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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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.
*
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package sun.awt;
import java.awt.*;
import java.util.BitSet;
/**
* A layout manager for a container that lays out grids. Allows setting
* the relative sizes of rows and columns.
*
* @author Herb Jellinek
*/
public class VariableGridLayout extends GridLayout {
BitSet rowsSet = new BitSet();
double rowFractions[] = null;
BitSet colsSet = new BitSet();
double colFractions[] = null;
int rows;
int cols;
int hgap;
int vgap;
/**
* Creates a grid layout with the specified rows and specified columns.
* @param rows the rows
* @param cols the columns
*/
public VariableGridLayout(int rows, int cols) {
this(rows, cols, 0, 0);
if (rows != 0) {
rowsSet = new BitSet(rows);
stdRowFractions(rows);
}
if (cols != 0) {
colsSet = new BitSet(cols);
stdColFractions(cols);
}
}
/**
* Creates a grid layout with the specified rows, columns,
* horizontal gap, and vertical gap.
* @param rows the rows
* @param cols the columns
* @param hgap the horizontal gap variable
* @param vgap the vertical gap variable
* @exception IllegalArgumentException If the rows and columns are invalid.
*/
public VariableGridLayout(int rows, int cols, int hgap, int vgap) {
super(rows, cols, hgap, vgap);
this.rows = rows;
this.cols = cols;
this.hgap = hgap;
this.vgap = vgap;
if (rows != 0) {
rowsSet = new BitSet(rows);
stdRowFractions(rows);
}
if (cols != 0) {
colsSet = new BitSet(cols);
stdColFractions(cols);
}
}
void stdRowFractions(int nrows) {
rowFractions = new double[nrows];
for (int i = 0; i < nrows; i++) {
rowFractions[i] = 1.0 / nrows;
}
}
void stdColFractions(int ncols) {
colFractions = new double[ncols];
for (int i = 0; i < ncols; i++) {
colFractions[i] = 1.0 / ncols;
}
}
public void setRowFraction(int rowNum, double fraction) {
rowsSet.set(rowNum);
rowFractions[rowNum] = fraction;
}
public void setColFraction(int colNum, double fraction) {
colsSet.set(colNum);
colFractions[colNum] = fraction;
}
public double getRowFraction(int rowNum) {
return rowFractions[rowNum];
}
public double getColFraction(int colNum) {
return colFractions[colNum];
}
void allocateExtraSpace(double vec[], BitSet userSet) {
// collect the space that's been explicitly allocated...
double total = 0.0;
int unallocated = 0;
int i;
for (i = 0; i < vec.length; i++) {
if (userSet.get(i)) {
total += vec[i];
} else {
unallocated++;
}
}
// ... then spread the extra space
if (unallocated != 0) {
double space = (1.0 - total) / unallocated;
for (i = 0; i < vec.length; i++) {
if (!userSet.get(i)) {
vec[i] = space;
userSet.set(i);
}
}
}
}
void allocateExtraSpace() {
allocateExtraSpace(rowFractions, rowsSet);
allocateExtraSpace(colFractions, colsSet);
}
/**
* Lays out the container in the specified panel.
* @param parent the specified component being laid out
* @see Container
*/
public void layoutContainer(Container parent) {
Insets insets = parent.insets();
int ncomponents = parent.countComponents();
int nrows = rows;
int ncols = cols;
if (nrows > 0) {
ncols = (ncomponents + nrows - 1) / nrows;
} else {
nrows = (ncomponents + ncols - 1) / ncols;
}
if (rows == 0) {
stdRowFractions(nrows);
}
if (cols == 0) {
stdColFractions(ncols);
}
Dimension size = parent.size();
int w = size.width - (insets.left + insets.right);
int h = size.height - (insets.top + insets.bottom);
w = (w - (ncols - 1) * hgap);
h = (h - (nrows - 1) * vgap);
allocateExtraSpace();
for (int c = 0, x = insets.left ; c < ncols ; c++) {
int colWidth = (int)(getColFraction(c) * w);
for (int r = 0, y = insets.top ; r < nrows ; r++) {
int i = r * ncols + c;
int rowHeight = (int)(getRowFraction(r) * h);
if (i < ncomponents) {
parent.getComponent(i).reshape(x, y, colWidth, rowHeight);
}
y += rowHeight + vgap;
}
x += colWidth + hgap;
}
}
static String fracsToString(double array[]) {
String result = "["+array.length+"]";
for (int i = 0; i < array.length; i++) {
result += "<"+array[i]+">";
}
return result;
}
/**
* Returns the String representation of this VariableGridLayout's values.
*/
public String toString() {
return getClass().getName() + "[hgap=" + hgap + ",vgap=" + vgap +
",rows=" + rows + ",cols=" + cols +
",rowFracs=" +
fracsToString(rowFractions) +
",colFracs=" +
fracsToString(colFractions) + "]";
}
}