在弹出窗口中使用 TextBubbleBorder

Question

首先非常感谢 Andrew Thompson 对圆角边框的解决方案。

现在我的问题。我尝试在我们的应用程序中添加“新功能”功能（指向新组件的小气泡）。除了边框的透明度功能外，一切正常。这是我的 MCVE（抱歉有点长，因为它包含 Andrew 编写的代码）。

import java.awt.BasicStroke;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Component;

import java.awt.Cursor;

import java.awt.Dimension;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Insets;

import java.awt.Point;

import java.awt.Polygon;

import java.awt.Rectangle;

import java.awt.RenderingHints;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.font.TextAttribute;

import java.awt.geom.Area;

import java.awt.geom.RoundRectangle2D;

import java.util.Collections;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JTextArea;

import javax.swing.Popup;

import javax.swing.PopupFactory;

import javax.swing.UIManager;

import javax.swing.WindowConstants;

import javax.swing.border.AbstractBorder;

这是我得到的结果 

如您所见，弹出窗口的底部不是透明的。我明白为什么会这样（最初的解决方案不适合这种情况），但找不到解决方案。有任何想法吗？

Answer 1

看看半透明和异形摆动窗| 爪哇网。可能会有所帮助。// Add Popup to a transparent JWindow to create and display.PopupFactory.setSharedInstance(new TranslucentPopupFactory());// popup should only be closed when user clicks the "Close" button.Popup popup = PopupFactory.getSharedInstance().getPopup(button, hintPanel, x, y);PopupTryout2.javaimport java.awt.*;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.font.TextAttribute;import java.awt.geom.Area;import java.awt.geom.RoundRectangle2D;import java.util.Collections;import javax.swing.*;import javax.swing.border.AbstractBorder;public class PopupTryout2 {  public static void main(String[] args) {    JFrame frm = new JFrame("Popup test");    JButton button = new JButton("Test");    JPanel p = new JPanel();    p.add(button);    frm.add(p, BorderLayout.SOUTH);    frm.add(new JScrollPane(new JTextArea()));    JPanel hintPanel = new JPanel();    hintPanel.add(new JLabel("This button has no function ;)"));    hintPanel.setOpaque(false);    JLabel closeBtn = new JLabel("Close");    closeBtn.setForeground(Color.BLUE);    closeBtn.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));    hintPanel.add(closeBtn);    hintPanel.setBorder(new TextBubbleBorder(Color.BLACK, 1, 6, 8, false));    hintPanel.setOpaque(false);    frm.setSize(600, 500);    frm.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);    frm.setLocationRelativeTo(null);    frm.setVisible(true);    Point pt = button.getLocationOnScreen();    Dimension panelSize = hintPanel.getPreferredSize();    Dimension buttonSize = button.getSize();    int x = pt.x + buttonSize.width - panelSize.width;    int y = pt.y - panelSize.height - 10;    PopupFactory.setSharedInstance(new TranslucentPopupFactory());    // popup should only be closed when user clicks the "Close" button.    Popup popup = PopupFactory.getSharedInstance().getPopup(button, hintPanel, x, y);    popup.show();    // "link style" button    closeBtn.addMouseListener(new MouseAdapter() {      @Override public void mouseEntered(MouseEvent e) {        Font f = e.getComponent().getFont();        e.getComponent().setFont(underlineOn(f));      }      @Override public void mouseExited(MouseEvent e) {        e.getComponent().setFont(UIManager.getFont("Label.font"));      }      @Override public void mousePressed(MouseEvent e) {        popup.hide();      }    });  }  public static Font underlineOn(Font aBaseFont) {    return aBaseFont.deriveFont(Collections.singletonMap(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON));  }  static class TextBubbleBorder extends AbstractBorder {    private Color color;    private int thickness = 4;    private int radii = 8;    private int pointerSize = 7;    private Insets insets = null;    private BasicStroke stroke = null;    private int strokePad;    private int pointerPad = 4;    private boolean left = true;    RenderingHints hints;    TextBubbleBorder(Color color) {      this(color, 4, 8, 7);    }    TextBubbleBorder(Color color, int thickness, int radii, int pointerSize) {      this.thickness = thickness;      this.radii = radii;      this.pointerSize = pointerSize;      this.color = color;      stroke = new BasicStroke(thickness);      strokePad = thickness / 2;      hints = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);      int pad = radii + strokePad;      int bottomPad = pad + pointerSize + strokePad;      insets = new Insets(pad, pad, bottomPad, pad);    }    TextBubbleBorder(Color color, int thickness, int radii, int pointerSize, boolean left) {      this(color, thickness, radii, pointerSize);      this.left = left;    }    @Override public Insets getBorderInsets(Component c) {      return insets;    }    @Override public Insets getBorderInsets(Component c, Insets insets) {      return getBorderInsets(c);    }    @Override public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {      Graphics2D g2 = (Graphics2D) g;      int bottomLineY = height - thickness - pointerSize;      RoundRectangle2D.Double bubble =        new RoundRectangle2D.Double(0 + strokePad, 0 + strokePad, width - thickness, bottomLineY, radii, radii);      Polygon pointer = new Polygon();      if (left) {        pointer.addPoint(strokePad + radii + pointerPad, bottomLineY);        pointer.addPoint(strokePad + radii + pointerPad + pointerSize, bottomLineY);        pointer.addPoint(strokePad + radii + pointerPad + (pointerSize / 2), height - strokePad);      } else {        pointer.addPoint(width - (strokePad + radii + pointerPad), bottomLineY);        pointer.addPoint(width - (strokePad + radii + pointerPad + pointerSize), bottomLineY);        pointer.addPoint(width - (strokePad + radii + pointerPad + (pointerSize / 2)), height - strokePad);      }      Area area = new Area(bubble);      area.add(new Area(pointer));      g2.setRenderingHints(hints);      // Paint the BG color of the parent, everywhere outside the clip      // of the text bubble.      Component parent = c.getParent();      if (parent != null) {        Color bg = parent.getBackground();        // Rectangle rect = new Rectangle(0, 0, width, height);        // Area borderRegion = new Area(rect);        // borderRegion.subtract(area);        // g2.setClip(borderRegion);        // g2.setColor(bg);        // g2.fillRect(0, 0, width, height);        // g2.setClip(null);        g2.setPaint(bg);        g2.fill(area);      }      g2.setColor(color);      g2.setStroke(stroke);      g2.draw(area);    }  }}/*@see http://today.java.net/pub/a/today/2008/03/18/translucent-and-shaped-swing-windows.htmlhttps://web.archive.org/web/20150515015137/http://today.java.net/pub/a/today/2008/03/18/translucent-and-shaped-swing-windows.htmlTranslucent and Shaped Swing Windows | Java.net*/class TranslucentPopupFactory extends PopupFactory {  @Override public Popup getPopup(Component owner, Component contents, int x, int y) {    return new TranslucentPopup(owner, contents, x, y);  }}class TranslucentPopup extends Popup {  private final JWindow popupWindow;  protected TranslucentPopup(Component owner, Component contents, int ownerX, int ownerY) {    super(owner, contents, ownerX, ownerY);    // create a new heavyweight window    this.popupWindow = new JWindow();    // mark the popup with partial opacity    // AWTUtilities.setWindowOpacity(popupWindow, (contents instanceof JToolTip) ? .8f : .95f);    // popupWindow.setOpacity(.5f);    // AWTUtilities.setWindowOpaque(popupWindow, false); // Java 1.6.0_10    popupWindow.setBackground(new Color(0x0, true)); // Java 1.7.0    // determine the popup location    popupWindow.setLocation(ownerX, ownerY);    // add the contents to the popup    popupWindow.getContentPane().add(contents);    contents.invalidate();    // JComponent parent = (JComponent) contents.getParent();    // set the shadow border    // parent.setBorder(new ShadowPopupBorder());  }  @Override public void show() {    System.out.println("Always Heavy weight!");    this.popupWindow.setVisible(true);    this.popupWindow.pack();    // mark the window as non-opaque, so that the    // shadow border pixels take on the per-pixel    // translucency    // AWTUtilities.setWindowOpaque(this.popupWindow, false);  }  @Override public void hide() {    this.popupWindow.setVisible(false);    this.popupWindow.removeAll();    this.popupWindow.dispose();  }}