/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 2011 Martin Gräßlin <mgraesslin@kde.org>
Copyright (C) 2013 Marco Martin <mart@kde.org>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
import QtQuick 2.0
import org.kde.plasma.core 2.0 as PlasmaCore
import org.kde.plasma.components 2.0 as PlasmaComponents
import org.kde.plasma.extras 2.0 as PlasmaExtras
import org.kde.qtextracomponents 2.0
import org.kde.kwin 0.1 as KWin

Item {
    id: thumbnailTabBox
    property int screenWidth : 1
    property int screenHeight : 1
    property real screenFactor: screenWidth/screenHeight
    property int imagePathPrefix: (new Date()).getTime()
    property int alignment: Qt.AlignLeft|Qt.AlignVCenter

    property int optimalWidth: (thumbnailListView.thumbnailWidth + hoverItem.margins.left + hoverItem.margins.right) + background.leftMargin + background.bottomMargin

    property bool canStretchX: false
    property bool canStretchY: false
    property string maskImagePath: background.maskImagePath
    property double maskWidth: background.centerWidth
    property double maskHeight: background.centerHeight
    property int maskTopMargin: background.centerTopMargin
    property int maskLeftMargin: background.centerLeftMargin
    width: Math.min(Math.max(screenWidth * 0.15, optimalWidth), screenWidth * 0.3)
    height: screenHeight
    clip: true
    focus: true


    function setModel(model) {
        thumbnailListView.model = model;
        thumbnailListView.imageId++;
    }

    function modelChanged() {
        thumbnailListView.imageId++;
    }

    ShadowedSvgItem {
        id: background
        anchors.fill: parent
        enabledBorders: PlasmaCore.FrameSvg.RightBorder
    }
    // just to get the margin sizes
    PlasmaCore.FrameSvgItem {
        id: hoverItem
        imagePath: "widgets/viewitem"
        prefix: "hover"
        visible: false
    }

    PlasmaExtras.ScrollArea {
        anchors {
            fill: parent
            topMargin: background.topMargin
            leftMargin: background.leftMargin
            rightMargin: background.rightMargin
            bottomMargin: background.bottomMargin
        }
        ListView {
            signal currentIndexChanged(int index)
            id: thumbnailListView
            objectName: "listView"
            orientation: ListView.Vertical
            // used for image provider URL to trick Qt into reloading icons when the model changes
            property int imageId: 0
            property int thumbnailWidth: width
            height: thumbnailWidth * (1.0/screenFactor) + hoverItem.margins.bottom + hoverItem.margins.top
            spacing: 5
            highlightMoveDuration: 250
            width: Math.min(parent.width - (anchors.leftMargin + anchors.rightMargin) - (hoverItem.margins.left + hoverItem.margins.right), thumbnailWidth * count + 5 * (count - 1))

            clip: true
            delegate: Item {
                property alias data: thumbnailItem.data
                id: delegateItem
                width: thumbnailListView.thumbnailWidth
                height: thumbnailListView.thumbnailWidth*(1.0/screenFactor) + label.height + 30
                KWin.ThumbnailItem {
                    property variant data: model
                    id: thumbnailItem
                    wId: windowId
                    anchors {
                        centerIn: parent
                    }
                    width: thumbnailListView.thumbnailWidth
                    height: thumbnailListView.thumbnailWidth*(1.0/screenFactor)
                }
                MouseArea {
                    anchors.fill: parent
                    onClicked: {
                        thumbnailListView.currentIndex = index;
                        thumbnailListView.currentIndexChanged(thumbnailListView.currentIndex);
                    }
                }
                Row {
                    id: label
                    spacing: 4
                    anchors {
                        left: parent.left
                        bottom: parent.bottom
                        leftMargin: 8
                        bottomMargin: 8
                    }
                    Image {
                        id: iconItem
                        source: "image://client/" + index + "/" + thumbnailTabBox.imagePathPrefix + "-" + thumbnailListView.imageId
                        width: 32
                        height: 32
                        sourceSize {
                            width: 32
                            height: 32
                        }
                    }
                    PlasmaComponents.Label {
                        text: model.caption
                        anchors.verticalCenter: parent.verticalCenter
                    }
                }
            }
            highlight: PlasmaCore.FrameSvgItem {
                id: highlightItem
                imagePath: "widgets/viewitem"
                prefix: "hover"
                width: thumbnailListView.thumbnailWidth
                height: thumbnailListView.thumbnailWidth*(1.0/screenFactor)
            }
            boundsBehavior: Flickable.StopAtBounds
        }
    }

    /*
     * Key navigation on outer item for two reasons:
     * @li we have to emit the change signal
     * @li on multiple invocation it does not work on the list view. Focus seems to be lost.
     **/
    Keys.onPressed: {
        if (event.key == Qt.Key_Up) {
            thumbnailListView.decrementCurrentIndex();
            thumbnailListView.currentIndexChanged(thumbnailListView.currentIndex);
        } else if (event.key == Qt.Key_Down) {
            thumbnailListView.incrementCurrentIndex();
            thumbnailListView.currentIndexChanged(thumbnailListView.currentIndex);
        }
    }
}