在Java Swing的JPanel頂部設置GridBagLayout的位置

Question

我編寫了以下代碼，將JLabel添加到JPanel但它顯示在中央，而我希望將其放置在JPanel的頂部。

這是我要引用的代碼：

JPanel pnlProjects = new JPanel();
pnlProjects.setMinimumSize(new Dimension(10, 300));
GridBagLayout gridBagLayout = new GridBagLayout();
pnlProjects.setLayout(gridBagLayout);
GridBagConstraints gridBagConstraints = new GridBagConstraints();

// add multiple label dynamically;
for (int count = 0; count < project.length; count++) {
    lblProjects[count] = new JLabel("Project"+count );
    lblProjects[count].setHorizontalAlignment(SwingConstants.LEFT);
    lblProjects[count].setHorizontalTextPosition(SwingConstants.LEFT);
    lblProjects[count].setBorder(BorderFactory.createBevelBorder(0));
    lblProjects[count].setPreferredSize(new Dimension(100, 20));
    gridBagConstraints.fill = GridBagConstraints.VERTICAL;
    gridBagConstraints.gridx = 0;
    gridBagConstraints.gridy = count;
    pnlProjects.add(lblProjects[count], gridBagConstraints);
}

// Add project panel in to the scorllPan
JScrollPane jspProjectlist = new JScrollPane(pnlProjects);

有人願意向我解釋如何根據我的要求進行更改嗎？

Answer 1

您可以使用下一個技巧：在循環之后添加下一個代碼：

gridBagConstraints.weighty=1;
gridBagConstraints.gridy++;
pnlProjects.add(new JLabel(" "), gridBagConstraints);

那個虛假的JLabel將搶占項目JLabel的所有空間。