Module javafx.graphics
Package javafx.scene.layout

Class Border


  • public final class Border
extends Object
    The Border of a Region. A Border is an immutable object which encapsulates the entire set of data required to render the border of a Region. Because this class is immutable, you can freely reuse the same Border on many different Regions. Please refer to JavaFX CSS Reference Guide for a complete description of the CSS rules for styling the border of a Region.

    Every Border is comprised of strokes and / or images. Neither list will ever be null, but either or both may be empty. When rendering, if no images are specified or no image succeeds in loading, then all strokes will be rendered in order. If any image is specified and succeeds in loading, then no strokes will be drawn, although they will still contribute to the insets and outsets of the Border.

    The Border's outsets define any extension of the drawing area of a Region which is necessary to account for all border drawing and positioning. These outsets are defined by both the BorderStrokes and BorderImages specified on this Border. Outsets are strictly non-negative.

    getInsets() are used to define the inner-most edge of all of the borders. It also is always strictly non-negative. The Region uses the insets of the Background and Border and the Region's padding to determine the Region insets, which define the content area for any children of the Region. The outsets of a Border together with the outsets of a Background and the width and height of the Region define the geometric bounds of the Region (which in turn contribute to the layoutBounds, boundsInLocal, and boundsInParent).

    A Border is most often used in cases where you want to skin the Region with an image, often used in conjunction with 9-patch scaling techniques. In such cases, you may also specify a stroked border which is only used when the image fails to load for some reason.

    Since:
    JavaFX 8.0

    • Field Detail

      • EMPTY

        public static final Border EMPTY
        An empty Border, useful to use instead of null.

    • Constructor Detail

      • Border

        public Border​(BorderStroke... strokes)
        Creates a new Border by supplying an array of BorderStrokes. This array may be null, or may contain null values. Any null values will be ignored and will not contribute to the strokes or outsets or insets.
        Parameters:
        strokes - The strokes. This may be null, and may contain nulls. Any contained nulls are filtered out and not included in the final List of strokes. A null array becomes an empty List. If both strokes and images are specified, and if any one of the images specified succeeds in loading, then no strokes are shown. In this way, strokes can be defined as a fallback in the case that an image failed to load.

      • Border

        public Border​(BorderImage... images)
        Creates a new Border by supplying an array of BorderImages. This array may be null, or may contain null values. Any null values will be ignored and will not contribute to the images or outsets or insets.
        Parameters:
        images - The images. This may be null, and may contain nulls. Any contained nulls are filtered out and not included in the final List of images. A null array becomes an empty List.

      • Border

        public Border​(List<BorderStroke> strokes,
              List<BorderImage> images)
        Creates a new Border by supplying a List of BorderStrokes and BorderImages. These Lists may be null, or may contain null values. Any null values will be ignored and will not contribute to the strokes or images, outsets, or insets.
        Parameters:
        strokes - The strokes. This may be null, and may contain nulls. Any contained nulls are filtered out and not included in the final List of strokes. A null array becomes an empty List. If both strokes and images are specified, and if any one of the images specified succeeds in loading, then no strokes are shown. In this way, strokes can be defined as a fallback in the case that an image failed to load.
        images - The images. This may be null, and may contain nulls. Any contained nulls are filtered out and not included in the final List of images. A null array becomes an empty List.

      • Border

        public Border​(BorderStroke[] strokes,
              BorderImage[] images)
        Creates a new Border by supplying an array of BorderStrokes and BorderImages. These arrays may be null, or may contain null values. Any null values will be ignored and will not contribute to the strokes or images, outsets, or insets.
        Parameters:
        strokes - The strokes. This may be null, and may contain nulls. Any contained nulls are filtered out and not included in the final List of strokes. A null array becomes an empty List. If both strokes and images are specified, and if any one of the images specified succeeds in loading, then no strokes are shown. In this way, strokes can be defined as a fallback in the case that an image failed to load.
        images - The images. This may be null, and may contain nulls. Any contained nulls are filtered out and not included in the final List of images. A null array becomes an empty List.

    • Method Detail

      • getClassCssMetaData

        public static List<CssMetaData<? extends Styleable,?>> getClassCssMetaData​()
        Returns:
        The CssMetaData associated with this class, which may include the CssMetaData of its superclasses.

      • getStrokes

        public final List<BorderStroke> getStrokes​()
        The list of BorderStrokes which together define the stroked portion of this Border. This List is unmodifiable and immutable. It will never be null. It will never contain any null elements.
        Returns:
        the list of BorderStrokes which together define the stroked portion of this Border

      • getImages

        public final List<BorderImage> getImages​()
        The list of BorderImages which together define the images to use instead of stroke for this Border. If this list is specified and at least one image within it succeeds in loading, then any specified strokes are not drawn. If this list is null or no images succeeded in loading, then any specified strokes are drawn.

        This List is unmodifiable and immutable. It will never be null. It will never contain any null elements.

        Returns:
        the list of BorderImages which together define the images to use instead of stroke for this Border

      • getOutsets

        public final Insets getOutsets​()
        The outsets of the border define the outer-most edge of the border to be drawn. The values in these outsets are strictly non-negative.
        Returns:
        the outsets of the border define the outer-most edge of the border to be drawn

      • getInsets

        public final Insets getInsets​()
        The insets define the distance from the edge of the Region to the inner-most edge of the border, if that distance is non-negative. The values in these outsets are strictly non-negative.
        Returns:
        the insets define the distance from the edge of the Region to the inner-most edge of the border

      • isEmpty

        public final boolean isEmpty​()
        Gets whether the Border is empty. It is empty if there are no strokes or images.
        Returns:
        true if the Border is empty, false otherwise.

      • equals

        public boolean equals​(Object o)
        Indicates whether some other object is "equal to" this one.

        The equals method implements an equivalence relation on non-null object references:

        • It is reflexive: for any non-null reference value x, x.equals(x) should return true.
        • It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
        • It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
        • It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
        • For any non-null reference value x, x.equals(null) should return false.

        The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).

        Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.

        Overrides:
        equals in class Object
        Parameters:
        o - the reference object with which to compare.
        Returns:
        true if this object is the same as the obj argument; false otherwise.
        See Also:
        Object.hashCode(), HashMap

      • hashCode

        public int hashCode​()
        Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by HashMap.

        The general contract of hashCode is:

        • Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
        • If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
        • It is not required that if two objects are unequal according to the Object.equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

        As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (The hashCode may or may not be implemented as some function of an object's memory address at some point in time.)

        Overrides:
        hashCode in class Object
        Returns:
        a hash code value for this object.
        See Also:
        Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)