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664 lines
22 KiB
664 lines
22 KiB
/*
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* Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.awt;
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/**
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* The <code>GridBagConstraints</code> class specifies constraints
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* for components that are laid out using the
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* <code>GridBagLayout</code> class.
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*
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* @author Doug Stein
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* @author Bill Spitzak (orignial NeWS & OLIT implementation)
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* @see java.awt.GridBagLayout
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* @since JDK1.0
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*/
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public class GridBagConstraints implements Cloneable, java.io.Serializable {
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/**
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* Specifies that this component is the next-to-last component in its
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* column or row (<code>gridwidth</code>, <code>gridheight</code>),
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* or that this component be placed next to the previously added
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* component (<code>gridx</code>, <code>gridy</code>).
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* @see java.awt.GridBagConstraints#gridwidth
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* @see java.awt.GridBagConstraints#gridheight
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* @see java.awt.GridBagConstraints#gridx
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* @see java.awt.GridBagConstraints#gridy
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*/
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public static final int RELATIVE = -1;
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/**
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* Specifies that this component is the
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* last component in its column or row.
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*/
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public static final int REMAINDER = 0;
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/**
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* Do not resize the component.
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*/
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public static final int NONE = 0;
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/**
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* Resize the component both horizontally and vertically.
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*/
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public static final int BOTH = 1;
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/**
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* Resize the component horizontally but not vertically.
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*/
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public static final int HORIZONTAL = 2;
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/**
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* Resize the component vertically but not horizontally.
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*/
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public static final int VERTICAL = 3;
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/**
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* Put the component in the center of its display area.
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*/
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public static final int CENTER = 10;
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/**
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* Put the component at the top of its display area,
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* centered horizontally.
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*/
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public static final int NORTH = 11;
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/**
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* Put the component at the top-right corner of its display area.
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*/
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public static final int NORTHEAST = 12;
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/**
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* Put the component on the right side of its display area,
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* centered vertically.
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*/
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public static final int EAST = 13;
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/**
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* Put the component at the bottom-right corner of its display area.
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*/
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public static final int SOUTHEAST = 14;
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/**
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* Put the component at the bottom of its display area, centered
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* horizontally.
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*/
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public static final int SOUTH = 15;
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/**
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* Put the component at the bottom-left corner of its display area.
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*/
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public static final int SOUTHWEST = 16;
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/**
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* Put the component on the left side of its display area,
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* centered vertically.
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*/
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public static final int WEST = 17;
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/**
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* Put the component at the top-left corner of its display area.
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*/
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public static final int NORTHWEST = 18;
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/**
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* Place the component centered along the edge of its display area
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* associated with the start of a page for the current
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* {@code ComponentOrientation}. Equal to NORTH for horizontal
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* orientations.
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*/
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public static final int PAGE_START = 19;
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/**
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* Place the component centered along the edge of its display area
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* associated with the end of a page for the current
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* {@code ComponentOrientation}. Equal to SOUTH for horizontal
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* orientations.
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*/
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public static final int PAGE_END = 20;
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/**
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* Place the component centered along the edge of its display area where
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* lines of text would normally begin for the current
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* {@code ComponentOrientation}. Equal to WEST for horizontal,
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* left-to-right orientations and EAST for horizontal, right-to-left
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* orientations.
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*/
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public static final int LINE_START = 21;
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/**
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* Place the component centered along the edge of its display area where
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* lines of text would normally end for the current
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* {@code ComponentOrientation}. Equal to EAST for horizontal,
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* left-to-right orientations and WEST for horizontal, right-to-left
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* orientations.
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*/
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public static final int LINE_END = 22;
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/**
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* Place the component in the corner of its display area where
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* the first line of text on a page would normally begin for the current
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* {@code ComponentOrientation}. Equal to NORTHWEST for horizontal,
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* left-to-right orientations and NORTHEAST for horizontal, right-to-left
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* orientations.
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*/
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public static final int FIRST_LINE_START = 23;
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/**
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* Place the component in the corner of its display area where
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* the first line of text on a page would normally end for the current
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* {@code ComponentOrientation}. Equal to NORTHEAST for horizontal,
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* left-to-right orientations and NORTHWEST for horizontal, right-to-left
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* orientations.
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*/
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public static final int FIRST_LINE_END = 24;
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/**
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* Place the component in the corner of its display area where
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* the last line of text on a page would normally start for the current
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* {@code ComponentOrientation}. Equal to SOUTHWEST for horizontal,
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* left-to-right orientations and SOUTHEAST for horizontal, right-to-left
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* orientations.
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*/
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public static final int LAST_LINE_START = 25;
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/**
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* Place the component in the corner of its display area where
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* the last line of text on a page would normally end for the current
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* {@code ComponentOrientation}. Equal to SOUTHEAST for horizontal,
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* left-to-right orientations and SOUTHWEST for horizontal, right-to-left
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* orientations.
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*/
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public static final int LAST_LINE_END = 26;
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/**
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* Possible value for the <code>anchor</code> field. Specifies
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* that the component should be horizontally centered and
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* vertically aligned along the baseline of the prevailing row.
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* If the component does not have a baseline it will be vertically
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* centered.
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*
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* @since 1.6
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*/
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public static final int BASELINE = 0x100;
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/**
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* Possible value for the <code>anchor</code> field. Specifies
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* that the component should be horizontally placed along the
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* leading edge. For components with a left-to-right orientation,
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* the leading edge is the left edge. Vertically the component is
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* aligned along the baseline of the prevailing row. If the
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* component does not have a baseline it will be vertically
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* centered.
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*
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* @since 1.6
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*/
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public static final int BASELINE_LEADING = 0x200;
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/**
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* Possible value for the <code>anchor</code> field. Specifies
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* that the component should be horizontally placed along the
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* trailing edge. For components with a left-to-right
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* orientation, the trailing edge is the right edge. Vertically
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* the component is aligned along the baseline of the prevailing
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* row. If the component does not have a baseline it will be
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* vertically centered.
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*
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* @since 1.6
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*/
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public static final int BASELINE_TRAILING = 0x300;
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/**
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* Possible value for the <code>anchor</code> field. Specifies
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* that the component should be horizontally centered. Vertically
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* the component is positioned so that its bottom edge touches
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* the baseline of the starting row. If the starting row does not
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* have a baseline it will be vertically centered.
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*
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* @since 1.6
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*/
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public static final int ABOVE_BASELINE = 0x400;
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/**
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* Possible value for the <code>anchor</code> field. Specifies
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* that the component should be horizontally placed along the
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* leading edge. For components with a left-to-right orientation,
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* the leading edge is the left edge. Vertically the component is
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* positioned so that its bottom edge touches the baseline of the
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* starting row. If the starting row does not have a baseline it
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* will be vertically centered.
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*
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* @since 1.6
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*/
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public static final int ABOVE_BASELINE_LEADING = 0x500;
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/**
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* Possible value for the <code>anchor</code> field. Specifies
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* that the component should be horizontally placed along the
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* trailing edge. For components with a left-to-right
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* orientation, the trailing edge is the right edge. Vertically
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* the component is positioned so that its bottom edge touches
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* the baseline of the starting row. If the starting row does not
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* have a baseline it will be vertically centered.
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*
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* @since 1.6
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*/
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public static final int ABOVE_BASELINE_TRAILING = 0x600;
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/**
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* Possible value for the <code>anchor</code> field. Specifies
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* that the component should be horizontally centered. Vertically
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* the component is positioned so that its top edge touches the
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* baseline of the starting row. If the starting row does not
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* have a baseline it will be vertically centered.
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*
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* @since 1.6
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*/
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public static final int BELOW_BASELINE = 0x700;
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/**
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* Possible value for the <code>anchor</code> field. Specifies
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* that the component should be horizontally placed along the
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* leading edge. For components with a left-to-right orientation,
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* the leading edge is the left edge. Vertically the component is
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* positioned so that its top edge touches the baseline of the
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* starting row. If the starting row does not have a baseline it
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* will be vertically centered.
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*
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* @since 1.6
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*/
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public static final int BELOW_BASELINE_LEADING = 0x800;
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/**
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* Possible value for the <code>anchor</code> field. Specifies
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* that the component should be horizontally placed along the
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* trailing edge. For components with a left-to-right
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* orientation, the trailing edge is the right edge. Vertically
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* the component is positioned so that its top edge touches the
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* baseline of the starting row. If the starting row does not
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* have a baseline it will be vertically centered.
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*
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* @since 1.6
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*/
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public static final int BELOW_BASELINE_TRAILING = 0x900;
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/**
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* Specifies the cell containing the leading edge of the component's
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* display area, where the first cell in a row has <code>gridx=0</code>.
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* The leading edge of a component's display area is its left edge for
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* a horizontal, left-to-right container and its right edge for a
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* horizontal, right-to-left container.
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* The value
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* <code>RELATIVE</code> specifies that the component be placed
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* immediately following the component that was added to the container
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* just before this component was added.
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* <p>
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* The default value is <code>RELATIVE</code>.
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* <code>gridx</code> should be a non-negative value.
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* @serial
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* @see #clone()
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* @see java.awt.GridBagConstraints#gridy
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* @see java.awt.ComponentOrientation
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*/
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public int gridx;
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/**
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* Specifies the cell at the top of the component's display area,
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* where the topmost cell has <code>gridy=0</code>. The value
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* <code>RELATIVE</code> specifies that the component be placed just
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* below the component that was added to the container just before
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* this component was added.
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* <p>
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* The default value is <code>RELATIVE</code>.
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* <code>gridy</code> should be a non-negative value.
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* @serial
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* @see #clone()
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* @see java.awt.GridBagConstraints#gridx
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*/
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public int gridy;
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/**
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* Specifies the number of cells in a row for the component's
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* display area.
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* <p>
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* Use <code>REMAINDER</code> to specify that the component's
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* display area will be from <code>gridx</code> to the last
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* cell in the row.
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* Use <code>RELATIVE</code> to specify that the component's
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* display area will be from <code>gridx</code> to the next
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* to the last one in its row.
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* <p>
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* <code>gridwidth</code> should be non-negative and the default
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* value is 1.
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* @serial
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* @see #clone()
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* @see java.awt.GridBagConstraints#gridheight
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*/
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public int gridwidth;
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/**
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* Specifies the number of cells in a column for the component's
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* display area.
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* <p>
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* Use <code>REMAINDER</code> to specify that the component's
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* display area will be from <code>gridy</code> to the last
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* cell in the column.
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* Use <code>RELATIVE</code> to specify that the component's
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* display area will be from <code>gridy</code> to the next
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* to the last one in its column.
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* <p>
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* <code>gridheight</code> should be a non-negative value and the
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* default value is 1.
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* @serial
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* @see #clone()
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* @see java.awt.GridBagConstraints#gridwidth
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*/
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public int gridheight;
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/**
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* Specifies how to distribute extra horizontal space.
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* <p>
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* The grid bag layout manager calculates the weight of a column to
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* be the maximum <code>weightx</code> of all the components in a
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* column. If the resulting layout is smaller horizontally than the area
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* it needs to fill, the extra space is distributed to each column in
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* proportion to its weight. A column that has a weight of zero receives
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* no extra space.
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* <p>
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* If all the weights are zero, all the extra space appears between
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* the grids of the cell and the left and right edges.
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* <p>
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* The default value of this field is <code>0</code>.
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* <code>weightx</code> should be a non-negative value.
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* @serial
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* @see #clone()
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* @see java.awt.GridBagConstraints#weighty
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*/
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public double weightx;
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/**
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* Specifies how to distribute extra vertical space.
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* <p>
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* The grid bag layout manager calculates the weight of a row to be
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* the maximum <code>weighty</code> of all the components in a row.
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* If the resulting layout is smaller vertically than the area it
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* needs to fill, the extra space is distributed to each row in
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* proportion to its weight. A row that has a weight of zero receives no
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* extra space.
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* <p>
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* If all the weights are zero, all the extra space appears between
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* the grids of the cell and the top and bottom edges.
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* <p>
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* The default value of this field is <code>0</code>.
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* <code>weighty</code> should be a non-negative value.
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* @serial
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* @see #clone()
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* @see java.awt.GridBagConstraints#weightx
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*/
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public double weighty;
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/**
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* This field is used when the component is smaller than its
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* display area. It determines where, within the display area, to
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* place the component.
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* <p> There are three kinds of possible values: orientation
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* relative, baseline relative and absolute. Orientation relative
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* values are interpreted relative to the container's component
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* orientation property, baseline relative values are interpreted
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* relative to the baseline and absolute values are not. The
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* absolute values are:
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* <code>CENTER</code>, <code>NORTH</code>, <code>NORTHEAST</code>,
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* <code>EAST</code>, <code>SOUTHEAST</code>, <code>SOUTH</code>,
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* <code>SOUTHWEST</code>, <code>WEST</code>, and <code>NORTHWEST</code>.
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* The orientation relative values are: <code>PAGE_START</code>,
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* <code>PAGE_END</code>,
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* <code>LINE_START</code>, <code>LINE_END</code>,
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* <code>FIRST_LINE_START</code>, <code>FIRST_LINE_END</code>,
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* <code>LAST_LINE_START</code> and <code>LAST_LINE_END</code>. The
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* baseline relative values are:
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* <code>BASELINE</code>, <code>BASELINE_LEADING</code>,
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* <code>BASELINE_TRAILING</code>,
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* <code>ABOVE_BASELINE</code>, <code>ABOVE_BASELINE_LEADING</code>,
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* <code>ABOVE_BASELINE_TRAILING</code>,
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* <code>BELOW_BASELINE</code>, <code>BELOW_BASELINE_LEADING</code>,
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* and <code>BELOW_BASELINE_TRAILING</code>.
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* The default value is <code>CENTER</code>.
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* @serial
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* @see #clone()
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* @see java.awt.ComponentOrientation
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*/
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public int anchor;
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/**
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* This field is used when the component's display area is larger
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* than the component's requested size. It determines whether to
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* resize the component, and if so, how.
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* <p>
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* The following values are valid for <code>fill</code>:
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*
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* <ul>
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* <li>
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* <code>NONE</code>: Do not resize the component.
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* <li>
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* <code>HORIZONTAL</code>: Make the component wide enough to fill
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* its display area horizontally, but do not change its height.
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* <li>
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* <code>VERTICAL</code>: Make the component tall enough to fill its
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* display area vertically, but do not change its width.
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* <li>
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* <code>BOTH</code>: Make the component fill its display area
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* entirely.
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* </ul>
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* <p>
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* The default value is <code>NONE</code>.
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* @serial
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* @see #clone()
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*/
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public int fill;
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|
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/**
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* This field specifies the external padding of the component, the
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* minimum amount of space between the component and the edges of its
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* display area.
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* <p>
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* The default value is <code>new Insets(0, 0, 0, 0)</code>.
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* @serial
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* @see #clone()
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*/
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public Insets insets;
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|
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/**
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* This field specifies the internal padding of the component, how much
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* space to add to the minimum width of the component. The width of
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* the component is at least its minimum width plus
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* <code>ipadx</code> pixels.
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* <p>
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* The default value is <code>0</code>.
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* @serial
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* @see #clone()
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* @see java.awt.GridBagConstraints#ipady
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*/
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public int ipadx;
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|
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/**
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|
* This field specifies the internal padding, that is, how much
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* space to add to the minimum height of the component. The height of
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* the component is at least its minimum height plus
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* <code>ipady</code> pixels.
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|
* <p>
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* The default value is 0.
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* @serial
|
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* @see #clone()
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* @see java.awt.GridBagConstraints#ipadx
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*/
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public int ipady;
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|
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/**
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|
* Temporary place holder for the x coordinate.
|
|
* @serial
|
|
*/
|
|
int tempX;
|
|
/**
|
|
* Temporary place holder for the y coordinate.
|
|
* @serial
|
|
*/
|
|
int tempY;
|
|
/**
|
|
* Temporary place holder for the Width of the component.
|
|
* @serial
|
|
*/
|
|
int tempWidth;
|
|
/**
|
|
* Temporary place holder for the Height of the component.
|
|
* @serial
|
|
*/
|
|
int tempHeight;
|
|
/**
|
|
* The minimum width of the component. It is used to calculate
|
|
* <code>ipady</code>, where the default will be 0.
|
|
* @serial
|
|
* @see #ipady
|
|
*/
|
|
int minWidth;
|
|
/**
|
|
* The minimum height of the component. It is used to calculate
|
|
* <code>ipadx</code>, where the default will be 0.
|
|
* @serial
|
|
* @see #ipadx
|
|
*/
|
|
int minHeight;
|
|
|
|
// The following fields are only used if the anchor is
|
|
// one of BASELINE, BASELINE_LEADING or BASELINE_TRAILING.
|
|
// ascent and descent include the insets and ipady values.
|
|
transient int ascent;
|
|
transient int descent;
|
|
transient Component.BaselineResizeBehavior baselineResizeBehavior;
|
|
// The folllowing two fields are used if the baseline type is
|
|
// CENTER_OFFSET.
|
|
// centerPadding is either 0 or 1 and indicates if
|
|
// the height needs to be padded by one when calculating where the
|
|
// baseline lands
|
|
transient int centerPadding;
|
|
// Where the baseline lands relative to the center of the component.
|
|
transient int centerOffset;
|
|
|
|
/*
|
|
* JDK 1.1 serialVersionUID
|
|
*/
|
|
private static final long serialVersionUID = -1000070633030801713L;
|
|
|
|
/**
|
|
* Creates a <code>GridBagConstraint</code> object with
|
|
* all of its fields set to their default value.
|
|
*/
|
|
public GridBagConstraints () {
|
|
gridx = RELATIVE;
|
|
gridy = RELATIVE;
|
|
gridwidth = 1;
|
|
gridheight = 1;
|
|
|
|
weightx = 0;
|
|
weighty = 0;
|
|
anchor = CENTER;
|
|
fill = NONE;
|
|
|
|
insets = new Insets(0, 0, 0, 0);
|
|
ipadx = 0;
|
|
ipady = 0;
|
|
}
|
|
|
|
/**
|
|
* Creates a <code>GridBagConstraints</code> object with
|
|
* all of its fields set to the passed-in arguments.
|
|
*
|
|
* Note: Because the use of this constructor hinders readability
|
|
* of source code, this constructor should only be used by
|
|
* automatic source code generation tools.
|
|
*
|
|
* @param gridx The initial gridx value.
|
|
* @param gridy The initial gridy value.
|
|
* @param gridwidth The initial gridwidth value.
|
|
* @param gridheight The initial gridheight value.
|
|
* @param weightx The initial weightx value.
|
|
* @param weighty The initial weighty value.
|
|
* @param anchor The initial anchor value.
|
|
* @param fill The initial fill value.
|
|
* @param insets The initial insets value.
|
|
* @param ipadx The initial ipadx value.
|
|
* @param ipady The initial ipady value.
|
|
*
|
|
* @see java.awt.GridBagConstraints#gridx
|
|
* @see java.awt.GridBagConstraints#gridy
|
|
* @see java.awt.GridBagConstraints#gridwidth
|
|
* @see java.awt.GridBagConstraints#gridheight
|
|
* @see java.awt.GridBagConstraints#weightx
|
|
* @see java.awt.GridBagConstraints#weighty
|
|
* @see java.awt.GridBagConstraints#anchor
|
|
* @see java.awt.GridBagConstraints#fill
|
|
* @see java.awt.GridBagConstraints#insets
|
|
* @see java.awt.GridBagConstraints#ipadx
|
|
* @see java.awt.GridBagConstraints#ipady
|
|
*
|
|
* @since 1.2
|
|
*/
|
|
public GridBagConstraints(int gridx, int gridy,
|
|
int gridwidth, int gridheight,
|
|
double weightx, double weighty,
|
|
int anchor, int fill,
|
|
Insets insets, int ipadx, int ipady) {
|
|
this.gridx = gridx;
|
|
this.gridy = gridy;
|
|
this.gridwidth = gridwidth;
|
|
this.gridheight = gridheight;
|
|
this.fill = fill;
|
|
this.ipadx = ipadx;
|
|
this.ipady = ipady;
|
|
this.insets = insets;
|
|
this.anchor = anchor;
|
|
this.weightx = weightx;
|
|
this.weighty = weighty;
|
|
}
|
|
|
|
/**
|
|
* Creates a copy of this grid bag constraint.
|
|
* @return a copy of this grid bag constraint
|
|
*/
|
|
public Object clone () {
|
|
try {
|
|
GridBagConstraints c = (GridBagConstraints)super.clone();
|
|
c.insets = (Insets)insets.clone();
|
|
return c;
|
|
} catch (CloneNotSupportedException e) {
|
|
// this shouldn't happen, since we are Cloneable
|
|
throw new InternalError(e);
|
|
}
|
|
}
|
|
|
|
boolean isVerticallyResizable() {
|
|
return (fill == BOTH || fill == VERTICAL);
|
|
}
|
|
}
|