/*
* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.swing;
import java.awt.Container;
import java.awt.Insets;
import javax.swing.*;
import javax.swing.LayoutStyle.ComponentPlacement;
import javax.swing.border.Border;
import javax.swing.plaf.UIResource;
/**
* An implementation of <code>LayoutStyle</code> that returns 6 for related
* components, otherwise 12. This class also provides helper methods for
* subclasses.
*
*/
public class DefaultLayoutStyle extends LayoutStyle {
private static final DefaultLayoutStyle INSTANCE =
new DefaultLayoutStyle();
public static LayoutStyle getInstance() {
return INSTANCE;
}
@Override
public int getPreferredGap(JComponent component1, JComponent component2,
ComponentPlacement type, int position, Container parent) {
if (component1 == null || component2 == null || type == null) {
throw new NullPointerException();
}
if (type == ComponentPlacement.INDENT &&
(position == SwingConstants.EAST ||
position == SwingConstants.WEST)) {
int indent = getIndent(component1, position);
if (indent > 0) {
return indent;
}
}
return (type == ComponentPlacement.UNRELATED) ? 12 : 6;
}
@Override
public int getContainerGap(JComponent component, int position,
Container parent) {
if (component == null) {
throw new NullPointerException();
}
checkPosition(position);
return 6;
}
/**
* Returns true if the classes identify a JLabel and a non-JLabel
* along the horizontal axis.
*/
protected boolean isLabelAndNonlabel(JComponent c1, JComponent c2,
int position) {
if (position == SwingConstants.EAST ||
position == SwingConstants.WEST) {
boolean c1Label = (c1 instanceof JLabel);
boolean c2Label = (c2 instanceof JLabel);
return ((c1Label || c2Label) && (c1Label != c2Label));
}
return false;
}
/**
* For some look and feels check boxs and radio buttons typically
* don't paint the border, yet they have padding for a border. Look
* and feel guidelines generally don't include this space. Use
* this method to subtract this space from the specified
* components.
*
* @param source First component
* @param target Second component
* @param position Position doing layout along.
* @param offset Ideal offset, not including border/margin
* @return offset - border/margin around the component.
*/
protected int getButtonGap(JComponent source, JComponent target,
int position, int offset) {
offset -= getButtonGap(source, position);
if (offset > 0) {
offset -= getButtonGap(target, flipDirection(position));
}
if (offset < 0) {
return 0;
}
return offset;
}
/**
* For some look and feels check boxs and radio buttons typically
* don't paint the border, yet they have padding for a border. Look
* and feel guidelines generally don't include this space. Use
* this method to subtract this space from the specified
* components.
*
* @param source Component
* @param position Position doing layout along.
* @param offset Ideal offset, not including border/margin
* @return offset - border/margin around the component.
*/
protected int getButtonGap(JComponent source, int position, int offset) {
offset -= getButtonGap(source, position);
return Math.max(offset, 0);
}
/**
* If <code>c</code> is a check box or radio button, and the border is
* not painted this returns the inset along the specified axis.
*/
public int getButtonGap(JComponent c, int position) {
String classID = c.getUIClassID();
if ((classID == "CheckBoxUI" || classID == "RadioButtonUI") &&
!((AbstractButton)c).isBorderPainted()) {
Border border = c.getBorder();
if (border instanceof UIResource) {
return getInset(c, position);
}
}
return 0;
}
private void checkPosition(int position) {
if (position != SwingConstants.NORTH &&
position != SwingConstants.SOUTH &&
position != SwingConstants.WEST &&
position != SwingConstants.EAST) {
throw new IllegalArgumentException();
}
}
protected int flipDirection(int position) {
switch(position) {
case SwingConstants.NORTH:
return SwingConstants.SOUTH;
case SwingConstants.SOUTH:
return SwingConstants.NORTH;
case SwingConstants.EAST:
return SwingConstants.WEST;
case SwingConstants.WEST:
return SwingConstants.EAST;
}
assert false;
return 0;
}
/**
* Returns the amount to indent the specified component if it's
* a JCheckBox or JRadioButton. If the component is not a JCheckBox or
* JRadioButton, 0 will be returned.
*/
protected int getIndent(JComponent c, int position) {
String classID = c.getUIClassID();
if (classID == "CheckBoxUI" || classID == "RadioButtonUI") {
AbstractButton button = (AbstractButton)c;
Insets insets = c.getInsets();
Icon icon = getIcon(button);
int gap = button.getIconTextGap();
if (isLeftAligned(button, position)) {
return insets.left + icon.getIconWidth() + gap;
} else if (isRightAligned(button, position)) {
return insets.right + icon.getIconWidth() + gap;
}
}
return 0;
}
private Icon getIcon(AbstractButton button) {
Icon icon = button.getIcon();
if (icon != null) {
return icon;
}
String key = null;
if (button instanceof JCheckBox) {
key = "CheckBox.icon";
} else if (button instanceof JRadioButton) {
key = "RadioButton.icon";
}
if (key != null) {
Object oIcon = UIManager.get(key);
if (oIcon instanceof Icon) {
return (Icon)oIcon;
}
}
return null;
}
private boolean isLeftAligned(AbstractButton button, int position) {
if (position == SwingConstants.WEST) {
boolean ltr = button.getComponentOrientation().isLeftToRight();
int hAlign = button.getHorizontalAlignment();
return ((ltr && (hAlign == SwingConstants.LEFT ||
hAlign == SwingConstants.LEADING)) ||
(!ltr && (hAlign == SwingConstants.TRAILING)));
}
return false;
}
private boolean isRightAligned(AbstractButton button, int position) {
if (position == SwingConstants.EAST) {
boolean ltr = button.getComponentOrientation().isLeftToRight();
int hAlign = button.getHorizontalAlignment();
return ((ltr && (hAlign == SwingConstants.RIGHT ||
hAlign == SwingConstants.TRAILING)) ||
(!ltr && (hAlign == SwingConstants.LEADING)));
}
return false;
}
private int getInset(JComponent c, int position) {
return getInset(c.getInsets(), position);
}
private int getInset(Insets insets, int position) {
if (insets == null) {
return 0;
}
switch(position) {
case SwingConstants.NORTH:
return insets.top;
case SwingConstants.SOUTH:
return insets.bottom;
case SwingConstants.EAST:
return insets.right;
case SwingConstants.WEST:
return insets.left;
}
assert false;
return 0;
}
}