Color Dialog Box - Win32 apps (2023)

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Displays a modal dialog box that allows the user to choose a specific color value. The user can choose a color from either a set of basic or custom color palettes. Alternatively, the user can generate a color value by modifying the RGB or hue, saturation, luminosity (HSL) color values of the dialog box user interface. The Color dialog box returns the RGB value of the color selected by the user.

You create and display a Color dialog box by initializing a CHOOSECOLOR structure and passing the structure to the ChooseColor function. By setting different parameter values for the CHOOSECOLOR structure, you can affect how the Color dialog box appears. For example, you can display either a full or partial user interface version of the dialog box. The following illustration shows the full user interface version of the Color dialog box.

Color Dialog Box - Win32 apps (1)

If the user clicks the OK button, ChooseColor returns TRUE. The rgbResult member of the CHOOSECOLOR structure contains the RGB color value of the color selected by the user. The RGB color value specifies the intensities of the individual red, green, and blue colors that make up the selected color. The individual values range from 0 through 255. Use the GetRValue, GetGValue, and GetBValue macros to extract individual colors from an RGB color value.

(Video) Visual C++ 6.0 Color Dialog Box

If the user cancels the Color dialog box or an error occurs, ChooseColor returns FALSE and the rgbResult member is not defined. To determine the cause of the error, call the CommDlgExtendedError function to retrieve the extended error value.

The following subjects are covered in this section

  • Full and Partial Color Dialog Boxes
  • Customizing the Color Dialog Box
    • To provide a custom template for the Color dialog box
    • To enable a hook procedure for the Color dialog box
  • Color Models Used by the Color Dialog Box
    • RGB Color Model
    • HSL Color Model
    • Converting HSL Values to RGB Values

Full and Partial Color Dialog Boxes

The Color dialog box has a full version and a partial version of the user interface. The full version includes the basic controls and has additional controls that allow the user to create custom colors. The partial version has controls that display the basic and custom color palettes from which the user can select a color value.

The partial version of the Color dialog box includes a Define Custom Colors button. The user can click this button to display the full version. You can direct the Color dialog box to always display the full version by setting the CC_FULLOPEN flag in the Flags member of the CHOOSECOLOR structure. To prevent the user from creating custom colors, you can set the CC_PREVENTFULLOPEN flag to disable the Define Custom Colors button.

The basic colors represent a selection of the colors available on the specified device. The actual number of colors displayed is determined by the display driver. For example, a VGA driver displays 48 colors, and a monochrome display driver displays only 16.

The custom colors are those that you specify or that the user creates. When you create a Color dialog box, you must use the lpCustColors member of the CHOOSECOLOR structure to specify the initial values for the 16 custom colors. If the full version of the Color dialog box is open, the user can create a custom color by one the following methods:

(Video) C# Color Dialog Box Control in Windows Application

  • Moving the cursor in the color spectrum control and the luminosity slide control
  • Typing RGB values in the Red, Green, and Blue edit controls
  • Typing HSL values in the Hue, Sat, and Lum edit controls

To add a new custom color to the custom colors display, the user can click the Add to Custom Colors button. This also causes the dialog box to copy the RGB value of the new color to the corresponding element in the array pointed to by the lpCustColors member. To preserve new custom colors between calls to ChooseColor, you should allocate static memory for the array. For more information about the RGB and HSL color models, see Color Models Used by the Color Dialog Box.

Customizing the Color Dialog Box

To customize a Color dialog box, you can use any of the following methods:

  • Specify values in the CHOOSECOLOR structure when you create the dialog box
  • Provide a custom template
  • Provide a hook procedure

You can modify the appearance and behavior of the Color dialog box by setting flags in the Flags member of the CHOOSECOLOR structure. For example, you can set the CC_SOLIDCOLOR flag to direct the dialog box to display only solid colors. To cause the dialog box to initially select a color other than black, set the CC_RGBINIT flag and specify a color in the rgbResult member.

You can provide a custom template for the Color dialog box, for example, if you want to include additional controls that are unique to your application. The ChooseColor function uses your custom template in place of the default template.

To provide a custom template for the Color dialog box

  1. Create the custom template by modifying the default template specified in the Color.dlg file. The control identifiers used in the default Color dialog template are defined in the Color.dlg file.
  2. Use the CHOOSECOLOR structure to enable the template as follows:
    • If your custom template is a resource in an application or dynamic link library, set the CC_ENABLETEMPLATE flag in the Flags member. Use the hInstance and lpTemplateName members of the structure to identify the module and resource name.

      -Or-

      (Video) How to use the color dialog box | Show a Color Palette with the ColorDialog Component

    • If your custom template is already in memory, set the CC_ENABLETEMPLATEHANDLE flag. Use the hInstance member to identify the memory object that contains the template.

You can provide a CCHookProc hook procedure for the Color dialog box. The hook procedure can process messages sent to the dialog box. It can also use registered messages to control the behavior of the dialog box. If you use a custom template to define additional controls, you must provide a hook procedure to process input for your controls.

To enable a hook procedure for the Color dialog box

  1. Set the CC_ENABLEHOOK flag in the Flags member of the CHOOSECOLOR structure.
  2. Specify the address of the hook procedure in the lpfnHook member.

After processing its WM_INITDIALOG message, the dialog box procedure sends a WM_INITDIALOG message to the hook procedure. The lParam parameter of this message is a pointer to the CHOOSECOLOR structure used to initialize the dialog box.

The dialog box sends the COLOROKSTRING registered message to the hook procedure when the user clicks the OK button. The hook procedure can reject the selected color and force the dialog box to remain open by returning zero when it receives this message. The hook procedure can force the dialog box to select a particular color by sending the SETRGBSTRING registered message to the dialog box. To use these registered messages, you must pass the COLOROKSTRING and SETRGBSTRING constants to the RegisterWindowMessage function to get a message identifier. You can then use the identifier to detect and process messages sent from the dialog box, or to send messages to the dialog box.

Color Models Used by the Color Dialog Box

The custom colors extension of the Color dialog box allows the user to specify a color using RGB or HSL values. However, the CHOOSECOLOR structure uses only RGB values to report the colors created or selected by the user.

  • RGB Color Model
  • HSL Color Model
  • Converting HSL Values to RGB Values

RGB Color Model

The RGB model is used to designate colors for displays and other devices that emit light. Valid red, green, and blue values range from 0 through 255, with 0 indicating minimum intensity and 255 indicating maximum intensity. The following illustration shows how the primary colors red, green, and blue can be combined to produce four additional colors. (For display devices, the color black results when the red, green, and blue values are set to 0. In display technology, black is the absence of all colors.)

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Color Dialog Box - Win32 apps (2)

The following table lists eight colors of the RGB model and their associated RGB values.

ColorRGB values
Red255, 0, 0
Green0, 255, 0
Blue0, 0, 255
Cyan0, 255, 255
Magenta255, 0, 255
Yellow255, 255, 0
White255, 255, 255
Black0, 0, 0

The system stores internal colors as 32-bit RGB values that have the following hexadecimal form: 0x00bbggrr.

The low-order byte contains a value for the relative intensity of red; the second byte contains a value for green; and the third byte contains a value for blue. The high-order byte must be zero.

You can use the RGB macro to get an RGB value based on specified intensities for the red, green, and blue components. Use the GetRValue, GetBValue, and GetGValue macros to extract individual colors from an RGB color value.

HSL Color Model

The Color dialog box provides controls for specifying HSL values. The following illustration shows the color spectrum control and the luminosity slide control that appear in the Color dialog box. The illustration also shows the ranges of values the user can specify with these controls.

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Color Dialog Box - Win32 apps (3)

In the Color dialog box, the saturation and luminosity values must be in the range 0 through 240, and the hue value must be in the range 0 through 239.

Converting HSL Values to RGB Values

The dialog box procedure provided in Comdlg32.dll for the Color dialog box contains code that converts HSL values to the corresponding RGB values. The following table lists eight colors of the RGB model and their associated HSL and RGB values.

ColorHSL valuesRGB values
Red(0, 240, 120)(255, 0, 0)
Yellow(40, 240, 120)(255, 255, 0)
Green(80, 240, 120)(0, 255, 0)
Cyan(120, 240, 120)(0, 255, 255)
Blue(160, 240, 120)(0, 0, 255)
Magenta(200, 240, 120)(255, 0, 255)
White(0, 0, 240)(255, 255, 255)
Black(0, 0, 0)(0, 0, 0)

FAQs

What is purpose of color dialog box? ›

Full and Partial Color Dialog Boxes

The full version includes the basic controls and has additional controls that allow the user to create custom colors. The partial version has controls that display the basic and custom color palettes from which the user can select a color value.

How do I create a dialog box in win32? ›

You create a modal dialog box by using the DialogBox function. You must specify the identifier or name of a dialog box template resource and a pointer to the dialog box procedure. The DialogBox function loads the template, displays the dialog box, and processes all user input until the user closes the dialog box.

What is the dialogue box in Word? ›

A: A dialog box is a small window that a program pops open to request input from the user. For example, in Word if you click on the Save icon and the document hasn't already been named, Word will pop open a dialog box that prompts you to name the file and tell the program where to save it.

How do I use color dialog windows forms? ›

To create a ColorDialog control at design-time, you simply drag and drop a ColorDialog control from Toolbox to a Form in Visual Studio. After you drag and drop a ColorDialog on a Form, the ColorDialog looks like Figure 2. Adding a ColorDialog to a Form adds following two lines of code.

What is Colour tool for? ›

A color picker (also color chooser or color tool) is a graphical user interface widget, usually found within graphics software or online, used to select colors and, in some cases, to create color schemes (the color picker might be more sophisticated than the palette included with the program).

How do I get my dialog box back? ›

If you realise that a dialogue box is missing then please do the following : Press the ALT key and Spacebar together.

Where is dialog box in computer? ›

In Microsoft Windows, when you right-click a file and choose Properties, you are presented with the Properties dialog box. You can press Esc to cancel or close a dialog box. If the Esc key does not work, click the Cancel button or X button if available.

How do you open a dialog box? ›

CTRL + F12 help to open dialogue box. Which is used to open saved file from the computer.

Where is the hidden dialog box? ›

Hidden Dialog Boxes

If you can't see or can't access the dialog box you need to close, try holding "Alt" and pressing "Tab" repeatedly to cycle through all open windows. This key combination can bring up a dialog box that gets stuck behind other windows.

Why is dialog box launcher used? ›

A dialog box launcher is a small icon that appears in a group. Users click this icon to open related dialog boxes or task panes that provide more options that relate to the group.

How do I change the color of my dialog box in Windows 10? ›

Replies (5) 
  1. Click on Windows button.
  2. Click Settings.
  3. Click Personalization.
  4. Click Colors.
  5. Choose the color that you want or you may still customize your desktop background by clicking High contrast settings.

What are the Microsoft colors? ›

The official Microsoft colors are orange red, green, blue, yellow and gray. We recommend using the Microsoft color palette for personal projects and in the case of commercial use to visit the company website. The color codes: RGB, CYMK for print, Hex for web and the Pantone colors can be seen below.

How do you use color dialog in Visual Basic? ›

Clicking on the Change Color button, the color dialog appears, select a color and click the OK button. The selected color will be applied as the forecolor of the text of the label.

What is font dialog box? ›

The Font dialog box lets the user choose attributes for a logical font, such as font family and associated font style, point size, effects (underline, strikeout, and text color), and a script (or character set).

Which property is used in Windows desktop application form to set font color? ›

DefaultCellStyle property to set these styles for the entire control.

What is font dialog in VB net? ›

The Font Dialog Box allows the user to select the font family, style, and size for the text in an application. However, a user can also select the font color and apply the current setting to the selected text of the control by clicking the Apply button.

How many colors are there? ›

It has been determined by people who determine such things that there are somewhere around 18 decillion varieties of colors available for your viewing enjoyment. That's an 18 followed by 33 zeros. Is that infinity?

How do I know my color type? ›

Use the veins on your wrist to tell if you have cool or warm undertones. Lift your wrist to eye-level in natural light and inspect your veins on the inside of your wrist. If your veins look green or greenish-blue, your skin has warm undertones. If the veins look blue or purple, you have cool undertones.

What is color selection? ›

By Kirsten GhasterJune 20, 2016. Color in design is very subjective. What evokes a particular reaction in one person may evoke a very different reaction in someone else. Often this is due to personal preference, and other times due to cultural background.

Why is it called a dialog box? ›

They are so-called because they form a dialog between the computer and the user—either informing the user of something, or requesting input from the user, or both. Different types of dialog boxes are used for different sorts of user interaction.

What is the use of dialog? ›

Dialogue is typically a conversation between two or more people in a narrative work. As a literary technique, dialogue serves several purposes. It can advance the plot, reveal a character's thoughts or feelings, or show how characters react in the moment.

What is dialog box in Web? ›

A dialog box is a user interface element, a type of window that is used to enable communication and interaction between a user and a software program.

Why is windows dialog not showing? ›

If the dialog or window you expect is not showing up, it is likely the result of the being in a location where you cannot see it, perhaps because of changing your screen resolution to a lower resolution value than you had previously, or because you had multiple monitors and are now using only one monitor.

How do I turn off hidden dialog box? ›

Click the x button from the top right corner of the dialog box that you'd like to close. Clicking this button should close the box and make it vanish.

How do I close a windows dialog box? ›

Right-click the icon referring to the dialog box from the Windows taskbar and click “Close”.

What are the menus dialog boxes? ›

Dialog boxes allow the user to input more than one item into the menu. A dialog boxes is sometimes referred to as a menu panel or simply panel. A dialog box is a special menu that remains on the screen until all the necessary input has been supplied.

How do I open a dialogue box in Word? ›

When you first press Ctrl+O, Word displays an Open dialog box that provides several options at the left and the most recently opened documents to the right. (See Figure 1.)

What are modes of dialog? ›

The 7 Modes are:
  • Monologue. Where one speaker holds the floor. ...
  • Debate. Where different sides try to win the argument by beating the others' down. ...
  • Discussion. Where ideas are batted back and forth. ...
  • Conversation. ...
  • Skilful Conversation. ...
  • Dialogue. ...
  • Generative Dialogue.

Which key will open dialogue box? ›

Detailed Solution:

CTRL + F12 help to open dialogue box.

How do I save a dialog box? ›

On the File menu, click Save As to open the Save As dialog box. This lets you save a copy of the open project as a template or as a new project with a different name and location. The Save As dialog box is a standard Windows dialog box.

Which shortcut key is used to open the dialog box? ›

We can use the Ctrl and G or the F5 button in Windows to open the 'Go To' dialog box.

How do you get a window off screen? ›

Hold down the Shift key, then right-click on the appropriate application icon in the Windows taskbar. On the resulting pop-up, select the Move option. Begin pressing the arrow keys on your keyboard to move the invisible window from off-screen to on-screen.

Where is the dialog box in windows? ›

After accessing the tool/command to open a dialog box/window, press [Alt]+[Spacebar], then press M, then press any arrow key on your keyboard. This will “stick” the dialog box/window to your cursor. Move the mouse around until the dialog box/window is placed where you want it located.

What is the difference between dialogue box and menu? ›

Menus allow us to efficiently group/hide similar options together so that the screen does not become cluttered. Dialog Boxes allow us to momentarily take the user's attention away from the main window so as to obtain information or ask questions which are required at specific points in the application.

How do I type dialogue in Word? ›

Box simply click the Home tab in the ribbon. And then click the paragraph dialogue box launcher button in the lower right corner of the paragraph.

Where is the font dialog box in Word? ›

Right-click on the selected characters. A Context menu appears. Select Font from the Context menu. Word displays the Font tab of the Font dialog box appears.

What is the method used to activate the color dialog box? ›

Answer: The colour dialogue you can use the colour palette which is given in the computer otherwise you can create your by moderate the colours. To set the colour mainly you have to control some things like hue, saturation etc.

What is font dialog box? ›

The Font dialog box lets the user choose attributes for a logical font, such as font family and associated font style, point size, effects (underline, strikeout, and text color), and a script (or character set).

Is used to show the Colour Chooser dialogue box? ›

The JColorChooser class is used to create a color chooser dialog box so that user can select any color.

What is Print dialog box? ›

The Print dialog box lets the user select options for a particular print job. For example, the user can specify the printer to use, the range of pages to print, and the number of copies.

What are the types of dialog box? ›

There are 3 types of dialog boxes: modeless, modal, and system modal. Modal dialog boxes are generally used inside a program, to display messages, and to set program parameters.

What are dialog box controls? ›

A Dialog box is a temporary Window for an application that accepts user response through mouse or keyboard to open a file, save a file, notifications, alert messages, color, print, openfile dialog box, etc. It is also useful to create communication and interaction between the user and the application.

How do you use color dialog in Visual Basic? ›

Clicking on the Change Color button, the color dialog appears, select a color and click the OK button. The selected color will be applied as the forecolor of the text of the label.

How do I set font dialog box? ›

Step 1. We need to drag the Font Dialog box from the toolbox and drop it to the Windows form, as shown below. Step2: Once the Font Dialog is added to the form, we can set various properties of the Font by clicking on the Font Dialog box.

What is dialogue box in Visual Basic? ›

Dialog boxes are used to interact with the user and retrieve information. In simple terms, a dialog box is a form with its FormBorderStyle enumeration property set to FixedDialog . You can construct your own custom dialog boxes by using the Windows Forms Designer in Visual Studio.

What is the shortcut key to open dialog box? ›

CTRL + F12 help to open dialogue box.

What are the Microsoft colors? ›

The official Microsoft colors are orange red, green, blue, yellow and gray. We recommend using the Microsoft color palette for personal projects and in the case of commercial use to visit the company website. The color codes: RGB, CYMK for print, Hex for web and the Pantone colors can be seen below.

What is color chooser in OOP? ›

Use the JColorChooser class to enable users to choose from a palette of colors. A color chooser is a component that you can place anywhere within your program GUI. The JColorChooser API also makes it easy to bring up a dialog (modal or not) that contains a color chooser.

How do I open print dialog? ›

Alternatively, click (Down arrow) of the Start Printing button in the Edit and Print Clips screen and select Print Settings.... The Print Settings dialog box appears. The Print dialog box is used as an example in the following descriptions.

What are the five options that appear on print dialog box? ›

The five options that appear on the Print dialog box are Printer, Properties, Print Range, Copies, Options.

How do I disable the print dialog box? ›

How can I disable the Printer PopUp message?
  1. Start the Printer control applet (Start - Settings - Printers)
  2. From the File menu select "Server Properties"
  3. Select the Advanced tab.
  4. Uncheck the "Notify when remote documents are printer"
  5. Click OK.
  6. Reboot the computer.

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