MonthView.qml

// Copyright (C) 2023 Camilo Higuita, <milo.h@kaol.com>
// Copyright (C) 2018 Michael Bohlender, <bohlender@kolabsys.com>
// Copyright (C) 2018 Christian Mollekopf, <mollekopf@kolabsys.com>
// SPDX-FileCopyrightText: 2021 Claudio Cambra <claudio.cambra@gmail.com>
// SPDX-License-Identifier: GPL-2.0-or-later
 
import QtQuick
import QtQuick.Layouts
import QtQuick.Controls 
 
import org.mauikit.controls 1.3 as Maui
import org.mauikit.calendar 1.0 as Kalendar
 
import "dateutils.js" as DateUtils
 
/**
 * @inherit QtQuick.Controls.Pane
 * @brief A view for browsing the calendar months and its days.
 * 
 * @image html monthview_sizes.png "MonthView control with different sizes"
 * 
 * 
 * @code
 * Maui.Page
 * {
 *    anchors.fill: parent
 *    Maui.Controls.showCSD: true
 * 
 *    title: _monthsView.title
 * 
 *    headBar.rightContent: Maui.ToolActions
 *    {
 *        checkable: false
 *        Action
 *        {
 *            icon.name: "go-previous"
 *            onTriggered: _monthsView.previousDate()
 *        }
 * 
 *        Action
 *        {
 *            icon.name: "go-next"
 *            onTriggered: _monthsView.nextDate()
 * 
 *        }
 *    }
 * 
 *    MC.MonthView
 *    {
 *        id: _monthsView
 *        anchors.fill: parent
 *    }
 * }
 * @endcode
 */
Pane
{
    id: control
    
    padding : 0
    
    /**
     * @brief
     */
    readonly property date currentDate: new Date()
    
    /**
     * @brief
     */
    readonly property string title: Qt.formatDate(pathView.currentItem.firstDayOfMonth, "MMM yyyy")
    
    /**
     * @brief
     */
    property var openOccurrence: ({})
    
    /**
     * @brief
     */
    property var filter: {
        "collectionId": -1,
        "tags": [],
        "name": ""
    }
    
    /**
     * @brief
     */
    readonly property alias model :  _monthViewModel
    
    /**
     * @brief
     */
    property date startDate
    
    /**
     * @brief
     */
    property date firstDayOfMonth
    
    /**
     * @brief
     */
    property int month
    
    /**
     * @brief
     */
    property int year
    
    /**
     * @brief
     */
    property bool initialMonth: true
    
    /**
     * @brief
     */
    readonly property bool isLarge: width > Maui.Style.units.gridUnit * 40
    
    /**
     * @brief
     */
    readonly property bool isTiny: width < Maui.Style.units.gridUnit * 18
    
    /**
     * @brief
     */
    property date selectedDate : currentDate
    
    /**
     * @brief
     */
    property bool dragDropEnabled: true
    
    /**
     * @brief
     */
    property alias interactive : pathView.interactive
    
    /**
     * @brief
     */
    signal dateClicked(var date)
    
    /**
     * @brief
     */
    signal dateRightClicked(var date)
    
    /**
     * @brief
     */
    signal dateDoubleClicked(var date)
    
    background: Rectangle
    {
        color: Maui.Theme.backgroundColor
    }
    
    Kalendar.InfiniteCalendarViewModel
    {
        id: _monthViewModel
        scale: Kalendar.InfiniteCalendarViewModel.MonthScale
    }
    
    contentItem: PathView
    {
        id: pathView
        
        flickDeceleration: Maui.Style.units.longDuration
        interactive: Maui.Handy.isMobile
        
        preferredHighlightBegin: 0.5
        preferredHighlightEnd: 0.5
        
        //                   highlightRangeMode: ListView.StrictlyEnforceRange
        highlightMoveDuration: 0
        //        spacing: 10
        snapMode: PathView.SnapToItem
        focus: true
        //        interactive: Kirigami.Settings.tabletMode
        
        path: Path {
            startX: - pathView.width * pathView.count / 2 + pathView.width / 2
            startY: pathView.height / 2
            PathLine {
                x: pathView.width * pathView.count / 2 + pathView.width / 2
                y: pathView.height / 2
            }
        }
        
        model: control.model
        
        property int startIndex
        
        Component.onCompleted:
        {
            startIndex = count / 2;
            currentIndex = startIndex;
        }
        
        onCurrentIndexChanged:
        {
            control.startDate = currentItem.startDate;
            control.firstDayOfMonth = currentItem.firstDayOfMonth;
            control.month = currentItem.month;
            control.year = currentItem.year;
            
            if(currentIndex >= count - 2) {
                model.addDates(true);
            } else if (currentIndex <= 1) {
                model.addDates(false);
                startIndex += model.datesToAdd;
            }
        }
        
        delegate: Loader
        {
            id: viewLoader
            
            property date startDate: model.startDate
            property date firstDayOfMonth: model.firstDay
            property int month: model.selectedMonth - 1 // Convert QDateTime month to JS month
            property int year: model.selectedYear
            
            property bool isNextOrCurrentItem: index >= pathView.currentIndex -1 && index <= pathView.currentIndex + 1
            property bool isCurrentItem: PathView.isCurrentItem
            
            active: isNextOrCurrentItem
            asynchronous: !isCurrentItem
            visible: status === Loader.Ready
            
            sourceComponent: Kalendar.DayGridView
            {
                id: dayView
                objectName: "monthView"
                
                width: pathView.width
                height: pathView.height
                
                //                model: monthViewModel // from control model
                isCurrentView: viewLoader.isCurrentItem
                dragDropEnabled: control.dragDropEnabled
                
                startDate: viewLoader.startDate
                currentDate: control.currentDate
                month: viewLoader.month
                
                
                
                onDateClicked: 
                {
                    
                    control.selectedDate = date
                    control.dateClicked(control.selectedDate)
                }
                
                onDateDoubleClicked:
                {
                    control.selectedDate = date
                    control.dateDoubleClicked(control.selectedDate)
                }
                
                dayHeaderDelegate: ItemDelegate
                {
                    leftPadding: Maui.Style.units.smallSpacing
                    rightPadding: Maui.Style.units.smallSpacing
                    
                    contentItem: Label
                    {
                        text:
                        {
                            let longText = day.toLocaleString(Qt.locale(), "dddd");
                            let midText = day.toLocaleString(Qt.locale(), "ddd");
                            let shortText = midText.slice(0,1);
                            
                            
                            return control.isTiny ? shortText : midText;
                        }
                        
                        
                        horizontalAlignment: Text.AlignLeft
                        font.bold: true
                        font.weight: Font.Bold
                        font.pointSize: Maui.Style.fontSizes.big
                        
                        
                    }                   
                    
                    
                }
                
                weekHeaderDelegate: Maui.LabelDelegate
                {
                    padding: Maui.Style.units.smallSpacing
                    //                                        verticalAlignment: Qt.AlignTop
                    label.horizontalAlignment: Qt.AlignHCenter
                    text: DateUtils.getWeek(startDate, Qt.locale().firstDayOfWeek)
                    //                    background: Rectangle {
                    //                        Kirigami.Theme.inherit: false
                    //                        Kirigami.Theme.colorSet: Kirigami.Theme.View
                    //                        color: Kirigami.Theme.backgroundColor
                    //                    }
                }
                
                openOccurrence: control.openOccurrence
            }
        }
    }
    
    /**
     * @brief
     */
    function resetDate()
    {
        setToDate(new Date())
    }
    
    /**
     * @brief
     */
    function nextDate()
    {
        setToDate(DateUtils.addMonthsToDate(pathView.currentItem.firstDayOfMonth, 1))
    }
    
    /**
     * @brief
     */
    function previousDate()
    {
        setToDate(DateUtils.addMonthsToDate(pathView.currentItem.firstDayOfMonth, -1))
    }
    
    /**
     * @brief
     */
    function addMonthsToDate(date, days)
    {
        return DateUtils.addMonthsToDate(date, days)
    }
    
    /**
     * @brief
     */
    function setToDate(date, isInitialMonth = true)
    {
        control.initialMonth = isInitialMonth;
        let monthDiff = date.getMonth() - pathView.currentItem.firstDayOfMonth.getMonth() + (12 * (date.getFullYear() - pathView.currentItem.firstDayOfMonth.getFullYear()))
        let newIndex = pathView.currentIndex + monthDiff;
        
        let firstItemDate = pathView.model.data(pathView.model.index(1,0), Kalendar.InfiniteCalendarViewModel.FirstDayOfMonthRole);
        let lastItemDate = pathView.model.data(pathView.model.index(pathView.model.rowCount() - 1,0), Kalendar.InfiniteCalendarViewModel.FirstDayOfMonthRole);
        
        while(firstItemDate >= date) {
            pathView.model.addDates(false)
            firstItemDate = pathView.model.data(pathView.model.index(1,0), Kalendar.InfiniteCalendarViewModel.FirstDayOfMonthRole);
            newIndex = 0;
        }
        if(firstItemDate < date && newIndex === 0) {
            newIndex = date.getMonth() - firstItemDate.getMonth() + (12 * (date.getFullYear() - firstItemDate.getFullYear())) + 1;
        }
        
        while(lastItemDate <= date) {
            pathView.model.addDates(true)
            lastItemDate = pathView.model.data(pathView.model.index(pathView.model.rowCount() - 1,0), Kalendar.InfiniteCalendarViewModel.FirstDayOfMonthRole);
        }
        pathView.currentIndex = newIndex;
    }
}