DropZone3.html
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<!DOCTYPE html>
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<title>The source code</title>
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<pre class="prettyprint lang-js"><span id='Ext-view-DropZone'>/**
</span> * @private
*/
Ext.define('Ext.view.DropZone', {
extend: 'Ext.dd.DropZone',
indicatorHtml: '<div class="' + Ext.baseCSSPrefix + 'grid-drop-indicator-left"></div><div class="' + Ext.baseCSSPrefix + 'grid-drop-indicator-right"></div>',
indicatorCls: Ext.baseCSSPrefix + 'grid-drop-indicator',
constructor: function(config) {
var me = this;
Ext.apply(me, config);
// Create a ddGroup unless one has been configured.
// User configuration of ddGroups allows users to specify which
// DD instances can interact with each other. Using one
// based on the id of the View would isolate it and mean it can only
// interact with a DragZone on the same View also using a generated ID.
if (!me.ddGroup) {
me.ddGroup = 'view-dd-zone-' + me.view.id;
}
// The DropZone's encapsulating element is the View's main element. It must be this because drop gestures
// may require scrolling on hover near a scrolling boundary. In Ext 4.x two DD instances may not use the
// same element, so a DragZone on this same View must use the View's parent element as its element.
me.callParent([me.view.el]);
},
// Fire an event through the client DataView. Lock this DropZone during the event processing so that
// its data does not become corrupted by processing mouse events.
fireViewEvent: function() {
var me = this,
result;
me.lock();
result = me.view.fireEvent.apply(me.view, arguments);
me.unlock();
return result;
},
getTargetFromEvent : function(e) {
var node = e.getTarget(this.view.getItemSelector()),
mouseY, nodeList, testNode, i, len, box;
// Not over a row node: The content may be narrower than the View's encapsulating element, so return the closest.
// If we fall through because the mouse is below the nodes (or there are no nodes), we'll get an onContainerOver call.
if (!node) {
mouseY = e.getPageY();
for (i = 0, nodeList = this.view.getNodes(), len = nodeList.length; i < len; i++) {
testNode = nodeList[i];
box = Ext.fly(testNode).getBox();
if (mouseY <= box.bottom) {
return testNode;
}
}
}
return node;
},
getIndicator: function() {
var me = this;
if (!me.indicator) {
me.indicator = new Ext.Component({
html: me.indicatorHtml,
cls: me.indicatorCls,
ownerCt: me.view,
floating: true,
shadow: false
});
}
return me.indicator;
},
getPosition: function(e, node) {
var y = e.getXY()[1],
region = Ext.fly(node).getRegion(),
pos;
if ((region.bottom - y) >= (region.bottom - region.top) / 2) {
pos = "before";
} else {
pos = "after";
}
return pos;
},
<span id='Ext-view-DropZone-method-containsRecordAtOffset'> /**
</span> * @private Determines whether the record at the specified offset from the passed record
* is in the drag payload.
* @param records
* @param record
* @param offset
* @returns {Boolean} True if the targeted record is in the drag payload
*/
containsRecordAtOffset: function(records, record, offset) {
if (!record) {
return false;
}
var view = this.view,
recordIndex = view.indexOf(record),
nodeBefore = view.getNode(recordIndex + offset),
recordBefore = nodeBefore ? view.getRecord(nodeBefore) : null;
return recordBefore && Ext.Array.contains(records, recordBefore);
},
positionIndicator: function(node, data, e) {
var me = this,
view = me.view,
pos = me.getPosition(e, node),
overRecord = view.getRecord(node),
draggingRecords = data.records,
indicatorY;
if (!Ext.Array.contains(draggingRecords, overRecord) && (
pos == 'before' && !me.containsRecordAtOffset(draggingRecords, overRecord, -1) ||
pos == 'after' && !me.containsRecordAtOffset(draggingRecords, overRecord, 1)
)) {
me.valid = true;
if (me.overRecord != overRecord || me.currentPosition != pos) {
indicatorY = Ext.fly(node).getY() - view.el.getY() - 1;
if (pos == 'after') {
indicatorY += Ext.fly(node).getHeight();
}
me.getIndicator().setWidth(Ext.fly(view.el).getWidth()).showAt(0, indicatorY);
// Cache the overRecord and the 'before' or 'after' indicator.
me.overRecord = overRecord;
me.currentPosition = pos;
}
} else {
me.invalidateDrop();
}
},
invalidateDrop: function() {
if (this.valid) {
this.valid = false;
this.getIndicator().hide();
}
},
// The mouse is over a View node
onNodeOver: function(node, dragZone, e, data) {
var me = this;
if (!Ext.Array.contains(data.records, me.view.getRecord(node))) {
me.positionIndicator(node, data, e);
}
return me.valid ? me.dropAllowed : me.dropNotAllowed;
},
// Moved out of the DropZone without dropping.
// Remove drop position indicator
notifyOut: function(node, dragZone, e, data) {
var me = this;
me.callParent(arguments);
delete me.overRecord;
delete me.currentPosition;
if (me.indicator) {
me.indicator.hide();
}
},
// The mouse is past the end of all nodes (or there are no nodes)
onContainerOver : function(dd, e, data) {
var me = this,
view = me.view,
count = view.store.getCount();
// There are records, so position after the last one
if (count) {
me.positionIndicator(view.getNode(count - 1), data, e);
}
// No records, position the indicator at the top
else {
delete me.overRecord;
delete me.currentPosition;
me.getIndicator().setWidth(Ext.fly(view.el).getWidth()).showAt(0, 0);
me.valid = true;
}
return me.dropAllowed;
},
onContainerDrop : function(dd, e, data) {
return this.onNodeDrop(dd, null, e, data);
},
onNodeDrop: function(node, dragZone, e, data) {
var me = this,
dropHandled = false,
// Create a closure to perform the operation which the event handler may use.
// Users may now set the wait parameter in the beforedrop handler, and perform any kind
// of asynchronous processing such as an Ext.Msg.confirm, or an Ajax request,
// and complete the drop gesture at some point in the future by calling either the
// processDrop or cancelDrop methods.
dropHandlers = {
wait: false,
processDrop: function () {
me.invalidateDrop();
me.handleNodeDrop(data, me.overRecord, me.currentPosition);
dropHandled = true;
me.fireViewEvent('drop', node, data, me.overRecord, me.currentPosition);
},
cancelDrop: function() {
me.invalidateDrop();
dropHandled = true;
}
},
performOperation = false;
if (me.valid) {
performOperation = me.fireViewEvent('beforedrop', node, data, me.overRecord, me.currentPosition, dropHandlers);
if (dropHandlers.wait) {
return;
}
if (performOperation !== false) {
// If either of the drop handlers were called in the event handler, do not do it again.
if (!dropHandled) {
dropHandlers.processDrop();
}
}
}
return performOperation;
},
destroy: function(){
Ext.destroy(this.indicator);
delete this.indicator;
this.callParent();
}
});
</pre>
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