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JIDE Common Layer (Professional Swing Components)
/*
* @(#)JideBorderLayout.java
*
* Copyright 2002 JIDE Software Inc. All rights reserved.
* Copyright (c) 1995, 2006, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package com.jidesoft.swing;
import java.awt.*;
/**
* This is a modified version of BorderLayout. Different from BorderLayout, the TOP and BOTTOM
* component's width are same as CENTER component's width. In BorderLayout, their width are the same as the container's
* width.
*
* @see BorderLayout
*/
public class JideBorderLayout implements LayoutManager2,
java.io.Serializable {
/**
* Constructs a border layout with the horizontal gaps between components. The horizontal gap is specified by
* hgap.
*
* @serial
* @see #getHgap()
* @see #setHgap(int)
*/
int hgap;
/**
* Constructs a border layout with the vertical gaps between components. The vertical gap is specified by
* vgap.
*
* @serial
* @see #getVgap()
* @see #setVgap(int)
*/
int vgap;
/**
* Constant to specify components location to be the north portion of the border layout.
*
* @serial
* @see #getChild(String, boolean)
* @see #addLayoutComponent
* @see #getLayoutAlignmentX
* @see #getLayoutAlignmentY
* @see #removeLayoutComponent
*/
Component north;
/**
* Constant to specify components location to be the west portion of the border layout.
*
* @serial
* @see #getChild(String, boolean)
* @see #addLayoutComponent
* @see #getLayoutAlignmentX
* @see #getLayoutAlignmentY
* @see #removeLayoutComponent
*/
Component west;
/**
* Constant to specify components location to be the east portion of the border layout.
*
* @serial
* @see #getChild(String, boolean)
* @see #addLayoutComponent
* @see #getLayoutAlignmentX
* @see #getLayoutAlignmentY
* @see #removeLayoutComponent
*/
Component east;
/**
* Constant to specify components location to be the south portion of the border layout.
*
* @serial
* @see #getChild(String, boolean)
* @see #addLayoutComponent
* @see #getLayoutAlignmentX
* @see #getLayoutAlignmentY
* @see #removeLayoutComponent
*/
Component south;
/**
* Constant to specify components location to be the center portion of the border layout.
*
* @serial
* @see #getChild(String, boolean)
* @see #addLayoutComponent
* @see #getLayoutAlignmentX
* @see #getLayoutAlignmentY
* @see #removeLayoutComponent
*/
Component center;
/**
* A relative positioning constant, that can be used instead of north, south, east, west or center. mixing the two
* types of constants can lead to unpredictable results. If you use both types, the relative constants will take
* precedence. For example, if you add components using both the NORTH and
* BEFORE_FIRST_LINE constants in a container whose orientation is LEFT_TO_RIGHT, only the
* BEFORE_FIRST_LINE will be laid out. This will be the same for lastLine, firstItem, lastItem.
*
* @serial
*/
Component firstLine;
/**
* A relative positioning constant, that can be used instead of north, south, east, west or center. Please read
* Description for firstLine.
*
* @serial
*/
Component lastLine;
/**
* A relative positioning constant, that can be used instead of north, south, east, west or center. Please read
* Description for firstLine.
*
* @serial
*/
Component firstItem;
/**
* A relative positioning constant, that can be used instead of north, south, east, west or center. Please read
* Description for firstLine.
*
* @serial
*/
Component lastItem;
/**
* The north layout constraint (top of container).
*/
public static final String NORTH = "North";
/**
* The south layout constraint (bottom of container).
*/
public static final String SOUTH = "South";
/**
* The east layout constraint (right side of container).
*/
public static final String EAST = "East";
/**
* The west layout constraint (left side of container).
*/
public static final String WEST = "West";
/**
* The center layout constraint (middle of container).
*/
public static final String CENTER = "Center";
/**
* Synonym for PAGE_START. Exists for compatibility with previous versions. PAGE_START is preferred.
*
* @see #PAGE_START
* @since 1.2
*/
public static final String BEFORE_FIRST_LINE = "First";
/**
* Synonym for PAGE_END. Exists for compatibility with previous versions. PAGE_END is preferred.
*
* @see #PAGE_END
* @since 1.2
*/
public static final String AFTER_LAST_LINE = "Last";
/**
* Synonym for LINE_START. Exists for compatibility with previous versions. LINE_START is preferred.
*
* @see #LINE_START
* @since 1.2
*/
public static final String BEFORE_LINE_BEGINS = "Before";
/**
* Synonym for LINE_END. Exists for compatibility with previous versions. LINE_END is preferred.
*
* @see #LINE_END
* @since 1.2
*/
public static final String AFTER_LINE_ENDS = "After";
/**
* The component comes before the first line of the layout's content. For Western, left-to-right and top-to-bottom
* orientations, this is equivalent to NORTH.
*
* @see java.awt.Component#getComponentOrientation
* @since 1.4
*/
public static final String PAGE_START = BEFORE_FIRST_LINE;
/**
* The component comes after the last line of the layout's content. For Western, left-to-right and top-to-bottom
* orientations, this is equivalent to SOUTH.
*
* @see java.awt.Component#getComponentOrientation
* @since 1.4
*/
public static final String PAGE_END = AFTER_LAST_LINE;
/**
* The component goes at the beginning of the line direction for the layout. For Western, left-to-right and
* top-to-bottom orientations, this is equivalent to WEST.
*
* @see java.awt.Component#getComponentOrientation
* @since 1.4
*/
public static final String LINE_START = BEFORE_LINE_BEGINS;
/**
* The component goes at the end of the line direction for the layout. For Western, left-to-right and top-to-bottom
* orientations, this is equivalent to EAST.
*
* @see java.awt.Component#getComponentOrientation
* @since 1.4
*/
public static final String LINE_END = AFTER_LINE_ENDS;
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = -8658291919501921765L;
/**
* Constructs a new border layout with no gaps between components.
*/
public JideBorderLayout() {
this(0, 0);
}
/**
* Constructs a border layout with the specified gaps between components. The horizontal gap is specified by
* hgap and the vertical gap is specified by vgap.
*
* @param hgap the horizontal gap.
* @param vgap the vertical gap.
*/
public JideBorderLayout(int hgap, int vgap) {
this.hgap = hgap;
this.vgap = vgap;
}
/**
* Returns the horizontal gap between components.
*
* @since JDK1.1
*/
public int getHgap() {
return hgap;
}
/**
* Sets the horizontal gap between components.
*
* @param hgap the horizontal gap between components
* @since JDK1.1
*/
public void setHgap(int hgap) {
this.hgap = hgap;
}
/**
* Returns the vertical gap between components.
*
* @since JDK1.1
*/
public int getVgap() {
return vgap;
}
/**
* Sets the vertical gap between components.
*
* @param vgap the vertical gap between components
* @since JDK1.1
*/
public void setVgap(int vgap) {
this.vgap = vgap;
}
/**
* Adds the specified component to the layout, using the specified constraint object. For border layouts, the
* constraint must be one of the following constants: NORTH, SOUTH, EAST,
* WEST, or CENTER.
*
* Most applications do not call this method directly. This method is called when a component is added to a
* container using the Container.add method with the same argument types.
*
* @param comp the component to be added.
* @param constraints an object that specifies how and where the component is added to the layout.
* @throws IllegalArgumentException if the constraint object is not a string, or if it not one of the five specified
* constants.
* @see java.awt.Container#add(java.awt.Component, java.lang.Object)
* @since JDK1.1
*/
public void addLayoutComponent(Component comp, Object constraints) {
synchronized (comp.getTreeLock()) {
if ((constraints == null) || (constraints instanceof String)) {
addLayoutComponent((String) constraints, comp);
}
else {
throw new IllegalArgumentException("cannot add to layout: constraint must be a string (or null)");
}
}
}
/**
* @deprecated replaced by addLayoutComponent(Component, Object).
*/
@Deprecated
public void addLayoutComponent(String name, Component comp) {
synchronized (comp.getTreeLock()) {
/* Special case: treat null the same as "Center". */
if (name == null) {
name = "Center";
}
/* Assign the component to one of the known regions of the layout.
*/
if ("Center".equals(name)) {
center = comp;
}
else if ("North".equals(name)) {
north = comp;
}
else if ("South".equals(name)) {
south = comp;
}
else if ("East".equals(name)) {
east = comp;
}
else if ("West".equals(name)) {
west = comp;
}
else if (BEFORE_FIRST_LINE.equals(name)) {
firstLine = comp;
}
else if (AFTER_LAST_LINE.equals(name)) {
lastLine = comp;
}
else if (BEFORE_LINE_BEGINS.equals(name)) {
firstItem = comp;
}
else if (AFTER_LINE_ENDS.equals(name)) {
lastItem = comp;
}
else {
throw new IllegalArgumentException("cannot add to layout: unknown constraint: " + name);
}
}
}
/**
* Removes the specified component from this border layout. This method is called when a container calls its
* remove or removeAll methods. Most applications do not call this method directly.
*
* @param comp the component to be removed.
* @see java.awt.Container#remove(java.awt.Component)
* @see java.awt.Container#removeAll()
*/
public void removeLayoutComponent(Component comp) {
synchronized (comp.getTreeLock()) {
if (comp == center) {
center = null;
}
else if (comp == north) {
north = null;
}
else if (comp == south) {
south = null;
}
else if (comp == east) {
east = null;
}
else if (comp == west) {
west = null;
}
if (comp == firstLine) {
firstLine = null;
}
else if (comp == lastLine) {
lastLine = null;
}
else if (comp == firstItem) {
firstItem = null;
}
else if (comp == lastItem) {
lastItem = null;
}
}
}
/**
* Gets the component that was added using the given constraint
*
* @param constraints the desired constraint, one of CENTER, NORTH, SOUTH,
* WEST, EAST, PAGE_START, PAGE_END,
* LINE_START, LINE_END
* @return the component at the given location, or null if the location is empty
*
* @throws IllegalArgumentException if the constraint object is not one of the nine specified constants
* @see #addLayoutComponent(java.awt.Component, java.lang.Object)
* @since 1.5
*/
public Component getLayoutComponent(Object constraints) {
if (CENTER.equals(constraints)) {
return center;
}
else if (NORTH.equals(constraints)) {
return north;
}
else if (SOUTH.equals(constraints)) {
return south;
}
else if (WEST.equals(constraints)) {
return west;
}
else if (EAST.equals(constraints)) {
return east;
}
else if (PAGE_START.equals(constraints)) {
return firstLine;
}
else if (PAGE_END.equals(constraints)) {
return lastLine;
}
else if (LINE_START.equals(constraints)) {
return firstItem;
}
else if (LINE_END.equals(constraints)) {
return lastItem;
}
else {
throw new IllegalArgumentException("cannot get component: unknown constraint: " + constraints);
}
}
/**
* Returns the component that corresponds to the given constraint location based on the target
* Container's component orientation. Components added with the relative constraints
* PAGE_START, PAGE_END, LINE_START, and LINE_END take
* precedence over components added with the explicit constraints NORTH, SOUTH,
* WEST, and EAST. The Container's component orientation is used to determine
* the location of components added with LINE_START and LINE_END.
*
* @param constraints the desired absolute position, one of CENTER, NORTH,
* SOUTH, EAST, WEST
* @param target the {@code Container} used to obtain the constraint location based on the target {@code
* Container}'s component orientation.
* @return the component at the given location, or null if the location is empty
*
* @throws IllegalArgumentException if the constraint object is not one of the five specified constants
* @throws NullPointerException if the target parameter is null
* @see #addLayoutComponent(java.awt.Component, java.lang.Object)
* @since 1.5
*/
public Component getLayoutComponent(Container target, Object constraints) {
boolean ltr = target.getComponentOrientation().isLeftToRight();
Component result = null;
if (NORTH.equals(constraints)) {
result = (firstLine != null) ? firstLine : north;
}
else if (SOUTH.equals(constraints)) {
result = (lastLine != null) ? lastLine : south;
}
else if (WEST.equals(constraints)) {
result = ltr ? firstItem : lastItem;
if (result == null) {
result = west;
}
}
else if (EAST.equals(constraints)) {
result = ltr ? lastItem : firstItem;
if (result == null) {
result = east;
}
}
else if (CENTER.equals(constraints)) {
result = center;
}
else {
throw new IllegalArgumentException("cannot get component: invalid constraint: " + constraints);
}
return result;
}
/**
* Gets the constraints for the specified component
*
* @param comp the component to be queried
* @return the constraint for the specified component, or null if component is null or is not present in this
* layout
*
* @see #addLayoutComponent(java.awt.Component, java.lang.Object)
* @since 1.5
*/
public Object getConstraints(Component comp) {
//fix for 6242148 : API method java.awt.BorderLayout.getConstraints(null) should return null
if (comp == null) {
return null;
}
if (comp == center) {
return CENTER;
}
else if (comp == north) {
return NORTH;
}
else if (comp == south) {
return SOUTH;
}
else if (comp == west) {
return WEST;
}
else if (comp == east) {
return EAST;
}
else if (comp == firstLine) {
return PAGE_START;
}
else if (comp == lastLine) {
return PAGE_END;
}
else if (comp == firstItem) {
return LINE_START;
}
else if (comp == lastItem) {
return LINE_END;
}
return null;
}
/**
* Determines the minimum size of the target container using this layout manager.
*
* This method is called when a container calls its getMinimumSize method. Most applications do not
* call this method directly.
*
* @param target the container in which to do the layout.
* @return the minimum dimensions needed to lay out the subcomponents of the specified container.
*
* @see java.awt.Container
* @see java.awt.BorderLayout#preferredLayoutSize
* @see java.awt.Container#getMinimumSize()
*/
public Dimension minimumLayoutSize(Container target) {
synchronized (target.getTreeLock()) {
Dimension dim = new Dimension(0, 0);
boolean ltr = target.getComponentOrientation().isLeftToRight();
Component c = null;
if ((c = getChild(CENTER, ltr)) != null) {
Dimension d = c.getMinimumSize();
dim.width += d.width;
dim.height = Math.max(d.height, dim.height);
}
if ((c = getChild(NORTH, ltr)) != null) {
Dimension d = c.getMinimumSize();
dim.width = Math.max(d.width, dim.width);
dim.height += d.height + vgap;
}
if ((c = getChild(SOUTH, ltr)) != null) {
Dimension d = c.getMinimumSize();
dim.width = Math.max(d.width, dim.width);
dim.height += d.height + vgap;
}
if ((c = getChild(EAST, ltr)) != null) {
Dimension d = c.getMinimumSize();
dim.width += d.width + hgap;
dim.height = Math.max(d.height, dim.height);
}
if ((c = getChild(WEST, ltr)) != null) {
Dimension d = c.getMinimumSize();
dim.width += d.width + hgap;
dim.height = Math.max(d.height, dim.height);
}
Insets insets = target.getInsets();
dim.width += insets.left + insets.right;
dim.height += insets.top + insets.bottom;
return dim;
}
}
/**
* Determines the preferred size of the target container using this layout manager, based on the
* components in the container.
*
* Most applications do not call this method directly. This method is called when a container calls its
* getPreferredSize method.
*
* @param target the container in which to do the layout.
* @return the preferred dimensions to lay out the subcomponents of the specified container.
*
* @see java.awt.Container
* @see java.awt.BorderLayout#minimumLayoutSize
* @see java.awt.Container#getPreferredSize()
*/
public Dimension preferredLayoutSize(Container target) {
synchronized (target.getTreeLock()) {
Dimension dim = new Dimension(0, 0);
boolean ltr = target.getComponentOrientation().isLeftToRight();
Component c = null;
if ((c = getChild(CENTER, ltr)) != null) {
Dimension d = c.getPreferredSize();
dim.width += d.width;
dim.height = Math.max(d.height, dim.height);
}
if ((c = getChild(NORTH, ltr)) != null) {
Dimension d = c.getPreferredSize();
dim.width = Math.max(d.width, dim.width);
dim.height += d.height + vgap;
}
if ((c = getChild(SOUTH, ltr)) != null) {
Dimension d = c.getPreferredSize();
dim.width = Math.max(d.width, dim.width);
dim.height += d.height + vgap;
}
if ((c = getChild(EAST, ltr)) != null) {
Dimension d = c.getPreferredSize();
dim.width += d.width + hgap;
dim.height = Math.max(d.height, dim.height);
}
if ((c = getChild(WEST, ltr)) != null) {
Dimension d = c.getPreferredSize();
dim.width += d.width + hgap;
dim.height = Math.max(d.height, dim.height);
}
Insets insets = target.getInsets();
dim.width += insets.left + insets.right;
dim.height += insets.top + insets.bottom;
return dim;
}
}
/**
* Returns the maximum dimensions for this layout given the components in the specified target container.
*
* @param target the component which needs to be laid out
* @see Container
* @see #minimumLayoutSize
* @see #preferredLayoutSize
*/
public Dimension maximumLayoutSize(Container target) {
return new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);
}
/**
* 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.
*/
public float getLayoutAlignmentX(Container parent) {
return 0.5f;
}
/**
* 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.
*/
public float getLayoutAlignmentY(Container parent) {
return 0.5f;
}
/**
* Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.
*/
public void invalidateLayout(Container target) {
}
/**
* Lays out the container argument using this border layout.
*
* This method actually reshapes the components in the specified container in order to satisfy the constraints of
* this BorderLayout object. The NORTH and SOUTH components, if any, are
* placed at the top and bottom of the container, respectively. The WEST and EAST
* components are then placed on the left and right, respectively. Finally, the CENTER object is placed
* in any remaining space in the middle.
*
* Most applications do not call this method directly. This method is called when a container calls its
* doLayout method.
*
* @param target the container in which to do the layout.
* @see java.awt.Container
* @see java.awt.Container#doLayout()
*/
public void layoutContainer(Container target) {
synchronized (target.getTreeLock()) {
Insets insets = target.getInsets();
int top = insets.top;
int bottom = target.getHeight() - insets.bottom;
int left = insets.left;
int right = target.getWidth() - insets.right;
boolean ltr = target.getComponentOrientation().isLeftToRight();
Component north = getChild(NORTH, ltr);
Component south = getChild(SOUTH, ltr);
Component east = getChild(EAST, ltr);
Component west = getChild(WEST, ltr);
Component center = getChild(CENTER, ltr);
/*
* Include the hgap here since if the east or west components
* do not exist then there should be no gap applied
*/
int westGap = (west != null ? west.getPreferredSize().width + hgap : 0);
int eastGap = (east != null ? east.getPreferredSize().width + hgap : 0);
if (north != null) {
// north.setSize(right - left - westGap - eastGap/* - 2 * hgap*/, north.getHeight());
Dimension d = north.getPreferredSize();
north.setBounds(left + westGap/* + hgap*/,
top,
right - left - westGap - eastGap/* - 2 * hgap*/,
d.height);
top += d.height + vgap;
}
if (south != null) {
// south.setSize(right - left - westGap - eastGap/* - 2 * hgap*/, south.getHeight());
Dimension d = south.getPreferredSize();
south.setBounds(left + westGap/* + hgap*/,
bottom - d.height,
right - left - westGap - eastGap/* - 2 * hgap*/,
d.height);
bottom -= d.height + vgap;
}
if (east != null) {
east.setSize(east.getWidth(), bottom - top);
Dimension d = east.getPreferredSize();
east.setBounds(right - d.width, top, d.width, bottom - top);
right -= d.width + hgap;
}
if (west != null) {
west.setSize(west.getWidth(), bottom - top);
Dimension d = west.getPreferredSize();
west.setBounds(left, top, d.width, bottom - top);
left += d.width + hgap;
}
if (center != null) {
center.setBounds(left, top, right - left, bottom - top);
}
}
}
/**
* Get the component that corresponds to the given constraint location
*
* @param key The desired absolute position, either NORTH, SOUTH, EAST, or WEST.
* @param ltr Is the component line direction left-to-right?
*/
private Component getChild(String key, boolean ltr) {
Component result = null;
if (key == NORTH) {
result = (firstLine != null) ? firstLine : north;
}
else if (key == SOUTH) {
result = (lastLine != null) ? lastLine : south;
}
else if (key == WEST) {
result = ltr ? firstItem : lastItem;
if (result == null) {
result = west;
}
}
else if (key == EAST) {
result = ltr ? lastItem : firstItem;
if (result == null) {
result = east;
}
}
else if (key == CENTER) {
result = center;
}
if (result != null && !result.isVisible()) {
result = null;
}
return result;
}
/**
* Returns a string representation of the state of this border layout.
*
* @return a string representation of this border layout.
*/
public String toString() {
return getClass().getName() + "[hgap=" + hgap + ",vgap=" + vgap + "]";
}
}
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