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Showing content from https://docs.oracle.com/en/java/javase/19/docs/api/java.desktop/java/awt/CardLayout.html below:

CardLayout (Java SE 19 & JDK 19)

All Implemented Interfaces:

LayoutManager, LayoutManager2, Serializable

A

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

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 Summary

  Constructors

  Creates a new card layout with gaps of size zero.

  Creates a new card layout with the specified horizontal and vertical gaps.

• Method Summary

  void

  Adds the specified component to this card layout's internal table of names.

  void

  void

  Flips to the first card of the container.

  int

  Gets the horizontal gap between components.

  float

  Returns the alignment along the x axis.

  float

  Returns the alignment along the y axis.

  int

  Gets the vertical gap between components.

  void

  Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.

  void

  Flips to the last card of the container.

  void

  Lays out the specified container using this card layout.

  Returns the maximum dimensions for this layout given the components in the specified target container.

  Calculates the minimum size for the specified panel.

  void

  Flips to the next card of the specified container.

  Determines the preferred size of the container argument using this card layout.

  void

  Flips to the previous card of the specified container.

  void

  Removes the specified component from the layout.

  void

  Sets the horizontal gap between components.

  void

  Sets the vertical gap between components.

  void

  Flips to the component that was added to this layout with the specified name, using addLayoutComponent.

  Returns a string representation of the state of this card layout.

• 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

    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

    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

    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

    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

    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)

    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

    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

    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

    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

    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

    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

    Returns a string representation of the state of this card layout.

    Overrides:

    toString in class Object

    Returns:

    a string representation of this card layout.

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