/*

 * Copyright (C) 2006, 2007 Apple Computer, Inc.  All rights reserved.

 * Copyright (C) 2006 Michael Emmel mike.emmel@gmail.com 

 * Copyright (C) 2007 Holger Hans Peter Freyther

 * 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. 

 */

#include "config.h"

#include "Widget.h"

#include "Cursor.h"

#include "FrameView.h"

#include "GraphicsContext.h"

#include "IntRect.h"

#include "NotImplemented.h"

#include "RenderObject.h"

#include <gdk/gdk.h>

#include <gtk/gtk.h>

namespace WebCore {

class WidgetPrivate {

public:

    GtkWidget* widget;

    WidgetClient* client;

    IntRect frameRect;

    ScrollView* parent;

    GtkContainer* containingWindow;

    bool suppressInvalidation;

    GdkDrawable* gdkDrawable() const

    {

        return widget ? widget->window : 0;

    }

};

Widget::Widget()

    : data(new WidgetPrivate)

{

    data->widget = 0;

    data->parent = 0;

    data->containingWindow = 0;

    data->suppressInvalidation = false;

}

GtkWidget* Widget::gtkWidget() const

{

    return data->widget;

}

void Widget::setGtkWidget(GtkWidget* widget)

{

    data->widget = widget;

}

Widget::~Widget()

{

    delete data;

}

void Widget::setContainingWindow(GtkContainer* containingWindow)

{

    data->containingWindow = containingWindow;

}

GtkContainer* Widget::containingWindow() const

{

    return data->containingWindow;

}

void Widget::setClient(WidgetClient* c)

{

    data->client = c;

}

WidgetClient* Widget::client() const

{

    return data->client;

}

IntRect Widget::frameGeometry() const

{

    return data->frameRect;

}

void Widget::setFrameGeometry(const IntRect& r)

{

    data->frameRect = r;

}

void Widget::setParent(ScrollView* v)

{

    data->parent = v;

}

ScrollView* Widget::parent() const

{

    return data->parent;

}

void Widget::setFocus()

{

    gtk_widget_grab_focus(gtkWidget() ? gtkWidget() : GTK_WIDGET(containingWindow()));

}

void Widget::setCursor(const Cursor& cursor)

{

    GdkCursor* pcur = cursor.impl();

    if (!pcur)

        return;

    gdk_window_set_cursor(data->gdkDrawable() ? GDK_WINDOW(data->gdkDrawable()) : GTK_WIDGET(containingWindow())->window, pcur);

}

void Widget::show()

{

    if (!gtkWidget())

         return;

    gtk_widget_show(gtkWidget());

}

void Widget::hide()

{

    if (!gtkWidget())

         return;

    gtk_widget_hide(gtkWidget());

}

void Widget::setEnabled(bool)

{

    notImplemented();

}

bool Widget::isEnabled() const

{

    notImplemented();

    return false;

}

void Widget::removeFromParent()

{

    if (parent())

        parent()->removeChild(this);

}

/*

 * Strategy to painting a Widget:

 *  1.) do not paint if there is no GtkWidget set

 *  2.) We assume that GTK_NO_WINDOW is set and that geometryChanged positioned

 *      the widget correctly. ATM we do not honor the GraphicsContext translation.

 */

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

{

    if (!gtkWidget())

        return;

    GtkWidget* widget = gtkWidget();

    ASSERT(GTK_WIDGET_NO_WINDOW(widget));

    GdkEvent* event = gdk_event_new(GDK_EXPOSE);

    event->expose = *context->gdkExposeEvent();

    event->expose.region = gtk_widget_region_intersect(widget, event->expose.region);

    /*

     * This will be unref'ed by gdk_event_free.

     */

    g_object_ref(event->expose.window);

    /*

     * If we are going to paint do the translation and GtkAllocation manipulation.

     */

    if (!gdk_region_empty(event->expose.region)) {

        gdk_region_get_clipbox(event->expose.region, &event->expose.area);

        gtk_widget_send_expose(widget, event);

    }

    gdk_event_free(event);

}

void Widget::setIsSelected(bool)

{

    notImplemented();

}

void Widget::invalidate()

{

    invalidateRect(IntRect(0, 0, width(), height()));

}

void Widget::invalidateRect(const IntRect& rect)

{

    if (data->suppressInvalidation)

        return;

    if (!parent()) {

        gtk_widget_queue_draw_area(GTK_WIDGET(containingWindow()), rect.x(), rect.y(),

                                   rect.width(), rect.height());

        if (isFrameView())

            static_cast<FrameView*>(this)->addToDirtyRegion(rect);

        return;

    }

    // Get the root widget.

    ScrollView* outermostView = parent();

    while (outermostView && outermostView->parent())

        outermostView = outermostView->parent();

    if (!outermostView)

        return;

    IntRect windowRect = convertToContainingWindow(rect);

    gtk_widget_queue_draw_area(GTK_WIDGET(containingWindow()), windowRect.x(), windowRect.y(),

                               windowRect.width(), windowRect.height());

    outermostView->addToDirtyRegion(windowRect);

}

IntPoint Widget::convertToContainingWindow(const IntPoint& point) const

{

    IntPoint windowPoint = point;

    for (const Widget *parentWidget = parent(), *childWidget = this;

         parentWidget;

         childWidget = parentWidget, parentWidget = parentWidget->parent())

        windowPoint = parentWidget->convertChildToSelf(childWidget, windowPoint);

    return windowPoint;

}

IntPoint Widget::convertFromContainingWindow(const IntPoint& point) const

{

    IntPoint widgetPoint = point;

    for (const Widget *parentWidget = parent(), *childWidget = this;

         parentWidget;

         childWidget = parentWidget, parentWidget = parentWidget->parent())

        widgetPoint = parentWidget->convertSelfToChild(childWidget, widgetPoint);

    return widgetPoint;

}

IntRect Widget::convertToContainingWindow(const IntRect& rect) const

{

    IntRect convertedRect = rect;

    convertedRect.setLocation(convertToContainingWindow(convertedRect.location()));

    return convertedRect;

}

IntPoint Widget::convertChildToSelf(const Widget* child, const IntPoint& point) const

{

    return IntPoint(point.x() + child->x(), point.y() + child->y());

}

IntPoint Widget::convertSelfToChild(const Widget* child, const IntPoint& point) const

{

    return IntPoint(point.x() - child->x(), point.y() - child->y());

}

bool Widget::suppressInvalidation() const

{

    return data->suppressInvalidation;

}

void Widget::setSuppressInvalidation(bool suppress)

{

    data->suppressInvalidation = suppress;

}

void Widget::geometryChanged() const

{

}

}