Question

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

现在我如何才能获得此尺寸，因为当我致电getSize()或getPreferredSize时，它会返回0 0？

Answer 1

执行setVisible(true);后，您将获得最大化尺寸。

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

我希望框架的大小与框架一样大（大）。

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);
            }
        });
    }
}

哪种布局有用？

包含1列和x行的网格或框布局

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

您可以尝试获取最大“通用”窗口大小。由于您的应用程序已最大化，因此应该产生相同的结果：

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;

如何获得最大化的框架尺寸？

3 个答案: