public IconTheme(
Key key = null,
IconThemeData data = null,
Widget child = null
) : base(key: key, child: child)
{
D.assert(data != null);
D.assert(child != null);
this.data = data;
}
static IconThemeData _getInheritedIconThemeData(BuildContext context)
{
IconTheme iconTheme = (IconTheme)context.inheritFromWidgetOfExactType(typeof(IconTheme));
if (iconTheme != null)
{
return(iconTheme.data);
}
return(IconThemeData.fallback());
}
public static IconThemeData of(BuildContext context)
{
IconThemeData iconThemeData = _getInheritedIconThemeData(context).resolve(context);
return(iconThemeData.isConcrete
? iconThemeData
: iconThemeData.copyWith(
size: iconThemeData.size ?? IconThemeData.fallback().size,
color: iconThemeData.color ?? IconThemeData.fallback().color,
opacity: iconThemeData.opacity ?? IconThemeData.fallback().opacity
));
}
public static Widget merge(
Key key = null,
IconThemeData data = null,
Widget child = null
)
{
return(new Builder(
builder: context => new IconTheme(
key: key,
data: _getInheritedIconThemeData(context).merge(data),
child: child
)
));
}
public override Widget build(BuildContext context)
{
IconThemeData iconTheme = IconTheme.of(context);
float iconSize = this.size ?? iconTheme.size.Value;
if (this.icon == null)
{
return(new SizedBox(width: iconSize, height: iconSize));
}
float iconOpacity = iconTheme.opacity.Value;
Color iconColor = this.color ?? iconTheme.color;
if (iconOpacity != 1.0)
{
iconColor = iconColor.withOpacity(iconColor.opacity * iconOpacity);
}
Widget iconWidget = new RichText(
overflow: TextOverflow.visible,
text: new TextSpan(
text: new string(new[] { (char)this.icon.codePoint }),
style: new TextStyle(
inherit: false,
color: iconColor,
fontSize: iconSize,
fontFamily: this.icon.fontFamily
)
)
);
return(new SizedBox(
width: iconSize,
height: iconSize,
child: new Center(
child: iconWidget
)
));
}
static IconThemeData _getInheritedIconThemeData(BuildContext context)
{
IconTheme iconTheme = (IconTheme)context.dependOnInheritedWidgetOfExactType <IconTheme>();
return(iconTheme?.data ?? IconThemeData.fallback());
}
public override Widget build(BuildContext context)
{
D.assert(this.textDirection != null || WidgetsD.debugCheckHasDirectionality(context));
TextDirection textDirection = this.textDirection ?? Directionality.of(context);
IconThemeData iconTheme = IconTheme.of(context);
float iconSize = size ?? iconTheme.size.Value;
if (icon == null)
{
return(new SizedBox(width: iconSize, height: iconSize));
}
float iconOpacity = iconTheme.opacity.Value;
Color iconColor = color ?? iconTheme.color;
if (iconOpacity != 1.0)
{
iconColor = iconColor.withOpacity(iconColor.opacity * iconOpacity);
}
Widget iconWidget = new RichText(
overflow: TextOverflow.visible, // Never clip.
textDirection: textDirection, // Since we already fetched it for the assert...
text: new TextSpan(
text: new string(new[] { (char)icon.codePoint }),
style: new TextStyle(
inherit: false,
color: iconColor,
fontSize: iconSize,
fontFamily: icon.fontFamily
)
)
);
var matrix = Matrix4.identity();
matrix.scale(-1.0f, 1.0f, 1.0f);
if (icon.matchTextDirection)
{
switch (textDirection)
{
case TextDirection.rtl:
iconWidget = new Transform(
transform: matrix,
alignment: Alignment.center,
transformHitTests: false,
child: iconWidget
);
break;
case TextDirection.ltr:
break;
}
}
return(new SizedBox(
width: iconSize,
height: iconSize,
child: new Center(
child: iconWidget
)
));
}
public static IconThemeData of(BuildContext context)
{
IconThemeData iconThemeData = _getInheritedIconThemeData(context);
return(iconThemeData.isConcrete ? iconThemeData : IconThemeData.fallback().merge(iconThemeData));
}
