/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the QtGui module of the Qt Toolkit.
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** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
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** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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****************************************************************************/

/****************************************************************************
 NB: This is not a header file, dispite the file name suffix. This file is
 included directly into the source code of qcocoawindow_mac.mm and
 qcocoapanel_mac.mm to avoid manually doing copy and paste of the exact
 same code needed at both places. This solution makes it more difficult
 to e.g fix a bug in qcocoawindow_mac.mm, but forget to do the same in
 qcocoapanel_mac.mm.
 The reason we need to do copy and paste in the first place, rather than
 resolve to method overriding, is that QCocoaPanel needs to inherit from
 NSPanel, while QCocoaWindow needs to inherit NSWindow rather than NSPanel).
****************************************************************************/

QT_BEGIN_NAMESPACE
extern Qt::MouseButton cocoaButton2QtButton(NSInteger buttonNum); // qcocoaview.mm
extern QPointer<QWidget> qt_button_down; //qapplication_mac.cpp
extern const QStringList& qEnabledDraggedTypes(); // qmime_mac.cpp
extern bool qt_blockCocoaSettingModalWindowLevel; // qeventdispatcher_mac_p.h

Q_GLOBAL_STATIC(QPointer<QWidget>, currentDragTarget);

QT_END_NAMESPACE

- (id)initWithContentRect:(NSRect)contentRect
    styleMask:(NSUInteger)windowStyle
    backing:(NSBackingStoreType)bufferingType
    defer:(BOOL)deferCreation
{
    self = [super initWithContentRect:contentRect styleMask:windowStyle
        backing:bufferingType defer:deferCreation];
    if (self) {
        currentCustomDragTypes = 0;
    }
    return self;
}

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

- (BOOL)canBecomeKeyWindow
{
    QWidget *widget = [self QT_MANGLE_NAMESPACE(qt_qwidget)];

    bool isToolTip = (widget->windowType() == Qt::ToolTip);
    bool isPopup = (widget->windowType() == Qt::Popup);
    return !(isPopup || isToolTip);
}

- (BOOL)canBecomeMainWindow
{
    QWidget *widget = [self QT_MANGLE_NAMESPACE(qt_qwidget)];

    bool isToolTip = (widget->windowType() == Qt::ToolTip);
    bool isPopup = (widget->windowType() == Qt::Popup);
    return !(isPopup || isToolTip);
}

- (void)orderWindow:(NSWindowOrderingMode)orderingMode relativeTo:(NSInteger)otherWindowNumber
{
    if (qt_blockCocoaSettingModalWindowLevel) {
        // To avoid windows popping in front while restoring modal sessions
        // in the event dispatcher, we block cocoa from ordering this window
        // to front. The result of not doing this can be seen if executing
        // a native color dialog on top of another executing dialog.
        return;
    }
    [super orderWindow:orderingMode relativeTo:otherWindowNumber];
}

- (void)setLevel:(NSInteger)windowLevel
{
    if (qt_blockCocoaSettingModalWindowLevel) {
        // To avoid windows popping in front while restoring modal sessions
        // in the event dispatcher, we block cocoa from ordering this window
        // to front. The result of not doing this can be seen if executing
        // a native color dialog on top of another executing dialog.
        return;
    }
    [super setLevel:windowLevel];
}

- (void)toggleToolbarShown:(id)sender
{
    macSendToolbarChangeEvent([self QT_MANGLE_NAMESPACE(qt_qwidget)]);
    [super toggleToolbarShown:sender];
}

/*
    The methods keyDown, keyUp, and flagsChanged... These really shouldn't ever
    get hit. We automatically say we can be first responder if we are a window.
    So, the handling should get handled by the view. This is here more as a
    last resort (i.e., this is code that can potentially be removed).
 */
- (void)keyDown:(NSEvent *)theEvent
{
    bool keyOK = qt_dispatchKeyEvent(theEvent, [self QT_MANGLE_NAMESPACE(qt_qwidget)]);
    if (!keyOK)
        [super keyDown:theEvent];
}

- (void)keyUp:(NSEvent *)theEvent
{
    bool keyOK = qt_dispatchKeyEvent(theEvent, [self QT_MANGLE_NAMESPACE(qt_qwidget)]);
    if (!keyOK)
        [super keyUp:theEvent];
}

- (void)flagsChanged:(NSEvent *)theEvent
{
    qt_dispatchModifiersChanged(theEvent, [self QT_MANGLE_NAMESPACE(qt_qwidget)]);
    [super flagsChanged:theEvent];
}


- (void)tabletProximity:(NSEvent *)tabletEvent
{
    qt_dispatchTabletProximityEvent(tabletEvent);
}

- (void)qtDispatcherToQAction:(id)sender
{
    // If this window is modal, the menu bar will be modally shaddowed.
    // In that case, since the window will be in the first responder chain,
    // we can still catch the trigger here and forward it to the menu bar.
    // This is needed as a single modal dialog on Qt should be able to access
    // the application menu (e.g. quit).
    [[NSApp QT_MANGLE_NAMESPACE(qt_qcocoamenuLoader)] qtDispatcherToQAction:sender];
}

- (void)terminate:(id)sender
{
    // This function is called from the quit item in the menubar when this window
    // is in the first responder chain (see also qtDispatcherToQAction above)
    [NSApp terminate:sender];
}

- (void)sendEvent:(NSEvent *)event
{
    QWidget *widget = [[QT_MANGLE_NAMESPACE(QCocoaWindowDelegate) sharedDelegate] qt_qwidgetForWindow:self];

    // Cocoa can hold onto the window after we've disavowed its knowledge. So,
    // if we get sent an event afterwards just have it go through the super's
    // version and don't do any stuff with Qt.
    if (!widget) {
        [super sendEvent:event];
        return;
    }

    [self retain];
    QT_MANGLE_NAMESPACE(QCocoaView) *view = static_cast<QT_MANGLE_NAMESPACE(QCocoaView) *>(qt_mac_nativeview_for(widget));
    Qt::MouseButton mouseButton = cocoaButton2QtButton([event buttonNumber]);

    bool handled = false;
    // sometimes need to redirect mouse events to the popup.
    QWidget *popup = qAppInstance()->activePopupWidget();
    if (popup) {
        switch([event type])
        {
        case NSLeftMouseDown:
            if (!qt_button_down)
                qt_button_down = widget;
            handled = qt_mac_handleMouseEvent(view, event, QEvent::MouseButtonPress, mouseButton);
            // Don't call super here. This prevents us from getting the mouseUp event,
            // which we need to send even if the mouseDown event was not accepted. 
            // (this is standard Qt behavior.)
            break;
        case NSRightMouseDown:
        case NSOtherMouseDown:
            if (!qt_button_down)
                qt_button_down = widget;
            handled = qt_mac_handleMouseEvent(view, event, QEvent::MouseButtonPress, mouseButton);
            break;
        case NSLeftMouseUp:
        case NSRightMouseUp:
        case NSOtherMouseUp:
            handled = qt_mac_handleMouseEvent(view, event, QEvent::MouseButtonRelease, mouseButton);
            qt_button_down = 0;
            break;
        case NSMouseMoved:
            handled = qt_mac_handleMouseEvent(view, event, QEvent::MouseMove, Qt::NoButton);
            break;
        case NSLeftMouseDragged:
        case NSRightMouseDragged:
        case NSOtherMouseDragged:
            [QT_MANGLE_NAMESPACE(QCocoaView) currentMouseEvent]->view = view;
            [QT_MANGLE_NAMESPACE(QCocoaView) currentMouseEvent]->theEvent = event;
            handled = qt_mac_handleMouseEvent(view, event, QEvent::MouseMove, mouseButton);
            break;
        default:
            [super sendEvent:event];
            break;
        }
    } else {
        [super sendEvent:event];
    }

    if (!handled)
        qt_mac_dispatchNCMouseMessage(self, event, [self QT_MANGLE_NAMESPACE(qt_qwidget)], leftButtonIsRightButton);

    [self release];
}

- (BOOL)makeFirstResponder:(NSResponder *)responder
{
    // For some reason Cocoa wants to flip the first responder
    // when Qt doesn't want to, sorry, but "No" :-)
    if (responder == nil && qApp->focusWidget())
        return NO;
    return [super makeFirstResponder:responder];
}

+ (Class)frameViewClassForStyleMask:(NSUInteger)styleMask
{
    if (styleMask & QtMacCustomizeWindow)
        return [QT_MANGLE_NAMESPACE(QCocoaWindowCustomThemeFrame) class];
    return [super frameViewClassForStyleMask:styleMask];
}

-(void)registerDragTypes
{
    // Calling registerForDraggedTypes below is slow, so only do
    // it once for each window, or when the custom types change.
    QMacCocoaAutoReleasePool pool;
    const QStringList& customTypes = qEnabledDraggedTypes();
    if (currentCustomDragTypes == 0 || *currentCustomDragTypes != customTypes) {
        if (currentCustomDragTypes == 0)
            currentCustomDragTypes = new QStringList();
        *currentCustomDragTypes = customTypes;
        const NSString* mimeTypeGeneric = @"com.trolltech.qt.MimeTypeName";
        NSMutableArray *supportedTypes = [NSMutableArray arrayWithObjects:NSColorPboardType,
                       NSFilenamesPboardType, NSStringPboardType,
                       NSFilenamesPboardType, NSPostScriptPboardType, NSTIFFPboardType,
                       NSRTFPboardType, NSTabularTextPboardType, NSFontPboardType,
                       NSRulerPboardType, NSFileContentsPboardType, NSColorPboardType,
                       NSRTFDPboardType, NSHTMLPboardType, NSPICTPboardType,
                       NSURLPboardType, NSPDFPboardType, NSVCardPboardType,
                       NSFilesPromisePboardType, NSInkTextPboardType,
                       NSMultipleTextSelectionPboardType, mimeTypeGeneric, nil];
        // Add custom types supported by the application.
        for (int i = 0; i < customTypes.size(); i++) {
           [supportedTypes addObject:reinterpret_cast<const NSString *>(QCFString::toCFStringRef(customTypes[i]))];
        }
        [self registerForDraggedTypes:supportedTypes];
    }
}

- (QWidget *)dragTargetHitTest:(id <NSDraggingInfo>)sender
{
    // Do a hittest to find the NSView under the
    // mouse, and return the corresponding QWidget:
    NSPoint windowPoint = [sender draggingLocation];
    NSView *candidateView = [[self contentView] hitTest:windowPoint];
    if (![candidateView isKindOfClass:[QT_MANGLE_NAMESPACE(QCocoaView) class]])
        return 0;
    return [static_cast<QT_MANGLE_NAMESPACE(QCocoaView) *>(candidateView) qt_qwidget];
}

- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
{
    // The user dragged something into the window. Send a draggingEntered message
    // to the QWidget under the mouse. As the drag moves over the window, and over
    // different widgets, we will handle enter and leave events from within 
    // draggingUpdated below. The reason why we handle this ourselves rather than
    // subscribing for drag events directly in QCocoaView is that calling 
    // registerForDraggedTypes on the views will severly degrade initialization time
    // for an application that uses a lot of drag subscribing widgets.

    QWidget *target = [self dragTargetHitTest:sender];
    if (!target)
        return [super draggingEntered:sender];
    if (target->testAttribute(Qt::WA_DropSiteRegistered) == false)
        return NSDragOperationNone;

    *currentDragTarget() = target;
    return [reinterpret_cast<NSView *>((*currentDragTarget())->winId()) draggingEntered:sender];
 }

- (NSDragOperation)draggingUpdated:(id < NSDraggingInfo >)sender
{
    QWidget *target = [self dragTargetHitTest:sender];
    if (!target)
        return [super draggingUpdated:sender];

    if (target == *currentDragTarget()) {
        // The drag continues to move over the widget that we have sendt
        // a draggingEntered message to. So just update the view:
        return [reinterpret_cast<NSView *>((*currentDragTarget())->winId()) draggingUpdated:sender];
    } else {
        // The widget under the mouse has changed.
        // So we need to fake enter/leave events:
        if (*currentDragTarget())
            [reinterpret_cast<NSView *>((*currentDragTarget())->winId()) draggingExited:sender];
        if (target->testAttribute(Qt::WA_DropSiteRegistered) == false) {
            *currentDragTarget() = 0;
            return NSDragOperationNone;
        }
        *currentDragTarget() = target;
        return [reinterpret_cast<NSView *>((*currentDragTarget())->winId()) draggingEntered:sender];
    }
}

- (void)draggingExited:(id < NSDraggingInfo >)sender
{
    QWidget *target = [self dragTargetHitTest:sender];
    if (!target)
        return [super draggingExited:sender];

    if (*currentDragTarget()) {
        [reinterpret_cast<NSView *>((*currentDragTarget())->winId()) draggingExited:sender];
        *currentDragTarget() = 0;
    }
}

- (BOOL)performDragOperation:(id < NSDraggingInfo >)sender
{
    QWidget *target = [self dragTargetHitTest:sender];
    if (!target)
        return [super performDragOperation:sender];

    BOOL dropResult = NO;
    if (*currentDragTarget()) {
        dropResult = [reinterpret_cast<NSView *>((*currentDragTarget())->winId()) performDragOperation:sender];
        *currentDragTarget() = 0;
    }
    return dropResult;
}