PresentingStackView.qml

import QtQuick 2.10
import QtQuick.Controls 2.3

StackView {
    id: _presenterStack

    property int animDuration: 150
    property int opDuration: 75

    property var _clearItems: []

    function presentItem(item) {
        if(typeof item.presentAsRoot == "boolean" && item.presentAsRoot) {
            if(safeReplace(null, item))
                return true;
            else
                return false;
        } else {
            if(push(item))
                return true;
            else
                return false;
        }
    }

    function closeAction() {
        if(_presenterStack.currentItem &&
           typeof _presenterStack.currentItem.closeAction == "function") {
            if(_presenterStack.currentItem.closeAction())
                return true;
        }

        if(_presenterStack.safePop())
            return true;
        else
            return false;
    }

    function safePop(item, operation) {
        var resItem = pop(item, operation)
        if(resItem) {
            _clearItems.push(resItem);
            return true;
        } else
            return false;
    }

    function safeReplace(target, item, properties, operation) {
        var items = [];
        for(var i = depth -1; i >= 0; i--) {
            var cItem = get(i, StackView.ForceLoad);
            _clearItems.push(cItem);
            if(cItem === target)
                break;
        }
        if(replace(target, item, properties, operation))
            return true;
        else
            return false;
    }

    function clearWaitingItems() {
        _clearItems.forEach(function(item) {
            if(typeof item.afterPop == "function")
                item.afterPop();
            item.destroy();
        });
        _clearItems = [];
    }

    pushEnter: Transition {
        PropertyAnimation {
            property: "y"
            easing.type: Easing.InOutQuad
            from: height * 0.3
            to: 0
            duration: _presenterStack.animDuration
        }
        PropertyAnimation {
            property: "opacity"
            from: 0.0
            to: 1.0
            duration: _presenterStack.opDuration
        }
    }
    pushExit: Transition {
        PauseAnimation {
            duration: _presenterStack.animDuration
        }

        onRunningChanged: {
            if(!running)
                Qt.callLater(clearWaitingItems)
        }
    }
    popEnter: Transition {
        PauseAnimation {
            duration: _presenterStack.animDuration
        }
    }
    popExit: Transition {
        PropertyAnimation {
            property: "y"
            easing.type: Easing.InOutQuad
            from: 0
            to: height * 0.3
            duration: _presenterStack.animDuration
        }
        SequentialAnimation {
            PauseAnimation {
                duration: _presenterStack.animDuration - _presenterStack.opDuration
            }
            PropertyAnimation {
                id: pp1
                property: "opacity"
                from: 1.0
                to: 0.0
                duration: _presenterStack.opDuration
            }
        }

        onRunningChanged: {
            if(!running)
                Qt.callLater(clearWaitingItems)
        }
    }
    replaceEnter: pushEnter
    replaceExit: pushExit
}