如果文本不适合JLabel，我想减小字体大小 [英] I want to decrease the font size if text doesn't fit in JLabel

问题描述

关于这个问题有很多帖子，但我不明白那里的人给出的答案。
喜欢在这篇文章中：如何更改JLabel的字体大小以获取最大大小答案将字体大小转换为14！但这是静态的，还有其他的答案。他们的整个输出屏幕似乎增加。

我显示一个名为lnum的JLabel中的某些数字，它可以显示数字高达3位数字，但之后显示为4 ...我想，如果数字能够适应标签，它不应该改变它的字体大小，但如果像一个数字是4位数字，它应该减少字体大小，以适合的方式。注意：我不希望jLabel的尺寸发生变化。我只是想改变它的文字。

编辑：
下面是我试过的代码

  String text = lnum.getText（）; 
 System.out.println（String Text =+ text）; // DEBUG 
字体originalFont =（Font）lnum.getClientProperty（originalfont）; //从客户端属性获取原始字体
 if（originalFont == null）{//第一次我们调用它：添加
 originalFont = lnum.getFont（）; 
 lnum.putClientProperty（originalfont，originalFont）; 
} 
 int stringWidth = lnum.getFontMetrics（originalFont）.stringWidth（text）; 
 
 int componentWidth = lnum.getWidth（）; 
 stringWidth = stringWidth + 25; // DEBUG TRY 
 if（stringWidth> componentWidth）{//只在需要的时候调整大小
 //查看字体宽度可以缩小多少。 
 double widthRatio =（double）componentWidth /（double）stringWidth; 
 
 int newFontSize =（int）Math.floor（originalFont.getSize（）* widthRatio）; //保持最小大小
 
 //将标签的字体大小设置为新确定的大小。 
 lnum.setFont（new Font（originalFont.getName（），originalFont.getStyle（），newFontSize））; 
} else {
 lnum.setFont（originalFont）; / /调试
} 
 lnum.setText（text）; / /调试
 
  

我有一个问题，很多次它不起作用，就像文本是 28885显示-28 ...。

stringWidth = stringWidth + 25; // DEBUG TRY

我不得不添加这段代码，以增加它的长度。这是一个代码，我只是暂时解决这个问题。我想要一个永久的解决方案。 解决方案

改编自您提到的问题的答案：

  void setTextFit（JLabel label，String text ）{
 Font originalFont =（Font）label.getClientProperty（originalfont）; //从客户端属性获取原始字体
 if（originalFont == null）{//第一次我们调用它：添加它
 originalFont = label.getFont（）; 
 label.putClientProperty（originalfont，originalFont）; 
} 
 
 int stringWidth = label.getFontMetrics（originalFont）.stringWidth（text）; 
 int componentWidth = label.getWidth（）; 
 
 if（stringWidth> componentWidth）{//只在需要时调整大小
 //查看字体宽度可以缩小多少。 
 double widthRatio =（double）componentWidth /（double）stringWidth; 
 
 int newFontSize =（int）Math.floor（originalFont.getSize（）* widthRatio）; //保持最小大小
 
 //将标签的字体大小设置为新确定的大小。 
 label.setFont（new Font（originalFont.getName（），originalFont.getStyle（），newFontSize））; 
} else 
 label.setFont（originalFont）; //文字适合，不要改变字体大小
 
 label.setText（text）; 
 
 
 
 
 
 $ b当你显示一个合适的数字时，你应该重置字体（见 else 部分）。
 
 
 
编辑：如果你不行/不行要保留对原始Font的引用，可以将其保存为客户端属性（请参阅​​第一行）。
There were many posts regarding this problem, but i couldn't understand the answers given by people in there.
Like in this post: "How to change the size of the font of a JLabel to take the maximum size" the answer converts the font size to 14! But that is static and further in other answers; their whole output screen seems to increase.

I display certain numbers in a JLabel named "lnum", it can show numbers upto 3 digits but after that it shows like "4..." I want that if the number is able to fit in the label, it should not change its font size but if like a number is 4 digit, it should decrease the font size in such a way that it fits. NOTE: i do not want that the dimensions of the jLabel change. I just want to change the text in It. 

Edit:
Here is what code i tried
String text = lnum.getText();        
System.out.println("String Text = "+text);//DEBUG
Font originalFont = (Font)lnum.getClientProperty("originalfont"); // Get the original Font from client properties            
 if (originalFont == null) { // First time we call it: add it
        originalFont = lnum.getFont();
        lnum.putClientProperty("originalfont", originalFont);
    }
 int stringWidth = lnum.getFontMetrics(originalFont).stringWidth(text);       

 int componentWidth = lnum.getWidth();
 stringWidth = stringWidth + 25; //DEBUG TRY
 if (stringWidth > componentWidth) { // Resize only if needed
        // Find out how much the font can shrink in width.
        double widthRatio = (double)componentWidth / (double)stringWidth;

        int newFontSize = (int)Math.floor(originalFont.getSize() * widthRatio); // Keep the minimum size

        // Set the label's font size to the newly determined size.
        lnum.setFont(new Font(originalFont.getName(), originalFont.getStyle(), newFontSize));
    }else{
        lnum.setFont(originalFont); // Text fits, do not change font size
        System.out.println("I didnt change it hahaha");//DEBUG 
 }
    lnum.setText(text);
I have a problem that many a times it doesn't work, like if the text is "-28885" it shows "-28...".

stringWidth = stringWidth + 25; //DEBUG TRY

I had to add this code so that it increases the length that it gets. It was a code i added to just temporarly fix the problem. I want a permanent solution for this.
解决方案
Adapted from an answer on the question you referred to:
void setTextFit(JLabel label, String text) {
    Font originalFont = (Font)label.getClientProperty("originalfont"); // Get the original Font from client properties
    if (originalFont == null) { // First time we call it: add it
        originalFont = label.getFont();
        label.putClientProperty("originalfont", originalFont);
    }

    int stringWidth = label.getFontMetrics(originalFont).stringWidth(text);
    int componentWidth = label.getWidth();

    if (stringWidth > componentWidth) { // Resize only if needed
        // Find out how much the font can shrink in width.
        double widthRatio = (double)componentWidth / (double)stringWidth;

        int newFontSize = (int)Math.floor(originalFont.getSize() * widthRatio); // Keep the minimum size

        // Set the label's font size to the newly determined size.
        label.setFont(new Font(originalFont.getName(), originalFont.getStyle(), newFontSize));
    } else
        label.setFont(originalFont); // Text fits, do not change font size

    label.setText(text);
}
When you'll display a number that would fit, you should reset the Font back to its original (see the else part).

EDIT: If you can't/don't want to keep a reference to the original Font, you can save it as a "client property" (see the first lines).

                        
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