1 /*

     2  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions

     6  * are met:

     7  * 1. Redistributions of source code must retain the above copyright

     8  *    notice, this list of conditions and the following disclaimer.

     9  * 2. Redistributions in binary form must reproduce the above copyright

    10  *    notice, this list of conditions and the following disclaimer in the

    11  *    documentation and/or other materials provided with the distribution.

    12  *

    13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

    14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

    17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

    21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

    24  */

    25 

    26 #include "config.h"

    27 #include "Clipboard.h"

    28 

    29 #include "CachedImage.h"

    30 #include "Frame.h"

    31 #include "FrameLoader.h"

    32 #include "Image.h"

    33 

    34 namespace WebCore {

    35 

    36 Clipboard::Clipboard(ClipboardAccessPolicy policy, bool isForDragging) 

    37     : m_policy(policy)

    38     , m_dropEffect("uninitialized")

    39     , m_effectAllowed("uninitialized")

    40     , m_dragStarted(false)

    41     , m_forDragging(isForDragging)

    42     , m_dragImage(0)

    43 {

    44 }

    45     

    46 void Clipboard::setAccessPolicy(ClipboardAccessPolicy policy)

    47 {

    48     // once you go numb, can never go back

    49     ASSERT(m_policy != ClipboardNumb || policy == ClipboardNumb);

    50     m_policy = policy;

    51 }

    52 

    53 // These "conversion" methods are called by both WebCore and WebKit, and never make sense to JS, so we don't

    54 // worry about security for these. They don't allow access to the pasteboard anyway.

    55 

    56 static DragOperation dragOpFromIEOp(const String& op)

    57 {

    58     // yep, it's really just this fixed set

    59     if (op == "uninitialized")

    60         return DragOperationEvery;

    61     if (op == "none")

    62         return DragOperationNone;

    63     if (op == "copy")

    64         return DragOperationCopy;

    65     if (op == "link")

    66         return DragOperationLink;

    67     if (op == "move")

    68         return (DragOperation)(DragOperationGeneric | DragOperationMove);

    69     if (op == "copyLink")

    70         return (DragOperation)(DragOperationCopy | DragOperationLink);

    71     if (op == "copyMove")

    72         return (DragOperation)(DragOperationCopy | DragOperationGeneric | DragOperationMove);

    73     if (op == "linkMove")

    74         return (DragOperation)(DragOperationLink | DragOperationGeneric | DragOperationMove);

    75     if (op == "all")

    76         return DragOperationEvery;

    77     return DragOperationPrivate;  // really a marker for "no conversion"

    78 }

    79 

    80 static String IEOpFromDragOp(DragOperation op)

    81 {

    82     bool moveSet = !!((DragOperationGeneric | DragOperationMove) & op);

    83     

    84     if ((moveSet && (op & DragOperationCopy) && (op & DragOperationLink))

    85         || (op == DragOperationEvery))

    86         return "all";

    87     if (moveSet && (op & DragOperationCopy))

    88         return "copyMove";

    89     if (moveSet && (op & DragOperationLink))

    90         return "linkMove";

    91     if ((op & DragOperationCopy) && (op & DragOperationLink))

    92         return "copyLink";

    93     if (moveSet)

    94         return "move";

    95     if (op & DragOperationCopy)

    96         return "copy";

    97     if (op & DragOperationLink)

    98         return "link";

    99     return "none";

   100 }

   101 

   102 DragOperation Clipboard::sourceOperation() const

   103 {

   104     DragOperation op = dragOpFromIEOp(m_effectAllowed);

   105     ASSERT(op != DragOperationPrivate);

   106     return op;

   107 }

   108 

   109 DragOperation Clipboard::destinationOperation() const

   110 {

   111     DragOperation op = dragOpFromIEOp(m_dropEffect);

   112     ASSERT(op == DragOperationCopy || op == DragOperationNone || op == DragOperationLink || op == (DragOperation)(DragOperationGeneric | DragOperationMove) || op == DragOperationEvery);

   113     return op;

   114 }

   115 

   116 void Clipboard::setSourceOperation(DragOperation op)

   117 {

   118     ASSERT_ARG(op, op != DragOperationPrivate);

   119     m_effectAllowed = IEOpFromDragOp(op);

   120 }

   121 

   122 void Clipboard::setDestinationOperation(DragOperation op)

   123 {

   124     ASSERT_ARG(op, op == DragOperationCopy || op == DragOperationNone || op == DragOperationLink || op == DragOperationGeneric || op == DragOperationMove || op == (DragOperation)(DragOperationGeneric | DragOperationMove));

   125     m_dropEffect = IEOpFromDragOp(op);

   126 }

   127 

   128 void Clipboard::setDropEffect(const String &effect)

   129 {

   130     if (!m_forDragging)

   131         return;

   132 

   133     // The attribute must ignore any attempts to set it to a value other than none, copy, link, and move. 

   134     if (effect != "none" && effect != "copy"  && effect != "link" && effect != "move")

   135         return;

   136 

   137     if (m_policy == ClipboardReadable || m_policy == ClipboardTypesReadable)

   138         m_dropEffect = effect;

   139 }

   140 

   141 void Clipboard::setEffectAllowed(const String &effect)

   142 {

   143     if (!m_forDragging)

   144         return;

   145 

   146     if (dragOpFromIEOp(effect) == DragOperationPrivate) {

   147         // This means that there was no conversion, and the effectAllowed that

   148         // we are passed isn't a valid effectAllowed, so we should ignore it,

   149         // and not set m_effectAllowed.

   150 

   151         // The attribute must ignore any attempts to set it to a value other than 

   152         // none, copy, copyLink, copyMove, link, linkMove, move, all, and uninitialized.

   153         return;

   154     }

   155 

   156 

   157     if (m_policy == ClipboardWritable)

   158         m_effectAllowed = effect;

   159 }

   160 

   161 } // namespace WebCore