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      1 /*
      2  * Copyright (C) 2009 Google 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef WebDragData_h
     32 #define WebDragData_h
     33 
     34 #include "WebCommon.h"
     35 #include "WebData.h"
     36 #include "WebString.h"
     37 #include "WebURL.h"
     38 
     39 #if BLINK_IMPLEMENTATION
     40 namespace WebCore { class ChromiumDataObject; }
     41 namespace WTF { template <typename T> class PassRefPtr; }
     42 #endif
     43 
     44 namespace blink {
     45 
     46 class WebDragDataPrivate;
     47 template <typename T> class WebVector;
     48 
     49 // Holds data that may be exchanged through a drag-n-drop operation. It is
     50 // inexpensive to copy a WebDragData object.
     51 class WebDragData {
     52 public:
     53     struct Item {
     54         enum StorageType {
     55             // String data with an associated MIME type. Depending on the MIME type, there may be
     56             // optional metadata attributes as well.
     57             StorageTypeString,
     58             // Stores the name of one file being dragged into the renderer.
     59             StorageTypeFilename,
     60             // An image being dragged out of the renderer. Contains a buffer holding the image data
     61             // as well as the suggested name for saving the image to.
     62             StorageTypeBinaryData,
     63         };
     64 
     65         StorageType storageType;
     66 
     67         // Only valid when storageType == StorageTypeString.
     68         WebString stringType;
     69         WebString stringData;
     70 
     71         // Only valid when storageType == StorageTypeFilename.
     72         WebString filenameData;
     73         WebString displayNameData;
     74 
     75         // Only valid when storageType == StorageTypeBinaryData.
     76         WebData binaryData;
     77 
     78         // Title associated with a link when stringType == "text/uri-list".
     79         // Filename when storageType == StorageTypeBinaryData.
     80         WebString title;
     81 
     82         // Only valid when stringType == "text/html".
     83         WebURL baseURL;
     84     };
     85 
     86     ~WebDragData() { reset(); }
     87 
     88     WebDragData() : m_private(0) { }
     89     WebDragData(const WebDragData& d) : m_private(0) { assign(d); }
     90     WebDragData& operator=(const WebDragData& d)
     91     {
     92         assign(d);
     93         return *this;
     94     }
     95 
     96     BLINK_EXPORT void initialize();
     97     BLINK_EXPORT void reset();
     98     BLINK_EXPORT void assign(const WebDragData&);
     99 
    100     bool isNull() const { return !m_private; }
    101 
    102     BLINK_EXPORT WebVector<Item> items() const;
    103     BLINK_EXPORT void setItems(const WebVector<Item>&);
    104     BLINK_EXPORT void addItem(const Item&);
    105 
    106     BLINK_EXPORT WebString filesystemId() const;
    107     BLINK_EXPORT void setFilesystemId(const WebString&);
    108 
    109 #if BLINK_IMPLEMENTATION
    110     WebDragData(const WTF::PassRefPtr<WebCore::ChromiumDataObject>&);
    111     WebDragData& operator=(const WTF::PassRefPtr<WebCore::ChromiumDataObject>&);
    112     operator WTF::PassRefPtr<WebCore::ChromiumDataObject>() const;
    113 #endif
    114 
    115 private:
    116     void assign(WebDragDataPrivate*);
    117     void ensureMutable();
    118     WebDragDataPrivate* m_private;
    119 };
    120 
    121 } // namespace blink
    122 
    123 #endif
    124