C++ CControlBase::Draw方法代码示例

// 画子控件
BOOL CControlBase::DrawSubControls(CDC &dc, CRect rcUpdate)
{
	for (size_t i = 0; i < m_vecControl.size(); i++)
	{
		CControlBase * pControlBase = m_vecControl.at(i);
		if (pControlBase && pControlBase->GetVisible())
		{
			pControlBase->Draw(dc, rcUpdate);		
		}
	}

	return TRUE;
}

void CControlBase::Draw(CDC &dc, CRect rcUpdate)
{
	if(m_bIsVisible && !(m_rc & rcUpdate).IsRectEmpty())
	{
		DrawControl(dc, rcUpdate);

		// 画子区域
		for (size_t i = 0; i < m_vecArea.size(); i++)
		{
			CControlBase * pControlBase = m_vecArea.at(i);
			if (pControlBase)
			{
				pControlBase->Draw(dc, rcUpdate);
			}
		}

		// 画子控件
		DrawSubControls(dc, rcUpdate);
	}
}

void CDlgPopup::DrawWindow(CDC *pDC)
{
	if(!m_bInitFinish) return;

	CRect rcClient;
	GetClientRect(&rcClient);

	CDC MemDC;
	MemDC.CreateCompatibleDC(pDC);

	CBitmap memBit;
	//memBit.CreateCompatibleBitmap(pDC, rcClient.Width(), rcClient.Height());
	// 因为直接使用CreateCompatibleBitmap在16位颜色下会有问题,因此改为调用DuiCreateCompatibleBitmap函数
	HBITMAP	hMemBitmap = DuiCreateCompatibleBitmap(rcClient);
	memBit.Attach(hMemBitmap);

	CBitmap *pOldBit = MemDC.SelectObject(&memBit);

	MemDC.SetBkMode(TRANSPARENT);
	if(m_pImage)
	{
		Graphics graphics(MemDC);
		if(m_enBackMode == enBMFrame)	// 边框模式
		{
			DrawImageFrame(graphics, m_pImage, rcClient, 0, 0, m_sizeBKImage.cx, m_sizeBKImage.cy, m_nFrameSize);
		}else
		if(m_enBackMode == enBMMID)	// 九宫格边框模式
		{
			DrawImageFrameMID(graphics, m_pImage, rcClient, 0, 0, m_sizeBKImage.cx, m_sizeBKImage.cy,
				m_nFrameWLT, m_nFrameHLT, m_nFrameWRB, m_nFrameHRB);
		}else	// 图片模式
		{
			graphics.DrawImage(m_pImage, Rect(0, 0, m_sizeBKImage.cx, m_sizeBKImage.cy), 0, 0, m_sizeBKImage.cx, m_sizeBKImage.cy, UnitPixel);
		}
	}
	else
	{
		MemDC.FillSolidRect(rcClient.left, rcClient.top, rcClient.Width(), rcClient.Height(), RGB(0, 147, 209));
		MemDC.FillSolidRect(rcClient.left + 1, rcClient.top + 1, rcClient.Width() - 2, rcClient.Height() - 2, RGB(255, 255, 255));
	}

	DrawWindow(MemDC, rcClient);
	DrawWindowEx(MemDC, rcClient);

	for (size_t i = 0; i < m_vecArea.size(); i++)
	{
		CControlBase * pControlBase = m_vecArea.at(i);
		if (pControlBase)
		{
			pControlBase->Draw(MemDC, rcClient);
		}
	}

	for (size_t i = 0; i < m_vecControl.size(); i++)
	{
		CControlBase * pControlBase = m_vecControl.at(i);
		if (pControlBase)
		{
			pControlBase->Draw(MemDC, rcClient);			
		}
	}

	ClientToScreen(&rcClient);
	POINT pointDes;
	pointDes.x = rcClient.left;
	pointDes.y = rcClient.top;
	POINT pointSrc;
	pointSrc.x = 0;
	pointSrc.y = 0;
	SIZE sizeDes;
	sizeDes.cx = rcClient.Width();
	sizeDes.cy = rcClient.Height();

	BLENDFUNCTION blend;
	memset( &blend, 0, sizeof( blend) );
	blend.AlphaFormat = AC_SRC_ALPHA ;
	blend.SourceConstantAlpha = m_nBackTranslucent;

	HWND hWnd = GetSafeHwnd();
	SetWindowLong(hWnd,GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);
	// 如果允许背景Alpha通道,则根据是否有背景图片决定是否使用Aplha通道
	DWORD dwFlags = 0;
	if(m_bBackAlpha)
	{
		dwFlags = (m_pImage ? ULW_ALPHA : ULW_COLORKEY);
	}
	UpdateLayeredWindow(pDC, &pointDes, &sizeDes, &MemDC, &pointSrc, 0, &blend, dwFlags);

	MemDC.SelectObject(pOldBit);
	memBit.DeleteObject();
	MemDC.DeleteDC();
}

// 画子控件(支持滚动显示)
BOOL CDuiPanel::DrawSubControls(CDC &dc, CRect rcUpdate)
{
	// 如果不需要滚动条,则直接使用父控件的画图方法
	if(!m_bEnableScroll || ((m_nVirtualHeight <= m_rc.Height()) && (m_nVirtualWidth <= m_rc.Width())))
	{
		return __super::DrawSubControls(dc, rcUpdate);
	}

	BOOL bShowScrollV = m_nVirtualHeight > m_rc.Height();
	BOOL bShowScrollH = m_nVirtualWidth > m_rc.Width();

	// 计算显示位置
	CDuiScrollVertical* pScrollV = (CDuiScrollVertical*)m_pControScrollV;
	int nCurPosV = pScrollV->GetScrollCurrentPos();	// 当前top位置
	int nMaxRangeV = pScrollV->GetScrollMaxRange();
	int nVirtualTop = (nMaxRangeV > 0) ? nCurPosV*(m_nVirtualHeight-m_rc.Height())/nMaxRangeV : 0;	// 当前显示的是虚拟图片中什么位置开始的图片

	CDuiScrollHorizontal* pScrollH = (CDuiScrollHorizontal*)m_pControScrollH;
	int nCurPosH = pScrollH->GetScrollCurrentPos();	// 当前top位置
	int nMaxRangeH = pScrollH->GetScrollMaxRange();
	int nVirtualLeft = (nMaxRangeH > 0) ? nCurPosH*(m_nVirtualWidth-m_rc.Width())/nMaxRangeH : 0;	// 当前显示的是虚拟图片中什么位置开始的图片

	// 根据滚动条位置画子控件
	// 初始化虚拟显示dc,并复制背景到虚拟显示dc
	CBitmap	virtualBitmap;
	CDC virtualDC;
	virtualDC.CreateCompatibleDC(&dc);
	virtualBitmap.CreateCompatibleBitmap(&dc,
				bShowScrollH ? (m_rc.left + m_nVirtualWidth) : (m_rc.right - (bShowScrollV ? m_nScrollWidth : 0)),
				bShowScrollV ? (m_rc.top + m_nVirtualHeight) : (m_rc.bottom - (bShowScrollH ? m_nScrollWidth : 0)) );
	CBitmap* pOldVirtualBitmap = virtualDC.SelectObject(&virtualBitmap);
	virtualDC.BitBlt(m_rc.left+nVirtualLeft, m_rc.top+nVirtualTop,
				m_rc.Width()-(bShowScrollV ? m_nScrollWidth : 0),
				m_rc.Height()-(bShowScrollH ? m_nScrollWidth : 0),
				&dc, m_rc.left, m_rc.top, SRCCOPY);	// 背景复制到虚拟显示dc

	// 更新区域按照显示区域调整
	rcUpdate.OffsetRect(nVirtualLeft, nVirtualTop);

	// 画子控件到虚拟dc
	for (size_t i = 0; i < m_vecControl.size(); i++)
	{
		CControlBase * pControlBase = m_vecControl.at(i);
		if (pControlBase && pControlBase->GetVisible()
			&& (pControlBase != m_pControScrollV) && (pControlBase != m_pControScrollH))
		{
			// 如果顶部位置发生了变化,需要重画所有子控件,但会造成速度很慢
			if(m_nVirtualTop != nVirtualTop)
			{
				pControlBase->UpdateControl(true);
			}
			pControlBase->Draw(virtualDC, rcUpdate);		
		}
	}

	// 画滚动条,滚动条整个区域都需要更新
	m_pControScrollV->Draw(dc, m_pControScrollV->GetRect());
	m_pControScrollH->Draw(dc, m_pControScrollH->GetRect());

	m_nVirtualTop = nVirtualTop;
	m_nVirtualLeft = nVirtualLeft;

	// 虚拟显示dc复制到dc(滚动条部分不用复制)
	dc.BitBlt(m_rc.left, m_rc.top, m_rc.Width()-(bShowScrollV ? m_nScrollWidth : 0),
			m_rc.Height()-(bShowScrollH ? m_nScrollWidth : 0),
			&virtualDC, m_rc.left + nVirtualLeft, m_rc.top + nVirtualTop, SRCCOPY);

	// 释放虚拟显示dc
	virtualDC.SelectObject(pOldVirtualBitmap);
	virtualDC.DeleteDC();
	virtualBitmap.DeleteObject();

	return TRUE;
}