!138 feature: #I85GSG 增加powershell 的UI组件

Merge pull request !138 from Luke/feature-I85GSG

src/main/java/org/jcnc/jnotepad/ui/CmdTerminal.java

@@ -0,0 +1,150 @@
+package org.jcnc.jnotepad.ui;
+
+import javafx.animation.KeyFrame;
+import javafx.animation.Timeline;
+import javafx.application.Platform;
+import javafx.concurrent.Task;
+import javafx.geometry.Insets;
+import javafx.scene.control.TextField;
+import javafx.scene.layout.Priority;
+import javafx.scene.layout.VBox;
+import javafx.util.Duration;
+import org.fxmisc.richtext.StyleClassedTextArea;
+import org.jcnc.jnotepad.api.util.LogUtil;
+
+import java.io.*;
+import java.nio.charset.Charset;
+
+/**
+ * 命令行终端界面。
+ *
+ * @author luke
+ */
+public class CmdTerminal extends VBox {
+
+    /**
+     * 用于显示命令输出的文本区域
+     */
+    private final StyleClassedTextArea cmdOutput;
+    /**
+     * 用户输入命令的文本框
+     */
+    private final TextField cmdInput;
+    /**
+     * 用于运行命令的进程
+     */
+    private Process cmdProcess;
+    /**
+     * 用于向命令进程发送输入的写入器
+     */
+    private PrintWriter cmdInputWriter;
+
+    String currentDirectory;
+
+    /**
+     * 创建CmdTerminal对象的构造函数。
+     */
+    public CmdTerminal() {
+        // 创建UI元素
+        cmdOutput = new StyleClassedTextArea();
+        cmdInput = new TextField();
+
+        // 设置CodeArea的大小策略和边距
+        // 让CodeArea在垂直方向上扩展以填充剩余空间
+        VBox.setVgrow(cmdOutput, Priority.ALWAYS);
+        // 设置CodeArea的边距
+        VBox.setMargin(cmdOutput, new Insets(8));
+
+        // 添加输入框的Enter键监听器，按下Enter执行命令
+        cmdInput.setOnAction(e -> executeCommand());
+
+        // 创建布局
+        getChildren().addAll(cmdOutput, cmdInput);
+
+        // 获取当前工作目录的文件夹路径
+        currentDirectory = System.getProperty("user.dir");
+
+
+        // 创建并启动cmd进程，使用GBK字符编码
+        try {
+            cmdProcess = new ProcessBuilder("cmd.exe")
+                    // 设置CMD工作目录为当前文件夹路径
+                    .directory(new File(currentDirectory))
+                    .redirectErrorStream(true)
+                    .start();
+            cmdInputWriter = new PrintWriter(new OutputStreamWriter(cmdProcess.getOutputStream(), Charset.forName("GBK")));
+        } catch (IOException e) {
+            LogUtil.getLogger(this.getClass()).info("已调用, {}", cmdProcess);
+        }
+
+
+        // 延迟执行打印当前文件夹路径的语句
+        Timeline timeline = new Timeline(new KeyFrame(Duration.seconds(0.5), event -> {
+            appendTextToCmdOutput(currentDirectory + ">" + "\n");
+
+        }));
+        timeline.setCycleCount(1);
+        timeline.play();
+
+        // 读取cmd的输出并显示在UI中
+        InputStream cmdOutputInputStream = cmdProcess.getInputStream();
+        BufferedReader reader = new BufferedReader(new InputStreamReader(cmdOutputInputStream, Charset.forName("GBK")));
+
+        Thread cmdOutputThread = getCmdOutputThread(reader);
+        cmdOutputThread.start();
+
+        // 关闭cmd进程
+        Platform.runLater(() -> getScene().getWindow().setOnCloseRequest(e -> {
+            if (cmdProcess != null) {
+                cmdProcess.destroy();
+            }
+        }));
+    }
+
+    private Thread getCmdOutputThread(BufferedReader reader) {
+        Task<Void> cmdOutputTask = new Task<>() {
+            @Override
+            protected Void call() {
+                String line;
+                try {
+                    while ((line = reader.readLine()) != null) {
+                        final String outputLine = line + "\n";
+                        Platform.runLater(() -> appendTextToCmdOutput(outputLine));
+                    }
+                } catch (IOException e) {
+                    LogUtil.getLogger(this.getClass()).info("已调用, {}", this);
+                }
+                return null;
+            }
+        };
+        Thread cmdOutputThread = new Thread(cmdOutputTask);
+        cmdOutputThread.setDaemon(true);
+        return cmdOutputThread;
+    }
+
+    /**
+     * 执行用户输入的命令。
+     */
+    private void executeCommand() {
+        String command = cmdInput.getText();
+        if (cmdProcess != null && command != null) {
+            cmdInputWriter.println(command);
+            cmdInputWriter.flush();
+            cmdInput.clear();
+        }
+    }
+
+    /**
+     * 将文本追加到命令输出文本区域，并滚动到最后一行。
+     *
+     * @param text 要追加的文本
+     */
+    private void appendTextToCmdOutput(String text) {
+        Platform.runLater(() -> {
+            cmdOutput.appendText(text);
+            // 将滚动条滚动到最后一行
+            cmdOutput.moveTo(cmdOutput.getLength());
+            cmdOutput.requestFollowCaret();
+        });
+    }
+}