Tree Check 带复选框的树

编程技术  /  houtizong 发布于 3年前   73

 

在SWT/JFace中，带复选框树最好使用ContainerCheckedTreeViewer(或者CheckedTreeViewer)来实现，今天遇到直接使用tree来实现的。

简单备记：

import java.awt.image.BufferedImage;import java.io.File;import javax.swing.Icon;import javax.swing.ImageIcon;import javax.swing.filechooser.FileSystemView;import javax.swing.plaf.IconUIResource;import org.eclipse.core.runtime.Platform;import org.eclipse.jface.dialogs.Dialog;import org.eclipse.jface.dialogs.IDialogConstants;import org.eclipse.swt.SWT;import org.eclipse.swt.events.SelectionAdapter;import org.eclipse.swt.events.SelectionEvent;import org.eclipse.swt.graphics.Image;import org.eclipse.swt.graphics.ImageData;import org.eclipse.swt.layout.FormAttachment;import org.eclipse.swt.layout.FormData;import org.eclipse.swt.layout.FormLayout;import org.eclipse.swt.widgets.Composite;import org.eclipse.swt.widgets.Control;import org.eclipse.swt.widgets.Display;import org.eclipse.swt.widgets.Event;import org.eclipse.swt.widgets.Label;import org.eclipse.swt.widgets.Listener;import org.eclipse.swt.widgets.Shell;import org.eclipse.swt.widgets.Tree;import org.eclipse.swt.widgets.TreeItem;import org.eclipse.ui.internal.UIPlugin;/** * <p> * Title: MultiDirectoryDialog.java * </p> * <p> * Description: 文件选择框，支持多选 * </p> *   */public class MultiDirectoryDialog extends Dialog {// 菜单提示private String message = "";private Shell parent;// 列表树private Tree tree;// 用来获取系统文件的相关信息private FileSystemView fsv;// 用来存放选择的文件夹,用分号隔开private StringBuilder resultFile = new StringBuilder("");/** * 构造方法 *  * @param parent *            父类 */public MultiDirectoryDialog(Shell parent) {super(parent);this.parent = parent;}/* * (non-Javadoc) *  * @see * org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets * .Composite) */protected Control createDialogArea(Composite parent) {parent.setDragDetect(false);Composite container = (Composite) super.createDialogArea(parent);container.setLayout(new FormLayout());final Label showTipLabel = new Label(container, SWT.NONE | SWT.MULTI);showTipLabel.setText(message);final FormData fd_showTipLabel = new FormData();fd_showTipLabel.top = new FormAttachment(0, 15);fd_showTipLabel.bottom = new FormAttachment(0, 32);fd_showTipLabel.right = new FormAttachment(0, 170);fd_showTipLabel.left = new FormAttachment(0, 30);showTipLabel.setLayoutData(fd_showTipLabel);final Composite treeComposite = new Composite(container, SWT.BORDER);treeComposite.setDragDetect(false);treeComposite.setLayout(new FormLayout());// treeComposite.set// scrolledComposite.setAlwaysShowScrollBars(true);final FormData fd_scrolledComposite = new FormData();fd_scrolledComposite.right = new FormAttachment(100, 0);fd_scrolledComposite.left = new FormAttachment(0, 0);fd_scrolledComposite.bottom = new FormAttachment(100, 0);fd_scrolledComposite.top = new FormAttachment(0, 50);treeComposite.setLayoutData(fd_scrolledComposite);// 新建树tree = new Tree(treeComposite, SWT.DEFAULT);final FormData fd_tree = new FormData();fd_tree.left = new FormAttachment(0, 5);fd_tree.bottom = new FormAttachment(0, 300);fd_tree.top = new FormAttachment(0, 0);fd_tree.right = new FormAttachment(0, 400);tree.setLayoutData(fd_tree);treeComposite.setData(tree);// 为树增加单击方法tree.addListener(SWT.Expand, new Listener() {public void handleEvent(final Event event) {final TreeItem item = (TreeItem) event.item;TreeItem[] items = item.getItems();for (int i = 0; i < items.length; i++) {if (items[i].getData() != null)return;items[i].dispose();}// 初始化该文件下的节点File file = (File) item.getData();File[] childFile = file.listFiles();for (File sfile : childFile) {if (sfile.isDirectory()) {initFile(item, sfile);}}}});// 获取系统文件信息fsv = FileSystemView.getFileSystemView();File[] file = fsv.getRoots();TreeItem item = new TreeItem(this.tree, SWT.NONE);String fileName = file[0].getName();item.setText(fileName);item.setData(file[0]);Image img = getIcon(file[0]);if (img != null)item.setImage(img);// new TreeItem(item, 0);listFile(item, file[0], 1);return container;}/** * 本类用来初始化文件夹下的文件夹 *  * @param treeitem *            父节点 * @param file *            要初始化的文件夹 * @param flag *            0：由外部调用，其它：递归调用 */private void listFile(TreeItem treeitem, File file, int flag) {File[] childFile = file.listFiles();if (flag == 0) {// 如果是外部调用，则再初始一级，以用来显示图标前的十一号。for (File sfile : childFile) {if (sfile.isDirectory()) {// 初始化item的相关数据TreeItem item = initFile(treeitem, sfile);// 初始化下一级itemlistFile(item, sfile, 1);// 只多这一行}}} else {// 如果是自身调用，则说明已经为第二级文件夹，不需要再初始化下一级for (File sfile : childFile) {if (sfile.isDirectory()) {initFile(treeitem, sfile);}}}}/** * 初始化item的相关数据 *  * @param treeitem *            要初始化item的父item * @param file *            初始化item对应的file * @return 初始化后的item */private TreeItem initFile(TreeItem treeitem, File file) {TreeItem item = new TreeItem(treeitem, SWT.NONE);item.setText(fsv.getSystemDisplayName(file));item.setData(file);Image img = getIcon(file);if (img != null)item.setImage(img);// 如果还是文件夹，则加一个空节点，以使十号显示出来if (file.isDirectory())new TreeItem(item, 0);return item;}/** * 获取文件图标 *  * @param file *            要获取图标的文件 * @return 图标 */public Image getIcon(File file) {ImageData imageData = null;// 取得awt的icon对像并转化为swt的image对像Icon icon = fsv.getSystemIcon(file);if (icon instanceof IconUIResource) {} else {// BufferedImage bi = ImageConvertor.getBufferedImage((ImageIcon)// icon);// imageData = ImageConvertor.getImageData(bi);// imageData = new Image(Display.getDefault(),50,50).getImageData();}Image img = null;if (imageData != null)img = new Image(parent.getDisplay(), imageData);return img;}/** * Create contents of the button bar *  * @param parent */@Overrideprotected void createButtonsForButtonBar(Composite parent) {createButton(parent, IDialogConstants.OK_ID, "确定", true);createButton(parent, IDialogConstants.CANCEL_ID, "取消", false);}/**  SWT.MULTI创建出可以让用户作出多重选取的tree。SWT.CHECK样式的Tree会产生checkbox的Tree。如果使用了SWT.CHECK的样式，就需要判断哪些项目被选取了。通过调用TreeItem的getChecked()来判断某个项目是否被checked。下面的程序在循环中判断每个TreeItem的状态：TreeItem[] tia=t.getItems();  for(int i=0;i<tia.length;i++){   if(tia[i].getChecked()){    System.out.print("Checked");   }  TreeItem []child=tia[i].getItems();  for(int n=0;n<child.length;n++)   if(child[n].getChecked())    System.out.print("Checked");    }以上的代码只能用在仅有一层子项目的tree上。多层的tree需要循环运算来处理。SWT.CHECK样式的Tree对象在你需要让用户对Tree作出多重选取但又不想要SWT.MULTI模式的额外成本的时候是合适的（但若是要使用选取出的TreeItem来采取某些像是产生list内容这样的动作时则不适用） */protected void buttonPressed(int buttonId) {if (buttonId == IDialogConstants.OK_ID) {TreeItem[] treeitem = tree.getItems();for (int i = 0; i < treeitem.length; i++) {if (treeitem[i].getChecked()) {if (treeitem[i].getChecked()) {File file = (File) treeitem[i].getData();resultFile.append(file.getPath()).append(";");}}TreeItem[] child = treeitem[i].getItems();for (int n = 0; n < child.length; n++)if (child[n].getChecked()) {File file = (File) child[n].getData();resultFile.append(file.getPath()).append(";");}}System.out.println(resultFile.toString());}super.buttonPressed(buttonId);}/** * 设置 message *  * @return */public String getMessage() {return message;}/** * 获取message *  * @param message */public void setMessage(String message) {this.message = message;}/** * @return */public StringBuilder getResultFile() {return resultFile;}/** * @param resultFile */public void setResultFile(StringBuilder resultFile) {this.resultFile = resultFile;}public static void main(String[] args) {final Display display = Display.getDefault();final Shell shell = new Shell(display, SWT.ON_TOP | SWT.CLOSE);shell.setSize(327, 253);Dialog dialog = new MultiDirectoryDialog(shell);if (dialog.open() == IDialogConstants.OK_ID) {// 是否单击“确定”按钮System.out.println("helo");}shell.open();while (!shell.isDisposed()) {if (!display.readAndDispatch())display.sleep();}display.dispose();}}