| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.dnd; |
| |
| |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.internal.Converter; |
| import org.eclipse.swt.internal.gtk.GtkSelectionData; |
| import org.eclipse.swt.internal.gtk.OS; |
| import org.eclipse.swt.widgets.Display; |
| |
| /** |
| * The <code>Clipboard</code> provides a mechanism for transferring data from one |
| * application to another or within an application. |
| * |
| * <p>IMPORTANT: This class is <em>not</em> intended to be subclassed.</p> |
| */ |
| public class Clipboard { |
| |
| private Display display; |
| |
| static int /*long*/ GTKCLIPBOARD; |
| static int /*long*/ GTKPRIMARYCLIPBOARD; |
| private static int /*long*/ TARGET; |
| |
| static { |
| GTKCLIPBOARD = OS.gtk_clipboard_get(OS.GDK_NONE); |
| byte[] buffer = Converter.wcsToMbcs(null, "PRIMARY", true); |
| int /*long*/ primary = OS.gdk_atom_intern(buffer, false); |
| GTKPRIMARYCLIPBOARD = OS.gtk_clipboard_get(primary); |
| buffer = Converter.wcsToMbcs(null, "TARGETS", true); |
| TARGET = OS.gdk_atom_intern(buffer, false); |
| } |
| |
| /** |
| * Constructs a new instance of this class. Creating an instance of a Clipboard |
| * may cause system resources to be allocated depending on the platform. It is therefore |
| * mandatory that the Clipboard instance be disposed when no longer required. |
| * |
| * @param display the display on which to allocate the clipboard |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> |
| * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li> |
| * </ul> |
| * |
| * @see Clipboard#dispose |
| * @see Clipboard#checkSubclass |
| */ |
| public Clipboard(Display display) { |
| checkSubclass (); |
| if (display == null) { |
| display = Display.getCurrent(); |
| if (display == null) { |
| display = Display.getDefault(); |
| } |
| } |
| if (display.getThread() != Thread.currentThread()) { |
| DND.error(SWT.ERROR_THREAD_INVALID_ACCESS); |
| } |
| this.display = display; |
| } |
| |
| /** |
| * Checks that this class can be subclassed. |
| * <p> |
| * The SWT class library is intended to be subclassed |
| * only at specific, controlled points. This method enforces this |
| * rule unless it is overridden. |
| * </p><p> |
| * <em>IMPORTANT:</em> By providing an implementation of this |
| * method that allows a subclass of a class which does not |
| * normally allow subclassing to be created, the implementer |
| * agrees to be fully responsible for the fact that any such |
| * subclass will likely fail between SWT releases and will be |
| * strongly platform specific. No support is provided for |
| * user-written classes which are implemented in this fashion. |
| * </p><p> |
| * The ability to subclass outside of the allowed SWT classes |
| * is intended purely to enable those not on the SWT development |
| * team to implement patches in order to get around specific |
| * limitations in advance of when those limitations can be |
| * addressed by the team. Subclassing should not be attempted |
| * without an intimate and detailed understanding of the hierarchy. |
| * </p> |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li> |
| * </ul> |
| */ |
| protected void checkSubclass () { |
| String name = getClass().getName (); |
| String validName = Clipboard.class.getName(); |
| if (!validName.equals(name)) { |
| DND.error (SWT.ERROR_INVALID_SUBCLASS); |
| } |
| } |
| /** |
| * Throws an <code>SWTException</code> if the receiver can not |
| * be accessed by the caller. This may include both checks on |
| * the state of the receiver and more generally on the entire |
| * execution context. This method <em>should</em> be called by |
| * widget implementors to enforce the standard SWT invariants. |
| * <p> |
| * Currently, it is an error to invoke any method (other than |
| * <code>isDisposed()</code>) on a widget that has had its |
| * <code>dispose()</code> method called. It is also an error |
| * to call widget methods from any thread that is different |
| * from the thread that created the widget. |
| * </p><p> |
| * In future releases of SWT, there may be more or fewer error |
| * checks and exceptions may be thrown for different reasons. |
| * </p> |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| protected void checkWidget () { |
| Display display = this.display; |
| if (display == null) DND.error (SWT.ERROR_WIDGET_DISPOSED); |
| if (display.getThread() != Thread.currentThread ()) DND.error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| if (display.isDisposed()) DND.error(SWT.ERROR_WIDGET_DISPOSED); |
| } |
| |
| /** |
| * Disposes of the operating system resources associated with the clipboard. |
| * The data will still be available on the system clipboard after the dispose |
| * method is called. |
| * |
| * <p>NOTE: On some platforms the data will not be available once the application |
| * has exited or the display has been disposed.</p> |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> |
| * </ul> |
| */ |
| public void dispose () { |
| if (isDisposed()) return; |
| if (display.getThread() != Thread.currentThread()) DND.error(SWT.ERROR_THREAD_INVALID_ACCESS); |
| display = null; |
| } |
| |
| /** |
| * Retrieve the data of the specified type currently available on the system clipboard. Refer to the |
| * specific subclass of <code>Tramsfer</code> to determine the type of object returned. |
| * |
| * <p>The following snippet shows text and RTF text being retrieved from the clipboard:</p> |
| * |
| * <code><pre> |
| * Clipboard clipboard = new Clipboard(display); |
| * TextTransfer textTransfer = TextTransfer.getInstance(); |
| * String textData = (String)clipboard.getContents(textTransfer); |
| * if (textData != null) System.out.println("Text is "+textData); |
| * RTFTransfer rtfTransfer = RTFTransfer.getInstance(); |
| * String rtfData = (String)clipboard.getContents(rtfTransfer); |
| * if (rtfData != null) System.out.println("RTF Text is "+rtfData); |
| * clipboard.dispose(); |
| * </code></pre> |
| * |
| * @see Transfer |
| * |
| * @param transfer the transfer agent for the type of data being requested |
| * |
| * @return the data obtained from the clipboard or null if no data of this type is available |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if transfer is null</li> |
| * </ul> |
| */ |
| public Object getContents(Transfer transfer) { |
| checkWidget(); |
| if (transfer == null) DND.error(SWT.ERROR_NULL_ARGUMENT); |
| int /*long*/ selection_data = 0; |
| int[] typeIds = transfer.getTypeIds(); |
| for (int i = 0; i < typeIds.length; i++) { |
| // try the primary selection first |
| selection_data = gtk_clipboard_wait_for_contents(GTKPRIMARYCLIPBOARD, typeIds[i]); |
| if( selection_data != 0) break; |
| }; |
| if (selection_data == 0) { |
| // try the clipboard selection second |
| for (int i = 0; i < typeIds.length; i++) { |
| selection_data = gtk_clipboard_wait_for_contents(GTKCLIPBOARD, typeIds[i]); |
| if( selection_data != 0) break; |
| }; |
| } |
| if (selection_data == 0) { |
| return null; // No data available for this transfer |
| } |
| |
| GtkSelectionData gtkSelectionData = new GtkSelectionData(); |
| OS.memmove(gtkSelectionData, selection_data, GtkSelectionData.sizeof); |
| TransferData tdata = new TransferData(); |
| tdata.type = gtkSelectionData.target; |
| tdata.pValue = gtkSelectionData.data; |
| tdata.length = gtkSelectionData.length; |
| tdata.format = gtkSelectionData.format; |
| Object result = transfer.nativeToJava(tdata); |
| OS.gtk_selection_data_free(selection_data); |
| return result; |
| } |
| |
| /** |
| * Returns <code>true</code> if the clipboard has been disposed, |
| * and <code>false</code> otherwise. |
| * <p> |
| * This method gets the dispose state for the clipboard. |
| * When a clipboard has been disposed, it is an error to |
| * invoke any other method using the clipboard. |
| * </p> |
| * |
| * @return <code>true</code> when the widget is disposed and <code>false</code> otherwise |
| * |
| * @since 3.0 |
| */ |
| public boolean isDisposed () { |
| return (display == null); |
| } |
| |
| /** |
| * Place data of the specified type on the system clipboard. More than one type of |
| * data can be placed on the system clipboard at the same time. Setting the data |
| * clears any previous data of the same type from the system clipboard and also |
| * clears data of any other type currently on the system clipboard. |
| * |
| * <p>NOTE: On some platforms, the data is immediately copied to the system |
| * clipboard but on other platforms it is provided upon request. As a result, if the |
| * application modifes the data object it has set on the clipboard, that modification |
| * may or may not be available when the data is subsequently requested.</p> |
| * |
| * <p>The following snippet shows text and RTF text being set on the clipboard:</p> |
| * |
| * <code><pre> |
| * Clipboard clipboard = new Clipboard(display); |
| * String textData = "Hello World"; |
| * String rtfData = "{\\rtf1\\b\\i Hello World}"; |
| * TextTransfer textTransfer = TextTransfer.getInstance(); |
| * RTFTransfer rtfTransfer = RTFTransfer.getInstance(); |
| * clipboard.setContents(new Object[]{textData, rtfData}, new Transfer[]{textTransfer, rtfTransfer}); |
| * clipboard.dispose(); |
| * </code></pre> |
| * |
| * @param data the data to be set in the clipboard |
| * @param dataTypes the transfer agents that will convert the data to its platform |
| * specific format; each entry in the data array must have a corresponding dataType |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if data is null or datatypes is null |
| * or the length of data is not the same as the length of dataTypes</li> |
| * </ul> |
| * @exception SWTError <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * <li>ERROR_CANNOT_SET_CLIPBOARD - if the clipboard is locked or otherwise unavailable</li> |
| * </ul> |
| */ |
| public void setContents(Object[] data, Transfer[] dataTypes) { |
| checkWidget(); |
| if (data == null || dataTypes == null || data.length != dataTypes.length) { |
| DND.error(SWT.ERROR_INVALID_ARGUMENT); |
| } |
| if (dataTypes.length == 0) return; |
| ClipboardProxy proxy = ClipboardProxy._getInstance(display); |
| if (!proxy.setData(data, dataTypes)) { |
| DND.error(DND.ERROR_CANNOT_SET_CLIPBOARD); |
| } |
| } |
| |
| /** |
| * Returns an array of the data types currently available on the system clipboard. Use |
| * with Transfer.isSupportedType. |
| * |
| * @return array of TransferData |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @see Transfer#isSupportedType |
| * |
| * @since 3.0 |
| */ |
| public TransferData[] getAvailableTypes() { |
| checkWidget(); |
| int[] types = _getAvailableTypes(); |
| TransferData[] result = new TransferData[types.length]; |
| for (int i = 0; i < types.length; i++) { |
| result[i] = new TransferData(); |
| result[i].type = types[i]; |
| } |
| return result; |
| } |
| |
| /** |
| * Returns a platform specific list of the data types currently available on the |
| * system clipboard. |
| * |
| * <p>Note: <code>getAvailableTypeNames</code> is a utility for writing a Transfer |
| * sub-class. It should NOT be used within an application because it provides |
| * platform specific information.</p> |
| * |
| * @return a platform specific list of the data types currently available on the |
| * system clipboard |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| */ |
| public String[] getAvailableTypeNames() { |
| checkWidget(); |
| int[] types = _getAvailableTypes(); |
| String[] result = new String[types.length]; |
| int count = 0; |
| for (int i = 0; i < types.length; i++) { |
| int /*long*/ pName = OS.gdk_atom_name(types[i]); |
| if (pName == 0) { |
| continue; |
| } |
| byte[] buffer = new byte [OS.strlen(pName)]; |
| OS.memmove (buffer, pName, buffer.length); |
| OS.g_free (pName); |
| result[count++] = new String (Converter.mbcsToWcs (null, buffer)); |
| } |
| if (count < types.length){ |
| String[] temp = new String[count]; |
| System.arraycopy(result, 0, temp, 0, count); |
| result = temp; |
| } |
| return result; |
| } |
| |
| private int[] _getAvailableTypes() { |
| int[] types = new int[0]; |
| // first try the primary clipboard |
| int /*long*/ selection_data = gtk_clipboard_wait_for_contents(GTKPRIMARYCLIPBOARD, TARGET); |
| if (selection_data != 0) { |
| try { |
| GtkSelectionData gtkSelectionData = new GtkSelectionData(); |
| OS.memmove(gtkSelectionData, selection_data, GtkSelectionData.sizeof); |
| if (gtkSelectionData.length == 0) return types; |
| types = new int[gtkSelectionData.length * 8 / gtkSelectionData.format]; |
| OS.memmove(types, gtkSelectionData.data, gtkSelectionData.length); |
| } finally { |
| OS.gtk_selection_data_free(selection_data); |
| } |
| } |
| // next try the selection clipboard |
| selection_data = gtk_clipboard_wait_for_contents(GTKCLIPBOARD, TARGET); |
| if (selection_data != 0) { |
| try { |
| GtkSelectionData gtkSelectionData = new GtkSelectionData(); |
| OS.memmove(gtkSelectionData, selection_data, GtkSelectionData.sizeof); |
| if (gtkSelectionData.length == 0) return types; |
| int[] temp = new int[gtkSelectionData.length * 8 / gtkSelectionData.format]; |
| OS.memmove(temp, gtkSelectionData.data, gtkSelectionData.length); |
| int[] newTypes = new int[types.length + temp.length]; |
| System.arraycopy(types, 0, newTypes, 0, types.length); |
| System.arraycopy(temp, 0, newTypes, types.length, temp.length); |
| types = newTypes; |
| } finally { |
| OS.gtk_selection_data_free(selection_data); |
| } |
| } |
| return types; |
| } |
| |
| int /*long*/ gtk_clipboard_wait_for_contents(int /*long*/ clipboard, int /*long*/ target) { |
| display.dispatchEvents = new int[]{OS.GDK_SELECTION_NOTIFY}; |
| int /*long*/ selection_data = OS.gtk_clipboard_wait_for_contents(clipboard, target); |
| display.dispatchEvents = null; |
| return selection_data; |
| } |
| } |