JLabel 将项目推出屏幕

Question

我正在使用 NetBeans gui 构建器为应用程序设计一个 gui，有一点我想要一个带有进度条、取消按钮和弹出标签的小型 JFrame。标签的文本（居中）有时会显示一些不适合屏幕的长文件名，但它不是不显示溢出的文本，而是占用进度条并拉伸它，以便它的右侧离开屏幕。我认为这与使用 GroupLayout 的 NetBeans 有关，但我不确定。这是生成的构造函数代码：

progressLabel = new javax.swing.JLabel();
cancelBtn = new javax.swing.JButton();
progressBar = new javax.swing.JProgressBar();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

progressLabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);

cancelBtn.setText("Cancel");

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
    layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
        .addContainerGap()
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(progressBar, javax.swing.GroupLayout.DEFAULT_SIZE, 316, Short.MAX_VALUE)
            .addComponent(progressLabel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
        .addComponent(cancelBtn)
        .addGap(18, 18, 18))
);
layout.setVerticalGroup(
    layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(cancelBtn))
            .addGroup(layout.createSequentialGroup()
                .addGap(12, 12, 12)
                .addComponent(progressLabel)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(progressBar, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
        .addContainerGap())
);

pack();

Answer 1

作为一个建议（这当然可能是你的答案）我会压缩进度对话框中显示的路径 window 到你所需的最大宽度的最大宽度（以字符为单位）进度条，例如：

C:\Users...\Documents\Helicoil Charts.docx

在大多数情况下，向用户显示完整路径并不是真正的要求，但是如果是这样，那么如果用户将鼠标移到 his/her 上，则可以将完整路径长度显示为工具提示JLabel，例如：

jLabel1.setToolTip(myFullPathVariable);

要压缩文件路径，您可以使用此方法：

/**
* Compact a file path into a given number of characters. <u>Similar</u> to the
* Windows Win32 API PathCompactPathExA API function.
* @param path (String) The Path to compact.
* @param charLimit (Integer) The maximum number of characters the path is allowed to be.
* @return (String) The compacted Path.
*/
public static String CompactPathBC(String path, int charLimit) {
    if (path.length() <= charLimit) { return path; }

    char shortPathArray[] = new char [charLimit];
    char pathArray [] = path.toCharArray();
    char ellipseArray [] = "...".toCharArray();

    int pathindex = pathArray.length - 1 ;
    int shortpathindex = charLimit - 1;

    // fill the array from the end
    int i = 0;
    for (; i < charLimit  ; i++) {
        if (pathArray[pathindex - i] != '/' && pathArray[pathindex - i] != '\') {
            shortPathArray[shortpathindex - i] = pathArray[pathindex - i] ;
        }
        else { break; }
    }
    // check how much space is left
    int free = charLimit - i;

    if (free < "...".length()) {
        // fill the beginning with ellipse
        System.arraycopy(ellipseArray, 0, shortPathArray, 0, ellipseArray.length);
    }
    else {
        // fill the beginning with path and leave room for the ellipse
        int j = 0;
        for(; j + ellipseArray.length < free; j++) { shortPathArray[j] = pathArray[j] ; }
        // ... add the ellipse
        for(int k = 0; j + k < free;k++) { shortPathArray[j + k] = ellipseArray[k] ; }
    }
    return new String(shortPathArray);
}

通过使用 Font Metrics，您还可以创建一种方法，使您的路径达到特定的最大宽度（以像素为单位）。

JLabel 将项目推出屏幕

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