我有一個JPanel,它帶有一個頻繁加載新圖片的JLabel。我編程調整大小以適應每次加載後的圖片。但是,我希望用戶能夠將面板調整到一定的大小,並保持這種狀態(當前的重新加載無法永久調整大小會加劇)。我的代碼不工作,雖然:在用戶調整大小後停止調整jpanel的大小
public class Grapher extends JFrame{
private JScrollPane scrollPane;
private static JPanel topPanel;
private static JLabel label;
private static ImageIcon image;
private static boolean dontResize = false;
private static boolean firstTime = true;
public Grapher(){
setTitle("some graph");
setBackground(Color.gray);
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
topPanel = new JPanel();
topPanel.setLayout(new BorderLayout());
getContentPane().add(topPanel);
label = new JLabel();
scrollPane = new JScrollPane();
scrollPane.getViewport().add(label);
topPanel.add(scrollPane, BorderLayout.CENTER);
topPanel.addComponentListener(new Listeners());
topPanel.setName("Soar Grapher Panel");
}
public void display(String fileName){
//steal focus the first time an image is displayed
if(image == null)
setVisible(true);
image = new ImageIcon(fileName);
image.getImage().flush();
boolean temp = dontResize;
setSize(getPreferredSize());
dontResize = temp;
System.out.println("afterWards: " + dontResize);
label.setIcon(image);
label.repaint();
}
@Override
public Dimension getPreferredSize(){
if(dontResize){
System.err.println("not resizing!");
return getSize();
}
if (image == null)
return new Dimension(100,100);
else
return new Dimension(image.getIconWidth() > getWidth() + 40 ? image.getIconWidth() + 40 : getWidth(),
image.getIconHeight() > getHeight() + 60 ? image.getIconHeight() + 60 : getHeight());
}
private class Listeners implements ComponentListener{
@Override
public void componentHidden(ComponentEvent arg0) {}
@Override
public void componentMoved(ComponentEvent arg0) {}
@Override
public void componentResized(ComponentEvent arg0) {
System.out.println("componentResized: " + dontResize);
//TODO make it not resize after the user resizes it themselves.
System.err.println(arg0.getComponent().getName());
System.err.println("resized!");
if(!firstTime)
dontResize = true;
firstTime = false;
}
@Override
public void componentShown(ComponentEvent arg0) {}
}
}
我試圖挽救dontResize布爾當程序調整大小,但不幸的是聽者似乎激活resize()
功能不前。如何區分用戶調整大小和編程大小?
EDIT_ _ __ _ __ 綱領性調整大小的持續時間內刪除聽衆似乎是要走的路;然而,除了用戶調整大小之外,聽衆似乎隨機地被調用,將所有東西搞亂。這是我有:
private static ComponentListener listeners = new Listeners();
private static boolean resizeOkay = true;
...
[inside the display() function]
if(resizeOkay){
removeComponentListener(listeners);
System.err.println("No handler should be called between here");
setSize(getPreferredSize());
System.err.println("and here.");
addComponentListener(listeners);
}
label.setIcon(image);
label.repaint();
[inside the listener]
@Override
public void componentResized(ComponentEvent arg0) {
System.err.println("resize handler");
resizeOkay = false;
}
,無需任何用戶調整大小,上面的代碼打印:
No handler should be called between here
and here.
resize handler
resize handler
要不然怎麼是它被稱爲?這可以防止窗口被調整大小。
我看不出如何工作。我會在哪裏放?我的第一件事情根本不起作用,因爲我自己的程序多次調整面板大小。我需要允許我的程序調整大小,並在用戶調整大小後禁止它。 – 2011-05-13 06:31:45