java 如何在 JFrame 中设置图像的位置
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How set location of an image in a JFrame
提问by java
I'm trying to set the the location of an image in a JFrame. I thought label.setLocation(100, 100);would set the location of the image to 100, 100 (top left corner), but it doesn't seem to do anything no matter were I put it. I even tried panal.setLocation(100, 100). Both do nothing, I get no errorsand the image does appearsbut at 0, 0. What am I doning wrong? Here's my code:
我正在尝试在 JFrame 中设置图像的位置。我以为label.setLocation(100, 100); 会将图像的位置设置为 100, 100（左上角），但无论我放置它似乎都没有任何作用。我什至试过 panal.setLocation(100, 100)。两者都什么都不做，我没有收到任何错误，图像确实出现但在 0, 0。我做错了什么？这是我的代码：
import javax.swing.*;
public class DisplayImage {
public DisplayImage() {
JFrame frame = new JFrame("Display Image");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = (JPanel)frame.getContentPane();
JLabel label = new JLabel();
label.setIcon(new ImageIcon("src/img/school.png"));
label.setLocation(100, 100);
panel.add(label);
frame.setLocationRelativeTo(null);
frame.pack();
frame.setVisible(true);
}
public static void main (String args[]) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new DisplayImage();
}
});
}
}
回答by camickr
By default a JFrame uses a BorderLayout. When you add your label to the frame the label is added to the CENTER of the BorderLayout. The layout manager will override the location.
默认情况下，JFrame 使用 BorderLayout。当您将标签添加到框架时，标签将添加到 BorderLayout 的 CENTER。布局管理器将覆盖该位置。
One simple solution is to add an EmptyBorder to the label with the top/left insets being 100. Then instead of add the label to the center you would add the label to the NORTH. The code would be something like:
一个简单的解决方案是向标签添加一个 EmptyBorder，顶部/左侧的插图为 100。然后将标签添加到 NORTH，而不是将标签添加到中心。代码类似于：
label.setBorder( new EmptyBorder(...) );
panel.add(label, BorderLayout.SOUTH);
As a general rule you should not be trying to specify exact location of a component. Let the layout managers to their jobs.
作为一般规则，您不应尝试指定组件的确切位置。让布局经理开始他们的工作。
回答by MadProgrammer
The JFrame, by default, uses a BorderLayoutas it's layout manager. This will override any settings you supply to the setLocationmethod.
在JFrame默认情况下，采用的是BorderLayout因为它的布局管理器。这将覆盖您提供给该setLocation方法的任何设置。
You have a number of options...
你有很多选择...
- Use something like
JLayeredPane, which does not, but default, have layout manager of it's own set by default. See How to use layered panesfor more details - Create a custom component capable of renderering the image where you want it. Check out Performing Custom Paintingfor more details
- Create your own layout manager that performs the operations you want...
回答by 7stud
This works for me:
这对我有用：
import java.awt.Dimension;
import javax.swing.*;
public class DisplayImage {
public DisplayImage() {
JFrame frame = new JFrame("Display Image");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = (JPanel)frame.getContentPane();
panel.setLayout(null);
JLabel label = new JLabel();
label.setIcon(new ImageIcon("rails.png"));
panel.add(label);
Dimension size = label.getPreferredSize();
label.setBounds(100, 100, size.width, size.height);
frame.setSize(300, 200);
frame.setVisible(true);
}
public static void main (String args[]) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new DisplayImage();
}
});
}
}
But you should read this:
但你应该阅读这个：
http://docs.oracle.com/javase/tutorial/uiswing/layout/none.html
http://docs.oracle.com/javase/tutorial/uiswing/layout/none.html
