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import QtQuick 2.9
import QtQuick.Controls 2.3
import QtQuick.Layouts 1.2
import im.nheko 1.0

Popup {
    id: popup

    property int currentIndex: -1
    property string completerName
    property var completer
    property bool bottomToTop: true
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    signal completionClicked(string completion)

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    function up() {
        if (bottomToTop)
            down_();
        else
            up_();
    }

    function down() {
        if (bottomToTop)
            up_();
        else
            down_();
    }

    function up_() {
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        currentIndex = currentIndex - 1;
        if (currentIndex == -2)
            currentIndex = listView.count - 1;
    function down_() {
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        currentIndex = currentIndex + 1;
        if (currentIndex >= listView.count)
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            currentIndex = -1;

    }

    function currentCompletion() {
        if (currentIndex > -1 && currentIndex < listView.count)
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            return completer.completionAt(currentIndex);
        else
            return null;
    }

    onCompleterNameChanged: {
        if (completerName) {
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            completer = TimelineManager.timeline.input.completerFor(completerName);
            completer.setSearchString("");
        } else {
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            completer = undefined;
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    }
    padding: 0
    onAboutToShow: currentIndex = -1
    height: listView.contentHeight
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    Connections {
        onTimelineChanged: completer = null
        target: TimelineManager
    }

    ListView {
        id: listView
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        anchors.fill: parent
        implicitWidth: contentItem.childrenRect.width
        model: completer
        verticalLayoutDirection: popup.bottomToTop ? ListView.BottomToTop : ListView.TopToBottom
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        delegate: Rectangle {
            color: model.index == popup.currentIndex ? colors.highlight : colors.base
            height: chooser.childrenRect.height + 4
            implicitWidth: chooser.childrenRect.width + 4
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            MouseArea {
                anchors.fill: parent
                hoverEnabled: true
                onEntered: popup.currentIndex = model.index
                onClicked: popup.completionClicked(completer.completionAt(model.index))
            }

            DelegateChooser {
                id: chooser
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                roleValue: popup.completerName
                anchors.centerIn: parent
                DelegateChoice {
                    roleValue: "user"
                    RowLayout {
                        id: del
                        anchors.centerIn: parent
                        Avatar {
                            height: 24
                            width: 24
                            displayName: model.displayName
                            url: model.avatarUrl.replace("mxc://", "image://MxcImage/")
                        }
                        Label {
                            text: model.displayName
                            color: model.index == popup.currentIndex ? colors.highlightedText : colors.text
                DelegateChoice {
                    roleValue: "emoji"
                    RowLayout {
                        id: del
                        anchors.centerIn: parent
                        Label {
                            text: model.unicode
                            color: model.index == popup.currentIndex ? colors.highlightedText : colors.text
                            font: Settings.emojiFont
                        }
                        Label {
                            text: model.shortName
                            color: model.index == popup.currentIndex ? colors.highlightedText : colors.text
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                    }

                }

            }

        }

    }

    enter: Transition {
        NumberAnimation {
            property: "opacity"
            from: 0
            to: 1
            duration: 100
        }

    }

    exit: Transition {
        NumberAnimation {
            property: "opacity"
            from: 1
            to: 0
            duration: 100
        }

    }

    background: Rectangle {
        color: colors.base
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        implicitHeight: popup.contentHeight
        implicitWidth: popup.contentWidth
    }

}