/*

 * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.

 * Copyright (C) 2006 David Smith (catfish.man@gmail.com)

 *

 * 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 "WebViewInternal.h"

#import "WebFrameInternal.h"

#import "WebHTMLView.h"

#import "WebTextCompletionController.h"

#import "WebViewData.h"

#import <WebCore/Frame.h>

using namespace WebCore;

@class NSTextInputContext;

@interface NSResponder (WebNSResponderDetails)

- (NSTextInputContext *)inputContext;

@end

#if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD)

@interface NSObject (NSTextInputContextDetails)

- (BOOL)wantsToHandleMouseEvents;

- (BOOL)handleMouseEvent:(NSEvent *)event;

@end

#endif

@implementation WebView (WebViewEventHandling)

static WebView *lastMouseoverView;

- (void)_closingEventHandling

{

    if (lastMouseoverView == self)

        lastMouseoverView = nil;

}

- (void)_setMouseDownEvent:(NSEvent *)event

{

    ASSERT(!event || [event type] == NSLeftMouseDown || [event type] == NSRightMouseDown || [event type] == NSOtherMouseDown);

    if (event == _private->mouseDownEvent)

        return;

    [event retain];

    [_private->mouseDownEvent release];

    _private->mouseDownEvent = event;

}

- (void)mouseDown:(NSEvent *)event

{

    // FIXME (Viewless): This method should be shared with WebHTMLView, which needs to

    // do the same work in the usesDocumentViews case. We don't want to maintain two

    // duplicate copies of this method.

    if (_private->usesDocumentViews) {

        [super mouseDown:event];

        return;

    }

    // There's a chance that responding to this event will run a nested event loop, and

    // fetching a new event might release the old one. Retaining and then autoreleasing

    // the current event prevents that from causing a problem inside WebKit or AppKit code.

    [[event retain] autorelease];

    RetainPtr<WebView> protector = self;

    if ([[self inputContext] wantsToHandleMouseEvents] && [[self inputContext] handleMouseEvent:event])

        return;

    _private->handlingMouseDownEvent = YES;

    // Record the mouse down position so we can determine drag hysteresis.

    [self _setMouseDownEvent:event];

    NSInputManager *currentInputManager = [NSInputManager currentInputManager];

    if ([currentInputManager wantsToHandleMouseEvents] && [currentInputManager handleMouseEvent:event])

        goto done;

    [_private->completionController endRevertingChange:NO moveLeft:NO];

    // If the web page handles the context menu event and menuForEvent: returns nil, we'll get control click events here.

    // We don't want to pass them along to KHTML a second time.

    if (!([event modifierFlags] & NSControlKeyMask)) {

        _private->ignoringMouseDraggedEvents = NO;

        // Don't do any mouseover while the mouse is down.

        [self _cancelUpdateMouseoverTimer];

        // Let WebCore get a chance to deal with the event. This will call back to us

        // to start the autoscroll timer if appropriate.

        if (Frame* frame = [self _mainCoreFrame])

            frame->eventHandler()->mouseDown(event);

    }

done:

    _private->handlingMouseDownEvent = NO;

}

- (void)mouseUp:(NSEvent *)event

{

    // FIXME (Viewless): This method should be shared with WebHTMLView, which needs to

    // do the same work in the usesDocumentViews case. We don't want to maintain two

    // duplicate copies of this method.

    if (_private->usesDocumentViews) {

        [super mouseUp:event];

        return;

    }

    // There's a chance that responding to this event will run a nested event loop, and

    // fetching a new event might release the old one. Retaining and then autoreleasing

    // the current event prevents that from causing a problem inside WebKit or AppKit code.

    [[event retain] autorelease];

    [self _setMouseDownEvent:nil];

    NSInputManager *currentInputManager = [NSInputManager currentInputManager];

    if ([currentInputManager wantsToHandleMouseEvents] && [currentInputManager handleMouseEvent:event])

        return;

    [self retain];

    [self _stopAutoscrollTimer];

    if (Frame* frame = [self _mainCoreFrame])

        frame->eventHandler()->mouseUp(event);

    [self _updateMouseoverWithFakeEvent];

    [self release];

}

+ (void)_updateMouseoverWithEvent:(NSEvent *)event

{

    WebView *oldView = lastMouseoverView;

    lastMouseoverView = nil;

    NSView *contentView = [[event window] contentView];

    NSPoint locationForHitTest = [[contentView superview] convertPoint:[event locationInWindow] fromView:nil];

    for (NSView *hitView = [contentView hitTest:locationForHitTest]; hitView; hitView = [hitView superview]) {

        if ([hitView isKindOfClass:[WebView class]]) {

            lastMouseoverView = static_cast<WebView *>(hitView);

            break;

        }

    }

    if (lastMouseoverView && lastMouseoverView->_private->hoverFeedbackSuspended)

        lastMouseoverView = nil;

    if (lastMouseoverView != oldView) {

        if (Frame* oldCoreFrame = [oldView _mainCoreFrame]) {

            NSEvent *oldViewEvent = [NSEvent mouseEventWithType:NSMouseMoved

                location:NSMakePoint(-1, -1)

                modifierFlags:[[NSApp currentEvent] modifierFlags]

                timestamp:[NSDate timeIntervalSinceReferenceDate]

                windowNumber:[[oldView window] windowNumber]

                context:[[NSApp currentEvent] context]

                eventNumber:0 clickCount:0 pressure:0];

            oldCoreFrame->eventHandler()->mouseMoved(oldViewEvent);

        }

    }

    if (!lastMouseoverView)

        return;

    if (Frame* coreFrame = core([lastMouseoverView mainFrame]))

        coreFrame->eventHandler()->mouseMoved(event);

}

- (void)_updateMouseoverWithFakeEvent

{

    [self _cancelUpdateMouseoverTimer];

    NSEvent *fakeEvent = [NSEvent mouseEventWithType:NSMouseMoved

        location:[[self window] convertScreenToBase:[NSEvent mouseLocation]]

        modifierFlags:[[NSApp currentEvent] modifierFlags]

        timestamp:[NSDate timeIntervalSinceReferenceDate]

        windowNumber:[[self window] windowNumber]

        context:[[NSApp currentEvent] context]

        eventNumber:0 clickCount:0 pressure:0];

    [[self class] _updateMouseoverWithEvent:fakeEvent];

}

- (void)_cancelUpdateMouseoverTimer

{

    if (_private->updateMouseoverTimer) {

        CFRunLoopTimerInvalidate(_private->updateMouseoverTimer);

        CFRelease(_private->updateMouseoverTimer);

        _private->updateMouseoverTimer = NULL;

    }

}

- (void)_stopAutoscrollTimer

{

    NSTimer *timer = _private->autoscrollTimer;

    _private->autoscrollTimer = nil;

    [_private->autoscrollTriggerEvent release];

    _private->autoscrollTriggerEvent = nil;

    [timer invalidate];

    [timer release];

}

- (void)_setToolTip:(NSString *)toolTip

{

    if (_private->usesDocumentViews) {

        id documentView = [[[self _selectedOrMainFrame] frameView] documentView];

        if ([documentView isKindOfClass:[WebHTMLView class]])

            [documentView _setToolTip:toolTip];

        return;

    }

    // FIXME (Viewless): Code to handle tooltips needs to move into WebView.

}

@end