Java examples for Swing:JSpinner
Create and use Custom SpinnerListModel
/*/*w w w .j a v a 2s . c o m*/ * This application demonstrates using spinners. * Other files required: * SpringUtilities.java * CyclingSpinnerListModel.java */ import javax.swing.*; import java.awt.Color; import java.awt.Container; import java.util.Calendar; import java.util.Date; import javax.swing.SpinnerModel; import javax.swing.SpinnerListModel; import javax.swing.*; import javax.swing.SpringLayout; import java.awt.*; /** * 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. */ 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); } } /** * This 1.4 example is used by the various SpinnerDemos. * It implements a SpinnerListModel that works only with * an Object array and that implements cycling (the next * value and previous value are never null). It also * lets you optionally associate a spinner model that's * linked to this one, so that when a cycle occurs the * linked spinner model is updated. * The SpinnerDemos use the CyclingSpinnerListModel for * a month spinner that (in SpinnerDemo3) is tied to the * year spinner, so that -- for example -- when the month * changes from December to January, the year increases. */ class CyclingSpinnerListModel extends SpinnerListModel { Object firstValue, lastValue; SpinnerModel linkedModel = null; public CyclingSpinnerListModel(Object[] values) { super(values); firstValue = values[0]; lastValue = values[values.length - 1]; } public void setLinkedModel(SpinnerModel linkedModel) { this.linkedModel = linkedModel; } public Object getNextValue() { Object value = super.getNextValue(); if (value == null) { value = firstValue; if (linkedModel != null) { linkedModel.setValue(linkedModel.getNextValue()); } } return value; } public Object getPreviousValue() { Object value = super.getPreviousValue(); if (value == null) { value = lastValue; if (linkedModel != null) { linkedModel.setValue(linkedModel.getPreviousValue()); } } return value; } } public class SpinnerDemo extends JPanel { public SpinnerDemo(boolean cycleMonths) { super(new SpringLayout()); String[] labels = { "Month: ", "Year: ", "Another Date: " }; int numPairs = labels.length; Calendar calendar = Calendar.getInstance(); JFormattedTextField ftf = null; //Add the first label-spinner pair. String[] monthStrings = getMonthStrings(); //get month names SpinnerListModel monthModel = null; if (cycleMonths) { //use custom model monthModel = new CyclingSpinnerListModel(monthStrings); } else { //use standard model monthModel = new SpinnerListModel(monthStrings); } JSpinner spinner = addLabeledSpinner(this, labels[0], monthModel); //Tweak the spinner's formatted text field. ftf = getTextField(spinner); if (ftf != null) { ftf.setColumns(8); //specify more width than we need ftf.setHorizontalAlignment(JTextField.RIGHT); } //Add second label-spinner pair. int currentYear = calendar.get(Calendar.YEAR); SpinnerModel yearModel = new SpinnerNumberModel(currentYear, //initial value currentYear - 100, //min currentYear + 100, //max 1); //step //If we're cycling, hook this model up to the month model. if (monthModel instanceof CyclingSpinnerListModel) { ((CyclingSpinnerListModel) monthModel) .setLinkedModel(yearModel); } spinner = addLabeledSpinner(this, labels[1], yearModel); //Make the year be formatted without a thousands separator. spinner.setEditor(new JSpinner.NumberEditor(spinner, "#")); //Add the third label-spinner pair. Date initDate = calendar.getTime(); calendar.add(Calendar.YEAR, -100); Date earliestDate = calendar.getTime(); calendar.add(Calendar.YEAR, 200); Date latestDate = calendar.getTime(); SpinnerModel dateModel = new SpinnerDateModel(initDate, earliestDate, latestDate, Calendar.YEAR);//ignored for user input spinner = addLabeledSpinner(this, labels[2], dateModel); spinner.setEditor(new JSpinner.DateEditor(spinner, "MM/yyyy")); //Lay out the panel. SpringUtilities.makeCompactGrid(this, numPairs, 2, //rows, cols 10, 10, //initX, initY 6, 10); //xPad, yPad } /** * Return the formatted text field used by the editor, or * null if the editor doesn't descend from JSpinner.DefaultEditor. */ public JFormattedTextField getTextField(JSpinner spinner) { JComponent editor = spinner.getEditor(); if (editor instanceof JSpinner.DefaultEditor) { return ((JSpinner.DefaultEditor) editor).getTextField(); } else { System.err.println("Unexpected editor type: " + spinner.getEditor().getClass() + " isn't a descendant of DefaultEditor"); return null; } } /** * DateFormatSymbols returns an extra, empty value at the * end of the array of months. Remove it. */ static protected String[] getMonthStrings() { String[] months = new java.text.DateFormatSymbols().getMonths(); int lastIndex = months.length - 1; if (months[lastIndex] == null || months[lastIndex].length() <= 0) { //last item empty String[] monthStrings = new String[lastIndex]; System.arraycopy(months, 0, monthStrings, 0, lastIndex); return monthStrings; } else { //last item not empty return months; } } static protected JSpinner addLabeledSpinner(Container c, String label, SpinnerModel model) { JLabel l = new JLabel(label); c.add(l); JSpinner spinner = new JSpinner(model); l.setLabelFor(spinner); c.add(spinner); return spinner; } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event-dispatching thread. */ private static void createAndShowGUI() { //Create and set up the window. JFrame frame = new JFrame("SpinnerDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. JComponent newContentPane = new SpinnerDemo(false); newContentPane.setOpaque(true); //content panes must be opaque frame.setContentPane(newContentPane); //Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } } /* * Copyright (c) 1995, 2008, Oracle and/or its affiliates. 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