/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.foo.paint;
import java.awt.*;
import java.awt.event.*;
import java.util.HashMap;
import java.util.Map;
import javax.swing.*;
import org.foo.shape.SimpleShape;
import org.foo.shape.circle.Circle;
import org.foo.shape.square.Square;
import org.foo.shape.triangle.Triangle;
/**
* This class represents the main application class, which is a JFrame subclass
* that manages a toolbar of shapes and a drawing canvas. This class does not
* directly interact with the underlying OSGi framework; instead, it is injected
* with the available <tt>SimpleShape</tt> instances to eliminate any
* dependencies on the OSGi application programming interfaces.
**/
public class PaintFrame extends JFrame implements MouseListener, MouseMotionListener {
private static final long serialVersionUID = 1L;
private static final int BOX = 54;
private JToolBar m_toolbar;
private String m_selected;
private JPanel m_panel;
private ShapeComponent m_selectedComponent;
private Map m_shapes = new HashMap();
private ActionListener m_reusableActionListener = new ShapeActionListener();
/**
* Default constructor that populates the main window.
**/
public PaintFrame() {
super("PaintFrame");
m_toolbar = new JToolBar("Toolbar");
m_panel = new JPanel();
m_panel.setBackground(Color.WHITE);
m_panel.setLayout(null);
m_panel.setMinimumSize(new Dimension(400, 400));
m_panel.addMouseListener(this);
getContentPane().setLayout(new BorderLayout());
getContentPane().add(m_toolbar, BorderLayout.NORTH);
getContentPane().add(m_panel, BorderLayout.CENTER);
setSize(400, 400);
}
/**
* This method sets the currently selected shape to be used for drawing on the
* canvas.
*
* @param name The name of the shape to use for drawing on the canvas.
**/
public void selectShape(String name) {
m_selected = name;
}
/**
* Retrieves the available <tt>SimpleShape</tt> associated with the given
* name.
*
* @param name The name of the <tt>SimpleShape</tt> to retrieve.
* @return The corresponding <tt>SimpleShape</tt> instance if available or
* <tt>null</tt>.
**/
public SimpleShape getShape(String name) {
return (SimpleShape) m_shapes.get(name);
}
/**
* Injects an available <tt>SimpleShape</tt> into the drawing frame.
*
* @param name The name of the injected <tt>SimpleShape</tt>.
* @param icon The icon associated with the injected <tt>SimpleShape</tt>.
* @param shape The injected <tt>SimpleShape</tt> instance.
**/
public void addShape(SimpleShape shape) {
m_shapes.put(shape.getName(), shape);
JButton button = new JButton(shape.getIcon());
button.setActionCommand(shape.getName());
button.setToolTipText(shape.getName());
button.addActionListener(m_reusableActionListener);
if (m_selected == null) {
button.doClick();
}
m_toolbar.add(button);
m_toolbar.validate();
repaint();
}
/**
* Removes a no longer available <tt>SimpleShape</tt> from the drawing frame.
*
* @param name The name of the <tt>SimpleShape</tt> to remove.
**/
public void removeShape(String name) {
m_shapes.remove(name);
if ((m_selected != null) && m_selected.equals(name)) {
m_selected = null;
}
for (int i = 0; i < m_toolbar.getComponentCount(); i++) {
JButton sb = (JButton) m_toolbar.getComponent(i);
if (sb.getActionCommand().equals(name)) {
m_toolbar.remove(i);
m_toolbar.invalidate();
validate();
repaint();
break;
}
}
if ((m_selected == null) && (m_toolbar.getComponentCount() > 0)) {
((JButton) m_toolbar.getComponent(0)).doClick();
}
}
/**
* Implements method for the <tt>MouseListener</tt> interface to draw the
* selected shape into the drawing canvas.
*
* @param evt The associated mouse event.
**/
public void mouseClicked(MouseEvent evt) {
if (m_selected == null) {
return;
}
if (m_panel.contains(evt.getX(), evt.getY())) {
ShapeComponent sc = new ShapeComponent(this, m_selected);
sc.setBounds(evt.getX() - BOX / 2, evt.getY() - BOX / 2, BOX, BOX);
m_panel.add(sc, 0);
m_panel.validate();
m_panel.repaint(sc.getBounds());
}
}
/**
* Implements an empty method for the <tt>MouseListener</tt> interface.
*
* @param evt The associated mouse event.
**/
public void mouseEntered(MouseEvent evt) {}
/**
* Implements an empty method for the <tt>MouseListener</tt> interface.
*
* @param evt The associated mouse event.
**/
public void mouseExited(MouseEvent evt) {}
/**
* Implements method for the <tt>MouseListener</tt> interface to initiate
* shape dragging.
*
* @param evt The associated mouse event.
**/
public void mousePressed(MouseEvent evt) {
Component c = m_panel.getComponentAt(evt.getPoint());
if (c instanceof ShapeComponent) {
m_selectedComponent = (ShapeComponent) c;
m_panel.setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
m_panel.addMouseMotionListener(this);
m_selectedComponent.repaint();
}
}
/**
* Implements method for the <tt>MouseListener</tt> interface to complete
* shape dragging.
*
* @param evt The associated mouse event.
**/
public void mouseReleased(MouseEvent evt) {
if (m_selectedComponent != null) {
m_panel.removeMouseMotionListener(this);
m_panel.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
m_selectedComponent.setBounds(evt.getX() - BOX / 2, evt.getY() - BOX / 2, BOX, BOX);
m_selectedComponent.repaint();
m_selectedComponent = null;
}
}
/**
* Implements method for the <tt>MouseMotionListener</tt> interface to move a
* dragged shape.
*
* @param evt The associated mouse event.
**/
public void mouseDragged(MouseEvent evt) {
m_selectedComponent.setBounds(evt.getX() - BOX / 2, evt.getY() - BOX / 2, BOX, BOX);
}
/**
* Implements an empty method for the <tt>MouseMotionListener</tt> interface.
*
* @param evt The associated mouse event.
**/
public void mouseMoved(MouseEvent evt) {}
/**
* Simple action listener for shape tool bar buttons that sets the drawing
* frame's currently selected shape when receiving an action event.
**/
private class ShapeActionListener implements ActionListener {
public void actionPerformed(ActionEvent evt) {
selectShape(evt.getActionCommand());
}
}
/**
* This method actually performs the creation of the application window. It is
* intended to be called by the Swing event thread and should not be called
* directly.
**/
public static void main(String[] args) throws Exception {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
PaintFrame frame = new PaintFrame();
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent evt) {
System.exit(0);
}
});
frame.addShape(new Circle());
frame.addShape(new Square());
frame.addShape(new Triangle());
frame.setVisible(true);
}
});
}
}