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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/awt/peer/gtk/GtkClipboard.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/awt/peer/gtk/GtkClipboard.java')
-rw-r--r-- | libjava/classpath/gnu/java/awt/peer/gtk/GtkClipboard.java | 436 |
1 files changed, 436 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/awt/peer/gtk/GtkClipboard.java b/libjava/classpath/gnu/java/awt/peer/gtk/GtkClipboard.java new file mode 100644 index 000000000..4250cabaa --- /dev/null +++ b/libjava/classpath/gnu/java/awt/peer/gtk/GtkClipboard.java @@ -0,0 +1,436 @@ +/* GtkClipboard.java + Copyright (C) 1999, 2005, 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.awt.peer.gtk; + +import gnu.java.lang.CPStringBuilder; + +import java.awt.Image; + +import java.awt.datatransfer.Clipboard; +import java.awt.datatransfer.ClipboardOwner; +import java.awt.datatransfer.DataFlavor; +import java.awt.datatransfer.StringSelection; +import java.awt.datatransfer.Transferable; +import java.awt.datatransfer.UnsupportedFlavorException; + +import java.io.ByteArrayOutputStream; +import java.io.File; +import java.io.InputStream; +import java.io.IOException; +import java.io.ObjectOutputStream; +import java.io.Reader; +import java.io.Serializable; +import java.io.UnsupportedEncodingException; + +import java.util.List; +import java.util.Iterator; + +public class GtkClipboard extends Clipboard +{ + /** + * The one and only gtk+ clipboard instance for the CLIPBOARD selection. + */ + final static GtkClipboard clipboard = new GtkClipboard("System Clipboard"); + + /** + * The one and only gtk+ clipboard instance for the PRIMARY selection. + */ + final static GtkClipboard selection = new GtkClipboard("System Selection"); + + // Given to the native side so it can signal special targets that + // can be converted to one of the special predefined DataFlavors. + static final String stringMimeType + = DataFlavor.stringFlavor.getMimeType(); + static final String imageMimeType + = DataFlavor.imageFlavor.getMimeType(); + static final String filesMimeType + = DataFlavor.javaFileListFlavor.getMimeType(); + + // Indicates whether the results of the clipboard selection can be + // cached by GtkSelection. True if + // gdk_display_supports_selection_notification. + static final boolean canCache = initNativeState(clipboard, selection, + stringMimeType, + imageMimeType, + filesMimeType); + + /** + * Creates the clipboard and sets the initial contents to the + * current gtk+ selection. + */ + private GtkClipboard(String name) + { + super(name); + setContents(new GtkSelection(this), null); + } + + /** + * Returns the one and only GtkClipboard instance for the CLIPBOARD + * selection. + */ + static GtkClipboard getClipboardInstance() + { + return clipboard; + } + + /** + * Returns the one and only GtkClipboard instance for the PRIMARY + * selection. + */ + static GtkClipboard getSelectionInstance() + { + return selection; + } + + /** + * Sets the GtkSelection facade as new contents of the clipboard. + * Called from gtk+ when another application grabs the clipboard and + * we loose ownership. + * + * @param cleared If true this is a clear event (someone takes the + * clipboard from us) otherwise it is an owner changed event. + */ + private synchronized void setSystemContents(boolean cleared) + { + // We need to notify clipboard owner listeners when we were the + // owner (the selection was explictly set) and someone takes the + // clipboard away from us and asks us the clear any held storage, + // or if we weren't the owner of the clipboard to begin with, but + // the clipboard contents changed. We could refine this and check + // whether the actual available formats did in fact change, but we + // assume listeners will check for that anyway (and if possible we + // ask to cache the available formats so even if multiple + // listeners check after a notification the overhead should be + // minimal). + boolean owner = ! (contents instanceof GtkSelection); + boolean needNotification = (cleared && owner) || (! cleared && ! owner); + if (needNotification) + GtkClipboardNotifier.announce(this); + } + + /** + * Sets the new contents and advertises the available flavors to the + * gtk+ clipboard. + */ + public synchronized void setContents(Transferable contents, + ClipboardOwner owner) + { + super.setContents(contents, owner); + + if (contents == null) + { + advertiseContent(null, false, false, false); + return; + } + + // We don't need to do anything for a GtkSelection facade. + if (contents instanceof GtkSelection) + return; + + boolean text = false; + boolean images = false; + boolean files = false; + + if (contents instanceof StringSelection + || contents.isDataFlavorSupported(DataFlavor.stringFlavor) + || contents.isDataFlavorSupported(DataFlavor.plainTextFlavor) + || contents.isDataFlavorSupported(DataFlavor.getTextPlainUnicodeFlavor())) + text = true; + + DataFlavor[] flavors = contents.getTransferDataFlavors(); + String[] mimeTargets = new String[flavors.length]; + for (int i = 0; i < flavors.length; i++) + { + DataFlavor flavor = flavors[i]; + String mimeType = flavor.getMimeType(); + mimeTargets[i] = mimeType; + + if (! text) + if ("text".equals(flavor.getPrimaryType()) + || flavor.isRepresentationClassReader()) + text = true; + + if (! images && flavors[i].equals(DataFlavor.imageFlavor)) + { + try + { + Object o = contents.getTransferData(DataFlavor.imageFlavor); + if (o instanceof Image) + images = true; + } + catch (UnsupportedFlavorException ufe) + { + } + catch (IOException ioe) + { + } + catch (ClassCastException cce) + { + } + } + + if (flavors[i].equals(DataFlavor.javaFileListFlavor)) + files = true; + } + + advertiseContent(mimeTargets, text, images, files); + } + + /** + * Advertises new contents to the gtk+ clipboard given a string + * array of (mime-type) targets. When the boolean flags text, images + * and/or files are set then gtk+ is asked to also advertise the + * availability of any text, image or uri/file content types it + * supports. If targets is null (and all flags false) then the + * selection has explicitly been erased. + */ + private native void advertiseContent(String[] targets, + boolean text, + boolean images, + boolean files); + + /** + * Called by the gtk+ clipboard when an application has requested + * text. Return a string representing the current clipboard + * contents or null when no text can be provided. + */ + private String provideText() + { + Transferable contents = this.contents; + if (contents == null || contents instanceof GtkSelection) + return null; + + // Handle StringSelection special since that is just pure text. + if (contents instanceof StringSelection) + { + try + { + return (String) contents.getTransferData(DataFlavor.stringFlavor); + } + catch (UnsupportedFlavorException ufe) + { + } + catch (IOException ioe) + { + } + catch (ClassCastException cce) + { + } + } + + // Try to get a plain text reader for the current contents and + // turn the result into a string. + try + { + DataFlavor plainText = DataFlavor.getTextPlainUnicodeFlavor(); + Reader r = plainText.getReaderForText(contents); + if (r != null) + { + CPStringBuilder sb = new CPStringBuilder(); + char[] cs = new char[1024]; + int l = r.read(cs); + while (l != -1) + { + sb.append(cs, 0, l); + l = r.read(cs); + } + return sb.toString(); + } + } + catch (IllegalArgumentException iae) + { + } + catch (UnsupportedEncodingException iee) + { + } + catch (UnsupportedFlavorException ufe) + { + } + catch (IOException ioe) + { + } + + return null; + } + + /** + * Called by the gtk+ clipboard when an application has requested an + * image. Returns a GtkImage representing the current clipboard + * contents or null when no image can be provided. + */ + private GtkImage provideImage() + { + Transferable contents = this.contents; + if (contents == null || contents instanceof GtkSelection) + return null; + + try + { + Object o = contents.getTransferData(DataFlavor.imageFlavor); + if( o instanceof GtkImage ) + return (GtkImage) o; + else + return new GtkImage(((Image)o).getSource()); + } + catch (UnsupportedFlavorException ufe) + { + } + catch (IOException ioe) + { + } + catch (ClassCastException cce) + { + } + + return null; + } + + /** + * Called by the gtk+ clipboard when an application has requested a + * uri-list. Return a string array containing the URIs representing + * the current clipboard contents or null when no URIs can be + * provided. + */ + private String[] provideURIs() + { + Transferable contents = this.contents; + if (contents == null || contents instanceof GtkSelection) + return null; + + try + { + List list = (List) contents.getTransferData(DataFlavor.javaFileListFlavor); + String[] uris = new String[list.size()]; + int u = 0; + Iterator it = list.iterator(); + while (it.hasNext()) + uris[u++] = ((File) it.next()).toURI().toString(); + return uris; + } + catch (UnsupportedFlavorException ufe) + { + } + catch (IOException ioe) + { + } + catch (ClassCastException cce) + { + } + + return null; + } + + /** + * Called by gtk+ clipboard when an application requests the given + * target mime-type. Returns a byte array containing the requested + * data, or null when the contents cannot be provided in the + * requested target mime-type. Only called after any explicit text, + * image or file/uri requests have been handled earlier and failed. + */ + private byte[] provideContent(String target) + { + // Sanity check. The callback could be triggered just after we + // changed the clipboard. + Transferable contents = this.contents; + if (contents == null || contents instanceof GtkSelection) + return null; + + // XXX - We are being called from a gtk+ callback. Which means we + // should return as soon as possible and not call arbitrary code + // that could deadlock or go bonkers. But we don't really know + // what DataTransfer contents object we are dealing with. Same for + // the other provideXXX() methods. + try + { + DataFlavor flavor = new DataFlavor(target); + Object o = contents.getTransferData(flavor); + + if (o instanceof byte[]) + return (byte[]) o; + + if (o instanceof InputStream) + { + InputStream is = (InputStream) o; + ByteArrayOutputStream baos = new ByteArrayOutputStream(); + byte[] bs = new byte[1024]; + int l = is.read(bs); + while (l != -1) + { + baos.write(bs, 0, l); + l = is.read(bs); + } + return baos.toByteArray(); + } + + if (o instanceof Serializable) + { + ByteArrayOutputStream baos = new ByteArrayOutputStream(); + ObjectOutputStream oos = new ObjectOutputStream(baos); + oos.writeObject(o); + oos.close(); + return baos.toByteArray(); + } + } + catch (ClassNotFoundException cnfe) + { + } + catch (UnsupportedFlavorException ufe) + { + } + catch (IOException ioe) + { + } + catch (ClassCastException cce) + { + } + + return null; + } + + /** + * Initializes the gtk+ clipboards and caches any native side + * structures needed. Returns whether or not the contents of the + * Clipboard can be cached (gdk_display_supports_selection_notification). + */ + private static native boolean initNativeState(GtkClipboard clipboard, + GtkClipboard selection, + String stringTarget, + String imageTarget, + String filesTarget); +} |