如何更改MFC中复选框的背景颜色？

问题描述

我正在设计一个使用复选框的GUI。我需要chechbox的颜色，即黑色标记出现的区域，在选中框时更改。



我尝试过的方法：



我读到了各种在线接触，建议使用 WM_CTLCOLOR 消息并使用 OnCtlColor 函数，但这会在初始化时立即改变颜色。所以我做的是尝试在选中框时更改颜色，如下所示：

I am designing a GUI that makes use of a checkbox. I need the colour of the chechbox, i.e. the area where the black tick appears, to change when the box is checked.

What I have tried:

I read about various approached online which suggest using the WM_CTLCOLOR message and using the OnCtlColor function, but this changes the colour immediately on initialisation. So what I did was to try and change the colour when the box is checked as follows:

void CMyAppDlg::OnBnClickedCheckTxpow()
{
	if (m_chkTxPow.GetState() == 9)
	{
		CDC *pDC;
		CWnd *pWnd;

		//pWnd->SetDlgCtrlID(IDC_CHECK_TXPOW);
		pDC = m_chkTxPow.GetDC();
		pDC->SetBkColor(RGB(0,255,0));
	}
}

m_chkTxPow 是一个控件分配给复选框的变量。我试图尽可能地模拟在线提供的 OnCtlColor 功能。但是这不起作用。

我也不认为改变背景颜色会影响盒子里面的颜色。有人可以帮我吗？

m_chkTxPow is a control variable assigned to the check box. I was trying to emulate the OnCtlColor functions available online as closely as possible. But this does not work.
Also I don't think changing the background colour affects the colour inside the box. Could anyone help me here?

推荐答案

// Draw default sized check box.
// Classic        Themed
//
// LLLLLLLLLLLLW  BBBBBBBBBBBBB
// LGGGGGGGGGGSW  B           B
// LG         SW  B           B
// LG       K SW  B        G  B
// LG      KK SW  B       GG  B
// LG K   KKK SW  B  G	 GGG  B
// LG KK KKK  SW  B  GG GGG   B
// LG KKKKK   SW  B  GGGGG    B
// LG  KKK    SW  B   GGG     B
// LG   K     SW  B    G      B
// LSSSSSSSSSSSW  B           B
// WWWWWWWWWWWWW  BBBBBBBBBBBBB
//
// L = light gray, G = dark gray, S =very light gray, B/K = black, W = white
//
// rcBox:  Rect containing the check box
// clrBk:  Background colour
// clrArr: Colour for arrow (COLOR_BTNSHADOW if disabled; else COLOR_WINDOWTEXT)

// save bk color; is changed by drawing functions
int nBkClr = pDC->GetBkColor();

#if 1
// Add aditional states (inactive, pushed) as required
pDC->DrawFrameControl(rcBox, DFC_BUTTON, DFCS_BUTTONCHECK);
#else
// Themed (set nThemedState accordingly):
DrawThemeBackground(m_hTheme,
    lpDrawItemStruct->hDC,
    BP_CHECKBOX, nThemedState,
    &rcBox, NULL);
#endif

CRect rcBk(rcBox);
// Use -3 when themed and CBS_UNCHECKEDHOT
rcBk.InflateRect(-2, -2);
#if 1
pDC->FillSolidRect(&rcBk, clrBk);
#else
// Themed:
// Two triangles: upper left and lower right
static GRADIENT_TRIANGLE TriG[2] = { { 0, 1, 3 }, { 0, 3, 2} };
#define GetR(rgb)   ((int)((rgb) & 0xFF)) // extract R/G/B values fro COLORREF
#define GetG(rgb)   ((int)(((rgb) >> 8) & 0xFF))
#define GetB(rgb)   ((int)(((rgb) >> 16) & 0xFF))
#define Darken(a)   ((a) - ((a) >> 1)) // make R/G/B part darker
#define Brighten(a) ((a) + ((0xFF - (a)) >> 1))	// make R/G/B part brighter
#define Col16(c)    ((COLOR16)((c) << 8)) // convert R/G/B part to COLOR16 value
#define Bright16(a) (Col16(Brighten(a)))
TRIVERTEX TriV[4] = {
{rc.left, rc.top, Col16(GetR(clr)), Col16(GetG(clr)), Col16(GetB(clr)), 0},
{rc.right, rc.top, Bright16(GetR(clr)), Bright16(GetG(clr)), Bright16(GetB(clr)), 0},
{rc.left, rc.bottom, Bright16(GetR(clr)), Bright16(GetG(clr)), Bright16(GetB(clr)), 0},
{rc.right, rc.bottom, 0xff00, 0xff00, 0xff00, 0}
};
pDC->GradientFill(TriV, 4, TriG, 2, GRADIENT_FILL_TRIANGLE);
#endif

// Themed: clrArr = RGB(76, 97, 152); // not shaded!
CRect rcArr(rcBox.left + 3, // left start position
    rcBox.top + 5, // top start position
    rcBox.left + 4, // width 1 pixel
    rcBox.top + 8); // height 3 pixels
for (int i = 0; i < 7; i++)
{
    pDC->FillSolidRect(&rcArr, clrArr);
    rcArr.OffsetRect(1, (i < 2) ? 1 : -1);
}

pDC->SetBkColor(nBkClr); // restore bk color

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