/**
* Extends the dd-ddm-base Class to add support for the viewport shim to allow a draggable
* anode to drag to be dragged over an iframe or any other node that traps mousemove events.
* It is also required to have Drop Targets enabled, as the viewport shim will contain the shims for the Drop Targets.
* @module dd
* @submodule dd-ddm
* @for DDM
* @namespace DD
*/
Y.mix(Y.DD.DDM, {
/**
* The shim placed over the screen to track the mousemove event.
* @private
* @property _pg
* @type {Node}
*/
_pg: null,
/**
* Set this to true to set the shims opacity to .5 for debugging it, default: false.
* @private
* @property _debugShim
* @type {Boolean}
*/
_debugShim: false,
_activateTargets: function() { },
_deactivateTargets: function() {},
_startDrag: function() {
if (this.activeDrag && this.activeDrag.get('useShim')) {
this._shimming = true;
this._pg_activate();
this._activateTargets();
}
},
_endDrag: function() {
this._pg_deactivate();
this._deactivateTargets();
},
/**
* Deactivates the shim
* @private
* @method _pg_deactivate
*/
_pg_deactivate: function() {
this._pg.setStyle('display', 'none');
},
/**
* Activates the shim
* @private
* @method _pg_activate
*/
_pg_activate: function() {
if (!this._pg) {
this._createPG();
}
var ah = this.activeDrag.get('activeHandle'), cur = 'auto';
if (ah) {
cur = ah.getStyle('cursor');
}
if (cur === 'auto') {
cur = this.get('dragCursor');
}
this._pg_size();
this._pg.setStyles({
top: 0,
left: 0,
display: 'block',
opacity: ((this._debugShim) ? '.5' : '0'),
cursor: cur
});
},
/**
* Sizes the shim on: activatation, window:scroll, window:resize
* @private
* @method _pg_size
*/
_pg_size: function() {
if (this.activeDrag) {
var b = Y.one('body'),
h = b.get('docHeight'),
w = b.get('docWidth');
this._pg.setStyles({
height: h + 'px',
width: w + 'px'
});
}
},
/**
* Creates the shim and adds it's listeners to it.
* @private
* @method _createPG
*/
_createPG: function() {
var pg = Y.Node.create('<div></div>'),
bd = Y.one('body'), win;
pg.setStyles({
top: '0',
left: '0',
position: 'absolute',
zIndex: '9999',
overflow: 'hidden',
backgroundColor: 'red',
display: 'none',
height: '5px',
width: '5px'
});
pg.set('id', Y.stamp(pg));
pg.addClass(Y.DD.DDM.CSS_PREFIX + '-shim');
bd.prepend(pg);
this._pg = pg;
this._pg.on('mousemove', Y.throttle(Y.bind(this._move, this), this.get('throttleTime')));
this._pg.on('mouseup', Y.bind(this._end, this));
win = Y.one('win');
Y.on('window:resize', Y.bind(this._pg_size, this));
win.on('scroll', Y.bind(this._pg_size, this));
}
}, true);