如何获得最大化的框架尺寸？

Question

我设置最大化的框架：setExtendedState(getExtendedState() | JFrame.MAXIMIZED_BOTH);

现在我怎么能得到这个尺寸，因为当我打电话getSize()或getPreferredSize返回0 0？

Answer 1

在执行setVisible(true);后，您将获得正确尺寸的最大化。

public NewJFrame() {       // Constructor 
    initComponents(); 
    this.setExtendedState(getExtendedState() | JFrame.MAXIMIZED_VERT | Frame.MAXIMIZED_HORIZ); 
    // height and width still prints the original values 
    System.out.println(this.getSize().height + " " + this.getSize().width); 
} 

.... 

public static void main(String args[]) {  // main 
    java.awt.EventQueue.invokeLater(new Runnable() { 
     public void run() { 
      NewJFrame foo = new NewJFrame(); 
      foo.setVisible(true); 
      // after setVisible(true) actual maximized values 
      System.out.println(foo.getSize().height + " " + foo.getSize().width); 
     } 
    }); 
} 

Answer 2

欲面板，其是在框一样大（大）的尺寸是帧。

import java.awt.*; 
import javax.swing.*; 

class FullSizePanel { 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 
      public void run() { 
       // this is the panel we want to fill the entire content area 
       // of the parent frame. 
       JPanel redFullSizePanel = new JPanel(new BorderLayout()); 
       // make it true to the first part of the attribute name 
       redFullSizePanel.setBackground(Color.RED); 

       JFrame f = new JFrame("Full Size Panel"); 
       // 1) The default layout for a content pane is BorderLayout 
       // 2) A component added to a BL with no layout constraint ends 
       //  up in the CENTER 
       // 3) A component in the CENTER of a BL takes the full space 
       //  (that is not used up by components in the EAST, WEST, 
       //  NORTH & SOUTH). 
       f.add(redFullSizePanel); 

       f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); 
       f.pack(); 
       f.setSize(400,400); 
       f.setLocationByPlatform(true); 
       f.setVisible(true); 
      } 
     }); 
    } 
} 

---

什么布局有用吗？

网格或方块布局1个和x行

import java.awt.*; 
import javax.swing.*; 

class FullSizePanel { 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 
      public void run() { 
       // grid or box layout with 1 column and x rows 
       LayoutManager lm = new GridLayout(0,1,5,5); 
       // this is the panel we want to fill the entire content area 
       // of the parent frame. 
       JPanel redFullSizePanel = new JPanel(lm); 
       // make it true to the first part of the attribute name 
       redFullSizePanel.setBackground(Color.RED); 

       for (int ii=1; ii<6; ii++) { 
        redFullSizePanel.add(new JLabel("Label " + ii)); 
        redFullSizePanel.add(new JButton("Button " + ii)); 
       } 

       JFrame f = new JFrame("Full Size Panel"); 
       // 1) The default layout for a content pane is BorderLayout 
       // 2) A component added to a BL with no layout constraint ends 
       //  up in the CENTER 
       // 3) A component in the CENTER of a BL takes the full space 
       //  (that is not used up by components in the EAST, WEST, 
       //  NORTH & SOUTH. 
       f.add(redFullSizePanel); 

       f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); 
       f.pack(); 
       f.setSize(400,400); 
       f.setLocationByPlatform(true); 
       f.setVisible(true); 
      } 
     }); 
    } 
} 

Answer 3

您可以尝试获得最大的 “通用” 窗口大小。由于您的应用程序已最大化，它应该产生同样的结果：

GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment(); 
Dimension screenDimension = env.getMaximumWindowBounds().getSize(); 

不要忘记，你的窗口也有所谓的插图：

Insets insets = frame.getInsets(); 
final int left = insets.left; 
final int right = insets.right; 
final int top = insets.top; 
final int bottom = insets.bottom; 

final int width = screenDimension.width - left - right; 
final int height = screenDimension.height - top - bottom;