Home > Others

[5 of the Web chart series] 5. Implementation of Figure tooltip in draw2d

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞
Preface

The first four articles in Series 5 are based on the development of draw2d version 2.3.0.

Currently (2013/05), the latest version of draw2d is version 2.6.1.

The tooltip function is not provided in version 2.3.0, but the tooltip implementation method is provided in version 2.6.1.

Tooltip in version 2.6.1
Before we can see the source code, we thought that the implementation method should be to add a tooltip attribute to the shape in draw2d. JS, and provide some set or hide methods for calling.
This is not the case. First, directly paste the source code: 
MyFigure = draw2d.shape.basic.Rectangle.extend({    NAME : "MyFigure",        init : function()    {        this._super();                this.createPort("input");        this.createPort("output");        this.setDimension(50,50);                this.tooltip = null;    },    /**     * @method     * Change the color and the internal value of the figure.     * Post the new value to related input ports.     *      */    onMouseEnter: function(){        this.showTooltip();    },        onMouseLeave: function(){        this.hideTooltip();    },        setPosition: function(x,y){        this._super(x,y);        this.positionTooltip();    },        hideTooltip:function(){                  this.tooltip.remove();           this.tooltip = null;    },            showTooltip:function(){                  this.tooltip= $('<div class="tooltip">Tooltip</div>').appendTo('body');        this.positionTooltip();            },        positionTooltip: function(){        if( this.tooltip===null){            return;        }                var width =  this.tooltip.outerWidth(true);        var tPosX = this.getAbsoluteX()+this.getWidth()/2-width/2+8;        var tPosY = this.getAbsoluteY()+this.getHeight() + 20;        this.tooltip.css({'top': tPosY, 'left': tPosX});    }    });

It can be found that the implementation method is actually stacked and is not modified in the original definition, but provided to developers for expansion.
Inherit a shape class -- when mouse enter and mouse leave are used, the tooltip. tooltip implementation is to add a div on the body page and set the CSS style and position of the div.
In this way, you can add tooltip in the old version based on this method.
Failed. The cause is that the onmouseenter and onmouseleave event trigger methods are not executed. It seems that to achieve this effect, you need to modify draw2d. js so that the mouse enter and mouse leave event methods of the shape can be executed. In addition, you need to add the CSS of tooltip.

Other solutions of earlier versions

If the old version of draw2d is used, is there any other way to implement the tooltip function?
The answer is yes.
The implementation principle should be similar to that of the new version.
Before introducing the solution, let's first introduce jqueyui
Jquery UI-jquery user interface is an interface element implemented by jquery.
The tooltip component is available in jqueryui 1.9 and later versions. (Neither version 1.8 nor earlier)
Let's take a look at the implementation:

<!-- by oscar999 --><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

The implementation method is: Find whether the page element has the title attribute. If so, add the DIV Of The tooltip.
Therefore, if we add the title attribute to the SVG figure of the page, we can display the beautiful tootip.




If you want to add tooltip to a shape like rectangle


Modify the settings as follows:


1. repaint definition of draw2d. Shape. Basic. rectangle


Add the following section (the reason for defining attributes in repaint instead of init is that attributes is used in repaint)




attributes.title = stitle;


2. createshapeelement definition section of draw2d. Shape. Basic. Rectangle. (This section uses Raphael to create a shape)


    createShapeElement: function () {            return this.canvas.paper.rect(this.getAbsoluteX(), this.getAbsoluteY(), this.getWidth(), this.getHeight(), null, this.getTitle());    }


3. Add the title attribute to the shape created by Raphael.


    //add title    paperproto.rect = function (x, y, w, h, r ,t) {            var out = R._engine.rect(this, x || 0, y || 0, w || 0, h || 0, r || 0, t || "");        this.__set__ && this.__set__.push(out);        return out;    };




    //add title    R._engine.rect = function (svg, x, y, w, h, r, t) {        var el = $("rect");        svg.canvas && svg.canvas.appendChild(el);        var res = new Element(el, svg);                res.attrs = {x: x, y: y, width: w, height: h, r: r || 0, rx: r || 0, ry: r || 0, fill: "none", stroke: "#000", title: t || ""};        res.type = "rect";        $(el, res.attrs);        return res;    };

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
implementation of ajax in php increments of 5 tangent of 5 degrees what 5 of 29 what 5 of 36 modulus of 5 what 5 of 32

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More