JFace对文本框的自动完成和内容助理小结

Posted 2020-10-26 墨梅一点清

自动填充有两种

TextContentAdapter 只能用于Text文本框

ComboContentAdapter 只能用于Combo下拉框

AutoCompleteField和ContentProposalAdapter的区别

• AutoCompleteField用于自动完成，例如你输入“山”这个字的时候，可以快速选择输入“山东”或者“山西”。
• ContentProposalAdapter则用于内容建议，你输入“山西”的时候，按下快捷键或者特定字符，会给你“省”、“市”、“自治区”等建议

另外，还可以以给文本框加菜单的形式实现固定输入，在特定监听下，显示某些菜单，然后以此菜单的功能来输入内容。

import org.eclipse.jface.fieldassist.AutoCompleteField;
import org.eclipse.jface.fieldassist.ComboContentAdapter;
import org.eclipse.jface.fieldassist.ContentProposalAdapter;
import org.eclipse.jface.fieldassist.SimpleContentProposalProvider;
import org.eclipse.jface.fieldassist.TextContentAdapter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.FocusAdapter;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class AutoDemo {

    protected Shell shell;
    private Text text;
    private Text text_1;
    private Menu menu;
    private Text text_2;

    /**
     * Launch the application.
     * @param args
     */
    public static void main(String[] args) {
        try {
            AutoDemo window = new AutoDemo();
            window.open();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * Open the window.
     */
    public void open() {
        Display display = Display.getDefault();
        createContents();
        shell.open();
        shell.layout();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
    }

    /**
     * Create contents of the window.
     */
    @SuppressWarnings("deprecation")
    private void createContents() {
        shell = new Shell();
        shell.setSize(332, 160);
        shell.setText("自动完成测试");
        shell.setLayout(new GridLayout(1, false));
        
        text = new Text(shell, SWT.BORDER);
        text.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
        new AutoCompleteField(text, new TextContentAdapter(), new String[] {"山东","山西","河南","河北"});
        
        Combo combo = new Combo(shell, SWT.NONE);
        combo.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
        new AutoCompleteField(combo, new ComboContentAdapter(), new String[] {"山东","山西","河南","河北"});
        
        text_1 = new Text(shell, SWT.BORDER);
        text_1.addFocusListener(new FocusAdapter() {
            @Override
            public void focusGained(FocusEvent e) {
                Point point = text_1.getParent().toDisplay(text_1.getLocation());
                menu.setLocation(point.x, point.y+text_1.getBounds().height);
                menu.setVisible(true);
            }
        });
        text_1.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
        
        menu = new Menu(text_1);
        text_1.setMenu(menu);
        
        MenuItem mntmNewItem = new MenuItem(menu, SWT.NONE);
        mntmNewItem.setText("A");
        
        MenuItem mntmNewItem_1 = new MenuItem(menu, SWT.NONE);
        mntmNewItem_1.setText("B");
        
        new MenuItem(menu, SWT.SEPARATOR);
        
        MenuItem mntmNewSubmenu = new MenuItem(menu, SWT.CASCADE);
        mntmNewSubmenu.setText("C");
        
        Menu menu_1 = new Menu(mntmNewSubmenu);
        mntmNewSubmenu.setMenu(menu_1);
        
        MenuItem mntmNewCheckbox = new MenuItem(menu_1, SWT.CHECK);
        mntmNewCheckbox.setText("D");
        
        MenuItem mntmE = new MenuItem(menu_1, SWT.NONE);
        mntmE.setText("E");
        
        MenuItem mntmF = new MenuItem(menu_1, SWT.NONE);
        mntmF.setText("F");
        
        new MenuItem(menu, SWT.SEPARATOR);
        
        MenuItem mntmNewCheckbox_1 = new MenuItem(menu, SWT.CHECK);
        mntmNewCheckbox_1.setSelection(true);
        mntmNewCheckbox_1.setText("G");
        
        MenuItem mntmNewRadiobutton = new MenuItem(menu, SWT.RADIO);
        mntmNewRadiobutton.setSelection(true);
        mntmNewRadiobutton.setText("H");
        
        text_2 = new Text(shell, SWT.BORDER);
        text_2.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
        
        String[] adviceKey = new String[] {"qq.com","185.com","163.com","126.com","gmail.com","hotmail.com","sina.com","139.com","189.cn"};
        ContentProposalAdapter contentProposalAdapter = new ContentProposalAdapter(text_2, new TextContentAdapter(), new SimpleContentProposalProvider(adviceKey), null, new char[] {‘@‘});
        //设置插入方式，忽略、用内容助理中的全部覆盖文本框中的文本、直接在文本框已有文本后面追加等三种方式
        contentProposalAdapter.setProposalAcceptanceStyle(ContentProposalAdapter.PROPOSAL_INSERT);
        //设置是否传播键，即在已经弹出内容窗口的情况下，用户如果继续输入内容，是否允许继续在文本框输入。
        contentProposalAdapter.setPropagateKeys(true);
        //设置延时，需要弹出内容助理时等待多少毫秒才弹出。
        contentProposalAdapter.setAutoActivationDelay(0);
        //设置输入内容过滤
        //ContentProposalAdapter.FILTER_NONE  永不过滤
        // ContentProposalAdapter.FILTER_CHARACTER 只用一个输入字符为条件过滤下面的内容列表.在输入多个字符后,下面的内容列表会被清空.
        // ContentProposalAdapter.FILTER_CUMULATIVE 随着用户输入不停的过滤下面的内容列表.但是在3.4后被@deprecated了. 想不通这么实用的东西为什么会被弃用掉
        contentProposalAdapter.setFilterStyle(ContentProposalAdapter.FILTER_CUMULATIVE);
        //给弹窗设置合适的大小
        //contentProposalAdapter.setPopupSize(new Point(10,10));
        //如果需要给弹窗中的东西显示图标，则需要设置LabelProvider。
//        contentProposalAdapter.setLabelProvider(new LabelProvider());
        //给弹窗设置快捷键
//        KeyStroke keyStroke = null; // null 表示不接受快捷键
//        try {
//            keyStroke = KeyStroke.getInstance("Ctrl+1"); // 在text上按Ctrl+1弹出popup的shell.
//        } catch (Exception e) {
//            e.printStackTrace();
//        }
    }
}