1 var itemComponent = null;

     2 var draggedItem = null;

     3 var startingMouse;

     4 var posnInWindow;

     5 

     6 function startDrag(mouse)

     7 {

     8     posnInWindow = paletteItem.mapToItem(window, 0, 0);

     9     startingMouse = { x: mouse.x, y: mouse.y }

    10     loadComponent();

    11 }

    12 

    13 //Creation is split into two functions due to an asynchronous wait while

    14 //possible external files are loaded.

    15 

    16 function loadComponent() {

    17     if (itemComponent != null) { // component has been previously loaded

    18         createItem();

    19         return;

    20     }

    21 

    22     itemComponent = Qt.createComponent(paletteItem.componentFile);

    23     if (itemComponent.status == Component.Loading)  //Depending on the content, it can be ready or error immediately

    24         component.statusChanged.connect(createItem);

    25     else    

    26         createItem();

    27 }

    28 

    29 function createItem() {

    30     if (itemComponent.status == Component.Ready && draggedItem == null) {

    31         draggedItem = itemComponent.createObject(window);

    32         draggedItem.image = paletteItem.image;

    33         draggedItem.x = posnInWindow.x;

    34         draggedItem.y = posnInWindow.y;

    35         draggedItem.z = 3;  // make sure created item is above the ground layer

    36     } else if (itemComponent.status == Component.Error) {

    37         draggedItem = null;

    38         console.log("error creating component");

    39         console.log(itemComponent.errorString());

    40     }

    41 }

    42 

    43 function continueDrag(mouse)

    44 {

    45     if (draggedItem == null)

    46         return;

    47 

    48     draggedItem.x = mouse.x + posnInWindow.x - startingMouse.x;

    49     draggedItem.y = mouse.y + posnInWindow.y - startingMouse.y;

    50 }

    51 

    52 function endDrag(mouse)

    53 {

    54     if (draggedItem == null)

    55         return;

    56 

    57     if (draggedItem.x + draggedItem.width > toolbox.x) { //Don't drop it in the toolbox

    58         draggedItem.destroy();

    59         draggedItem = null;

    60     } else {

    61         draggedItem.created = true;

    62         draggedItem = null;

    63     }

    64 }

    65