Module java.desktop
Package java.awt

Class CardLayout

  • All Implemented Interfaces:
    LayoutManager, LayoutManager2, Serializable
    public class CardLayout
extends Object
implements LayoutManager2, Serializable
    A CardLayout object is a layout manager for a container. It treats each component in the container as a card. Only one card is visible at a time, and the container acts as a stack of cards. The first component added to a CardLayout object is the visible component when the container is first displayed.

    The ordering of cards is determined by the container's own internal ordering of its component objects. CardLayout defines a set of methods that allow an application to flip through these cards sequentially, or to show a specified card. The addLayoutComponent(java.awt.Component, java.lang.Object) method can be used to associate a string identifier with a given card for fast random access.

    Since:
    1.0
    See Also:
    Container, Serialized Form

    • Constructor Detail

      • CardLayout

        public CardLayout()
        Creates a new card layout with gaps of size zero.

      • CardLayout

        public CardLayout​(int hgap,
                  int vgap)
        Creates a new card layout with the specified horizontal and vertical gaps. The horizontal gaps are placed at the left and right edges. The vertical gaps are placed at the top and bottom edges.
        Parameters:
        hgap - the horizontal gap.
        vgap - the vertical gap.

    • Method Detail

      • getHgap

        public int getHgap()
        Gets the horizontal gap between components.
        Returns:
        the horizontal gap between components.
        Since:
        1.1
        See Also:
        setHgap(int), getVgap()

      • setHgap

        public void setHgap​(int hgap)
        Sets the horizontal gap between components.
        Parameters:
        hgap - the horizontal gap between components.
        Since:
        1.1
        See Also:
        getHgap(), setVgap(int)

      • getVgap

        public int getVgap()
        Gets the vertical gap between components.
        Returns:
        the vertical gap between components.
        See Also:
        setVgap(int), getHgap()

      • setVgap

        public void setVgap​(int vgap)
        Sets the vertical gap between components.
        Parameters:
        vgap - the vertical gap between components.
        Since:
        1.1
        See Also:
        getVgap(), setHgap(int)

      • addLayoutComponent

        public void addLayoutComponent​(Component comp,
                               Object constraints)
        Adds the specified component to this card layout's internal table of names. The object specified by constraints must be a string. The card layout stores this string as a key-value pair that can be used for random access to a particular card. By calling the show method, an application can display the component with the specified name.
        Specified by:
        addLayoutComponent in interface LayoutManager2
        Parameters:
        comp - the component to be added.
        constraints - a tag that identifies a particular card in the layout.
        Throws:
        IllegalArgumentException - if the constraint is not a string.
        See Also:
        show(java.awt.Container, java.lang.String)

      • addLayoutComponent

        @Deprecated
public void addLayoutComponent​(String name,
                               Component comp)
        Deprecated.
        replaced by addLayoutComponent(Component, Object).
        Description copied from interface: LayoutManager
        If the layout manager uses a per-component string, adds the component comp to the layout, associating it with the string specified by name.
        Specified by:
        addLayoutComponent in interface LayoutManager
        Parameters:
        name - the string to be associated with the component
        comp - the component to be added

      • getLayoutAlignmentX

        public float getLayoutAlignmentX​(Container parent)
        Returns the alignment along the x axis. This specifies how the component would like to be aligned relative to other components. The value should be a number between 0 and 1 where 0 represents alignment along the origin, 1 is aligned the furthest away from the origin, 0.5 is centered, etc.
        Specified by:
        getLayoutAlignmentX in interface LayoutManager2
        Parameters:
        parent - the target container
        Returns:
        the x-axis alignment preference

      • getLayoutAlignmentY

        public float getLayoutAlignmentY​(Container parent)
        Returns the alignment along the y axis. This specifies how the component would like to be aligned relative to other components. The value should be a number between 0 and 1 where 0 represents alignment along the origin, 1 is aligned the furthest away from the origin, 0.5 is centered, etc.
        Specified by:
        getLayoutAlignmentY in interface LayoutManager2
        Parameters:
        parent - the target container
        Returns:
        the y-axis alignment preference

      • invalidateLayout

        public void invalidateLayout​(Container target)
        Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.
        Specified by:
        invalidateLayout in interface LayoutManager2
        Parameters:
        target - the target container

      • layoutContainer

        public void layoutContainer​(Container parent)
        Lays out the specified container using this card layout.

        Each component in the parent container is reshaped to be the size of the container, minus space for surrounding insets, horizontal gaps, and vertical gaps.

        Specified by:
        layoutContainer in interface LayoutManager
        Parameters:
        parent - the parent container in which to do the layout
        See Also:
        Container.doLayout()

      • first

        public void first​(Container parent)
        Flips to the first card of the container.
        Parameters:
        parent - the parent container in which to do the layout
        See Also:
        last(java.awt.Container)

      • next

        public void next​(Container parent)
        Flips to the next card of the specified container. If the currently visible card is the last one, this method flips to the first card in the layout.
        Parameters:
        parent - the parent container in which to do the layout
        See Also:
        previous(java.awt.Container)

      • previous

        public void previous​(Container parent)
        Flips to the previous card of the specified container. If the currently visible card is the first one, this method flips to the last card in the layout.
        Parameters:
        parent - the parent container in which to do the layout
        See Also:
        next(java.awt.Container)

      • last

        public void last​(Container parent)
        Flips to the last card of the container.
        Parameters:
        parent - the parent container in which to do the layout
        See Also:
        first(java.awt.Container)

      • show

        public void show​(Container parent,
                 String name)
        Flips to the component that was added to this layout with the specified name, using addLayoutComponent. If no such component exists, then nothing happens.
        Parameters:
        parent - the parent container in which to do the layout
        name - the component name
        See Also:
        addLayoutComponent(java.awt.Component, java.lang.Object)

      • toString

        public String toString()
        Returns a string representation of the state of this card layout.
        Overrides:
        toString in class Object
        Returns:
        a string representation of this card layout.