[工具代码]Swing实现的播放器时间轴

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简介

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用Swing实现的播放器时间轴。这里只是展示时间轴的UI以及UI的事件监听逻辑，具体的播放、暂停、停止的逻辑需要自己实现）

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正文

• TimePanel

import com.danmuplayer.util.StringUtil;import com.danmuplayer.presenter.MainPresenter;import javax.swing.*;import javax.swing.event.ChangeEvent;import javax.swing.event.ChangeListener;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;public class TimePanel extends JPanel implements ChangeListener {    private JLabel mTimeLabel;    private JSlider mTimeSlider;    private MainPresenter mMainPresenter;    private JButton mPlayOrPauseButton;    private boolean mIsJumping = false;    public TimePanel(MainPresenter mainPresenter, int width, int height) {        this.mMainPresenter = mainPresenter;        this.setPreferredSize(new Dimension(width, height));        this.setSize(width, height);        this.setOpaque(false);        addComponets();    }    public void addComponets() {        this.setLayout(new GridBagLayout());        GridBagConstraints constraints = new GridBagConstraints();        constraints.fill = GridBagConstraints.BOTH;        constraints.insets = new Insets(5,0,5,5);        // add mPauseButton        constraints.gridwidth = 1;        mPlayOrPauseButton = new JButton("播放");        mPlayOrPauseButton.addActionListener(new ActionListener() {            public void actionPerformed(ActionEvent e) {                if(mMainPresenter.isPlaying()) {                    if(mMainPresenter.pause()) {                        mPlayOrPauseButton.setText("播放");                    }                } else {                    if(mMainPresenter.play()) {                        mPlayOrPauseButton.setText("暂停");                    }                }            }        });        this.add(mPlayOrPauseButton, constraints);        // add mTimeSlider        constraints.insets.left = 5;        constraints.gridwidth = 4;        constraints.weightx = 1;        mTimeSlider = new JSlider();        mTimeSlider.setValue(0);        mTimeSlider.setMaximum(0);        mTimeSlider.addMouseListener(                new MouseAdapter() {                    public void mousePressed(MouseEvent event) {                        mMainPresenter.stop(false);                        mIsJumping = true;                    }                });        mTimeSlider.addChangeListener(this);        this.add(mTimeSlider, constraints);        // add mTimeLabel        constraints.insets.right = 0;        constraints.gridwidth = GridBagConstraints.REMAINDER;        constraints.weightx = 0;        mTimeLabel = new JLabel();        mTimeLabel.setText("00:00/00:00");        mTimeLabel.setHorizontalAlignment(SwingConstants.LEFT);        mTimeLabel.setFont(new Font("微软雅黑", Font.PLAIN, 14));        this.add(mTimeLabel, constraints);    }    public void setMaxTimeInMs(int maxTime) {        mTimeSlider.setMaximum(maxTime);    }    private void updateTimeLabel() {        StringBuilder sb = new StringBuilder(StringUtil.timeInSToString(mTimeSlider.getValue() / 1000));        sb.append("/").append(StringUtil.timeInSToString(mTimeSlider.getMaximum() / 1000));        mTimeLabel.setText(sb.toString());    }    public void setCurrentTimeInMs(int currentTime) {        mTimeSlider.setValue(currentTime);    }    public void stateChanged(ChangeEvent event) {        JSlider source = (JSlider) event.getSource();        if (source.getVerifyInputWhenFocusTarget()) {            updateTimeLabel();        }        if (!source.getValueIsAdjusting()) {            if (mIsJumping) {                mIsJumping = false;                updateTimeLabel();                if(mMainPresenter.jumpTime(source.getValue())) {                    mPlayOrPauseButton.setText("暂停");                }            }        }    }    public void changePlayOrPauseButton(boolean isPlay) {        if (isPlay) {            mPlayOrPauseButton.setText("播放");        } else {            mPlayOrPauseButton.setText("暂停");        }    }}

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