Статьи

Чат пузырь в Java Swing

Ноябрь 19, 2018
Эта статья объяснит вам, «как нарисовать пузырь чата в Java-приложении Swing?» Пузырь в чате — это то же самое, что и выноска или мысль. Сегодня большинство приложений чата показывает конверсию в этом формате, поэтому эта статья поможет вам сделать то же самое в настольном приложении, созданном в java swing.

chatbubble1

Следующий класс используется для рисования первого пузыря чата: (Стрелка на левой стороне пузыря)

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import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Polygon;
import java.awt.RenderingHints;
import java.awt.geom.Area;
import java.awt.geom.RoundRectangle2D;
import javax.swing.JPanel;
/**
 * @author harsh
 */
public class LeftArrowBubble extends JPanel {
   private static final long serialVersionUID = -5389178141802153305L;
   private int radius = 10;
   private int arrowSize = 12;
   private int strokeThickness = 3;
   private int padding = strokeThickness / 2;
   @Override
   protected void paintComponent(final Graphics g) {
      final Graphics2D g2d = (Graphics2D) g;
      g2d.setColor(new Color(0.5f, 0.8f, 1f));
      int x = padding + strokeThickness + arrowSize;
      int width = getWidth() - arrowSize - (strokeThickness * 2);
      int bottomLineY = getHeight() - strokeThickness;
      g2d.fillRect(x, padding, width, bottomLineY);
      g2d.setRenderingHints(new RenderingHints(RenderingHints.KEY_ANTIALIASING,   RenderingHints.VALUE_ANTIALIAS_ON));
      g2d.setStroke(new BasicStroke(strokeThickness));
      RoundRectangle2D.Double rect = new RoundRectangle2D.Double(x, padding, width, bottomLineY, radius, radius);
      Polygon arrow = new Polygon();
      arrow.addPoint(20, 8);
      arrow.addPoint(0, 10);
      arrow.addPoint(20, 12);
      Area area = new Area(rect);
      area.add(new Area(arrow));
      g2d.draw(area);
   }
}

Следующий код должен нарисовать второй пузырь чата. (Стрелка на правой стороне пузыря):

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import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Polygon;
import java.awt.RenderingHints;
import java.awt.geom.Area;
import java.awt.geom.RoundRectangle2D;
import javax.swing.JPanel;
/**
 * @author harsh
 */
public class RightArrowBubble extends JPanel {
   private static final long serialVersionUID = -5389178141802153305L;
   private int strokeThickness = 3;
   private int radius = 10;
   private int arrowSize = 12;
   private int padding = strokeThickness / 2;
   @Override
   protected void paintComponent(final Graphics g) {
      final Graphics2D g2d = (Graphics2D) g;
      g2d.setColor(new Color(0.5f, 0.5f, 1f));
      int bottomLineY = getHeight() - strokeThickness;
      int width = getWidth() - arrowSize - (strokeThickness * 2);
      g2d.fillRect(padding, padding, width, bottomLineY);
      RoundRectangle2D.Double rect = new RoundRectangle2D.Double(padding, padding, width, bottomLineY,  radius, radius);
      Polygon arrow = new Polygon();
      arrow.addPoint(width, 8);
      arrow.addPoint(width + arrowSize, 10);
      arrow.addPoint(width, 12);
      Area area = new Area(rect);
      area.add(new Area(arrow));
      g2d.setRenderingHints(new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON));
      g2d.setStroke(new BasicStroke(strokeThickness));
      g2d.draw(area);
   }
}

А вот код для использования выше 2 классов:

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import java.awt.HeadlessException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.GroupLayout;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
/**
 * @author harsh
 */
public class TestPanel extends JPanel {
 private static final long serialVersionUID = 9029457020704524363L;
 private JLabel messageLbl1, userImageLbl1, messageLbl, userImageLbl;
    private JPanel msgPanel1, msgPanel;
    String userImageUrl = "http://cdn1.iconfinder.com/data/icons/nuvola2/22x22/apps/personal.png";
    public TestPanel() throws MalformedURLException {
        userImageLbl = new JLabel();
        msgPanel = new LeftArrowBubble();
        messageLbl = new JLabel();
        messageLbl1 = new JLabel();
        msgPanel1 = new RightArrowBubble();
        userImageLbl1 = new JLabel();
 
        userImageLbl.setIcon(new ImageIcon(new URL(userImageUrl)));
        messageLbl.setText("Hi, How are you?");
 
        GroupLayout msgPanelLayout = new GroupLayout(msgPanel);
        msgPanel.setLayout(msgPanelLayout);
        msgPanelLayout.setHorizontalGroup(
            msgPanelLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
            .addGroup(msgPanelLayout.createSequentialGroup()
                .addGap(21, 21, 21)
                .addComponent(messageLbl)
                .addContainerGap(162, Short.MAX_VALUE))
        );
        msgPanelLayout.setVerticalGroup(
            msgPanelLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
            .addGroup(msgPanelLayout.createSequentialGroup()
                .addComponent(messageLbl)
                .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
 
        messageLbl1.setIcon(new ImageIcon(new URL(userImageUrl)));
        userImageLbl1.setText("I'm Good.");
 
        GroupLayout jPanel1Layout = new GroupLayout(msgPanel1);
        msgPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(GroupLayout.Alignment.LEADING)
            .addGroup(GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                .addContainerGap(171, Short.MAX_VALUE)
                .addComponent(userImageLbl1)
                .addGap(22, 22, 22))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addComponent(userImageLbl1)
                .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
 
        GroupLayout layout = new GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(userImageLbl)
                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.TRAILING)
                    .addComponent(msgPanel1, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(msgPanel, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addComponent(messageLbl1)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                    .addComponent(userImageLbl)
                    .addComponent(msgPanel, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                    .addComponent(messageLbl1)
                    .addComponent(msgPanel1, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
                .addContainerGap(22, Short.MAX_VALUE))
        );
    }
    public static void main(String[] args) {
  SwingUtilities.invokeLater(new Runnable() {
   public void run() {
    try {
     JOptionPane.showMessageDialog(null, new TestPanel());
    } catch (HeadlessException e) {
     e.printStackTrace();
    } catch (MalformedURLException e) {
     e.printStackTrace();
    }
   }
  });
 }
}

Ссылка: Чат пузырь в java swing от нашего партнера JCG Харш Равал в блоге harryjoy .

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