CardLayout (Java 2 Platform SE 5.0) (original) (raw)

java.awt

Class CardLayout

java.lang.Object extended by java.awt.CardLayout

All Implemented Interfaces:

LayoutManager, LayoutManager2, Serializable

public class CardLayout

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)](../../java/awt/CardLayout.html#addLayoutComponent%28java.awt.Component, java.lang.Object%29) method can be used to associate a string identifier with a given card for fast random access.

Since:

JDK1.0

See Also:

Container, Serialized Form

Constructor Summary
CardLayout() Creates a new card layout with gaps of size zero.
[CardLayout](../../java/awt/CardLayout.html#CardLayout%28int, int%29)(int hgap, int vgap) Creates a new card layout with the specified horizontal and vertical gaps.

Method Summary
void	[addLayoutComponent](../../java/awt/CardLayout.html#addLayoutComponent%28java.awt.Component, java.lang.Object%29)(Component comp,Object constraints) Adds the specified component to this card layout's internal table of names.
void	[addLayoutComponent](../../java/awt/CardLayout.html#addLayoutComponent%28java.lang.String, java.awt.Component%29)(String name,Component comp) Deprecated. replaced byaddLayoutComponent(Component, Object).
void	first(Container parent) Flips to the first card of the container.
int	getHgap() Gets the horizontal gap between components.
float	getLayoutAlignmentX(Container parent) Returns the alignment along the x axis.
float	getLayoutAlignmentY(Container parent) Returns the alignment along the y axis.
int	getVgap() Gets the vertical gap between components.
void	invalidateLayout(Container target) Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.
void	last(Container parent) Flips to the last card of the container.
void	layoutContainer(Container parent) Lays out the specified container using this card layout.
Dimension	maximumLayoutSize(Container target) Returns the maximum dimensions for this layout given the components in the specified target container.
Dimension	minimumLayoutSize(Container parent) Calculates the minimum size for the specified panel.
void	next(Container parent) Flips to the next card of the specified container.
Dimension	preferredLayoutSize(Container parent) Determines the preferred size of the container argument using this card layout.
void	previous(Container parent) Flips to the previous card of the specified container.
void	removeLayoutComponent(Component comp) Removes the specified component from the layout.
void	setHgap(int hgap) Sets the horizontal gap between components.
void	setVgap(int vgap) Sets the vertical gap between components.
void	[show](../../java/awt/CardLayout.html#show%28java.awt.Container, java.lang.String%29)(Container parent,String name) Flips to the component that was added to this layout with the specified name, using addLayoutComponent.
String	toString() Returns a string representation of the state of this card layout.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, [wait](../../java/lang/Object.html#wait%28long, int%29)

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:

JDK1.1

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:

JDK1.1

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:

JDK1.1

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](../../java/awt/LayoutManager2.html#addLayoutComponent%28java.awt.Component, java.lang.Object%29) in interface [LayoutManager2](../../java/awt/LayoutManager2.html "interface in java.awt")

Parameters:

comp - the component to be added.

constraints - a tag that identifies a particular card in the layout.

Throws:

[IllegalArgumentException](../../java/lang/IllegalArgumentException.html "class in java.lang") - if the constraint is not a string.

See Also:

[show(java.awt.Container, java.lang.String)](../../java/awt/CardLayout.html#show%28java.awt.Container, java.lang.String%29)

addLayoutComponent

@Deprecated public void addLayoutComponent(String name, Component comp)

Deprecated. replaced byaddLayoutComponent(Component, Object).

Description copied from interface: [LayoutManager](../../java/awt/LayoutManager.html#addLayoutComponent%28java.lang.String, java.awt.Component%29)

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](../../java/awt/LayoutManager.html#addLayoutComponent%28java.lang.String, java.awt.Component%29) in interface [LayoutManager](../../java/awt/LayoutManager.html "interface in java.awt")

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.

Specified by:

[removeLayoutComponent](../../java/awt/LayoutManager.html#removeLayoutComponent%28java.awt.Component%29) in interface [LayoutManager](../../java/awt/LayoutManager.html "interface in java.awt")

Parameters:

comp - the component to be removed.

preferredLayoutSize

public Dimension preferredLayoutSize(Container parent)

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

Specified by:

[preferredLayoutSize](../../java/awt/LayoutManager.html#preferredLayoutSize%28java.awt.Container%29) in interface [LayoutManager](../../java/awt/LayoutManager.html "interface in java.awt")

Parameters:

parent - the parent container in which to do the layout

Returns:

the preferred dimensions to lay out the subcomponents of the specified container

minimumLayoutSize

public Dimension minimumLayoutSize(Container parent)

Calculates the minimum size for the specified panel.

Specified by:

[minimumLayoutSize](../../java/awt/LayoutManager.html#minimumLayoutSize%28java.awt.Container%29) in interface [LayoutManager](../../java/awt/LayoutManager.html "interface in java.awt")

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

maximumLayoutSize

public Dimension maximumLayoutSize(Container target)

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

Specified by:

[maximumLayoutSize](../../java/awt/LayoutManager2.html#maximumLayoutSize%28java.awt.Container%29) in interface [LayoutManager2](../../java/awt/LayoutManager2.html "interface in java.awt")

Parameters:

target - the component which needs to be laid out

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](../../java/awt/LayoutManager2.html#getLayoutAlignmentX%28java.awt.Container%29) in interface [LayoutManager2](../../java/awt/LayoutManager2.html "interface in java.awt")

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](../../java/awt/LayoutManager2.html#getLayoutAlignmentY%28java.awt.Container%29) in interface [LayoutManager2](../../java/awt/LayoutManager2.html "interface in java.awt")

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](../../java/awt/LayoutManager2.html#invalidateLayout%28java.awt.Container%29) in interface [LayoutManager2](../../java/awt/LayoutManager2.html "interface in java.awt")

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](../../java/awt/LayoutManager.html#layoutContainer%28java.awt.Container%29) in interface [LayoutManager](../../java/awt/LayoutManager.html "interface in java.awt")

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)

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)

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)](../../java/awt/CardLayout.html#addLayoutComponent%28java.awt.Component, java.lang.Object%29)

toString

public String toString()

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

Overrides:

[toString](../../java/lang/Object.html#toString%28%29) in class [Object](../../java/lang/Object.html "class in java.lang")

Returns:

a string representation of this card layout.

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.