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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 #import "config.h"
     27 #import "DragController.h"
     28 
     29 #if ENABLE(DRAG_SUPPORT)
     30 #import "DragData.h"
     31 #import "Frame.h"
     32 #import "FrameView.h"
     33 #import "Page.h"
     34 
     35 namespace WebCore {
     36 
     37 const int DragController::LinkDragBorderInset = -2;
     38 
     39 const int DragController::MaxOriginalImageArea = 1500 * 1500;
     40 const int DragController::DragIconRightInset = 7;
     41 const int DragController::DragIconBottomInset = 3;
     42 
     43 const float DragController::DragImageAlpha = 0.75f;
     44 
     45 #if ENABLE(EXPERIMENTAL_SINGLE_VIEW_MODE)
     46 
     47 DragOperation DragController::dragOperation(DragData*)
     48 {
     49     return DragOperationNone;
     50 }
     51 
     52 bool DragController::isCopyKeyDown()
     53 {
     54     return false;
     55 }
     56 
     57 #else
     58 
     59 bool DragController::isCopyKeyDown()
     60 {
     61     return [[NSApp currentEvent] modifierFlags] & NSAlternateKeyMask;
     62 }
     63 
     64 DragOperation DragController::dragOperation(DragData* dragData)
     65 {
     66     ASSERT(dragData);
     67     if ([NSApp modalWindow] || !dragData->containsURL())
     68         return DragOperationNone;
     69 
     70     if (!m_documentUnderMouse || ![[m_page->mainFrame()->view()->getOuterView() window] attachedSheet]
     71         && [dragData->platformData() draggingSource] != m_page->mainFrame()->view()->getOuterView())
     72         return DragOperationCopy;
     73 
     74     return DragOperationNone;
     75 }
     76 
     77 #endif
     78 
     79 const IntSize& DragController::maxDragImageSize()
     80 {
     81     static const IntSize maxDragImageSize(400, 400);
     82 
     83     return maxDragImageSize;
     84 }
     85 
     86 void DragController::cleanupAfterSystemDrag()
     87 {
     88     // Drag has ended, dragEnded *should* have been called, however it is possible
     89     // for the UIDelegate to take over the drag, and fail to send the appropriate
     90     // drag termination event.  As dragEnded just resets drag variables, we just
     91     // call it anyway to be on the safe side
     92     dragEnded();
     93 }
     94 
     95 } // namespace WebCore
     96 
     97 #endif // ENABLE(DRAG_SUPPORT)
     98