itemCreation.js Example File

dynamicscene/content/itemCreation.js
var itemComponent = null;
var draggedItem = null;
var startingMouse;
var posnInWindow;

function startDrag(mouse)
{
    posnInWindow = paletteItem.mapToItem(window, 0, 0);
    startingMouse = { x: mouse.x, y: mouse.y }
    loadComponent();
}

//Creation is split into two functions due to an asynchronous wait while
//possible external files are loaded.

function loadComponent() {
    if (itemComponent != null) { // component has been previously loaded
        createItem();
        return;
    }

    itemComponent = Qt.createComponent(paletteItem.componentFile);
    if (itemComponent.status == Component.Loading)  //Depending on the content, it can be ready or error immediately
        component.statusChanged.connect(createItem);
    else
        createItem();
}

function createItem() {
    if (itemComponent.status == Component.Ready && draggedItem == null) {
        draggedItem = itemComponent.createObject(window, {"image": paletteItem.image, "x": posnInWindow.x, "y": posnInWindow.y, "z": 3});
        // make sure created item is above the ground layer
    } else if (itemComponent.status == Component.Error) {
        draggedItem = null;
        console.log("error creating component");
        console.log(itemComponent.errorString());
    }
}

function continueDrag(mouse)
{
    if (draggedItem == null)
        return;

    draggedItem.x = mouse.x + posnInWindow.x - startingMouse.x;
    draggedItem.y = mouse.y + posnInWindow.y - startingMouse.y;
}

function endDrag(mouse)
{
    if (draggedItem == null)
        return;

    if (draggedItem.y < toolbox.height) { //Don't drop it in the toolbox
        draggedItem.destroy();
        draggedItem = null;
    } else {
        draggedItem.created = true;
        draggedItem = null;
    }
}

© 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.