访问并创建Swing GUI元素树 [英] Access and create a tree of Swing GUI elements
问题描述
我的问题是如何访问Swing GUI元素树(主窗口,JPanels,JFrames,JButtons,JTextFields等)并创建对该树的引用。我需要将它保存在数据结构(例如散列映射)中,而不是保存在内存文件中(例如,使用序列化)。稍后我需要使用它来将这些UI元素映射到代码中的相应对象。
My question is how to access the Swing GUI element tree (main window, JPanels, JFrames, JButtons, JTextFields ect) and create a reference to that tree. I need this to be kept in a data structure (ex. hash map) and NOT in a memory file (eg. using serialization). I need this for using it later to map these UI elements to the corresponding objects inside the code.
编辑:
JFrame f = new JFrame("Basic GUI");
JPanel pnl1 = new JPanel();
JPanel pnl2 = new JPanel();
JPanel pnl3 = new JPanel();
JLabel lblText = new JLabel("Test Label");
JButton btn1 = new JButton("Button");
JTextField txtField = new JTextField(20);
public GUISample(){
pnl1.add(lblText);
pnl2.add(btn1);
pnl3.add(txtField);
f.getContentPane().setLayout(new BorderLayout());
f.getContentPane().add(pnl2, BorderLayout.EAST);
f.getContentPane().add(pnl3, BorderLayout.WEST);
f.getContentPane().add(pnl1, BorderLayout.NORTH);
visitComponent(f);
}
private Map<String, Component> hashMap = new HashMap<String,Component>();
public Map<String, Component> getComponentsTree(){
return hashMap;
}
public void visitComponent(Component cmp){
// Add this component
if(cmp != null) hashMap.put(cmp.getName(), cmp);
Container container = (Container) cmp;
if(container == null ) {
// Not a container, return
return;
}
// Go visit and add all children
for(Component subComponent : container.getComponents()){
visitComponent(subComponent);
}
System.out.println(hashMap);
}
推荐答案
我有一直在想这个问题。以下是我的建议:
I have been thinking about this problem. Here is my suggestion:
public class ComponentTreeBuilder{
private Map<String, Component> hashMap = new HashMap<String,Component>();
public Map<String, Component> getComponentsTree(){
return hashMap;
}
public void visitComponent(Component cmp){
// Add this component
if(cmp != null) hashMap.put(cmp.getName(), cmp);
Container container = (Container) cmp;
if(container == null ) {
// Not a container, return
return;
}
// Go visit and add all children
for(Component subComponent : container.getComponents()){
visitComponent(subComponent);
}
}
}
并使用如下:
Frame myFrame = new JFrame();
// Make sure you add your elements into the frame's content pane by
myFrame.getContentPane(component);
ComponentTreeBuilder cmpBuilder = new ComponentTreeBuilder();
cmpBuilder.visitComponent(myFrame);
Map<String, Component> components = cmpBuilder.getComponentsTree();
// All components should now be in components hashmap
请注意 ComponentTreeBuilder
正在使用递归,如果GUI中有太多组件,这可能会引发堆栈溢出异常。
Please note that ComponentTreeBuilder
is using recursion, this might throw a stack overflow exception if you have too many components in your GUI.
编辑刚刚在真实示例中对此代码进行了测试......它的工作原理是:)
EDIT Just tested this code on real example and.... it works :)
以下是代码:
JFrame frame = new JFrame();
frame.getContentPane().add(new JButton());
frame.getContentPane().add(new JButton());
frame.getContentPane().add(new JButton());
frame.getContentPane().add(new JButton());
visitComponent(frame);
这是输出:
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