Question

尝试制作类似的东西

https://www.youtube.com/watch?v=mPU6mnM2i-k

按下“停止”按钮可以选择不同的面板（我稍后会在其中放置字母并可能将它们更改为JButtons）。我通过添加一个计算它被按下次数的变量来改变它的动作。不是理想的事情，但有效。我想清理一下代码，但我不知道该怎么做。不确定我是否应该将SwingWorker放在某处并尝试使用一个Timer而不是三个。所有面板都保存在JPanels阵列中。它应该使代码更清晰，但显然它完全相反。该计划有效，但看起来很糟糕。请帮忙。

private final JPanel[] firstLevelPanels = new JPanel[2];
private final JPanel[] secondLevelPanels1 = new JPanel[3];
private final JPanel[] secondLevelPanels2 = new JPanel[3];
private final JPanel[] rowPanels1 = new JPanel[7];
private final JPanel[] rowPanels2 = new JPanel[7];
private final JPanel[] rowPanels3 = new JPanel[7];
private final JPanel[] rowPanels4 = new JPanel[7];
private final JPanel[] rowPanels5 = new JPanel[7];
private final JPanel[] rowPanels6 = new JPanel[7];
private final JPanel[][] allPanels = new JPanel[9][];
private int currentlyActivePanel = 0;
private int activeAncestorPanel = 0;
private int stopCounter = 0;
private int counter = 0;

class FirstLevelAction implements ActionListener{

    JPanel[] panel;

    @Override
    public void actionPerformed(ActionEvent e) {

        changeBackground(allPanels[activeAncestorPanel], counter);
        counter = (counter+1)%2;
    }

    public FirstLevelAction(JPanel[][] panels, int panelNumber) {

        this.panel = panels[panelNumber];
    } 
}

class SecondLevelAction implements java.awt.event.ActionListener{

    JPanel[] tempPanel;

    @Override
    public void actionPerformed(ActionEvent e) {

        changeBackground(allPanels[activeAncestorPanel], counter);
        counter = (counter+1)%3;
    }

    public SecondLevelAction(JPanel[][] panels, int panelNumber) {

        this.tempPanel = panels[panelNumber];
    }       
}

class ThirdLevelAction implements java.awt.event.ActionListener{

    JPanel[] tempPanel;

    @Override
    public void actionPerformed(ActionEvent e) {

        changeBackground(allPanels[activeAncestorPanel], counter);
        counter = (counter+1)%7;
    }

    public ThirdLevelAction(JPanel[][] panels, int panelNumber) {

        this.tempPanel = panels[panelNumber];
    }       
}

private void changeBackground(JPanel[] panels, int panelIndex){

    for(JPanel panel : panels){
        panel.setBackground(Color.GRAY);
    }
    panels[panelIndex].setBackground(Color.YELLOW);
    currentlyActivePanel = panelIndex;
}

private Timer timer1 = new Timer(500, new FirstLevelAction(allPanels, activeAncestorPanel));
private Timer timer2;
private Timer timer3;

private void stopButtonActionPerformed(java.awt.event.ActionEvent evt) {                                           
    // TODO add your handling code here:
    stopCounter++;
    counter = 0;
    if(stopCounter == 1){
        timer1.stop();
        activeAncestorPanel = currentlyActivePanel + 1;
        allPanels[0][currentlyActivePanel].setBackground(Color.GRAY);
        currentlyActivePanel = 0;
        timer2 = new Timer(500, new SecondLevelAction(allPanels, activeAncestorPanel));
        timer2.start();
    }else if(stopCounter == 2){
        timer2.stop();
        allPanels[activeAncestorPanel][currentlyActivePanel].setBackground(Color.GRAY);
        activeAncestorPanel = activeAncestorPanel + activeAncestorPanel*2 + currentlyActivePanel;
        currentlyActivePanel = 0;
        timer3 = new Timer(500, new ThirdLevelAction(allPanels, activeAncestorPanel));
        timer3.start();
    }else{
        timer3.stop();
        stopCounter = 0;
        allPanels[activeAncestorPanel][currentlyActivePanel].setBackground(Color.GRAY);
        activeAncestorPanel = 0;
        timer1 = new Timer(500, new FirstLevelAction(allPanels, activeAncestorPanel));
        timer1.start();
    }
}

Answer 1

您可以通过使用大小写切换和状态列表来使用状态机结构。请查看oracle文档以获取更多信息：https://docs.oracle.com/javase/tutorial/java/nutsandbolts/switch.html

基本上，您希望在初始化时将每个活动面板设置为相应的数字，如下所示：

     private static final int activePanelState = activePanel1;//whatever is default
     private static final int activePanel1 = 1;
     private static final int activePanel2 = 2;
     private static final int activePanel3 = 3;

然后在这些状态之间切换并在每种情况下调用正确的jPanel函数以及设置正确的转换：

例如。

switch(activePanelState){
     case activePanel1:
         jPanel1.setBackground(Color.YELLOW);
         jPanel2.setBackground(Color.GRAY);
         activePanelState = activePanel2;
        break;

等等。

自动换色/记忆

1 个答案: