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/* CardLayout.java -- Layout manager for a card stack |
// CardLayout.java - Card-based layout engine |
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Copyright (C) 1999 Free Software Foundation, Inc. |
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/* Copyright (C) 1999, 2000, 2002 Free Software Foundation |
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This file is part of GNU Classpath. |
This file is part of GNU Classpath. |
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import java.util.Enumeration; |
import java.util.Enumeration; |
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import java.util.Hashtable; |
import java.util.Hashtable; |
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import java.io.Serializable; |
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/** |
/** This class implements a card-based layout scheme. Each included |
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* This class is a layout manager that treats components as cards in |
* component is treated as a card. Only one card can be shown at a |
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* a stack. Only one is visible at a time. |
* time. This class includes methods for changing which card is |
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* |
* shown. |
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* @author Aaron M. Renn (arenn@urbanophile.com) |
* |
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*/ |
* @author Tom Tromey <tromey@redhat.com> |
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public class CardLayout implements LayoutManager2, java.io.Serializable |
* @author Aaron M. Renn (arenn@urbanophile.com) |
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/* |
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* Static Variables |
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*/ |
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// Layout size constants |
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private static final int PREF = 0; |
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private static final int MAX = 1; |
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private static final int MIN = 2; |
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// Serialization constant |
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private static final long serialVersionUID = -4328196481005934313L; |
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/*************************************************************************/ |
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/* |
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* Instance Variables |
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*/ |
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/** |
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* @serial Horitzontal gap value. |
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*/ |
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private int hgap; |
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/** |
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* @serial Vertical gap value. |
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*/ |
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private int vgap; |
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/** |
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* @serial Table of named components. |
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*/ |
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private Hashtable tab = new Hashtable(); |
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/*************************************************************************/ |
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/* |
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* Constructors |
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*/ |
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/** |
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* Initializes a new instance of <code>CardLayout</code> with horizontal |
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* and vertical gaps of 0. |
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*/ |
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public |
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CardLayout() |
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{ |
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this(0,0); |
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} |
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/*************************************************************************/ |
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/** |
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* Initializes a new instance of <code>CardLayout</code> with the specified |
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* horizontal and vertical gaps. |
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* |
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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 |
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CardLayout(int hgap, int vgap) |
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{ |
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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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/* |
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* Instance Variables |
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*/ |
*/ |
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public class CardLayout implements LayoutManager2, Serializable |
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/** |
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* Returns the horitzontal gap value. |
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* |
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* @return The horitzontal gap value. |
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*/ |
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public int |
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getHgap() |
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{ |
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return(hgap); |
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} |
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/*************************************************************************/ |
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/** |
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* Sets the horizontal gap to the specified value. |
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* |
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* @param hgap The new horizontal gap. |
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*/ |
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public void |
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setHgap(int hgap) |
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{ |
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this.hgap = hgap; |
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} |
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/*************************************************************************/ |
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/** |
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* Returns the vertical gap value. |
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* |
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* @return The vertical gap value. |
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*/ |
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public int |
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getVgap() |
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{ |
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return(vgap); |
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} |
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/*************************************************************************/ |
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/** |
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* Sets the vertical gap to the specified value. |
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* |
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* @param vgap The new vertical gap value. |
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*/ |
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public void |
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setVgap(int vgap) |
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{ |
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this.vgap = vgap; |
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} |
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/*************************************************************************/ |
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/** |
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* Adds the specified component to this object's table of components. |
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* Doing this allows random access by name. |
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* |
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* @param component The component to add. |
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* @param name The name of the component, which must be a <code>String</code>. |
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* |
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* @exception IllegalArgumentException If the name object is not a |
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* <code>String</code>. |
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*/ |
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public void |
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addLayoutComponent(Component component, Object name) |
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{ |
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if (!(name instanceof String)) |
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throw new IllegalArgumentException("Name must a string"); |
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tab.put(name, component); |
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} |
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/*************************************************************************/ |
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/** |
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* Adds the specified component to this object's table of components. |
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* Doing this allows random access by name. |
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* |
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* @param name The name of the component. |
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* @param component The component to add. |
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* |
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* @deprecated This method is deprecated in favor of |
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* <code>addLayoutComponent(Component, Object)</code>. |
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*/ |
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public void |
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addLayoutComponent(String name, Component component) |
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{ |
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addLayoutComponent(component, name); |
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} |
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/*************************************************************************/ |
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/** |
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* Removes the specified component from the table of internal names. |
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* |
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* @param Component The component to remove. |
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*/ |
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public void |
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removeLayoutComponent(Component component) |
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{ |
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Enumeration keys = tab.keys(); |
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while (keys.hasMoreElements()) |
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{ |
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String name = (String)keys.nextElement(); |
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Object obj = tab.get(name); |
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if (obj == component) |
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{ |
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tab.remove(name); |
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return; |
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} |
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} |
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} |
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/*************************************************************************/ |
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// Internal layout size calculator |
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private Dimension |
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layoutSize(Container parent, int type) |
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{ |
{ |
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int width = 0, height = 0; |
/** |
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* Initializes a new instance of <code>CardLayout</code> with horizontal |
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Component[] clist = parent.getComponents(); |
* and vertical gaps of 0. |
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if (clist.length > 0) |
*/ |
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for (int i = 0; i < clist.length; i++) |
public CardLayout () |
50 |
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{ |
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this (0, 0); |
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} |
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/** |
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* Create a new <code>CardLayout</code> object with the specified |
56 |
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* horizontal and vertical gaps. |
57 |
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* @param hgap The horizontal gap |
58 |
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* @param vgap The vertical gap |
59 |
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*/ |
60 |
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public CardLayout (int hgap, int vgap) |
61 |
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{ |
62 |
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this.hgap = hgap; |
63 |
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this.vgap = vgap; |
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this.tab = new Hashtable (); |
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} |
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/** Add a new component to the layout. The constraint must be a |
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* string which is used to name the component. This string can |
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* later be used to refer to the particular component. |
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* @param comp The component to add |
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* @param constraints The name by which the component can later be called |
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* @exception IllegalArgumentException If `constraints' is not a |
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* <code>String</code> |
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*/ |
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public void addLayoutComponent (Component comp, Object constraints) |
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{ |
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if (! (constraints instanceof String)) |
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throw new IllegalArgumentException ("Object " + constraints |
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+ " is not a string"); |
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tab.put (constraints, comp); |
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} |
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/** Add a new component to the layout. The name can be used later |
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* to refer to the component. |
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* @param name The name by which the component can later be called |
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* @param comp The component to add |
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* @deprecated This method is deprecated in favor of |
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* <code>addLayoutComponent(Component, Object)</code>. |
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*/ |
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public void addLayoutComponent (String name, Component comp) |
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{ |
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addLayoutComponent (comp, name); |
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} |
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/** Cause the first component in the container to be displayed. |
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* @param parent The parent container |
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*/ |
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public void first (Container parent) |
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{ |
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gotoComponent (parent, FIRST, null); |
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} |
102 |
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/** Return this layout manager's horizontal gap. */ |
104 |
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public int getHgap () |
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{ |
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return hgap; |
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} |
108 |
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/** Return this layout manager's x alignment. This method always |
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* returns Component.CENTER_ALIGNMENT. |
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* @param parent Container using this layout manager instance |
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*/ |
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public float getLayoutAlignmentX (Container parent) |
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{ |
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return Component.CENTER_ALIGNMENT; |
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} |
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/** Returns this layout manager's y alignment. This method always |
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* returns Component.CENTER_ALIGNMENT. |
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* @param parent Container using this layout manager instance |
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*/ |
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public float getLayoutAlignmentY (Container parent) |
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{ |
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return Component.CENTER_ALIGNMENT; |
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} |
126 |
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/** Return this layout manager's vertical gap. */ |
128 |
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public int getVgap () |
129 |
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{ |
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return vgap; |
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} |
132 |
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/** Invalidate this layout manager's state. */ |
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public void invalidateLayout (Container target) |
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{ |
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// Do nothing. |
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} |
138 |
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/** Cause the last component in the container to be displayed. |
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* @param parent The parent container |
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*/ |
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public void last (Container parent) |
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{ |
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gotoComponent (parent, LAST, null); |
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} |
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/** |
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* Lays out the container. This is done by resizing the child components |
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* to be the same size as the parent, less insets and gaps. |
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* |
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* @param parent The parent container. |
152 |
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*/ |
153 |
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public void layoutContainer (Container parent) |
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{ |
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int width = parent.width; |
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int height = parent.height; |
157 |
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Insets ins = parent.getInsets (); |
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int num = parent.ncomponents; |
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Component[] comps = parent.component; |
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int x = ins.left + hgap; |
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int y = ins.top + vgap; |
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width = width - 2 * hgap - ins.left - ins.right; |
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height = height - 2 * vgap - ins.top - ins.bottom; |
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for (int i = 0; i < num; ++i) |
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comps[i].setBounds (x, y, width, height); |
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} |
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/** Get the maximum layout size of the container. |
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* @param target The parent container |
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*/ |
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public Dimension maximumLayoutSize (Container target) |
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{ |
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// The JCL says that this returns Integer.MAX_VALUE for both |
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// dimensions. But that just seems wrong to me. |
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return getSize (target, MAX); |
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} |
181 |
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182 |
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/** Get the minimum layout size of the container. |
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* @param target The parent container |
184 |
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*/ |
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public Dimension minimumLayoutSize (Container target) |
186 |
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{ |
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return getSize (target, MIN); |
188 |
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} |
189 |
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/** Cause the next component in the container to be displayed. If |
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* this current card is the last one in the deck, the first |
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* component is displayed. |
193 |
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* @param parent The parent container |
194 |
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*/ |
195 |
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public void next (Container parent) |
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{ |
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gotoComponent (parent, NEXT, null); |
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} |
199 |
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200 |
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/** Get the preferred layout size of the container. |
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* @param target The parent container |
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*/ |
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public Dimension preferredLayoutSize (Container parent) |
204 |
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{ |
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return getSize (parent, PREF); |
206 |
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} |
207 |
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208 |
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/** Cause the previous component in the container to be displayed. |
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* If this current card is the first one in the deck, the last |
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* component is displayed. |
211 |
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* @param parent The parent container |
212 |
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*/ |
213 |
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public void previous (Container parent) |
214 |
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{ |
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gotoComponent (parent, PREV, null); |
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} |
217 |
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218 |
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/** Remove the indicated component from this layout manager. |
219 |
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* @param comp The component to remove |
220 |
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*/ |
221 |
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public void removeLayoutComponent (Component comp) |
222 |
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{ |
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Enumeration e = tab.keys (); |
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while (e.hasMoreElements ()) |
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{ |
{ |
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Component comp = clist[i]; |
Object key = e.nextElement (); |
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Dimension dim = null; |
if (tab.get (key) == comp) |
228 |
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{ |
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if (type == PREF) |
tab.remove (key); |
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dim = comp.getPreferredSize(); |
break; |
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else if (type == MAX) |
} |
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dim = comp.getMaximumSize(); |
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else if (type == MIN) |
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dim = comp.getMinimumSize(); |
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if (dim.width > width) |
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width = dim.width; |
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if (dim.height > height) |
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width = dim.height; |
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} |
} |
233 |
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} |
234 |
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Insets ins = parent.getInsets(); |
/** Set this layout manager's horizontal gap. |
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* @param hgap The new gap |
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width += (ins.left + ins.right); |
*/ |
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height += (ins.top + ins.bottom); |
public void setHgap (int hgap) |
239 |
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{ |
240 |
return(new Dimension(width, height)); |
this.hgap = hgap; |
241 |
} |
} |
242 |
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/*************************************************************************/ |
/** Set this layout manager's vertical gap. |
244 |
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* @param vgap The new gap |
245 |
/** |
*/ |
246 |
* Returns the preferred size of the container for supporting this |
public void setVgap (int vgap) |
247 |
* layout. |
{ |
248 |
* |
this.vgap = vgap; |
249 |
* @param parent The parent container. |
} |
250 |
*/ |
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251 |
public Dimension |
/** Cause the named component to be shown. If the component name is |
252 |
preferredLayoutSize(Container parent) |
* unknown, this method does nothing. |
253 |
{ |
* @param parent The parent container |
254 |
return(layoutSize(parent, PREF)); |
* @param name The name of the component to show |
255 |
} |
*/ |
256 |
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public void show (Container parent, String name) |
257 |
/*************************************************************************/ |
{ |
258 |
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Object target = tab.get (name); |
259 |
/** |
if (target != null) |
260 |
* Returns the minimum size of the container for supporting this |
gotoComponent (parent, NONE, (Component) target); |
261 |
* layout. |
} |
262 |
* |
|
263 |
* @param parent The parent container. |
/** |
264 |
*/ |
* Returns a string representation of this layout manager. |
265 |
public Dimension |
* |
266 |
minimumLayoutSize(Container parent) |
* @return A string representation of this object. |
267 |
{ |
*/ |
268 |
return(layoutSize(parent, MIN)); |
public String toString () |
269 |
} |
{ |
270 |
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return getClass ().getName () + "[" + hgap + "," + vgap + "]"; |
271 |
/*************************************************************************/ |
} |
272 |
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273 |
/** |
// This implements first(), last(), next(), and previous(). |
274 |
* Returns the maximum size of the container for supporting this |
private void gotoComponent (Container parent, int what, |
275 |
* layout. |
Component target) |
276 |
* |
{ |
277 |
* @param parent The parent container. |
int num = parent.ncomponents; |
278 |
*/ |
// This is more efficient than calling getComponents(). |
279 |
public Dimension |
Component[] comps = parent.component; |
280 |
maximumLayoutSize(Container parent) |
int choice = -1; |
281 |
{ |
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282 |
return(layoutSize(parent, MAX)); |
if (what == FIRST) |
283 |
} |
choice = 0; |
284 |
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else if (what == LAST) |
285 |
/*************************************************************************/ |
choice = num - 1; |
286 |
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else if (what >= 0) |
287 |
/** |
choice = what; |
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* Returns the X axis alignment, which is a <code>float</code> indicating |
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* where along the X axis this container wishs to position its layout. |
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* 0 indicates align to the left, 1 indicates align to the right, and 0.5 |
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* indicates align to the center. |
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* |
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* @param parent The parent container. |
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* |
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* @return The X alignment value. |
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*/ |
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public float |
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getLayoutAlignmentX(Container parent) |
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{ |
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return(parent.getAlignmentX()); |
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} |
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/*************************************************************************/ |
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/** |
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* Returns the Y axis alignment, which is a <code>float</code> indicating |
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* where along the Y axis this container wishs to position its layout. |
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* 0 indicates align to the top, 1 indicates align to the bottom, and 0.5 |
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* indicates align to the center. |
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* |
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* @param parent The parent container. |
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* |
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* @return The Y alignment value. |
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*/ |
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public float |
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getLayoutAlignmentY(Container parent) |
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{ |
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return(parent.getAlignmentY()); |
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} |
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/*************************************************************************/ |
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/** |
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* Instructs this object to discard any layout information it might |
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* have cached. |
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* |
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* @param parent The parent container. |
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*/ |
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public void |
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invalidateLayout(Container parent) |
|
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{ |
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} |
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|
|
/*************************************************************************/ |
|
|
|
|
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/** |
|
|
* Goes to the first card in the container. |
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* |
|
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* @param parent The parent container. |
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|
*/ |
|
|
public void |
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|
first(Container parent) |
|
|
{ |
|
|
Component[] clist = parent.getComponents(); |
|
|
if (clist.length > 0) |
|
|
{ |
|
|
for (int i = 0; i < clist.length; i++) |
|
|
clist[i].setVisible(false); |
|
288 |
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|
289 |
clist[0].setVisible(true); |
for (int i = 0; i < num; ++i) |
290 |
} |
{ |
291 |
} |
// If TARGET is set then we are looking for a specific |
292 |
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// component. |
293 |
/*************************************************************************/ |
if (target != null) |
294 |
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{ |
295 |
/** |
if (target == comps[i]) |
296 |
* Goes to the last card in the container. |
choice = i; |
297 |
* |
} |
298 |
* @param parent The parent container. |
|
299 |
*/ |
if (comps[i].isVisible ()) |
300 |
public void |
{ |
301 |
last(Container parent) |
if (what == NEXT) |
302 |
{ |
{ |
303 |
Component[] clist = parent.getComponents(); |
choice = i + 1; |
304 |
if (clist.length > 0) |
if (choice == num) |
305 |
{ |
choice = 0; |
306 |
for (int i = 0; i < clist.length; i++) |
} |
307 |
clist[i].setVisible(false); |
else if (what == PREV) |
308 |
|
{ |
309 |
clist[clist.length-1].setVisible(true); |
choice = i - 1; |
310 |
} |
if (choice < 0) |
311 |
} |
choice = num - 1; |
312 |
|
} |
313 |
/*************************************************************************/ |
else if (choice == i) |
314 |
|
{ |
315 |
/** |
// Do nothing if we're already looking at the right |
316 |
* Goes to the next card in the container. If this current card is the |
// component. |
317 |
* last one in the deck, the first component is displayed. |
return; |
318 |
* |
} |
319 |
* @param parent The parent container. |
comps[i].setVisible (false); |
320 |
*/ |
|
321 |
public void |
if (choice >= 0) |
322 |
next(Container parent) |
break; |
323 |
{ |
} |
324 |
Component[] clist = parent.getComponents(); |
} |
|
if (clist.length > 0) |
|
|
{ |
|
|
for (int i = 0; i < clist.length; i++) |
|
|
{ |
|
|
if (clist[i].isVisible()) |
|
|
{ |
|
|
clist[i].setVisible(false); |
|
|
|
|
|
if ((i + 1) == clist.length) |
|
|
clist[0].setVisible(true); |
|
|
else |
|
|
clist[i+1].setVisible(true); |
|
|
|
|
|
break; |
|
|
} |
|
|
} |
|
|
} |
|
|
} |
|
|
|
|
|
/*************************************************************************/ |
|
|
|
|
|
/** |
|
|
* Goes to the next card in the container. If this current card is the |
|
|
* first one in the deck, the last component is displayed. |
|
|
* |
|
|
* @param parent The parent container. |
|
|
*/ |
|
|
public void |
|
|
previous(Container parent) |
|
|
{ |
|
|
Component[] clist = parent.getComponents(); |
|
|
if (clist.length > 0) |
|
|
{ |
|
|
for (int i = 0; i < clist.length; i++) |
|
|
{ |
|
|
if (clist[i].isVisible()) |
|
|
{ |
|
|
clist[i].setVisible(false); |
|
|
|
|
|
if (i == 0) |
|
|
clist[clist.length-1].setVisible(true); |
|
|
else |
|
|
clist[i-1].setVisible(true); |
|
|
|
|
|
break; |
|
|
} |
|
|
} |
|
|
} |
|
|
} |
|
|
|
|
|
/*************************************************************************/ |
|
|
|
|
|
/** |
|
|
* Displays the specified component that was previous added by name |
|
|
* using the <code>addLayoutComponent()</code> method. If the named |
|
|
* component doesn't exist, this method returns silently. |
|
|
* |
|
|
* @param parent The parent container. |
|
|
* @param name The name of the component to display. |
|
|
*/ |
|
|
public void |
|
|
show(Container parent, String name) |
|
|
{ |
|
|
Component comp = (Component)tab.get(name); |
|
|
if (comp == null) |
|
|
return; |
|
|
|
|
|
Component[] clist = parent.getComponents(); |
|
|
if (clist.length > 0) |
|
|
{ |
|
|
for (int i = 0; i < clist.length; i++) |
|
|
{ |
|
|
if (clist[i] == comp) |
|
|
continue; |
|
|
|
|
|
if (clist[i].isVisible()) |
|
|
clist[i].setVisible(false); |
|
|
} |
|
|
} |
|
|
} |
|
|
|
|
|
/*************************************************************************/ |
|
325 |
|
|
326 |
/** |
if (choice >= 0 && choice < num) |
327 |
* Lays out the container. This is done by resizing the child components |
comps[choice].setVisible (true); |
328 |
* to be the same size as the parent, less insets and gaps. |
} |
329 |
* |
|
330 |
* @param parent The parent container. |
// Compute the size according to WHAT. |
331 |
*/ |
private Dimension getSize (Container parent, int what) |
332 |
public void |
{ |
333 |
layoutContainer(Container parent) |
int w = 0, h = 0, num = parent.ncomponents; |
334 |
{ |
Component[] comps = parent.component; |
|
Insets ins = parent.getInsets(); |
|
|
Dimension dim = parent.getSize(); |
|
|
Component[] clist = parent.getComponents(); |
|
335 |
|
|
336 |
if (clist.length > 0) |
for (int i = 0; i < num; ++i) |
|
for (int i = 0; i < clist.length; i++) |
|
337 |
{ |
{ |
338 |
int x = ins.left + hgap; |
Dimension d; |
|
int y = ins.top + vgap; |
|
|
int width = dim.width - (ins.left + ins.right + hgap); |
|
|
int height = dim.height - (ins.top + ins.bottom + vgap); |
|
339 |
|
|
340 |
clist[i].setLocation(x, y); |
if (what == MIN) |
341 |
clist[i].setSize(width, height); |
d = comps[i].getMinimumSize (); |
342 |
} |
else if (what == MAX) |
343 |
} |
d = comps[i].getMaximumSize (); |
344 |
|
else |
345 |
|
d = comps[i].getPreferredSize (); |
346 |
|
|
347 |
/*************************************************************************/ |
w = Math.max (d.width, w); |
348 |
|
h = Math.max (d.height, h); |
349 |
|
} |
350 |
|
|
351 |
/** |
Insets i = parent.getInsets (); |
352 |
* Returns a string representation of this layout manager. |
w += 2 * hgap + i.right + i.left; |
353 |
* |
h += 2 * vgap + i.bottom + i.top; |
354 |
* @return A string representation of this object. |
|
355 |
*/ |
// Handle overflow. |
356 |
public String |
if (w < 0) |
357 |
toString() |
w = Integer.MAX_VALUE; |
358 |
{ |
if (h < 0) |
359 |
return(getClass().getName()); |
h = Integer.MAX_VALUE; |
360 |
|
|
361 |
|
return new Dimension (w, h); |
362 |
|
} |
363 |
|
|
364 |
|
/** |
365 |
|
* @serial Horizontal gap value. |
366 |
|
*/ |
367 |
|
private int hgap; |
368 |
|
|
369 |
|
/** |
370 |
|
* @serial Vertical gap value. |
371 |
|
*/ |
372 |
|
private int vgap; |
373 |
|
|
374 |
|
/** |
375 |
|
* @serial Table of named components. |
376 |
|
*/ |
377 |
|
private Hashtable tab; |
378 |
|
|
379 |
|
// These constants are used by the private gotoComponent method. |
380 |
|
private int FIRST = 0; |
381 |
|
private int LAST = 1; |
382 |
|
private int NEXT = 2; |
383 |
|
private int PREV = 3; |
384 |
|
private int NONE = 4; |
385 |
|
|
386 |
|
// These constants are used by the private getSize method. |
387 |
|
private int MIN = 0; |
388 |
|
private int MAX = 1; |
389 |
|
private int PREF = 2; |
390 |
} |
} |
|
|
|
|
} // class CardLayout |
|
|
|
|