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分享我写了一个继承自CStatic的类，但却没有虚函数DrawItem供覆盖，怎么回事？
class CMyStatic : public CStatic
在用ClassWizard添加虚函数时，没有看到DrawItem,
可是继承自CButton的类就可以改写这个函数，why??
在用ClassWizard添加虚函数时，没有看到DrawItem,
可是继承自CButton的类就可以改写这个函数，why??
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yuefeng521521521 2003-09-17
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to bcpl(闲庭信步)
你的那个改写虚函数的方法好使，我试过了
谢谢
你的那个改写虚函数的方法好使，我试过了
谢谢
bcpl 2003-09-17
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封装性不好，还是用OnChildNotify比较好
xghost 2003-09-17
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CStatic::DrawItem 虚函数可能在 VS.NET 的MFC中使用的，不知是否这样...
xghost 2003-09-17
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Owner-Drawn Static Control
By using the SS_OWNERDRAW style, an application can take responsibility for painting a static control. The parent window of an owner-drawn static control (its owner) receives a WM_DRAWITEM message whenever the static control needs to be painted. The message includes the address of a DRAWITEMSTRUCT structure that contains information that the owner window uses when drawing the control.
按上面的说法，你在父窗口拦截WM_DRAWITEM 消息就可以自绘Static Control 了
By using the SS_OWNERDRAW style, an application can take responsibility for painting a static control. The parent window of an owner-drawn static control (its owner) receives a WM_DRAWITEM message whenever the static control needs to be painted. The message includes the address of a DRAWITEMSTRUCT structure that contains information that the owner window uses when drawing the control.
按上面的说法，你在父窗口拦截WM_DRAWITEM 消息就可以自绘Static Control 了
bcpl 2003-09-17
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我的是October 2001
flinming 2003-09-17
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学习。。。。。。。。。。。。。
yuefeng521521521 2003-09-17
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我的MSDN版本为：January 2002
xghost 2003-09-17
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CStatic类没有DrawItem虚函数
yuefeng521521521 2003-09-17
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查CStatic类的Class Member
最后一个函数就是
Overridables
DrawItem Override to draw an owner-drawn static control.
CStatic::DrawItem
Called by the framework to draw an owner-drawn static control.
virtual void DrawItem(
LPDRAWITEMSTRUCT lpDrawItemStruct
);
最后一个函数就是
Overridables
DrawItem Override to draw an owner-drawn static control.
CStatic::DrawItem
Called by the framework to draw an owner-drawn static control.
virtual void DrawItem(
LPDRAWITEMSTRUCT lpDrawItemStruct
);
bcpl 2003-09-17
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可是我在MSDN中看到了CStatic类的DrawItem虚函数了啊！？
我查不到..
我查不到..
bcpl 2003-09-17
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看来我说错了，上面的列表中就有ODT_STATIC（：（），static也可以有SS_OWNERDRAW风格，只是MFC没帮你加DrawItem虚函数，要自己加
1. 改写虚函数OnChildNotify
BOOL CMyStatic::OnChildNotify(UINT message, WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
if (message != WM_DRAWITEM)
return CWnd::OnChildNotify(message, wParam, lParam, pResult);
ASSERT(pResult == NULL); // no return value expected
UNUSED(pResult); // unused in release builds
DrawItem((LPDRAWITEMSTRUCT)lParam);
return TRUE;
}
2. 加上成员函数
void DrawItem (LPDRAWITEMSTRUCT lpDrawItemStruct)
{
// 在这里自画
}
1. 改写虚函数OnChildNotify
BOOL CMyStatic::OnChildNotify(UINT message, WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
if (message != WM_DRAWITEM)
return CWnd::OnChildNotify(message, wParam, lParam, pResult);
ASSERT(pResult == NULL); // no return value expected
UNUSED(pResult); // unused in release builds
DrawItem((LPDRAWITEMSTRUCT)lParam);
return TRUE;
}
2. 加上成员函数
void DrawItem (LPDRAWITEMSTRUCT lpDrawItemStruct)
{
// 在这里自画
}
yuefeng521521521 2003-09-17
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可是我在MSDN中看到了CStatic类的DrawItem虚函数了啊！
CStatic MembersSee Also
CStatic Overview | Hierarchy Chart
Base Class Members
CObject Members
CCmdTarget Members
CWnd Members
。。。
Overridables
DrawItem Override to draw an owner-drawn static control.
CStatic MembersSee Also
CStatic Overview | Hierarchy Chart
Base Class Members
CObject Members
CCmdTarget Members
CWnd Members
。。。
Overridables
DrawItem Override to draw an owner-drawn static control.
bcpl 2003-09-17
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DrawItem并不是通用的CWnd虚函数，只适用于可拥有自画风格（会发送WM_DRAWITEM消息）的控件：
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
对于static控件，可以通过处理WM_PAINT实现自画
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
对于static控件，可以通过处理WM_PAINT实现自画
