Creating a Custom Color Selection Dialog

Environment: Win32 API (no MFC)

This is a GPL/LGPL color picker demo based on a custom color selector. I coded it as a part of a Win32 server that I use in my graphics apps. It's pure Win32 API C++ and it should compile with VC++ 6.0. For your convenience, there are precompiled binaries in the 'bin' folder.

To Implement the Picker

  1. Build 'server_win.lib' and 'server_util.lib' (with the appropriate DLLs).
  2. Include 'server_win.h' and 'server_util.h' into your source code.
  3. Make a reference to the picker's global instance:
  4.     "c_colorpick& <yourpicker> = colorpick;"
  5. Call the picker where you want it to appear:
  6.     "COLORREF rgb =
                  <yourpicker>.getcolor(<handle to owner window>);"
    
    The function above returns -1 when 'Cancel' is pressed.

To Get the Picker's Settings

  1. Declare an instance of color-info structure:
  2.     "_colorinfo <yourinfo>;"
    This structure will hold the color space type, palette saturation range, and custom colors.
  3. When the picker returns, obtain the above values by calling:
  4.     "<yourpicker>.getinfo(<yourinfo>);"
  5. Then you can save these values into a file so that all settings can be loaded when the app starts again. How it could be done is shown in the "bool writeini()" function in 'colpick_main.cpp'.

To Initialize the Picker to the Last-Saved Settings

  1. Load the file you`ve saved in the previous section and fill in the <yourinfo> structure.
  2. Before you call the picker, make a call:
  3.     "<yourpicker>.setinfo(<yourinfo>);"
  4. Your picker should be initialized. (For details, look at "bool readini()" and "WinMain()" in 'colpick_main.cpp'.)

Known Bug

When using numeric input of HSL or HSV, the entered value sometimes skips down by 1. For example, if you insert 180, the value skips to 179. This is probably due to running the entered value through the whole conversion routine; that might be inexact.

oscar@mail.viapvt.sk

Downloads

Download demo project (Self extracting EXE) - 158 Kb


About the Author

Oto Spal

If you are really interested in who i am, you can visit me at www.armego.sk

Comments

  • best of the bunch...

    Posted by Legacy on 01/12/2004 12:00am

    Originally posted by: Frank Evans

    Thanks for a well polished utility. Numerous color pickers floating around. Yours showed the most love. Good layout, etc.

    Reply
  • This is wonderful.

    Posted by Legacy on 07/25/2003 12:00am

    Originally posted by: Li Zhaoming

    Just by looking at your title pic, I know this is a wonderful article, and the excellent code!

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Today, users, applications, and data exist in more places than ever before, creating an unprecedented challenge for IT. How can IT achieve the flexibility and agility it needs to offer multiple types of applications in multiple locations? To better serve business demands for information everywhere, enterprises must develop new strategies for optimizing multiple kinds of networks. Read this white paper to learn how hybrid networks provide an unprecedented level of network dynamism, enterprise agility, and the …

  • Migrating away from Windows Server 2003 is an investment in your organization's future, and there has never been a better time to begin the migration process. Take the next step to transform your datacenter by upgrading your server platform with leading edge Windows Operating Systems and SanDisk flash solutions.

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date