[工具代码]Swing实现的播放器时间轴

“抛砖引玉”

简介

跳过废话，直接看正文

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");
        }
    }
}

后记

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