[英]Handling WM_PAINT in a Subclassed CStatic Control
I created a custom control whose class has CStatic
as base class. 我创建了一个自定义控件,其类具有CStatic
作为基类。 Currently I handle the drawing using WM_PAINT
event. 目前,我使用WM_PAINT
事件处理图形。 But there is a strange behavior. 但是有一个奇怪的行为。 When I re-enable the window after disabling it using CWnd::EnableWindow
function, it refuses to draw what I written in OnPaint
function. 当我使用CWnd::EnableWindow
函数禁用窗口后重新启用窗口时,它拒绝绘制我在OnPaint
函数中编写的内容。 It draws the static control instead. 它绘制静态控件。
I agree that there is this standard method of overriding DrawItem
and using SS_OWNERDRAW
style. 我同意存在这种覆盖DrawItem
并使用SS_OWNERDRAW
样式的标准方法。 But what's wrong with WM_PAINT
? 但是WM_PAINT
什么问题?
void XXControl::OnPaint()
{
CPaintDC PaintDC( this );
// ** draw the control to PaintDC**
}
Here is exactly what I have written: 这正是我写的:
class CMyStatic : public CStatic
{
DECLARE_MESSAGE_MAP()
public:
void OnPaint(void);
};
BEGIN_MESSAGE_MAP(CMyStatic, CStatic)
ON_WM_PAINT()
END_MESSAGE_MAP()
void CMyStatic::OnPaint(void)
{
CPaintDC dc(this);
CRect rect;
GetClientRect(&rect);
dc.FillSolidRect(&rect, RGB(120,255,0));
}
And subclassed: 并细分为:
class CMyDlg : public CDialog
{
// Construction
CMyStatic my_static;
...
};
BOOL CCMyDlg::OnInitDialog()
{
CDialog::OnInitDialog();
my_static.SubclassDlgItem(IDC_DRAW, this);
return true;
}
Where IDC_DRAW
is static control on resource for this dialog. 其中IDC_DRAW
是此对话框的资源静态控件。 I wrote two button handlers: 我写了两个按钮处理程序:
void CMyDlg::OnBnClickedOk()
{
my_static.EnableWindow(FALSE);
my_static.Invalidate();
}
void CMyDlg::OnBnClickedOk2()
{
my_static.EnableWindow();
my_static.Invalidate();
}
And it works flawlessly! 而且它可以完美地工作! Remove Invalidate
call and it would fail. 删除Invalidate
呼叫,它将失败。
Try turning off Aero. 尝试关闭Aero。 I'm having a similiar problem where I'm drawing a static control and when it goes from disabled to enabled the WM_PAINT message is never received, but if I turn Aero off it works fine. 我遇到了一个类似的问题:正在绘制一个静态控件,当它从禁用状态变为启用状态时,永远不会收到WM_PAINT消息,但是如果我关闭Aero,它就可以正常工作。
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