height
));
emptyImageView.Image = img;
emptyImageView.AutoresizingMask = UIViewAutoresizing.FlexibleMargins;
// create and configure the "Loading Data" label
emptyLabel = new UILabel(new RectangleF(
centerX - (labelWidth / 2),
centerY + 25,
labelWidth,
labelHeight
));
emptyLabel.BackgroundColor = UIColor.Clear;
emptyLabel.TextColor = UIColor.FromRGB(136, 136, 136); //UIColor.White;
emptyLabel.Font = UIFont.FromName("Helvetica-Light", AppDelegate.Font16pt);
emptyLabel.Text = caption;
emptyLabel.TextAlignment = UITextAlignment.Center;
emptyLabel.AutoresizingMask = UIViewAutoresizing.FlexibleMargins;
AddSubview(emptyImageView);
AddSubview(emptyLabel);
}
public EmptyOverlay (RectangleF frame, string caption, EmptyOverlayType type) : base (frame)
{
// configurable bits
BackgroundColor = UIColor.LightGray;
AutoresizingMask = UIViewAutoresizing.FlexibleDimensions;
var imageFilename = "";
switch (type) {
case EmptyOverlayType.Exhibitor: imageFilename = AppDelegate.ImageEmptyExhibitors; break;
case EmptyOverlayType.News: imageFilename = AppDelegate.ImageEmptyNews; break;
case EmptyOverlayType.Session: imageFilename = AppDelegate.ImageEmptySession; break;
case EmptyOverlayType.Speaker: imageFilename = AppDelegate.ImageEmptySpeaker; break;
case EmptyOverlayType.Twitter: imageFilename = AppDelegate.ImageEmptyTwitter; break;
default: imageFilename = AppDelegate.ImageEmptySession; break;
}
var img = UIImage.FromFile (imageFilename);
float labelHeight = 22;
float labelWidth = Frame.Width - 20;
// derive the center x and y
float centerX = Frame.Width / 2;
float centerY = Frame.Height / 2;
emptyImageView = new UIImageView (new RectangleF(
centerX - (img.Size.Width / 2),
centerY - img.Size.Height - 25,
img.Size.Width ,
img.Size.Height
));
emptyImageView.Image = img;
emptyImageView.AutoresizingMask = UIViewAutoresizing.FlexibleMargins;
// create and configure the "Loading Data" label
emptyLabel = new UILabel(new RectangleF (
centerX - (labelWidth / 2),
centerY + 25,
labelWidth ,
labelHeight
));
emptyLabel.BackgroundColor = UIColor.Clear;
emptyLabel.TextColor = UIColor.FromRGB(136, 136, 136); //UIColor.White;
emptyLabel.Font = UIFont.FromName ("Helvetica-Light",AppDelegate.Font16pt);
emptyLabel.Text = caption;
emptyLabel.TextAlignment = UITextAlignment.Center;
emptyLabel.AutoresizingMask = UIViewAutoresizing.FlexibleMargins;
AddSubview (emptyImageView);
AddSubview (emptyLabel);
}
/// <summary>
/// Static helper to show the 'empty overlay' if a business object is null
/// </summary>
/// <returns>
/// True if it was required, false if not (ie. the business object is NOT NULL)
/// </returns>
public static bool ShowIfRequired (ref EmptyOverlay emptyOverlay
, object toShow
, UIView view
, string caption
, EmptyOverlayType type) {
if (toShow == null) {
if (emptyOverlay == null) {
emptyOverlay = new EmptyOverlay(view.Bounds, caption, type);
view.AddSubview (emptyOverlay);
}
return true;
} else{
if (emptyOverlay != null) {
emptyOverlay.RemoveFromSuperview ();
emptyOverlay = null;
}
}
return false;
}
