source: other-projects/tipple-android/i-greenstone-server-files/greenstone/webapps/greenstone3/interfaces/default/js/jquery-ui-1.8.15/ui/jquery.ui.mouse.js@ 26899

/*!
 * jQuery UI Mouse 1.8.15
 *
 * Copyright 2011, AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://jquery.org/license
 *
 * http://docs.jquery.com/UI/Mouse
 *
 * Depends:
 *  jquery.ui.widget.js
 */
(function( $, undefined ) {

$.widget("ui.mouse", {
    options: {
        cancel: ':input,option',
        distance: 1,
        delay: 0
    },
    _mouseInit: function() {
        var self = this;

        this.element
            .bind('mousedown.'+this.widgetName, function(event) {
                return self._mouseDown(event);
            })
            .bind('click.'+this.widgetName, function(event) {
                if (true === $.data(event.target, self.widgetName + '.preventClickEvent')) {
                    $.removeData(event.target, self.widgetName + '.preventClickEvent');
                    event.stopImmediatePropagation();
                    return false;
                }
            });

        this.started = false;
    },

    // TODO: make sure destroying one instance of mouse doesn't mess with
    // other instances of mouse
    _mouseDestroy: function() {
        this.element.unbind('.'+this.widgetName);
    },

    _mouseDown: function(event) {
        // don't let more than one widget handle mouseStart
        // TODO: figure out why we have to use originalEvent
        event.originalEvent = event.originalEvent || {};
        if (event.originalEvent.mouseHandled) { return; }

        // we may have missed mouseup (out of window)
        (this._mouseStarted && this._mouseUp(event));

        this._mouseDownEvent = event;

        var self = this,
            btnIsLeft = (event.which == 1),
            elIsCancel = (typeof this.options.cancel == "string" ? $(event.target).closest(this.options.cancel).length : false);
        if (!btnIsLeft || elIsCancel || !this._mouseCapture(event)) {
            return true;
        }

        this.mouseDelayMet = !this.options.delay;
        if (!this.mouseDelayMet) {
            this._mouseDelayTimer = setTimeout(function() {
                self.mouseDelayMet = true;
            }, this.options.delay);
        }

        if (this._mouseDistanceMet(event) && this._mouseDelayMet(event)) {
            this._mouseStarted = (this._mouseStart(event) !== false);
            if (!this._mouseStarted) {
                event.preventDefault();
                return true;
            }
        }

        // Click event may never have fired (Gecko & Opera)
        if (true === $.data(event.target, this.widgetName + '.preventClickEvent')) {
            $.removeData(event.target, this.widgetName + '.preventClickEvent');
        }

        // these delegates are required to keep context
        this._mouseMoveDelegate = function(event) {
            return self._mouseMove(event);
        };
        this._mouseUpDelegate = function(event) {
            return self._mouseUp(event);
        };
        $(document)
            .bind('mousemove.'+this.widgetName, this._mouseMoveDelegate)
            .bind('mouseup.'+this.widgetName, this._mouseUpDelegate);

        event.preventDefault();
        event.originalEvent.mouseHandled = true;
        return true;
    },

    _mouseMove: function(event) {
        // IE mouseup check - mouseup happened when mouse was out of window
        if ($.browser.msie && !(document.documentMode >= 9) && !event.button) {
            return this._mouseUp(event);
        }

        if (this._mouseStarted) {
            this._mouseDrag(event);
            return event.preventDefault();
        }

        if (this._mouseDistanceMet(event) && this._mouseDelayMet(event)) {
            this._mouseStarted =
                (this._mouseStart(this._mouseDownEvent, event) !== false);
            (this._mouseStarted ? this._mouseDrag(event) : this._mouseUp(event));
        }

        return !this._mouseStarted;
    },

    _mouseUp: function(event) {
        $(document)
            .unbind('mousemove.'+this.widgetName, this._mouseMoveDelegate)
            .unbind('mouseup.'+this.widgetName, this._mouseUpDelegate);

        if (this._mouseStarted) {
            this._mouseStarted = false;

            if (event.target == this._mouseDownEvent.target) {
                $.data(event.target, this.widgetName + '.preventClickEvent', true);
            }

            this._mouseStop(event);
        }

        return false;
    },

    _mouseDistanceMet: function(event) {
        return (Math.max(
                Math.abs(this._mouseDownEvent.pageX - event.pageX),
                Math.abs(this._mouseDownEvent.pageY - event.pageY)
            ) >= this.options.distance
        );
    },

    _mouseDelayMet: function(event) {
        return this.mouseDelayMet;
    },

    // These are placeholder methods, to be overriden by extending plugin
    _mouseStart: function(event) {},
    _mouseDrag: function(event) {},
    _mouseStop: function(event) {},
    _mouseCapture: function(event) { return true; }
});

})(jQuery);