',
+ margins: '5 5 5 5'
+ }, {
+ title: 'Patients',
+ region: 'west',
+ width: 300,
+ margins: '0 5 5 5',
+ items: patientView
+ }, hospitalGrid ]
+ });
+});
+
+/*
+ * Here is where we "activate" the DataView.
+ * We have decided that each node with the class "patient-source" encapsulates a single draggable
+ * object.
+ *
+ * So we inject code into the DragZone which, when passed a mousedown event, interrogates
+ * the event to see if it was within an element with the class "patient-source". If so, we
+ * return non-null drag data.
+ *
+ * Returning non-null drag data indicates that the mousedown event has begun a dragging process.
+ * The data must contain a property called "ddel" which is a DOM element which provides an image
+ * of the data being dragged. The actual node clicked on is not dragged, a proxy element is dragged.
+ * We can insert any other data into the data object, and this will be used by a cooperating DropZone
+ * to perform the drop operation.
+ */
+function initializePatientDragZone(v) {
+ v.dragZone = new Ext.dd.DragZone(v.getEl(), {
+
+// On receipt of a mousedown event, see if it is within a draggable element.
+// Return a drag data object if so. The data object can contain arbitrary application
+// data, but it should also contain a DOM element in the ddel property to provide
+// a proxy to drag.
+ getDragData: function(e) {
+ var sourceEl = e.getTarget(v.itemSelector, 10);
+ if (sourceEl) {
+ d = sourceEl.cloneNode(true);
+ d.id = Ext.id();
+ return v.dragData = {
+ sourceEl: sourceEl,
+ repairXY: Ext.fly(sourceEl).getXY(),
+ ddel: d,
+ patientData: v.getRecord(sourceEl).data
+ }
+ }
+ },
+
+// Provide coordinates for the proxy to slide back to on failed drag.
+// This is the original XY coordinates of the draggable element.
+ getRepairXY: function() {
+ return this.dragData.repairXY;
+ }
+ });
+}
+
+/*
+ * Here is where we "activate" the GridPanel.
+ * We have decided that the element with class "hospital-target" is the element which can receieve
+ * drop gestures. So we inject a method "getTargetFromEvent" into the DropZone. This is constantly called
+ * while the mouse is moving over the DropZone, and it returns the target DOM element if it detects that
+ * the mouse if over an element which can receieve drop gestures.
+ *
+ * Once the DropZone has been informed by getTargetFromEvent that it is over a target, it will then
+ * call several "onNodeXXXX" methods at various points. These include:
+ *
+ * onNodeEnter
+ * onNodeOut
+ * onNodeOver
+ * onNodeDrop
+ *
+ * We provide implementations of each of these to provide behaviour for these events.
+ */
+function initializeHospitalDropZone(g) {
+ g.dropZone = new Ext.dd.DropZone(g.getView().scroller, {
+
+// If the mouse is over a target node, return that node. This is
+// provided as the "target" parameter in all "onNodeXXXX" node event handling functions
+ getTargetFromEvent: function(e) {
+ return e.getTarget('.hospital-target');
+ },
+
+// On entry into a target node, highlight that node.
+ onNodeEnter : function(target, dd, e, data){
+ Ext.fly(target).addClass('hospital-target-hover');
+ },
+
+// On exit from a target node, unhighlight that node.
+ onNodeOut : function(target, dd, e, data){
+ Ext.fly(target).removeClass('hospital-target-hover');
+ },
+
+// While over a target node, return the default drop allowed class which
+// places a "tick" icon into the drag proxy.
+ onNodeOver : function(target, dd, e, data){
+ return Ext.dd.DropZone.prototype.dropAllowed;
+ },
+
+// On node drop, we can interrogate the target node to find the underlying
+// application object that is the real target of the dragged data.
+// In this case, it is a Record in the GridPanel's Store.
+// We can use the data set up by the DragZone's getDragData method to read
+// any data we decided to attach.
+ onNodeDrop : function(target, dd, e, data){
+ var rowIndex = g.getView().findRowIndex(target);
+ var h = g.getStore().getAt(rowIndex);
+ Ext.Msg.alert('Drop gesture', 'Dropped patient ' + data.patientData.name +
+ ' on hospital ' + h.data.name);
+ return true;
+ }
+ });
+}