/*

 * Copyright (C) 2004, 2005, 2006 Apple Computer, 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 "Widget.h"

#import "BlockExceptions.h"

#import "Cursor.h"

#import "Document.h"

#import "Font.h"

#import "Frame.h"

#import "GraphicsContext.h"

#import "Page.h"

#import "PlatformMouseEvent.h"

#import "WebCoreFrameBridge.h"

#import "WebCoreFrameView.h"

#import "WebCoreView.h"

#import "WidgetClient.h"

#import <wtf/RetainPtr.h>

@interface NSWindow (WindowPrivate)

- (BOOL) _needsToResetDragMargins;

- (void) _setNeedsToResetDragMargins:(BOOL)s;

@end

namespace WebCore {

class WidgetPrivate {

public:

    RetainPtr<NSView> view;

    WidgetClient* client;

    bool visible;

    bool mustStayInWindow;

    bool removeFromSuperviewSoon;

};

static void safeRemoveFromSuperview(NSView *view)

{

    // If the the view is the first responder, then set the window's first responder to nil so

    // we don't leave the window pointing to a view that's no longer in it.

    NSWindow *window = [view window];

    NSResponder *firstResponder = [window firstResponder];

    if ([firstResponder isKindOfClass:[NSView class]] && [(NSView *)firstResponder isDescendantOf:view])

        [window makeFirstResponder:nil];

    // Suppress the resetting of drag margins since we know we can't affect them.

    BOOL resetDragMargins = [window _needsToResetDragMargins];

    [window _setNeedsToResetDragMargins:NO];

    [view removeFromSuperview];

    [window _setNeedsToResetDragMargins:resetDragMargins];

}

Widget::Widget() : data(new WidgetPrivate)

{

    data->view = nil;

    data->client = 0;

    data->visible = true;

    data->mustStayInWindow = false;

    data->removeFromSuperviewSoon = false;

}

Widget::Widget(NSView* view) : data(new WidgetPrivate)

{

    data->view = view;

    data->client = 0;

    data->visible = true;

    data->mustStayInWindow = false;

    data->removeFromSuperviewSoon = false;

}

Widget::~Widget() 

{

    delete data;

}

void Widget::setEnabled(bool enabled)

{

    id view = data->view.get();

    BEGIN_BLOCK_OBJC_EXCEPTIONS;

    if ([view respondsToSelector:@selector(setEnabled:)]) {

        [view setEnabled:enabled];

    }

    END_BLOCK_OBJC_EXCEPTIONS;

}

bool Widget::isEnabled() const

{

    id view = data->view.get();

    BEGIN_BLOCK_OBJC_EXCEPTIONS;

    if ([view respondsToSelector:@selector(isEnabled)]) {

        return [view isEnabled];

    }

    END_BLOCK_OBJC_EXCEPTIONS;

    return true;

}

IntRect Widget::frameGeometry() const

{

    BEGIN_BLOCK_OBJC_EXCEPTIONS;

    return enclosingIntRect([getOuterView() frame]);

    END_BLOCK_OBJC_EXCEPTIONS;

    return IntRect();

}

// FIXME: Should move this to Chrome; bad layering that this knows about Frame.

void Widget::setFocus()

{

    Frame* frame = Frame::frameForWidget(this);

    if (!frame)

        return;

    BEGIN_BLOCK_OBJC_EXCEPTIONS;

    NSView *view = [getView() _webcore_effectiveFirstResponder];

    if (Page* page = frame->page())

        page->chrome()->focusNSView(view);

    END_BLOCK_OBJC_EXCEPTIONS;

}

 void Widget::setCursor(const Cursor& cursor)

 {

    if ([NSCursor currentCursor] == cursor.impl())

        return;

    [cursor.impl() set];

}

void Widget::show()

{

    if (!data || data->visible)

        return;

    data->visible = true;

    BEGIN_BLOCK_OBJC_EXCEPTIONS;

    [getOuterView() setHidden:NO];

    END_BLOCK_OBJC_EXCEPTIONS;

}

void Widget::hide()

{

    if (!data || !data->visible)

        return;

    data->visible = false;

    BEGIN_BLOCK_OBJC_EXCEPTIONS;

    [getOuterView() setHidden:YES];

    END_BLOCK_OBJC_EXCEPTIONS;

}

void Widget::setFrameGeometry(const IntRect &rect)

{

    BEGIN_BLOCK_OBJC_EXCEPTIONS;

    NSView *v = getOuterView();

    NSRect f = rect;

    if (!NSEqualRects(f, [v frame])) {

        [v setFrame:f];

        [v setNeedsDisplay: NO];

    }

    END_BLOCK_OBJC_EXCEPTIONS;

}

NSView* Widget::getView() const

{

    return data->view.get();

}

void Widget::setView(NSView* view)

{

    BEGIN_BLOCK_OBJC_EXCEPTIONS;

    data->view = view;

    END_BLOCK_OBJC_EXCEPTIONS;

}

NSView* Widget::getOuterView() const

{

    // If this widget's view is a WebCoreFrameView the we resize its containing view, a WebFrameView.

    NSView* view = data->view.get();

    if ([view conformsToProtocol:@protocol(WebCoreFrameView)]) {

        view = [view superview];

        ASSERT(view);

    }

    return view;

}

void Widget::paint(GraphicsContext* p, const IntRect& r)

{

    if (p->paintingDisabled())

        return;

    NSView *view = getOuterView();

    BEGIN_BLOCK_OBJC_EXCEPTIONS;

    [view displayRectIgnoringOpacity:[view convertRect:r fromView:[view superview]]];

    END_BLOCK_OBJC_EXCEPTIONS;

}

void Widget::invalidate()

{

    BEGIN_BLOCK_OBJC_EXCEPTIONS;

    [getView() setNeedsDisplay: YES];

    END_BLOCK_OBJC_EXCEPTIONS;

}

void Widget::invalidateRect(const IntRect& r)

{

    BEGIN_BLOCK_OBJC_EXCEPTIONS;

    [getView() setNeedsDisplayInRect: r];

    END_BLOCK_OBJC_EXCEPTIONS;

}

// FIXME: Should move this to Chrome; bad layering that this knows about Frame.

void Widget::setIsSelected(bool isSelected)

{

    if (Frame* frame = Frame::frameForWidget(this))

        [frame->bridge() setIsSelected:isSelected forView:getView()];

}

void Widget::addToSuperview(NSView *view)

{

    BEGIN_BLOCK_OBJC_EXCEPTIONS;

    ASSERT(view);

    NSView *subview = getOuterView();

    ASSERT(![view isDescendantOf:subview]);

    // Suppress the resetting of drag margins since we know we can't affect them.

    NSWindow* window = [view window];

    BOOL resetDragMargins = [window _needsToResetDragMargins];

    [window _setNeedsToResetDragMargins:NO];

    if ([subview superview] != view)

        [view addSubview:subview];

    data->removeFromSuperviewSoon = false;

    [window _setNeedsToResetDragMargins:resetDragMargins];

    END_BLOCK_OBJC_EXCEPTIONS;

}

void Widget::removeFromSuperview()

{

    if (data->mustStayInWindow)

        data->removeFromSuperviewSoon = true;

    else {

        data->removeFromSuperviewSoon = false;

        BEGIN_BLOCK_OBJC_EXCEPTIONS;

        safeRemoveFromSuperview(getOuterView());

        END_BLOCK_OBJC_EXCEPTIONS;

    }

}

void Widget::beforeMouseDown(NSView *view, Widget* widget)

{

    if (widget) {

        ASSERT(view == widget->getOuterView());

        ASSERT(!widget->data->mustStayInWindow);

        widget->data->mustStayInWindow = true;

    }

}

void Widget::afterMouseDown(NSView *view, Widget* widget)

{

    if (!widget) {

        BEGIN_BLOCK_OBJC_EXCEPTIONS;

        safeRemoveFromSuperview(view);

        END_BLOCK_OBJC_EXCEPTIONS;

    } else {

        ASSERT(widget->data->mustStayInWindow);

        widget->data->mustStayInWindow = false;

        if (widget->data->removeFromSuperviewSoon)

            widget->removeFromSuperview();

    }

}

void Widget::setClient(WidgetClient* c)

{

    data->client = c;

}

WidgetClient* Widget::client() const

{

    return data->client;

}

void Widget::removeFromParent()

{

}

IntPoint Widget::convertToScreenCoordinate(NSView *view, const IntPoint& point)

{

    NSPoint conversionPoint = { point.x(), point.y() };

    conversionPoint = [view convertPoint:conversionPoint toView:nil];

    return globalPoint(conversionPoint, [view window]);

}

}