Package ej.mwt.stylesheet.selector

Class ClassSelector

  • All Implemented Interfaces:
    Selector
    public class ClassSelector
extends java.lang.Object
implements Selector
    A class selector selects from a class. That means that the class of this selector is available in the widget classes.

    Equivalent to .class selector in CSS. Its specificity is (0,0,1,0).

    See Also:
    Widget.hasClassSelector(int), SelectorHelper

    • Constructor Summary

      Constructors 
      Constructor Description
      ClassSelector​(int classSelector)
      Creates a class selector.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean appliesToWidget​(Widget widget)
      Checks whether or not this selector applies to the given widget.
      boolean equals​(java.lang.Object obj)  
      int getClassName()
      Gets the selected class.
      int getSpecificity()
      Returns the specificity of this selector.
      int hashCode()  

      • Methods inherited from class java.lang.Object

        clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • ClassSelector

        public ClassSelector​(int classSelector)
        Creates a class selector.
        Parameters:
        classSelector - the class

    • Method Detail

      • getClassName

        public int getClassName()
        Gets the selected class.
        Returns:
        the class

      • appliesToWidget

        public boolean appliesToWidget​(Widget widget)
        Description copied from interface: Selector
        Checks whether or not this selector applies to the given widget.
        Specified by:
        appliesToWidget in interface Selector
        Parameters:
        widget - the widget to test.
        Returns:
        true if this selectors applies to the given widget, false otherwise.

      • getSpecificity

        public int getSpecificity()
        Description copied from interface: Selector
        Returns the specificity of this selector.

        The specificity allows to determine in which order the rules of a stylesheet should be applied.

        A specificity is composed of four numbers (defined by CSS2 specification):

        • count 1 if the declaration is from is a 'style' attribute rather than a rule with a selector, 0 otherwise (= a)
        • count the number of ID attributes in the selector (= b)
        • count the number of other attributes and pseudo-classes in the selector (= c)
        • count the number of widget names and pseudo-widgets in the selector (= d)
        Concatenating the four numbers a-b-c-d (in a number system with a large base) gives the specificity. In this implementation, each number is stored on a byte in an integer. SelectorHelper provides a method to compute the specificity of a selector.
        Specified by:
        getSpecificity in interface Selector
        Returns:
        the specificity of this selector.

      • equals

        public boolean equals​(@Nullable
                      java.lang.Object obj)
        Specified by:
        equals in interface Selector
        Overrides:
        equals in class java.lang.Object

      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class java.lang.Object