Qt Reference Documentation

- Qt 4.8
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# itemCreation.js Example File

declarative/toys/dynamicscene/qml/dynamicscene/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.x + draggedItem.width > toolbox.x) { //Don't drop it in the toolbox
             draggedItem.destroy();
             draggedItem = null;
         } else {
             draggedItem.created = true;
             draggedItem = null;
         }
     }