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/*
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* Copyright 1995-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package java.awt;
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import java.util.Hashtable;
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import java.util.Vector;
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import java.util.Enumeration;
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import java.io.Serializable;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.io.ObjectStreamField;
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import java.io.IOException;
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/**
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* A <code>CardLayout</code> object is a layout manager for a
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* container. It treats each component in the container as a card.
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* Only one card is visible at a time, and the container acts as
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* a stack of cards. The first component added to a
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* <code>CardLayout</code> object is the visible component when the
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* container is first displayed.
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* <p>
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* The ordering of cards is determined by the container's own internal
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* ordering of its component objects. <code>CardLayout</code>
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* defines a set of methods that allow an application to flip
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* through these cards sequentially, or to show a specified card.
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* The {@link CardLayout#addLayoutComponent}
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* method can be used to associate a string identifier with a given card
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* for fast random access.
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*
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* @author Arthur van Hoff
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* @see java.awt.Container
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* @since JDK1.0
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*/
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public class CardLayout implements LayoutManager2,
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Serializable {
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private static final long serialVersionUID = -4328196481005934313L;
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/*
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* This creates a Vector to store associated
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* pairs of components and their names.
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* @see java.util.Vector
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*/
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Vector vector = new Vector();
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/*
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* A pair of Component and String that represents its name.
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*/
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class Card implements Serializable {
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static final long serialVersionUID = 6640330810709497518L;
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public String name;
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public Component comp;
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public Card(String cardName, Component cardComponent) {
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name = cardName;
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comp = cardComponent;
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}
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}
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/*
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* Index of Component currently displayed by CardLayout.
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*/
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int currentCard = 0;
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/*
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* A cards horizontal Layout gap (inset). It specifies
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* the space between the left and right edges of a
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* container and the current component.
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* This should be a non negative Integer.
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* @see getHgap()
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* @see setHgap()
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*/
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int hgap;
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/*
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* A cards vertical Layout gap (inset). It specifies
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* the space between the top and bottom edges of a
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* container and the current component.
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* This should be a non negative Integer.
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* @see getVgap()
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* @see setVgap()
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*/
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int vgap;
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/**
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* @serialField tab Hashtable
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* deprectated, for forward compatibility only
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* @serialField hgap int
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* @serialField vgap int
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* @serialField vector Vector
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* @serialField currentCard int
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*/
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private static final ObjectStreamField[] serialPersistentFields = {
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new ObjectStreamField("tab", Hashtable.class),
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new ObjectStreamField("hgap", Integer.TYPE),
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new ObjectStreamField("vgap", Integer.TYPE),
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new ObjectStreamField("vector", Vector.class),
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new ObjectStreamField("currentCard", Integer.TYPE)
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};
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/**
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* Creates a new card layout with gaps of size zero.
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*/
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public CardLayout() {
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this(0, 0);
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}
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/**
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* Creates a new card layout with the specified horizontal and
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* vertical gaps. The horizontal gaps are placed at the left and
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* right edges. The vertical gaps are placed at the top and bottom
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* edges.
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* @param hgap the horizontal gap.
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* @param vgap the vertical gap.
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*/
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public CardLayout(int hgap, int vgap) {
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this.hgap = hgap;
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this.vgap = vgap;
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}
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/**
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* Gets the horizontal gap between components.
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* @return the horizontal gap between components.
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* @see java.awt.CardLayout#setHgap(int)
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* @see java.awt.CardLayout#getVgap()
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* @since JDK1.1
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*/
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public int getHgap() {
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return hgap;
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}
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/**
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* Sets the horizontal gap between components.
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* @param hgap the horizontal gap between components.
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* @see java.awt.CardLayout#getHgap()
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* @see java.awt.CardLayout#setVgap(int)
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* @since JDK1.1
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*/
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public void setHgap(int hgap) {
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this.hgap = hgap;
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}
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/**
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* Gets the vertical gap between components.
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* @return the vertical gap between components.
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* @see java.awt.CardLayout#setVgap(int)
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* @see java.awt.CardLayout#getHgap()
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*/
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public int getVgap() {
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return vgap;
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}
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/**
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* Sets the vertical gap between components.
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* @param vgap the vertical gap between components.
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* @see java.awt.CardLayout#getVgap()
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* @see java.awt.CardLayout#setHgap(int)
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* @since JDK1.1
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*/
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public void setVgap(int vgap) {
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this.vgap = vgap;
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}
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/**
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* Adds the specified component to this card layout's internal
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* table of names. The object specified by <code>constraints</code>
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* must be a string. The card layout stores this string as a key-value
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* pair that can be used for random access to a particular card.
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* By calling the <code>show</code> method, an application can
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* display the component with the specified name.
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* @param comp the component to be added.
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* @param constraints a tag that identifies a particular
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* card in the layout.
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* @see java.awt.CardLayout#show(java.awt.Container, java.lang.String)
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* @exception IllegalArgumentException if the constraint is not a string.
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*/
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public void addLayoutComponent(Component comp, Object constraints) {
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synchronized (comp.getTreeLock()) {
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if (constraints == null){
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constraints = "";
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}
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if (constraints instanceof String) {
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addLayoutComponent((String)constraints, comp);
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} else {
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throw new IllegalArgumentException("cannot add to layout: constraint must be a string");
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}
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}
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}
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/**
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* @deprecated replaced by
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* <code>addLayoutComponent(Component, Object)</code>.
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*/
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@Deprecated
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public void addLayoutComponent(String name, Component comp) {
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synchronized (comp.getTreeLock()) {
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if (!vector.isEmpty()) {
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comp.setVisible(false);
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}
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for (int i=0; i < vector.size(); i++) {
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if (((Card)vector.get(i)).name.equals(name)) {
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((Card)vector.get(i)).comp = comp;
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return;
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}
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}
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vector.add(new Card(name, comp));
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}
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}
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/**
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* Removes the specified component from the layout.
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* If the card was visible on top, the next card underneath it is shown.
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* @param comp the component to be removed.
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* @see java.awt.Container#remove(java.awt.Component)
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* @see java.awt.Container#removeAll()
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*/
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public void removeLayoutComponent(Component comp) {
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synchronized (comp.getTreeLock()) {
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for (int i = 0; i < vector.size(); i++) {
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if (((Card)vector.get(i)).comp == comp) {
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// if we remove current component we should show next one
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if (comp.isVisible() && (comp.getParent() != null)) {
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next(comp.getParent());
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}
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vector.remove(i);
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// correct currentCard if this is necessary
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if (currentCard > i) {
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currentCard--;
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}
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break;
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}
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}
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}
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}
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/**
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* Determines the preferred size of the container argument using
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* this card layout.
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* @param parent the parent container in which to do the layout
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* @return the preferred dimensions to lay out the subcomponents
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* of the specified container
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* @see java.awt.Container#getPreferredSize
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* @see java.awt.CardLayout#minimumLayoutSize
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*/
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public Dimension preferredLayoutSize(Container parent) {
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synchronized (parent.getTreeLock()) {
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Insets insets = parent.getInsets();
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int ncomponents = parent.getComponentCount();
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int w = 0;
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int h = 0;
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for (int i = 0 ; i < ncomponents ; i++) {
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Component comp = parent.getComponent(i);
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Dimension d = comp.getPreferredSize();
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if (d.width > w) {
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w = d.width;
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}
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if (d.height > h) {
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h = d.height;
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}
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}
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return new Dimension(insets.left + insets.right + w + hgap*2,
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insets.top + insets.bottom + h + vgap*2);
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}
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}
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/**
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* Calculates the minimum size for the specified panel.
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* @param parent the parent container in which to do the layout
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* @return the minimum dimensions required to lay out the
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* subcomponents of the specified container
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* @see java.awt.Container#doLayout
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* @see java.awt.CardLayout#preferredLayoutSize
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*/
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public Dimension minimumLayoutSize(Container parent) {
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synchronized (parent.getTreeLock()) {
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Insets insets = parent.getInsets();
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int ncomponents = parent.getComponentCount();
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int w = 0;
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int h = 0;
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for (int i = 0 ; i < ncomponents ; i++) {
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Component comp = parent.getComponent(i);
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Dimension d = comp.getMinimumSize();
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if (d.width > w) {
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w = d.width;
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}
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if (d.height > h) {
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h = d.height;
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}
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}
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return new Dimension(insets.left + insets.right + w + hgap*2,
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insets.top + insets.bottom + h + vgap*2);
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}
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}
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/**
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* Returns the maximum dimensions for this layout given the components
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* in the specified target container.
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* @param target the component which needs to be laid out
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* @see Container
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* @see #minimumLayoutSize
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* @see #preferredLayoutSize
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*/
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public Dimension maximumLayoutSize(Container target) {
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return new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);
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}
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/**
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* Returns the alignment along the x axis. This specifies how
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* the component would like to be aligned relative to other
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* components. The value should be a number between 0 and 1
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* where 0 represents alignment along the origin, 1 is aligned
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* the furthest away from the origin, 0.5 is centered, etc.
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*/
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public float getLayoutAlignmentX(Container parent) {
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return 0.5f;
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}
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/**
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* Returns the alignment along the y axis. This specifies how
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* the component would like to be aligned relative to other
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* components. The value should be a number between 0 and 1
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* where 0 represents alignment along the origin, 1 is aligned
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* the furthest away from the origin, 0.5 is centered, etc.
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*/
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public float getLayoutAlignmentY(Container parent) {
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return 0.5f;
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}
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/**
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* Invalidates the layout, indicating that if the layout manager
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* has cached information it should be discarded.
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*/
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public void invalidateLayout(Container target) {
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}
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/**
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* Lays out the specified container using this card layout.
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* <p>
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* Each component in the <code>parent</code> container is reshaped
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* to be the size of the container, minus space for surrounding
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* insets, horizontal gaps, and vertical gaps.
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*
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* @param parent the parent container in which to do the layout
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* @see java.awt.Container#doLayout
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*/
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public void layoutContainer(Container parent) {
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synchronized (parent.getTreeLock()) {
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Insets insets = parent.getInsets();
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int ncomponents = parent.getComponentCount();
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Component comp = null;
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boolean currentFound = false;
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for (int i = 0 ; i < ncomponents ; i++) {
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comp = parent.getComponent(i);
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comp.setBounds(hgap + insets.left, vgap + insets.top,
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parent.width - (hgap*2 + insets.left + insets.right),
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parent.height - (vgap*2 + insets.top + insets.bottom));
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if (comp.isVisible()) {
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currentFound = true;
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}
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}
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if (!currentFound && ncomponents > 0) {
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parent.getComponent(0).setVisible(true);
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}
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}
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}
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/**
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* Make sure that the Container really has a CardLayout installed.
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* Otherwise havoc can ensue!
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*/
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void checkLayout(Container parent) {
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if (parent.getLayout() != this) {
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throw new IllegalArgumentException("wrong parent for CardLayout");
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}
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}
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/**
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* Flips to the first card of the container.
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* @param parent the parent container in which to do the layout
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* @see java.awt.CardLayout#last
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*/
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public void first(Container parent) {
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synchronized (parent.getTreeLock()) {
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checkLayout(parent);
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int ncomponents = parent.getComponentCount();
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for (int i = 0 ; i < ncomponents ; i++) {
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Component comp = parent.getComponent(i);
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if (comp.isVisible()) {
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comp.setVisible(false);
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break;
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}
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}
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if (ncomponents > 0) {
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currentCard = 0;
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parent.getComponent(0).setVisible(true);
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parent.validate();
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}
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}
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}
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432 |
/**
|
|
433 |
* Flips to the next card of the specified container. If the
|
|
434 |
* currently visible card is the last one, this method flips to the
|
|
435 |
* first card in the layout.
|
|
436 |
* @param parent the parent container in which to do the layout
|
|
437 |
* @see java.awt.CardLayout#previous
|
|
438 |
*/
|
|
439 |
public void next(Container parent) {
|
|
440 |
synchronized (parent.getTreeLock()) {
|
|
441 |
checkLayout(parent);
|
|
442 |
int ncomponents = parent.getComponentCount();
|
|
443 |
for (int i = 0 ; i < ncomponents ; i++) {
|
|
444 |
Component comp = parent.getComponent(i);
|
|
445 |
if (comp.isVisible()) {
|
|
446 |
comp.setVisible(false);
|
|
447 |
currentCard = (i + 1) % ncomponents;
|
|
448 |
comp = parent.getComponent(currentCard);
|
|
449 |
comp.setVisible(true);
|
|
450 |
parent.validate();
|
|
451 |
return;
|
|
452 |
}
|
|
453 |
}
|
|
454 |
showDefaultComponent(parent);
|
|
455 |
}
|
|
456 |
}
|
|
457 |
|
|
458 |
/**
|
|
459 |
* Flips to the previous card of the specified container. If the
|
|
460 |
* currently visible card is the first one, this method flips to the
|
|
461 |
* last card in the layout.
|
|
462 |
* @param parent the parent container in which to do the layout
|
|
463 |
* @see java.awt.CardLayout#next
|
|
464 |
*/
|
|
465 |
public void previous(Container parent) {
|
|
466 |
synchronized (parent.getTreeLock()) {
|
|
467 |
checkLayout(parent);
|
|
468 |
int ncomponents = parent.getComponentCount();
|
|
469 |
for (int i = 0 ; i < ncomponents ; i++) {
|
|
470 |
Component comp = parent.getComponent(i);
|
|
471 |
if (comp.isVisible()) {
|
|
472 |
comp.setVisible(false);
|
|
473 |
currentCard = ((i > 0) ? i-1 : ncomponents-1);
|
|
474 |
comp = parent.getComponent(currentCard);
|
|
475 |
comp.setVisible(true);
|
|
476 |
parent.validate();
|
|
477 |
return;
|
|
478 |
}
|
|
479 |
}
|
|
480 |
showDefaultComponent(parent);
|
|
481 |
}
|
|
482 |
}
|
|
483 |
|
|
484 |
void showDefaultComponent(Container parent) {
|
|
485 |
if (parent.getComponentCount() > 0) {
|
|
486 |
currentCard = 0;
|
|
487 |
parent.getComponent(0).setVisible(true);
|
|
488 |
parent.validate();
|
|
489 |
}
|
|
490 |
}
|
|
491 |
|
|
492 |
/**
|
|
493 |
* Flips to the last card of the container.
|
|
494 |
* @param parent the parent container in which to do the layout
|
|
495 |
* @see java.awt.CardLayout#first
|
|
496 |
*/
|
|
497 |
public void last(Container parent) {
|
|
498 |
synchronized (parent.getTreeLock()) {
|
|
499 |
checkLayout(parent);
|
|
500 |
int ncomponents = parent.getComponentCount();
|
|
501 |
for (int i = 0 ; i < ncomponents ; i++) {
|
|
502 |
Component comp = parent.getComponent(i);
|
|
503 |
if (comp.isVisible()) {
|
|
504 |
comp.setVisible(false);
|
|
505 |
break;
|
|
506 |
}
|
|
507 |
}
|
|
508 |
if (ncomponents > 0) {
|
|
509 |
currentCard = ncomponents - 1;
|
|
510 |
parent.getComponent(currentCard).setVisible(true);
|
|
511 |
parent.validate();
|
|
512 |
}
|
|
513 |
}
|
|
514 |
}
|
|
515 |
|
|
516 |
/**
|
|
517 |
* Flips to the component that was added to this layout with the
|
|
518 |
* specified <code>name</code>, using <code>addLayoutComponent</code>.
|
|
519 |
* If no such component exists, then nothing happens.
|
|
520 |
* @param parent the parent container in which to do the layout
|
|
521 |
* @param name the component name
|
|
522 |
* @see java.awt.CardLayout#addLayoutComponent(java.awt.Component, java.lang.Object)
|
|
523 |
*/
|
|
524 |
public void show(Container parent, String name) {
|
|
525 |
synchronized (parent.getTreeLock()) {
|
|
526 |
checkLayout(parent);
|
|
527 |
Component next = null;
|
|
528 |
int ncomponents = vector.size();
|
|
529 |
for (int i = 0; i < ncomponents; i++) {
|
|
530 |
Card card = (Card)vector.get(i);
|
|
531 |
if (card.name.equals(name)) {
|
|
532 |
next = card.comp;
|
|
533 |
currentCard = i;
|
|
534 |
break;
|
|
535 |
}
|
|
536 |
}
|
|
537 |
if ((next != null) && !next.isVisible()) {
|
|
538 |
ncomponents = parent.getComponentCount();
|
|
539 |
for (int i = 0; i < ncomponents; i++) {
|
|
540 |
Component comp = parent.getComponent(i);
|
|
541 |
if (comp.isVisible()) {
|
|
542 |
comp.setVisible(false);
|
|
543 |
break;
|
|
544 |
}
|
|
545 |
}
|
|
546 |
next.setVisible(true);
|
|
547 |
parent.validate();
|
|
548 |
}
|
|
549 |
}
|
|
550 |
}
|
|
551 |
|
|
552 |
/**
|
|
553 |
* Returns a string representation of the state of this card layout.
|
|
554 |
* @return a string representation of this card layout.
|
|
555 |
*/
|
|
556 |
public String toString() {
|
|
557 |
return getClass().getName() + "[hgap=" + hgap + ",vgap=" + vgap + "]";
|
|
558 |
}
|
|
559 |
|
|
560 |
/**
|
|
561 |
* Reads serializable fields from stream.
|
|
562 |
*/
|
|
563 |
private void readObject(ObjectInputStream s)
|
|
564 |
throws ClassNotFoundException, IOException
|
|
565 |
{
|
|
566 |
ObjectInputStream.GetField f = s.readFields();
|
|
567 |
|
|
568 |
hgap = f.get("hgap", 0);
|
|
569 |
vgap = f.get("vgap", 0);
|
|
570 |
|
|
571 |
if (f.defaulted("vector")) {
|
|
572 |
// pre-1.4 stream
|
|
573 |
Hashtable tab = (Hashtable)f.get("tab", null);
|
|
574 |
vector = new Vector();
|
|
575 |
if (tab != null && !tab.isEmpty()) {
|
|
576 |
for (Enumeration e = tab.keys() ; e.hasMoreElements() ; ) {
|
|
577 |
String key = (String)e.nextElement();
|
|
578 |
Component comp = (Component)tab.get(key);
|
|
579 |
vector.add(new Card(key, comp));
|
|
580 |
if (comp.isVisible()) {
|
|
581 |
currentCard = vector.size() - 1;
|
|
582 |
}
|
|
583 |
}
|
|
584 |
}
|
|
585 |
} else {
|
|
586 |
vector = (Vector)f.get("vector", null);
|
|
587 |
currentCard = f.get("currentCard", 0);
|
|
588 |
}
|
|
589 |
}
|
|
590 |
|
|
591 |
/**
|
|
592 |
* Writes serializable fields to stream.
|
|
593 |
*/
|
|
594 |
private void writeObject(ObjectOutputStream s)
|
|
595 |
throws IOException
|
|
596 |
{
|
|
597 |
Hashtable tab = new Hashtable();
|
|
598 |
int ncomponents = vector.size();
|
|
599 |
for (int i = 0; i < ncomponents; i++) {
|
|
600 |
Card card = (Card)vector.get(i);
|
|
601 |
tab.put(card.name, card.comp);
|
|
602 |
}
|
|
603 |
|
|
604 |
ObjectOutputStream.PutField f = s.putFields();
|
|
605 |
f.put("hgap", hgap);
|
|
606 |
f.put("vgap", vgap);
|
|
607 |
f.put("vector", vector);
|
|
608 |
f.put("currentCard", currentCard);
|
|
609 |
f.put("tab", tab);
|
|
610 |
s.writeFields();
|
|
611 |
}
|
|
612 |
}
|