logscrollview.cpp

VC技术内幕源程序

// LogScrollView.cpp  scrollview for Logical Twips only
#include "stdafx.h"
#include <afxpriv.h>
#include "LogScrollView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CLogScrollView

BEGIN_MESSAGE_MAP(CLogScrollView, CView)
	//{{AFX_MSG_MAP(CLogScrollView)
	ON_WM_SIZE()
	ON_WM_HSCROLL()
	ON_WM_VSCROLL()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CLogScrollView construction/destruction

CLogScrollView::CLogScrollView()
{
	// Init everything to zero
	AFX_ZERO_INIT_OBJECT(CView);
}

CLogScrollView::~CLogScrollView()
{
}

/////////////////////////////////////////////////////////////////////////////
// CLogScrollView painting

void CLogScrollView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo)
{
	ASSERT_VALID(pDC);
	if(pDC->IsPrinting()) {
		pDC->SetMapMode(MM_TWIPS);
	}
	else {
		ASSERT(m_totalDev.cx >= 0 && m_totalDev.cy >= 0);
		pDC->SetMapMode(MM_ANISOTROPIC);
		pDC->SetWindowExt(1440, 1440);
		pDC->SetViewportExt(pDC->GetDeviceCaps(LOGPIXELSX),
						-pDC->GetDeviceCaps(LOGPIXELSX));
		CPoint ptVpOrg(0, 0);       // assume no shift for printing
		ASSERT(pDC->GetWindowOrg() == CPoint(0,0));

		// by default shift viewport origin in negative direction of scroll
		ptVpOrg = -GetDeviceScrollPosition();

		if (m_bCenter) {
			CRect rect;
			GetClientRect(&rect);

			// if client area is larger than total device size,
			// override scroll positions to place origin such that
			// output is centered in the window
			if (m_totalDev.cx < rect.Width())
				ptVpOrg.x = (rect.Width() - m_totalDev.cx) / 2;
			if (m_totalDev.cy < rect.Height())
				ptVpOrg.y = (rect.Height() - m_totalDev.cy) / 2;
		}
		pDC->SetViewportOrg(ptVpOrg);
	}
	CView::OnPrepareDC(pDC, pInfo);     // For default Printing behavior
}

/////////////////////////////////////////////////////////////////////////////
// Set mode and scaling/scrolling sizes

void CLogScrollView::SetLogScrollSizes(SIZE sizeTotal)
{
	ASSERT(sizeTotal.cx >= 0 && sizeTotal.cy >= 0);
    CSize sizePage(sizeTotal.cx / 2,
                   sizeTotal.cy / 2);   // page scroll
    CSize sizeLine(sizeTotal.cx / 100,
                   sizeTotal.cy / 100); // line scroll
	m_totalLog = sizeTotal;

	//BLOCK: convert logical coordinate space to device coordinates
	{
		CWindowDC dc(NULL);
		dc.SetMapMode(MM_ANISOTROPIC);
		dc.SetWindowExt(1440, 1440);
		dc.SetViewportExt(dc.GetDeviceCaps(LOGPIXELSX),
						-dc.GetDeviceCaps(LOGPIXELSX));

		// total size
		m_totalDev = m_totalLog;
		dc.LPtoDP((LPPOINT)&m_totalDev);
		m_pageDev = sizePage;
		dc.LPtoDP((LPPOINT)&m_pageDev);
		m_lineDev = sizeLine;
		dc.LPtoDP((LPPOINT)&m_lineDev);
		if (m_totalDev.cy < 0)
			m_totalDev.cy = -m_totalDev.cy;
		if (m_pageDev.cy < 0)
			m_pageDev.cy = -m_pageDev.cy;
		if (m_lineDev.cy < 0)
			m_lineDev.cy = -m_lineDev.cy;
	} // release DC here

	// now adjust device specific sizes
	ASSERT(m_totalDev.cx >= 0 && m_totalDev.cy >= 0);
	if (m_pageDev.cx == 0)
		m_pageDev.cx = m_totalDev.cx / 10;
	if (m_pageDev.cy == 0)
		m_pageDev.cy = m_totalDev.cy / 10;
	if (m_lineDev.cx == 0)
		m_lineDev.cx = m_pageDev.cx / 10;
	if (m_lineDev.cy == 0)
		m_lineDev.cy = m_pageDev.cy / 10;

	if (m_hWnd != NULL)
	{
		// window has been created, invalidate now
		UpdateBars();
		Invalidate(TRUE);
	}
}

/////////////////////////////////////////////////////////////////////////////
// Getting information

CPoint CLogScrollView::GetScrollPosition() const   // logical coordinates
{
	CPoint pt = GetDeviceScrollPosition();
	// pt may be negative if m_bCenter is set

	CWindowDC dc(NULL);
	dc.SetMapMode(MM_ANISOTROPIC);
	dc.SetWindowExt(1440, 1440);
	dc.SetViewportExt(dc.GetDeviceCaps(LOGPIXELSX),
					-dc.GetDeviceCaps(LOGPIXELSX));
	dc.DPtoLP((LPPOINT)&pt);
	return pt;
}

void CLogScrollView::ScrollToPosition(POINT pt)    // logical coordinates
{
	CWindowDC dc(NULL);
	dc.SetMapMode(MM_ANISOTROPIC);
	dc.SetWindowExt(1440, 1440);
	dc.SetViewportExt(dc.GetDeviceCaps(LOGPIXELSX),
					-dc.GetDeviceCaps(LOGPIXELSX));
	dc.LPtoDP((LPPOINT)&pt);

	// now in device coordinates - limit if out of range
	int xMax = GetScrollLimit(SB_HORZ);
	int yMax = GetScrollLimit(SB_VERT);
	if (pt.x < 0)
		pt.x = 0;
	else if (pt.x > xMax)
		pt.x = xMax;
	if (pt.y < 0)
		pt.y = 0;
	else if (pt.y > yMax)
		pt.y = yMax;

	ScrollToDevicePosition(pt);
}

CPoint CLogScrollView::GetDeviceScrollPosition() const
{
	CPoint pt(GetScrollPos(SB_HORZ), GetScrollPos(SB_VERT));
	ASSERT(pt.x >= 0 && pt.y >= 0);

	if (m_bCenter)
	{
		CRect rect;
		GetClientRect(&rect);

		// if client area is larger than total device size,
		// the scroll positions are overridden to place origin such that
		// output is centered in the window
		// GetDeviceScrollPosition() must reflect this

		if (m_totalDev.cx < rect.Width())
			pt.x = -((rect.Width() - m_totalDev.cx) / 2);
		if (m_totalDev.cy < rect.Height())
			pt.y = -((rect.Height() - m_totalDev.cy) / 2);
	}

	return pt;
}

void CLogScrollView::ScrollToDevicePosition(POINT ptDev)
{
	ASSERT(ptDev.x >= 0);
	ASSERT(ptDev.y >= 0);

	// Note: ScrollToDevicePosition can and is used to scroll out-of-range
	//  areas as far as CLogScrollView is concerned -- specifically in
	//  the print-preview code.  Since OnScrollBy makes sure the range is
	//  valid, ScrollToDevicePosition does not vector through OnScrollBy.

	int xOrig = GetScrollPos(SB_HORZ);
	SetScrollPos(SB_HORZ, ptDev.x);
	int yOrig = GetScrollPos(SB_VERT);
	SetScrollPos(SB_VERT, ptDev.y);
	ScrollWindow(xOrig - ptDev.x, yOrig - ptDev.y);
}

/////////////////////////////////////////////////////////////////////////////
// Other helpers

void CLogScrollView::FillOutsideRect(CDC* pDC, CBrush* pBrush)
{
	ASSERT_VALID(pDC);
	ASSERT_VALID(pBrush);

	// fill rect outside the image
	CRect rect;
	GetClientRect(rect);
	ASSERT(rect.left == 0 && rect.top == 0);
	rect.left = m_totalDev.cx;
	if (!rect.IsRectEmpty())
		pDC->FillRect(rect, pBrush);    // vertical strip along the side
	rect.left = 0;
	rect.right = m_totalDev.cx;
	rect.top = m_totalDev.cy;
	if (!rect.IsRectEmpty())
		pDC->FillRect(rect, pBrush);    // horizontal strip along the bottom
}

void CLogScrollView::ResizeParentToFit(BOOL bShrinkOnly)
{
	// adjust parent rect so client rect is appropriate size
	// determine current size of the client area as if no scrollbars present
	CRect rectClient;
	GetWindowRect(rectClient);
	CRect rect = rectClient;
	CalcWindowRect(rect);
	rectClient.left += rectClient.left - rect.left;
	rectClient.top += rectClient.top - rect.top;
	rectClient.right -= rect.right - rectClient.right;
	rectClient.bottom -= rect.bottom - rectClient.bottom;
	rectClient.OffsetRect(-rectClient.left, -rectClient.top);
	ASSERT(rectClient.left == 0 && rectClient.top == 0);

	// determine desired size of the view
	CRect rectView(0, 0, m_totalDev.cx, m_totalDev.cy);
	if (bShrinkOnly)
	{
		if (rectClient.right <= m_totalDev.cx)
			rectView.right = rectClient.right;
		if (rectClient.bottom <= m_totalDev.cy)
			rectView.bottom = rectClient.bottom;
	}
	CalcWindowRect(rectView, CWnd::adjustOutside);
	rectView.OffsetRect(-rectView.left, -rectView.top);
	ASSERT(rectView.left == 0 && rectView.top == 0);
	if (bShrinkOnly)
	{
		if (rectClient.right <= m_totalDev.cx)
			rectView.right = rectClient.right;
		if (rectClient.bottom <= m_totalDev.cy)
			rectView.bottom = rectClient.bottom;
	}

	// dermine and set size of frame based on desired size of view
	CRect rectFrame;
	CFrameWnd* pFrame = GetParentFrame();
	ASSERT_VALID(pFrame);
	pFrame->GetWindowRect(rectFrame);
	CSize size = rectFrame.Size();
	size.cx += rectView.right - rectClient.right;
	size.cy += rectView.bottom - rectClient.bottom;
	pFrame->SetWindowPos(NULL, 0, 0, size.cx, size.cy,
		SWP_NOMOVE|SWP_NOZORDER|SWP_NOACTIVATE);
}

/////////////////////////////////////////////////////////////////////////////

void CLogScrollView::OnSize(UINT nType, int cx, int cy)
{
	CView::OnSize(nType, cx, cy);
	UpdateBars();
}

/////////////////////////////////////////////////////////////////////////////
// Scrolling Helpers

void CLogScrollView::CenterOnPoint(CPoint ptCenter) // center in device coords
{
	CRect rect;
	GetClientRect(&rect);           // find size of client window

	int xDesired = ptCenter.x - rect.Width() / 2;
	int yDesired = ptCenter.y - rect.Height() / 2;

	DWORD dwStyle = GetStyle();

	if ((dwStyle & WS_HSCROLL) == 0 || xDesired < 0)
	{
		xDesired = 0;
	}
	else
	{
		int xMax = GetScrollLimit(SB_HORZ);
		if (xDesired > xMax)
			xDesired = xMax;
	}

	if ((dwStyle & WS_VSCROLL) == 0 || yDesired < 0)
	{
		yDesired = 0;
	}
	else
	{
		int yMax = GetScrollLimit(SB_VERT);
		if (yDesired > yMax)
			yDesired = yMax;
	}

	ASSERT(xDesired >= 0);
	ASSERT(yDesired >= 0);

	int xOrig = GetScrollPos(SB_HORZ);
	SetScrollPos(SB_HORZ, xDesired);
	int yOrig = GetScrollPos(SB_VERT);
	SetScrollPos(SB_VERT, yDesired);
}

/////////////////////////////////////////////////////////////////////////////
// Tie to scrollbars and CWnd behaviour

void CLogScrollView::GetScrollBarSizes(CSize& sizeSb)
{
	sizeSb.cx = sizeSb.cy = 0;
	DWORD dwStyle = GetStyle();

	if (GetScrollBarCtrl(SB_VERT) == NULL)
	{
		// vert scrollbars will impact client area of this window
		sizeSb.cx = GetSystemMetrics(SM_CXVSCROLL);
		if (dwStyle & WS_BORDER)
			sizeSb.cx -= CX_BORDER;
	}
	if (GetScrollBarCtrl(SB_HORZ) == NULL)
	{
		// horz scrollbars will impact client area of this window
		sizeSb.cy = GetSystemMetrics(SM_CYVSCROLL);
		if (dwStyle & WS_BORDER)
			sizeSb.cy -= CY_BORDER;
	}
}

BOOL CLogScrollView::GetTrueClientSize(CSize& size, CSize& sizeSb)
	// return TRUE if enough room to add scrollbars if needed
{
	CRect rect;
	GetClientRect(&rect);
	ASSERT(rect.top == 0 && rect.left == 0);
	size.cx = rect.right;
	size.cy = rect.bottom;
	DWORD dwStyle = GetStyle();

	// first get the size of the scrollbars for this window
	GetScrollBarSizes(sizeSb);

	// first calculate the size of a potential scrollbar
	// (scroll bar controls do not get turned on/off)
	if (sizeSb.cx != 0 && (dwStyle & WS_VSCROLL))
	{
		// vert scrollbars will impact client area of this window
		size.cx += sizeSb.cx;   // currently on - adjust now
	}
	if (sizeSb.cy != 0 && (dwStyle & WS_HSCROLL))
	{