我应该如何防止Tab键激活我的单选按钮，但它仍然应该能够专注于单选按钮的文本

时间：2013-10-30 22:23:17

标签： java user-interface swt

当我通过swt中的向导对话框进行选项卡时，该对话框包含文本框，单选按钮，按钮。问题是每当我通过一个看起来像（）radioText的禁用单选按钮，这就像这个（。）：radioText：一样被激活，以及这个单选按钮，有2个文本框，当标签时的行为相同单击键。那么选项卡应该关注单选按钮但是不应该激活它的方式是什么，我的意思是从（）radioText状态到（。）radioText状态。有人可以分享他们实施这一目标的经验。

4 个答案:

答案 0 :(得分：0)

我有一个丑陋的解决方案，但它确实有效。

您可以在其前面放置另一个隐藏控件，而不是让焦点直接进入单选按钮。在我的情况下，我使用了画布。当该控件获得焦点时，选择其后的单选按钮，将焦点设置为第一个单选按钮，然后将选择还原为以前的选择。这适用于前向遍历。对于向后（CTRL + TAB），您必须在单选按钮后使用隐藏控件执行相同操作。

请注意，使用此解决方案，可以在制表符遍历期间触发选择侦听器。但在此之后，选择将像以前一样。

这是一个执行此操作的小片段。它只能在前进模式下工作，并且画布并不是真正隐藏的。您必须为您修复布局。

public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setLayout(new GridLayout(1, false));

    new Button(shell, SWT.TOGGLE);
    new Scale(shell, SWT.HORIZONTAL);

    final Canvas invisible = new Canvas(shell, SWT.NONE);
    invisible.addListener(SWT.KeyDown, new Listener() {
        @Override
        public void handleEvent(Event event) {
        }
    });

    final Button radioButton1 = new Button(shell, SWT.RADIO);
    radioButton1.setText("text1");

    final Button radioButton2 = new Button(shell, SWT.RADIO);
    radioButton2.setText("text2");

    invisible.addFocusListener(new FocusListener() {
        @Override
        public void focusGained(FocusEvent e) {
            final boolean selection1 = radioButton1.getSelection();
            final boolean selection2 = radioButton2.getSelection();
            radioButton1.setFocus();
            radioButton1.setSelection(selection1);
            radioButton2.setSelection(selection2);
        }

        @Override
        public void focusLost(FocusEvent e) {
        }
    });

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

答案 1 :(得分：0)

此答案适用于单选按钮后面有文本字段的情况。在其他情况下，我可以使用其他答案。它并不完美，而且非常难看，但也许它可以解决你的问题。

除了内部状态，我将选择值保留为数据（setData()）并在每次选择事件后更新官方选择。

以下是完整代码段：

public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());

    final Composite composite = new Composite(shell, SWT.NO_RADIO_GROUP);
    composite.setLayout(new GridLayout(2, false));

    new Button(composite, SWT.TOGGLE);
    new Scale(composite, SWT.HORIZONTAL);

    final Button radioButton1 = new Button(composite, SWT.RADIO);
    radioButton1.setText("text1");
    radioButton1.setData("selection", false);
    new Text(composite, SWT.SINGLE);

    final Button radioButton2 = new Button(composite, SWT.RADIO);
    radioButton2.setText("text2");
    radioButton2.setData("selection", false);
    new Text(composite, SWT.SINGLE);

    final Button[] radioGroup = {radioButton1, radioButton2};

    final Listener listener = new Listener() {
        @Override
        public void handleEvent(Event event) {
            final Button button = (Button) event.widget;
            switch (event.type) {
                case SWT.MouseDown:
                    event.widget.setData("selection", true);
                    break;
                case SWT.KeyDown:
                    if (event.keyCode == SWT.SPACE) {
                        event.widget.setData("selection", true);
                    }
                    break;
                case SWT.Selection:
                    final boolean selection = (boolean) button.getData("selection");
                    if (selection != button.getSelection()) {
                        button.setSelection(selection);
                    }
                    if (selection) {
                        for (Button radioButton : radioGroup) {
                            if (radioButton != button) {
                                radioButton.setData("selection", false);
                                radioButton.setSelection(false);
                            }
                        }
                    }
                    break;
            }
        }
    };
    radioButton1.addListener(SWT.MouseDown, listener);
    radioButton1.addListener(SWT.KeyDown, listener);
    radioButton1.addListener(SWT.Selection, listener);
    radioButton2.addListener(SWT.MouseDown, listener);
    radioButton2.addListener(SWT.KeyDown, listener);
    radioButton2.addListener(SWT.Selection, listener);

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

答案 2 :(得分：0)

package myexamples;

import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.wb.swt.layout.grouplayout.GroupLayout;
import org.eclipse.wb.swt.layout.grouplayout.LayoutStyle;
import org.eclipse.swt.widgets.Combo;

public class MySample {
    private static Text text;
    private static Text text_1;
    private static Text text_2;

    /**
     * Launch the application.
     * @param args
     */
    public static void main(String[] args) {
        Display display = Display.getDefault();
        Shell shell = new Shell();

        Composite composite = new Composite(shell, SWT.NONE);
        composite.setBounds(197, 177, 393, 110);
        composite.setLayout(new GridLayout(2, false));
        new Label(composite, SWT.NONE);
        new Label(composite, SWT.NONE);

        Button btnButton = new Button(composite, SWT.RADIO);
        btnButton.setText(" Button1");

        Composite composite_1 = new Composite(composite, SWT.NONE);
        composite_1.setLayout(new GridLayout(4, false));
        GridData gd_composite_1 = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
        gd_composite_1.heightHint = 37;
        gd_composite_1.widthHint = 306;
        composite_1.setLayoutData(gd_composite_1);

        text = new Text(composite_1, SWT.BORDER);
        text.setSize(new Point(10, 8));
        GridData gd_text = new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1);
        gd_text.widthHint = 72;
        text.setLayoutData(gd_text);

        Label lblLabel = new Label(composite_1, SWT.NONE);
        lblLabel.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));
        lblLabel.setText("Label2");

        text_1 = new Text(composite_1, SWT.BORDER);
        text_1.setSize(new Point(12, 8));
        GridData gd_text_1 = new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1);
        gd_text_1.widthHint = 60;
        text_1.setLayoutData(gd_text_1);

        Label lblLabel_1 = new Label(composite_1, SWT.NONE);
        lblLabel_1.setText(" Label3");
        new Label(composite_1, SWT.NONE);
        new Label(composite_1, SWT.NONE);
        new Label(composite_1, SWT.NONE);
        new Label(composite_1, SWT.NONE);

        Button btnButton_1 = new Button(composite, SWT.RADIO);
        btnButton_1.setText(" Button2");

        Composite composite_2 = new Composite(composite, SWT.NONE);
        composite_2.setLayout(new GridLayout(5, false));
        GridData gd_composite_2 = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
        gd_composite_2.widthHint = 305;
        gd_composite_2.heightHint = 30;
        composite_2.setLayoutData(gd_composite_2);

        Combo combo = new Combo(composite_2, SWT.NONE);
        combo.setSize(new Point(10, 8));
        combo.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
        combo.setEnabled(false);
        Combo combo_1 = new Combo(composite_2, SWT.NONE);
        combo_1.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
        combo_1.setEnabled(false);
        Label lblLabelxyz = new Label(composite_2, SWT.NONE);
        lblLabelxyz.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false, 1, 1));
        lblLabelxyz.setText("LabelXYZ1");

        text_2 = new Text(composite_2, SWT.BORDER);
        text_2.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));

        Label lblLabelxyz_1 = new Label(composite_2, SWT.NONE);
        lblLabelxyz_1.setText("LabelXYZ2");
        text_2.setEnabled(false);
        Label label = new Label(shell, SWT.NONE);
        label.setBounds(62, 112, 55, 15);
        label.setText("");
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
    }
}

答案 3 :(得分：0)

在表单中，如果您想向用户提问并且该问题需要是/否答案，那么显示空选项会很好。

此外，如果用户无法提供答案，则更清楚，因为他可以清楚地看到表格中遗漏了什么。

这确实需要调整（如上面的答案所示）。我通过添加第三个按钮来实现它，我将人工隐藏并获得初始选择（即＆＃34; true＆＃34;值）。

Composite c = toolkit.createComposite(parent);
c.setLayout(new RowLayout());

yesButton = toolkit.createButton(c, "Yes", SWT.RADIO);
noButton = toolkit.createButton(c, "No", SWT.RADIO);

yesButton.setSelection(false);
noButton.setSelection(false);

hiddenButton = toolkit.createButton(c, "", SWT.RADIO);
hiddenButton.setSelection(true);
hiddenButton.addPaintListener(new PaintListener() {
    @Override
    public void paintControl(PaintEvent paintevent) {
        // before you paint, shrink the button size to zero
        ((Button)paintevent.widget).setSize(0, 0);
    }
});

诀窍是你无法使用setVisible（false）隐藏按钮，否则，行中的下一个按钮将获得选择。

要解决这个问题，你可以通过截取按钮上的PaintEvents来强制组件的大小为零

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