GridBagLayout.java revision 2362
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* 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.
*/
/**
* The <code>GridBagLayout</code> class is a flexible layout
* manager that aligns components vertically, horizontally or along their
* baseline without requiring that the components be of the same size.
* Each <code>GridBagLayout</code> object maintains a dynamic,
* rectangular grid of cells, with each component occupying
* one or more cells, called its <em>display area</em>.
* <p>
* Each component managed by a <code>GridBagLayout</code> is associated with
* an instance of {@link GridBagConstraints}. The constraints object
* specifies where a component's display area should be located on the grid
* and how the component should be positioned within its display area. In
* addition to its constraints object, the <code>GridBagLayout</code> also
* considers each component's minimum and preferred sizes in order to
* determine a component's size.
* <p>
* The overall orientation of the grid depends on the container's
* {@link ComponentOrientation} property. For horizontal left-to-right
* orientations, grid coordinate (0,0) is in the upper left corner of the
* container with x increasing to the right and y increasing downward. For
* horizontal right-to-left orientations, grid coordinate (0,0) is in the upper
* right corner of the container with x increasing to the left and y
* increasing downward.
* <p>
* To use a grid bag layout effectively, you must customize one or more
* of the <code>GridBagConstraints</code> objects that are associated
* with its components. You customize a <code>GridBagConstraints</code>
* object by setting one or more of its instance variables:
* <p>
* <dl>
* <dt>{@link GridBagConstraints#gridx},
* {@link GridBagConstraints#gridy}
* <dd>Specifies the cell containing the leading corner of the component's
* display area, where the cell at the origin of the grid has address
* <code>gridx = 0</code>,
* <code>gridy = 0</code>. For horizontal left-to-right layout,
* a component's leading corner is its upper left. For horizontal
* right-to-left layout, a component's leading corner is its upper right.
* Use <code>GridBagConstraints.RELATIVE</code> (the default value)
* to specify that the component be placed immediately following
* (along the x axis for <code>gridx</code> or the y axis for
* <code>gridy</code>) the component that was added to the container
* just before this component was added.
* <dt>{@link GridBagConstraints#gridwidth},
* {@link GridBagConstraints#gridheight}
* <dd>Specifies the number of cells in a row (for <code>gridwidth</code>)
* or column (for <code>gridheight</code>)
* in the component's display area.
* The default value is 1.
* Use <code>GridBagConstraints.REMAINDER</code> to specify
* that the component's display area will be from <code>gridx</code>
* to the last cell in the row (for <code>gridwidth</code>)
* or from <code>gridy</code> to the last cell in the column
* (for <code>gridheight</code>).
*
* Use <code>GridBagConstraints.RELATIVE</code> to specify
* that the component's display area will be from <code>gridx</code>
* to the next to the last cell in its row (for <code>gridwidth</code>
* or from <code>gridy</code> to the next to the last cell in its
* column (for <code>gridheight</code>).
*
* <dt>{@link GridBagConstraints#fill}
* <dd>Used when the component's display area
* is larger than the component's requested size
* to determine whether (and how) to resize the component.
* Possible values are
* <code>GridBagConstraints.NONE</code> (the default),
* <code>GridBagConstraints.HORIZONTAL</code>
* (make the component wide enough to fill its display area
* horizontally, but don't change its height),
* <code>GridBagConstraints.VERTICAL</code>
* (make the component tall enough to fill its display area
* vertically, but don't change its width), and
* <code>GridBagConstraints.BOTH</code>
* (make the component fill its display area entirely).
* <dt>{@link GridBagConstraints#ipadx},
* {@link GridBagConstraints#ipady}
* <dd>Specifies the component's internal padding within the layout,
* how much to add to the minimum size of the component.
* The width of the component will be at least its minimum width
* plus <code>ipadx</code> pixels. Similarly, the height of
* the component will be at least the minimum height plus
* <code>ipady</code> pixels.
* <dt>{@link GridBagConstraints#insets}
* <dd>Specifies the component's external padding, the minimum
* amount of space between the component and the edges of its display area.
* <dt>{@link GridBagConstraints#anchor}
* <dd>Specifies where the component should be positioned in its display area.
* There are three kinds of possible values: absolute, orientation-relative,
* and baseline-relative
* Orientation relative values are interpreted relative to the container's
* <code>ComponentOrientation</code> property while absolute values
* are not. Baseline relative values are calculated relative to the
* baseline. Valid values are:</dd>
* <p>
* <center><table BORDER=0 COLS=3 WIDTH=800
* SUMMARY="absolute, relative and baseline values as described above">
* <tr>
* <th><P ALIGN="LEFT">Absolute Values</th>
* <th><P ALIGN="LEFT">Orientation Relative Values</th>
* <th><P ALIGN="LEFT">Baseline Relative Values</th>
* </tr>
* <tr>
* <td>
* <li><code>GridBagConstraints.NORTH</code></li>
* <li><code>GridBagConstraints.SOUTH</code></li>
* <li><code>GridBagConstraints.WEST</code></li>
* <li><code>GridBagConstraints.EAST</code></li>
* <li><code>GridBagConstraints.NORTHWEST</code></li>
* <li><code>GridBagConstraints.NORTHEAST</code></li>
* <li><code>GridBagConstraints.SOUTHWEST</code></li>
* <li><code>GridBagConstraints.SOUTHEAST</code></li>
* <li><code>GridBagConstraints.CENTER</code> (the default)</li>
* </td>
* <td>
* <li><code>GridBagConstraints.PAGE_START</code></li>
* <li><code>GridBagConstraints.PAGE_END</code></li>
* <li><code>GridBagConstraints.LINE_START</code></li>
* <li><code>GridBagConstraints.LINE_END</code></li>
* <li><code>GridBagConstraints.FIRST_LINE_START</code></li>
* <li><code>GridBagConstraints.FIRST_LINE_END</code></li>
* <li><code>GridBagConstraints.LAST_LINE_START</code></li>
* <li><code>GridBagConstraints.LAST_LINE_END</code></li>
* </td>
* <td>
* <li><code>GridBagConstraints.BASELINE</code></li>
* <li><code>GridBagConstraints.BASELINE_LEADING</code></li>
* <li><code>GridBagConstraints.BASELINE_TRAILING</code></li>
* <li><code>GridBagConstraints.ABOVE_BASELINE</code></li>
* <li><code>GridBagConstraints.ABOVE_BASELINE_LEADING</code></li>
* <li><code>GridBagConstraints.ABOVE_BASELINE_TRAILING</code></li>
* <li><code>GridBagConstraints.BELOW_BASELINE</code></li>
* <li><code>GridBagConstraints.BELOW_BASELINE_LEADING</code></li>
* <li><code>GridBagConstraints.BELOW_BASELINE_TRAILING</code></li>
* </td>
* </tr>
* </table></center><p>
* <dt>{@link GridBagConstraints#weightx},
* {@link GridBagConstraints#weighty}
* <dd>Used to determine how to distribute space, which is
* important for specifying resizing behavior.
* Unless you specify a weight for at least one component
* in a row (<code>weightx</code>) and column (<code>weighty</code>),
* all the components clump together in the center of their container.
* This is because when the weight is zero (the default),
* the <code>GridBagLayout</code> object puts any extra space
* between its grid of cells and the edges of the container.
* </dl>
* <p>
* Each row may have a baseline; the baseline is determined by the
* components in that row that have a valid baseline and are aligned
* along the baseline (the component's anchor value is one of {@code
* BASELINE}, {@code BASELINE_LEADING} or {@code BASELINE_TRAILING}).
* If none of the components in the row has a valid baseline, the row
* does not have a baseline.
* <p>
* If a component spans rows it is aligned either to the baseline of
* the start row (if the baseline-resize behavior is {@code
* CONSTANT_ASCENT}) or the end row (if the baseline-resize behavior
* is {@code CONSTANT_DESCENT}). The row that the component is
* aligned to is called the <em>prevailing row</em>.
* <p>
* The following figure shows a baseline layout and includes a
* component that spans rows:
* <center><table summary="Baseline Layout">
* <tr ALIGN=CENTER>
* <td>
* <img src="doc-files/GridBagLayout-baseline.png"
* alt="The following text describes this graphic (Figure 1)." ALIGN=center>
* </td>
* </table></center>
* This layout consists of three components:
* <ul><li>A panel that starts in row 0 and ends in row 1. The panel
* has a baseline-resize behavior of <code>CONSTANT_DESCENT</code> and has
* an anchor of <code>BASELINE</code>. As the baseline-resize behavior
* is <code>CONSTANT_DESCENT</code> the prevailing row for the panel is
* row 1.
* <li>Two buttons, each with a baseline-resize behavior of
* <code>CENTER_OFFSET</code> and an anchor of <code>BASELINE</code>.
* </ul>
* Because the second button and the panel share the same prevailing row,
* they are both aligned along their baseline.
* <p>
* Components positioned using one of the baseline-relative values resize
* differently than when positioned using an absolute or orientation-relative
* value. How components change is dictated by how the baseline of the
* prevailing row changes. The baseline is anchored to the
* bottom of the display area if any components with the same prevailing row
* have a baseline-resize behavior of <code>CONSTANT_DESCENT</code>,
* otherwise the baseline is anchored to the top of the display area.
* The following rules dictate the resize behavior:
* <ul>
* <li>Resizable components positioned above the baseline can only
* grow as tall as the baseline. For example, if the baseline is at 100
* and anchored at the top, a resizable component positioned above the
* baseline can never grow more than 100 units.
* <li>Similarly, resizable components positioned below the baseline can
* only grow as high as the difference between the display height and the
* baseline.
* <li>Resizable components positioned on the baseline with a
* baseline-resize behavior of <code>OTHER</code> are only resized if
* the baseline at the resized size fits within the display area. If
* the baseline is such that it does not fit within the display area
* the component is not resized.
* <li>Components positioned on the baseline that do not have a
* baseline-resize behavior of <code>OTHER</code>
* can only grow as tall as {@code display height - baseline + baseline of component}.
* </ul>
* If you position a component along the baseline, but the
* component does not have a valid baseline, it will be vertically centered
* in its space. Similarly if you have positioned a component relative
* to the baseline and none of the components in the row have a valid
* baseline the component is vertically centered.
* <p>
* The following figures show ten components (all buttons)
* managed by a grid bag layout. Figure 2 shows the layout for a horizontal,
* left-to-right container and Figure 3 shows the layout for a horizontal,
* right-to-left container.
* <p>
* <center><table COLS=2 WIDTH=600 summary="layout">
* <tr ALIGN=CENTER>
* <td>
* <img src="doc-files/GridBagLayout-1.gif" alt="The preceeding text describes this graphic (Figure 1)." ALIGN=center HSPACE=10 VSPACE=7>
* </td>
* <td>
* <img src="doc-files/GridBagLayout-2.gif" alt="The preceeding text describes this graphic (Figure 2)." ALIGN=center HSPACE=10 VSPACE=7>
* </td>
* <tr ALIGN=CENTER>
* <td>Figure 2: Horizontal, Left-to-Right</td>
* <td>Figure 3: Horizontal, Right-to-Left</td>
* </tr>
* </table></center>
* <p>
* Each of the ten components has the <code>fill</code> field
* of its associated <code>GridBagConstraints</code> object
* set to <code>GridBagConstraints.BOTH</code>.
* In addition, the components have the following non-default constraints:
* <p>
* <ul>
* <li>Button1, Button2, Button3: <code>weightx = 1.0</code>
* <li>Button4: <code>weightx = 1.0</code>,
* <code>gridwidth = GridBagConstraints.REMAINDER</code>
* <li>Button5: <code>gridwidth = GridBagConstraints.REMAINDER</code>
* <li>Button6: <code>gridwidth = GridBagConstraints.RELATIVE</code>
* <li>Button7: <code>gridwidth = GridBagConstraints.REMAINDER</code>
* <li>Button8: <code>gridheight = 2</code>,
* <code>weighty = 1.0</code>
* <li>Button9, Button 10:
* <code>gridwidth = GridBagConstraints.REMAINDER</code>
* </ul>
* <p>
* Here is the code that implements the example shown above:
* <p>
* <hr><blockquote><pre>
* import java.awt.*;
* import java.util.*;
* import java.applet.Applet;
*
* public class GridBagEx1 extends Applet {
*
* protected void makebutton(String name,
* GridBagLayout gridbag,
* GridBagConstraints c) {
* Button button = new Button(name);
* gridbag.setConstraints(button, c);
* add(button);
* }
*
* public void init() {
* GridBagLayout gridbag = new GridBagLayout();
* GridBagConstraints c = new GridBagConstraints();
*
* setFont(new Font("SansSerif", Font.PLAIN, 14));
* setLayout(gridbag);
*
* c.fill = GridBagConstraints.BOTH;
* c.weightx = 1.0;
* makebutton("Button1", gridbag, c);
* makebutton("Button2", gridbag, c);
* makebutton("Button3", gridbag, c);
*
* c.gridwidth = GridBagConstraints.REMAINDER; //end row
* makebutton("Button4", gridbag, c);
*
* c.weightx = 0.0; //reset to the default
* makebutton("Button5", gridbag, c); //another row
*
* c.gridwidth = GridBagConstraints.RELATIVE; //next-to-last in row
* makebutton("Button6", gridbag, c);
*
* c.gridwidth = GridBagConstraints.REMAINDER; //end row
* makebutton("Button7", gridbag, c);
*
* c.gridwidth = 1; //reset to the default
* c.gridheight = 2;
* c.weighty = 1.0;
* makebutton("Button8", gridbag, c);
*
* c.weighty = 0.0; //reset to the default
* c.gridwidth = GridBagConstraints.REMAINDER; //end row
* c.gridheight = 1; //reset to the default
* makebutton("Button9", gridbag, c);
* makebutton("Button10", gridbag, c);
*
* setSize(300, 100);
* }
*
* public static void main(String args[]) {
* Frame f = new Frame("GridBag Layout Example");
* GridBagEx1 ex1 = new GridBagEx1();
*
* ex1.init();
*
* f.add("Center", ex1);
* f.pack();
* f.setSize(f.getPreferredSize());
* f.show();
* }
* }
* </pre></blockquote><hr>
* <p>
* @author Doug Stein
* @author Bill Spitzak (orignial NeWS & OLIT implementation)
* @see java.awt.GridBagConstraints
* @see java.awt.GridBagLayoutInfo
* @see java.awt.ComponentOrientation
* @since JDK1.0
*/
public class GridBagLayout implements LayoutManager2,
static final int EMPIRICMULTIPLIER = 2;
/**
* This field is no longer used to reserve arrays and keeped for backward
* compatibility. Previously, this was
* the maximum number of grid positions (both horizontal and
* vertical) that could be laid out by the grid bag layout.
* Current implementation doesn't impose any limits
* on the size of a grid.
*/
protected static final int MAXGRIDSIZE = 512;
/**
* The smallest grid that can be laid out by the grid bag layout.
*/
protected static final int MINSIZE = 1;
/**
* The preferred grid size that can be laid out by the grid bag layout.
*/
protected static final int PREFERREDSIZE = 2;
/**
* This hashtable maintains the association between
* a component and its gridbag constraints.
* The Keys in <code>comptable</code> are the components and the
* values are the instances of <code>GridBagConstraints</code>.
*
* @serial
* @see java.awt.GridBagConstraints
*/
/**
* This field holds a gridbag constraints instance
* containing the default values, so if a component
* does not have gridbag constraints associated with
* it, then the component will be assigned a
* copy of the <code>defaultConstraints</code>.
*
* @serial
* @see #getConstraints(Component)
* @see #setConstraints(Component, GridBagConstraints)
* @see #lookupConstraints(Component)
*/
protected GridBagConstraints defaultConstraints;
/**
* This field holds the layout information
* for the gridbag. The information in this field
* is based on the most recent validation of the
* gridbag.
* If <code>layoutInfo</code> is <code>null</code>
* this indicates that there are no components in
* the gridbag or if there are components, they have
* not yet been validated.
*
* @serial
* @see #getLayoutInfo(Container, int)
*/
protected GridBagLayoutInfo layoutInfo;
/**
* This field holds the overrides to the column minimum
* width. If this field is non-<code>null</code> the values are
* applied to the gridbag after all of the minimum columns
* widths have been calculated.
* If columnWidths has more elements than the number of
* columns, columns are added to the gridbag to match
* the number of elements in columnWidth.
*
* @serial
* @see #getLayoutDimensions()
*/
public int columnWidths[];
/**
* This field holds the overrides to the row minimum
* heights. If this field is non-<code>null</code> the values are
* applied to the gridbag after all of the minimum row
* heights have been calculated.
* If <code>rowHeights</code> has more elements than the number of
* rows, rowa are added to the gridbag to match
* the number of elements in <code>rowHeights</code>.
*
* @serial
* @see #getLayoutDimensions()
*/
public int rowHeights[];
/**
* This field holds the overrides to the column weights.
* If this field is non-<code>null</code> the values are
* applied to the gridbag after all of the columns
* weights have been calculated.
* If <code>columnWeights[i]</code> > weight for column i, then
* column i is assigned the weight in <code>columnWeights[i]</code>.
* If <code>columnWeights</code> has more elements than the number
* of columns, the excess elements are ignored - they do
* not cause more columns to be created.
*
* @serial
*/
public double columnWeights[];
/**
* This field holds the overrides to the row weights.
* If this field is non-<code>null</code> the values are
* applied to the gridbag after all of the rows
* weights have been calculated.
* If <code>rowWeights[i]</code> > weight for row i, then
* row i is assigned the weight in <code>rowWeights[i]</code>.
* If <code>rowWeights</code> has more elements than the number
* of rows, the excess elements are ignored - they do
* not cause more rows to be created.
*
* @serial
*/
public double rowWeights[];
/**
* The component being positioned. This is set before calling into
* <code>adjustForGravity</code>.
*/
private Component componentAdjusting;
/**
* Creates a grid bag layout manager.
*/
public GridBagLayout () {
defaultConstraints = new GridBagConstraints();
}
/**
* Sets the constraints for the specified component in this layout.
* @param comp the component to be modified
* @param constraints the constraints to be applied
*/
}
/**
* Gets the constraints for the specified component. A copy of
* the actual <code>GridBagConstraints</code> object is returned.
* @param comp the component to be queried
* @return the constraint for the specified component in this
* grid bag layout; a copy of the actual constraint
* object is returned
*/
if (constraints == null) {
}
}
/**
* Retrieves the constraints for the specified component.
* The return value is not a copy, but is the actual
* <code>GridBagConstraints</code> object used by the layout mechanism.
* <p>
* If <code>comp</code> is not in the <code>GridBagLayout</code>,
* a set of default <code>GridBagConstraints</code> are returned.
* A <code>comp</code> value of <code>null</code> is invalid
* and returns <code>null</code>.
*
* @param comp the component to be queried
* @return the contraints for the specified component
*/
if (constraints == null) {
}
return constraints;
}
/**
* Removes the constraints for the specified component in this layout
* @param comp the component to be modified
*/
}
/**
* Determines the origin of the layout area, in the graphics coordinate
* space of the target container. This value represents the pixel
* coordinates of the top-left corner of the layout area regardless of
* the <code>ComponentOrientation</code> value of the container. This
* is distinct from the grid origin given by the cell coordinates (0,0).
* Most applications do not call this method directly.
* @return the graphics origin of the cell in the top-left
* corner of the layout grid
* @see java.awt.ComponentOrientation
* @since JDK1.1
*/
public Point getLayoutOrigin () {
if (layoutInfo != null) {
}
return origin;
}
/**
* Determines column widths and row heights for the layout grid.
* <p>
* Most applications do not call this method directly.
* @return an array of two arrays, containing the widths
* of the layout columns and
* the heights of the layout rows
* @since JDK1.1
*/
public int [][] getLayoutDimensions () {
if (layoutInfo == null)
return new int[2][0];
int dim[][] = new int [2][];
return dim;
}
/**
* Determines the weights of the layout grid's columns and rows.
* Weights are used to calculate how much a given column or row
* stretches beyond its preferred size, if the layout has extra
* room to fill.
* <p>
* Most applications do not call this method directly.
* @return an array of two arrays, representing the
* horizontal weights of the layout columns
* and the vertical weights of the layout rows
* @since JDK1.1
*/
public double [][] getLayoutWeights () {
if (layoutInfo == null)
return new double[2][0];
double weights[][] = new double [2][];
return weights;
}
/**
* Determines which cell in the layout grid contains the point
* specified by <code>(x, y)</code>. Each cell is identified
* by its column index (ranging from 0 to the number of columns
* minus 1) and its row index (ranging from 0 to the number of
* rows minus 1).
* <p>
* If the <code>(x, y)</code> point lies
* outside the grid, the following rules are used.
* The column index is returned as zero if <code>x</code> lies to the
* left of the layout for a left-to-right container or to the right of
* the layout for a right-to-left container. The column index is returned
* as the number of columns if <code>x</code> lies
* to the right of the layout in a left-to-right container or to the left
* in a right-to-left container.
* The row index is returned as zero if <code>y</code> lies above the
* layout, and as the number of rows if <code>y</code> lies
* below the layout. The orientation of a container is determined by its
* <code>ComponentOrientation</code> property.
* @param x the <i>x</i> coordinate of a point
* @param y the <i>y</i> coordinate of a point
* @return an ordered pair of indexes that indicate which cell
* in the layout grid contains the point
* (<i>x</i>, <i>y</i>).
* @see java.awt.ComponentOrientation
* @since JDK1.1
*/
int i, d;
if (layoutInfo == null)
return loc;
d = layoutInfo.startx;
if (!rightToLeft) {
d += layoutInfo.minWidth[i];
if (d > x)
break;
}
} else {
if (d > x)
break;
d += layoutInfo.minWidth[i];
}
i++;
}
loc.x = i;
d = layoutInfo.starty;
d += layoutInfo.minHeight[i];
if (d > y)
break;
}
loc.y = i;
return loc;
}
/**
* Has no effect, since this layout manager does not use a per-component string.
*/
}
/**
* Adds the specified component to the layout, using the specified
* <code>constraints</code> object. Note that constraints
* are mutable and are, therefore, cloned when cached.
*
* @param comp the component to be added
* @param constraints an object that determines how
* the component is added to the layout
* @exception IllegalArgumentException if <code>constraints</code>
* is not a <code>GridBagConstraint</code>
*/
if (constraints instanceof GridBagConstraints) {
} else if (constraints != null) {
throw new IllegalArgumentException("cannot add to layout: constraints must be a GridBagConstraint");
}
}
/**
* Removes the specified component from this layout.
* <p>
* 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()
*/
}
/**
* Determines the preferred size of the <code>parent</code>
* container using this grid bag layout.
* <p>
* Most applications do not call this method directly.
*
* @param parent the container in which to do the layout
* @see java.awt.Container#getPreferredSize
* @return the preferred size of the <code>parent</code>
* container
*/
}
/**
* Determines the minimum size of the <code>parent</code> container
* using this grid bag layout.
* <p>
* Most applications do not call this method directly.
* @param parent the container in which to do the layout
* @see java.awt.Container#doLayout
* @return the minimum size of the <code>parent</code> container
*/
}
/**
* Returns the maximum dimensions for this layout given the components
* in the specified target container.
* @param target the container which needs to be laid out
* @see Container
* @see #minimumLayoutSize(Container)
* @see #preferredLayoutSize(Container)
* @return the maximum dimensions for this layout
*/
}
/**
* 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.
* <p>
* @return the value <code>0.5f</code> to indicate centered
*/
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.
* <p>
* @return the value <code>0.5f</code> to indicate centered
*/
return 0.5f;
}
/**
* Invalidates the layout, indicating that if the layout manager
* has cached information it should be discarded.
*/
}
/**
* Lays out the specified container using this grid bag layout.
* This method reshapes components in the specified container in
* order to satisfy the contraints of this <code>GridBagLayout</code>
* object.
* <p>
* Most applications do not call this method directly.
* @param parent the container in which to do the layout
* @see java.awt.Container
* @see java.awt.Container#doLayout
*/
}
/**
* Returns a string representation of this grid bag layout's values.
* @return a string representation of this grid bag layout.
*/
}
/**
* Print the layout information. Useful for debugging.
*/
/* DEBUG
*
* protected void dumpLayoutInfo(GridBagLayoutInfo s) {
* int x;
*
* System.out.println("Col\tWidth\tWeight");
* for (x=0; x<s.width; x++) {
* System.out.println(x + "\t" +
* s.minWidth[x] + "\t" +
* s.weightX[x]);
* }
* System.out.println("Row\tHeight\tWeight");
* for (x=0; x<s.height; x++) {
* System.out.println(x + "\t" +
* s.minHeight[x] + "\t" +
* s.weightY[x]);
* }
* }
*/
/**
* Print the layout constraints. Useful for debugging.
*/
/* DEBUG
*
* protected void dumpConstraints(GridBagConstraints constraints) {
* System.out.println(
* "wt " +
* constraints.weightx +
* " " +
* constraints.weighty +
* ", " +
*
* "box " +
* constraints.gridx +
* " " +
* constraints.gridy +
* " " +
* constraints.gridwidth +
* " " +
* constraints.gridheight +
* ", " +
*
* "min " +
* constraints.minWidth +
* " " +
* constraints.minHeight +
* ", " +
*
* "pad " +
* constraints.insets.bottom +
* " " +
* constraints.insets.left +
* " " +
* constraints.insets.right +
* " " +
* constraints.insets.top +
* " " +
* constraints.ipadx +
* " " +
* constraints.ipady);
* }
*/
/**
* Fills in an instance of <code>GridBagLayoutInfo</code> for the
* current set of managed children. This requires three passes through the
* set of children:
*
* <ol>
* <li>Figure out the dimensions of the layout grid.
* <li>Determine which cells the components occupy.
* </ol>
*
* This also caches the minsizes for all the children when they are
* first encountered (so subsequent loops don't need to ask again).
* <p>
* This method should only be used internally by
* <code>GridBagLayout</code>.
*
* @param parent the layout container
* @param sizeflag either <code>PREFERREDSIZE</code> or
* <code>MINSIZE</code>
* @return the <code>GridBagLayoutInfo</code> for the set of children
* @since 1.4
*/
}
/*
* Calculate maximum array sizes to allocate arrays without ensureCapacity
* we may use preCalculated sizes in whole class because of upper estimation of
* maximumArrayXIndex and maximumArrayYIndex.
*/
int preMaximumArrayXIndex = 0;
int preMaximumArrayYIndex = 0;
long [] returnArray = new long[2];
continue;
}
// -1==RELATIVE, means that column|row equals to previously added component,
// since each next Component with gridx|gridy == RELATIVE starts from
// previous position, so we should start from previous component which
// already used in maximumArray[X|Y]Index calculation. We could just increase
// maximum by 1 to handle situation when component with gridx=-1 was added.
if (curX < 0){
}
if (curY < 0){
}
// gridwidth|gridheight may be equal to RELATIVE (-1) or REMAINDER (0)
// in any case using 1 instead of 0 or -1 should be sufficient to for
// correct maximumArraySizes calculation
if (curWidth <= 0){
curWidth = 1;
}
if (curHeight <= 0){
curHeight = 1;
}
} //for (components) loop
// Must specify index++ to allocate well-working arrays.
/* fix for 4623196.
* now return long array instead of Point
*/
return returnArray;
} //PreInitMaximumSizes
/**
* This method is obsolete and supplied for backwards
* compatability only; new code should call {@link
* #getLayoutInfo(java.awt.Container, int) getLayoutInfo} instead.
* This method is the same as <code>getLayoutInfo</code>;
* refer to <code>getLayoutInfo</code> for details on parameters
* and return value.
*/
synchronized (parent.getTreeLock()) {
Dimension d;
// Code below will address index curX+curWidth in the case of yMaxArray, weightY
// ( respectively curY+curHeight for xMaxArray, weightX ) where
// curX in 0 to preInitMaximumArraySizes.y
// Thus, the maximum index that could
// be calculated in the following code is curX+curX.
// EmpericMultier equals 2 because of this.
int layoutWidth, layoutHeight;
int []xMaxArray;
int []yMaxArray;
double weight_diff, weight;
int maximumArrayXIndex = 0;
int maximumArrayYIndex = 0;
int anchor;
/*
* Pass #1
*
* Figure out the dimensions of the layout grid (use a value of 1 for
* zero or negative widths and heights).
*/
/* fix for 4623196.
* If user try to create a very big grid we can
* get NegativeArraySizeException because of integer value
* overflow (EMPIRICMULTIPLIER*gridSize might be more then Integer.MAX_VALUE).
* We need to detect this situation and try to create a
* grid with Integer.MAX_VALUE size instead.
*/
maximumArrayXIndex = (EMPIRICMULTIPLIER * arraySizes[0] > Integer.MAX_VALUE )? Integer.MAX_VALUE : EMPIRICMULTIPLIER*(int)arraySizes[0];
maximumArrayYIndex = (EMPIRICMULTIPLIER * arraySizes[1] > Integer.MAX_VALUE )? Integer.MAX_VALUE : EMPIRICMULTIPLIER*(int)arraySizes[1];
if (rowHeights != null){
}
if (columnWidths != null){
}
xMaxArray = new int[maximumArrayXIndex];
yMaxArray = new int[maximumArrayYIndex];
boolean hasBaseline = false;
continue;
if (curWidth <= 0)
curWidth = 1;
if (curHeight <= 0)
curHeight = 1;
/* If x or y is negative, then use relative positioning: */
if (curRow >= 0)
else if (curCol >= 0)
else
curY = 0;
}
if (curX < 0) {
px = 0;
}
if(curX < 0)
curX = 0;
}
else if (curY < 0) {
py = 0;
}
if(curY < 0)
curY = 0;
}
/* Adjust the grid width and height
* fix for 5005945: unneccessary loops removed
*/
if (layoutWidth < px) {
layoutWidth = px;
}
if (layoutHeight < py) {
layoutHeight = py;
}
/* Adjust xMaxArray and yMaxArray */
}
}
/* Cache the current slave's size. */
if (sizeflag == PREFERREDSIZE)
d = comp.getPreferredSize();
else
d = comp.getMinimumSize();
hasBaseline = true;
}
/* Zero width and height must mean that this is the last item (or
* else something is wrong). */
/* Zero width starts a new row */
/* Zero height starts a new column */
} //for (components) loop
/*
*/
/*
* Pass #2
*
* Negative values for gridX are filled in with the current x value.
* Negative values for gridY are filled in with the current y value.
* Negative or zero values for gridWidth and gridHeight end the current
* row or column, respectively.
*/
int[] maxDescent = null;
short[] baselineType = null;
if (hasBaseline) {
r.hasBaseline = true;
}
continue;
/* If x or y is negative, then use relative positioning: */
if(curRow >= 0)
else if(curCol >= 0)
else
curY = 0;
}
if (curX < 0) {
if (curHeight <= 0) {
if (curHeight < 1)
curHeight = 1;
}
px = 0;
if(curX < 0)
curX = 0;
}
else if (curY < 0) {
if (curWidth <= 0) {
if (curWidth < 1)
curWidth = 1;
}
py = 0;
}
if(curY < 0)
curY = 0;
}
if (curWidth <= 0) {
if (curWidth < 1)
curWidth = 1;
}
if (curHeight <= 0) {
if (curHeight < 1)
curHeight = 1;
}
/* Assign the new values to the gridbag slave */
if (hasBaseline) {
switch(anchor) {
case GridBagConstraints.BASELINE:
if (curHeight == 1) {
maxDescent[curY] =
}
else {
- 1],
}
else {
}
}
(1 << constraints.
}
else {
}
}
break;
// Component positioned above the baseline.
// To make the bottom edge of the component aligned
// with the baseline the bottom inset is
// added to the descent, the rest to the ascent.
break;
// Component positioned below the baseline.
// To make the top edge of the component aligned
// with the baseline the top inset is
// added to the ascent, the rest to the descent.
break;
}
}
}
r.weightX = new double[maximumArrayYIndex];
r.weightY = new double[maximumArrayXIndex];
r.minWidth = new int[maximumArrayYIndex];
r.minHeight = new int[maximumArrayXIndex];
/*
*/
if (columnWidths != null)
if (rowHeights != null)
if (columnWeights != null)
if (rowWeights != null)
/*
* Pass #3
*
* Distribute the minimun widths and weights:
*/
for (i = 1;
continue;
if (constraints.tempWidth == i) {
/*
* Figure out if we should use this slave\'s weight. If the weight
* is less than the total weight spanned by the width of the cell,
* then discard the weight. Otherwise split the difference
* according to the existing weights.
*/
weight_diff -= r.weightX[k];
if (weight_diff > 0.0) {
weight = 0.0;
weight_diff -= dx;
}
/* Assign the remainder to the rightmost cell */
}
/*
* Calculate the minWidth array values.
* First, figure out how wide the current slave needs to be.
* Then, see if it will fit within the current minWidth values.
* If it will not fit, add the difference according to the
* weightX array.
*/
pixels_diff -= r.minWidth[k];
if (pixels_diff > 0) {
weight = 0.0;
pixels_diff -= dx;
}
/* Any leftovers go into the rightmost cell */
}
}
if (constraints.tempHeight == i) {
/*
* Figure out if we should use this slave's weight. If the weight
* is less than the total weight spanned by the height of the cell,
* then discard the weight. Otherwise split it the difference
* according to the existing weights.
*/
weight_diff -= r.weightY[k];
if (weight_diff > 0.0) {
weight = 0.0;
weight_diff -= dy;
}
/* Assign the remainder to the bottom cell */
}
/*
* Calculate the minHeight array values.
* First, figure out how tall the current slave needs to be.
* Then, see if it will fit within the current minHeight values.
* If it will not fit, add the difference according to the
* weightY array.
*/
pixels_diff = -1;
if (hasBaseline) {
switch(constraints.anchor) {
case GridBagConstraints.BASELINE:
}
else if (constraints.baselineResizeBehavior !=
}
else {
}
}
break;
break;
break;
}
}
if (pixels_diff == -1) {
}
pixels_diff -= r.minHeight[k];
if (pixels_diff > 0) {
weight = 0.0;
pixels_diff -= dy;
}
/* Any leftovers go into the bottom cell */
}
}
else if (constraints.tempHeight > i &&
}
}
return r;
}
} //getLayoutInfo()
/**
* Calculate the baseline for the specified component.
* If {@code c} is positioned along it's baseline, the baseline is
* obtained and the {@code constraints} ascent, descent and
* baseline resize behavior are set from the component; and true is
* returned. Otherwise false is returned.
*/
private boolean calculateBaseline(Component c,
// Apply the padding to the component, then ask for the baseline.
// Component has a baseline
// Adjust the ascent and descent to include the insets.
// Component has a baseline resize behavior of
// CENTER_OFFSET, calculate centerPadding and
// centerOffset (see the description of
// CENTER_OFFSET in the enum for detais on this
// algorithm).
if (h % 2 == 0) {
if (baseline != nextBaseline) {
}
}
else if (baseline == nextBaseline){
}
}
}
return true;
}
else {
return false;
}
}
/**
* Adjusts the x, y, width, and height fields to the correct
* values depending on the constraint geometry and pads.
* This method should only be used internally by
* <code>GridBagLayout</code>.
*
* @param constraints the constraints to be applied
* @param r the <code>Rectangle</code> to be adjusted
* @since 1.4
*/
Rectangle r) {
}
/**
* This method is obsolete and supplied for backwards
* compatability only; new code should call {@link
* #adjustForGravity(java.awt.GridBagConstraints, java.awt.Rectangle)
* adjustForGravity} instead.
* This method is the same as <code>adjustForGravity</code>;
* refer to <code>adjustForGravity</code> for details
* on parameters.
*/
Rectangle r) {
int cellY = r.y;
int cellHeight = r.height;
if (!rightToLeft) {
} else {
}
diffx = 0;
}
diffy = 0;
}
switch (constraints.anchor) {
case GridBagConstraints.BASELINE:
r.x += diffx/2;
break;
if (rightToLeft) {
r.x += diffx;
}
break;
if (!rightToLeft) {
r.x += diffx;
}
break;
r.x += diffx/2;
break;
if (rightToLeft) {
r.x += diffx;
}
break;
if (!rightToLeft) {
r.x += diffx;
}
break;
r.x += diffx/2;
break;
if (rightToLeft) {
r.x += diffx;
}
break;
if (!rightToLeft) {
r.x += diffx;
}
break;
case GridBagConstraints.CENTER:
r.x += diffx/2;
r.y += diffy/2;
break;
case GridBagConstraints.PAGE_START:
case GridBagConstraints.NORTH:
r.x += diffx/2;
break;
case GridBagConstraints.NORTHEAST:
r.x += diffx;
break;
case GridBagConstraints.EAST:
r.x += diffx;
r.y += diffy/2;
break;
case GridBagConstraints.SOUTHEAST:
r.x += diffx;
r.y += diffy;
break;
case GridBagConstraints.PAGE_END:
case GridBagConstraints.SOUTH:
r.x += diffx/2;
r.y += diffy;
break;
case GridBagConstraints.SOUTHWEST:
r.y += diffy;
break;
case GridBagConstraints.WEST:
r.y += diffy/2;
break;
case GridBagConstraints.NORTHWEST:
break;
case GridBagConstraints.LINE_START:
if (rightToLeft) {
r.x += diffx;
}
r.y += diffy/2;
break;
case GridBagConstraints.LINE_END:
if (!rightToLeft) {
r.x += diffx;
}
r.y += diffy/2;
break;
if (rightToLeft) {
r.x += diffx;
}
break;
if (!rightToLeft) {
r.x += diffx;
}
break;
if (rightToLeft) {
r.x += diffx;
}
r.y += diffy;
break;
if (!rightToLeft) {
r.x += diffx;
}
r.y += diffy;
break;
default:
throw new IllegalArgumentException("illegal anchor value");
}
}
/**
* Positions on the baseline.
*
* @param cellY the location of the row, does not include insets
* @param cellHeight the height of the row, does not take into account
* insets
* @param r available bounds for the component, is padded by insets and
* ipady
*/
int cellY, int cellHeight) {
// Anchor to the bottom.
// Baseline is at (cellY + cellHeight - maxDescent).
// Bottom of component (maxY) is at baseline + descent
// of component. We need to subtract the bottom inset here
// as the descent in the constraints object includes the
// bottom inset.
if (!cons.isVerticallyResizable()) {
// Component not resizable, calculate y location
// from maxY - height.
} else {
// Component is resizable. As brb is constant descent,
// can expand component to fill region above baseline.
// Subtract out the top inset so that components insets
// are honored.
}
}
else {
// BRB is not constant_descent
int baseline; // baseline for the row, relative to cellY
// Component baseline, includes insets.top
// off maxDescent
}
else {
}
// BRB is other, which means we can only determine
// the baseline by asking for it again giving the
// size we plan on using for the component.
boolean fits = false;
if (ascent >= 0) {
// Component has a baseline, pad with top inset
// (this follows from calculateBaseline which
// does the same).
}
// Components baseline fits within rows baseline.
// Make sure the descent fits within the space as well.
// It fits, we're good.
fits = true;
}
else if (cons.isVerticallyResizable()) {
// Doesn't fit, but it's resizable. Try
// again assuming we'll get ascent again.
if (ascent2 >= 0) {
}
// It'll fit
fits = true;
}
}
}
if (!fits) {
// Doesn't fit, use min size and original ascent
}
}
// Reset the components y location based on
// components ascent and baseline for row. Because ascent
// includes the baseline
if (cons.isVerticallyResizable()) {
switch(cons.baselineResizeBehavior) {
case CONSTANT_ASCENT:
break;
case CENTER_OFFSET:
{
if (delta > 0 &&
// Off by 1
delta--;
}
}
break;
case OTHER:
// Handled above
break;
default:
break;
}
}
}
}
else {
}
}
/**
* Positions the specified component above the baseline. That is
* the bottom edge of the component will be aligned along the baseline.
* If the row does not have a baseline, this centers the component.
*/
int cellY, int cellHeight) {
int maxY; // Baseline for the row
// Prefer descent
}
else {
// Prefer ascent
}
if (cons.isVerticallyResizable()) {
// Component is resizable. Top edge is offset by top
// inset, bottom edge on baseline.
}
else {
// Not resizable.
}
}
else {
}
}
/**
* Positions below the baseline.
*/
int cellY, int cellHeight) {
// Prefer descent
}
else {
// Prefer ascent
}
if (cons.isVerticallyResizable()) {
}
}
else {
}
}
int cellHeight) {
if (!cons.isVerticallyResizable()) {
}
}
/**
* Figures out the minimum size of the
* master based on the information from <code>getLayoutInfo</code>.
* This method should only be used internally by
* <code>GridBagLayout</code>.
*
* @param parent the layout container
* @param info the layout info for this parent
* @return a <code>Dimension</code> object containing the
* minimum size
* @since 1.4
*/
}
/**
* This method is obsolete and supplied for backwards
* compatability only; new code should call {@link
* #getMinSize(java.awt.Container, GridBagLayoutInfo) getMinSize} instead.
* This method is the same as <code>getMinSize</code>;
* refer to <code>getMinSize</code> for details on parameters
* and return value.
*/
int i, t;
t = 0;
t = 0;
return d;
}
transient boolean rightToLeft = false;
/**
* Lays out the grid.
* This method should only be used internally by
* <code>GridBagLayout</code>.
*
* @param parent the layout container
* @since 1.4
*/
}
/**
* This method is obsolete and supplied for backwards
* compatability only; new code should call {@link
* #arrangeGrid(Container) arrangeGrid} instead.
* This method is the same as <code>arrangeGrid</code>;
* refer to <code>arrangeGrid</code> for details on the
* parameter.
*/
int compindex;
Dimension d;
double weight;
/*
* If the parent has no slaves anymore, then don't do anything
* at all: just leave the parent's size as-is.
*/
return;
}
/*
* Pass #1: scan all the slaves to figure out the total amount
* of space needed.
*/
}
layoutInfo = info;
/*
* DEBUG
*
* DumpLayoutInfo(info);
* for (compindex = 0 ; compindex < components.length ; compindex++) {
* comp = components[compindex];
* if (!comp.isVisible())
* continue;
* constraints = lookupConstraints(comp);
* DumpConstraints(constraints);
* }
* System.out.println("minSize " + r.width + " " + r.height);
*/
/*
* If the current dimensions of the window don't match the desired
* dimensions, then adjust the minWidth and minHeight arrays
* according to the weights.
*/
if (diffw != 0) {
weight = 0.0;
if (weight > 0.0) {
}
}
}
}
else {
diffw = 0;
}
if (diffh != 0) {
weight = 0.0;
if (weight > 0.0) {
}
}
}
}
else {
diffh = 0;
}
/*
* DEBUG
*
* System.out.println("Re-adjusted:");
* DumpLayoutInfo(info);
*/
/*
* Now do the actual layout of the slaves using the layout information
* that has been collected.
*/
continue;
}
if (!rightToLeft) {
} else {
}
r.width = 0;
for(i = constraints.tempX;
i++) {
}
r.height = 0;
for(i = constraints.tempY;
i++) {
}
/* fix for 4408108 - components were being created outside of the container */
/* fix for 4969409 "-" replaced by "+" */
if (r.x < 0) {
r.width += r.x;
r.x = 0;
}
if (r.y < 0) {
r.height += r.y;
r.y = 0;
}
/*
* If the window is too small to be interesting then
* unmap it. Otherwise configure it and then make sure
* it's mapped.
*/
}
else {
}
}
}
}
// Added for serial backwards compatability (4348425)
static final long serialVersionUID = 8838754796412211005L;
}