SWT 组合框 - ITeye问答

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SWT 组合框20

各位大虾
    我想用SWT做一个类似百度和谷歌那样的自动提示组合框，但是冥思苦想了好几周，都束手无策，我用Text和Menu组合，Text和List组合，但效果都不理想，每当我用弹出Menu和List后，Text都失去了焦点，没有办法再书写下去，请大虾们帮帮我，如何才能帮它给做出来，我在这里先谢谢了。下面是我用Text和Menu的组合，请大虾们指点一下，谢谢。
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.KeyAdapter;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.TraverseEvent;
import org.eclipse.swt.events.TraverseListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
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 MyCombo extends Composite {
private Text text;
private Menu popupMenu = null;
public MyCombo(Composite parent1, int style) {
super(parent1, style);
init();

}

public void init() {
setLayout(new GridLayout(1, false));

text = new Text(this, SWT.BORDER);
initMenu();
text.addKeyListener(new KeyAdapter() {

public void keyPressed(KeyEvent e) {

}

public void keyReleased(KeyEvent e) {
e.doit = false;

int keyCode = e.keyCode;
if (keyCode == 13) {
popupMenu.setVisible(false);
}else {
Text text = (Text)e.getSource();
Point p = text.getParent().toDisplay(text.getLocation());
Point size = text.getSize();
Rectangle shellRect = new Rectangle(p.x, p.y + size.y, size.x, 0);
popupMenu.setLocation(shellRect.x,shellRect.y);
popupMenu.setVisible(true);
}
System.out.println(keyCode);

}
});
text.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 1, 1));
text.addTraverseListener(new TraverseListener(){

public void keyTraversed(TraverseEvent e) {
e.doit = false;
e.detail = SWT.TRAVERSE_NONE;
}

});
}

private void initMenu(){

popupMenu = new Menu(text);

    MenuItem newItem = new MenuItem(popupMenu, SWT.CASCADE);
    newItem.setText("New");
    MenuItem refreshtem = new MenuItem(popupMenu, SWT.NONE);
    refreshtem.setText("Refresh");
    MenuItem deleteItem = new MenuItem(popupMenu, SWT.NONE);
    deleteItem.setText("Delete");

    Menu newMenu = new Menu(popupMenu);
    newItem.setMenu(newMenu);

    MenuItem shortcutItem = new MenuItem(newMenu, SWT.NONE);
    shortcutItem.setText("Shortcut");
    MenuItem iconItem = new MenuItem(newMenu, SWT.NONE);
    iconItem.setText("Icon");

    text.setMenu(popupMenu);


}

public static void main(String[] args) {
final Display display = Display.getDefault();
        final Shell shell = new Shell();
        FillLayout layout = new FillLayout();
        layout.marginHeight = 20;
        layout.marginWidth = 20;
        shell.setLayout(layout);
        shell.setSize(201, 183);
        shell.setText("组合框演示");
        //

        shell.open();

        final MyCombo combo = new MyCombo(shell, SWT.DROP_DOWN);

        combo.setBounds(10, 10, 173, 21);
        Menu menu = combo.getMenu();
        String[] items = new String[4];
        for (int i = 0; i < items.length; i++) {
            items[i] = "选项" + i;
        }
       // combo.setItems(items);

       /* combo.addKeyListener(new KeyAdapter(){
                public void keyPressed(KeyEvent e){
                        if (e.keyCode==SWT.ARROW_LEFT) {
                            combo.select(combo.getSelectionIndex()-1);

                        }
                        if(e.keyCode==SWT.ARROW_RIGHT){
                            combo.select(combo.getSelectionIndex()+1);
                        }
                }
        });    */

        shell.layout();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
    }
}

问题补充：不好意思，你写的不是我想要的，我需要的是通过在Text里面输入，然后弹出List，并且不让Text失去焦点。不过还是谢谢你

问题补充：

songfantasy 写道

SWT没有用过。sorry

其实只要能用程序使得Combo的下拉菜单能弹出来也可以。

Java综合

2010年9月29日 21:47

bloveyao
5
0 0 0

2个答案按时间排序按投票排序

0 0

用list 写了一个。看与你意思一样否。

public class Combo_baidu {   
    private static Text text;   
    private static List list;   
  
    public static void main(String[] args) {   
        final Display display = Display.getDefault();       
        final Shell shell = new Shell();   
        shell.setSize(400, 300);    
  
        text = new Text(shell, SWT.BORDER);   
        text.setBounds(10, 10, 200, 20);   
        text.addKeyListener(new KeyAdapter() {   
            public void keyReleased(KeyEvent e) {   
                if(e.keyCode == SWT.ARROW_UP || e.keyCode == SWT.ARROW_DOWN) {   
                    int s = list.getSelectionIndex();   
                    if(e.keyCode == SWT.ARROW_UP) {   
                        s--;   
                    } else {   
                        s++;   
                    }   
                    if(s>=0 && s<list.getItemCount()) {   
                        list.setSelection(s);   
                        text.setText(list.getSelection()[0]);   
                        text.setSelection(text.getCharCount());   
                    }   
                }   
            }   
        });   
  
        list = new List(shell, SWT.BORDER | SWT.SINGLE);   
        for(int i=0; i<10; i++) {   
            list.add("The item "+i+" .");   
        }   
        list.setBounds(10, 30, 200, 200);   
  
        shell.open();   
        while (!shell.isDisposed()) {       
            if (!display.readAndDispatch())       
                display.sleep();       
        }   
    }   
  
}

效果图：