~pkunal-parmar/ubuntu-calendar-app/Minor-Performance

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/*
 * Copyright (C) 2013-2014 Canonical Ltd
 *
 * This file is part of Ubuntu Calendar App
 *
 * Ubuntu Calendar App is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation.
 *
 * Ubuntu Calendar App 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 2.3
import Ubuntu.Components 1.1

import "dateExt.js" as DateExt
Page {
    id: yearViewPage
    objectName: "yearViewPage"

    property int currentYear: DateExt.today().getFullYear();
    signal monthSelected(var date);

    Keys.forwardTo: [yearPathView]

    Action {
        id: calendarTodayAction
        objectName:"todaybutton"
        iconName: "calendar-today"
        text: i18n.tr("Today")
        onTriggered: {
            currentYear = new Date().getFullYear()
        }
    }

    head {
        actions: [
            calendarTodayAction,
            commonHeaderActions.newEventAction,
            commonHeaderActions.showCalendarAction,
            commonHeaderActions.reloadAction
        ]
    }

    PathViewBase {
        id: yearPathView
        objectName: "yearPathView"

        anchors.fill: parent

        onNextItemHighlighted: {
            currentYear = currentYear + 1;
        }

        onPreviousItemHighlighted: {
            currentYear = currentYear - 1;
        }

        delegate: GridView{
            id: yearView
            clip: true
            focus: index == yearPathView.currentIndex

            property int scrollMonth: 0;
            property bool isCurrentItem: index == yearPathView.currentIndex
            property int year: (yearViewPage.currentYear + yearPathView.indexType(index))

            width: parent.width
            height: parent.height
            anchors.top: parent.top

            readonly property int minCellWidth: units.gu(30)
            cellWidth: Math.floor(Math.min.apply(Math, [3, 4].map(function(n)
            { return ((width / n >= minCellWidth) ? width / n : width / 2) })))

            cellHeight: cellWidth * 1.4

            model: 12 /* months in a year */

            onYearChanged: {
                scrollMonth = 0;
                var today = new Date();
                if(year == today.getFullYear()) {
                    scrollMonth = today.getMonth();
                }
                yearView.positionViewAtIndex(scrollMonth, GridView.Beginning);
            }

            //scroll in case content height changed
            onHeightChanged: {
                yearView.positionViewAtIndex(scrollMonth, GridView.Beginning);
            }

            Component.onCompleted: {
                yearView.positionViewAtIndex(scrollMonth, GridView.Beginning);
            }

            Connections{
                target: yearPathView
                onScrollUp: {
                    scrollMonth -= 2;
                    if(scrollMonth < 0) {
                        scrollMonth = 0;
                    }
                    yearView.positionViewAtIndex(scrollMonth, GridView.Beginning);
                }

                onScrollDown: {
                    scrollMonth += 2;
                    var visibleMonths = yearView.height / cellHeight;
                    if( scrollMonth >= (11 - visibleMonths)) {
                        scrollMonth = (11 - visibleMonths);
                    }
                    yearView.positionViewAtIndex(scrollMonth, GridView.Beginning);
                }
            }

            delegate: Item {
                width: yearView.cellWidth
                height: yearView.cellHeight

                UbuntuShape {
                    anchors.fill: parent
                    anchors.margins: units.gu(0.5)
                    radius: "medium"

                    MonthComponent {
                        id: monthComponent
                        objectName: "monthComponent" + index
                        showEvents: false
                        currentMonth: new Date(yearView.year, index, 1, 0, 0, 0, 0)

                        isYearView: true
                        anchors.fill: parent

                        dayLabelFontSize:"x-small"
                        dateLabelFontSize: "medium"
                        monthLabelFontSize: "medium"
                        yearLabelFontSize: "small"

                        onMonthSelected: {
                            yearViewPage.monthSelected(date);
                        }
                    }
                }
            }
        }
    }
}