1.创建控件时，添加自绘属性 2.在SDK中 WM_DRAWITEM是控件的父窗口响应的 3.响应WM_DRAWITEM，根据DRAWITEMSTRUCT里的参数进行绘制MSDN中有描述:DRAWITEMSTRUCT Structure--------------------------------------------------------------------------------Provides necessary information the owner window to determine how to paint an owner-drawn control or menu item. The owner window of the owner-drawn control or menu item receives a pointer to this structure as the lParam parameter of the WM_DRAWITEM message.Syntaxtypedef struct tagDRAWITEMSTRUCT { UINT CtlType; UINT CtlID; UINT itemID; UINT itemAction; UINT itemState; HWND hwndItem; HDC hDC; RECT rcItem; ULONG_PTR itemData; } DRAWITEMSTRUCT; MembersCtlType The control type. This member can be one of the following values. See Res. ODT_BUTTON Owner-drawn button ODT_COMBOBOX Owner-drawn combo box ODT_LISTBOX Owner-drawn list box ODT_LISTVIEW List-view control ODT_MENU Owner-drawn menu item ODT_STATIC Owner-drawn static control ODT_TAB Tab control CtlID The identifier of the combo box, list box, button, or static control. This member is not used for a menu item. itemID The menu item identifier for a menu item or the index of the item in a list box or combo box. For an empty list box or combo box, this member can be -1. This allows the application to draw only the focus rectangle at the coordinates specified by the rcItem member even though there are no items in the control. This indicates to the user whether the list box or combo box has the focus. How the bits are set in the itemAction member determines whether the rectangle is to be drawn as though the list box or combo box has the focus. itemAction The required drawing action. This member can be one or more of the values. ODA_DRAWENTIRE The entire control needs to be drawn. ODA_FOCUS The control has lost or gained the keyboard focus. The itemState member should be checked to determine whether the control has the focus. ODA_SELECT The selection status has changed. The itemState member should be checked to determine the new selection state. itemState The visual state of the item after the current drawing action takes place. This member can be a combination of the values shown in the following table. ODS_CHECKED The menu item is to be checked. This bit is used only in a menu. ODS_COMBOBOXEDIT The drawing takes place in the selection field (edit control) of an owner-drawn combo box. ODS_DEFAULT The item is the default item. ODS_DISABLED The item is to be drawn as disabled. ODS_FOCUS The item has the keyboard focus. ODS_GRAYED The item is to be grayed. This bit is used only in a menu. ODS_HOTLIGHT Windows 98/Me, Windows 2000/XP: The item is being hot-tracked, that is, the item will be highlighted when the mouse is on the item. ODS_INACTIVE Windows 98/Me, Windows 2000/XP: The item is inactive and the window associated with the menu is inactive. ODS_NOACCEL Windows 2000/XP: The control is drawn without the keyboard accelerator cues. ODS_NOFOCUSRECT Windows 2000/XP: The control is drawn without focus indicator cues. ODS_SELECTED The menu item's status is selected. hwndItem A handle to the control for combo boxes, list boxes, buttons, and static controls. For menus, this member is a handle to the menu that contains the item. hDC A handle to a device context; this device context must be used when performing drawing operations on the control. rcItem A rectangle that defines the boundaries of the control to be drawn. This rectangle is in the device context specified by the hDC member. The system automatically clips anything that the owner window draws in the device context for combo boxes, list boxes, and buttons, but does not clip menu items. When drawing menu items, the owner window must not draw outside the boundaries of the rectangle defined by the rcItem member. itemData The application-defined value associated with the menu item. For a control, this parameter specifies the value last assigned to the list box or combo box by the LB_SETITEMDATA or CB_SETITEMDATA message. If the list box or combo box has the LBS_HASSTRINGS or CBS_HASSTRINGS style, this value is initially zero. Otherwise, this value is initially the value that was passed to the list box or combo box in the lParam parameter of one of the following messages: CB_ADDSTRING CB_INSERTSTRING LB_ADDSTRING LB_INSERTSTRING If CtlType is ODT_BUTTON or ODT_STATIC, itemData is zero. ResSome control types, such as status bars, do not set the value of CtlType.
接上面的: WM_DRAWITEM Notification-------------------------------------------------------------------------------- The WM_DRAWITEM message is sent to the parent 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.A window receives this message through its WindowProc function. Syntax WM_DRAWITEM WPARAM wParam lpDrawItem = (LPDRAWITEMSTRUCT) lParam;
ParameterswParam Specifies the identifier of the control that sent the WM_DRAWITEM message. If the message was sent by a menu, this parameter is zero. lpDrawItem Pointer to a DRAWITEMSTRUCT structure containing information about the item to be drawn and the type of drawing required. Return ValueIf an application processes this message, it should return TRUE. ResBy default, the DefWindowProc function draws the focus rectangle for an owner-drawn list box item. The itemAction member of the DRAWITEMSTRUCT structure specifies the drawing operation that an application should perform. Before returning from processing this message, an application should ensure that the device context identified by the hDC member of the DRAWITEMSTRUCT structure is in the default state.
应该是动态创建的吧
创建的时候属性里加上OwnDraw属性
另外用MFC自绘时类似WM_DRAWITEM属性是控件本身响应的
不是主窗口
combobox 风格里面有个CBS_OWNERDRAWVARIABLE风格，我添上了。是在主窗体的消息响应函数中响应不到WM_DRAWITEM消息，如果不是主窗体响应，那在哪里响应？
用MFC是在自己继承的CCombox类响应的
参考这个
2.在SDK中 WM_DRAWITEM是控件的父窗口响应的
3.响应WM_DRAWITEM，根据DRAWITEMSTRUCT里的参数进行绘制MSDN中有描述:DRAWITEMSTRUCT Structure--------------------------------------------------------------------------------Provides necessary information the owner window to determine how to paint an owner-drawn control or menu item. The owner window of the owner-drawn control or menu item receives a pointer to this structure as the lParam parameter of the WM_DRAWITEM message.Syntaxtypedef struct tagDRAWITEMSTRUCT {
UINT CtlType;
UINT CtlID;
UINT itemID;
UINT itemAction;
UINT itemState;
HWND hwndItem;
HDC hDC;
RECT rcItem;
ULONG_PTR itemData;
} DRAWITEMSTRUCT;
MembersCtlType
The control type. This member can be one of the following values. See Res.
ODT_BUTTON
Owner-drawn button
ODT_COMBOBOX
Owner-drawn combo box
ODT_LISTBOX
Owner-drawn list box
ODT_LISTVIEW
List-view control
ODT_MENU
Owner-drawn menu item
ODT_STATIC
Owner-drawn static control
ODT_TAB
Tab control
CtlID
The identifier of the combo box, list box, button, or static control. This member is not used for a menu item.
itemID
The menu item identifier for a menu item or the index of the item in a list box or combo box. For an empty list box or combo box, this member can be -1. This allows the application to draw only the focus rectangle at the coordinates specified by the rcItem member even though there are no items in the control. This indicates to the user whether the list box or combo box has the focus. How the bits are set in the itemAction member determines whether the rectangle is to be drawn as though the list box or combo box has the focus.
itemAction
The required drawing action. This member can be one or more of the values.
ODA_DRAWENTIRE
The entire control needs to be drawn.
ODA_FOCUS
The control has lost or gained the keyboard focus. The itemState member should be checked to determine whether the control has the focus.
ODA_SELECT
The selection status has changed. The itemState member should be checked to determine the new selection state.
itemState
The visual state of the item after the current drawing action takes place. This member can be a combination of the values shown in the following table.
ODS_CHECKED
The menu item is to be checked. This bit is used only in a menu.
ODS_COMBOBOXEDIT
The drawing takes place in the selection field (edit control) of an owner-drawn combo box.
ODS_DEFAULT
The item is the default item.
ODS_DISABLED
The item is to be drawn as disabled.
ODS_FOCUS
The item has the keyboard focus.
ODS_GRAYED
The item is to be grayed. This bit is used only in a menu.
ODS_HOTLIGHT
Windows 98/Me, Windows 2000/XP: The item is being hot-tracked, that is, the item will be highlighted when the mouse is on the item.
ODS_INACTIVE
Windows 98/Me, Windows 2000/XP: The item is inactive and the window associated with the menu is inactive.
ODS_NOACCEL
Windows 2000/XP: The control is drawn without the keyboard accelerator cues.
ODS_NOFOCUSRECT
Windows 2000/XP: The control is drawn without focus indicator cues.
ODS_SELECTED
The menu item's status is selected.
hwndItem
A handle to the control for combo boxes, list boxes, buttons, and static controls. For menus, this member is a handle to the menu that contains the item.
hDC
A handle to a device context; this device context must be used when performing drawing operations on the control.
rcItem
A rectangle that defines the boundaries of the control to be drawn. This rectangle is in the device context specified by the hDC member. The system automatically clips anything that the owner window draws in the device context for combo boxes, list boxes, and buttons, but does not clip menu items. When drawing menu items, the owner window must not draw outside the boundaries of the rectangle defined by the rcItem member.
itemData
The application-defined value associated with the menu item. For a control, this parameter specifies the value last assigned to the list box or combo box by the LB_SETITEMDATA or CB_SETITEMDATA message. If the list box or combo box has the LBS_HASSTRINGS or CBS_HASSTRINGS style, this value is initially zero. Otherwise, this value is initially the value that was passed to the list box or combo box in the lParam parameter of one of the following messages:
CB_ADDSTRING
CB_INSERTSTRING
LB_ADDSTRING
LB_INSERTSTRING
If CtlType is ODT_BUTTON or ODT_STATIC, itemData is zero.
ResSome control types, such as status bars, do not set the value of CtlType.
WM_DRAWITEM Notification--------------------------------------------------------------------------------
The WM_DRAWITEM message is sent to the parent 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.A window receives this message through its WindowProc function.
Syntax
WM_DRAWITEM WPARAM wParam
lpDrawItem = (LPDRAWITEMSTRUCT) lParam;
ParameterswParam
Specifies the identifier of the control that sent the WM_DRAWITEM message. If the message was sent by a menu, this parameter is zero.
lpDrawItem
Pointer to a DRAWITEMSTRUCT structure containing information about the item to be drawn and the type of drawing required.
Return ValueIf an application processes this message, it should return TRUE. ResBy default, the DefWindowProc function draws the focus rectangle for an owner-drawn list box item. The itemAction member of the DRAWITEMSTRUCT structure specifies the drawing operation that an application should perform. Before returning from processing this message, an application should ensure that the device context identified by the hDC member of the DRAWITEMSTRUCT structure is in the default state.
virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);