Java tutorial
/*
* Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle,
* Santa Clara, California 95054, U.S.A. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.AffineTransform;
import java.awt.geom.NoninvertibleTransformException;
import java.awt.geom.Point2D;
import java.util.Map;
import java.util.HashMap;
/**
* Container which can transform its children, for example:<br>
* <pre>
* JButton button = new JButton("Hello");
* JXTransformer t = new JXTransformer(button);
* t.rotate(Math.PI/2);</pre>
*
* <strong>Note:</strong>
* This component was designed to transform simple components
* like JButton, JLabel etc.
*
* @author Alexander Potochkin
*
* https://swinghelper.dev.java.net/
* http://weblogs.java.net/blog/alexfromsun/
*/
public class JXTransformer extends JPanel {
private Component glassPane = new MagicGlassPane();
private Component view;
private Rectangle visibleRect;
private Map<?,?> renderingHints;
private AffineTransform at;
public JXTransformer() {
this(null);
}
public JXTransformer(JComponent view) {
this(view, new AffineTransform());
}
public JXTransformer(JComponent view, AffineTransform at) {
super(null);
setTransform(at);
super.addImpl(glassPane, null, 0);
setView(view);
Handler handler = new Handler();
addHierarchyBoundsListener(handler);
addComponentListener(handler);
}
public Component getView() {
return view;
}
public void setView(Component view) {
if (getView() != null) {
super.remove(getView());
}
if (view != null) {
super.addImpl(view, null, 1);
}
this.view = view;
doLayout();
revalidate();
repaint();
}
public Map<?,?> getRenderingHints() {
if (renderingHints == null) {
return null;
}
return new HashMap<Object,Object>(renderingHints);
}
public void setRenderingHints(Map<?,?> renderingHints) {
if (renderingHints == null) {
this.renderingHints = null;
} else {
this.renderingHints = new HashMap<Object,Object>(renderingHints);
}
repaint();
}
protected void addImpl(Component comp, Object constraints, int index) {
setView(comp);
}
public void remove(int index) {
Component c = getComponent(index);
if (c == view) {
view = null;
super.remove(index);
} else if (c == glassPane) {
throw new IllegalArgumentException("GlassPane can't be removed");
} else {
throw new AssertionError("Unknown component with index " + index);
}
}
public void removeAll() {
remove(view);
}
//This is important
public boolean isOptimizedDrawingEnabled() {
return false;
}
public void setLayout(LayoutManager mgr) {
if (mgr != null) {
throw new IllegalArgumentException("Only null layout is supported");
}
super.setLayout(mgr);
}
public void doLayout() {
if (view != null) {
view.setSize(view.getPreferredSize());
visibleRect = getVisibleRect();
view.setLocation(visibleRect.x, visibleRect.y);
}
glassPane.setLocation(0, 0);
glassPane.setSize(getWidth(), getHeight());
}
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
Dimension size = getTransformedSize().getSize();
Insets insets = getInsets();
size.width += insets.left + insets.right;
size.height += insets.top + insets.bottom;
return size;
}
private Rectangle getTransformedSize() {
if (view != null) {
Dimension viewSize = view.getSize();
Rectangle viewRect = new Rectangle(viewSize);
return at.createTransformedShape(viewRect).getBounds();
}
return new Rectangle(super.getPreferredSize());
}
public void paint(Graphics g) {
//repaint the whole transformer in case the view component was repainted
Rectangle clipBounds = g.getClipBounds();
if (clipBounds != null && !clipBounds.equals(visibleRect)) {
repaint();
}
//clear the background
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
if (view != null && at.getDeterminant() != 0) {
Graphics2D g2 = (Graphics2D) g.create();
Insets insets = getInsets();
Rectangle bounds = getBounds();
//don't forget about insets
bounds.x += insets.left;
bounds.y += insets.top;
bounds.width -= insets.left + insets.right;
bounds.height -= insets.top + insets.bottom;
double centerX1 = bounds.getCenterX();
double centerY1 = bounds.getCenterY();
Rectangle tb = getTransformedSize();
double centerX2 = tb.getCenterX();
double centerY2 = tb.getCenterY();
//set antialiasing by default
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
if (renderingHints != null) {
g2.addRenderingHints(renderingHints);
}
//translate it to the center of the view component again
double tx = centerX1 - centerX2 - getX();
double ty = centerY1 - centerY2 - getY();
g2.translate((int) tx, (int) ty);
g2.transform(at);
view.paint(g2);
g2.dispose();
}
//paint the border
paintBorder(g);
}
private class MagicGlassPane extends JPanel {
private Component mouseEnteredComponent;
private Component mouseDraggedComponent;
private Component mouseCurrentComponent;
public MagicGlassPane() {
super(null);
setOpaque(false);
enableEvents(AWTEvent.MOUSE_EVENT_MASK);
enableEvents(AWTEvent.MOUSE_MOTION_EVENT_MASK);
enableEvents(AWTEvent.MOUSE_WHEEL_EVENT_MASK);
ToolTipManager.sharedInstance().registerComponent(this);
}
private MouseEvent transformMouseEvent(MouseEvent event) {
if (event == null) {
throw new IllegalArgumentException("MouseEvent is null");
}
MouseEvent newEvent;
if (event instanceof MouseWheelEvent) {
MouseWheelEvent mouseWheelEvent = (MouseWheelEvent) event;
newEvent = new MouseWheelEvent(mouseWheelEvent.getComponent(), mouseWheelEvent.getID(),
mouseWheelEvent.getWhen(), mouseWheelEvent.getModifiers(),
mouseWheelEvent.getX(), mouseWheelEvent.getY(),
mouseWheelEvent.getClickCount(), mouseWheelEvent.isPopupTrigger(),
mouseWheelEvent.getScrollType(), mouseWheelEvent.getScrollAmount(),
mouseWheelEvent.getWheelRotation());
} else {
newEvent = new MouseEvent(event.getComponent(), event.getID(),
event.getWhen(), event.getModifiers(),
event.getX(), event.getY(),
event.getClickCount(), event.isPopupTrigger(), event.getButton());
}
if (view != null && at.getDeterminant() != 0) {
Rectangle viewBounds = getTransformedSize();
Insets insets = JXTransformer.this.getInsets();
int xgap = (getWidth() - (viewBounds.width + insets.left + insets.right)) / 2;
int ygap = (getHeight() - (viewBounds.height + insets.top + insets.bottom)) / 2;
double x = newEvent.getX() + viewBounds.getX() - insets.left;
double y = newEvent.getY() + viewBounds.getY() - insets.top;
Point2D p = new Point2D.Double(x - xgap, y - ygap);
Point2D tp;
try {
tp = at.inverseTransform(p, null);
} catch (NoninvertibleTransformException ex) {
//can't happen, we check it before
throw new AssertionError("NoninvertibleTransformException");
}
//Use transformed coordinates to get the current component
mouseCurrentComponent =
SwingUtilities.getDeepestComponentAt(view, (int) tp.getX(), (int) tp.getY());
if (mouseCurrentComponent == null) {
mouseCurrentComponent = JXTransformer.this;
}
Component tempComponent = mouseCurrentComponent;
if (mouseDraggedComponent != null) {
tempComponent = mouseDraggedComponent;
}
Point point = SwingUtilities.convertPoint(view, (int) tp.getX(), (int) tp.getY(), tempComponent);
newEvent.setSource(tempComponent);
newEvent.translatePoint(point.x - event.getX(), point.y - event.getY());
}
return newEvent;
}
protected void processMouseEvent(MouseEvent e) {
MouseEvent transformedEvent = transformMouseEvent(e);
switch (e.getID()) {
case MouseEvent.MOUSE_ENTERED:
if (mouseDraggedComponent == null || mouseCurrentComponent == mouseDraggedComponent) {
dispatchMouseEvent(transformedEvent);
}
break;
case MouseEvent.MOUSE_EXITED:
if (mouseEnteredComponent != null) {
dispatchMouseEvent(createEnterExitEvent(mouseEnteredComponent, MouseEvent.MOUSE_EXITED, e));
mouseEnteredComponent = null;
}
break;
case MouseEvent.MOUSE_RELEASED:
if (mouseDraggedComponent != null && e.getButton() == MouseEvent.BUTTON1) {
transformedEvent.setSource(mouseDraggedComponent);
mouseDraggedComponent = null;
}
dispatchMouseEvent(transformedEvent);
break;
default:
dispatchMouseEvent(transformedEvent);
}
super.processMouseEvent(e);
}
private void dispatchMouseEvent(MouseEvent event) {
MouseListener[] mouseListeners =
event.getComponent().getMouseListeners();
for (MouseListener listener : mouseListeners) {
//skip all ToolTipManager's related listeners
if (!listener.getClass().getName().startsWith("javax.swing.ToolTipManager")) {
switch (event.getID()) {
case MouseEvent.MOUSE_PRESSED:
listener.mousePressed(event);
break;
case MouseEvent.MOUSE_RELEASED:
listener.mouseReleased(event);
break;
case MouseEvent.MOUSE_CLICKED:
listener.mouseClicked(event);
break;
case MouseEvent.MOUSE_EXITED:
listener.mouseExited(event);
break;
case MouseEvent.MOUSE_ENTERED:
listener.mouseEntered(event);
break;
default:
throw new AssertionError();
}
}
}
}
protected void processMouseMotionEvent(MouseEvent e) {
MouseEvent transformedEvent = transformMouseEvent(e);
if (mouseEnteredComponent == null) {
mouseEnteredComponent = mouseCurrentComponent;
}
switch (e.getID()) {
case MouseEvent.MOUSE_MOVED:
if (mouseCurrentComponent != mouseEnteredComponent) {
dispatchMouseEvent(createEnterExitEvent(mouseEnteredComponent, MouseEvent.MOUSE_EXITED, e));
dispatchMouseEvent(createEnterExitEvent(mouseCurrentComponent, MouseEvent.MOUSE_ENTERED, e));
}
break;
case MouseEvent.MOUSE_DRAGGED:
if (mouseDraggedComponent == null) {
mouseDraggedComponent = mouseEnteredComponent;
}
if (mouseEnteredComponent == mouseDraggedComponent && mouseCurrentComponent != mouseDraggedComponent) {
dispatchMouseEvent(createEnterExitEvent(mouseDraggedComponent, MouseEvent.MOUSE_EXITED, e));
} else if (mouseEnteredComponent != mouseDraggedComponent && mouseCurrentComponent == mouseDraggedComponent) {
dispatchMouseEvent(createEnterExitEvent(mouseDraggedComponent, MouseEvent.MOUSE_ENTERED, e));
}
if (mouseDraggedComponent != null) {
transformedEvent.setSource(mouseDraggedComponent);
}
break;
}
mouseEnteredComponent = mouseCurrentComponent;
//dispatch MouseMotionEvent
MouseMotionListener[] mouseMotionListeners =
transformedEvent.getComponent().getMouseMotionListeners();
for (MouseMotionListener listener : mouseMotionListeners) {
//skip all ToolTipManager's related listeners
if (!listener.getClass().getName().startsWith("javax.swing.ToolTipManager")) {
switch (transformedEvent.getID()) {
case MouseEvent.MOUSE_MOVED:
listener.mouseMoved(transformedEvent);
break;
case MouseEvent.MOUSE_DRAGGED:
listener.mouseDragged(transformedEvent);
break;
default:
throw new AssertionError();
}
}
}
super.processMouseMotionEvent(e);
}
protected void processMouseWheelEvent(MouseWheelEvent e) {
MouseWheelEvent transformedEvent = (MouseWheelEvent) transformMouseEvent(e);
MouseWheelListener[] mouseWheelListeners =
transformedEvent.getComponent().getMouseWheelListeners();
for (MouseWheelListener listener : mouseWheelListeners) {
listener.mouseWheelMoved(transformedEvent);
}
super.processMouseWheelEvent(e);
}
public String getToolTipText(MouseEvent event) {
if (mouseEnteredComponent instanceof JComponent) {
return ((JComponent) mouseEnteredComponent).getToolTipText();
}
return null;
}
private MouseEvent createEnterExitEvent(Component c, int eventId, MouseEvent mouseEvent) {
return new MouseEvent(c, eventId, mouseEvent.getWhen(), 0,
mouseEvent.getX(), mouseEvent.getY(), 0,
false, MouseEvent.NOBUTTON);
}
public String toString() {
return "GlassPane";
}
}
/**
* This class helps view component to be in the visible area;
* this is important when transformer is inside JScrollPane
*/
private class Handler extends ComponentAdapter implements HierarchyBoundsListener {
public void componentMoved(ComponentEvent e) {
update();
}
public void ancestorMoved(HierarchyEvent e) {
update();
}
public void ancestorResized(HierarchyEvent e) {
update();
}
private void update() {
if (!getVisibleRect().equals(visibleRect)) {
revalidate();
}
}
}
/**
* Never returns null
*/
public AffineTransform getTransform() {
return new AffineTransform(at);
}
public void setTransform(AffineTransform at) {
if (at == null) {
throw new IllegalArgumentException("AffineTransform is null");
}
this.at = new AffineTransform(at);
revalidate();
repaint();
}
public void rotate(double theta) {
AffineTransform transform = getTransform();
transform.rotate(theta);
setTransform(transform);
}
public void scale(double sx, double sy) {
AffineTransform transform = getTransform();
transform.scale(sx, sy);
setTransform(transform);
}
public void shear(double sx, double sy) {
AffineTransform transform = getTransform();
transform.shear(sx, sy);
setTransform(transform);
}
}
/////////////
/*
* Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle,
* Santa Clara, California 95054, U.S.A. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
import javax.swing.*;
import javax.swing.border.TitledBorder;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.AffineTransform;
import java.util.ArrayList;
import java.util.List;
import java.util.Vector;
/*
* @author Alexander Potochkin
*
* https://swinghelper.dev.java.net/
* http://weblogs.java.net/blog/alexfromsun/
*/
class TransformerDemo extends JFrame implements ChangeListener {
private List<JXTransformer> transformers = new ArrayList<JXTransformer>();
private JSlider rotationSlider;
private JSlider scalingSlider;
private JSlider shearingSlider;
public TransformerDemo() {
super("Transformer demo");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JMenuBar bar = new JMenuBar();
JMenu lafMenu = new JMenu("LaF");
JMenuItem winLaf = new JMenuItem("Windows LaF");
lafMenu.add(winLaf);
winLaf.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setLaf("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
}
});
JMenuItem motifLaf = new JMenuItem("Motif LaF");
lafMenu.add(motifLaf);
motifLaf.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setLaf("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
}
});
bar.add(lafMenu);
JMenuItem metalLaf = new JMenuItem("Metal LaF");
lafMenu.add(metalLaf);
metalLaf.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setLaf("javax.swing.plaf.metal.MetalLookAndFeel");
}
});
JMenu settingsMenu = new JMenu("Settings");
settingsMenu.setMnemonic(KeyEvent.VK_S);
JMenuItem item = new JMenuItem("Reset sliders", KeyEvent.VK_R);
item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_R, InputEvent.ALT_MASK));
item.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
rotationSlider.setValue(0);
scalingSlider.setValue(100);
shearingSlider.setValue(0);
}
});
settingsMenu.add(item);
bar.add(settingsMenu);
setJMenuBar(bar);
JPanel panel = new JPanel(new BorderLayout());
panel.add(createDemoPanel());
panel.add(createStressTestPanel(), BorderLayout.EAST);
add(new JScrollPane(panel));
add(new JScrollPane(createToolPanel()), BorderLayout.SOUTH);
pack();
}
private void setLaf(String laf) {
try {
UIManager.setLookAndFeel(laf);
SwingUtilities.updateComponentTreeUI(this);
} catch (Exception e) {
e.printStackTrace();
}
for (JXTransformer t : transformers) {
t.revalidate();
t.repaint();
}
}
private JPanel createStressTestPanel() {
JPanel panel = new JPanel();
TitledBorder titledBorder = BorderFactory.createTitledBorder("Stress test (with tooltips)");
titledBorder.setTitleJustification(TitledBorder.CENTER);
panel.setBorder(titledBorder);
JButton lowerButton = new JButton("Button");
lowerButton.setLayout(new FlowLayout());
lowerButton.setToolTipText("Lower button");
JButton middleButton = new JButton();
middleButton.setToolTipText("Middle button");
middleButton.setLayout(new FlowLayout());
lowerButton.add(middleButton);
JButton upperButton = new JButton("Upper button");
upperButton.setToolTipText("Upper button");
middleButton.add(upperButton);
panel.add(createTransformer(lowerButton));
return panel;
}
private JPanel createDemoPanel() {
JPanel buttonPanel = new JPanel(new GridLayout(3, 2));
TitledBorder titledBorder = BorderFactory.createTitledBorder("Try three sliders below !");
Font titleFont = titledBorder.getTitleFont();
titledBorder.setTitleFont(titleFont.deriveFont(titleFont.getSize2D() + 10));
titledBorder.setTitleJustification(TitledBorder.CENTER);
buttonPanel.setBorder(titledBorder);
JButton b = new JButton("JButton");
b.setPreferredSize(new Dimension(100, 50));
buttonPanel.add(createTransformer(b));
Vector<String> v = new Vector<String>();
v.add("One");
v.add("Two");
v.add("Three");
JList list = new JList(v);
buttonPanel.add(createTransformer(list));
buttonPanel.add(createTransformer(new JCheckBox("JCheckBox")));
JSlider slider = new JSlider(0, 100);
slider.setLabelTable(slider.createStandardLabels(25, 0));
slider.setPaintLabels(true);
slider.setPaintTicks(true);
slider.setMajorTickSpacing(10);
buttonPanel.add(createTransformer(slider));
buttonPanel.add(createTransformer(new JRadioButton("JRadioButton")));
final JLabel label = new JLabel("JLabel");
label.addMouseListener(new MouseAdapter() {
public void mouseEntered(MouseEvent e) {
Font font = label.getFont();
label.setFont(font.deriveFont(font.getSize2D() + 10));
}
public void mouseExited(MouseEvent e) {
Font font = label.getFont();
label.setFont(font.deriveFont(font.getSize2D() - 10));
}
});
buttonPanel.add(createTransformer(label));
return buttonPanel;
}
private JXTransformer createTransformer(JComponent c) {
JXTransformer t = new JXTransformer(c);
transformers.add(t);
return t;
}
private JPanel createToolPanel() {
JPanel panel = new JPanel(new GridLayout(1, 0));
rotationSlider = new JSlider(-180, 180, 0);
rotationSlider.setLabelTable(rotationSlider.createStandardLabels(90, -180));
rotationSlider.setPaintLabels(true);
rotationSlider.setPaintTicks(true);
rotationSlider.setMajorTickSpacing(45);
rotationSlider.addChangeListener(this);
rotationSlider.setBorder(BorderFactory.createTitledBorder("Rotate"));
panel.add(rotationSlider);
shearingSlider = new JSlider(-10, 10, 0);
shearingSlider.setLabelTable(shearingSlider.createStandardLabels(5, -10));
shearingSlider.setPaintLabels(true);
shearingSlider.setPaintTicks(true);
shearingSlider.setMajorTickSpacing(2);
shearingSlider.addChangeListener(this);
shearingSlider.setBorder(BorderFactory.createTitledBorder("Shear"));
panel.add(shearingSlider);
scalingSlider = new JSlider(50, 150, 100);
scalingSlider.setLabelTable(scalingSlider.createStandardLabels(25, 50));
scalingSlider.setPaintLabels(true);
scalingSlider.setPaintTicks(true);
scalingSlider.setMajorTickSpacing(10);
scalingSlider.addChangeListener(this);
scalingSlider.setBorder(BorderFactory.createTitledBorder("Scale"));
panel.add(scalingSlider);
return panel;
}
public void stateChanged(ChangeEvent e) {
AffineTransform at = new AffineTransform();
at.rotate(rotationSlider.getValue() * Math.PI / 180);
double scale = scalingSlider.getValue() / 100.0;
at.scale(scale, scale);
double shear = shearingSlider.getValue() / 10.0;
at.shear(shear, 0);
for (JXTransformer t : transformers) {
t.setTransform(at);
}
}
public static void main(String[] args) {
TransformerDemo demo = new TransformerDemo();
demo.setSize(800, 600);
demo.setVisible(true);
}
}