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package javax.swing.colorchooser;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.text.*;
import java.io.Serializable;


A better GridLayout class
Author:Steve Wilson
/** * A better GridLayout class * * @author Steve Wilson */
@SuppressWarnings("serial") // Same-version serialization only class SmartGridLayout implements LayoutManager, Serializable { int rows = 2; int columns = 2; int xGap = 2; int yGap = 2; int componentCount = 0; Component[][] layoutGrid; public SmartGridLayout(int numColumns, int numRows) { rows = numRows; columns = numColumns; layoutGrid = new Component[numColumns][numRows]; } public void layoutContainer(Container c) { buildLayoutGrid(c); int[] rowHeights = new int[rows]; int[] columnWidths = new int[columns]; for (int row = 0; row < rows; row++) { rowHeights[row] = computeRowHeight(row); } for (int column = 0; column < columns; column++) { columnWidths[column] = computeColumnWidth(column); } Insets insets = c.getInsets(); if (c.getComponentOrientation().isLeftToRight()) { int horizLoc = insets.left; for (int column = 0; column < columns; column++) { int vertLoc = insets.top; for (int row = 0; row < rows; row++) { Component current = layoutGrid[column][row]; current.setBounds(horizLoc, vertLoc, columnWidths[column], rowHeights[row]); // System.out.println(current.getBounds()); vertLoc += (rowHeights[row] + yGap); } horizLoc += (columnWidths[column] + xGap ); } } else { int horizLoc = c.getWidth() - insets.right; for (int column = 0; column < columns; column++) { int vertLoc = insets.top; horizLoc -= columnWidths[column]; for (int row = 0; row < rows; row++) { Component current = layoutGrid[column][row]; current.setBounds(horizLoc, vertLoc, columnWidths[column], rowHeights[row]); // System.out.println(current.getBounds()); vertLoc += (rowHeights[row] + yGap); } horizLoc -= xGap; } } } public Dimension minimumLayoutSize(Container c) { buildLayoutGrid(c); Insets insets = c.getInsets(); int height = 0; int width = 0; for (int row = 0; row < rows; row++) { height += computeRowHeight(row); } for (int column = 0; column < columns; column++) { width += computeColumnWidth(column); } height += (yGap * (rows - 1)) + insets.top + insets.bottom; width += (xGap * (columns - 1)) + insets.right + insets.left; return new Dimension(width, height); } public Dimension preferredLayoutSize(Container c) { return minimumLayoutSize(c); } public void addLayoutComponent(String s, Component c) {} public void removeLayoutComponent(Component c) {} private void buildLayoutGrid(Container c) { Component[] children = c.getComponents(); for (int componentCount = 0; componentCount < children.length; componentCount++) { // System.out.println("Children: " +componentCount); int row = 0; int column = 0; if (componentCount != 0) { column = componentCount % columns; row = (componentCount - column) / columns; } // System.out.println("inserting into: "+ column + " " + row); layoutGrid[column][row] = children[componentCount]; } } private int computeColumnWidth(int columnNum) { int maxWidth = 1; for (int row = 0; row < rows; row++) { int width = layoutGrid[columnNum][row].getPreferredSize().width; if (width > maxWidth) { maxWidth = width; } } return maxWidth; } private int computeRowHeight(int rowNum) { int maxHeight = 1; for (int column = 0; column < columns; column++) { int height = layoutGrid[column][rowNum].getPreferredSize().height; if (height > maxHeight) { maxHeight = height; } } return maxHeight; } }