/** * @class Ext.dd.DragTracker * A DragTracker listens for drag events on an Element and fires events at the start and end of the drag, * as well as during the drag. This is useful for components such as {@link Ext.slider.Multi}, where there is * an element that can be dragged around to change the Slider's value. * DragTracker provides a series of template methods that should be overridden to provide functionality * in response to detected drag operations. These are onBeforeStart, onStart, onDrag and onEnd. * See {@link Ext.slider.Multi}'s initEvents function for an example implementation. */ Ext.define('Ext.dd.DragTracker', { uses: ['Ext.util.Region'], mixins: { observable: 'Ext.util.Observable' }, /** * @property active * @type Boolean * Read-only property indicated whether the user is currently dragging this * tracker. */ active: false, /** * @property dragTarget * @type HtmlElement * <p><b>Only valid during drag operations. Read-only.</b></p> * <p>The element being dragged.</p> * <p>If the {@link #delegate} option is used, this will be the delegate element which was mousedowned.</p> */ /** * @cfg {Boolean} trackOver * <p>Defaults to <code>false</code>. Set to true to fire mouseover and mouseout events when the mouse enters or leaves the target element.</p> * <p>This is implicitly set when an {@link #overCls} is specified.</p> * <b>If the {@link #delegate} option is used, these events fire only when a delegate element is entered of left.</b>. */ trackOver: false, /** * @cfg {String} overCls * <p>A CSS class to add to the DragTracker's target element when the element (or, if the {@link #delegate} option is used, * when a delegate element) is mouseovered.</p> * <b>If the {@link #delegate} option is used, these events fire only when a delegate element is entered of left.</b>. */ /** * @cfg {Ext.util.Region/Element} constrainTo * <p>A {@link Ext.util.Region Region} (Or an element from which a Region measurement will be read) which is used to constrain * the result of the {@link #getOffset} call.</p> * <p>This may be set any time during the DragTracker's lifecycle to set a dynamic constraining region.</p> */ /** * @cfg {Number} tolerance * Number of pixels the drag target must be moved before dragging is * considered to have started. Defaults to <code>5</code>. */ tolerance: 5, /** * @cfg {Boolean/Number} autoStart * Defaults to <code>false</code>. Specify <code>true</code> to defer trigger start by 1000 ms. * Specify a Number for the number of milliseconds to defer trigger start. */ autoStart: false, /** * @cfg {String} delegate * Optional. <p>A {@link Ext.DomQuery DomQuery} selector which identifies child elements within the DragTracker's encapsulating * Element which are the tracked elements. This limits tracking to only begin when the matching elements are mousedowned.</p> * <p>This may also be a specific child element within the DragTracker's encapsulating element to use as the tracked element.</p> */ /** * @cfg {Boolean} preventDefault * Specify <code>false</code> to enable default actions on onMouseDown events. Defaults to <code>true</code>. */ /** * @cfg {Boolean} stopEvent * Specify <code>true</code> to stop the <code>mousedown</code> event from bubbling to outer listeners from the target element (or its delegates). Defaults to <code>false</code>. */ constructor : function(config){ Ext.apply(this, config); this.addEvents( /** * @event mouseover <p><b>Only available when {@link #trackOver} is <code>true</code></b></p> * <p>Fires when the mouse enters the DragTracker's target element (or if {@link #delegate} is * used, when the mouse enters a delegate element).</p> * @param {Object} this * @param {Object} e event object * @param {HtmlElement} target The element mouseovered. */ 'mouseover', /** * @event mouseout <p><b>Only available when {@link #trackOver} is <code>true</code></b></p> * <p>Fires when the mouse exits the DragTracker's target element (or if {@link #delegate} is * used, when the mouse exits a delegate element).</p> * @param {Object} this * @param {Object} e event object */ 'mouseout', /** * @event mousedown <p>Fires when the mouse button is pressed down, but before a drag operation begins. The * drag operation begins after either the mouse has been moved by {@link #tolerance} pixels, or after * the {@link #autoStart} timer fires.</p> * <p>Return false to veto the drag operation.</p> * @param {Object} this * @param {Object} e event object */ 'mousedown', /** * @event mouseup * @param {Object} this * @param {Object} e event object */ 'mouseup', /** * @event mousemove Fired when the mouse is moved. Returning false cancels the drag operation. * @param {Object} this * @param {Object} e event object */ 'mousemove', /** * @event dragstart * @param {Object} this * @param {Object} e event object */ 'dragstart', /** * @event dragend * @param {Object} this * @param {Object} e event object */ 'dragend', /** * @event drag * @param {Object} this * @param {Object} e event object */ 'drag' ); this.dragRegion = Ext.create('Ext.util.Region', 0,0,0,0); if (this.el) { this.initEl(this.el); } // Dont pass the config so that it is not applied to 'this' again this.mixins.observable.constructor.call(this); if (this.disabled) { this.disable(); } }, /** * Initializes the DragTracker on a given element. * @param {Ext.core.Element/HTMLElement} el The element */ initEl: function(el) { this.el = Ext.get(el); // The delegate option may also be an element on which to listen this.handle = Ext.get(this.delegate); // If delegate specified an actual element to listen on, we do not use the delegate listener option this.delegate = this.handle ? undefined : this.delegate; if (!this.handle) { this.handle = this.el; } // Add a mousedown listener which reacts only on the elements targeted by the delegate config. // We process mousedown to begin tracking. this.mon(this.handle, { mousedown: this.onMouseDown, delegate: this.delegate, scope: this }); // If configured to do so, track mouse entry and exit into the target (or delegate). // The mouseover and mouseout CANNOT be replaced with mouseenter and mouseleave // because delegate cannot work with those pseudoevents. Entry/exit checking is done in the handler. if (this.trackOver || this.overCls) { this.mon(this.handle, { mouseover: this.onMouseOver, mouseout: this.onMouseOut, delegate: this.delegate, scope: this }); } }, disable: function() { this.disabled = true; }, enable: function() { this.disabled = false; }, destroy : function() { this.clearListeners(); delete this.el; }, // When the pointer enters a tracking element, fire a mouseover if the mouse entered from outside. // This is mouseenter functionality, but we cannot use mouseenter because we are using "delegate" to filter mouse targets onMouseOver: function(e, target) { var me = this; if (!me.disabled) { if (Ext.EventManager.contains(e) || me.delegate) { me.mouseIsOut = false; if (me.overCls) { me.el.addCls(me.overCls); } me.fireEvent('mouseover', me, e, me.delegate ? e.getTarget(me.delegate, target) : me.handle); } } }, // When the pointer exits a tracking element, fire a mouseout. // This is mouseleave functionality, but we cannot use mouseleave because we are using "delegate" to filter mouse targets onMouseOut: function(e) { if (this.mouseIsDown) { this.mouseIsOut = true; } else { if (this.overCls) { this.el.removeCls(this.overCls); } this.fireEvent('mouseout', this, e); } }, onMouseDown: function(e, target){ // If this is disabled, or the mousedown has been processed by an upstream DragTracker, return if (this.disabled ||e.dragTracked) { return; } // This information should be available in mousedown listener and onBeforeStart implementations this.dragTarget = this.delegate ? target : this.handle.dom; this.startXY = this.lastXY = e.getXY(); this.startRegion = Ext.fly(this.dragTarget).getRegion(); if (this.fireEvent('mousedown', this, e) !== false && this.onBeforeStart(e) !== false) { // Track when the mouse is down so that mouseouts while the mouse is down are not processed. // The onMouseOut method will only ever be called after mouseup. this.mouseIsDown = true; // Flag for downstream DragTracker instances that the mouse is being tracked. e.dragTracked = true; if (this.preventDefault !== false) { e.preventDefault(); } Ext.getDoc().on({ scope: this, mouseup: this.onMouseUp, mousemove: this.onMouseMove, selectstart: this.stopSelect }); if (this.autoStart) { this.timer = Ext.defer(this.triggerStart, this.autoStart === true ? 1000 : this.autoStart, this, [e]); } } }, onMouseMove: function(e, target){ // BrowserBug: IE hack to see if button was released outside of window. // Needed in IE6-9 in quirks and strictmode if (this.active && Ext.isIE && !e.browserEvent.button) { e.preventDefault(); this.onMouseUp(e); return; } e.preventDefault(); var xy = e.getXY(), s = this.startXY; this.lastXY = xy; if (!this.active) { if (Math.max(Math.abs(s[0]-xy[0]), Math.abs(s[1]-xy[1])) > this.tolerance) { this.triggerStart(e); } else { return; } } // Returning false from a mousemove listener deactivates if (this.fireEvent('mousemove', this, e) === false) { this.onMouseUp(e); } else { this.onDrag(e); this.fireEvent('drag', this, e); } }, onMouseUp: function(e) { // Clear the flag which ensures onMouseOut fires only after the mouse button // is lifted if the mouseout happens *during* a drag. this.mouseIsDown = false; // Remove flag from event singleton delete e.dragTracked; // If we mouseouted the el *during* the drag, the onMouseOut method will not have fired. Ensure that it gets processed. if (this.mouseIsOut) { this.mouseIsOut = false; this.onMouseOut(e); } e.preventDefault(); this.fireEvent('mouseup', this, e); this.endDrag(e); }, /** * @private * Stop the drag operation, and remove active mouse listeners. */ endDrag: function(e) { var doc = Ext.getDoc(), wasActive = this.active; doc.un('mousemove', this.onMouseMove, this); doc.un('mouseup', this.onMouseUp, this); doc.un('selectstart', this.stopSelect, this); this.clearStart(); this.active = false; if (wasActive) { this.onEnd(e); this.fireEvent('dragend', this, e); } // Private property calculated when first required and only cached during a drag delete this._constrainRegion; }, triggerStart: function(e) { this.clearStart(); this.active = true; this.onStart(e); this.fireEvent('dragstart', this, e); }, clearStart : function() { if (this.timer) { clearTimeout(this.timer); delete this.timer; } }, stopSelect : function(e) { e.stopEvent(); return false; }, /** * Template method which should be overridden by each DragTracker instance. Called when the user first clicks and * holds the mouse button down. Return false to disallow the drag * @param {Ext.EventObject} e The event object */ onBeforeStart : function(e) { }, /** * Template method which should be overridden by each DragTracker instance. Called when a drag operation starts * (e.g. the user has moved the tracked element beyond the specified tolerance) * @param {Ext.EventObject} e The event object */ onStart : function(xy) { }, /** * Template method which should be overridden by each DragTracker instance. Called whenever a drag has been detected. * @param {Ext.EventObject} e The event object */ onDrag : function(e) { }, /** * Template method which should be overridden by each DragTracker instance. Called when a drag operation has been completed * (e.g. the user clicked and held the mouse down, dragged the element and then released the mouse button) * @param {Ext.EventObject} e The event object */ onEnd : function(e) { }, /** * </p>Returns the drag target. This is usually the DragTracker's encapsulating element.</p> * <p>If the {@link #delegate} option is being used, this may be a child element which matches the * {@link #delegate} selector.</p> * @return {Ext.core.Element} The element currently being tracked. */ getDragTarget : function(){ return this.dragTarget; }, /** * @private * @returns {Element} The DragTracker's encapsulating element. */ getDragCt : function(){ return this.el; }, /** * @private * Return the Region into which the drag operation is constrained. * Either the XY pointer itself can be constrained, or the dragTarget element * The private property _constrainRegion is cached until onMouseUp */ getConstrainRegion: function() { if (this.constrainTo) { if (this.constrainTo instanceof Ext.util.Region) { return this.constrainTo; } if (!this._constrainRegion) { this._constrainRegion = Ext.fly(this.constrainTo).getViewRegion(); } } else { if (!this._constrainRegion) { this._constrainRegion = this.getDragCt().getViewRegion(); } } return this._constrainRegion; }, getXY : function(constrain){ return constrain ? this.constrainModes[constrain].call(this, this.lastXY) : this.lastXY; }, /** * <p>Returns the X, Y offset of the current mouse position from the mousedown point.</p> * <p>This method may optionally constrain the real offset values, and returns a point coerced in one * of two modes:</p><ul> * <li><code>point</code><div class="sub-desc">The current mouse position is coerced into the * {@link #constrainRegion}, and the resulting position is returned.</div></li> * <li><code>dragTarget</code><div class="sub-desc">The new {@link Ext.util.Region Region} of the * {@link #getDragTarget dragTarget} is calculated based upon the current mouse position, and then * coerced into the {@link #constrainRegion}. The returned mouse position is then adjusted by the * same delta as was used to coerce the region.</div></li> * </ul> * @param constrainMode {String} Optional. If omitted the true mouse position is returned. May be passed * as <code>'point'</code> or <code>'dragTarget'. See above.</code>. * @returns {Array} The <code>X, Y</code> offset from the mousedown point, optionally constrained. */ getOffset : function(constrain){ var xy = this.getXY(constrain), s = this.startXY; return [xy[0]-s[0], xy[1]-s[1]]; }, constrainModes: { // Constrain the passed point to within the constrain region point: function(xy) { var dr = this.dragRegion, constrainTo = this.getConstrainRegion(); // No constraint if (!constrainTo) { return xy; } dr.x = dr.left = dr[0] = dr.right = xy[0]; dr.y = dr.top = dr[1] = dr.bottom = xy[1]; dr.constrainTo(constrainTo); return [dr.left, dr.top]; }, // Constrain the dragTarget to within the constrain region. Return the passed xy adjusted by the same delta. dragTarget: function(xy) { var s = this.startXY, dr = this.startRegion.copy(), constrainTo = this.getConstrainRegion(), adjust; // No constraint if (!constrainTo) { return xy; } // See where the passed XY would put the dragTarget if translated by the unconstrained offset. // If it overflows, we constrain the passed XY to bring the potential // region back within the boundary. dr.translateBy.apply(dr, [xy[0]-s[0], xy[1]-s[1]]); // Constrain the X coordinate by however much the dragTarget overflows if (dr.right > constrainTo.right) { xy[0] += adjust = (constrainTo.right - dr.right); // overflowed the right dr.left += adjust; } if (dr.left < constrainTo.left) { xy[0] += (constrainTo.left - dr.left); // overflowed the left } // Constrain the X coordinate by however much the dragTarget overflows if (dr.bottom > constrainTo.bottom) { xy[1] += adjust = (constrainTo.bottom - dr.bottom); // overflowed the bottom dr.top += adjust; } if (dr.top < constrainTo.top) { xy[1] += (constrainTo.top - dr.top); // overflowed the top } return xy; } } });