1 /*

     2  * Copyright (C) 2007 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 "WebDropSource.h"

    28 #include "WebView.h"

    29 

    30 #include <WebCore/DragActions.h>

    31 #include <WebCore/EventHandler.h>

    32 #include <WebCore/Frame.h>

    33 #include <WebCore/Page.h>

    34 #include <WebCore/PlatformMouseEvent.h>

    35 #include <WebCore/SystemTime.h>

    36 

    37 #include <Windows.h>

    38 

    39 using namespace WebCore;

    40 

    41 

    42 HRESULT WebDropSource::createInstance(WebView* webView, IDropSource** result)

    43 {

    44     if (!webView || !result)

    45         return E_INVALIDARG;

    46     *result = new WebDropSource(webView);

    47     return S_OK;

    48 }

    49 

    50 WebDropSource::WebDropSource(WebView* webView)

    51 : m_ref(1)

    52 , m_dropped(false) 

    53 , m_webView(webView)

    54 {

    55 

    56 }

    57 

    58 STDMETHODIMP WebDropSource::QueryInterface(REFIID riid, void** ppvObject)

    59 {

    60     *ppvObject = 0;

    61     if (IsEqualIID(riid, IID_IUnknown) || 

    62         IsEqualIID(riid, IID_IDropSource)) {

    63         *ppvObject = this;

    64         AddRef();

    65 

    66         return S_OK;

    67     }

    68 

    69     return E_NOINTERFACE;

    70 }

    71 

    72 STDMETHODIMP_(ULONG) WebDropSource::AddRef(void)

    73 {

    74     return InterlockedIncrement(&m_ref);

    75 }

    76 

    77 STDMETHODIMP_(ULONG) WebDropSource::Release(void)

    78 {

    79     long c = InterlockedDecrement(&m_ref);

    80     if (c == 0)

    81         delete this;

    82     return c;

    83 }

    84 

    85 PlatformMouseEvent generateMouseEvent(WebView* webView, bool isDrag) {

    86     POINTL pt;

    87     ::GetCursorPos((LPPOINT)&pt);

    88     POINTL localpt = pt;

    89     HWND viewWindow;

    90     if (SUCCEEDED(webView->viewWindow((OLE_HANDLE*)&viewWindow)))

    91         ::ScreenToClient(viewWindow, (LPPOINT)&localpt);

    92     return PlatformMouseEvent(IntPoint(localpt.x, localpt.y), IntPoint(pt.x, pt.y),

    93         isDrag ? LeftButton : NoButton, MouseEventMoved, 0, false, false, false, false, currentTime());

    94 }

    95 

    96 STDMETHODIMP WebDropSource::QueryContinueDrag(BOOL fEscapePressed, DWORD grfKeyState)

    97 {

    98     if(fEscapePressed)

    99         return DRAGDROP_S_CANCEL;

   100 

   101     if(!(grfKeyState & (MK_LBUTTON|MK_RBUTTON))) {

   102         m_dropped = true;

   103         if (Page* page = m_webView->page())

   104             if (Frame* frame = page->mainFrame()) 

   105                 //FIXME: We need to figure out how to find out what actually happened in the drag <rdar://problem/5015961>

   106                 frame->eventHandler()->dragSourceEndedAt(generateMouseEvent(m_webView.get(), false), DragOperationCopy);

   107         return DRAGDROP_S_DROP;

   108     } else if (Page* page = m_webView->page())

   109         if (Frame* frame = page->mainFrame()) 

   110             frame->eventHandler()->dragSourceMovedTo(generateMouseEvent(m_webView.get(), true));

   111 

   112     return S_OK;

   113 

   114 }

   115 

   116 STDMETHODIMP WebDropSource::GiveFeedback(DWORD)

   117 {

   118     return DRAGDROP_S_USEDEFAULTCURSORS;

   119 }