BM_SETSTYLE Overview Group

An application sends a BM_SETSTYLE message to change the style of a button.

BM_SETSTYLE 

wParam =  (WPARAM) LOWORD(dwStyle); // style 

lParam =  MAKELPARAM(fRedraw, 0);   // redraw flag

Parameters

dwStyle: Value of wParam. Specifies the button style. For an explanation of button styles, see the following Remarks section.
fRedraw: Value of the low-order word of lParam. Specifies whether the button is to be redrawn. A value of TRUE redraws the button; a value of FALSE does not redraw the button.

Return Values

This message always returns zero.

Remarks

Following are the available button styles:

Style	Meaning
BS_3STATE	Creates a button that is the same as a check box, except that the box can be grayed as well as checked or unchecked. Use the grayed state to show that the state of the check box is not determined.
BS_AUTO3STATE	Creates a button that is the same as a three-state check box, except that the box changes its state when the user selects it. The state cycles through checked, grayed, and unchecked.
BS_AUTOCHECKBOX	Creates a button that is the same as a check box, except that the check state automatically toggles between checked and unchecked each time the user selects the check box.
BS_AUTORADIOBUTTON	Creates a button that is the same as a radio button, except that when the user selects it, Windows automatically sets the button’s check state to checked and automatically sets the check state for all other buttons in the same group to unchecked.
BS_CHECKBOX	Creates a small, empty check box with text. By default, the text is displayed to the right of the check box. To display the text to the left of the check box, combine this flag with the BS_LEFTTEXT style (or with the equivalent BS_RIGHTBUTTON style).
BS_DEFPUSHBUTTON	Creates a push button that behaves like a BS_PUSHBUTTON style button, but also has a heavy black border. If the button is in a dialog box, the user can select the button by pressing the ENTER key, even when the button does not have the input focus. This style is useful for enabling the user to quickly select the most likely (default) option.
BS_GROUPBOX	Creates a rectangle in which other controls can be grouped. Any text associated with this style is displayed in the rectangle’s upper left corner.
BS_LEFTTEXT	Places text on the left side of the radio button or check box when combined with a radio button or check box style. Same as the BS_RIGHTBUTTON style.
BS_OWNERDRAW	Creates an owner-drawn button. The owner window receives a WM_MEASUREITEM message when the button is created and a WM_DRAWITEM message when a visual aspect of the button has changed. Do not combine the BS_OWNERDRAW style with any other button styles.
BS_PUSHBUTTON	Creates a push button that posts a WM_COMMAND message to the owner window when the user selects the button.
BS_RADIOBUTTON	Creates a small circle with text. By default, the text is displayed to the right of the circle. To display the text to the left of the circle, combine this flag with the BS_LEFTTEXT style (or with the equivalent BS_RIGHTBUTTON style). Use radio buttons for groups of related, but mutually exclusive choices.
BS_USERBUTTON	Obsolete, but provided for compatibility with 16-bit versions of Windows. Win32-based applications should use BS_OWNERDRAW instead.
BS_BITMAP	Specifies that the button displays a bitmap.
BS_BOTTOM	Places text at the bottom of the button rectangle.
BS_CENTER	Centers text horizontally in the button rectangle.
BS_ICON	Specifies that the button displays an icon.
BS_LEFT	Left-justifies the text in the button rectangle. However, if the button is a check box or radio button that does not have the BS_RIGHTBUTTON style, the text is left justified on the right side of the check box or radio button.
BS_MULTILINE	Wraps the button text to multiple lines if the text string is too long to fit on a single line in the button rectangle.
BS_NOTIFY	Enables a button to send BN_DBLCLK, BN_KILLFOCUS, and BN_SETFOCUS notification messages to its parent window. Note that buttons send the BN_CLICKED notification message regardless of whether it has this style.
BS_PUSHLIKE	Makes a button (such as a check box, three-state check box, or radio button) look and act like a push button. The button looks raised when it isn’t pushed or checked, and sunken when it is pushed or checked.
BS_RIGHT	Right-justifies text in the button rectangle. However, if the button is a check box or radio button that does not have the BS_RIGHTBUTTON style, the text is right justified on the right side of the check box or radio button.
BS_RIGHTBUTTON	Positions a radio button’s circle or a check box’s square on the right side of the button rectangle. Same as the BS_LEFTTEXT style.
BS_TEXT	Specifies that the button displays text.
BS_TOP	Places text at the top of the button rectangle.
BS_VCENTER	Places text in the middle (vertically) of the button rectangle.

BM_SETSTYLE Overview Group

Parameters

Return Values

Remarks

See Also

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