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Shuffler Server Control
Source
code by Ryan Trudelle-Schwarz ryants@aspelite.com>
idea by Charles Carroll
Server Controls can totally control
how the information enclosed within them is rendered to the browser. They also
can be deployed by merely placing a .dll file in a /bin directory. No
registration process needed.
The DLL for this is at
/experiments/bin/randomcontrols.dll.
Just download and insert in your C:\inetpub\wwwroot or relevant vroot and sample
will start working.
The samples that use this control
are at /freebook/learn/shuffler.aspx.
This is source code for Iprioritizable object:
filename=/experiments/shuffler/source/iprioritizable.cs
namespace Mamanze.RandomControls
{
public interface IPrioritizable
{
int Priority
{
get;
set;
}
}
}
This is source code for ListItem object:
filename=/experiments/shuffler/source/listitem.cs
namespace Mamanze.RandomControls
{
using System;
using System.Web;
using System.Web.UI;
public class ListItem : Control, IPrioritizable
{
int intPriority = 1;
public int Priority
{
get
{
return intPriority;
}
set
{
intPriority = value;
}
}
protected override void Render(HtmlTextWriter wrtOutput)
{
wrtOutput.RenderBeginTag("div");
for(int i = 0; i < Controls.Count; i++)
{
Controls[i].RenderControl(wrtOutput);
}
wrtOutput.RenderEndTag();
}
}
}
This is source code for ListSection object:
filename=/experiments/shuffler/source/listsection.cs
namespace Mamanze.RandomControls
{
using System;
using System.Collections;
using System.Web.UI;
using Mamanze.RandomControls;
[
ParseChildren(true)
]
public class ListSection : RandomWeighted, IPrioritizable
{
private string strText = "";
private string strTitle = "";
private int intPriority = 1;
// To satisfy the IPrioritized interface, we must implement the
// Priority property.
public int Priority
{
get
{
return intPriority;
}
set
{
intPriority = value;
}
}
// Property to hold the limit on the number of sub elements to display.
public int Limit
{
get
{
return intLimit;
}
set
{
if(value > 0)
intLimit = value;
}
}
// Property to hold the title of this element.
public string Title
{
get
{
return strTitle;
}
set
{
strTitle = value;
}
}
// Allows this element to contain ListItems
public ListItem LI
{
get
{
ListItem x = new ListItem();
Controls.Add(x);
return x;
}
}
// ALlows this element to contain ListSections.
public ListSection LS
{
get
{
ListSection x = new ListSection();
Controls.Add(x);
return x;
}
}
// Renders the element.
override protected void Render(HtmlTextWriter wrtOutput)
{
// Begin the rendering of this parent element.
wrtOutput.AddStyleAttribute("border","solid 1px black;");
wrtOutput.AddStyleAttribute("padding","2px;");
wrtOutput.RenderBeginTag("div");
wrtOutput.AddAttribute("class","title");
wrtOutput.RenderBeginTag("span");
wrtOutput.RenderBeginTag("b");
wrtOutput.Write(Title);
wrtOutput.RenderEndTag();
wrtOutput.RenderEndTag();
wrtOutput.Write("<br />");
// Render the child controls.
base.Render(wrtOutput);
// Finish rendering the parent element.
wrtOutput.RenderEndTag();
}
}
}
This is source code for RandomList object:
filename=/experiments/shuffler/source/RandomList.cs
namespace Mamanze.RandomControls
{
using System;
using System.Collections;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using Mamanze.RandomControls;
[ ParseChildren(true) ]
public class RandomList : RandomWeighted
{
public ListSection LS
{
get
{
ListSection x = new ListSection ();
Controls.Add(x);
return x;
}
}
public ListItem LI
{
get
{
ListItem x = new ListItem();
Controls.Add(x);
return x;
}
}
public int Limit
{
set
{
intLimit = value;
}
}
override protected void OnInit(EventArgs e)
{
base.OnInit(e);
}
}
}
This is source code for RandomWeighted object:
filename=/experiments/shuffler/source/RandomWeighted.cs
namespace Mamanze.RandomControls
{
using System;
using System.Collections;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Mamanze.RandomControls;
public abstract class RandomWeighted : WebControl
{
protected int intLimit = 0;
override protected void Render(HtmlTextWriter wrtOutput)
{
if(Controls.Count > 0)
{
// Generic prioritized variable for temp storage.
IPrioritizable priTemp;
// Point in the controls list to stop rendering.
int intStop = 0;
// If the user specified a limit then use it, otherwise default to 0.
if(intLimit != 0)
{
if(intLimit >= Controls.Count)
{
intStop = 0;
}
else
{
intStop = Controls.Count - intLimit;
}
}
// Used to sort the weight values.
SortedList lstControls = new SortedList(Controls.Count);
// Random number generator.
Random rndGenerator = new Random();
// Variable to hold the random numbers.
int intRandom = 0;
// Limit the random numbers allowed. This will help limit the vollitility of the randomizer.
int intMaxRandom = Controls.Count * 2;
// Variable to hold the value of the element we've selected to display.
int intValue = 0;
// Fill the weight/value list.
for(int i = 0; i < Controls.Count; i++)
{
// Get a reference to the control.
priTemp = (IPrioritizable)Controls[i];
// Loop while the weight/value has already been used.
do
{
intRandom = rndGenerator.Next(intMaxRandom);
}while(lstControls.ContainsKey(priTemp.Priority * intRandom));
// Add the weight/value to the list.
lstControls.Add((priTemp.Priority * intRandom),i);
}
// Loop through and render the controls.
for(int i = (lstControls.Count - 1); i >= intStop; i--)
{
Controls[(int)lstControls.GetByIndex(i)].RenderControl(wrtOutput);
}
}
}
}
}
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There are many worthy charities!!. But perhaps help starving children in Africa or South America AND help Charles too.
a $5 tip buys him lunch at McDonalds,
a $20 tip buys his kid Hitoshi a new computer game,
a $39 tip buys his daughter Michiko a few nice outfits.
See our donor list.
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