如何为SWT对话框合并和验证两个文本字段？ [英] How to combine and validate two text fields for a swt dialog?

问题描述

我还有一个问题。我使用ModifyListener一个文本框来激活，并在SWT对话框停用OK-按钮。它的伟大工程。

i have another question. I use a ModifyListener for one textfield to activate and deactivate the OK-Button in a swt dialog. It works great.

现在我想添加一个ModifyListener另一个文本框。我想，如果在这两个文本字段是分一个字符的OK-按键仅被激活。

Now I want to add a ModifyListener for another textfield. I want that the OK-Button only is activated if in both text fields is min one char.

这是两个领域的code：

This is the code of the two fields:

descriptionText.addModifyListener(new ModifyListener(){

    public void modifyText(ModifyEvent e) {
        Text text = (Text) e.widget;

        if (text.getText().length() == 0) {

            getButton(IDialogConstants.OK_ID).setEnabled(false);
        }

        if (text.getText().length() >= 1) {

            getButton(IDialogConstants.OK_ID).setEnabled(true);
        }
    }
});

}

第二个字段：

ccidText.addModifyListener(new ModifyListener(){

        public void modifyText(ModifyEvent e) {
            Text text = (Text) e.widget;

            if (text.getText().length() == 0) {
        getButton(IDialogConstants.OK_ID).setEnabled(false);

            }
            if (text.getText().length() >= 1){              
                    getButton(IDialogConstants.OK_ID).setEnabled(true);
            }
        }
    });
}

我知道这doesn't工作，因为有两个按键之间没有相关性。
我怎样才能结合起来？

I know that it doesn´t work because there are no dependencies between the two buttons. How can i combine it?

我想设置OK按钮假，而这两个modifylistener检测字符。
如果我在一个testfield删除所有字符的按钮必须重新激活。

I want to set the ok-button false while both modifylistener detect a char. If i delete all chars in one testfield the button must be deactivated again.

感谢ü。

推荐答案

您可以使用相同的监听器为文本字段，添加了 SWT.KeyUp ：

You can use the same Listener for both Text fields and add it for SWT.KeyUp:

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

    final Text first = new Text(shell, SWT.BORDER);
    final Text second = new Text(shell, SWT.BORDER);
    final Button button = new Button(shell, SWT.PUSH);
    button.setText("disabled");
    button.setEnabled(false);

    Listener listener = new Listener()
    {
        @Override
        public void handleEvent(Event e)
        {
            String firstString = first.getText();
            String secondString = second.getText();

            button.setEnabled(!isEmpty(firstString) && !isEmpty(secondString));
            button.setText(button.isEnabled() ? "enabled" : "disabled");
        }
    };

    first.addListener(SWT.KeyUp, listener);
    second.addListener(SWT.KeyUp, listener);

    shell.pack();
    shell.setSize(300, shell.getSize().y);
    shell.open();

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

private static boolean isEmpty(String input)
{
    if(input == null)
        return true;
    else
        return input.trim().isEmpty();
}

是这样的：

在code基本上都会（在每个键中风）检查，如果这两个文本是空的。如果是这样，禁用按钮，否则启用它。

The code will basically (on each key stroke) check if both Texts are empty. If so, disable the Button, else enable it.

这篇关于如何为SWT对话框合并和验证两个文本字段？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！