Issue with EmptyArea Not Working When Using C1ThemeController

Issue with EmptyArea Not Working When Using C1ThemeController

Posted by: andrea.davoli on 1 April 2025, 9:52 am EST

• 

  andrea.davoli

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  Posted 1 April 2025, 9:52 am EST - Updated 1 April 2025, 9:57 am EST

  Hi everyone,

  I’m experiencing an issue with the EmptyArea not working when applying themes using C1ThemeController. Without a theme, the EmptyArea behaves as expected, but once a theme is applied, it seems to stop functioning.

  Is this a known issue, or am I missing something in the configuration?

  This is the component
  
  

  I put a Theme with the component
  
  

  

  1083×711 51.7 KB

  Then I put styles - EmptyArea - backcolor - white.
  
  

  

  1333×675 79.8 KB

  When I compile and run the program, I find it like this: it didn’t apply the white EmptyArea
  
  

  

  593×561 134 KB

  I can set it via code, but sometimes it briefly shows the wrong EmptyArea before displaying the correct one. It should work directly through the designer.

  Thank you!

• 

  uttkarsh.matiyal

  

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  Posted 2 April 2025, 1:17 am EST

  Hello,

  When a Theme is used, styling properties are overridden by Theme styles. To overcome this behavior, you can create your custom Theme or change the Theme property at run-time as follows:

  public Form1()
  {
      InitializeComponent();
  
      // Get theme by name. 
      var theme = C1ThemeController.GetThemeByName("Office2010Blue", true);
      SetBackgroundProperty(theme, "C1FlexGrid\\Styles\\EmptyArea\\Background", Color.White);
      C1ThemeController.ApplyThemeToControlTree(this, theme);
  }
  
  private bool SetBackgroundProperty(C1Theme theme, string propPath, Color color)
  {
      if (theme != null)
      {
          // Get the color property at the specified path.
          var prop = theme.Children.GetItemByPath(propPath) as BackgroundProp;
          if (prop != null)
          {
              prop.Value = ThemeBackground.White;
              return true;
          }
      }
      return false;
  }

  If you set it at run-time, EmptyArea’s BackColor will not be visible in the designer.

  For more information on creating your custom theme, please refer to https://developer.mescius.com/componentone/docs/win/online-themes/overview.html.

  To get the path to the theme property, you can right-click the desired property in C1ThemeDesigner → Copy Name → Name.

  Please refer to the attached sample for implementation of the run-time method. (see FlexGrid_ThemeSample.zip)

  Regards,
  
  Uttkarsh.

• 

  andrea.davoli

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  Posted 3 April 2025, 11:32 am EST

  Thank you!