MFC：更改CEdit的颜色 [英] MFC: Changing the colour of CEdit

问题描述

男人，有人可以给我一个简短的运行过程如何在运行时改变CEdit控件的背景颜色？

Guys, can someone give me a brief run through of how to change the background colour of a CEdit control at runtime? I want to be able to change the background to red if the field is zero length and the normal white otherwise.

推荐答案

如果字段长度为零，那么我想将背景更改为红色。

You cannot do it with a plain CEdit, you need to override a few bits.

实现自己的ON_WM_CTLCOLOR_REFLECT处理程序，然后在处理程序中返回彩色的CBrush：

Implement your own ON_WM_CTLCOLOR_REFLECT handler, then return your coloured CBrush in the handler:

（大致来说，你需要把常用的资源管理放在里面，rememebr在析构函数中删除你的画笔）

(roughly, you'll need to put the usual resource management in there, rememebr to delete your brush in the destructor)

class CColorEdit : public CEdit
{
  ....
  CBrush   m_brBkgnd;
  afx_msg HBRUSH CtlColor(CDC* pDC, UINT nCtlColor)
  {
    m_brBkgnd.DeleteObject();
    m_brBkgnd.CreateSolidBrush(nCtlColor);
  }
}

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