repos_ecs/Device/HC_CARDOCX/StoneU_HC_CARDOCX/VolumeCtrl.cpp

// VolumeCtrl.cpp : implementation file
//

#include "stdafx.h"
#include "StoneU_HC_CARDOCX.h"
#include "VolumeCtrl.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CVolumeCtrl

CVolumeCtrl::CVolumeCtrl() : m_brush(GetSysColor(COLOR_3DFACE)),
							 m_LightPen(PS_SOLID,1,RGB(255,255,255)),
							 m_ShadowPen(PS_SOLID,1,RGB(128,128,128))
{
}

CVolumeCtrl::~CVolumeCtrl()
{
}


BEGIN_MESSAGE_MAP(CVolumeCtrl, CSliderCtrl)
	//{{AFX_MSG_MAP(CVolumeCtrl)
	ON_WM_PAINT()
	ON_WM_ERASEBKGND()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CVolumeCtrl message handlers

void CVolumeCtrl::OnPaint() 
{
	// 调用默认的窗口过程Default()画出控件的标准形状
	Default();

	// 抹掉除滑动块的其它东西
	CWindowDC dc(this);
	CRect rcThumb, rcClient;
	GetThumbRect(&rcThumb);
	dc.ExcludeClipRect(&rcThumb);

	GetClientRect(&rcClient);
	dc.FillRect(&rcClient, &m_brush);

	// 画三角型
	int half = rcThumb.Width() >> 1;
	rcClient.left   += 12 + half;
	rcClient.right  -= 12 + half;
	rcClient.top    += 3;
	rcClient.bottom -= 3;

	DrawTriangle(&dc, &rcClient);

	// Do not call CSliderCtrl::OnPaint() for painting messages
}


void CVolumeCtrl::DrawTriangle(CDC *pDC, CRect *prcDraw)
{
	// 笔移动左下
	pDC->MoveTo(prcDraw->left, prcDraw->bottom);

	// 选择高亮画笔,并保存原来的画笔
	CPen *pOldPen = pDC->SelectObject(&m_LightPen);
 
	// 画下边
	pDC->LineTo(prcDraw->BottomRight());

	// 画右边
	pDC->LineTo(prcDraw->right, prcDraw->top);

	// 选择阴影画笔
	pDC->SelectObject(&m_ShadowPen);

	// 画斜边
	pDC->LineTo(prcDraw->left, prcDraw->bottom); 

	// 恢复原来的画笔
	pDC->SelectObject(pOldPen);
}


BOOL CVolumeCtrl::OnEraseBkgnd(CDC* pDC) 
{
	// 直接返回, 因为OnPaint里我们有一个FillRect操作, 可以理解为擦除背景
    // 没有必要擦除两次

	
	return TRUE;  // CSliderCtrl::OnEraseBkgnd(pDC);
}

BOOL CVolumeCtrl::PreTranslateMessage(MSG* pMsg)
{
	// TODO: Add your specialized code here and/or call the base class
	CRect m_SliderRect;
	GetWindowRect(m_SliderRect);
	if(pMsg->message == WM_LBUTTONDOWN)
	{
		m_MousePt.x = pMsg->pt.x;
	}
	if(pMsg->message == WM_LBUTTONUP)
	{
		if(m_MousePt.x == pMsg->pt.x)
		{
			int max, min;
			this->GetRange(min, max);
			this->SetPos( min + (m_MousePt.x-m_SliderRect.left)*(max-min)/(m_SliderRect.right - m_SliderRect.left) );
			Invalidate();
		}			
	}

	return CSliderCtrl::PreTranslateMessage(pMsg);
}