如何更改JLabel的字体大小以获取最大大小 [英] How to change the size of the font of a JLabel to take the maximum size
问题描述
字体的默认大小非常小。
我希望JLabel的文本能够最大化。
我该怎么做?
感谢:)
不是最漂亮的代码,但是下面的代码会为 JLabel
调用 label
,这样内部的文本就可以尽可能地适合内部而不会溢出标签:
Font labelFont = label.getFont();
String labelText = label.getText();
int stringWidth = label.getFontMetrics(labelFont).stringWidth(labelText);
int componentWidth = label.getWidth();
//找出字体的宽度可以增长多少。
double widthRatio =(double)componentWidth /(double)stringWidth;
int newFontSize =(int)(labelFont.getSize()* widthRatio);
int componentHeight = label.getHeight();
//选择一个新的字体大小,使其不会大于标签的高度。
int fontSizeToUse = Math.min(newFontSize,componentHeight);
//将标签的字体大小设置为新确定的大小。
label.setFont(new Font(labelFont.getName(),Font.PLAIN,fontSizeToUse));
基本上,代码看起来在 JLabel
占用使用 FontMetrics
对象,然后使用该信息来确定可以使用的最大字体大小,而不会溢出来自 JLabel
的文本。
上面的代码可以插入到 JFrame
的 paint 它包含
JLabel
,或者当字体大小需要改变的时候调用的方法。
以下是上述代码的截图:
替代文字http://coobird.net/img/growing-text.png
I have a JLabel in a Container. The defaut size of the font is very small. I would like that the text of the JLabel to take the maximum size.
How can I do that ? Thanks :)
Not the most pretty code, but the following will pick an appropriate font size for a JLabel
called label
such that the text inside will fit the interior as much as possible without overflowing the label:
Font labelFont = label.getFont();
String labelText = label.getText();
int stringWidth = label.getFontMetrics(labelFont).stringWidth(labelText);
int componentWidth = label.getWidth();
// Find out how much the font can grow in width.
double widthRatio = (double)componentWidth / (double)stringWidth;
int newFontSize = (int)(labelFont.getSize() * widthRatio);
int componentHeight = label.getHeight();
// Pick a new font size so it will not be larger than the height of label.
int fontSizeToUse = Math.min(newFontSize, componentHeight);
// Set the label's font size to the newly determined size.
label.setFont(new Font(labelFont.getName(), Font.PLAIN, fontSizeToUse));
Basically, the code looks at how much space the text in the JLabel
takes up by using the FontMetrics
object, and then uses that information to determine the largest font size that can be used without overflowing the text from the JLabel
.
The above code can be inserted into perhaps the paint
method of the JFrame
which holds the JLabel
, or some method which will be invoked when the font size needs to be changed.
The following is an screenshot of the above code in action:
alt text http://coobird.net/img/growing-text.png
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