webhtmlview.mm

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WebKit

/*
 * Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 *           (C) 2006, 2007 Graham Dennis ([e-mail])
 *
 * 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. 
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "WebHTMLView.h"

#import "DOMNodeInternal.h"
#import "DOMRangeInternal.h"
#import "WebArchive.h"
#import "WebNetscapePluginView.h"
#import "WebClipView.h"
#import "WebDOMOperationsPrivate.h"
#import "WebDataSourceInternal.h"
#import "WebDefaultUIDelegate.h"
#import "WebDocumentInternal.h"
#import "WebDynamicScrollBarsView.h"
#import "WebEditingDelegate.h"
#import "WebElementDictionary.h"
#import "WebFrameInternal.h"
#import "WebFramePrivate.h"
#import "WebFrameViewInternal.h"
#import "WebHTMLRepresentationPrivate.h"
#import "WebHTMLViewInternal.h"
#import "WebKitLogging.h"
#import "WebKitNSStringExtras.h"
#import "WebKitVersionChecks.h"
#import "WebLocalizableStrings.h"
#import "WebNodeHighlight.h"
#import "WebNSAttributedStringExtras.h"
#import "WebNSEventExtras.h"
#import "WebNSFileManagerExtras.h"
#import "WebNSImageExtras.h"
#import "WebNSObjectExtras.h"
#import "WebNSPasteboardExtras.h"
#import "WebNSPrintOperationExtras.h"
#import "WebNSURLExtras.h"
#import "WebNSViewExtras.h"
#import "WebPluginController.h"
#import "WebPreferences.h"
#import "WebPreferencesPrivate.h"
#import "WebResourcePrivate.h"
#import "WebStringTruncator.h"
#import "WebTypesInternal.h"
#import "WebUIDelegatePrivate.h"
#import "WebViewInternal.h"
#import <AppKit/NSAccessibility.h>
#import <ApplicationServices/ApplicationServices.h>
#import <dlfcn.h>
#import <WebCore/CachedImage.h>
#import <WebCore/CachedResourceClient.h>
#import <WebCore/ColorMac.h>
#import <WebCore/ContextMenu.h>
#import <WebCore/ContextMenuController.h>
#import <WebCore/Document.h>
#import <WebCore/DocumentFragment.h>
#import <WebCore/Editor.h>
#import <WebCore/EditorDeleteAction.h>
#import <WebCore/Element.h>
#import <WebCore/EventHandler.h>
#import <WebCore/ExceptionHandlers.h>
#import <WebCore/DragController.h>
#import <WebCore/FloatRect.h>
#import <WebCore/FocusController.h>
#import <WebCore/Frame.h>
#import <WebCore/FrameLoader.h>
#import <WebCore/FrameView.h>
#import <WebCore/HitTestResult.h>
#import <WebCore/HTMLNames.h>
#import <WebCore/Image.h>
#import <WebCore/KeyboardEvent.h>
#import <WebCore/LegacyWebArchive.h>
#import <WebCore/MIMETypeRegistry.h>
#import <WebCore/Page.h>
#import <WebCore/PlatformKeyboardEvent.h>
#import <WebCore/PlatformMouseEvent.h>
#import <WebCore/Range.h>
#import <WebCore/SelectionController.h>
#import <WebCore/SharedBuffer.h>
#import <WebCore/SimpleFontData.h>
#import <WebCore/Text.h>
#import <WebCore/WebCoreObjCExtras.h>
#import <WebCore/WebCoreTextRenderer.h>
#import <WebCore/markup.h>
#import <WebKit/DOM.h>
#import <WebKit/DOMExtensions.h>
#import <WebKit/DOMPrivate.h>
#import <WebKitSystemInterface.h>
#import <limits>
#import <runtime/InitializeThreading.h>

#if USE(ACCELERATED_COMPOSITING)
#import <QuartzCore/QuartzCore.h>
#endif

using namespace WebCore;
using namespace HTMLNames;
using namespace WTF;

@interface NSWindow (BorderViewAccess)
- (NSView*)_web_borderView;
@end

@implementation NSWindow (BorderViewAccess)
- (NSView*)_web_borderView
{
    return _borderView;
}
@end

static IMP oldSetCursorIMP = NULL;

#ifdef BUILDING_ON_TIGER
static IMP oldResetCursorRectsIMP = NULL;
static BOOL canSetCursor = YES;

static void resetCursorRects(NSWindow* self, SEL cmd)
{
    NSPoint point = [self mouseLocationOutsideOfEventStream];
    NSView* view = [[self _web_borderView] hitTest:point];
    if ([view isKindOfClass:[WebHTMLView class]]) {
        WebHTMLView *htmlView = (WebHTMLView*)view;
        NSPoint localPoint = [htmlView convertPoint:point fromView:nil];
        NSDictionary *dict = [htmlView elementAtPoint:localPoint allowShadowContent:NO];
        DOMElement *element = [dict objectForKey:WebElementDOMNodeKey];
        if (![element isKindOfClass:[DOMHTMLAppletElement class]] && ![element isKindOfClass:[DOMHTMLObjectElement class]] &&
            ![element isKindOfClass:[DOMHTMLEmbedElement class]])
            canSetCursor = NO;
    }
    oldResetCursorRectsIMP(self, cmd);
    canSetCursor = YES;
}

static void setCursor(NSCursor* self, SEL cmd)
{
    if (canSetCursor)
        oldSetCursorIMP(self, cmd);
}
#else
static void setCursor(NSWindow* self, SEL cmd, NSPoint point)
{
    NSView* view = [[self _web_borderView] hitTest:point];
    if ([view isKindOfClass:[WebHTMLView class]]) {
        WebHTMLView *htmlView = (WebHTMLView*)view;
        NSPoint localPoint = [htmlView convertPoint:point fromView:nil];
        NSDictionary *dict = [htmlView elementAtPoint:localPoint allowShadowContent:NO];
        DOMElement *element = [dict objectForKey:WebElementDOMNodeKey];
        if (![element isKindOfClass:[DOMHTMLAppletElement class]] && ![element isKindOfClass:[DOMHTMLObjectElement class]] &&
            ![element isKindOfClass:[DOMHTMLEmbedElement class]])
            return;
    }
    oldSetCursorIMP(self, cmd, point);
}
#endif

#if USE(ACCELERATED_COMPOSITING)
@interface WebLayerHostingView : NSView
@end

@implementation WebLayerHostingView
// Empty NSViews intercept rightMouseDown: to do context menu handling, but we need the WebLayerHostingView to
// let right mouse clicks through.
- (void)rightMouseDown:(NSEvent *)theEvent
{
    [[self nextResponder] performSelector:_cmd withObject:theEvent];
}
@end
#endif // USE(ACCELERATED_COMPOSITING)

extern "C" {

// Need to declare these attribute names because AppKit exports them but does not make them available in API or SPI headers.

extern NSString *NSMarkedClauseSegmentAttributeName;
extern NSString *NSTextInputReplacementRangeAttributeName;
}

@interface NSView (WebNSViewDetails)
- (void)_recursiveDisplayRectIfNeededIgnoringOpacity:(NSRect)rect isVisibleRect:(BOOL)isVisibleRect rectIsVisibleRectForView:(NSView *)visibleView topView:(BOOL)topView;
- (void)_recursiveDisplayAllDirtyWithLockFocus:(BOOL)needsLockFocus visRect:(NSRect)visRect;
- (void)_recursive:(BOOL)recurse displayRectIgnoringOpacity:(NSRect)displayRect inContext:(NSGraphicsContext *)context topView:(BOOL)topView;
- (NSRect)_dirtyRect;
- (void)_setDrawsOwnDescendants:(BOOL)drawsOwnDescendants;
- (void)_propagateDirtyRectsToOpaqueAncestors;
- (void)_windowChangedKeyState;
@end

@interface NSApplication (WebNSApplicationDetails)
- (void)speakString:(NSString *)string;
@end

@interface NSWindow (WebNSWindowDetails)
- (id)_newFirstResponderAfterResigning;
- (void)_setForceActiveControls:(BOOL)flag;
@end

@interface NSAttributedString (WebNSAttributedStringDetails)
- (id)_initWithDOMRange:(DOMRange *)range;
- (DOMDocumentFragment *)_documentFromRange:(NSRange)range document:(DOMDocument *)document documentAttributes:(NSDictionary *)dict subresources:(NSArray **)subresources;
@end

@interface NSSpellChecker (WebNSSpellCheckerDetails)
- (void)learnWord:(NSString *)word;
@end

// By imaging to a width a little wider than the available pixels,
// thin pages will be scaled down a little, matching the way they
// print in IE and Camino. This lets them use fewer sheets than they
// would otherwise, which is presumably why other browsers do this.
// Wide pages will be scaled down more than this.
#define PrintingMinimumShrinkFactor     1.25f

// This number determines how small we are willing to reduce the page content
// in order to accommodate the widest line. If the page would have to be
// reduced smaller to make the widest line fit, we just clip instead (this
// behavior matches MacIE and Mozilla, at least)
#define PrintingMaximumShrinkFactor     2.0f

// This number determines how short the last printed page of a multi-page print session
// can be before we try to shrink the scale in order to reduce the number of pages, and
// thus eliminate the orphan.
#define LastPrintedPageOrphanRatio      0.1f

// This number determines the amount the scale factor is adjusted to try to eliminate orphans.
// It has no direct mathematical relationship to LastPrintedPageOrphanRatio, due to variable
// numbers of pages, logic to avoid breaking elements, and CSS-supplied hard page breaks.
#define PrintingOrphanShrinkAdjustment  1.1f

#define AUTOSCROLL_INTERVAL             0.1f

#define DRAG_LABEL_BORDER_X             4.0f
//Keep border_y in synch with DragController::LinkDragBorderInset
#define DRAG_LABEL_BORDER_Y             2.0f
#define DRAG_LABEL_RADIUS               5.0f
#define DRAG_LABEL_BORDER_Y_OFFSET              2.0f

#define MIN_DRAG_LABEL_WIDTH_BEFORE_CLIP        120.0f
#define MAX_DRAG_LABEL_WIDTH                    320.0f

#define DRAG_LINK_LABEL_FONT_SIZE   11.0f
#define DRAG_LINK_URL_FONT_SIZE   10.0f

// Any non-zero value will do, but using something recognizable might help us debug some day.
#define TRACKING_RECT_TAG 0xBADFACE

// FIXME: This constant is copied from AppKit's _NXSmartPaste constant.
#define WebSmartPastePboardType @"NeXT smart paste pasteboard type"

#define STANDARD_WEIGHT 5
#define MIN_BOLD_WEIGHT 7
#define STANDARD_BOLD_WEIGHT 9

// Fake URL scheme.
#define WebDataProtocolScheme @"webkit-fake-url"

// <rdar://problem/4985524> References to WebCoreScrollView as a subview of a WebHTMLView may be present
// in some NIB files, so NSUnarchiver must be still able to look up this now-unused class.
@interface WebCoreScrollView : NSScrollView
@end

@implementation WebCoreScrollView
@end

// if YES, do the standard NSView hit test (which can't give the right result when HTML overlaps a view)
static BOOL forceNSViewHitTest;

// if YES, do the "top WebHTMLView" hit test (which we'd like to do all the time but can't because of Java requirements [see bug 4349721])
static BOOL forceWebHTMLViewHitTest;

static WebHTMLView *lastHitView;

// We need this to be able to safely reference the CachedImage for the promised drag data
static CachedResourceClient* promisedDataClient()
{
    static CachedResourceClient* staticCachedResourceClient = new CachedResourceClient;
    return staticCachedResourceClient;
}

@interface WebHTMLView (WebHTMLViewFileInternal)
- (BOOL)_imageExistsAtPaths:(NSArray *)paths;
- (DOMDocumentFragment *)_documentFragmentFromPasteboard:(NSPasteboard *)pasteboard inContext:(DOMRange *)context allowPlainText:(BOOL)allowPlainText;
- (NSString *)_plainTextFromPasteboard:(NSPasteboard *)pasteboard;
- (void)_pasteWithPasteboard:(NSPasteboard *)pasteboard allowPlainText:(BOOL)allowPlainText;
- (void)_pasteAsPlainTextWithPasteboard:(NSPasteboard *)pasteboard;
- (void)_removeMouseMovedObserverUnconditionally;
- (void)_removeSuperviewObservers;
- (void)_removeWindowObservers;
- (BOOL)_shouldInsertFragment:(DOMDocumentFragment *)fragment replacingDOMRange:(DOMRange *)range givenAction:(WebViewInsertAction)action;
- (BOOL)_shouldInsertText:(NSString *)text replacingDOMRange:(DOMRange *)range givenAction:(WebViewInsertAction)action;
- (BOOL)_shouldReplaceSelectionWithText:(NSString *)text givenAction:(WebViewInsertAction)action;
- (float)_calculatePrintHeight;
- (DOMRange *)_selectedRange;
- (BOOL)_shouldDeleteRange:(DOMRange *)range;
- (NSView *)_hitViewForEvent:(NSEvent *)event;
- (void)_writeSelectionWithPasteboardTypes:(NSArray *)types toPasteboard:(NSPasteboard *)pasteboard cachedAttributedString:(NSAttributedString *)attributedString;
- (DOMRange *)_documentRange;
- (void)_setMouseDownEvent:(NSEvent *)event;
- (WebHTMLView *)_topHTMLView;
- (BOOL)_isTopHTMLView;
- (void)_web_setPrintingModeRecursive;
- (void)_web_setPrintingModeRecursiveAndAdjustViewSize;
- (void)_web_clearPrintingModeRecursive;
@end

@interface WebHTMLView (WebForwardDeclaration) // FIXME: Put this in a normal category and stop doing the forward declaration trick.
- (void)_setPrinting:(BOOL)printing minimumPageWidth:(float)minPageWidth maximumPageWidth:(float)maxPageWidth adjustViewSize:(BOOL)adjustViewSize;
@end

@class NSTextInputContext;
@interface NSResponder (AppKitDetails)
- (NSTextInputContext *)inputContext;
@end

@interface NSObject (NSTextInputContextDetails)
- (BOOL)wantsToHandleMouseEvents;
- (BOOL)handleMouseEvent:(NSEvent *)event;
@end

@interface WebHTMLView (WebNSTextInputSupport) <NSTextInput>
- (void)_updateSelectionForInputManager;
@end

@interface WebHTMLView (WebEditingStyleSupport)