我需要使用我的框架和内部面板进行动画运动。
当用户点击特定的内部面板（面板内部的面板）时，另一个面板被添加到框架的contentPane，然后框架和新面板的宽度增加，但我总是希望我的框架在屏幕中间。我用这种方式解决了动画：
Container container=getContentPane();
int i=0;
ActionListener run = new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
frame.setSize(new Dimension(frame.getSize().width + 20, 550));
frame.setLocationRelativeTo(null);
//newp is the panel which is just added
newp.setPreferredSize(new Dimension(newp.getSize().width + 20, 550));
revalidate();
repaint();
container.revalidate();
container.repaint();
if (i > 20)
{
previousPanel = newp;
i = 0;
setInnerPanel(); // add another panel to added panel
container.revalidate();
container.repaint();
timer.stop();
}
i++;
}
};
timer = new Timer(15, run);
timer.setRepeats(true);
timer.start();
现在有一个重要问题。动画不流畅。我将定时器延迟更改为20或更多但是没有出现好的平滑动画......如何解决？
答案 0 :(得分：2)
快速示例，持续时间可变......
public class TestAnimatedWindow {
public static void main(String[] args) {
new TestAnimatedWindow();
}
public TestAnimatedWindow() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new AnimatedPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class AnimatedPane extends JPanel {
private GridBagConstraints gbc = new GridBagConstraints();
private Timer anim;
private long startTime;
private int duration = 1000;
private Rectangle startBounds, targetBounds;
private JPanel top;
private JPanel bottom;
private JSlider durationSlider;
private JLabel durationLabel;
private JPanel content;
public AnimatedPane() {
top = new JPanel();
bottom = new JPanel(new GridBagLayout());
content = new JPanel(new GridBagLayout());
durationLabel = new JLabel("1000");
durationSlider = new JSlider(125, 5000);
durationSlider.setMajorTickSpacing(1000);
durationSlider.setMinorTickSpacing(500);
durationSlider.setPaintTicks(true);
durationSlider.setValue(1000);
GridBagConstraints gbcBottom = new GridBagConstraints();
gbcBottom.weightx = 1;
gbcBottom.fill = GridBagConstraints.HORIZONTAL;
bottom.add(durationSlider, gbcBottom);
gbcBottom.weightx = 0;
gbcBottom.fill = GridBagConstraints.NONE;
bottom.add(durationLabel, gbcBottom);
durationSlider.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
int value = durationSlider.getValue();
durationLabel.setText(Integer.toString(value));
}
});
setLayout(new BorderLayout());
gbc.gridwidth = GridBagConstraints.REMAINDER;
JButton grow = new JButton("Grow");
top.add(grow, gbc);
add(top, BorderLayout.NORTH);
add(content);
add(bottom, BorderLayout.SOUTH);
grow.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// Stop any animation...
anim.stop();
// Get the window...
Window window = SwingUtilities.windowForComponent(AnimatedPane.this);
// What's the windows current bounds...
startBounds = window.getBounds();
// Add a new component...
JPanel panel = new JPanel(new GridBagLayout());
panel.add(new JLabel("Boo"));
panel.setBorder(new LineBorder(Color.RED));
content.add(panel, gbc);
// Calculate the bounds we want the window to get to
targetBounds = new Rectangle();
// Add in the insets of the windows borders
Insets insets = window.getInsets();
// Get out preferred size...
Dimension size = getPreferredSize();
// Add in the border size...
size.width += insets.left + insets.right;
size.height += insets.top + insets.bottom;
targetBounds.setSize(size);
// Calculate the viewable position...
// Get the viewable screen bounds...
Rectangle viewBounds = getScreenViewableBounds();
Point p = new Point();
// Calculate the center of the screen...
p.x = ((viewBounds.width - size.width) / 2) + viewBounds.x;
p.y = ((viewBounds.height - size.height) / 2) + viewBounds.y;
targetBounds.setLocation(p);
// Divisibale by 2, stop the animation jitters
if (targetBounds.width % 2 != 0) {
targetBounds.width++;
}
if (targetBounds.height % 2 != 0) {
targetBounds.height++;
}
// Get the time that the animation started...
startTime = System.currentTimeMillis();
// Get the duration of the animation...
duration = durationSlider.getValue();
// Start animation...
anim.restart();
}
});
// Timer set to about 25 fps...
anim = new Timer(40, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// Get the current timer
long now = System.currentTimeMillis();
// Calculate the difference between now and the start of the animation...
long diff = now - startTime;
// Get out window...
Window window = SwingUtilities.getWindowAncestor(AnimatedPane.this);
// The bounds of the window to use
Rectangle bounds = targetBounds;
// If we've not reached the end of animation cycle...
if (diff < duration) {
// Calculate the progress of the aniamtion...
// That is, the amount of time the animation has been running for
// and the duration
double progress = (double) diff / (double) duration;
// Calculate the bounds over the progress range...
bounds = calculateProgress(startBounds, targetBounds, progress);
// Divisiable by 2..
if (bounds.width % 2 != 0) {
bounds.width++;
}
if (bounds.height % 2 != 0) {
bounds.height++;
}
} else {
// Stop the timer..
((Timer) e.getSource()).stop();
}
// Update the windows bounds
window.setBounds(bounds);
}
});
anim.setRepeats(true);
anim.setCoalesce(true);
anim.setInitialDelay(0);
}
}
public static Rectangle calculateProgress(Rectangle startBounds, Rectangle targetBounds, double progress) {
Rectangle bounds = new Rectangle();
if (startBounds != null && targetBounds != null) {
bounds.setLocation(calculateProgress(startBounds.getLocation(), targetBounds.getLocation(), progress));
bounds.setSize(calculateProgress(startBounds.getSize(), targetBounds.getSize(), progress));
}
return bounds;
}
public static Dimension calculateProgress(Dimension startSize, Dimension targetSize, double progress) {
Dimension size = new Dimension();
if (startSize != null && targetSize != null) {
size.width = calculateProgress(startSize.width, targetSize.width, progress);
size.height = calculateProgress(startSize.height, targetSize.height, progress);
}
return size;
}
public static Point calculateProgress(Point startPoint, Point targetPoint, double progress) {
Point point = new Point();
if (startPoint != null && targetPoint != null) {
point.x = calculateProgress(startPoint.x, targetPoint.x, progress);
point.y = calculateProgress(startPoint.y, targetPoint.y, progress);
}
return point;
}
public static int calculateProgress(int startValue, int endValue, double fraction) {
int value = 0;
int distance = endValue - startValue;
value = (int) ((float) distance * fraction);
value += startValue;
return value;
}
public static Rectangle getScreenViewableBounds() {
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gd = ge.getDefaultScreenDevice();
return getScreenViewableBounds(gd);
}
public static Rectangle getScreenViewableBounds(GraphicsDevice gd) {
Rectangle bounds = new Rectangle(0, 0, 0, 0);
if (gd != null) {
GraphicsConfiguration gc = gd.getDefaultConfiguration();
bounds = gc.getBounds();
Insets insets = Toolkit.getDefaultToolkit().getScreenInsets(gc);
bounds.x += insets.left;
bounds.y += insets.top;
bounds.width -= (insets.left + insets.right);
bounds.height -= (insets.top + insets.bottom);
}
return bounds;
}
}