| /* |
| * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package javax.swing.text.html; |
| |
| import java.awt.*; |
| import java.awt.image.ImageObserver; |
| import java.net.*; |
| import java.util.Dictionary; |
| import javax.swing.*; |
| import javax.swing.text.*; |
| import javax.swing.event.*; |
| |
| /** |
| * View of an Image, intended to support the HTML <IMG> tag. |
| * Supports scaling via the HEIGHT and WIDTH attributes of the tag. |
| * If the image is unable to be loaded any text specified via the |
| * <code>ALT</code> attribute will be rendered. |
| * <p> |
| * While this class has been part of swing for a while now, it is public |
| * as of 1.4. |
| * |
| * @author Scott Violet |
| * @see IconView |
| * @since 1.4 |
| */ |
| public class ImageView extends View { |
| /** |
| * If true, when some of the bits are available a repaint is done. |
| * <p> |
| * This is set to false as swing does not offer a repaint that takes a |
| * delay. If this were true, a bunch of immediate repaints would get |
| * generated that end up significantly delaying the loading of the image |
| * (or anything else going on for that matter). |
| */ |
| private static boolean sIsInc = false; |
| /** |
| * Repaint delay when some of the bits are available. |
| */ |
| private static int sIncRate = 100; |
| /** |
| * Property name for pending image icon |
| */ |
| private static final String PENDING_IMAGE = "html.pendingImage"; |
| /** |
| * Property name for missing image icon |
| */ |
| private static final String MISSING_IMAGE = "html.missingImage"; |
| |
| /** |
| * Document property for image cache. |
| */ |
| private static final String IMAGE_CACHE_PROPERTY = "imageCache"; |
| |
| // Height/width to use before we know the real size, these should at least |
| // the size of <code>sMissingImageIcon</code> and |
| // <code>sPendingImageIcon</code> |
| private static final int DEFAULT_WIDTH = 38; |
| private static final int DEFAULT_HEIGHT= 38; |
| |
| /** |
| * Default border to use if one is not specified. |
| */ |
| private static final int DEFAULT_BORDER = 2; |
| |
| // Bitmask values |
| private static final int LOADING_FLAG = 1; |
| private static final int LINK_FLAG = 2; |
| private static final int WIDTH_FLAG = 4; |
| private static final int HEIGHT_FLAG = 8; |
| private static final int RELOAD_FLAG = 16; |
| private static final int RELOAD_IMAGE_FLAG = 32; |
| private static final int SYNC_LOAD_FLAG = 64; |
| |
| private AttributeSet attr; |
| private Image image; |
| private Image disabledImage; |
| private int width; |
| private int height; |
| /** Bitmask containing some of the above bitmask values. Because the |
| * image loading notification can happen on another thread access to |
| * this is synchronized (at least for modifying it). */ |
| private int state; |
| private Container container; |
| private Rectangle fBounds; |
| private Color borderColor; |
| // Size of the border, the insets contains this valid. For example, if |
| // the HSPACE attribute was 4 and BORDER 2, leftInset would be 6. |
| private short borderSize; |
| // Insets, obtained from the painter. |
| private short leftInset; |
| private short rightInset; |
| private short topInset; |
| private short bottomInset; |
| /** |
| * We don't directly implement ImageObserver, instead we use an instance |
| * that calls back to us. |
| */ |
| private ImageObserver imageObserver; |
| /** |
| * Used for alt text. Will be non-null if the image couldn't be found, |
| * and there is valid alt text. |
| */ |
| private View altView; |
| /** Alignment along the vertical (Y) axis. */ |
| private float vAlign; |
| |
| |
| |
| /** |
| * Creates a new view that represents an IMG element. |
| * |
| * @param elem the element to create a view for |
| */ |
| public ImageView(Element elem) { |
| super(elem); |
| fBounds = new Rectangle(); |
| imageObserver = new ImageHandler(); |
| state = RELOAD_FLAG | RELOAD_IMAGE_FLAG; |
| } |
| |
| /** |
| * Returns the text to display if the image cannot be loaded. This is |
| * obtained from the Elements attribute set with the attribute name |
| * <code>HTML.Attribute.ALT</code>. |
| * |
| * @return the test to display if the image cannot be loaded. |
| */ |
| public String getAltText() { |
| return (String)getElement().getAttributes().getAttribute |
| (HTML.Attribute.ALT); |
| } |
| |
| /** |
| * Return a URL for the image source, |
| * or null if it could not be determined. |
| * |
| * @return the URL for the image source, or null if it could not be determined. |
| */ |
| public URL getImageURL() { |
| String src = (String)getElement().getAttributes(). |
| getAttribute(HTML.Attribute.SRC); |
| if (src == null) { |
| return null; |
| } |
| |
| URL reference = ((HTMLDocument)getDocument()).getBase(); |
| try { |
| URL u = new URL(reference,src); |
| return u; |
| } catch (MalformedURLException e) { |
| return null; |
| } |
| } |
| |
| /** |
| * Returns the icon to use if the image could not be found. |
| * |
| * @return the icon to use if the image could not be found. |
| */ |
| public Icon getNoImageIcon() { |
| return (Icon) UIManager.getLookAndFeelDefaults().get(MISSING_IMAGE); |
| } |
| |
| /** |
| * Returns the icon to use while in the process of loading the image. |
| * |
| * @return the icon to use while in the process of loading the image. |
| */ |
| public Icon getLoadingImageIcon() { |
| return (Icon) UIManager.getLookAndFeelDefaults().get(PENDING_IMAGE); |
| } |
| |
| /** |
| * Returns the image to render. |
| * |
| * @return the image to render. |
| */ |
| public Image getImage() { |
| sync(); |
| return image; |
| } |
| |
| private Image getImage(boolean enabled) { |
| Image img = getImage(); |
| if (! enabled) { |
| if (disabledImage == null) { |
| disabledImage = GrayFilter.createDisabledImage(img); |
| } |
| img = disabledImage; |
| } |
| return img; |
| } |
| |
| /** |
| * Sets how the image is loaded. If <code>newValue</code> is true, |
| * the image will be loaded when first asked for, otherwise it will |
| * be loaded asynchronously. The default is to not load synchronously, |
| * that is to load the image asynchronously. |
| * |
| * @param newValue if {@code true} the image will be loaded when first asked for, |
| * otherwise it will be asynchronously. |
| */ |
| public void setLoadsSynchronously(boolean newValue) { |
| synchronized(this) { |
| if (newValue) { |
| state |= SYNC_LOAD_FLAG; |
| } |
| else { |
| state = (state | SYNC_LOAD_FLAG) ^ SYNC_LOAD_FLAG; |
| } |
| } |
| } |
| |
| /** |
| * Returns {@code true} if the image should be loaded when first asked for. |
| * |
| * @return {@code true} if the image should be loaded when first asked for. |
| */ |
| public boolean getLoadsSynchronously() { |
| return ((state & SYNC_LOAD_FLAG) != 0); |
| } |
| |
| /** |
| * Convenient method to get the StyleSheet. |
| * |
| * @return the StyleSheet |
| */ |
| protected StyleSheet getStyleSheet() { |
| HTMLDocument doc = (HTMLDocument) getDocument(); |
| return doc.getStyleSheet(); |
| } |
| |
| /** |
| * Fetches the attributes to use when rendering. This is |
| * implemented to multiplex the attributes specified in the |
| * model with a StyleSheet. |
| */ |
| public AttributeSet getAttributes() { |
| sync(); |
| return attr; |
| } |
| |
| /** |
| * For images the tooltip text comes from text specified with the |
| * <code>ALT</code> attribute. This is overriden to return |
| * <code>getAltText</code>. |
| * |
| * @see JTextComponent#getToolTipText |
| */ |
| public String getToolTipText(float x, float y, Shape allocation) { |
| return getAltText(); |
| } |
| |
| /** |
| * Update any cached values that come from attributes. |
| */ |
| protected void setPropertiesFromAttributes() { |
| StyleSheet sheet = getStyleSheet(); |
| this.attr = sheet.getViewAttributes(this); |
| |
| // Gutters |
| borderSize = (short)getIntAttr(HTML.Attribute.BORDER, isLink() ? |
| DEFAULT_BORDER : 0); |
| |
| leftInset = rightInset = (short)(getIntAttr(HTML.Attribute.HSPACE, |
| 0) + borderSize); |
| topInset = bottomInset = (short)(getIntAttr(HTML.Attribute.VSPACE, |
| 0) + borderSize); |
| |
| borderColor = ((StyledDocument)getDocument()).getForeground |
| (getAttributes()); |
| |
| AttributeSet attr = getElement().getAttributes(); |
| |
| // Alignment. |
| // PENDING: This needs to be changed to support the CSS versions |
| // when conversion from ALIGN to VERTICAL_ALIGN is complete. |
| Object alignment = attr.getAttribute(HTML.Attribute.ALIGN); |
| |
| vAlign = 1.0f; |
| if (alignment != null) { |
| alignment = alignment.toString(); |
| if ("top".equals(alignment)) { |
| vAlign = 0f; |
| } |
| else if ("middle".equals(alignment)) { |
| vAlign = .5f; |
| } |
| } |
| |
| AttributeSet anchorAttr = (AttributeSet)attr.getAttribute(HTML.Tag.A); |
| if (anchorAttr != null && anchorAttr.isDefined |
| (HTML.Attribute.HREF)) { |
| synchronized(this) { |
| state |= LINK_FLAG; |
| } |
| } |
| else { |
| synchronized(this) { |
| state = (state | LINK_FLAG) ^ LINK_FLAG; |
| } |
| } |
| } |
| |
| /** |
| * Establishes the parent view for this view. |
| * Seize this moment to cache the AWT Container I'm in. |
| */ |
| public void setParent(View parent) { |
| View oldParent = getParent(); |
| super.setParent(parent); |
| container = (parent != null) ? getContainer() : null; |
| if (oldParent != parent) { |
| synchronized(this) { |
| state |= RELOAD_FLAG; |
| } |
| } |
| } |
| |
| /** |
| * Invoked when the Elements attributes have changed. Recreates the image. |
| */ |
| public void changedUpdate(DocumentEvent e, Shape a, ViewFactory f) { |
| super.changedUpdate(e,a,f); |
| |
| synchronized(this) { |
| state |= RELOAD_FLAG | RELOAD_IMAGE_FLAG; |
| } |
| |
| // Assume the worst. |
| preferenceChanged(null, true, true); |
| } |
| |
| /** |
| * Paints the View. |
| * |
| * @param g the rendering surface to use |
| * @param a the allocated region to render into |
| * @see View#paint |
| */ |
| public void paint(Graphics g, Shape a) { |
| sync(); |
| |
| Rectangle rect = (a instanceof Rectangle) ? (Rectangle)a : |
| a.getBounds(); |
| Rectangle clip = g.getClipBounds(); |
| |
| fBounds.setBounds(rect); |
| paintHighlights(g, a); |
| paintBorder(g, rect); |
| if (clip != null) { |
| g.clipRect(rect.x + leftInset, rect.y + topInset, |
| rect.width - leftInset - rightInset, |
| rect.height - topInset - bottomInset); |
| } |
| |
| Container host = getContainer(); |
| Image img = getImage(host == null || host.isEnabled()); |
| if (img != null) { |
| if (! hasPixels(img)) { |
| // No pixels yet, use the default |
| Icon icon = getLoadingImageIcon(); |
| if (icon != null) { |
| icon.paintIcon(host, g, |
| rect.x + leftInset, rect.y + topInset); |
| } |
| } |
| else { |
| // Draw the image |
| g.drawImage(img, rect.x + leftInset, rect.y + topInset, |
| width, height, imageObserver); |
| } |
| } |
| else { |
| Icon icon = getNoImageIcon(); |
| if (icon != null) { |
| icon.paintIcon(host, g, |
| rect.x + leftInset, rect.y + topInset); |
| } |
| View view = getAltView(); |
| // Paint the view representing the alt text, if its non-null |
| if (view != null && ((state & WIDTH_FLAG) == 0 || |
| width > DEFAULT_WIDTH)) { |
| // Assume layout along the y direction |
| Rectangle altRect = new Rectangle |
| (rect.x + leftInset + DEFAULT_WIDTH, rect.y + topInset, |
| rect.width - leftInset - rightInset - DEFAULT_WIDTH, |
| rect.height - topInset - bottomInset); |
| |
| view.paint(g, altRect); |
| } |
| } |
| if (clip != null) { |
| // Reset clip. |
| g.setClip(clip.x, clip.y, clip.width, clip.height); |
| } |
| } |
| |
| private void paintHighlights(Graphics g, Shape shape) { |
| if (container instanceof JTextComponent) { |
| JTextComponent tc = (JTextComponent)container; |
| Highlighter h = tc.getHighlighter(); |
| if (h instanceof LayeredHighlighter) { |
| ((LayeredHighlighter)h).paintLayeredHighlights |
| (g, getStartOffset(), getEndOffset(), shape, tc, this); |
| } |
| } |
| } |
| |
| private void paintBorder(Graphics g, Rectangle rect) { |
| Color color = borderColor; |
| |
| if ((borderSize > 0 || image == null) && color != null) { |
| int xOffset = leftInset - borderSize; |
| int yOffset = topInset - borderSize; |
| g.setColor(color); |
| int n = (image == null) ? 1 : borderSize; |
| for (int counter = 0; counter < n; counter++) { |
| g.drawRect(rect.x + xOffset + counter, |
| rect.y + yOffset + counter, |
| rect.width - counter - counter - xOffset -xOffset-1, |
| rect.height - counter - counter -yOffset-yOffset-1); |
| } |
| } |
| } |
| |
| /** |
| * Determines the preferred span for this view along an |
| * axis. |
| * |
| * @param axis may be either X_AXIS or Y_AXIS |
| * @return the span the view would like to be rendered into; |
| * typically the view is told to render into the span |
| * that is returned, although there is no guarantee; |
| * the parent may choose to resize or break the view |
| */ |
| public float getPreferredSpan(int axis) { |
| sync(); |
| |
| // If the attributes specified a width/height, always use it! |
| if (axis == View.X_AXIS && (state & WIDTH_FLAG) == WIDTH_FLAG) { |
| getPreferredSpanFromAltView(axis); |
| return width + leftInset + rightInset; |
| } |
| if (axis == View.Y_AXIS && (state & HEIGHT_FLAG) == HEIGHT_FLAG) { |
| getPreferredSpanFromAltView(axis); |
| return height + topInset + bottomInset; |
| } |
| |
| Image image = getImage(); |
| |
| if (image != null) { |
| switch (axis) { |
| case View.X_AXIS: |
| return width + leftInset + rightInset; |
| case View.Y_AXIS: |
| return height + topInset + bottomInset; |
| default: |
| throw new IllegalArgumentException("Invalid axis: " + axis); |
| } |
| } |
| else { |
| View view = getAltView(); |
| float retValue = 0f; |
| |
| if (view != null) { |
| retValue = view.getPreferredSpan(axis); |
| } |
| switch (axis) { |
| case View.X_AXIS: |
| return retValue + (float)(width + leftInset + rightInset); |
| case View.Y_AXIS: |
| return retValue + (float)(height + topInset + bottomInset); |
| default: |
| throw new IllegalArgumentException("Invalid axis: " + axis); |
| } |
| } |
| } |
| |
| /** |
| * Determines the desired alignment for this view along an |
| * axis. This is implemented to give the alignment to the |
| * bottom of the icon along the y axis, and the default |
| * along the x axis. |
| * |
| * @param axis may be either X_AXIS or Y_AXIS |
| * @return the desired alignment; this should be a value |
| * between 0.0 and 1.0 where 0 indicates alignment at the |
| * origin and 1.0 indicates alignment to the full span |
| * away from the origin; an alignment of 0.5 would be the |
| * center of the view |
| */ |
| public float getAlignment(int axis) { |
| switch (axis) { |
| case View.Y_AXIS: |
| return vAlign; |
| default: |
| return super.getAlignment(axis); |
| } |
| } |
| |
| /** |
| * Provides a mapping from the document model coordinate space |
| * to the coordinate space of the view mapped to it. |
| * |
| * @param pos the position to convert |
| * @param a the allocated region to render into |
| * @return the bounding box of the given position |
| * @exception BadLocationException if the given position does not represent a |
| * valid location in the associated document |
| * @see View#modelToView |
| */ |
| public Shape modelToView(int pos, Shape a, Position.Bias b) throws BadLocationException { |
| int p0 = getStartOffset(); |
| int p1 = getEndOffset(); |
| if ((pos >= p0) && (pos <= p1)) { |
| Rectangle r = a.getBounds(); |
| if (pos == p1) { |
| r.x += r.width; |
| } |
| r.width = 0; |
| return r; |
| } |
| return null; |
| } |
| |
| /** |
| * Provides a mapping from the view coordinate space to the logical |
| * coordinate space of the model. |
| * |
| * @param x the X coordinate |
| * @param y the Y coordinate |
| * @param a the allocated region to render into |
| * @return the location within the model that best represents the |
| * given point of view |
| * @see View#viewToModel |
| */ |
| public int viewToModel(float x, float y, Shape a, Position.Bias[] bias) { |
| Rectangle alloc = (Rectangle) a; |
| if (x < alloc.x + alloc.width) { |
| bias[0] = Position.Bias.Forward; |
| return getStartOffset(); |
| } |
| bias[0] = Position.Bias.Backward; |
| return getEndOffset(); |
| } |
| |
| /** |
| * Sets the size of the view. This should cause |
| * layout of the view if it has any layout duties. |
| * |
| * @param width the width >= 0 |
| * @param height the height >= 0 |
| */ |
| public void setSize(float width, float height) { |
| sync(); |
| |
| if (getImage() == null) { |
| View view = getAltView(); |
| |
| if (view != null) { |
| view.setSize(Math.max(0f, width - (float)(DEFAULT_WIDTH + leftInset + rightInset)), |
| Math.max(0f, height - (float)(topInset + bottomInset))); |
| } |
| } |
| } |
| |
| /** |
| * Returns true if this image within a link? |
| */ |
| private boolean isLink() { |
| return ((state & LINK_FLAG) == LINK_FLAG); |
| } |
| |
| /** |
| * Returns true if the passed in image has a non-zero width and height. |
| */ |
| private boolean hasPixels(Image image) { |
| return image != null && |
| (image.getHeight(imageObserver) > 0) && |
| (image.getWidth(imageObserver) > 0); |
| } |
| |
| /** |
| * Returns the preferred span of the View used to display the alt text, |
| * or 0 if the view does not exist. |
| */ |
| private float getPreferredSpanFromAltView(int axis) { |
| if (getImage() == null) { |
| View view = getAltView(); |
| |
| if (view != null) { |
| return view.getPreferredSpan(axis); |
| } |
| } |
| return 0f; |
| } |
| |
| /** |
| * Request that this view be repainted. |
| * Assumes the view is still at its last-drawn location. |
| */ |
| private void repaint(long delay) { |
| if (container != null && fBounds != null) { |
| container.repaint(delay, fBounds.x, fBounds.y, fBounds.width, |
| fBounds.height); |
| } |
| } |
| |
| /** |
| * Convenient method for getting an integer attribute from the elements |
| * AttributeSet. |
| */ |
| private int getIntAttr(HTML.Attribute name, int deflt) { |
| AttributeSet attr = getElement().getAttributes(); |
| if (attr.isDefined(name)) { // does not check parents! |
| int i; |
| String val = (String)attr.getAttribute(name); |
| if (val == null) { |
| i = deflt; |
| } |
| else { |
| try{ |
| i = Math.max(0, Integer.parseInt(val)); |
| }catch( NumberFormatException x ) { |
| i = deflt; |
| } |
| } |
| return i; |
| } else |
| return deflt; |
| } |
| |
| /** |
| * Makes sure the necessary properties and image is loaded. |
| */ |
| private void sync() { |
| int s = state; |
| if ((s & RELOAD_IMAGE_FLAG) != 0) { |
| refreshImage(); |
| } |
| s = state; |
| if ((s & RELOAD_FLAG) != 0) { |
| synchronized(this) { |
| state = (state | RELOAD_FLAG) ^ RELOAD_FLAG; |
| } |
| setPropertiesFromAttributes(); |
| } |
| } |
| |
| /** |
| * Loads the image and updates the size accordingly. This should be |
| * invoked instead of invoking <code>loadImage</code> or |
| * <code>updateImageSize</code> directly. |
| */ |
| private void refreshImage() { |
| synchronized(this) { |
| // clear out width/height/realoadimage flag and set loading flag |
| state = (state | LOADING_FLAG | RELOAD_IMAGE_FLAG | WIDTH_FLAG | |
| HEIGHT_FLAG) ^ (WIDTH_FLAG | HEIGHT_FLAG | |
| RELOAD_IMAGE_FLAG); |
| image = null; |
| width = height = 0; |
| } |
| |
| try { |
| // Load the image |
| loadImage(); |
| |
| // And update the size params |
| updateImageSize(); |
| } |
| finally { |
| synchronized(this) { |
| // Clear out state in case someone threw an exception. |
| state = (state | LOADING_FLAG) ^ LOADING_FLAG; |
| } |
| } |
| } |
| |
| /** |
| * Loads the image from the URL <code>getImageURL</code>. This should |
| * only be invoked from <code>refreshImage</code>. |
| */ |
| private void loadImage() { |
| URL src = getImageURL(); |
| Image newImage = null; |
| if (src != null) { |
| @SuppressWarnings("unchecked") |
| Dictionary<URL, Image> cache = (Dictionary)getDocument(). |
| getProperty(IMAGE_CACHE_PROPERTY); |
| if (cache != null) { |
| newImage = cache.get(src); |
| } |
| else { |
| newImage = Toolkit.getDefaultToolkit().createImage(src); |
| if (newImage != null && getLoadsSynchronously()) { |
| // Force the image to be loaded by using an ImageIcon. |
| ImageIcon ii = new ImageIcon(); |
| ii.setImage(newImage); |
| } |
| } |
| } |
| image = newImage; |
| } |
| |
| /** |
| * Recreates and reloads the image. This should |
| * only be invoked from <code>refreshImage</code>. |
| */ |
| private void updateImageSize() { |
| int newWidth = 0; |
| int newHeight = 0; |
| int newState = 0; |
| Image newImage = getImage(); |
| |
| if (newImage != null) { |
| Element elem = getElement(); |
| AttributeSet attr = elem.getAttributes(); |
| |
| // Get the width/height and set the state ivar before calling |
| // anything that might cause the image to be loaded, and thus the |
| // ImageHandler to be called. |
| newWidth = getIntAttr(HTML.Attribute.WIDTH, -1); |
| if (newWidth > 0) { |
| newState |= WIDTH_FLAG; |
| } |
| newHeight = getIntAttr(HTML.Attribute.HEIGHT, -1); |
| if (newHeight > 0) { |
| newState |= HEIGHT_FLAG; |
| } |
| |
| if (newWidth <= 0) { |
| newWidth = newImage.getWidth(imageObserver); |
| if (newWidth <= 0) { |
| newWidth = DEFAULT_WIDTH; |
| } |
| } |
| |
| if (newHeight <= 0) { |
| newHeight = newImage.getHeight(imageObserver); |
| if (newHeight <= 0) { |
| newHeight = DEFAULT_HEIGHT; |
| } |
| } |
| |
| // Make sure the image starts loading: |
| if ((newState & (WIDTH_FLAG | HEIGHT_FLAG)) != 0) { |
| Toolkit.getDefaultToolkit().prepareImage(newImage, newWidth, |
| newHeight, |
| imageObserver); |
| } |
| else { |
| Toolkit.getDefaultToolkit().prepareImage(newImage, -1, -1, |
| imageObserver); |
| } |
| |
| boolean createText = false; |
| synchronized(this) { |
| // If imageloading failed, other thread may have called |
| // ImageLoader which will null out image, hence we check |
| // for it. |
| if (image != null) { |
| if ((newState & WIDTH_FLAG) == WIDTH_FLAG || width == 0) { |
| width = newWidth; |
| } |
| if ((newState & HEIGHT_FLAG) == HEIGHT_FLAG || |
| height == 0) { |
| height = newHeight; |
| } |
| } |
| else { |
| createText = true; |
| if ((newState & WIDTH_FLAG) == WIDTH_FLAG) { |
| width = newWidth; |
| } |
| if ((newState & HEIGHT_FLAG) == HEIGHT_FLAG) { |
| height = newHeight; |
| } |
| } |
| state = state | newState; |
| state = (state | LOADING_FLAG) ^ LOADING_FLAG; |
| } |
| if (createText) { |
| // Only reset if this thread determined image is null |
| updateAltTextView(); |
| } |
| } |
| else { |
| width = height = DEFAULT_HEIGHT; |
| updateAltTextView(); |
| } |
| } |
| |
| /** |
| * Updates the view representing the alt text. |
| */ |
| private void updateAltTextView() { |
| String text = getAltText(); |
| |
| if (text != null) { |
| ImageLabelView newView; |
| |
| newView = new ImageLabelView(getElement(), text); |
| synchronized(this) { |
| altView = newView; |
| } |
| } |
| } |
| |
| /** |
| * Returns the view to use for alternate text. This may be null. |
| */ |
| private View getAltView() { |
| View view; |
| |
| synchronized(this) { |
| view = altView; |
| } |
| if (view != null && view.getParent() == null) { |
| view.setParent(getParent()); |
| } |
| return view; |
| } |
| |
| /** |
| * Invokes <code>preferenceChanged</code> on the event displatching |
| * thread. |
| */ |
| private void safePreferenceChanged() { |
| if (SwingUtilities.isEventDispatchThread()) { |
| Document doc = getDocument(); |
| if (doc instanceof AbstractDocument) { |
| ((AbstractDocument)doc).readLock(); |
| } |
| preferenceChanged(null, true, true); |
| if (doc instanceof AbstractDocument) { |
| ((AbstractDocument)doc).readUnlock(); |
| } |
| } |
| else { |
| SwingUtilities.invokeLater(new Runnable() { |
| public void run() { |
| safePreferenceChanged(); |
| } |
| }); |
| } |
| } |
| |
| /** |
| * ImageHandler implements the ImageObserver to correctly update the |
| * display as new parts of the image become available. |
| */ |
| private class ImageHandler implements ImageObserver { |
| // This can come on any thread. If we are in the process of reloading |
| // the image and determining our state (loading == true) we don't fire |
| // preference changed, or repaint, we just reset the fWidth/fHeight as |
| // necessary and return. This is ok as we know when loading finishes |
| // it will pick up the new height/width, if necessary. |
| public boolean imageUpdate(Image img, int flags, int x, int y, |
| int newWidth, int newHeight ) { |
| if (img != image && img != disabledImage || |
| image == null || getParent() == null) { |
| |
| return false; |
| } |
| |
| // Bail out if there was an error: |
| if ((flags & (ABORT|ERROR)) != 0) { |
| repaint(0); |
| synchronized(ImageView.this) { |
| if (image == img) { |
| // Be sure image hasn't changed since we don't |
| // initialy synchronize |
| image = null; |
| if ((state & WIDTH_FLAG) != WIDTH_FLAG) { |
| width = DEFAULT_WIDTH; |
| } |
| if ((state & HEIGHT_FLAG) != HEIGHT_FLAG) { |
| height = DEFAULT_HEIGHT; |
| } |
| } else { |
| disabledImage = null; |
| } |
| if ((state & LOADING_FLAG) == LOADING_FLAG) { |
| // No need to resize or repaint, still in the process |
| // of loading. |
| return false; |
| } |
| } |
| updateAltTextView(); |
| safePreferenceChanged(); |
| return false; |
| } |
| |
| if (image == img) { |
| // Resize image if necessary: |
| short changed = 0; |
| if ((flags & ImageObserver.HEIGHT) != 0 && !getElement(). |
| getAttributes().isDefined(HTML.Attribute.HEIGHT)) { |
| changed |= 1; |
| } |
| if ((flags & ImageObserver.WIDTH) != 0 && !getElement(). |
| getAttributes().isDefined(HTML.Attribute.WIDTH)) { |
| changed |= 2; |
| } |
| |
| synchronized(ImageView.this) { |
| if ((changed & 1) == 1 && (state & WIDTH_FLAG) == 0) { |
| width = newWidth; |
| } |
| if ((changed & 2) == 2 && (state & HEIGHT_FLAG) == 0) { |
| height = newHeight; |
| } |
| if ((state & LOADING_FLAG) == LOADING_FLAG) { |
| // No need to resize or repaint, still in the process of |
| // loading. |
| return true; |
| } |
| } |
| if (changed != 0) { |
| // May need to resize myself, asynchronously: |
| safePreferenceChanged(); |
| return true; |
| } |
| } |
| |
| // Repaint when done or when new pixels arrive: |
| if ((flags & (FRAMEBITS|ALLBITS)) != 0) { |
| repaint(0); |
| } |
| else if ((flags & SOMEBITS) != 0 && sIsInc) { |
| repaint(sIncRate); |
| } |
| return ((flags & ALLBITS) == 0); |
| } |
| } |
| |
| |
| /** |
| * ImageLabelView is used if the image can't be loaded, and |
| * the attribute specified an alt attribute. It overriden a handle of |
| * methods as the text is hardcoded and does not come from the document. |
| */ |
| private class ImageLabelView extends InlineView { |
| private Segment segment; |
| private Color fg; |
| |
| ImageLabelView(Element e, String text) { |
| super(e); |
| reset(text); |
| } |
| |
| public void reset(String text) { |
| segment = new Segment(text.toCharArray(), 0, text.length()); |
| } |
| |
| public void paint(Graphics g, Shape a) { |
| // Don't use supers paint, otherwise selection will be wrong |
| // as our start/end offsets are fake. |
| GlyphPainter painter = getGlyphPainter(); |
| |
| if (painter != null) { |
| g.setColor(getForeground()); |
| painter.paint(this, g, a, getStartOffset(), getEndOffset()); |
| } |
| } |
| |
| public Segment getText(int p0, int p1) { |
| if (p0 < 0 || p1 > segment.array.length) { |
| throw new RuntimeException("ImageLabelView: Stale view"); |
| } |
| segment.offset = p0; |
| segment.count = p1 - p0; |
| return segment; |
| } |
| |
| public int getStartOffset() { |
| return 0; |
| } |
| |
| public int getEndOffset() { |
| return segment.array.length; |
| } |
| |
| public View breakView(int axis, int p0, float pos, float len) { |
| // Don't allow a break |
| return this; |
| } |
| |
| public Color getForeground() { |
| View parent; |
| if (fg == null && (parent = getParent()) != null) { |
| Document doc = getDocument(); |
| AttributeSet attr = parent.getAttributes(); |
| |
| if (attr != null && (doc instanceof StyledDocument)) { |
| fg = ((StyledDocument)doc).getForeground(attr); |
| } |
| } |
| return fg; |
| } |
| } |
| } |