package se.perfectfools.localizer.gui;
   
   import java.awt.Component;
   import java.awt.Container;
   
   import javax.swing.Spring;
   import javax.swing.SpringLayout;
   
   /***
   * A 1.4 file that provides utility methods for creating form- or grid-style
   * layouts with SpringLayout. These utilities are used by several programs, such
   * as SpringBox and SpringCompactGrid.
   */
  public class SpringUtilities {
  	/***
  	 * A debugging utility that prints to stdout the component's minimum,
  	 * preferred, and maximum sizes.
  	 */
  	public static void printSizes(Component c) {
  		System.out.println("minimumSize = " + c.getMinimumSize());
  		System.out.println("preferredSize = " + c.getPreferredSize());
  		System.out.println("maximumSize = " + c.getMaximumSize());
  	}
  
  	/***
  	 * Aligns the first <code>rows</code>*<code>cols</code> components of
  	 * <code>parent</code> in a grid. Each component is as big as the maximum
  	 * preferred width and height of the components. The parent is made just big
  	 * enough to fit them all.
  	 * 
  	 * @param rows
  	 *            number of rows
  	 * @param cols
  	 *            number of columns
  	 * @param initialX
  	 *            x location to start the grid at
  	 * @param initialY
  	 *            y location to start the grid at
  	 * @param xPad
  	 *            x padding between cells
  	 * @param yPad
  	 *            y padding between cells
  	 */
  	public static void makeGrid(Container parent, int rows, int cols,
  			int initialX, int initialY, int xPad, int yPad) {
  		SpringLayout layout;
  		try {
  			layout = (SpringLayout) parent.getLayout();
  		} catch (ClassCastException exc) {
  			System.err
  					.println("The first argument to makeGrid must use SpringLayout.");
  			return;
  		}
  
  		Spring xPadSpring = Spring.constant(xPad);
  		Spring yPadSpring = Spring.constant(yPad);
  		Spring initialXSpring = Spring.constant(initialX);
  		Spring initialYSpring = Spring.constant(initialY);
  		int max = rows * cols;
  
  		//Calculate Springs that are the max of the width/height so that all
  		//cells have the same size.
  		Spring maxWidthSpring = layout.getConstraints(parent.getComponent(0))
  				.getWidth();
  		Spring maxHeightSpring = layout.getConstraints(parent.getComponent(0))
  				.getWidth();
  		for (int i = 1; i < max; i++) {
  			SpringLayout.Constraints cons = layout.getConstraints(parent
  					.getComponent(i));
  
  			maxWidthSpring = Spring.max(maxWidthSpring, cons.getWidth());
  			maxHeightSpring = Spring.max(maxHeightSpring, cons.getHeight());
  		}
  
  		//Apply the new width/height Spring. This forces all the
  		//components to have the same size.
  		for (int i = 0; i < max; i++) {
  			SpringLayout.Constraints cons = layout.getConstraints(parent
  					.getComponent(i));
  
  			cons.setWidth(maxWidthSpring);
  			cons.setHeight(maxHeightSpring);
  		}
  
  		//Then adjust the x/y constraints of all the cells so that they
  		//are aligned in a grid.
  		SpringLayout.Constraints lastCons = null;
  		SpringLayout.Constraints lastRowCons = null;
  		for (int i = 0; i < max; i++) {
  			SpringLayout.Constraints cons = layout.getConstraints(parent
  					.getComponent(i));
  			if (i % cols == 0) { //start of new row
  				lastRowCons = lastCons;
  				cons.setX(initialXSpring);
  			} else { //x position depends on previous component
  				cons.setX(Spring.sum(lastCons.getConstraint(SpringLayout.EAST),
  						xPadSpring));
  			}
  
 			if (i / cols == 0) { //first row
 				cons.setY(initialYSpring);
 			} else { //y position depends on previous row
 				cons.setY(Spring.sum(lastRowCons
 						.getConstraint(SpringLayout.SOUTH), yPadSpring));
 			}
 			lastCons = cons;
 		}
 
 		//Set the parent's size.
 		SpringLayout.Constraints pCons = layout.getConstraints(parent);
 		pCons.setConstraint(SpringLayout.SOUTH, Spring.sum(Spring
 				.constant(yPad), lastCons.getConstraint(SpringLayout.SOUTH)));
 		pCons.setConstraint(SpringLayout.EAST, Spring.sum(
 				Spring.constant(xPad), lastCons
 						.getConstraint(SpringLayout.EAST)));
 	}
 
 	/* Used by makeCompactGrid. */
 	private static SpringLayout.Constraints getConstraintsForCell(int row,
 			int col, Container parent, int cols) {
 		SpringLayout layout = (SpringLayout) parent.getLayout();
 		Component c = parent.getComponent(row * cols + col);
 		return layout.getConstraints(c);
 	}
 
 	/***
 	 * Aligns the first <code>rows</code>*<code>cols</code> components of
 	 * <code>parent</code> in a grid. Each component in a column is as wide as
 	 * the maximum preferred width of the components in that column; height is
 	 * similarly determined for each row. The parent is made just big enough to
 	 * fit them all.
 	 * 
 	 * @param rows
 	 *            number of rows
 	 * @param cols
 	 *            number of columns
 	 * @param initialX
 	 *            x location to start the grid at
 	 * @param initialY
 	 *            y location to start the grid at
 	 * @param xPad
 	 *            x padding between cells
 	 * @param yPad
 	 *            y padding between cells
 	 */
 	public static void makeCompactGrid(Container parent, int rows, int cols,
 			int initialX, int initialY, int xPad, int yPad) {
 		SpringLayout layout;
 		try {
 			layout = (SpringLayout) parent.getLayout();
 		} catch (ClassCastException exc) {
 			System.err
 					.println("The first argument to makeCompactGrid must use SpringLayout.");
 			return;
 		}
 
 		//Align all cells in each column and make them the same width.
 		Spring x = Spring.constant(initialX);
 		for (int c = 0; c < cols; c++) {
 			Spring width = Spring.constant(0);
 			for (int r = 0; r < rows; r++) {
 				width = Spring.max(width, getConstraintsForCell(r, c, parent,
 						cols).getWidth());
 			}
 			for (int r = 0; r < rows; r++) {
 				SpringLayout.Constraints constraints = getConstraintsForCell(r,
 						c, parent, cols);
 				constraints.setX(x);
 				constraints.setWidth(width);
 			}
 			x = Spring.sum(x, Spring.sum(width, Spring.constant(xPad)));
 		}
 
 		//Align all cells in each row and make them the same height.
 		Spring y = Spring.constant(initialY);
 		for (int r = 0; r < rows; r++) {
 			Spring height = Spring.constant(0);
 			for (int c = 0; c < cols; c++) {
 				height = Spring.max(height, getConstraintsForCell(r, c, parent,
 						cols).getHeight());
 			}
 			for (int c = 0; c < cols; c++) {
 				SpringLayout.Constraints constraints = getConstraintsForCell(r,
 						c, parent, cols);
 				constraints.setY(y);
 				constraints.setHeight(height);
 			}
 			y = Spring.sum(y, Spring.sum(height, Spring.constant(yPad)));
 		}
 
 		//Set the parent's size.
 		SpringLayout.Constraints pCons = layout.getConstraints(parent);
 		pCons.setConstraint(SpringLayout.SOUTH, y);
 		pCons.setConstraint(SpringLayout.EAST, x);
 	}
 }