Extract UserControls from IssueVision Part I — PaneCaption

文章目錄

• PaneCaption

IssueVision is the code example for Smart Client at DevDays 2004. You can get more infomation from DevDays 2004 video .

There are several XP style UserControls contained in this solution. Now, let's extract them for our own projects.

PaneCaption

PaneCaption draws the caption for each pane. Contains an active state and draws the caption different for each state. Caption is drawn with a gradient fill and antialias font.

Just pick out two files, PaneCaption.cs PaneCaption.resx, we can extract this control.

Create your new “windows control library” project MyControls and add the tow files to your project folder. Build this project and test it in another project.

ok, it's working now!

oh, wait! Why AnitAlias dose not work? I changed again and again, but it is only available in design time! What's wrong ?

yeah, you find out a little bug (i think it belongs the IDE what i am using -- VS.NET2003). Let's defeat it.

look at the following codes:

private bool m_antiAlias = false ; 

 

  [CategoryAttribute("Appearance")]
  [DescriptionAttribute("If should draw the text as antialiased.")]
   [DefaultValueAttribute( true )]
  public bool AntiAlias {
   get {
    return m_antiAlias;
   } 

   set {
    m_antiAlias = value;
    Invalidate();
   }
  } 

 

understood?

what? did not?

oh, my god. Let me explain.

“[DefaultValueAttribute(true)]” means the default value of this property(AntiAlias) is “true“; “private bool m_antiAlias = false;“ means it sets the property variant into “false“ when you put the control on form(design time).

As we known, in visual studio, it will modify the InitializeComponent() automatically when you changed a value in property toolbox. Now, the initialized value is “false” not the default value “true”. Obviously, the IDE think it's the default value! So, it write the opposite code.

Thus, modify “private bool m_antiAlias = false;”into “private bool m_antiAlias = true;”then you will enable “AntiAlias” ability.

Moreover, AllowActive has this problem too. I believe you can solve it yourself.

Enjoy it. ;)