Floating menu and tree issues

shuiren1985

The problem requirements are as follows: Click the floating menu on the tree and select "Add Child Node" to generate 100 nodes. The 100 nodes are required to be dynamically displayed in the tree during the generation process, but now the situation is: 1, only all nodes are generated After that, they are displayed together. 2.When all nodes are not generated, the floating menu is maintained. Only when all nodes are generated, the floating menu disappears.

atepie0011

Typical Swing/AWT Event Dispatch Thread long-term occupation problem.
The method of handling events Before returning, all subsequent events of AWT's EventQueue, including the PAINT event, are blocked, so your interface cannot be refreshed, although you have updated the tree model.
Pay attention to Swing/AWT including SWT programming, and pay attention to two issues when dealing with long-term and heavy workload tasks:
* Time-consuming tasks should not be run on the Event Dispatch Thread. Otherwise the application becomes unresponsive.
Don't run tasks that consume events on the Event Dispatch Thread. Otherwise, the interface will be dead.
* Swing components should be accessed on the Event Dispatch Thread only.
Swing components can only be accessed in the Event Dispatch Thread.
A new class called SwingWorker was introduced in JDK 5 and JDK 6 to specifically solve this problem. For details, please refer to java API help:
http://download.java.net/jdk/jdk-api-localizations/jdk-api-zh-cn/builds/latest/html/zh_CN/api/javax/swing/SwingWorker.html

atepie0011

Give you a sample code:
//This method is the event processing method of the floating menu
private void actionPerform(ActionEvent e){
MySwingWorker msw=new MySwingWorker(yourTree);
   msw.execute();
}
//The following is the implementation of MySwingWorker:
public class MySwingWorker extends SwingWorker{
    private JTree tree;
    public MySwingWorker(JTree tree) {
        this.tree=tree;
    }
    protected Object doInBackground() throws Exception {
        for(int i=0;i<100;i++){
            //Generate a node and add it to the tree...
            //...;
            //Notify the EDT thread to refresh the tree
            publish();
        }
        return null;
    }
    protected void process(List<Object> chunks) {
        tree.repaint();
    }
}

shuiren1985

I used another thread to handle it.