CUSTOMDRAW和OwnerDraw
1.Owner Draw
当Button控件被设置成OwnerDraw属性时,父窗体就会接受到WM_DRAWITEM、WM_MEASUREITEM、WM_COMPAREITEM、WM_DELETEITEM四个消息。
除了Button空间外,还有ListBox控件设置CBS_OWNERDRAWVARIABLE属性。
The WM_DRAWITEM message is sent to the owner window of an owner-drawn button, combo box, list box, or menu when a visual aspect of the button, combo box, list box, or menu has changed.
在MFC中,已经将这个4个消息反射到子控件的类中,如
void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct); void MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct); int CompareItem(LPCOMPAREITEMSTRUCT lpCompareItemStruct); void DeleteItem(LPDELETEITEMSTRUCT lpDeleteItemStruct);
2.Custom Draw
如下控件都支持Custom Draw。
父窗体会收到NM_CUSTOMDRAW的通知消息。即
WM_NOTIFY idCtrl = (int) wParam;
pnmh = (LPNMHDR) lParam;
typedef struct tagNMHDR { HWND hwndFrom; UINT idFrom; UINT code; //通知消息码 } NMHDR;
当控制码是NM_CUSTOMDRAW时候
#ifdef LIST_VIEW_CUSTOM_DRAW
lpNMCustomDraw = (LPNMLVCUSTOMDRAW) lParam;
#elif TOOL_TIPS_CUSTOM_DRAW
lpNMCustomDraw = (LPNMTTCUSTOMDRAW) lParam;
#elif TREE_VIEW_CUSTOM_DRAW
lpNMCustomDraw = (LPNMTVCUSTOMDRAW) lParam;
#elif TOOL_BAR_CUSTOM_DRAW
lpNMCustomDraw = (LPNMTBCUSTOMDRAW) lParam;
#else
lpNMCustomDraw = (LPNMCUSTOMDRAW) lParam;
#endif
lpNMCustomDraw->dwDrawStage有如下几种可能
Global Values
Description
CDDS_POSTERASE
After the erasing cycle is complete.
CDDS_POSTPAINT
After the painting cycle is complete.
CDDS_PREERASE
Before the erasing cycle begins.
CDDS_PREPAINT
Before the painting cycle begins.
Item-specific Values
Description
CDDS_ITEM
Indicates that the dwItemSpec, uItemState, and lItemlParam members are valid.
CDDS_ITEMPOSTERASE
After an item has been erased.
CDDS_ITEMPOSTPAINT
After an item has been drawn.
CDDS_ITEMPREERASE
Before an item is erased.
CDDS_ITEMPREPAINT
Before an item is drawn.
CDDS_SUBITEM
Version 4.71. Flag combined with CDDS_ITEMPREPAINT or CDDS_ITEMPOSTPAINT if a subitem is being drawn. This will only be set if CDRF_NOTIFYITEMDRAW is returned from CDDS_PREPAINT.
在MFC或WTL中,已经反射到子控件,并封装好如下函数
DWORD OnPrePaint(int idCtrl, LPNMCUSTOMDRAW lpNMCD); DWORD OnPostPaint(int idCtrl, LPNMCUSTOMDRAW lpNMCD); DWORD OnPreErase(int idCtrl, LPNMCUSTOMDRAW lpNMCD); DWORD OnPostErase(int idCtrl, LPNMCUSTOMDRAW lpNMCD); DWORD OnItemPrePaint(int idCtrl, LPNMCUSTOMDRAW lpNMCD); DWORD OnItemPostPaint(int idCtrl, LPNMCUSTOMDRAW lpNMCD); DWORD OnItemPreErase(int idCtrl, LPNMCUSTOMDRAW lpNMCD); DWORD OnItemPostEraset(int idCtrl, LPNMCUSTOMDRAW lpNMCD); DWORD OnSubItemPrePaint(int idCtrl, LPNMCUSTOMDRAW lpNMCD);