Java:使用计时器移动 jLabel 两次

Question

我从事 jFrame 项目:

我有jlabel，我想在动画中移动它，然后移动另一个jlabel 换句话说，我希望第一个 jlabel 移动，然后当它完成时，第二个 jlabel 移动。

我已经尝试过了，但没有成功。我有一个移动一个jlabel的功能 如果我尝试在两个 jlabel 上使用它，则两个 jlabel 同时移动，我不希望这种情况发生。

你能帮我做一下吗，非常感谢。

这是我的功能:

public void MoveForPlayer(JLabel PlayerCard)
{

    int delay = q; 
    ActionListener taskPerformer = new ActionListener() {
       int count=0;

       @Override
       public void actionPerformed(ActionEvent evt) {
           if(count==20) {
              ((Timer)evt.getSource()).stop();                              
           }
           PlayerCard.setLocation((PlayerCard.getLocation().x-5), PlayerCard.getLocation().y+5);
           count++;
       }
   };
   new Timer(delay, taskPerformer).start();     
}

Answer 1

您可以查看类似 this example 的内容它将动画层包裹在 GridBagLayout 或诸如 this 之类的东西周围这是基于 Universal Tween Engine

这是第一个示例的修改版本，它添加了在特定布局序列的动画完成时收到通知的功能。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.LayoutManager2;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.EventListener;
import java.util.EventObject;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.LineBorder;
import javax.swing.event.EventListenerList;

public class TestAnimatedLayout {

    public static void main(String[] args) {
        new TestAnimatedLayout();
    }

    public TestAnimatedLayout() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException ex) {
                } catch (InstantiationException ex) {
                } catch (IllegalAccessException ex) {
                } catch (UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestAnimatedLayoutPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }

        });
    }

    public class TestAnimatedLayoutPane extends JPanel {

        private Card card1, card2;

        public TestAnimatedLayoutPane() {
            AnimatedLayout animatedLayout = new AnimatedLayout(new GridBagLayout());
            animatedLayout.addLayoutAnimationListener(new LayoutAnimationListener() {
                @Override
                public void layoutAnimationStopped(LayoutAnimationEvent evt) {
                    System.out.println("Stoppped");
                    if (card2 == null) {
                        card2 = new Card("2");
                        GridBagConstraints gbc = new GridBagConstraints();
                        gbc.insets = new Insets(4, 4, 4, 4);
                        gbc.gridx = 1;
                        gbc.gridy = 0;
                        add(card2, gbc);
                        revalidate();
                    }
                }
            });
            setLayout(animatedLayout);
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.insets = new Insets(4, 4, 4, 4);
            gbc.gridx = 0;
            gbc.gridy = 0;
            card1 = new Card("1");
            add(card1, gbc);
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(200, 200);
        }

    }

    public class Card extends JLabel {

        public Card(String text) {
            super(text);
            setHorizontalAlignment(CENTER);
            setVerticalAlignment(CENTER);
            setBorder(new LineBorder(Color.BLACK));
            setOpaque(true);
            setBackground(Color.WHITE);
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(50, 100);
        }

    }

    public class LayoutAnimationEvent extends EventObject {

        private Container parent;

        public LayoutAnimationEvent(AnimatedLayout source, Container parent) {
            super(source);
            this.parent = parent;
        }

        public Container getParent() {
            return parent;
        }

        public AnimatedLayout getAnimationLayout() {
            return (AnimatedLayout) getSource();
        }

    }

    public interface LayoutAnimationListener extends EventListener {

        public void layoutAnimationStopped(LayoutAnimationEvent evt);

    }

    public class AnimatedLayout implements LayoutManager2 {

        private EventListenerList listenerList = new EventListenerList();

        private LayoutManager2 proxy;
        private Map<Component, Rectangle> mapStart;
        private Map<Component, Rectangle> mapTarget;
        private Map<Container, Timer> mapTrips;
        private Map<Container, Animator> mapAnimators;

        public AnimatedLayout(LayoutManager2 proxy) {
            this.proxy = proxy;
            mapTrips = new WeakHashMap<>(5);
            mapAnimators = new WeakHashMap<>(5);
        }

        public void addLayoutAnimationListener(LayoutAnimationListener listener) {
            listenerList.add(LayoutAnimationListener.class, listener);
        }

        public void removeLayoutAnimationListener(LayoutAnimationListener listener) {
            listenerList.add(LayoutAnimationListener.class, listener);
        }

        protected void fireAnimationStopped(Container parent) {
            LayoutAnimationListener[] listeners = listenerList.getListeners(LayoutAnimationListener.class);
            if (listeners != null && listeners.length > 0) {
                LayoutAnimationEvent evt = new LayoutAnimationEvent(this, parent);
                for (LayoutAnimationListener listener : listeners) {
                    listener.layoutAnimationStopped(evt);
                }
            }
        }

        @Override
        public void addLayoutComponent(String name, Component comp) {
            proxy.addLayoutComponent(name, comp);
        }

        @Override
        public void removeLayoutComponent(Component comp) {
            proxy.removeLayoutComponent(comp);
        }

        @Override
        public Dimension preferredLayoutSize(Container parent) {
            return proxy.preferredLayoutSize(parent);
        }

        @Override
        public Dimension minimumLayoutSize(Container parent) {
            return proxy.minimumLayoutSize(parent);
        }

        @Override
        public void layoutContainer(Container parent) {
            Timer timer = mapTrips.get(parent);
            if (timer == null) {
                System.out.println("...create new trip");
                timer = new Timer(125, new TripAction(parent));
                timer.setRepeats(false);
                timer.setCoalesce(false);
                mapTrips.put(parent, timer);
            }
            System.out.println("trip...");
            timer.restart();
        }

        protected void doLayout(Container parent) {

            System.out.println("doLayout...");

            mapStart = new HashMap<>(parent.getComponentCount());

            for (Component comp : parent.getComponents()) {
                mapStart.put(comp, (Rectangle) comp.getBounds().clone());
            }

            proxy.layoutContainer(parent);

            LayoutConstraints constraints = new LayoutConstraints();
            for (Component comp : parent.getComponents()) {
                Rectangle bounds = comp.getBounds();
                Rectangle startBounds = mapStart.get(comp);
                if (!mapStart.get(comp).equals(bounds)) {

                    if (startBounds.x == 0 && startBounds.y == 0) {

                        startBounds.x = (parent.getWidth() - startBounds.width) / 2;
                        startBounds.y = (parent.getHeight() - startBounds.height) / 2;

                    }

                    comp.setBounds(startBounds);
                    constraints.add(comp, startBounds, bounds);
                }
            }

            System.out.println("Items to layout " + constraints.size());
            if (constraints.size() > 0) {
                Animator animator = mapAnimators.get(parent);
                if (animator == null) {
                    animator = new Animator(this, parent, constraints);
                    mapAnimators.put(parent, animator);
                } else {
                    animator.setConstraints(constraints);
                }
                animator.restart();
            } else {
                if (mapAnimators.containsKey(parent)) {
                    Animator animator = mapAnimators.get(parent);
                    animator.stop();
                    mapAnimators.remove(parent);
                }
            }

        }

        @Override
        public void addLayoutComponent(Component comp, Object constraints) {
            proxy.addLayoutComponent(comp, constraints);
        }

        @Override
        public Dimension maximumLayoutSize(Container target) {
            return proxy.maximumLayoutSize(target);
        }

        @Override
        public float getLayoutAlignmentX(Container target) {
            return proxy.getLayoutAlignmentX(target);
        }

        @Override
        public float getLayoutAlignmentY(Container target) {
            return proxy.getLayoutAlignmentY(target);
        }

        @Override
        public void invalidateLayout(Container target) {
            proxy.invalidateLayout(target);
        }

        protected void animationDidStop(Container parent) {
            fireAnimationStopped(parent);
        }

        protected class TripAction implements ActionListener {

            private Container container;

            public TripAction(Container container) {
                this.container = container;
            }

            @Override
            public void actionPerformed(ActionEvent e) {
                System.out.println("...trip");
                mapTrips.remove(container);
                doLayout(container);
            }

        }

    }

    public class LayoutConstraints {

        private List<AnimationBounds> animationBounds;

        public LayoutConstraints() {
            animationBounds = new ArrayList<AnimationBounds>(25);
        }

        public void add(Component comp, Rectangle startBounds, Rectangle targetBounds) {

            add(new AnimationBounds(comp, startBounds, targetBounds));

        }

        public void add(AnimationBounds bounds) {

            animationBounds.add(bounds);

        }

        public int size() {
            return animationBounds.size();
        }

        public AnimationBounds[] getAnimationBounds() {

            return animationBounds.toArray(new AnimationBounds[animationBounds.size()]);

        }

    }

    public class AnimationBounds {

        private Component component;
        private Rectangle startBounds;
        private Rectangle targetBounds;

        public AnimationBounds(Component component, Rectangle startBounds, Rectangle targetBounds) {
            this.component = component;
            this.startBounds = startBounds;
            this.targetBounds = targetBounds;
        }

        public Rectangle getStartBounds() {
            return startBounds;
        }

        public Rectangle getTargetBounds() {
            return targetBounds;
        }

        public Component getComponent() {
            return component;
        }

        public Rectangle getBounds(float progress) {

            return calculateProgress(getStartBounds(), getTargetBounds(), progress);

        }

    }

    public static Rectangle calculateProgress(Rectangle startBounds, Rectangle targetBounds, float 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 Point calculateProgress(Point startPoint, Point targetPoint, float 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 Dimension calculateProgress(Dimension startSize, Dimension targetSize, float 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 int calculateProgress(int startValue, int endValue, float fraction) {

        int value = 0;
        int distance = endValue - startValue;
        value = (int) ((float) distance * fraction);
        value += startValue;

        return value;

    }

    public class Animator implements ActionListener {

        private Timer timer;
        private LayoutConstraints constraints;
        private int tick;
        private Container parent;
        private AnimatedLayout layout;

        public Animator(AnimatedLayout layout, Container parent, LayoutConstraints constraints) {
            setConstraints(constraints);
            timer = new Timer(16, this);
            timer.setRepeats(true);
            timer.setCoalesce(true);
            this.parent = parent;
            this.layout = layout;
        }

        private void setConstraints(LayoutConstraints constraints) {
            this.constraints = constraints;
        }

        public void restart() {
            tick = 0;
            timer.restart();
        }

        protected void stop() {
            timer.stop();
            tick = 0;
        }

        @Override
        public void actionPerformed(ActionEvent e) {

            tick += 16;
            float progress = (float) tick / (float) 1000;
            if (progress >= 1f) {
                progress = 1f;
                timer.stop();
                layout.animationDidStop(parent);
            }

            for (AnimationBounds ab : constraints.getAnimationBounds()) {
                Rectangle bounds = ab.getBounds(progress);
                Component comp = ab.getComponent();
                comp.setBounds(bounds);
                comp.invalidate();
                comp.repaint();
            }

            parent.repaint();

        }

    }

}

在你告诉我“它太复杂”之前，请先了解动画本身就是一个复杂的主题，但是当尝试对应该在适当的布局管理器的控制下的组件进行动画处理时，它会变得更加复杂......