SASTPH@vm.sas.com (Tim Hunter) (05/24/91)
Apparently there are two kinds of "owner draw" buttons in Windows 3.0. Petzold documents the BS_USERBUTTON style but not the BS_OWNERDRAW style. The SDK documentation describes the BS_OWNERDRAW style but not the BS_USERBUTTON style. The BS_USERBUTTON style seems slightly less functional. I'm new to Windows programming, but my guess is that the BS_USERBUTTON style was present in earlier releases of Windows and has been superceded by the BS_OWNERDRAW style. Am I right? Does anybody know some history behind the two styles? More importantly, is there any reason to prefer the BS_OWNERDRAW style if the BS_USERBUTTON style provides sufficient functionality? Known bugs, etc.?
Gary_Capps@p27.f30.n147.z1.fidonet.org (Gary Capps) (05/30/91)
In a message of <23 May 91 22:47:39> Tim Hunter wrote to All: TH>I'm new to Windows programming, but my guess is that the BS_USERBUTTON TH>style was present in earlier releases of Windows and has been superceded TH>by the BS_OWNERDRAW style. Am I right? Bingo. TH>behind the two styles? More importantly, is there any reason to prefer TH>the BS_OWNERDRAW style if the BS_USERBUTTON style provides sufficient TH>functionality? Known bugs, etc.? The difference is primarily in how the button talks to its parent. The BS_USERBUTTON sends WM_COMMAND messages with BN_xxxx notifications in wParam while the BS_OWNERDRAW button sends WM_DRAWITEM and WM_MEASUREITEM messages with lParam pointing to control structures that contain the button's hDC, client rectangle, status bits, etc. You should stick to BS_OWNERDRAW buttons, 'cause there's probably a better than even chance that the BS_USERBUTTON will be phased out. gc