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Table Layout implements LayoutManager2
/* Copyright (c) 2006, 2009, Carl Burch. License information is located in the
* com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.LayoutManager2;
import java.util.ArrayList;
public class TableLayout implements LayoutManager2 {
private int colCount;
private ArrayList contents; // of Component[]
private int curRow;
private int curCol;
private Dimension prefs;
private int[] prefRow;
private int[] prefCol;
private double[] rowWeight;
public TableLayout(int colCount) {
this.colCount = colCount;
this.contents = new ArrayList();
this.curRow = 0;
this.curCol = 0;
}
public void setRowWeight(int rowIndex, double weight) {
if(weight < 0) {
throw new IllegalArgumentException("weight must be nonnegative");
}
if(rowIndex < 0) {
throw new IllegalArgumentException("row index must be nonnegative");
}
if((rowWeight == null || rowIndex >= rowWeight.length) && weight != 0.0) {
double[] a = new double[rowIndex + 10];
if(rowWeight != null) System.arraycopy(rowWeight, 0, a, 0, rowWeight.length);
rowWeight = a;
}
rowWeight[rowIndex] = weight;
}
public void addLayoutComponent(String name, Component comp) {
while(curRow >= contents.size()) {
contents.add(new Component[colCount]);
}
Component[] rowContents = (Component[]) contents.get(curRow);
rowContents[curCol] = comp;
++curCol;
if(curCol == colCount) {
++curRow;
curCol = 0;
}
prefs = null;
}
public void addLayoutComponent(Component comp, Object constraints) {
if(constraints instanceof TableConstraints) {
TableConstraints con = (TableConstraints) constraints;
if(con.getRow() >= 0) curRow = con.getRow();
if(con.getCol() >= 0) curCol = con.getCol();
}
addLayoutComponent("", comp);
}
public void removeLayoutComponent(Component comp) {
for(int i = 0, n = contents.size(); i < n; i++) {
Component[] row = (Component[]) contents.get(i);
for(int j = 0; j < row.length; j++) {
if(row[j] == comp) {
row[j] = null;
return;
}
}
}
prefs = null;
}
public Dimension preferredLayoutSize(Container parent) {
if(prefs == null) {
int[] prefCol = new int[colCount];
int[] prefRow = new int[contents.size()];
int height = 0;
for(int i = 0; i < prefRow.length; i++) {
Component[] row = (Component[]) contents.get(i);
int rowHeight = 0;
for(int j = 0; j < row.length; j++) {
if(row[j] != null) {
Dimension dim = row[j].getPreferredSize();
if(dim.height > rowHeight) rowHeight = dim.height;
if(dim.width > prefCol[j]) prefCol[j] = dim.width;
}
}
prefRow[i] = rowHeight;
height += rowHeight;
}
int width = 0;
for(int i = 0; i < prefCol.length; i++) {
width += prefCol[i];
}
this.prefs = new Dimension(width, height);
this.prefRow = prefRow;
this.prefCol = prefCol;
}
return new Dimension(prefs);
}
public Dimension minimumLayoutSize(Container parent) {
return preferredLayoutSize(parent);
}
public Dimension maximumLayoutSize(Container parent) {
return new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);
}
public float getLayoutAlignmentX(Container parent) {
return 0.5f;
}
public float getLayoutAlignmentY(Container parent) {
return 0.5f;
}
public void layoutContainer(Container parent) {
Dimension pref = preferredLayoutSize(parent);
int[] prefRow = this.prefRow;
int[] prefCol = this.prefCol;
Dimension size = parent.getSize();
double y0;
int yRemaining = size.height - pref.height;
double rowWeightTotal = 0.0;
if(yRemaining != 0 && rowWeight != null) {
for(int i = 0; i < rowWeight.length; i++) {
rowWeightTotal += rowWeight[i];
}
}
if(rowWeightTotal == 0.0 && yRemaining > 0) {
y0 = yRemaining / 2.0;
} else {
y0 = 0;
}
int x0 = (size.width - pref.width) / 2;
if(x0 < 0) x0 = 0;
double y = y0;
for(int i = 0, n = contents.size(); i < n; i++) {
Component[] row = (Component[]) contents.get(i);
int yRound = (int) (y + 0.5);
int x = x0;
for(int j = 0; j < row.length; j++) {
Component comp = row[j];
if(comp != null) {
row[j].setBounds(x, yRound, prefCol[j], prefRow[i]);
}
x += prefCol[j];
}
y += prefRow[i];
if(rowWeightTotal > 0 && i < rowWeight.length) {
y += yRemaining * rowWeight[i] / rowWeightTotal;
}
}
// TODO Auto-generated method stub
}
public void invalidateLayout(Container parent) {
prefs = null;
}
}
/* Copyright (c) 2006, 2009, Carl Burch. License information is located in the
* com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */
class TableConstraints {
public static TableConstraints at(int row, int col) {
return new TableConstraints(row, col);
}
private int col;
private int row;
private TableConstraints(int row, int col) {
this.col = col;
this.row = row;
}
int getRow() {
return row;
}
int getCol() {
return col;
}
}
