Java Swing JToolBar [英] Java Swing JToolBar

问题描述

我已经创建了 JToolBar (Java Swing).我在包含 JToolBar 的框架上设置了一个背景图像.我希望我的 JToolBar 是透明的，以便保持在框架上的图像应该是可见的.我正在使用 setOpaque(false) 但它对我的工具栏没有任何影响.. 以前有没有人喜欢这个?我的代码如下

I have created JToolBar (Java Swing). I have set a Background image on frame which contains JToolBar. I want my JToolBar to be transparent so that the image kept on frame should be visible. I am using setOpaque(false) but it is not having any effect on my toolbar.. Has anyone delt with this before? My Code is as follows

import javax.swing.ImageIcon;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class NewJFrame extends javax.swing.JFrame {
    static NewJFrame dialog = null;

    /** Creates new form NewJFrame */
    public NewJFrame() {
        initComponents();
        jToolBar1.setOpaque(false);
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jToolBar1 = new javax.swing.JToolBar();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jToolBar1.setRollover(true);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jToolBar1, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(jToolBar1, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(275, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {



            public void run() {

                try {
                    try {
                        // Set cross-platform Java L&F (also called "Metal")
                        UIManager.setLookAndFeel(UIManager.
                                getSystemLookAndFeelClassName());

                    } catch (UnsupportedLookAndFeelException ex) {
                        ex.printStackTrace();
                    }
                } catch (ClassNotFoundException e) {
                    e.printStackTrace();
                } catch (InstantiationException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
                ImagePanel panel = new ImagePanel(new ImageIcon("image").getImage());
                dialog = new NewJFrame();
                dialog.getContentPane().add(panel);
                dialog.setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JToolBar jToolBar1;
    // End of variables declaration

}

推荐答案

JToolBar 创建 JButton 以包含您在其上设置的操作.默认情况下，JButton 是不透明的.要获得您所描述的效果，您需要覆盖 JToolBar.createActionComponent.

JToolBar creates JButtons to contain the actions you set on it. By default, JButtons are opaque. To get the effect you're describing, you need to override JToolBar.createActionComponent.

例如:

    jToolBar1 = new javax.swing.JToolBar() {
        @Override
        protected JButton createActionComponent(Action a) {
            JButton jb = super.createActionComponent(a);
            jb.setOpaque(false);
            return jb;
        }
    };

注意: YMMV 取决于使用的 LAF.

Note: YMMV depending on the LAF in use.

这篇关于Java Swing JToolBar的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！