Module java.desktop
Package java.awt

Class CardLayout

java.lang.Object
java.awt.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 Details

    • 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 Details

    • 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

    • removeLayoutComponent

      public void removeLayoutComponent​(Component comp)
      Removes the specified component from the layout. If the card was visible on top, the next card underneath it is shown.
      Specified by:
      removeLayoutComponent in interface LayoutManager
      Parameters:
      comp - the component to be removed.
      See Also:
      Container.remove(java.awt.Component), Container.removeAll()

    • preferredLayoutSize

      public Dimension preferredLayoutSize​(Container parent)
      Determines the preferred size of the container argument using this card layout.
      Specified by:
      preferredLayoutSize in interface LayoutManager
      Parameters:
      parent - the parent container in which to do the layout
      Returns:
      the preferred dimensions to lay out the subcomponents of the specified container
      See Also:
      Container.getPreferredSize(), minimumLayoutSize(java.awt.Container)

    • minimumLayoutSize

      public Dimension minimumLayoutSize​(Container parent)
      Calculates the minimum size for the specified panel.
      Specified by:
      minimumLayoutSize in interface LayoutManager
      Parameters:
      parent - the parent container in which to do the layout
      Returns:
      the minimum dimensions required to lay out the subcomponents of the specified container
      See Also:
      Container.doLayout(), preferredLayoutSize(java.awt.Container)

    • maximumLayoutSize

      public Dimension maximumLayoutSize​(Container target)
      Returns the maximum dimensions for this layout given the components in the specified target container.
      Specified by:
      maximumLayoutSize in interface LayoutManager2
      Parameters:
      target - the component which needs to be laid out
      Returns:
      the maximum size of the container
      See Also:
      Container, minimumLayoutSize(java.awt.Container), preferredLayoutSize(java.awt.Container)

    • 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.