BUTTON按钮怎么不见了？

[zoulie]

我在属性的Styles中的Owner_draw选中，然后运行按钮怎么就不见了？怎么回事？

[LordSimon]

owner-drawn control
A predefined control that sends messages to its parent window when it must be drawn.

[LordSimon]

owner-drawn button
A button with the style BS_OWNERDRAW. Unlike all other button types, an owner-drawn button has no predefined appearance or behavior. Also, the application, not the system, is responsible for painting it.
很简单，不用在下翻译了吧，呵呵

[wshcdr]

选择了Owner_draw属性,必须自己去画这个按纽
去看MSDN中 WM_DRAWITEM

[zoulie]

结帖

[zoulie]

我的意思是让按钮被点击后改变字体的颜色,但是加了Owner_draw属性后不点击它又看不见,

[zoulie]

代码如下:

void CCOLORBTN::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
// TODO: Add your code to draw the specified item

if(m_flag==1)
{
UINT uStyle=DFCS_PUSHED;
ASSERT(lpDrawItemStruct->CtlType==ODT_BUTTON);
if(lpDrawItemStruct->itemState & ODS_SELECTED)
uStyle |=DFCS_PUSHED;
::DrawFrameControl(lpDrawItemStruct->hDC,&lpDrawItemStruct->rcItem,
DFC_BUTTON,uStyle);
CString strText;
GetWindowText(strText);
COLORREF crOldColor= ::SetTextColor(lpDrawItemStruct->hDC,RGB(255,0,0));
::DrawText(lpDrawItemStruct->hDC,strText,strText.GetLength(),
&lpDrawItemStruct->rcItem,DT_SINGLELINE|DT_VCENTER|DT_CENTER);
::SetTextColor(lpDrawItemStruct->hDC,crOldColor);
}

}

void CCOLORBTN::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
m_flag=1;
CButton::OnLButtonDown(nFlags, point);
}

[hj008]

你把MSDN的代码,关于BUTTON的DrowItem里的范例COPY过来,跟你的对对就知道了.

[femalelover]

先别结呀,我也遇到这个问题,在Debug下运行出错,但Release下可以运行,却不显示出来.也是OwnerDraw属性的问题.

[femalelover]

说说看怎么解决的.

[zoulie]

一定要重载DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)才能运行时也显示出来,我加的代码如下.Mackz(在相互)所说的,我分给完了,不好意思啊,下次再给 :-)

void CColorBtn::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
// TODO: Add your code to draw the specified item
if(m_flag==1) //显示红色的文本
{
UINT uStyle=DFCS_BUTTONPUSH;
ASSERT(lpDrawItemStruct->CtlType==ODT_BUTTON);
if(lpDrawItemStruct->itemState & ODS_SELECTED)
uStyle |=DFCS_PUSHED;
::DrawFrameControl(lpDrawItemStruct->hDC,&lpDrawItemStruct->rcItem,
DFC_BUTTON,uStyle);
CString strText;
GetWindowText(strText);
COLORREF crOldColor= ::SetTextColor(lpDrawItemStruct->hDC,RGB(255,0,0));
::DrawText(lpDrawItemStruct->hDC,strText,strText.GetLength(),
&lpDrawItemStruct->rcItem,DT_SINGLELINE|DT_VCENTER|DT_CENTER);
::SetTextColor(lpDrawItemStruct->hDC,crOldColor);
}

else //默认显示色
{
UINT uStyle=DFCS_BUTTONPUSH ;
ASSERT(lpDrawItemStruct->CtlType==ODT_BUTTON);
if(lpDrawItemStruct->itemState & ODS_SELECTED)
uStyle |=DFCS_PUSHED;
::DrawFrameControl(lpDrawItemStruct->hDC,&lpDrawItemStruct->rcItem,
DFC_BUTTON,uStyle);
CString strText;
GetWindowText(strText);
COLORREF crOldColor= ::SetTextColor(lpDrawItemStruct->hDC,RGB(0,0,0));
::DrawText(lpDrawItemStruct->hDC,strText,strText.GetLength(),
&lpDrawItemStruct->rcItem,DT_SINGLELINE|DT_VCENTER|DT_CENTER);
::SetTextColor(lpDrawItemStruct->hDC,crOldColor);
}

}

[zoulie]

搞了半夜,总算搞定了,谢楼上几位..

[菜牛]

if(m_flag==1)
{
}
else
{
}
就是说在你鼠标按下之前也要绘制一个按钮的东西。

[ningxuelengyue]

能不能说详细点，把代码贴上来看看

[r_s]

mark

[chinanb]

改以下STYL属性，就可以加按钮颜色