dragcontrollermac.mm

来自「linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自Web」· MM 代码 · 共 79 行

/*
 * Copyright (C) 2007 Apple Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#import "config.h"
#import "DragController.h"

#import "DragData.h"
#import "Frame.h"
#import "FrameView.h"
#import "Page.h"

namespace WebCore {

const int DragController::LinkDragBorderInset = -2;

const int DragController::MaxOriginalImageArea = 1500 * 1500;
const int DragController::DragIconRightInset = 7;
const int DragController::DragIconBottomInset = 3;

const float DragController::DragImageAlpha = 0.75f;

bool DragController::isCopyKeyDown()
{
    return [[NSApp currentEvent] modifierFlags] & NSAlternateKeyMask;
}
    
DragOperation DragController::dragOperation(DragData* dragData)
{
    ASSERT(dragData);
    if ([NSApp modalWindow] || !dragData->containsURL())
        return DragOperationNone;
    
    if (!m_document || ![[m_page->mainFrame()->view()->getOuterView() window] attachedSheet] 
        && [dragData->platformData() draggingSource] != m_page->mainFrame()->view()->getOuterView())
        return DragOperationCopy;
        
    return DragOperationNone;
} 

const IntSize& DragController::maxDragImageSize()
{
    static const IntSize maxDragImageSize(400, 400);
    
    return maxDragImageSize;
}

void DragController::cleanupAfterSystemDrag()
{
    // Drag has ended, dragEnded *should* have been called, however it is possible
    // for the UIDelegate to take over the drag, and fail to send the appropriate
    // drag termination event.  As dragEnded just resets drag variables, we just
    // call it anyway to be on the safe side
    dragEnded();
}

}