Click here to Skip to main content
13,504,308 members
Click here to Skip to main content
Add your own
alternative version


29 bookmarked
Posted 24 Aug 2007

DrolC Control Extender

, 24 Aug 2007
Rate this:
Please Sign up or sign in to vote.
Get a nice unified look and feel with grouped controls

Screenshot - screen_01.jpg


This article's goal is to show developers how to improve and get a pretty good custom unified look and feel on Windows applications.


I noticed PureComponent's (VisualExtender) format, where you get your regular Windows Forms controls laid out within a nice bar where you can set a title, title icon and a control icon to make it easier to understand for the user. I thought that couldn't be to hard to mimic and I was right. It took me a couple of hours to write the code we are going to discuss in this article.

Using the Code

First off, the only thing you need to do to get started using this control extender is to download the demo project and include DrolC.dll as a reference to your project. If you also want it in your toolbox, right click on the Toolbox page where you want to add it and select the menu item "Choose Items." Browse to the folder where you extracted the downloaded ZIP, navigate into the bin/Debug folder and select the DrolC.dll file. Then you just click OK and the control will appear in the toolbox.

Using the code, hm... It can't be any simpler than just dragging and dropping the control from the toolbox. Then just associate another Windows Forms control that derives from the Control class (TextBox, ListBox, ComboBox, etc) by selecting ControlEx in the Properties window and selecting the control you want. Then the control is ready for your use. Oh, and yeah. Add some color, some images, a title and ta-daa: your regular Windows Form control looks stunning.

The extra Properties you will find in the Properties window and on the Control are the following:

Screenshot - properties.jpg

// This is the "Actual" control that is attatched to 
// the DrolC Control
public Control ControlEx

// This is the second (2) background color so we can make 
// a nice Linear Gradient on the control
public Color FadeBgColor

// This is the value that is used when drawing the 
// Linear Gradient with BackColor and FadeBgColor
public float FadeAngel

// This is the Icon attatched to the Left side icon
public Image LabelIcon

// This is the Icon that is attatched to the right of the ControlEx 
// control
public Image ControlIcon

// This value tells the control how mutch we are going to round the 
// corners for the DrolC control
public float CornerRadius

// Tells the DrolC layout code how mutch spacing we are going to apply 
// between the controls.
public int LayoutSpacing

// The border color of the control
public Color BorderColor

// The width to use for the border, default is set to 2
public int BorderWidth

// This is the text we apply to our label that describes what 
// the ControlEx input 
// is supposed to be. Ex. "Enter First Name"
public string Title

// THIS value is the most important value in the control. It 
// describes in procent (%) 
// how mutch space the Label will take. All other space will be 
// assigned between 
// the ControlEx and the Images (if any images)
public float TitleWidthProcent

// Describes the Font for the Label
public Font TitleFont

// Describes with color the border will have when the DrolC control has Focus
public Color ActiveBorderColor

So, How Does the Layout Logic Work Then?

Well, there's only one really simple method that handles the layout and it's the DoLayout() method. In this method, we calculate the size for all of the controls and images. We also calculate the internal position for the controls. I think the code is more descriptive than if I were to write any more about it. :o)

private void DoLayout()
    if( this._textLabel == null )

    int y = 0;

    this._textLabel.Location = new Point( _layoutSpacing, 0 );
    this._textLabel.Height = this.Height;
    this._textLabel.Width = 
        (int)( this.Width * ( _titleWidthProcent / 100 ) );
    if( this._textLabel.Width < 50 )
        this._textLabel.Width = 50;

    int controlExWidth = 
        ( this.Width - ( this._layoutSpacing * 2 ) ) - this._textLabel.Width;
    if( this._labelIcon != null )
        controlExWidth -= this._labelIcon.Width;
        y = ( this.Height / 2 ) - ( this._labelIcon.Height / 2 );
        _labelIconRC = 
            new Rectangle( _textLabel.Width + _textLabel.Location.X,
            y, _labelIcon.Width, _labelIcon.Height );

    y = ( this.Height / 2 ) - ( this._actualControl.Height / 2 );
    this._actualControl.Location = 
        new Point( this._layoutSpacing + this._textLabel.Location.X + 
        this._textLabel.Width + 
        ( _labelIcon != null ? _labelIcon.Width : 0 ), y );

    if( this._controlIcon != null )
        controlExWidth -= 
            ( this._controlIcon.Width + this._layoutSpacing * 2 );
        y = ( this.Height / 2 ) - ( this._controlIcon.Height / 2 );
        _controlIconRC = 
            new Rectangle( this._layoutSpacing + controlExWidth + 
             y, _controlIcon.Width, 
             this._controlIcon.Height );
        controlExWidth -= (int)this._cornerRadius;

    this._actualControl.Width = controlExWidth;
    this.ResumeLayout( false );


Points of Interest

I will continue to write some more DrolC controls and Control Extenders. They will all be submitted to The Code Project.

The next step is to write a layout panel that automatically manages the DrolC controls it contains and auto-adjusts the label width, etc. between the controls to get an even easier way to extend and customize the Windows UI.

Just let me know if there are any bugs and/or performance issues and I will fix them. That's a promise. :)

For the ones that have been awake during this article, kudos! And yes, for all of you that have used my iBar control, it works great with the DrolC control, too. Check it out here, iBar (Code Project hosted), if you haven't already =)


  • 23 August, 2007 -- This is release 1.0 of this control. More will be released as soon as I get some spare time.


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here


About the Author

Software Developer Microsoft, Skype Division
Sweden Sweden
I'm a pragmatic developer working as a Software Development Engineer at Microsoft, Skype Division - Windows Phone

You may also be interested in...


Comments and Discussions

QuestionHow to implement as an actual extender? Pin
Furty26-Aug-07 18:07
memberFurty26-Aug-07 18:07 
AnswerRe: How to implement as an actual extender? Pin
Snews26-Aug-07 20:27
memberSnews26-Aug-07 20:27 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Praise Praise    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

Permalink | Advertise | Privacy | Terms of Use | Mobile
Web01 | 2.8.180417.1 | Last Updated 24 Aug 2007
Article Copyright 2007 by Snews
Everything else Copyright © CodeProject, 1999-2018
Layout: fixed | fluid