public Dimension preferredLayoutSize(Container parent) {
Insets insets = parent.insets();
int ncomponents = parent.countComponents();
int nrows = getRows();
int ncols = getColumns();
int hgap = getHgap();
int vgap = getVgap();
if (nrows > 0) {
ncols = (ncomponents + nrows - 1) / nrows;
} else {
nrows = (ncomponents + ncols - 1) / ncols;
}
int nComps = parent.getComponentCount();
int y = insets.top;
for (int row = 0; row < nrows; row++) {
int h = 0;
for (int col = 0; col < ncols; col++) {
if (row * ncols + col < nComps) {
Component c = parent.getComponent(row * ncols + col);
h = Math.max(h, c.getMinimumSize().height);
}
}
y += h + vgap;
}
int x = insets.left;
for (int col = 0; col < ncols; col++) {
int w = 0;
for (int row = 0; row < nrows; row++) {
if (row * ncols + col < nComps) {
Component c = parent.getComponent(row * ncols + col);
w = Math.max(w, c.getMinimumSize().width);
}
}
x += w + hgap;
}
return new Dimension(x, y);
}
public void layoutContainer(Container parent) {
Insets insets = parent.insets();
int ncomponents = parent.countComponents();
int nrows = getRows();
int ncols = getColumns();
int hgap = getHgap();
int vgap = getVgap();
if (nrows > 0) {
ncols = (ncomponents + nrows - 1) / nrows;
} else {
nrows = (ncomponents + ncols - 1) / ncols;
}
// Set heights
int x;
int y;
int nFills = 0;
boolean[] fills = new boolean[nrows];
int lastFillRow = -1;
int nComps = parent.getComponentCount();
y = insets.top;
for (int row = 0; row < nrows; row++) {
// Find largest minimum height for this row
int h = 0;
for (int col = 0; col < ncols; col++) {
if (row * ncols + col < nComps) {
Component c = parent.getComponent(row * ncols + col);
h = Math.max(h, c.getMinimumSize().height);
}
}
// Set heights for this row
x = insets.left;
for (int col = 0; col < ncols; col++) {
if (row * ncols + col < nComps) {
JComponent c = (JComponent) parent.getComponent(row * ncols + col);
int w = c.getWidth();
c.setBounds(x, y, w, h);
x += w + hgap;
if (col == 0 && getFillRow(c)) {
fills[row] = true;
}
}
}
y += h + vgap;
if (fills[row]) {
nFills++;
lastFillRow = row;
}
}
// Fill heights
if (nFills > 0 && y < parent.getHeight()) {
// How much height to add
int hAdd = (parent.getHeight() - y) / nFills;
int hAdded = 0;
for (int row = 0; row < nrows; row++) {
if (fills[row]) {
if (row == lastFillRow) {
// Compensate for rounding error
hAdd = parent.getHeight() - (y + hAdded);
}
for (int col = 0; col < ncols; col++) {
if (row * ncols + col < nComps) {
Component c = parent.getComponent(row * ncols + col);
Rectangle b = c.getBounds();
c.setBounds(b.x, b.y + hAdded, b.width, b.height + hAdd);
}
}
hAdded += hAdd;
}
}
}
// Set widths
nFills = 0;
fills = new boolean[ncols];
int lastFillCol = -1;
x = insets.left;
for (int col = 0; col < ncols; col++) {
// Find largest minimum width for this column
int w = 0;
for (int row = 0; row < nrows; row++) {
if (row * ncols + col < nComps) {
Component c = parent.getComponent(row * ncols + col);
w = Math.max(w, c.getMinimumSize().width);
}
}
// Set widths for this column
y = insets.top;
for (int row = 0; row < nrows; row++) {
if (row * ncols + col < nComps) {
JComponent c = (JComponent) parent.getComponent(row * ncols + col);
int h = c.getHeight();
c.setBounds(x, y, w, h);
y += h + vgap;
if (row == 0 && getFillColumn(c)) {
fills[col] = true;
}
}
}
x += w + hgap;
if (fills[col]) {
nFills++;
lastFillCol = col;
}
}
// Fill widths
if (nFills > 0 && x < parent.getWidth()) {
// How much width to add
int wAdd = (parent.getWidth() - x) / nFills;
int wAdded = 0;
for (int col = 0; col < ncols; col++) {
if (fills[col]) {
if (col == lastFillCol) {
wAdd = parent.getWidth() - (x + wAdded);
}
for (int row = 0; row < nrows; row++) {
if (row * ncols + col < nComps) {
Component c = parent.getComponent(row * ncols + col);
Rectangle b = c.getBounds();
c.setBounds(b.x + wAdded, b.y, b.width + wAdd, b.height);
}
}
wAdded += wAdd;
}
}
}
}