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JPanel に背景画像を設定しましたが、ボタンを追加してカスタム背景パネルを選択しようとすると、ボタンの上にマウスを移動するまでボタンが非表示になります。以下のコードスニペットを含めました。

以下は私のカスタマイズされたJPanelです

package au.com.tankwarz.view.custompanels;

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;

import javax.swing.JPanel;

public class BackgroundPanel extends JPanel
{

    /**
     * 
     */
    private static final long serialVersionUID = 1659728640545162103L;

    public BackgroundPanel()
    {
    }

    @Override
    public void paintComponent(final Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D)g;
        g2d.drawImage(loadBackgroundImage(), 0, 0, this);    

        g2d.dispose();  
    }   

    private static BufferedImage loadBackgroundImage()
    {
         BufferedImage bi = new BufferedImage(800, 600, BufferedImage.TYPE_INT_ARGB);
         Graphics2D g2d = bi.createGraphics();
         g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

         // Paint a gradient from top to bottom
        GradientPaint gp = new GradientPaint( 0, 0, Color.BLACK, 0, 600, new Color(0, 0, 255).darker( ).darker() );

        g2d.setPaint( gp );
        g2d.fillRect( 0, 0, 800, 600 );

        g2d.dispose();

        return bi;
    }
}

そして、ここでボタン付きのパネルを表示するためにそれを使用しようとしています。

package au.com.tankwarz.view;
import java.awt.event.ActionListener;

import javax.swing.ComboBoxModel;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;

import org.jdesktop.application.Application;

import au.com.tankwarz.view.custompanels.BackgroundPanel;

import com.cloudgarden.layout.AnchorConstraint;
import com.cloudgarden.layout.AnchorLayout;

public class NewGamePanel extends BackgroundPanel {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private JLabel numberOfPlayersLable;
    private JComboBox numberOfPlayersCB;
    private JButton cancelButton;
    private JButton createPlayersButton;
    private JComboBox numberOfTanksCB;
    private JLabel numberOfTanksLable;
    private JComboBox numberOfRoundsCB;
    private JLabel numberOfRounds;

    public static final String[] numberOfPlayersCBValues = new String[] { "Two", "Three", "Four" };

    public static final String[] numberOfRoundsCBValues = new String[] { "One", "Two", "Three", "Four" };

    public static final String[] numberOfTanksCBValues = new String[] { "One", "Two", "Three", "Four" };

    public static void main(String[] args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                //new NewGamePanel();


                JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new NewGamePanel());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });


    }

    public NewGamePanel() {
        super();
        initGUI();
    }

    private void initGUI() {
        try {
            AnchorLayout thisLayout = new AnchorLayout();
            this.setLayout(thisLayout);
            this.setPreferredSize(new java.awt.Dimension(800, 600));
            this.setSize(800, 600);
            this.setOpaque(true);
            this.setName("this");
            {
                numberOfPlayersLable = new JLabel();
                this.add(numberOfPlayersLable, new AnchorConstraint(144, 320, 201, 77, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL));
                numberOfPlayersLable.setName("numberOfPlayersLable");
                numberOfPlayersLable.setPreferredSize(new java.awt.Dimension(60, 40));
            }
            {
                ComboBoxModel numberOfPlayersCBModel = 
                    new DefaultComboBoxModel(numberOfPlayersCBValues);
                numberOfPlayersCB = new JComboBox();
                this.add(numberOfPlayersCB, new AnchorConstraint(125, 697, 219, 386, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL));
                numberOfPlayersCB.setModel(numberOfPlayersCBModel);
                numberOfPlayersCB.setPreferredSize(new java.awt.Dimension(60, 40));
            }
            {
                numberOfRounds = new JLabel();
                this.add(numberOfRounds, new AnchorConstraint(298, 371, 355, 77, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL));
                numberOfRounds.setName("numberOfRounds");
                numberOfRounds.setPreferredSize(new java.awt.Dimension(60, 40));
            }
            {
                ComboBoxModel numberOfRoundsCBModel = 
                    new DefaultComboBoxModel(numberOfRoundsCBValues);
                numberOfRoundsCB = new JComboBox();
                this.add(numberOfRoundsCB, new AnchorConstraint(283, 697, 366, 386, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL));
                numberOfRoundsCB.setModel(numberOfRoundsCBModel);
                numberOfRoundsCB.setName("numberOfRoundsCB");
                numberOfRoundsCB.setPreferredSize(new java.awt.Dimension(60, 40));
            }
            {
                numberOfTanksLable = new JLabel();
                this.add(numberOfTanksLable, new AnchorConstraint(453, 320, 509, 77, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL));
                numberOfTanksLable.setName("numberOfTanksLable");
                numberOfTanksLable.setPreferredSize(new java.awt.Dimension(60, 40));
            }
            {
                ComboBoxModel numberOfTanksCBModel = 
                    new DefaultComboBoxModel(numberOfTanksCBValues);
                numberOfTanksCB = new JComboBox();
                this.add(numberOfTanksCB, new AnchorConstraint(437, 697, 520, 386, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL));
                numberOfTanksCB.setModel(numberOfTanksCBModel);
                numberOfTanksCB.setPreferredSize(new java.awt.Dimension(60, 40));
            }
            {
                createPlayersButton = new JButton();
                this.add(createPlayersButton, new AnchorConstraint(795, 758, 878, 511, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL));
                createPlayersButton.setName("createPlayersButton");
                createPlayersButton.setPreferredSize(new java.awt.Dimension(99, 25));
            }
            {
                cancelButton = new JButton();
                this.add(cancelButton, new AnchorConstraint(795, 248, 878, 128, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL, AnchorConstraint.ANCHOR_REL));
                cancelButton.setName("cancelButton");
                cancelButton.setPreferredSize(new java.awt.Dimension(48, 25));
            }
            Application.getInstance().getContext().getResourceMap(getClass()).injectComponents(this);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void setCreatePlayersButtonActionListener(ActionListener actionListener)
    {
        createPlayersButton.addActionListener(actionListener);
    }

    public void setCancelButtonActionListener(ActionListener actionListener)
    {
        cancelButton.addActionListener(actionListener);
    }

    public JComboBox getNumberOfPlayersCB()
    {
        return numberOfPlayersCB;
    }

    public void setNumberOfPlayersCB(JComboBox numberOfPlayersCB)
    {
        this.numberOfPlayersCB = numberOfPlayersCB;
    }

    public JComboBox getNumberOfTanksCB()
    {
        return numberOfTanksCB;
    }

    public void setNumberOfTanksCB(JComboBox numberOfTanksCB)
    {
        this.numberOfTanksCB = numberOfTanksCB;
    }

    public JComboBox getNumberOfRoundsCB()
    {
        return numberOfRoundsCB;
    }

    public void setNumberOfRoundsCB(JComboBox numberOfRoundsCB)
    {
        this.numberOfRoundsCB = numberOfRoundsCB;
    }

}

私はしばらくこれに苦労していたので、助けていただければ幸いです。

4

1 に答える 1

2
  1. どのメソッド内からでもコンポーネントの状態を変更しないでくださいpaintXxx。再描画イベントがトリガーされ、CPU が過熱するまでプロセスが繰り返される可能性があります。
  2. コンポーネントの不透明度の状態を 内から決して変更しないpaintXxxでください。これにより、Swing が現在のコンポーネントの背後に現在表示されているコンポーネントを見つけようと突然開始するため、一連のカスケード再描画が発生します...
  3. 作成していないコンテキストを破棄しないでください。破棄すると、Graphics後でペイントしたものが一部のシステムでレンダリングされなくなる可能性があります。
  4. ペイント サイクルごとに背景イメージを作成しないようにしてください。これは、メモリの観点からだけでなく、時間の観点からも費用がかかります。

不透明状態を反転する理由がわかりません。実際には透明にしたくありません。呼び出しsuper.paintComponentてグラフィックス状態を準備し、その上に画像を描画するだけです。

の使用も避ける必要があります。「 Java Swing で set(Preferred|Maximum|Minimum)Size メソッドを使用しないようにする必要がありますか?」をsetPreferredSize参照してください。詳細については...

ポイントを説明するだけです。これはコードが生成するものです（ペイントの問題を修正した後）

ここに画像の説明を入力

これは私のテストコードが生成するものです

ここに画像の説明を入力

テストコードで更新

import com.apple.eawt.Application;
import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.RenderingHints;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import javax.swing.ComboBoxModel;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class BackgroundPanel extends JPanel {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                //new NewGamePanel();

                JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new NewGamePanel());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }

        });

    }

    public BackgroundPanel() {
    }

    private static BufferedImage bi;

    @Override
    public void paintComponent(final Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g.create();
        g2d.drawImage(loadBackgroundImage(), 0, 0, this);
        g2d.dispose();
    }

    private static BufferedImage loadBackgroundImage() {
        if (bi == null) {
            bi = new BufferedImage(800, 600, BufferedImage.TYPE_INT_ARGB);
            Graphics2D g2d = bi.createGraphics();
            g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

            // Paint a gradient from top to bottom
            GradientPaint gp = new GradientPaint(0, 0, Color.BLACK, 0, 600, new Color(0, 0, 255).darker().darker());

            g2d.setPaint(gp);
            g2d.fillRect(0, 0, 800, 600);

            g2d.dispose();
        }

        return bi;
    }

    public static class NewGamePanel extends BackgroundPanel {

        /**
         *
         */
        private static final long serialVersionUID = 1L;
        private JLabel numberOfPlayersLable;
        private JComboBox numberOfPlayersCB;
        private JButton cancelButton;
        private JButton createPlayersButton;
        private JComboBox numberOfTanksCB;
        private JLabel numberOfTanksLable;
        private JComboBox numberOfRoundsCB;
        private JLabel numberOfRounds;

        public static final String[] numberOfPlayersCBValues = new String[]{"Two", "Three", "Four"};

        public static final String[] numberOfRoundsCBValues = new String[]{"One", "Two", "Three", "Four"};

        public static final String[] numberOfTanksCBValues = new String[]{"One", "Two", "Three", "Four"};

        public NewGamePanel() {
            super();
            initGUI();
        }

        private void initGUI() {
            try {
                GridBagLayout thisLayout = new GridBagLayout();
                this.setLayout(thisLayout);
                this.setPreferredSize(new java.awt.Dimension(800, 600));
                this.setSize(800, 600);
                this.setOpaque(true);
                this.setName("this");

                GridBagConstraints gbc = new GridBagConstraints();
                gbc.gridwidth = gbc.REMAINDER;
                {
                    numberOfPlayersLable = new JLabel();
                    this.add(numberOfPlayersLable, gbc);
                    numberOfPlayersLable.setName("numberOfPlayersLable");
                }
                {
                    ComboBoxModel numberOfPlayersCBModel
                                    = new DefaultComboBoxModel(numberOfPlayersCBValues);
                    numberOfPlayersCB = new JComboBox();
                    this.add(numberOfPlayersCB, gbc);
                    numberOfPlayersCB.setModel(numberOfPlayersCBModel);
                }
                {
                    numberOfRounds = new JLabel();
                    this.add(numberOfRounds, gbc);
                    numberOfRounds.setName("numberOfRounds");
                }
                {
                    ComboBoxModel numberOfRoundsCBModel
                                    = new DefaultComboBoxModel(numberOfRoundsCBValues);
                    numberOfRoundsCB = new JComboBox();
                    this.add(numberOfRoundsCB, gbc);
                    numberOfRoundsCB.setModel(numberOfRoundsCBModel);
                    numberOfRoundsCB.setName("numberOfRoundsCB");
                }
                {
                    numberOfTanksLable = new JLabel();
                    this.add(numberOfTanksLable, gbc);
                    numberOfTanksLable.setName("numberOfTanksLable");
                }
                {
                    ComboBoxModel numberOfTanksCBModel
                                    = new DefaultComboBoxModel(numberOfTanksCBValues);
                    numberOfTanksCB = new JComboBox();
                    this.add(numberOfTanksCB, gbc);
                    numberOfTanksCB.setModel(numberOfTanksCBModel);
                }
                {
                    createPlayersButton = new JButton();
                    this.add(createPlayersButton, gbc);
                    createPlayersButton.setName("createPlayersButton");
                }
                {
                    cancelButton = new JButton();
                    this.add(cancelButton, gbc);
                    cancelButton.setName("cancelButton");
                }
//                Application.getInstance().getContext().getResourceMap(getClass()).injectComponents(this);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        public void setCreatePlayersButtonActionListener(ActionListener actionListener) {
            createPlayersButton.addActionListener(actionListener);
        }

        public void setCancelButtonActionListener(ActionListener actionListener) {
            cancelButton.addActionListener(actionListener);
        }

        public JComboBox getNumberOfPlayersCB() {
            return numberOfPlayersCB;
        }

        public void setNumberOfPlayersCB(JComboBox numberOfPlayersCB) {
            this.numberOfPlayersCB = numberOfPlayersCB;
        }

        public JComboBox getNumberOfTanksCB() {
            return numberOfTanksCB;
        }

        public void setNumberOfTanksCB(JComboBox numberOfTanksCB) {
            this.numberOfTanksCB = numberOfTanksCB;
        }

        public JComboBox getNumberOfRoundsCB() {
            return numberOfRoundsCB;
        }

        public void setNumberOfRoundsCB(JComboBox numberOfRoundsCB) {
            this.numberOfRoundsCB = numberOfRoundsCB;
        }

    }

}
于 2013-10-28T10:13:27.603 に答える