filering on slow responsing time problem

[tommego]

First filtering operation is very slow, and then it was well for nex filtering, what caused this problem?

problem above:

1. I select A (matched 12 items) and then select E (matched thousands of items) on the language filtering options.it takes 2 seconds on 100k items model.
2. I select E (matched thousands of items) first, it takes hours of filtering, on a 100k items model. and after finished this filtering job, other options of filtering come faster with 2 seconds.
   Amazing but why?

[oKcerG]

Hello,
Can you list the roles of your source model and share the QML source code of your SortFilterProxyModel (so I can see how your filters/sorters/proxy roles are set up)?

[tommego]

UIPage.qml

import QtQuick 2.0
import SongDataParser 1.0
import SortFilterProxyModel 0.2
import QtQuick.Controls 2.5
import "./Delegates"

Item {
    property var laguages:["All", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "L", "M", "N"]
    property var abc: ["All", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"]
    property int currentLanguageIndex: 0
    property int currentAbcIndex: 0
    property int pageSize: 20
    property int pageCount: sortFilterModel.count % pageSize === 0 ? sortFilterModel.count / pageSize : Math.round(sortFilterModel.count / pageSize) + 1

    SongDataParser{
        id: songDataParser
        onDataLoaded: {
            for(var i in songDatas())
            {
                var elementData = songDatas()[i];
                songModel.append(elementData)
            }
        }
    }

    ListModel{
        id: songModel
    }

    SortFilterProxyModel{
        id: sortFilterModel
        sourceModel: songModel
        filters:[
            ValueFilter{
                roleName: "Language"
                value: laguages[currentLanguageIndex]
                enabled: currentLanguageIndex !== 0
            },
            RegExpFilter {
                roleName: "PYStr1"
                pattern: "^" + abc[currentAbcIndex] // 正则表达式匹配字符串
                caseSensitivity: Qt.CaseInsensitive
                enabled: currentAbcIndex !== 0
            }

        ]

        sorters: [
            StringSorter{
                id: aa
            }

        ]
        Component.onCompleted: {
//            sortFilterModel.
        }
    }

    Column{
        anchors.fill: parent
        spacing: 20

        Item{
            width: parent.width
            height: 40
            Row{
                anchors.verticalCenter: parent.verticalCenter
                spacing: 10
                x: 20
                Text{
                    anchors.verticalCenter: parent.verticalCenter
                    text: "Language: "
                }

                Repeater{
                    model: laguages
                    Rectangle{
                        width: 40
                        height: 30
                        radius: 3
                        color: currentLanguageIndex == index ? "#3af" : "#aaa"
                        Text{
                            anchors.centerIn: parent
                            text: modelData
                            color: "white"
                        }
                        MouseArea{
                            anchors.fill: parent
                            onClicked: {
                                currentLanguageIndex = index
                            }
                        }
                    }
                }
            }
        }

        Item{
            width: parent.width
            height: 40
            Row{
                anchors.verticalCenter: parent.verticalCenter
                spacing: 10
                x: 20
                Text{
                    anchors.verticalCenter: parent.verticalCenter
                    text: "abc: "
                }

                Repeater{
                    model: abc
                    Rectangle{
                        width: 40
                        height: 30
                        radius: 3
                        color: currentAbcIndex == index ? "#3af" : "#aaa"
                        Text{
                            anchors.centerIn: parent
                            text: modelData
                            color: "white"
                        }
                        MouseArea{
                            anchors.fill: parent
                            onClicked: {
                                currentAbcIndex = index
                            }
                        }
                    }
                }
            }
        }

        Item{
            width: parent.width
            height: 500
            Column{
                anchors.fill: parent
                ListView{
                    id:listView
                    orientation: ListView.Horizontal
                    width: parent.width
                    height: parent.height - 60
                    model: pageCount
                    highlightRangeMode : ListView.StrictlyEnforceRange
                    highlightMoveDuration: 200
                    highlightMoveVelocity: -1
                    snapMode: ListView.SnapOneItem
                    delegate: PageDelegate{
                        pageNo: index
                        source: sortFilterModel
                        sizeInPage: pageSize
                        width: listView.width
                        height: listView.height
                    }
                }

                Item{
                    width: parent.width
                    height: 60
                    Row{
                        anchors.centerIn: parent
                        spacing: 20

                        Button{
                            text: "Previous"
                            width: 70
                            height: 40
                            onClicked: {
                                if(listView.currentIndex > 0)
                                    listView.currentIndex -= 1
                            }
                        }

                        Text{
                            text: String(listView.currentIndex + 1) + "/" + String(pageCount)
                            anchors.verticalCenter: parent.verticalCenter
                        }

                        Button{
                            text: "Next"
                            width: 70
                            height: 40
                            onClicked: {
                                if(listView.currentIndex < pageCount - 1)
                                    listView.currentIndex += 1
                            }
                        }
                    }
                }
            }
        }
    }

    Component.onCompleted: {
        songDataParser.loadData("E:/MiniK/Bin/KVData/swsong.db", 1000);
    }
}

PageDelegate.qml

import QtQuick 2.0
import PageModel 1.0

Rectangle{
    property int pageNo;
    property QtObject source;
    property int sizeInPage;
    id: page
    Grid{
        anchors.centerIn: parent
        spacing: 10
        columns: 5
        Repeater{
            model: PageModel{
                sourceModel: source
                pageIndex: pageNo
                pageSize: sizeInPage
            }
            delegate: SongDelegate{}
        }
    }
}

SongDelegate.qml

import QtQuick 2.0

Rectangle{
    width: 200
    height: 100
    border.width: 1
    border.color: "#7799aa"
    color: "#aaeeff"
    radius: 4
    Column{
        anchors.centerIn: parent
        spacing: 10
        Text{
            text: Name
        }
        Text{
            text: PYStr1
        }
        Text{
            text: Language
        }
    }
}

And the PageModel c++ implementation can read my articl open link(containing whole source code).

[tommego]

Hello, is this problem continuing solving?