一点一滴打造我们自己的web开发框架系列4【web进度条的开发（下）】

　　【概述】几乎每个企业都有自己的核心东西或说是框架性的东西，框架的好处是将我们经常要使用的功能，控件等包装一个个
易于使用的单元，就算是初学者也极其容易上手，减少项目的开发成本。因此框架的重要性和好处是不言而喻的。在我的这个系列
(一点一滴打造我们自己的web开发框架系列 )当中，我将自己在开发过程中用到的一些东西陆续公布出来，和大家一起交流学习。

　　这次我们接着本框架系统的开发进展，将我们上一节开发的客户端进度条包装成一个服务器控件，方便以后的使用。上次我们开发
的进度条是通过setInterval来自动滚动进度条的，但是有时候比如我们要导入数据，我们知道总共要导入的数据，及当前我们正在导入
的数据，这时候我们可以手动来设置这个进度条的提示信息和进度条的前进。因此在上节的基础上，对ProgressBar.js稍微做了下扩展，
添加了两个属性：

this.TickCount = typeof (tickCount) == 'undefined' ? 100 : tickCount;
this.StepManually = false; //是否手动设置前进

 TickCount为步进的次数，在实际应用中可以指定为总共要导入的数据条数等。

并添加了响应的事件：

step: function(currentStep) {
    var currentWidth = window.Progress._progrss.style.pixelWidth;
    if (currentStep < window.Progress.TickCount) {
        window.Progress._progrss.style.width = currentWidth + window.Progress._tickWidth + "px";
        window.Progress._innerDown.innerText = window.Progress.TipMessage;
        window.Progress._mark.style.display = "block";
    }
    else {
        if (window.Progress.CompleteEvent != null) {
            if (typeof window.Progress.CompleteEvent == 'function')
                window.Progress.CompleteEvent.call();
            else
                eval(window.Progress.CompleteEvent);
        }
    }
},

_getTickWidth: function() {
    var totalWidth = this._inner.style.pixelWidth;
    var currentWidth = this._progrss.style.pixelWidth;
    var tickWidth = this._round((totalWidth - currentWidth) / this.TickCount, 0);
    return tickWidth;
},

完善客户端事件后，我们将每个公开的属性包装成服务器控件的属性。然后在onPreRender事件中注册相应的初始化脚步：

[ToolboxData("<{0}:ProgressBar runat=server></{0}:ProgressBar>")]
    public class ProgressBar:WebControl
    {
        /// <summary>
        /// 进度条存活时间
        /// </summary>
        [Bindable(true), Browsable(true), DefaultValue(10), Description("进度条存活时间")]
        public int AliveSeconds
        {
            get
            {
                if (ViewState[this.ID + "_AliveSeconds"] != null)
                    return (int)ViewState[this.ID + "_AliveSeconds"];

                return 10;
            }
            set
            {
                ViewState[this.ID + "_AliveSeconds"] = value;
            }
        }

        /// <summary>
        /// 每次滚动条的步长
        /// </summary>
        [Bindable(true), Browsable(true), DefaultValue(2), Description("自动前进时要前进的步长")]
        public int TickWidth
        {
            get
            {
                if (ViewState[this.ID + "_TickWidth"] != null)
                    return (int)ViewState[this.ID + "_TickWidth"];

                return 2;
            }
            set
            {
                ViewState[this.ID + "_TickWidth"] = value;
            }
        }
        /// <summary>
        /// 手动前进时要前进的步数
        /// </summary>
        [Bindable(true), Browsable(true), DefaultValue(100), Description("手动前进时要前进的步数")]
        public int TickCount
        {
            get
            {
                if (ViewState[this.ID + "_TickCount"] != null)
                    return (int)ViewState[this.ID + "_TickCount"];

                return 100;
            }
            set
            {
                ViewState[this.ID + "_TickCount"] = value;
            }
        }
        /// <summary>
        /// 是否手动来设置前进的值
        /// </summary>
        [Bindable(true), Browsable(true), DefaultValue(false), Description("是否手动来设置前进的值")]
        public bool StepManually
        {
            get
            {
                if (ViewState[this.ID + "_StepManually"] != null)
                    return (bool)ViewState[this.ID + "_StepManually"];

                return false;
            }
            set
            {
                ViewState[this.ID + "_StepManually"] = value;
            }
        }
        /// <summary>
        /// 进度条100%时，要响应的客户端事件
        /// </summary>
        [Bindable(true), Browsable(true), DefaultValue(""), Description("进度条完成时要响应的客户端事件")]
        public string CompleteEvent
        {
            get
            {
                if (ViewState[this.ID + "_CompleteEvent"] != null)
                    return (string)ViewState[this.ID + "_CompleteEvent"];

                return "";
            }
            set
            {
                ViewState[this.ID + "_CompleteEvent"] = value;
            }
        }
        /// <summary>
        /// 提示信息
        /// </summary>
        [Bindable(true), Browsable(true), DefaultValue(""), Description("进度条的提示信息")]
        public string TipMessage
        {
            get
            {
                if (ViewState[this.ID + "_TipMessage"] != null)
                    return (string)ViewState[this.ID + "_TipMessage"];

                return "数据正在加载中......";
            }
            set
            {
                ViewState[this.ID + "_TipMessage"] = value;
            }
        }

        protected override void AddAttributesToRender(HtmlTextWriter writer)
        {
            base.AddAttributesToRender(writer);
            writer.AddStyleAttribute(HtmlTextWriterStyle.Display, "none");
        }
        /// <summary>
        /// 呈现菜单
        /// </summary>
        /// <param name="writer"></param>
        protected override void OnPreRender(EventArgs e)
        {
            base.OnPreRender(e);

            this.Page.ClientScript.RegisterClientScriptResource(this.GetType(), "Hjp.WebDesigner.WebControls.ProgressBar.ProgressBar.js");

            StringBuilder script = new StringBuilder();
            script.Append("\nvar " + this.UniqueID + " = new ProgressBar();\n");
            if (this.StepManually)
            {
                script.Append("" + this.UniqueID + ".StepManually=" + this.StepManually.ToString().ToLower() + ";\n");
                script.Append("" + this.UniqueID + ".TickCount=" + this.TickCount + ";\n");
                script.Append("" + this.UniqueID + ".CompleteEvent=\"" + this.CompleteEvent + "\";\n");
            }
            else
            {
                script.Append("" + this.UniqueID + ".AliveSeconds=" + this.AliveSeconds + ";\n");
                script.Append("" + this.UniqueID + ".TickWidth=" + this.TickWidth + ";\n");
                script.Append("" + this.UniqueID + ".CompleteEvent=\"" + this.CompleteEvent + "\";\n");
                script.Append("" + this.UniqueID + ".TipMessage=\"" + this.TipMessage + "\";\n");
            }
            this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), this.UniqueID, script.ToString(), true);
        }
    }

 客户端应用服务器控件：

<cc1:ProgressBar ID="ProgressBar1" runat="server" 
    AliveSeconds="5" 
    TickWidth="3"
    CompleteEvent="hide"
    TipMessage="loading..."/>

代码下载：https://files.cnblogs.com/jackhuclan/progressbar.rar

截图看看效果（还一张图看上一篇文章，或下载代码）：