摘要：①BUTTON_IMAGELISTContains information about an image list that is used with a button control②BUTTON_SPLITINFOContains information that defines a split button (BS_SPLITBUTTON and BS_DEFSPLITBUTTON styles)③NMBCDROPDOWNContains information about a BCN_DROPDOWN notification④NMBCHOTITEMContains informati 阅读全文

摘要：①BCN_DROPDOWNSent when the user clicks a drop down arrow on a button. The parent window of the control receives this notification code in the form of a WM_NOTIFY message②BCN_HOTITEMCHANGENotifies the button control owner that the mouse is entering or leaving the client area of the button control. Th 阅读全文

摘要：①BCM_GETIDEALSIZEGets the size of the button that best fits its text and image, if an image list is present. You can send this message explicitly or use the Button_GetIdealSize macro②BCM_GETIMAGELISTGets the BUTTON_IMAGELIST structure that describes the image list assigned to a button control. You c 阅读全文