/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

import QtQuick 1.0
import QtWebKit 1.0

Flickable {
    property alias title: webView.title
    property alias icon: webView.icon
    property alias progress: webView.progress
    property alias url: webView.url
    property alias back: webView.back
    property alias stop: webView.stop
    property alias reload: webView.reload
    property alias forward: webView.forward

    id: flickable
    width: parent.width
    contentWidth: Math.max(parent.width,webView.width)
    contentHeight: Math.max(parent.height,webView.height)
    anchors.top: headerSpace.bottom
    anchors.bottom: parent.top
    anchors.left: parent.left
    anchors.right: parent.right
    pressDelay: 200

    onWidthChanged : {
        // Expand (but not above 1:1) if otherwise would be smaller that available width.
        if (width > webView.width*webView.contentsScale && webView.contentsScale < 1.0)
            webView.contentsScale = width / webView.width * webView.contentsScale;
    }

    WebView {
        id: webView
        transformOrigin: Item.TopLeft

        function fixUrl(url)
        {
            if (url == "") return url
            if (url[0] == "/") return "file://"+url
            if (url.indexOf(":")<0) {
                if (url.indexOf(".")<0 || url.indexOf(" ")>=0) {
                    // Fall back to a search engine; hard-code Wikipedia
                    return "http://en.wikipedia.org/w/index.php?search="+url
                } else {
                    return "http://"+url
                }
            }
            return url
        }

        url: fixUrl(webBrowser.urlString)
        smooth: false // We don't want smooth scaling, since we only scale during (fast) transitions
        focus: true

        onAlert: console.log(message)

        function doZoom(zoom,centerX,centerY)
        {
            if (centerX) {
                var sc = zoom*contentsScale;
                scaleAnim.to = sc;
                flickVX.from = flickable.contentX
                flickVX.to = Math.max(0,Math.min(centerX-flickable.width/2,webView.width*sc-flickable.width))
                finalX.value = flickVX.to
                flickVY.from = flickable.contentY
                flickVY.to = Math.max(0,Math.min(centerY-flickable.height/2,webView.height*sc-flickable.height))
                finalY.value = flickVY.to
                quickZoom.start()
            }
        }

        Keys.onLeftPressed: webView.contentsScale -= 0.1
        Keys.onRightPressed: webView.contentsScale += 0.1

        preferredWidth: flickable.width
        preferredHeight: flickable.height
        contentsScale: 1
        onContentsSizeChanged: {
            // zoom out
            contentsScale = Math.min(1,flickable.width / contentsSize.width)
        }
        onUrlChanged: {
            // got to topleft
            flickable.contentX = 0
            flickable.contentY = 0
            if (url != null) { header.editUrl = url.toString(); }
        }
        onDoubleClick: {
                        if (!heuristicZoom(clickX,clickY,2.5)) {
                            var zf = flickable.width / contentsSize.width
                            if (zf >= contentsScale)
                                zf = 2.0*contentsScale // zoom in (else zooming out)
                            doZoom(zf,clickX*zf,clickY*zf)
                         }
                       }

        SequentialAnimation {
            id: quickZoom

            PropertyAction {
                target: webView
                property: "renderingEnabled"
                value: false
            }
            ParallelAnimation {
                NumberAnimation {
                    id: scaleAnim
                    target: webView
                    property: "contentsScale"
                    // the to property is set before calling
                    easing.type: Easing.Linear
                    duration: 200
                }
                NumberAnimation {
                    id: flickVX
                    target: flickable
                    property: "contentX"
                    easing.type: Easing.Linear
                    duration: 200
                    from: 0 // set before calling
                    to: 0 // set before calling
                }
                NumberAnimation {
                    id: flickVY
                    target: flickable
                    property: "contentY"
                    easing.type: Easing.Linear
                    duration: 200
                    from: 0 // set before calling
                    to: 0 // set before calling
                }
            }
            // Have to set the contentXY, since the above 2
            // size changes may have started a correction if
            // contentsScale < 1.0.
            PropertyAction {
                id: finalX
                target: flickable
                property: "contentX"
                value: 0 // set before calling
            }
            PropertyAction {
                id: finalY
                target: flickable
                property: "contentY"
                value: 0 // set before calling
            }
            PropertyAction {
                target: webView
                property: "renderingEnabled"
                value: true
            }
        }
        onZoomTo: doZoom(zoom,centerX,centerY)
    }
}