孙鑫Lesson5 text

MFC文本编辑器实现

最新推荐文章于 2018-10-21 22:54:58 发布

原创最新推荐文章于 2018-10-21 22:54:58 发布 · 306 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#text

本文介绍了一个基于MFC框架的简单文本编辑器实现过程，包括如何创建插入符、设置字体大小、绘制文本及响应键盘输入等核心功能。通过具体的代码示例展示了窗口绘制、定时器处理以及字符输入事件的处理方法。

此节主要是创建插入符，并获取字体大小创建

void CTEXTView::OnDraw(CDC* pDC)
{
	CTEXTDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	if (!pDoc)
		return;
	//CString str("this is test app");
	CString str;
	str="this is test app";
	pDC->TextOut(50,50,str);
	CSize sz=pDC->GetTextExtent(str);


	str.LoadString(IDS_XXX);


	pDC->TextOut(100,100,str);


	pDC->BeginPath();
	pDC->Rectangle(50,50,50+sz.cx,50+sz.cy);
	pDC->EndPath();
	pDC->SelectClipPath(RGN_DIFF);


	for(int i=0;i<300;i+=10)
	{
		pDC->MoveTo(0,i);
		pDC->LineTo(300,i);
		pDC->MoveTo(i,0);
		pDC->LineTo(i,300);
	}

}

int CTEXTView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CView::OnCreate(lpCreateStruct) == -1)
		return -1;


	// TODO:  在此添加您专用的创建代码
	CClientDC dc(this);
	TEXTMETRIC tm;
	dc.GetTextMetrics(&tm);
	//CreateSolidCaret(tm.tmAveCharWidth/8,tm.tmHeight);
	
	bitmap.LoadBitmap(IDB_BITMAP1);
	CreateCaret(&bitmap);
	ShowCaret();
	SetTimer(1,100,NULL);
	return 0;
}

void CTEXTView::OnTimer(UINT_PTR nIDEvent)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	m_nWidth+=5;


	CClientDC dc(this);
	TEXTMETRIC tm;
	dc.GetTextMetrics(&tm);
	CRect rect;
	rect.left=0;
	rect.top=200;
	rect.right=m_nWidth;
	rect.bottom=rect.top+tm.tmHeight;
	dc.SetTextColor(RGB(255,0,0));
	CString str;
	str.LoadStringA(IDS_XXX);
	dc.DrawText(str,rect,DT_LEFT);


	rect.top=150;
	rect.bottom=rect.top+tm.tmHeight;
	dc.DrawText(str,rect,DT_RIGHT);


	CSize sz=dc.GetTextExtent(str);
	if(m_nWidth>sz.cx)
	{
		m_nWidth=0;
		dc.SetTextColor(RGB(0,255,0));
		dc.TextOutA(0,200,str);
	}


	CView::OnTimer(nIDEvent);
}

void CTEXTView::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	CClientDC dc(this);
	CFont font;
	font.CreatePointFont(300,"华文行楷",NULL);
	CFont* pOldFont=dc.SelectObject(&font);
	TEXTMETRIC tm;
	dc.GetTextMetrics(&tm);
	if(0x0d==nChar)
	{
		m_strLine.Empty();
		m_ptOrigin.y+=tm.tmHeight;
	}
	else if(0x08==nChar)
	{
		COLORREF clr=dc.SetTextColor(dc.GetBkColor());
		dc.TextOut(m_ptOrigin.x,m_ptOrigin.y,m_strLine);
		m_strLine=m_strLine.Left(m_strLine.GetLength()-1);
		dc.SetTextColor(clr);
	}
	else 
	{
		m_strLine+=(TCHAR)nChar;
	}
	CSize sz=dc.GetTextExtent(m_strLine);
	CPoint pt;
	pt.x=m_ptOrigin.x+sz.cx;
	pt.y=m_ptOrigin.y;


	SetCaretPos(pt);
	
	dc.TextOut(m_ptOrigin.x,m_ptOrigin.y,m_strLine);
	dc.SelectObject(pOldFont);


	CView::OnChar(nChar, nRepCnt, nFlags);
}




void CTEXTView::OnLButtonDown(UINT nFlags, CPoint point)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值


	SetCaretPos(point);
	m_strLine.Empty();
	m_ptOrigin=point;
	CView::OnLButtonDown(nFlags, point);
}