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/**
* Base class from Ext.ux.TabReorderer.
*/
Ext.define('Ext.ux.BoxReorderer', {
requires: [
'Ext.dd.DD'
],
mixins: {
observable: 'Ext.util.Observable'
},
/**
* @cfg {String} itemSelector
* A {@link Ext.DomQuery DomQuery} selector which identifies the encapsulating elements of child
* Components which participate in reordering.
*/
itemSelector: '.x-box-item',
/**
* @cfg {Mixed} animate
* If truthy, child reordering is animated so that moved boxes slide smoothly into position.
* If this option is numeric, it is used as the animation duration in milliseconds.
*/
animate: 100,
constructor: function() {
this.addEvents(
/**
* @event StartDrag
* Fires when dragging of a child Component begins.
* @param {Ext.ux.BoxReorderer} this
* @param {Ext.container.Container} container The owning Container
* @param {Ext.Component} dragCmp The Component being dragged
* @param {Number} idx The start index of the Component being dragged.
*/
'StartDrag',
/**
* @event Drag
* Fires during dragging of a child Component.
* @param {Ext.ux.BoxReorderer} this
* @param {Ext.container.Container} container The owning Container
* @param {Ext.Component} dragCmp The Component being dragged
* @param {Number} startIdx The index position from which the Component was initially dragged.
* @param {Number} idx The current closest index to which the Component would drop.
*/
'Drag',
/**
* @event ChangeIndex
* Fires when dragging of a child Component causes its drop index to change.
* @param {Ext.ux.BoxReorderer} this
* @param {Ext.container.Container} container The owning Container
* @param {Ext.Component} dragCmp The Component being dragged
* @param {Number} startIdx The index position from which the Component was initially dragged.
* @param {Number} idx The current closest index to which the Component would drop.
*/
'ChangeIndex',
/**
* @event Drop
* Fires when a child Component is dropped at a new index position.
* @param {Ext.ux.BoxReorderer} this
* @param {Ext.container.Container} container The owning Container
* @param {Ext.Component} dragCmp The Component being dropped
* @param {Number} startIdx The index position from which the Component was initially dragged.
* @param {Number} idx The index at which the Component is being dropped.
*/
'Drop'
);
this.mixins.observable.constructor.apply(this, arguments);
},
init: function(container) {
var me = this;
me.container = container;
// Set our animatePolicy to animate the start position (ie x for HBox, y for VBox)
me.animatePolicy = {};
me.animatePolicy[container.getLayout().names.x] = true;
// Initialize the DD on first layout, when the innerCt has been created.
me.container.on({
scope: me,
boxready: me.onBoxReady,
beforedestroy: me.onContainerDestroy
});
},
/**
* @private Clear up on Container destroy
*/
onContainerDestroy: function() {
var dd = this.dd;
if (dd) {
dd.unreg();
this.dd = null;
}
},
onBoxReady: function() {
var me = this,
layout = me.container.getLayout(),
names = layout.names,
dd;
// Create a DD instance. Poke the handlers in.
// TODO: Ext5's DD classes should apply config to themselves.
// TODO: Ext5's DD classes should not use init internally because it collides with use as a plugin
// TODO: Ext5's DD classes should be Observable.
// TODO: When all the above are true, this plugin should extend the DD class.
dd = me.dd = Ext.create('Ext.dd.DD', layout.innerCt, me.container.id + '-reorderer');
Ext.apply(dd, {
animate: me.animate,
reorderer: me,
container: me.container,
getDragCmp: me.getDragCmp,
clickValidator: Ext.Function.createInterceptor(dd.clickValidator, me.clickValidator, me, false),
onMouseDown: me.onMouseDown,
startDrag: me.startDrag,
onDrag: me.onDrag,
endDrag: me.endDrag,
getNewIndex: me.getNewIndex,
doSwap: me.doSwap,
findReorderable: me.findReorderable
});
// Decide which dimension we are measuring, and which measurement metric defines
// the *start* of the box depending upon orientation.
dd.dim = names.width;
dd.startAttr = names.beforeX;
dd.endAttr = names.afterX;
},
getDragCmp: function(e) {
return this.container.getChildByElement(e.getTarget(this.itemSelector, 10));
},
// check if the clicked component is reorderable
clickValidator: function(e) {
var cmp = this.getDragCmp(e);
// If cmp is null, this expression MUST be coerced to boolean so that createInterceptor is able to test it against false
return !!(cmp && cmp.reorderable !== false);
},
onMouseDown: function(e) {
var me = this,
container = me.container,
containerBox,
cmpEl,
cmpBox;
// Ascertain which child Component is being mousedowned
me.dragCmp = me.getDragCmp(e);
if (me.dragCmp) {
cmpEl = me.dragCmp.getEl();
me.startIndex = me.curIndex = container.items.indexOf(me.dragCmp);
// Start position of dragged Component
cmpBox = cmpEl.getBox();
// Last tracked start position
me.lastPos = cmpBox[this.startAttr];
// Calculate constraints depending upon orientation
// Calculate offset from mouse to dragEl position
containerBox = container.el.getBox();
if (me.dim === 'width') {
me.minX = containerBox.left;
me.maxX = containerBox.right - cmpBox.width;
me.minY = me.maxY = cmpBox.top;
me.deltaX = e.getPageX() - cmpBox.left;
} else {
me.minY = containerBox.top;
me.maxY = containerBox.bottom - cmpBox.height;
me.minX = me.maxX = cmpBox.left;
me.deltaY = e.getPageY() - cmpBox.top;
}
me.constrainY = me.constrainX = true;
}
},
startDrag: function() {
var me = this,
dragCmp = me.dragCmp;
if (dragCmp) {
// For the entire duration of dragging the *Element*, defeat any positioning and animation of the dragged *Component*
dragCmp.setPosition = Ext.emptyFn;
dragCmp.animate = false;
// Animate the BoxLayout just for the duration of the drag operation.
if (me.animate) {
me.container.getLayout().animatePolicy = me.reorderer.animatePolicy;
}
// We drag the Component element
me.dragElId = dragCmp.getEl().id;
me.reorderer.fireEvent('StartDrag', me, me.container, dragCmp, me.curIndex);
// Suspend events, and set the disabled flag so that the mousedown and mouseup events
// that are going to take place do not cause any other UI interaction.
dragCmp.suspendEvents();
dragCmp.disabled = true;
dragCmp.el.setStyle('zIndex', 100);
} else {
me.dragElId = null;
}
},
/**
* @private
* Find next or previous reorderable component index.
* @param {Number} newIndex The initial drop index.
* @return {Number} The index of the reorderable component.
*/
findReorderable: function(newIndex) {
var me = this,
items = me.container.items,
newItem;
if (items.getAt(newIndex).reorderable === false) {
newItem = items.getAt(newIndex);
if (newIndex > me.startIndex) {
while(newItem && newItem.reorderable === false) {
newIndex++;
newItem = items.getAt(newIndex);
}
} else {
while(newItem && newItem.reorderable === false) {
newIndex--;
newItem = items.getAt(newIndex);
}
}
}
newIndex = Math.min(Math.max(newIndex, 0), items.getCount() - 1);
if (items.getAt(newIndex).reorderable === false) {
return -1;
}
return newIndex;
},
/**
* @private
* Swap 2 components.
* @param {Number} newIndex The initial drop index.
*/
doSwap: function(newIndex) {
var me = this,
items = me.container.items,
container = me.container,
wasRoot = me.container._isLayoutRoot,
orig, dest, tmpIndex;
newIndex = me.findReorderable(newIndex);
if (newIndex === -1) {
return;
}
me.reorderer.fireEvent('ChangeIndex', me, container, me.dragCmp, me.startIndex, newIndex);
orig = items.getAt(me.curIndex);
dest = items.getAt(newIndex);
items.remove(orig);
tmpIndex = Math.min(Math.max(newIndex, 0), items.getCount() - 1);
items.insert(tmpIndex, orig);
items.remove(dest);
items.insert(me.curIndex, dest);
// Make the Box Container the topmost layout participant during the layout.
container._isLayoutRoot = true;
container.updateLayout();
container._isLayoutRoot = wasRoot;
me.curIndex = newIndex;
},
onDrag: function(e) {
var me = this,
newIndex;
newIndex = me.getNewIndex(e.getPoint());
if ((newIndex !== undefined)) {
me.reorderer.fireEvent('Drag', me, me.container, me.dragCmp, me.startIndex, me.curIndex);
me.doSwap(newIndex);
}
},
endDrag: function(e) {
if (e) {
e.stopEvent();
}
var me = this,
layout = me.container.getLayout(),
temp;
if (me.dragCmp) {
delete me.dragElId;
// Reinstate the Component's positioning method after mouseup, and allow the layout system to animate it.
delete me.dragCmp.setPosition;
me.dragCmp.animate = true;
// Ensure the lastBox is correct for the animation system to restore to when it creates the "from" animation frame
me.dragCmp.lastBox[layout.names.x] = me.dragCmp.getPosition(true)[layout.names.widthIndex];
// Make the Box Container the topmost layout participant during the layout.
me.container._isLayoutRoot = true;
me.container.updateLayout();
me.container._isLayoutRoot = undefined;
// Attempt to hook into the afteranimate event of the drag Component to call the cleanup
temp = Ext.fx.Manager.getFxQueue(me.dragCmp.el.id)[0];
if (temp) {
temp.on({
afteranimate: me.reorderer.afterBoxReflow,
scope: me
});
}
// If not animated, clean up after the mouseup has happened so that we don't click the thing being dragged
else {
Ext.Function.defer(me.reorderer.afterBoxReflow, 1, me);
}
if (me.animate) {
delete layout.animatePolicy;
}
me.reorderer.fireEvent('drop', me, me.container, me.dragCmp, me.startIndex, me.curIndex);
}
},
/**
* @private
* Called after the boxes have been reflowed after the drop.
* Re-enabled the dragged Component.
*/
afterBoxReflow: function() {
var me = this;
me.dragCmp.el.setStyle('zIndex', '');
me.dragCmp.disabled = false;
me.dragCmp.resumeEvents();
},
/**
* @private
* Calculate drop index based upon the dragEl's position.
*/
getNewIndex: function(pointerPos) {
var me = this,
dragEl = me.getDragEl(),
dragBox = Ext.fly(dragEl).getBox(),
targetEl,
targetBox,
targetMidpoint,
i = 0,
it = me.container.items.items,
ln = it.length,
lastPos = me.lastPos;
me.lastPos = dragBox[me.startAttr];
for (; i < ln; i++) {
targetEl = it[i].getEl();
// Only look for a drop point if this found item is an item according to our selector
if (targetEl.is(me.reorderer.itemSelector)) {
targetBox = targetEl.getBox();
targetMidpoint = targetBox[me.startAttr] + (targetBox[me.dim] >> 1);
if (i < me.curIndex) {
if ((dragBox[me.startAttr] < lastPos) && (dragBox[me.startAttr] < (targetMidpoint - 5))) {
return i;
}
} else if (i > me.curIndex) {
if ((dragBox[me.startAttr] > lastPos) && (dragBox[me.endAttr] > (targetMidpoint + 5))) {
return i;
}
}
}
}
}
});
