/// <summary>Re-applies the src.</summary>
public void UpdateSrc()
{
string src = null;
// Do we have an srcset?
if (SrcSet != null)
{
// Select best src from the srcset (by density only for now):
ContentEntry ce = SrcSet.BestByDensity;
if (ce != null)
{
src = ce.Src;
}
}
else
{
// Use src:
src = this["src"];
}
if (src != null)
{
src = src.Trim();
}
if (!string.IsNullOrEmpty(src))
{
// Build it as a CSS url:
src = "url(\"" + src.Replace("\"", "\\\"") + "\")";
}
// Set it now:
Style.Computed.ChangeTagProperty("background-image", src);
}
/// <summary>Adds the given location to the group with an optional descriptor.</summary>
public int Add(string src, string descriptor)
{
// 1x by default:
float descriptorValue = 1f;
int descriptorType = ContentEntry.DENSITY_DESCRIPTOR;
if (!string.IsNullOrEmpty(descriptor))
{
// First, trim it:
descriptor = descriptor.Trim();
if (descriptor.Length > 0)
{
// Get the last character - either a 'w' or 'x':
char end = descriptor[descriptor.Length - 1];
// Chop it off:
descriptor = descriptor.Substring(0, descriptor.Length - 1);
// Parse it:
float.TryParse(descriptor, out descriptorValue);
if (end == 'w')
{
// Width descriptor:
descriptorType = ContentEntry.WIDTH_DESCRIPTOR;
}
}
}
// Create the entry and add it:
ContentEntry ce = new ContentEntry();
ce.Src = src;
ce.Type = descriptorType;
ce.Descriptor = descriptorValue;
Entries.Add(ce);
return(Entries.Count - 1);
}
/// <summary>Selects the most suitable entry for the given density/ width descriptor.</summary>
public ContentEntry MostSuitable(float descriptor)
{
ContentEntry current = null;
float acceptedDelta = 0f;
// For each entry..
for (int i = 0; i < Entries.Count; i++)
{
// Get the entry:
ContentEntry entry = Entries[i];
// The difference between this device and the entry:
float ratioDelta = entry.Descriptor - descriptor;
if (ratioDelta == 0f)
{
// Insta-win:
return(entry);
}
// We want the ratioDelta that is closest to zero and ideally positive.
// So, this one 'wins' if any of these is true:
// - It's the first one
// - ratioDelta is +ve and acceptedDelta is -ve
// - ratioDelta is closer to zero than acceptedDelta
if (
current == null ||
(ratioDelta > 0f && acceptedDelta < 0f) ||
Math.Abs(ratioDelta) < Math.Abs(acceptedDelta)
)
{
current = entry;
acceptedDelta = ratioDelta;
}
}
return(current);
}