Eclipse SWT Tree使用遞迴方法,實現Tree顯示目錄的顯示
阿新 • • 發佈:2019-02-09
使用Eclipse 的SWT技術實現的一個將檔案目錄展示到SWT Tree中的功能,方法中使用的採用遞迴呼叫的形式,將檔案目錄中的所有層級的檔名稱展示到樹形目錄中。
如果每一層目錄採用一個迴圈遍歷檔案物件中的檔案陣列,這樣只能遍歷到最底層的迴圈程式碼中,始終不能遍歷到最底層的檔案中,所以採用了方法的遞迴呼叫進行逐層遍歷的形式,方法執行結束也就是檔案遍歷到了最底層的時候。
廢話少說,貼出實現的功能截圖
實現程式碼:
package swt_jface.demo3; import java.io.File; import java.util.Vector; import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Tree; import org.eclipse.swt.widgets.TreeItem; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.TreeColumn; import org.eclipse.swt.events.KeyAdapter; import org.eclipse.swt.events.KeyEvent; public class TreeTest { //遞迴方法 public static void listFiles(File rootFile, TreeItem item) { File[] files = rootFile.listFiles(); if (files != null && files.length > 0) { for (int i = 0; i < files.length; i++) { System.out.println(files[i].getName()); TreeItem subItem = new TreeItem(item, SWT.None); subItem.setText(files[i].getName()); listFiles(files[i], subItem); } } } public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setLayout(new FillLayout(SWT.HORIZONTAL)); Vector<Category> categories = new Vector<Category>(); Category category = new Category("Java libraries", null); categories.add(category); category = new Category("UI Toolkits", category); new Category("AWT", category); new Category("Swing", category); new Category("SWT/JFace", category); category = new Category("Java IDEs", null); categories.add(category); new Category("Eclipse", category); new Category("JBuilder", category); shell.setSize(300, 200); { Composite composite = new Composite(shell, SWT.NONE); composite.setLayout(new FillLayout(SWT.HORIZONTAL)); { final Tree tree = new Tree(composite, SWT.BORDER | SWT.FULL_SELECTION); tree.addKeyListener(new KeyAdapter() { @Override public void keyPressed(KeyEvent e) { File file = new File("D:\\Workplace for SBD\\Workstation"); File[] files = file.listFiles(); tree.setItemCount(0); for (int i = 0; i < files.length; i++) { TreeItem item = new TreeItem(tree, SWT.NONE); item.setText(files[i].getName()); //呼叫遞迴方法 listFiles(files[i], item); } } }); tree.setLinesVisible(true); tree.setHeaderVisible(true); { TreeColumn treeColumn = new TreeColumn(tree, SWT.NONE); treeColumn.setWidth(100); treeColumn.setText("New Column"); } } } shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } static class Category { private String name; private Vector<Category> subCategories; private Category parent; public Category(String name, Category parent) { this.name = name; this.parent = parent; if (parent != null) parent.addSubCategory(this); } public Vector<Category> getSubCategories() { return subCategories; } private void addSubCategory(Category subcategory) { if (subCategories == null) subCategories = new Vector<Category>(); if (!subCategories.contains(subcategory)) subCategories.add(subcategory); } public String getName() { return name; } public Category getParent() { return parent; } } }