/*
* Copyright (c) 2002-2004 JGoodies Karsten Lentzsch. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* o Neither the name of JGoodies Karsten Lentzsch nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jgoodies.forms.layout;
import java.awt.Component;
import java.awt.Insets;
import java.awt.Rectangle;
import java.io.Serializable;
import java.util.StringTokenizer;
/**
* Defines constraints for components that are layed out with the FormLayout.
* Defines the components display area: grid x, grid y, grid width
* (column span), grid height (row span), horizontal alignment and vertical
* alignment.
* <p>
*
* Most methods return <em>this</em> object to enable method chaining.
* <p>
*
* You can set optional insets in a constructor. This is useful if you need to
* use a pixel-size insets to align perceived component bounds with pixel data,
* for example an icon. Anyway, this is rarely used. The insets don't affect the
* size computation for columns and rows. I consider renaming the insets to
* offsets to better indicate the motivation for this option.
* <p>
*
* <strong>Examples</strong>:<br>
* The following cell constraints locate a component in the third column of the
* fifth row; column and row span are 1; the component will be aligned with the
* column's right-hand side and the row's bottom.
*
* <pre>
* CellConstraints cc = new CellConstraints();
* cc.xy(3, 5);
* cc.xy(3, 5, CellConstraints.RIGHT, CellConstraints.BOTTOM);
* cc.xy(3, 5, "right, bottom");
*
* cc.xyw(3, 5, 1);
* cc.xyw(3, 5, 1, CellConstraints.RIGHT, CellConstraints.BOTTOM);
* cc.xyw(3, 5, 1, "right, bottom");
*
* cc.xywh(3, 5, 1, 1);
* cc.xywh(3, 5, 1, 1, CellConstraints.RIGHT, CellConstraints.BOTTOM);
* cc.xywh(3, 5, 1, 1, "right, bottom");
* </pre>
*
* See also the examples in the {@link FormLayout} class comment.
* <p>
*
* TODO: Consider renaming the inset to offsets.
*
* @author Karsten Lentzsch
* @version $Revision: 1.2 $
*/
public final class CellConstraints implements Cloneable, Serializable {
// Alignment Constants *************************************************
/*
* Implementation Note: Do not change the order of the following constants.
* The serialization of class Alignment is ordinal-based and relies on it.
*/
/**
* Use the column's or row's default alignment.
*/
public static final Alignment DEFAULT = new Alignment("default", Alignment.BOTH);
/**
* Fill the cell either horizontally or vertically.
*/
public static final Alignment FILL = new Alignment("fill", Alignment.BOTH);
/**
* Put the component in the left.
*/
public static final Alignment LEFT = new Alignment("left", Alignment.HORIZONTAL);
/**
* Put the component in the right.
*/
public static final Alignment RIGHT = new Alignment("right", Alignment.HORIZONTAL);
/**
* Put the component in the center.
*/
public static final Alignment CENTER = new Alignment("center", Alignment.BOTH);
/**
* Put the component in the top.
*/
public static final Alignment TOP = new Alignment("top", Alignment.VERTICAL);
/**
* Put the component in the bottom.
*/
public static final Alignment BOTTOM = new Alignment("bottom", Alignment.VERTICAL);
/**
* An array of all enumeration values used to canonicalize deserialized
* alignments.
*/
private static final Alignment[] VALUES = { DEFAULT, FILL, LEFT, RIGHT, CENTER, TOP, BOTTOM };
/**
* A reusable <code>Insets</code> object to reduce object instantiation.
*/
private static final Insets EMPTY_INSETS = new Insets(0, 0, 0, 0);
// Fields ***************************************************************
/**
* Describes the component's horizontal grid origin (starts at 1).
*/
public int gridX;
/**
* Describes the component's vertical grid origin (starts at 1).
*/
public int gridY;
/**
* Describes the component's horizontal grid extend (number of cells).
*/
public int gridWidth;
/**
* Describes the component's vertical grid extent (number of cells).
*/
public int gridHeight;
/**
* Describes the component's horizontal alignment.
*/
public Alignment hAlign;
/**
* Describes the component's vertical alignment.
*/
public Alignment vAlign;
/**
* Describes the component's <code>Insets</code> in it's display area.
*/
public Insets insets;
// Instance Creation ****************************************************
/**
* Constructs a default instance of <code>CellConstraints</code>.
*/
public CellConstraints() {
this(1, 1);
}
/**
* Constructs an instance of <code>CellConstraints</code> for the given
* cell position.
* <p>
*
* <strong>Examples:</strong>
*
* <pre>
* new CellConstraints(1, 3);
* new CellConstraints(1, 3);
* </pre>
*
* @param gridX
* the component's horizontal grid origin
* @param gridY
* the component's vertical grid origin
*/
public CellConstraints(int gridX, int gridY) {
this(gridX, gridY, 1, 1);
}
/**
* Constructs an instance of <code>CellConstraints</code> for the given
* cell position, anchor, and fill.
* <p>
*
* <strong>Examples:</strong>
*
* <pre>
* new CellConstraints(1, 3, CellConstraints.LEFT, CellConstraints.BOTTOM);
* new CellConstraints(1, 3, CellConstraints.CENTER, CellConstraints.FILL);
* </pre>
*
* @param gridX
* the component's horizontal grid origin
* @param gridY
* the component's vertical grid origin
* @param hAlign
* the component's horizontal alignment
* @param vAlign
* the component's vertical alignment
*/
public CellConstraints(int gridX, int gridY, Alignment hAlign, Alignment vAlign) {
this(gridX, gridY, 1, 1, hAlign, vAlign, EMPTY_INSETS);
}
/**
* Constructs an instance of <code>CellConstraints</code> for the given
* cell position and size.
* <p>
*
* <strong>Examples:</strong>
*
* <pre>
* new CellConstraints(1, 3, 2, 1);
* new CellConstraints(1, 3, 7, 3);
* </pre>
*
* @param gridX
* the component's horizontal grid origin
* @param gridY
* the component's vertical grid origin
* @param gridWidth
* the component's horizontal extent
* @param gridHeight
* the component's vertical extent
*/
public CellConstraints(int gridX, int gridY, int gridWidth, int gridHeight) {
this(gridX, gridY, gridWidth, gridHeight, DEFAULT, DEFAULT);
}
/**
* Constructs an instance of <code>CellConstraints</code> for the given
* cell position and size, anchor, and fill.
* <p>
*
* <strong>Examples:</strong>
*
* <pre>
* new CellConstraints(1, 3, 2, 1, CellConstraints.LEFT, CellConstraints.BOTTOM);
* new CellConstraints(1, 3, 7, 3, CellConstraints.CENTER, CellConstraints.FILL);
* </pre>
*
* @param gridX
* the component's horizontal grid origin
* @param gridY
* the component's vertical grid origin
* @param gridWidth
* the component's horizontal extent
* @param gridHeight
* the component's vertical extent
* @param hAlign
* the component's horizontal alignment
* @param vAlign
* the component's vertical alignment
*/
public CellConstraints(int gridX, int gridY, int gridWidth, int gridHeight, Alignment hAlign, Alignment vAlign) {
this(gridX, gridY, gridWidth, gridHeight, hAlign, vAlign, EMPTY_INSETS);
}
/**
* Constructs an instance of <code>CellConstraints</code> for the complete
* set of available properties.
* <p>
*
* <strong>Examples:</strong>
*
* <pre>
* new CellConstraints(1, 3, 2, 1, CellConstraints.LEFT, CellConstraints.BOTTOM, new Insets(0, 1, 0, 3));
* new CellConstraints(1, 3, 7, 3, CellConstraints.CENTER, CellConstraints.FILL, new Insets(0, 1, 0, 0));
* </pre>
*
* @param gridX
* the component's horizontal grid origin
* @param gridY
* the component's vertical grid origin
* @param gridWidth
* the component's horizontal extent
* @param gridHeight
* the component's vertical extent
* @param hAlign
* the component's horizontal alignment
* @param vAlign
* the component's vertical alignment
* @param insets
* the component's display area <code>Insets</code>
* @throws IndexOutOfBoundsException
* if the grid origin or extent is negative
* @throws NullPointerException
* if the horizontal or vertical alignment is null
* @throws IllegalArgumentException
* if an alignment orientation is invalid
*/
public CellConstraints(int gridX, int gridY, int gridWidth, int gridHeight, Alignment hAlign, Alignment vAlign, Insets insets) {
this.gridX = gridX;
this.gridY = gridY;
this.gridWidth = gridWidth;
this.gridHeight = gridHeight;
this.hAlign = hAlign;
this.vAlign = vAlign;
this.insets = insets;
if (gridX <= 0)
throw new IndexOutOfBoundsException("The grid x must be a positive number.");
if (gridY <= 0)
throw new IndexOutOfBoundsException("The grid y must be a positive number.");
if (gridWidth <= 0)
throw new IndexOutOfBoundsException("The grid width must be a positive number.");
if (gridHeight <= 0)
throw new IndexOutOfBoundsException("The grid height must be a positive number.");
if (hAlign == null)
throw new NullPointerException("The horizontal alignment must not be null.");
if (vAlign == null)
throw new NullPointerException("The vertical alignment must not be null.");
ensureValidOrientations(hAlign, vAlign);
}
/**
* Constructs an instance of <code>CellConstraints</code> from the given
* encoded string properties.
* <p>
*
* <strong>Examples:</strong>
*
* <pre>
* new CellConstraints("1, 3");
* new CellConstraints("1, 3, left, bottom");
* new CellConstraints("1, 3, 2, 1, left, bottom");
* new CellConstraints("1, 3, 2, 1, l, b");
* </pre>
*
* @param encodedConstraints
* the constraints encoded as string
*/
public CellConstraints(String encodedConstraints) {
this();
initFromConstraints(encodedConstraints);
}
// Setters **************************************************************
/**
* Sets row and column origins; sets width and height to 1; uses the default
* alignments.
* <p>
*
* <strong>Examples:</strong>
*
* <pre>
* cc.xy(1, 1);
* cc.xy(1, 3);
* </pre>
*
* @param col
* the new column index
* @param row
* the new row index
* @return this
*/
public CellConstraints xy(int col, int row) {
return xywh(col, row, 1, 1);
}
/**
* Sets row and column origins; sets width and height to 1; decodes
* horizontal and vertical alignments from the given string.
* <p>
*
* <strong>Examples:</strong>
*
* <pre>
* cc.xy(1, 3, "left, bottom");
* cc.xy(1, 3, "l, b");
* cc.xy(1, 3, "center, fill");
* cc.xy(1, 3, "c, f");
* </pre>
*
* @param col
* the new column index
* @param row
* the new row index
* @param encodedAlignments
* describes the horizontal and vertical alignments
* @return this
* @throws IllegalArgumentException
* if an alignment orientation is invalid
*/
public CellConstraints xy(int col, int row, String encodedAlignments) {
return xywh(col, row, 1, 1, encodedAlignments);
}
/**
* Sets the row and column origins; sets width and height to 1; set
* horizontal and vertical alignment using the specified objects.
* <p>
*
* <strong>Examples:</strong>
*
* <pre>
* cc.xy(1, 3, CellConstraints.LEFT, CellConstraints.BOTTOM);
* cc.xy(1, 3, CellConstraints.CENTER, CellConstraints.FILL);
* </pre>
*
* @param col
* the new column index
* @param row
* the new row index
* @param colAlign
* horizontal component alignment
* @param rowAlign
* vertical component alignment
* @return this
*/
public CellConstraints xy(int col, int row, Alignment colAlign, Alignment rowAlign) {
return xywh(col, row, 1, 1, colAlign, rowAlign);
}
/**
* Sets the row, column, width, and height; uses a height (row span) of 1
* and the horizontal and vertical default alignments.
* <p>
*
* <strong>Examples:</strong>
*
* <pre>
* cc.xyw(1, 3, 7);
* cc.xyw(1, 3, 2);
* </pre>
*
* @param col
* the new column index
* @param row
* the new row index
* @param colSpan
* the column span or grid width
* @return this
*/
public CellConstraints xyw(int col, int row, int colSpan) {
return xywh(col, row, colSpan, 1, DEFAULT, DEFAULT);
}
/**
* Sets the row, column, width, and height; decodes the horizontal and
* vertical alignments from the given string. The row span (height) is set
* to 1.
* <p>
*
* <strong>Examples:</strong>
*
* <pre>
* cc.xyw(1, 3, 7, "left, bottom");
* cc.xyw(1, 3, 7, "l, b");
* cc.xyw(1, 3, 2, "center, fill");
* cc.xyw(1, 3, 2, "c, f");
* </pre>
*
* @param col
* the new column index
* @param row
* the new row index
* @param colSpan
* the column span or grid width
* @param encodedAlignments
* describes the horizontal and vertical alignments
* @return this
* @throws IllegalArgumentException
* if an alignment orientation is invalid
*/
public CellConstraints xyw(int col, int row, int colSpan, String encodedAlignments) {
return xywh(col, row, colSpan, 1, encodedAlignments);
}
/**
* Sets the row, column, width, and height; sets the horizontal and vertical
* aligment using the specified alignment objects. The row span (height) is
* set to 1.
* <p>
*
* <strong>Examples:</strong>
*
* <pre>
* cc.xyw(1, 3, 2, CellConstraints.LEFT, CellConstraints.BOTTOM);
* cc.xyw(1, 3, 7, CellConstraints.CENTER, CellConstraints.FILL);
* </pre>
*
* @param col
* the new column index
* @param row
* the new row index
* @param colSpan
* the column span or grid width
* @param colAlign
* horizontal component alignment
* @param rowAlign
* vertical component alignment
* @return this
* @throws IllegalArgumentException
* if an alignment orientation is invalid
*/
public CellConstraints xyw(int col, int row, int colSpan, Alignment colAlign, Alignment rowAlign) {
return xywh(col, row, colSpan, 1, colAlign, rowAlign);
}
/**
* Sets the row, column, width, and height; uses default alignments.
* <p>
*
* <strong>Examples:</strong>
*
* <pre>
* cc.xywh(1, 3, 2, 1);
* cc.xywh(1, 3, 7, 3);
* </pre>
*
* @param col
* the new column index
* @param row
* the new row index
* @param colSpan
* the column span or grid width
* @param rowSpan
* the row span or grid height
* @return this
*/
public CellConstraints xywh(int col, int row, int colSpan, int rowSpan) {
return xywh(col, row, colSpan, rowSpan, DEFAULT, DEFAULT);
}
/**
* Sets the row, column, width, and height; decodes the horizontal and
* vertical alignments from the given string.
* <p>
*
* <strong>Examples:</strong>
*
* <pre>
* cc.xywh(1, 3, 2, 1, "left, bottom");
* cc.xywh(1, 3, 2, 1, "l, b");
* cc.xywh(1, 3, 7, 3, "center, fill");
* cc.xywh(1, 3, 7, 3, "c, f");
* </pre>
*
* @param col
* the new column index
* @param row
* the new row index
* @param colSpan
* the column span or grid width
* @param rowSpan
* the row span or grid height
* @param encodedAlignments
* describes the horizontal and vertical alignments
* @return this
* @throws IllegalArgumentException
* if an alignment orientation is invalid
*/
public CellConstraints xywh(int col, int row, int colSpan, int rowSpan, String encodedAlignments) {
CellConstraints result = xywh(col, row, colSpan, rowSpan);
result.setAlignments(encodedAlignments);
return result;
}
/**
* Sets the row, column, width, and height; sets the horizontal and vertical
* aligment using the specified alignment objects.
* <p>
*
* <strong>Examples:</strong>
*
* <pre>
* cc.xywh(1, 3, 2, 1, CellConstraints.LEFT, CellConstraints.BOTTOM);
* cc.xywh(1, 3, 7, 3, CellConstraints.CENTER, CellConstraints.FILL);
* </pre>
*
* @param col
* the new column index
* @param row
* the new row index
* @param colSpan
* the column span or grid width
* @param rowSpan
* the row span or grid height
* @param colAlign
* horizontal component alignment
* @param rowAlign
* vertical component alignment
* @return this
* @throws IllegalArgumentException
* if an alignment orientation is invalid
*/
public CellConstraints xywh(int col, int row, int colSpan, int rowSpan, Alignment colAlign, Alignment rowAlign) {
this.gridX = col;
this.gridY = row;
this.gridWidth = colSpan;
this.gridHeight = rowSpan;
this.hAlign = colAlign;
this.vAlign = rowAlign;
ensureValidOrientations(hAlign, vAlign);
return this;
}
// Parsing and Decoding String Descriptions *****************************
/**
* Decodes and returns the grid bounds and alignments for this constraints
* as an array of six integers. The string representation is a comma
* separated sequence, one of
*
* <pre>
* "x, y"
* "x, y, w, h"
* "x, y, hAlign, vAlign"
* "x, y, w, h, hAlign, vAlign"
* </pre>
*
* @param encodedConstraints
* represents horizontal and vertical alignment
* @throws IllegalArgumentException
* if the encoded constraints do not follow the constraint
* syntax
*/
private void initFromConstraints(String encodedConstraints) {
StringTokenizer tokenizer = new StringTokenizer(encodedConstraints, " ,");
int argCount = tokenizer.countTokens();
if (!(argCount == 2 || argCount == 4 || argCount == 6))
throw new IllegalArgumentException("You must provide 2, 4 or 6 arguments.");
Integer nextInt = decodeInt(tokenizer.nextToken());
if (nextInt == null) {
throw new IllegalArgumentException("First cell constraint element must be a number.");
}
gridX = nextInt.intValue();
if (gridX <= 0)
throw new IndexOutOfBoundsException("The grid x must be a positive number.");
nextInt = decodeInt(tokenizer.nextToken());
if (nextInt == null) {
throw new IllegalArgumentException("Second cell constraint element must be a number.");
}
gridY = nextInt.intValue();
if (gridY <= 0)
throw new IndexOutOfBoundsException("The grid y must be a positive number.");
if (!tokenizer.hasMoreTokens())
return;
String token = tokenizer.nextToken();
nextInt = decodeInt(token);
if (nextInt != null) {
// Case: "x, y, w, h" or
// "x, y, w, h, hAlign, vAlign"
gridWidth = nextInt.intValue();
if (gridWidth <= 0)
throw new IndexOutOfBoundsException("The grid width must be a positive number.");
nextInt = decodeInt(tokenizer.nextToken());
if (nextInt == null)
throw new IllegalArgumentException("Fourth cell constraint element must be like third.");
gridHeight = nextInt.intValue();
if (gridHeight <= 0)
throw new IndexOutOfBoundsException("The grid height must be a positive number.");
if (!tokenizer.hasMoreTokens())
return;
token = tokenizer.nextToken();
}
hAlign = decodeAlignment(token);
vAlign = decodeAlignment(tokenizer.nextToken());
ensureValidOrientations(hAlign, vAlign);
}
/**
* Decodes a string description for the horizontal and vertical alignment
* and set the alignment values.
* <p>
* Valid horizontal aligmnents are: left, middle, right, default, and fill.
* Valid vertical alignments are: top, center, bottom, default, and fill.
* The anchor's string representation abbreviates the alignment: l, m, r, d,
* f, t, c, and b.
* <p>
* Anchor examples: "mc" is centered, "lt" is northwest, "mt" is north, "rc"
* east. "md" is horizontally centered and uses the row's default alignment.
* "dt" is on top of the cell and uses the column's default alignment.
* <p>
*
* @param encodedAlignments
* represents horizontal and vertical alignment
* @throws IllegalArgumentException
* if an alignment orientation is invalid
*/
private void setAlignments(String encodedAlignments) {
StringTokenizer tokenizer = new StringTokenizer(encodedAlignments, " ,");
hAlign = decodeAlignment(tokenizer.nextToken());
vAlign = decodeAlignment(tokenizer.nextToken());
ensureValidOrientations(hAlign, vAlign);
}
/**
* Decodes an integer string representation and returns the associated
* Integer or null in case of an invalid number format.
*
* @param token
* the encoded integer
* @return the decoded Integer or null
*/
private Integer decodeInt(String token) {
try {
return Integer.decode(token);
} catch (NumberFormatException e) {
return null;
}
}
/**
* Parses an alignment string description and returns the corresponding
* alignment value.
*
* @param encodedAlignment
* the encoded alignment
* @return the associated <code>Alignment</code> instance
*/
private Alignment decodeAlignment(String encodedAlignment) {
return Alignment.valueOf(encodedAlignment);
}
/**
* Checks and verifies that this constraints object has valid grid index
* values, i. e. the display area cells are inside the form's grid.
*
* @param colCount
* number of columns in the grid
* @param rowCount
* number of rows in the grid
* @throws IndexOutOfBoundsException
* if the display area described by this constraints object is
* not inside the grid
*/
void ensureValidGridBounds(int colCount, int rowCount) {
if (gridX <= 0) {
throw new IndexOutOfBoundsException("The column index " + gridX + " must be positive.");
}
if (gridX > colCount) {
throw new IndexOutOfBoundsException("The column index " + gridX + " must be less than or equal to " + colCount + ".");
}
if (gridX + gridWidth - 1 > colCount) {
throw new IndexOutOfBoundsException("The grid width " + gridWidth + " must be less than or equal to " + (colCount - gridX + 1) + ".");
}
if (gridY <= 0) {
throw new IndexOutOfBoundsException("The row index " + gridY + " must be positive.");
}
if (gridY > rowCount) {
throw new IndexOutOfBoundsException("The row index " + gridY + " must be less than or equal to " + rowCount + ".");
}
if (gridY + gridHeight - 1 > rowCount) {
throw new IndexOutOfBoundsException("The grid height " + gridHeight + " must be less than or equal to " + (rowCount - gridY + 1) + ".");
}
}
/**
* Checks and verifies that the horizontal alignment is a horizontal and the
* vertical alignment is vertical.
*
* @param horizontalAlignment
* the horizontal alignment
* @param verticalAlignment
* the vertical alignment
* @throws IllegalArgumentException
* if an alignment is invalid
*/
private void ensureValidOrientations(Alignment horizontalAlignment, Alignment verticalAlignment) {
if (!horizontalAlignment.isHorizontal())
throw new IllegalArgumentException("The horizontal alignment must be one of: left, center, right, fill, default.");
if (!verticalAlignment.isVertical())
throw new IllegalArgumentException("The vertical alignment must be one of: top, center, botto, fill, default.");
}
// Settings Component Bounds ********************************************
/**
* Sets the component's bounds using the given component and cell bounds.
*
* @param c
* the component to set bounds
* @param layout
* the FormLayout instance that computes the bounds
* @param cellBounds
* the cell's bounds
* @param minWidthMeasure
* measures the minimum width
* @param minHeightMeasure
* measures the minimum height
* @param prefWidthMeasure
* measures the preferred width
* @param prefHeightMeasure
* measures the preferred height
*/
void setBounds(Component c, FormLayout layout, Rectangle cellBounds, FormLayout.Measure minWidthMeasure, FormLayout.Measure minHeightMeasure,
FormLayout.Measure prefWidthMeasure, FormLayout.Measure prefHeightMeasure) {
ColumnSpec colSpec = gridWidth == 1 ? layout.getColumnSpec(gridX) : null;
RowSpec rowSpec = gridHeight == 1 ? layout.getRowSpec(gridY) : null;
Alignment concreteHAlign = concreteAlignment(this.hAlign, colSpec);
Alignment concreteVAlign = concreteAlignment(this.vAlign, rowSpec);
Insets concreteInsets = this.insets != null ? this.insets : EMPTY_INSETS;
int cellX = cellBounds.x + concreteInsets.left;
int cellY = cellBounds.y + concreteInsets.top;
int cellW = cellBounds.width - concreteInsets.left - concreteInsets.right;
int cellH = cellBounds.height - concreteInsets.top - concreteInsets.bottom;
int compW = componentSize(c, colSpec, cellW, minWidthMeasure, prefWidthMeasure);
int compH = componentSize(c, rowSpec, cellH, minHeightMeasure, prefHeightMeasure);
int x = origin(concreteHAlign, cellX, cellW, compW);
int y = origin(concreteVAlign, cellY, cellH, compH);
int w = extent(concreteHAlign, cellW, compW);
int h = extent(concreteVAlign, cellH, compH);
c.setBounds(x, y, w, h);
}
/**
* Computes and returns the concrete alignment. Takes into account the cell
* alignment and <i>the</i> <code>FormSpec</code> if applicable.
* <p>
*
* If this constraints object doesn't belong to a single column or row, the
* <code>formSpec</code> parameter is <code>null</code>. In this case
* the cell alignment is answered, but <code>DEFAULT</code> is mapped to
* <code>FILL</code>.
* <p>
*
* If the cell belongs to a single column or row, we use the cell alignment,
* unless it is <code>DEFAULT</code>, where the alignment is inherited
* from the column or row resp.
*
* @param cellAlignment
* this cell's aligment
* @param formSpec
* the associated column or row specification
* @return the concrete alignment
*/
private Alignment concreteAlignment(Alignment cellAlignment, FormSpec formSpec) {
return formSpec == null ? (cellAlignment == DEFAULT ? FILL : cellAlignment) : usedAlignment(cellAlignment, formSpec);
}
/**
* Returns the alignment used for a given form constraints object. The cell
* alignment overrides the column or row default, unless it is
* <code>DEFAULT</code>. In the latter case, we use the column or row
* alignment.
*
* @param cellAlignment
* this cell constraint's alignment
* @param formSpec
* the associated column or row specification
* @return the alignment used
*/
private Alignment usedAlignment(Alignment cellAlignment, FormSpec formSpec) {
if (cellAlignment != CellConstraints.DEFAULT) {
// Cell alignments other than DEFAULT override col/row alignments
return cellAlignment;
}
FormSpec.DefaultAlignment defaultAlignment = formSpec.getDefaultAlignment();
if (defaultAlignment == FormSpec.FILL_ALIGN)
return FILL;
if (defaultAlignment == ColumnSpec.LEFT)
return LEFT;
else if (defaultAlignment == FormSpec.CENTER_ALIGN)
return CENTER;
else if (defaultAlignment == ColumnSpec.RIGHT)
return RIGHT;
else if (defaultAlignment == RowSpec.TOP)
return TOP;
else
return BOTTOM;
}
/**
* Computes and returns the pixel size of the given component using the
* given form specification, measures, and cell size.
*
* @param component
* the component to measure
* @param formSpec
* the specification of the component's column/row
* @param minMeasure
* the measure for the minimum size
* @param prefMeasure
* the measure for the preferred size
* @param cellSize
* the cell size
* @return the component size as measured or a constant
*/
private int componentSize(Component component, FormSpec formSpec, int cellSize, FormLayout.Measure minMeasure, FormLayout.Measure prefMeasure) {
if (formSpec == null) {
return prefMeasure.sizeOf(component);
}
else if (formSpec.getSize() == Sizes.MINIMUM) {
return minMeasure.sizeOf(component);
}
else if (formSpec.getSize() == Sizes.PREFERRED) {
return prefMeasure.sizeOf(component);
}
else { // default mode
return Math.min(cellSize, prefMeasure.sizeOf(component));
}
}
/**
* Computes and returns the component's pixel origin.
*
* @param alignment
* the component's alignment
* @param cellOrigin
* the origin of the display area
* @param cellSize
* the extent of the display area
* @param componentSize
* @return the component's pixel origin
*/
private int origin(Alignment alignment, int cellOrigin, int cellSize, int componentSize) {
if (alignment == RIGHT || alignment == BOTTOM) {
return cellOrigin + cellSize - componentSize;
}
else if (alignment == CENTER) {
return cellOrigin + (cellSize - componentSize) / 2;
}
else { // left, top, fill
return cellOrigin;
}
}
/**
* Returns the component's pixel extent.
*
* @param alignment
* the component's alignment
* @param cellSize
* the size of the display area
* @param componentSize
* the component's size
* @return the component's pixel extent
*/
private int extent(Alignment alignment, int cellSize, int componentSize) {
return alignment == FILL ? cellSize : componentSize;
}
// Misc *****************************************************************
/**
* Creates a copy of this cell constraints object.
*
* @return a copy of this cell constraints object
*/
public Object clone() {
try {
CellConstraints c = (CellConstraints) super.clone();
c.insets = (Insets) insets.clone();
return c;
} catch (CloneNotSupportedException e) {
// This shouldn't happen, since we are Cloneable.
throw new InternalError();
}
}
/**
* Constructs and returns a string representation of this constraints
* object.
*
* @return string representation of this constraints object
*/
public String toString() {
StringBuffer buffer = new StringBuffer("CellConstraints");
buffer.append("[x=");
buffer.append(gridX);
buffer.append("; y=");
buffer.append(gridY);
buffer.append("; w=");
buffer.append(gridWidth);
buffer.append("; h=");
buffer.append(gridHeight);
buffer.append("; hAlign=");
buffer.append(hAlign);
buffer.append("; vAlign=");
buffer.append(vAlign);
if (!(EMPTY_INSETS.equals(insets))) {
buffer.append("; insets=");
buffer.append(insets);
}
buffer.append(']');
return buffer.toString();
}
/**
* Returns a short string representation of this constraints object.
*
* @return a short string representation of this constraints object
*/
public String toShortString() {
return toShortString(null);
}
/**
* Returns a short string representation of this constraints object. This
* method can use the given <code>FormLayout</code> to display extra
* information how default alignments are mapped to concrete alignments.
* Therefore it asks the related column and row as specified by this
* constraints object.
*
* @param layout
* the layout to be presented as a string
* @return a short string representation of this constraints object
*/
public String toShortString(FormLayout layout) {
StringBuffer buffer = new StringBuffer("(");
buffer.append(formatInt(gridX));
buffer.append(", ");
buffer.append(formatInt(gridY));
buffer.append(", ");
buffer.append(formatInt(gridWidth));
buffer.append(", ");
buffer.append(formatInt(gridHeight));
buffer.append(", \"");
buffer.append(hAlign.abbreviation());
if (hAlign == DEFAULT && layout != null) {
buffer.append('=');
ColumnSpec colSpec = gridWidth == 1 ? layout.getColumnSpec(gridX) : null;
buffer.append(concreteAlignment(hAlign, colSpec).abbreviation());
}
buffer.append(", ");
buffer.append(vAlign.abbreviation());
if (vAlign == DEFAULT && layout != null) {
buffer.append('=');
RowSpec rowSpec = gridHeight == 1 ? layout.getRowSpec(gridY) : null;
buffer.append(concreteAlignment(vAlign, rowSpec).abbreviation());
}
buffer.append("\"");
if (!(EMPTY_INSETS.equals(insets))) {
buffer.append(", ");
buffer.append(insets);
}
buffer.append(')');
return buffer.toString();
}
// Helper Class *********************************************************
/**
* An ordinal-based serializable typesafe enumeration for component
* alignment types as used by the {@link FormLayout}.
*/
public static final class Alignment implements Serializable {
private static final int HORIZONTAL = 0;
private static final int VERTICAL = 1;
private static final int BOTH = 2;
private final transient String name;
private final transient int orientation;
private Alignment(String name, int orientation) {
this.name = name;
this.orientation = orientation;
}
static Alignment valueOf(String nameOrAbbreviation) {
String str = nameOrAbbreviation.toLowerCase();
if (str.equals("d") || str.equals("default"))
return DEFAULT;
else if (str.equals("f") || str.equals("fill"))
return FILL;
else if (str.equals("c") || str.equals("center"))
return CENTER;
else if (str.equals("l") || str.equals("left"))
return LEFT;
else if (str.equals("r") || str.equals("right"))
return RIGHT;
else if (str.equals("t") || str.equals("top"))
return TOP;
else if (str.equals("b") || str.equals("bottom"))
return BOTTOM;
else
throw new IllegalArgumentException("Invalid alignment " + nameOrAbbreviation + ". Must be one of: left, center, right, top, bottom, "
+ "fill, default, l, c, r, t, b, f, d.");
}
/**
* Returns this Alignment's name.
*
* @return this alignment's name.
*/
public String toString() {
return name;
}
/**
* Returns the first character of this Alignment's name. Used to
* identify it in short format strings.
*
* @return the name's first character.
*/
public char abbreviation() {
return name.charAt(0);
}
private boolean isHorizontal() {
return orientation != VERTICAL;
}
private boolean isVertical() {
return orientation != HORIZONTAL;
}
// Serialization
// *********************************************************
private static int nextOrdinal = 0;
private final int ordinal = nextOrdinal++;
private Object readResolve() {
return VALUES[ordinal]; // Canonicalize
}
}
/**
* Returns an integer that has a minimum of two characters.
*
* @param number
* the number to format
* @return a string representation for a number with a minum of two chars
*/
private String formatInt(int number) {
String str = Integer.toString(number);
return number < 10 ? " " + str : str;
}
}
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