eventsendingcontroller.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.
 * Copyright (C) 2006 Jonas Witt <[e-mail]>
 * Copyright (C) 2006 Samuel Weinig <[e-mail]>
 * Copyright (C) 2006 Alexey Proskuryakov <[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 "EventSendingController.h"

#import "DumpRenderTree.h"
#import "DumpRenderTreeDraggingInfo.h"

#import <Carbon/Carbon.h>                           // for GetCurrentEventTime()
#import <WebKit/DOMPrivate.h>
#import <WebKit/WebKit.h>
#import <WebKit/WebViewPrivate.h>

extern "C" void _NSNewKillRingSequence();

enum MouseAction {
    MouseDown,
    MouseUp,
    MouseDragged
};

// Match the DOM spec (sadly the DOM spec does not provide an enum)
enum MouseButton {
    LeftMouseButton = 0,
    MiddleMouseButton = 1,
    RightMouseButton = 2,
    NoMouseButton = -1
};

NSPoint lastMousePosition;
NSPoint lastClickPosition;
int lastClickButton = NoMouseButton;
NSArray *webkitDomEventNames;
NSMutableArray *savedMouseEvents; // mouse events sent between mouseDown and mouseUp are stored here, and then executed at once.
BOOL replayingSavedEvents;

@implementation EventSendingController

+ (void)initialize
{
    webkitDomEventNames = [[NSArray alloc] initWithObjects:
        @"abort",
        @"beforecopy",
        @"beforecut",
        @"beforepaste",
        @"blur",
        @"change",
        @"click",
        @"contextmenu",
        @"copy",
        @"cut",
        @"dblclick",
        @"drag",
        @"dragend",
        @"dragenter",
        @"dragleave",
        @"dragover",
        @"dragstart",
        @"drop",
        @"error",
        @"focus",
        @"input",
        @"keydown",
        @"keypress",
        @"keyup",
        @"load",
        @"mousedown",
        @"mousemove",
        @"mouseout",
        @"mouseover",
        @"mouseup",
        @"mousewheel",
        @"beforeunload",
        @"paste",
        @"readystatechange",
        @"reset",
        @"resize", 
        @"scroll", 
        @"search",
        @"select",
        @"selectstart",
        @"submit", 
        @"textInput", 
        @"textzoomin",
        @"textzoomout",
        @"unload",
        @"zoom",
        nil];
}

+ (BOOL)isSelectorExcludedFromWebScript:(SEL)aSelector
{
    if (aSelector == @selector(mouseDown:)
            || aSelector == @selector(mouseUp:)
            || aSelector == @selector(contextClick)
            || aSelector == @selector(scheduleAsynchronousClick)
            || aSelector == @selector(mouseMoveToX:Y:)
            || aSelector == @selector(leapForward:)
            || aSelector == @selector(keyDown:withModifiers:)
            || aSelector == @selector(enableDOMUIEventLogging:)
            || aSelector == @selector(fireKeyboardEventsToElement:)
            || aSelector == @selector(clearKillRing)
            || aSelector == @selector(textZoomIn)
            || aSelector == @selector(textZoomOut)
            || aSelector == @selector(zoomPageIn)
            || aSelector == @selector(zoomPageOut))
        return NO;
    return YES;
}

+ (BOOL)isKeyExcludedFromWebScript:(const char*)name
{
    if (strcmp(name, "dragMode") == 0)
        return NO;
    return YES;
}

+ (NSString *)webScriptNameForSelector:(SEL)aSelector
{
    if (aSelector == @selector(mouseDown:))
        return @"mouseDown";
    if (aSelector == @selector(mouseUp:))
        return @"mouseUp";
    if (aSelector == @selector(mouseMoveToX:Y:))
        return @"mouseMoveTo";
    if (aSelector == @selector(leapForward:))
        return @"leapForward";
    if (aSelector == @selector(keyDown:withModifiers:))
        return @"keyDown";
    if (aSelector == @selector(enableDOMUIEventLogging:))
        return @"enableDOMUIEventLogging";
    if (aSelector == @selector(fireKeyboardEventsToElement:))
        return @"fireKeyboardEventsToElement";
    if (aSelector == @selector(setDragMode:))
        return @"setDragMode";
    return nil;
}

- (id)init
{
    self = [super init];
    if (self)
        dragMode = YES;
    return self;
}

- (void)dealloc
{
    [super dealloc];
}

- (double)currentEventTime
{
    return GetCurrentEventTime() + timeOffset;
}

- (void)leapForward:(int)milliseconds
{
    if (dragMode && leftMouseButtonDown && !replayingSavedEvents) {
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[EventSendingController instanceMethodSignatureForSelector:@selector(leapForward:)]];
        [invocation setTarget:self];
        [invocation setSelector:@selector(leapForward:)];
        [invocation setArgument:&milliseconds atIndex:2];
        
        [EventSendingController saveEvent:invocation];
        
        return;
    }

    timeOffset += milliseconds / 1000.0;
}

- (void)clearKillRing
{
    _NSNewKillRingSequence();
}

static NSEventType eventTypeForMouseButtonAndAction(int button, MouseAction action)
{
    switch (button) {
        case LeftMouseButton:
            switch (action) {
                case MouseDown:
                    return NSLeftMouseDown;
                case MouseUp:
                    return NSLeftMouseUp;
                case MouseDragged:
                    return NSLeftMouseDragged;
            }
        case RightMouseButton:
            switch (action) {
                case MouseDown:
                    return NSRightMouseDown;
                case MouseUp:
                    return NSRightMouseUp;
                case MouseDragged:
                    return NSRightMouseDragged;
            }
        default:
            switch (action) {
                case MouseDown:
                    return NSOtherMouseDown;
                case MouseUp:
                    return NSOtherMouseUp;
                case MouseDragged:
                    return NSOtherMouseDragged;
            }
    }
    assert(0);
    return static_cast<NSEventType>(0);
}

- (void)updateClickCountForButton:(int)buttonNumber
{
    if (([self currentEventTime] - lastClick >= 1) ||
        !NSEqualPoints(lastMousePosition, lastClickPosition) ||
        lastClickButton != buttonNumber) {
        clickCount = 1;
        lastClickButton = buttonNumber;
    } else
        clickCount++;
}

- (void)mouseDown:(int)buttonNumber
{
    [[[mainFrame frameView] documentView] layout];
    [self updateClickCountForButton:buttonNumber];
    
    NSEventType eventType = eventTypeForMouseButtonAndAction(buttonNumber, MouseDown);
    NSEvent *event = [NSEvent mouseEventWithType:eventType
                                        location:lastMousePosition 
                                   modifierFlags:0 
                                       timestamp:[self currentEventTime]
                                    windowNumber:[[[mainFrame webView] window] windowNumber] 
                                         context:[NSGraphicsContext currentContext] 
                                     eventNumber:++eventNumber 
                                      clickCount:clickCount 
                                        pressure:0.0];

    NSView *subView = [[mainFrame webView] hitTest:[event locationInWindow]];
    if (subView) {
        [subView mouseDown:event];
        if (buttonNumber == LeftMouseButton)
            leftMouseButtonDown = YES;
    }
}

- (void)textZoomIn
{
    [[mainFrame webView] makeTextLarger:self];
}

- (void)textZoomOut
{
    [[mainFrame webView] makeTextSmaller:self];
}

- (void)zoomPageIn
{
    [[mainFrame webView] zoomPageIn:self];
}

- (void)zoomPageOut
{
    [[mainFrame webView] zoomPageOut:self];
}

- (void)mouseUp:(int)buttonNumber
{
    if (dragMode && !replayingSavedEvents) {
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[EventSendingController instanceMethodSignatureForSelector:@selector(mouseUp:)]];
        [invocation setTarget:self];
        [invocation setSelector:@selector(mouseUp:)];
        [invocation setArgument:&buttonNumber atIndex:2];
        
        [EventSendingController saveEvent:invocation];
        [EventSendingController replaySavedEvents];

        return;
    }

    [[[mainFrame frameView] documentView] layout];
    NSEventType eventType = eventTypeForMouseButtonAndAction(buttonNumber, MouseUp);
    NSEvent *event = [NSEvent mouseEventWithType:eventType
                                        location:lastMousePosition 
                                   modifierFlags:0 
                                       timestamp:[self currentEventTime]
                                    windowNumber:[[[mainFrame webView] window] windowNumber] 
                                         context:[NSGraphicsContext currentContext] 
                                     eventNumber:++eventNumber 
                                      clickCount:clickCount 
                                        pressure:0.0];

    NSView *targetView = [[mainFrame webView] hitTest:[event locationInWindow]];
    // FIXME: Silly hack to teach DRT to respect capturing mouse events outside the WebView.
    // The right solution is just to use NSApplication's built-in event sending methods, 
    // instead of rolling our own algorithm for selecting an event target.
    targetView = targetView ? targetView : [[mainFrame frameView] documentView];
    assert(targetView);
    [targetView mouseUp:event];
    if (buttonNumber == LeftMouseButton)
        leftMouseButtonDown = NO;
    lastClick = [event timestamp];
    lastClickPosition = lastMousePosition;
    if (draggingInfo) {
        WebView *webView = [mainFrame webView];
        
        NSDragOperation dragOperation = [webView draggingUpdated:draggingInfo];
        
        if (dragOperation != NSDragOperationNone)