在 swt 中为多行文本设置要显示的行数

问题描述：

我正在为 TextArea 使用以下内容

I am using following for TextArea

ToolBar bar = new ToolBar(box,SWT.NONE);
ToolItem item = new ToolItem(bar, SWT.SEPARATOR);
Text text = new Text(bar, SWT.BORDER | SWT.MULTI);
item.setWidth(width);
item.setControl(text);

GridData data = new GridData();
data.verticalAlignment = SWT.CENTER;
data.grabExcessHorizontalSpace = true;
data.grabExcessVerticalSpace = true;
text.setLayoutData(data);

我想显示一个多行文本框，目前它接受多行文本但一次只显示一行.

I want to display a multi line text box, currently its accepting multi line text but showing only a single line at a time.

知道如何设置要显示的行数吗?

Any idea how to set the number of rows to be displayed ?

谢谢.

答

您可以以像素为单位设置高度:

You can set the height in pixels:

/* Set the height to 75 pixels */
data.heightHint = 75;

但是，您也可以根据字符行数设置高度，但是您必须做一些技巧来测量字符高度.您需要构建一个图形上下文 (GC) 来测量文本范围.

However, you can also set the height in terms of the number of character rows, but you have to do some trickery to measure the character height. You'll need to build a graphics context (GC) to measure the text extent.

例如:

GC gc = new GC(text);
try
{
    gc.setFont(text.getFont());
    FontMetrics fm = gc.getFontMetrics();

    /* Set the height to 5 rows of characters */
    data.heightHint = 5 * fm.getHeight();
}
finally
{
    gc.dispose();
}

在 swt 中为多行文本设置要显示的行数

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