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java - 如何使 For 循环中的控件可见？

问题描述

除了数字（即'grp1'、'grp2'、'grp3'）之外，我有三个同名的SWT 组控件。我想在 for 循环中显示组控件；为此，我创建了一个包含 Group 控件的数组。

这是代码：

Group [] grpArray = new Group[3];
    grpArray[0] = grp1;
    grpArray[1] = grp2;
    grpArray[2] = grp3;

    txtLvl = new Text(composite, SWT.BORDER | SWT.READ_ONLY);

    txtLvl.addModifyListener(new ModifyListener() {
        public void modifyText(ModifyEvent e) {

            for (int i = 1; i <= Integer.parseInt(txtLvl.getText()); i++) {

                grpArray[i-1].setVisible(true);


            }
            }

        }
    );

这是错误代码：

at it.anabasibdg.viste.AnagPdc$4.modifyText(AnagPdc.java:296)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Text.wmCommandChild(Unknown Source)
at org.eclipse.swt.widgets.Control.WM_COMMAND(Unknown Source)
at org.eclipse.swt.widgets.Control.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Display.windowProc(Unknown Source)
at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.CallWindowProc(Unknown Source)
at org.eclipse.swt.widgets.Text.callWindowProc(Unknown Source)
at org.eclipse.swt.widgets.Control.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Text.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Display.windowProc(Unknown Source)
at org.eclipse.swt.internal.win32.OS.SetWindowTextW(Native Method)
at org.eclipse.swt.internal.win32.OS.SetWindowText(Unknown Source)
at org.eclipse.swt.widgets.Text.setText(Unknown Source)
at it.anabasibdg.viste.AnagPdc$3.widgetSelected(AnagPdc.java:213)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at it.anabasibdg.viste.Main.open(Main.java:58)
at it.anabasibdg.viste.LoginForm$3.widgetSelected(LoginForm.java:191)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at it.anabasibdg.viste.LoginForm.open(LoginForm.java:110)
at it.anabasibdg.viste.LoginForm$1.run(LoginForm.java:59)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at it.anabasibdg.viste.LoginForm.main(LoginForm.java:55)

标签： javaeclipse

解决方案

我刚刚以这种方式解决了我的问题：

private ArrayList<Group> grpArray1 = new ArrayList<Group>();


    txtLvl.addModifyListener(new ModifyListener() {
        public void modifyText(ModifyEvent e) {

            groupArray(grp1, grp2,grp3);

            for (Group grp : grpArray1) {

                grp.setVisible(true);

            }


    public void groupArray(Group... c) {

    for (Group group : c) {

        grpArray1.add(group);

    }

}

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