Processing中如何关闭子窗口而不终止整个Sketch程序

要实现关闭子窗口时不终止整个Processing程序，核心是修改子窗口的默认关闭行为，将其从“退出整个程序”改为“仅销毁当前窗口”。具体操作如下：

关键修改步骤 #

• 获取子窗口的JFrame实例，修改其默认关闭操作
• 在ChildApplet类的setup()方法中添加代码，获取窗口的JFrame，设置DefaultCloseOperation为JFrame.DISPOSE_ON_CLOSE，替代默认的EXIT_ON_CLOSE
• 如果需要通过代码关闭子窗口，调用dispose()方法而非exit()

修改后的完整代码 #

import controlP5.*;
import javax.swing.JFrame; // 引入JFrame类

ControlP5 cp5;

PFont f_bebasNeueBold;

int resW = 1600;
int resH = 900;

int numOfLayouts = 0;

StringList layoutsFileData;
StringList testingArr;

String currentSpreadTitle = "null";
String parentPath;

ChildApplet newLayoutWindow;

//basic ui initialization
ui_window programHeader = new ui_window(0,0,resW,75,(#1D4077));
ui_window toolBar = new ui_window(0,75,resW,35,(#12284B));
ui_window infoPanel = new ui_window(15,programHeader.windowHeight + toolBar.windowHeight + 15,400,resH - 30 - programHeader.windowHeight - toolBar.windowHeight,(#12284B)); 
ui_window infoPanelHeader = new ui_window(15,infoPanel.windowYPos,400,60,(#1D4077));
//basic ui initialization

void setup() {
  size(1600,900);
  surface.setTitle("WarBoard - V.0.1");
  background(#F2F4F3);
  
  parentPath = sketchPath();
  
  //controlP5 elements
  cp5 = new ControlP5(this);
  
  ControlFont cf_buttonFont = new ControlFont(createFont("Bebas Neue Pro Bold.otf",14));
  
  cp5.addButton("buttonNewLayout")
     .setValue(0)
     .setPosition(10,toolBar.windowYPos + (toolBar.windowHeight / 2) - 10)
     .setSize(100,20)
     .setCaptionLabel("New Layout")
     .setColorBackground(color(#F2F4F3))
     .setColorForeground(color(#BFBFBF))
     .setColorActive(color(#999999))
     .setColorCaptionLabel(color(#12284B))
     .setFont(cf_buttonFont)
     .setBroadcast(false)
     .addCallback(new CallbackListener() {
       public void controlEvent(CallbackEvent event) {
         if (event.getAction() == ControlP5.ACTION_RELEASED) {
           launchNewLayoutWindow();
         }
       }
     }
     );
  //controlP5 elements
  
  layoutsFileData = new StringList();
  testingArr = new StringList();
  
  f_bebasNeueBold = createFont("Bebas Neue Pro Bold.otf", 1000);
  
  if (checkFileStructure()) {
    String tempFileData[] = loadStrings("data/layouts.txt");
    for (int i = 0; i < tempFileData.length; i++) {
      layoutsFileData.append(tempFileData[i]);
    }
  }
  else {
    String setupFileStruct = "0|";
    String[] fileStruct = split(setupFileStruct, '|');
    saveStrings("data/layouts.txt", fileStruct);
    
    String tempFileData[] = loadStrings("data/layouts.txt");
    for (int i = 0; i < tempFileData.length; i++) {
      layoutsFileData.append(tempFileData[i]);
    }  
    numOfLayouts = 0;
  }
  
  numOfLayouts = int(layoutsFileData.get(0));
  
  testingArr.append("1");
  testingArr.append("2");
  newLayout("Test Layout", testingArr);
  
}

void draw() {
  programHeader.update();
  toolBar.update();
  infoPanel.update();
  infoPanelHeader.update();
  
  easyText("WARBOARD", width/2, (programHeader.windowHeight / 2) - 15, 32, (#F2F4F3), CENTER, CENTER);
  easyText("VERSION 0.1", width/2, (programHeader.windowHeight / 2) + 15, 24, (#F2F4F3), CENTER, CENTER);
  
  easyText(currentSpreadTitle, infoPanelHeader.windowXPos + (infoPanelHeader.windowWidth / 2), infoPanelHeader.windowYPos + (infoPanelHeader.windowHeight / 2), 32, (#F2F4F3), CENTER, CENTER);
}

class ui_window {
  color fillColor;
  float windowWidth, windowHeight;
  float windowXPos, windowYPos;
  
  ui_window (float x, float y, float inputWidth, float inputHeight, color inputColor) {
    windowXPos = x;
    windowYPos = y;
    windowWidth = inputWidth;
    windowHeight = inputHeight;
    fillColor = inputColor;
  }
  
  void update() {
    noStroke();
    fill(fillColor);
    rect(windowXPos, windowYPos, windowWidth, windowHeight);
  }
  
}

void easyText(String textDisplay, float textXPos, float textYPos, float textFontSize, color textColor, int textFontAlignX, int textFontAlignY) {
  noStroke();
  fill(textColor);
  textFont(f_bebasNeueBold);
  textSize(textFontSize);
  textAlign(textFontAlignX, textFontAlignY);
  text(textDisplay, textXPos, textYPos);
}

void newLayout(String layoutName, StringList layoutPositions) {
  
  layoutsFileData.append("#" + str(numOfLayouts));
  layoutsFileData.append(layoutName);
  for (int i = 0; i < layoutPositions.size(); i++) {
    layoutsFileData.append(layoutPositions.get(i));
  }
  layoutsFileData.append("");
  numOfLayouts += 1;
  layoutsFileData.set(0, str(numOfLayouts));
  
  saveAndUpdate();
}

void saveAndUpdate() {
  saveStrings("data/layouts.txt", layoutsFileData.toArray());
}

boolean checkFileStructure() {
  
  InputStream input = createInput("layouts.txt");
  
  if (input == null) {
    return false;
  }
  else {
    return true;
  }
}

public void launchNewLayoutWindow() {
  newLayoutWindow = new ChildApplet(2, displayWidth / 2 - 400, displayHeight / 2 - 225, 800, 450);
}

// New Layouts Window --------------------------------------------------------
class ChildApplet extends PApplet {
  int id, vx, vy, vw, vh;
  int bckColor;
  PFont f_bebasNeueBoldNewLayout;
  
  void easyTextNewLayout(String textDisplay, float textXPos, float textYPos, float textFontSize, color textColor, int textFontAlignX, int textFontAlignY) {
  noStroke();
  fill(textColor);
  textFont(f_bebasNeueBoldNewLayout);
  textSize(textFontSize);
  textAlign(textFontAlignX, textFontAlignY);
  text(textDisplay, textXPos, textYPos);
}
  

  ChildApplet(int id, int vx, int vy, int vw, int vh) {
    super();
    this.id = id;
    this.vx = vx;
    this.vy = vy;
    this.vw = vw;
    this.vh = vh;

    PApplet.runSketch(new String[] {this.getClass().getName()}, this);
  }

  void settings() {
    size(vw, vh, P2D);
    smooth(0);
    println("Creating window "+ id);
  }

  void setup() {
    windowMove(vx, vy);
    windowResizable(true);
    
    // *关键修改：设置子窗口关闭行为*
    JFrame frame = (JFrame)this.getSurface().getNative();
    frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    
    cp5 = new ControlP5(this);
    f_bebasNeueBoldNewLayout = createFont(parentPath + "/data/" + "Bebas Neue Pro Bold.otf", 20);
    ControlFont cf_inputFont = new ControlFont(createFont(parentPath + "/data/" + "Bebas Neue Pro Bold.otf",20));
        
    cp5.addTextfield("input")
     .setCaptionLabel("") 
     .setColorCaptionLabel(color(#12284B))
     .setPosition(15,40)
     .setSize(400,40)
     .setFocus(true)
     .setColor(color(#F2F4F3))
     .setFont(cf_inputFont)
     ;
          
  }

  void draw() {
    
    background(#F2F4F3);
    windowTitle("WarBoard - Create New Layout");
    
    easyTextNewLayout("Layout Name:", 15,15,20,color(#12284B),LEFT,TOP);
  }
  
  // 可选：添加代码关闭子窗口的方法
  void closeWindow() {
    this.getSurface().getNative().dispose();
  }
}
// New Layouts Window --------------------------------------------------------

说明 #

• 首先需要引入javax.swing.JFrame类，用于操作窗口的关闭行为
• 在ChildApplet的setup()中，通过getSurface().getNative()获取窗口的原生JFrame实例
• JFrame.DISPOSE_ON_CLOSE会在关闭窗口时释放该窗口占用的资源，但不会终止整个Processing程序
• 如果需要通过代码触发子窗口关闭，调用closeWindow()方法即可，避免使用exit()（会终止整个程序）

内容的提问来源于stack exchange，提问作者ColtTheNark