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“抛砖引玉”

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）

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 mPauseButtonconstraints.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 mTimeSliderconstraints.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 mTimeLabelconstraints.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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