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      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 
     29 #include "WebKitDLL.h"
     30 #include "WebView.h"
     31 
     32 #include <WebCore/Cursor.h>
     33 #include <WebCore/DragActions.h>
     34 #include <WebCore/EventHandler.h>
     35 #include <WebCore/Frame.h>
     36 #include <WebCore/FrameView.h>
     37 #include <WebCore/Page.h>
     38 #include <WebCore/PlatformMouseEvent.h>
     39 #include <wtf/CurrentTime.h>
     40 
     41 #include <Windows.h>
     42 
     43 using namespace WebCore;
     44 
     45 
     46 HRESULT WebDropSource::createInstance(WebView* webView, IDropSource** result)
     47 {
     48     if (!webView || !result)
     49         return E_INVALIDARG;
     50     *result = new WebDropSource(webView);
     51     return S_OK;
     52 }
     53 
     54 WebDropSource::WebDropSource(WebView* webView)
     55 : m_ref(1)
     56 , m_dropped(false)
     57 , m_webView(webView)
     58 {
     59     gClassCount++;
     60     gClassNameCount.add("WebDropSource");
     61 }
     62 
     63 WebDropSource::~WebDropSource()
     64 {
     65     gClassCount--;
     66     gClassNameCount.remove("WebDropSource");
     67 }
     68 
     69 STDMETHODIMP WebDropSource::QueryInterface(REFIID riid, void** ppvObject)
     70 {
     71     *ppvObject = 0;
     72     if (IsEqualIID(riid, IID_IUnknown) ||
     73         IsEqualIID(riid, IID_IDropSource)) {
     74         *ppvObject = this;
     75         AddRef();
     76 
     77         return S_OK;
     78     }
     79 
     80     return E_NOINTERFACE;
     81 }
     82 
     83 STDMETHODIMP_(ULONG) WebDropSource::AddRef(void)
     84 {
     85     return InterlockedIncrement(&m_ref);
     86 }
     87 
     88 STDMETHODIMP_(ULONG) WebDropSource::Release(void)
     89 {
     90     long c = InterlockedDecrement(&m_ref);
     91     if (c == 0)
     92         delete this;
     93     return c;
     94 }
     95 
     96 PlatformMouseEvent generateMouseEvent(WebView* webView, bool isDrag) {
     97     POINTL pt;
     98     ::GetCursorPos((LPPOINT)&pt);
     99     POINTL localpt = pt;
    100     HWND viewWindow;
    101     if (SUCCEEDED(webView->viewWindow((OLE_HANDLE*)&viewWindow)))
    102         ::ScreenToClient(viewWindow, (LPPOINT)&localpt);
    103     return PlatformMouseEvent(IntPoint(localpt.x, localpt.y), IntPoint(pt.x, pt.y),
    104         isDrag ? LeftButton : NoButton, MouseEventMoved, 0, false, false, false, false, currentTime());
    105 }
    106 
    107 STDMETHODIMP WebDropSource::QueryContinueDrag(BOOL fEscapePressed, DWORD grfKeyState)
    108 {
    109     if (fEscapePressed || !(grfKeyState & (MK_LBUTTON|MK_RBUTTON))) {
    110         m_dropped = !fEscapePressed;
    111         return fEscapePressed? DRAGDROP_S_CANCEL : DRAGDROP_S_DROP;
    112     }
    113 
    114     return S_OK;
    115 }
    116 
    117 STDMETHODIMP WebDropSource::GiveFeedback(DWORD dwEffect)
    118 {
    119     BOOL showCustomCursors;
    120     if (FAILED(WebPreferences::sharedStandardPreferences()->customDragCursorsEnabled(&showCustomCursors)))
    121         return DRAGDROP_S_USEDEFAULTCURSORS;
    122 
    123     // If we don't want to hide the stop icon, let Windows select the cursor.
    124     if (!showCustomCursors)
    125         return DRAGDROP_S_USEDEFAULTCURSORS;
    126 
    127     // If we are going to show something other than the not allowed arrow, then let Windows
    128     // show the cursor.
    129     if (dwEffect != DROPEFFECT_NONE)
    130         return DRAGDROP_S_USEDEFAULTCURSORS;
    131 
    132     HWND viewWindow;
    133     if (FAILED(m_webView->viewWindow(reinterpret_cast<OLE_HANDLE*>(&viewWindow))))
    134         return DRAGDROP_S_USEDEFAULTCURSORS;
    135 
    136     RECT webViewRect;
    137     GetWindowRect(viewWindow, &webViewRect);
    138 
    139     POINT cursorPoint;
    140     GetCursorPos(&cursorPoint);
    141 
    142     if (!PtInRect(&webViewRect, cursorPoint)) {
    143         // If our cursor is outside the bounds of the webView, we want to let Windows select the cursor.
    144         return DRAGDROP_S_USEDEFAULTCURSORS;
    145     }
    146 
    147     FrameView* view = m_webView->page()->mainFrame()->view();
    148     if (!view)
    149         return DRAGDROP_S_USEDEFAULTCURSORS;
    150 
    151     // When dragging inside a WebView and the drag is not allowed, don't show the not allowed icon,
    152     // instead, show the pointer cursor.
    153     // FIXME <rdar://7577595>: Custom cursors aren't supported during drag and drop (default to pointer).
    154     view->setCursor(pointerCursor());
    155     return S_OK;
    156 }
    157