/**

 * This file is part of the HTML widget for KDE.

 *

 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)

 * Copyright (C) 2000 Dirk Mueller (mueller@kde.org)

 * Copyright (C) 2004, 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.

 *

 */

#include "config.h"

#include "RenderWidget.h"

#include "AXObjectCache.h"

#include "Document.h"

#include "Element.h"

#include "Event.h"

#include "EventNames.h"

#include "FrameView.h"

#include "GraphicsContext.h"

#include "RenderLayer.h"

#include "RenderView.h"

using namespace std;

namespace WebCore {

using namespace EventNames;

static HashMap<const Widget*, RenderWidget*>& widgetRendererMap()

{

    return *staticWidgetRendererMap;

}

RenderWidget::RenderWidget(Node* node)

      : RenderReplaced(node)

      , m_widget(0)

      , m_refCount(0)

{

    // a replaced element doesn't support being anonymous

    ASSERT(node);

    m_view = node->document()->view();

    view()->addWidget(this);

    // Reference counting is used to prevent the widget from being

    // destroyed while inside the Widget code, which might not be

    // able to handle that.

    ref();

}

void RenderWidget::destroy()

{

    // We can't call the base class's destroy because we don't

    // want to unconditionally delete ourselves (we're ref-counted).

    // So the code below includes copied and pasted contents of

    // both RenderBox::destroy() and RenderObject::destroy().

    // Fix originally made for <rdar://problem/4228818>.

    if (RenderView* v = view())

        v->removeWidget(this);

    document()->axObjectCache()->remove(this);

    remove();

    if (m_widget) {

        if (m_view)

            m_view->removeChild(m_widget);

        widgetRendererMap().remove(m_widget);

    }

    // removes from override size map

    if (hasOverrideSize())

        setOverrideSize(-1);

    RenderLayer* layer = m_layer;

    RenderArena* arena = renderArena();

    if (layer)

        layer->clearClipRect();

    setNode(0);

    deref(arena);

    if (layer)

        layer->destroy(arena);

}

RenderWidget::~RenderWidget()

{

    ASSERT(m_refCount <= 0);

    deleteWidget();

}

void RenderWidget::resizeWidget(Widget* widget, int w, int h)

{

    if (element() && (widget->width() != w || widget->height() != h)) {

        RenderArena* arena = ref();

        element()->ref();

        widget->resize(w, h);

        element()->deref();

        deref(arena);

    }

}

void RenderWidget::setWidget(Widget* widget)

{

    if (widget != m_widget) {

        if (m_widget) {

            widgetRendererMap().remove(m_widget);

            deleteWidget();

        }

        m_widget = widget;

        if (m_widget) {

            widgetRendererMap().add(m_widget, this);

            // if we've already received a layout, apply the calculated space to the

            // widget immediately, but we have to have really been full constructed (with a non-null

            // style pointer).

            if (!needsLayout() && style())

                resizeWidget(m_widget,

                    m_width - borderLeft() - borderRight() - paddingLeft() - paddingRight(),

                    m_height - borderTop() - borderBottom() - paddingTop() - paddingBottom());

            if (style()) {

                if (style()->visibility() != VISIBLE)

                    m_widget->hide();

                else

                    m_widget->show();

            }

            m_view->addChild(m_widget);

        }

    }

}

void RenderWidget::layout()

{

    ASSERT(needsLayout());

    setNeedsLayout(false);

}

void RenderWidget::setStyle(RenderStyle* newStyle)

{

    RenderReplaced::setStyle(newStyle);

    if (m_widget) {

        if (style()->visibility() != VISIBLE)

            m_widget->hide();

        else

            m_widget->show();

    }

}

void RenderWidget::paint(PaintInfo& paintInfo, int tx, int ty)

{

    if (!shouldPaint(paintInfo, tx, ty))

        return;

    tx += m_x;

    ty += m_y;

    if (hasBoxDecorations() && paintInfo.phase != PaintPhaseOutline && paintInfo.phase != PaintPhaseSelfOutline)

        paintBoxDecorations(paintInfo, tx, ty);

#if PLATFORM(SYMBIAN)

    if (m_widget && paintInfo.phase == PaintPhaseOutline && style()->outlineWidth() && style()->visibility() == VISIBLE)

        paintOutline(paintInfo.context, tx, ty, width(), height(), style());

#endif

    if (!m_view || paintInfo.phase != PaintPhaseForeground || style()->visibility() != VISIBLE)

        return;

#if PLATFORM(MAC)

    if (style()->highlight() != nullAtom && !paintInfo.context->paintingDisabled())

        paintCustomHighlight(tx - m_x, ty - m_y, style()->highlight(), true);

#endif

    if (m_widget) {

        // Move the widget if necessary.  We normally move and resize widgets during layout, but sometimes

        // widgets can move without layout occurring (most notably when you scroll a document that

        // contains fixed positioned elements).

        m_widget->move(tx + borderLeft() + paddingLeft(), ty + borderTop() + paddingTop());

        // Tell the widget to paint now.  This is the only time the widget is allowed

        // to paint itself.  That way it will composite properly with z-indexed layers.

        m_widget->paint(paintInfo.context, paintInfo.rect);

    }

    // Paint a partially transparent wash over selected widgets.

    if (isSelected() && !document()->printing())

        paintInfo.context->fillRect(selectionRect(), selectionBackgroundColor());

}

void RenderWidget::deref(RenderArena *arena)

{

    if (--m_refCount <= 0)

        arenaDelete(arena, this);

}

void RenderWidget::updateWidgetPosition()

{

    if (!m_widget)

        return;

    int x;

    int y;

    absolutePosition(x, y);

    x += borderLeft() + paddingLeft();

    y += borderTop() + paddingTop();

    int width = m_width - borderLeft() - borderRight() - paddingLeft() - paddingRight();

    int height = m_height - borderTop() - borderBottom() - paddingTop() - paddingBottom();

    IntRect newBounds(x, y, width, height);

    IntRect oldBounds(m_widget->frameGeometry());

    if (newBounds != oldBounds) {

        // The widget changed positions.  Update the frame geometry.

        if (checkForRepaintDuringLayout()) {

            RenderView* v = view();

            if (!v->printing()) {

                v->repaintViewRectangle(oldBounds);

                v->repaintViewRectangle(newBounds);

            }

        }

        RenderArena* arena = ref();

        element()->ref();

        m_widget->setFrameGeometry(newBounds);

        element()->deref();

        deref(arena);

    }

}

void RenderWidget::setSelectionState(SelectionState state)

{

    if (selectionState() != state) {

        RenderReplaced::setSelectionState(state);

        if (m_widget)

            m_widget->setIsSelected(isSelected());

    }

}

void RenderWidget::deleteWidget()

{

    delete m_widget;

}

RenderWidget* RenderWidget::find(const Widget* widget)

{

    return widgetRendererMap().get(widget);

}

} // namespace WebCore