/*

 * Copyright (C) 2006 Apple Computer, Inc.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public License

 * along with this library; see the file COPYING.LIB.  If not, write to

 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 */

#import "config.h"

#import "PopupMenu.h"

#import "EventHandler.h"

#import "FontData.h"

#import "Frame.h"

#import "FrameView.h"

#import "HTMLNames.h"

#import "HTMLOptGroupElement.h"

#import "HTMLOptionElement.h"

#import "HTMLSelectElement.h"

#import "WebCoreSystemInterface.h"

namespace WebCore {

using namespace HTMLNames;

PopupMenu::PopupMenu(PopupMenuClient* client)

    : m_popupClient(client)

{

}

PopupMenu::~PopupMenu()

{

    if (m_popup)

        [m_popup.get() setControlView:nil];

}

void PopupMenu::clear()

{

    if (m_popup)

        [m_popup.get() removeAllItems];

}

void PopupMenu::populate()

{

    if (m_popup)

        clear();

    else {

        m_popup = [[NSPopUpButtonCell alloc] initTextCell:@"" pullsDown:!client()->shouldPopOver()];

        [m_popup.get() release]; // release here since the RetainPtr has retained the object already

        [m_popup.get() setUsesItemFromMenu:NO];

        [m_popup.get() setAutoenablesItems:NO];

    }

    BOOL messagesEnabled = [[m_popup.get() menu] menuChangedMessagesEnabled];

    [[m_popup.get() menu] setMenuChangedMessagesEnabled:NO];

    // For pullDown menus the first item is hidden.

    if (!client()->shouldPopOver())

        [m_popup.get() addItemWithTitle:@""];

    ASSERT(client());

    int size = client()->listSize();

    for (int i = 0; i < size; i++) {

        if (client()->itemIsSeparator(i))

            [[m_popup.get() menu] addItem:[NSMenuItem separatorItem]];

        else {

            RenderStyle* style = client()->itemStyle(i);

            NSMutableDictionary* attributes = [[NSMutableDictionary alloc] init];

            if (style->font() != Font())

                [attributes setObject:style->font().primaryFont()->getNSFont() forKey:NSFontAttributeName];

            // FIXME: Add support for styling the foreground and background colors.

            // FIXME: Find a way to customize text color when an item is highlighted.

            NSAttributedString* string = [[NSAttributedString alloc] initWithString:client()->itemText(i) attributes:attributes];

            [attributes release];

            [m_popup.get() addItemWithTitle:@""];

            NSMenuItem* menuItem = [m_popup.get() lastItem];

            [menuItem setAttributedTitle:string];

            [menuItem setEnabled:client()->itemIsEnabled(i)];

            [string release];

        }

    }

    [[m_popup.get() menu] setMenuChangedMessagesEnabled:messagesEnabled];

}

void PopupMenu::show(const IntRect& r, FrameView* v, int index)

{

    populate();

    int numItems = [m_popup.get() numberOfItems];

    if (numItems <= 0) {

        if (client())

            client()->hidePopup();

        return;

    }

    ASSERT(numItems > index);

    // Workaround for crazy bug where a selected index of -1 for a menu with only 1 item will cause a blank menu.

    if (index == -1 && numItems == 2 && !client()->shouldPopOver() && ![[m_popup.get() itemAtIndex:1] isEnabled])

        index = 0;

    NSView* view = v->getDocumentView();

    [m_popup.get() attachPopUpWithFrame:r inView:view];

    [m_popup.get() selectItemAtIndex:index];

    NSMenu* menu = [m_popup.get() menu];

    NSPoint location;

    NSFont* font = client()->clientStyle()->font().primaryFont()->getNSFont();

    // These values were borrowed from AppKit to match their placement of the menu.

    const int popOverHorizontalAdjust = -10;

    const int popUnderHorizontalAdjust = 6;

    const int popUnderVerticalAdjust = 6;

    if (client()->shouldPopOver()) {

        NSRect titleFrame = [m_popup.get() titleRectForBounds:r];

        if (titleFrame.size.width <= 0 || titleFrame.size.height <= 0)

            titleFrame = r;

        float vertOffset = roundf((NSMaxY(r) - NSMaxY(titleFrame)) + NSHeight(titleFrame));

        // Adjust for fonts other than the system font.

        NSFont* defaultFont = [NSFont systemFontOfSize:[font pointSize]];

        vertOffset += [font descender] - [defaultFont descender];

        vertOffset = fminf(NSHeight(r), vertOffset);

        location = NSMakePoint(NSMinX(r) + popOverHorizontalAdjust, NSMaxY(r) - vertOffset);

    } else

        location = NSMakePoint(NSMinX(r) + popUnderHorizontalAdjust, NSMaxY(r) + popUnderVerticalAdjust);    

    // Save the current event that triggered the popup, so we can clean up our event

    // state after the NSMenu goes away.

    RefPtr<Frame> frame = v->frame();

    NSEvent* event = [frame->eventHandler()->currentNSEvent() retain];

    RefPtr<PopupMenu> protector(this);

    RetainPtr<NSView> dummyView(AdoptNS, [[NSView alloc] initWithFrame:r]);

    [view addSubview:dummyView.get()];

    location = [dummyView.get() convertPoint:location fromView:view];

    frame->willPopupMenu(menu);

    wkPopupMenu(menu, location, roundf(NSWidth(r)), dummyView.get(), index, font);

    [m_popup.get() dismissPopUp];

    [dummyView.get() removeFromSuperview];

    if (client()) {

        int newIndex = [m_popup.get() indexOfSelectedItem];

        client()->hidePopup();

        // Adjust newIndex for hidden first item.

        if (!client()->shouldPopOver())

            newIndex--;

        if (index != newIndex && newIndex >= 0)

            client()->valueChanged(newIndex);

        // Give the frame a chance to fix up its event state, since the popup eats all the

        // events during tracking.

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

    }

    [event release];

}

void PopupMenu::hide()

{

    [m_popup.get() dismissPopUp];

}

void PopupMenu::updateFromElement()

{

}

bool PopupMenu::itemWritingDirectionIsNatural()

{

    return true;

}

}