如何根据孩子的身高自动设置对话框的身高?

时间:2019-06-20 18:53:55

标签: java swt composite

我有一个对话框,可以使用更多或更少的文本来调用。现在,我将静态设置对话框的高度,将高度设置为200。

shell.setSize(450, 200);    

问题是,当我向对话框中传递很小的文本时,显示的内容带有很多空白,而当我向对话框中传递长文本时,高度不够。

在Android中,这非常简单,您可以将WRAP_CONTENT设置为布局的高度,然后将其包装为其子代的高度。

在SWT中如何做到?

这是我的对话框:

public class ConfirmDialog extends Dialog {
    protected boolean[] result;
    protected Shell shell;
    private String message;
    private String checkboxMessage;
    private Button btnCheckButton;

    /**
     * Create the dialog.
     * @param parent
     * @param style
     */
    public ConfirmDialog(Shell parent, int style, String message, String checkboxMessage) {
        super(parent, style);
        setText("Confirmación");
        this.message = message;
        this.checkboxMessage = checkboxMessage;
    }

    /**
     * Open the dialog.
     * @return the result
     */
    public boolean[] open() {
        createContents();

        result = new boolean[2];

        Rectangle parentSize = getParent().getBounds();
        Rectangle shellSize = shell.getBounds();
        int x = parentSize.x + (parentSize.width - shellSize.width) / 2;
        int y = (int) (parentSize.y + (parentSize.height - shellSize.height) / 3.5);
        shell.setLocation(new Point(x, y));
        shell.setLayout(new GridLayout(1, false));

        Composite contentComposite = new Composite(shell, SWT.NONE);
        contentComposite.setLayout(new GridLayout(1, false));
        contentComposite.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, true, true, 1, 1));

        Label lblText = new Label(contentComposite, SWT.WRAP | SWT.CENTER);
        lblText.setLayoutData(new GridData(SWT.LEFT, SWT.CENTER, true, false, 1, 1));
        lblText.setText(message);

        if (checkboxMessage != null) {
            Composite composite_2 = new Composite(shell, SWT.NONE);
            composite_2.setLayout(new GridLayout(1, false));
            composite_2.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, true, true, 1, 1));

            btnCheckButton = new Button(composite_2, SWT.CHECK);
            btnCheckButton.setText(checkboxMessage);
            btnCheckButton.setSelection(true);
        }

        Composite buttonsComposite = new Composite(shell, SWT.NONE);
        GridLayout gl_buttonsComposite = new GridLayout(2, false);
        gl_buttonsComposite.horizontalSpacing = 50;
        buttonsComposite.setLayout(gl_buttonsComposite);
        GridData gd_buttonsComposite = new GridData(SWT.CENTER, SWT.CENTER, false, false, 1, 1);
        gd_buttonsComposite.heightHint = 45;
        buttonsComposite.setLayoutData(gd_buttonsComposite);

        Button acceptButton = new Button(buttonsComposite, SWT.NONE);
        GridData gd_acceptButton = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
        gd_acceptButton.widthHint = 75;
        acceptButton.setLayoutData(gd_acceptButton);
        acceptButton.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                result[0] = true;
                if (btnCheckButton != null) {
                    result[1] = btnCheckButton.getSelection();
                }
                shell.close();
            }
        });
        acceptButton.setBounds(0, 0, 75, 25);
        acceptButton.setText("Sí");

        Button cancelButton = new Button(buttonsComposite, SWT.NONE);
        GridData gd_cancelButton = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
        gd_cancelButton.widthHint = 75;
        cancelButton.setLayoutData(gd_cancelButton);
        cancelButton.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                shell.close();
            }
        });
        cancelButton.setBounds(0, 0, 75, 25);
        cancelButton.setText("No");

        shell.setDefaultButton(cancelButton);

        shell.open();
        shell.layout();
        Display display = getParent().getDisplay();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }

        return result;
    }

    /**
     * Create contents of the dialog.
     */
    private void createContents() {
        shell = new Shell(getParent(), getStyle());
        shell.setSize(450, 200);        
        shell.setText(getText());
    }
}

如果我尝试执行shell.pack(),结果将是一个超小的方形对话框,其中只有一个按钮可见,而取消按钮不可见,文本也不可见。因此shell.pack()无法正常工作,也不知道为什么:

enter image description here

1 个答案:

答案 0 :(得分:2)

致电shell.setSize而不是shell.pack()。这会将大小设置为由外壳中的布局计算的值。 pack等同于

shell.setSize(shell.computeSize(SWT.DEFAULT, SWT.DEFAULT, true));

另外,您正在将布局(GridLayout等与setBounds混合-请勿这样做。布局将覆盖边界,仅使用布局即可。

在设置完外壳程序的所有内容之后,应在pack之后调用

layout

您可以根据计算出的大小来调整外壳大小,方法是将pack调用替换为以下内容:

Point size = shell.computeSize(SWT.DEFAULT, SWT.DEFAULT, true);

if (size.x > ?????)
  size.x = ????;

shell.setSize(size);

但是这只会截断对话框。如果要滚动,则必须使用ScrolledComposite之类的东西。

要使标签换行,您需要为其布局数据指定widthHint

Label lblText = new Label(contentComposite, SWT.WRAP | SWT.CENTER);

GridData data = new GridData(SWT.LEFT, SWT.CENTER, true, false, 1, 1);
data.widthHint = 100;  // Maximum width here
lblText.setLayoutData(data);

lblText.setText(message);