📄 jximagepanel.java
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/* * $Id: JXImagePanel.java,v 1.8 2005/10/10 18:01:45 rbair Exp $ * * Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle, * Santa Clara, California 95054, U.S.A. All rights reserved. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */package org.jdesktop.swingx;import java.awt.Cursor;import java.awt.Dimension;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.Rectangle;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.image.BufferedImage;import java.io.File;import java.net.URL;import javax.swing.ImageIcon;import javax.swing.JFileChooser;import javax.swing.JLabel;import javax.swing.SwingUtilities;import static org.jdesktop.swingx.JXImagePanel.Style.CENTERED;import static org.jdesktop.swingx.JXImagePanel.Style.SCALED;import static org.jdesktop.swingx.JXImagePanel.Style.TILED;/** * <p>A panel that draws an image. The standard (and currently only supported) * mode is to draw the specified image starting at position 0,0 in the * panel. The component&s preferred size is based on the image, unless * explicitly set by the user.</p> * * <p>In the future, the JXImagePanel will also support tiling of images, * scaling, resizing, cropping, segways etc.</p> * * <p>This component also supports allowing the user to set the image. If the * <code>JXImagePanel</code> is editable, then when the user clicks on the * <code>JXImagePanel</code> a FileChooser is shown allowing the user to pick * some other image to use within the <code>JXImagePanel</code>.</p> * * <p>Images to be displayed can be set based on URL, Image, etc. * * @author unattributed, rbair */public class JXImagePanel extends JXPanel { public static enum Style {CENTERED, TILED, SCALED}; /** * Text informing the user that clicking on this component will allow them to set the image */ private static final String TEXT = "<html><i><b>Click here<br>to set the image</b></i></html>"; /** * The image to draw */ private BufferedImage img; /** * If true, then the image can be changed. Perhaps a better name is * "readOnly", but editable was chosen to be more consistent * with other Swing components. */ private boolean editable = false; /** * The mouse handler that is used if the component is editable */ private MouseHandler mhandler = new MouseHandler(); /** * If not null, then the user has explicitly set the preferred size of * this component, and this should be honored */ private Dimension preferredSize; /** * Specifies how to draw the image, i.e. what kind of Style to use * when drawing */ private Style style = Style.CENTERED; public JXImagePanel() { } public JXImagePanel(URL imageUrl) { try { setImage((BufferedImage)new ImageIcon(imageUrl).getImage()); } catch (Exception e) { //TODO need to log e.printStackTrace(); } } /** * Sets the image to use for the background of this panel. This image is * painted whether the panel is opaque or translucent. * @param image if null, clears the image. Otherwise, this will set the * image to be painted. If the preferred size has not been explicitly set, * then the image dimensions will alter the preferred size of the panel. */ public void setImage(BufferedImage image) { if (image != img) { BufferedImage oldImage = img; img = image; firePropertyChange("icon", oldImage, img); invalidate(); repaint(); } } /** * @return the image used for painting the background of this panel */ public BufferedImage getImage() { return img; } /** * @param editable */ public void setEditable(boolean editable) { if (editable != this.editable) { //if it was editable, remove the mouse handler if (this.editable) { removeMouseListener(mhandler); } this.editable = editable; //if it is now editable, add the mouse handler if (this.editable) { addMouseListener(new MouseHandler()); } setToolTipText(editable ? TEXT : ""); firePropertyChange("editable", !editable, editable); repaint(); } } /** * @return whether the image for this panel can be changed or not via * the UI. setImage may still be called, even if <code>isEditable</code> * returns false. */ public boolean isEditable() { return editable; } /** * Sets what style to use when painting the image * * @param s */ public void setStyle(Style s) { if (style != s) { Style oldStyle = style; style = s; firePropertyChange("style", oldStyle, s); repaint(); } } /** * @return the Style used for drawing the image (CENTERED, TILED, etc). */ public Style getStyle() { return style; } public void setPreferredSize(Dimension pref) { preferredSize = pref; super.setPreferredSize(pref); } public Dimension getPreferredSize() { if (preferredSize == null && img != null) { //it has not been explicitly set, so return the width/height of the image return new Dimension(img.getWidth(), img.getHeight()); } else { return super.getPreferredSize(); } } /** * Overriden to paint the image on the panel */ protected void paintComponent(Graphics g) { super.paintComponent(g);// Insets insets = getInsets();// g.fillRect(insets.left, insets.top, getWidth() - insets.right - insets.left, getHeight() - insets.bottom - insets.top); Graphics2D g2 = (Graphics2D)g; if (img != null) { switch (style) { case CENTERED: Rectangle clipRect = g2.getClipBounds(); int imageX = (getWidth() - img.getWidth()) / 2; int imageY = (getHeight() - img.getHeight()) / 2; Rectangle r = SwingUtilities.computeIntersection(imageX, imageY, img.getWidth(), img.getHeight(), clipRect); if (r.x == 0 && r.y == 0 && (r.width == 0 || r.height == 0)) { return; } //I have my new clipping rectangle "r" in clipRect space. //It is therefore the new clipRect. clipRect = r; //since I have the intersection, all I need to do is adjust the //x & y values for the image int txClipX = clipRect.x - imageX; int txClipY = clipRect.y - imageY; int txClipW = clipRect.width; int txClipH = clipRect.height; g2.drawImage(img, clipRect.x, clipRect.y, clipRect.x + clipRect.width, clipRect.y + clipRect.height, txClipX, txClipY, txClipX + txClipW, txClipY + txClipH, null); break; case TILED: case SCALED: Image temp = img.getScaledInstance(getWidth(), getHeight(), BufferedImage.SCALE_SMOOTH); g2.drawImage(temp, (getWidth() - temp.getWidth(null)) / 2, (getHeight() - temp.getHeight(null)) / 2, null); break; default: System.err.println("unimplemented"); g2.drawImage(img, null, 0, 0); break; } } } /** * Handles click events on the component */ private class MouseHandler extends MouseAdapter { private Cursor oldCursor; private JFileChooser chooser; public void mouseClicked(MouseEvent evt) { if (chooser == null) { chooser = new JFileChooser(); } int retVal = chooser.showOpenDialog(JXImagePanel.this); if (retVal == JFileChooser.APPROVE_OPTION) { File file = chooser.getSelectedFile(); try { setImage((BufferedImage)new ImageIcon(file.toURL()).getImage()); } catch (Exception ex) { } } } public void mouseEntered(MouseEvent evt) { JLabel label = (JLabel)evt.getSource(); if (oldCursor == null) { oldCursor = label.getCursor(); label.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR)); } } public void mouseExited(MouseEvent evt) { JLabel label = (JLabel)evt.getSource(); if (oldCursor != null) { label.setCursor(oldCursor); oldCursor = null; } } }}⌨️ 快捷键说明
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