362 lines
11 KiB
C++
362 lines
11 KiB
C++
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/*************************************************************************/
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/* Copyright (C) 1999 Microsoft Corporation */
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/* File: ctext.cpp */
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/* Description: Implementation of ctext class for drawing text. */
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/* Author: phillu */
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/* Date: 10/06/99 */
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/*************************************************************************/
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#include "stdafx.h"
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#include "ctext.h"
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/*************************************************************************/
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/* Function: CText::CText() */
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/* Description: Initialize the properties and states. */
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/*************************************************************************/
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CText::CText()
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{
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m_fDirty = true;
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m_hFont = NULL;
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//properties
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m_uiFontSize = 10;
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m_uiAlignment = TA_CENTER;
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m_clrTextColor = GetSysColor(COLOR_WINDOWTEXT);
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m_bstrFontFace = L"Arial";
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m_bstrFontStyle = L"Normal";
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m_fFontStyleFlags = FS_NORMAL;
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m_fFixedSizeFont = false;
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}
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/*************************************************************************/
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/* Function: CText::~CText() */
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/* Description: Destroy the cached font. */
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/*************************************************************************/
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CText::~CText()
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{
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if (m_hFont)
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{
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::DeleteObject(m_hFont);
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m_hFont = NULL;
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}
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}
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/*************************************************************************/
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/* Function: Write */
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/* Description: Draw text in the specified rectangle. */
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/* The font is not created until drawing text for the first time. */
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/* Assume the following settings: */
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/* - Use Transparent background mode; no change of bg color */
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/* - Vertical alignment is always centered */
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/*************************************************************************/
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HRESULT CText::Write(HDC hdc, const RECT & rc, const WCHAR * pwszText)
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{
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USES_CONVERSION;
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HRESULT hr = S_OK;
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const int cBorderMargin = 2; // 2 pixel margin on left or right border
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// set drawing attributes, save the old ones
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UINT uiOldAlign = ::SetTextAlign(hdc, m_uiAlignment|TA_BOTTOM);
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COLORREF crOldTextColor = ::SetTextColor(hdc, m_clrTextColor);
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int iOldBkMode = ::SetBkMode(hdc, TRANSPARENT);
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// create the required font
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if (m_fDirty)
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{
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hr = RealizeFont(hdc);
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}
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HFONT hOldFont = NULL;
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if (m_hFont)
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{
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hOldFont = (HFONT) ::SelectObject(hdc, m_hFont);
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}
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// set position of text based on alignment
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TEXTMETRIC tm;
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GetTextMetrics(hdc, &tm);
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int x = (rc.left + rc.right)/2;
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if (m_uiAlignment == TA_LEFT)
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{
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x = rc.left + cBorderMargin;
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}
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else if (m_uiAlignment == TA_RIGHT)
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{
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x = rc.right - cBorderMargin;
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}
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// text is aligned at the bottom. Adding half of text height makes
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// it to position at the center vertically
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int y = (rc.top + rc.bottom)/2 + tm.tmHeight/2;
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LPCTSTR strTemp = W2CT(pwszText);
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int nLength = _tcslen(strTemp);
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if (NULL == strTemp)
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{
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hr = E_POINTER;
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}
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else
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{
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::TextOut(hdc, x, y, strTemp, nLength);
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}
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// restore original font
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if (hOldFont)
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{
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::SelectObject(hdc, hOldFont);
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}
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::SetTextAlign(hdc, uiOldAlign);
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::SetTextColor(hdc, crOldTextColor);
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::SetBkMode(hdc, iOldBkMode);
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return hr;
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}
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/*************************************************************************/
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/* Function: GetTextWidth */
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/* Description: Get the width of text string based on the current font */
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/* and settings. */
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/*************************************************************************/
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HRESULT CText::GetTextWidth(HDC hdc, const WCHAR * pwszText, SIZE *pSize)
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{
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USES_CONVERSION;
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HRESULT hr = S_OK;
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const int cBorderMargin = 2; // 2 pixel margin on left or right border
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// create the required font
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if (m_fDirty)
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{
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hr = RealizeFont(hdc);
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}
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HFONT hOldFont = NULL;
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if (m_hFont)
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{
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hOldFont = (HFONT) ::SelectObject(hdc, m_hFont);
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}
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LPCTSTR strTemp = W2CT(pwszText);
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int nLength = _tcslen(strTemp);
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if (NULL == strTemp) // guard agaist a NULL pointer
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{
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hr = E_POINTER;
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}
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else
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{
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::GetTextExtentPoint32(hdc, strTemp, nLength, pSize);
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pSize->cx += 2*cBorderMargin;
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}
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if (hOldFont)
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{
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::SelectObject(hdc, hOldFont);
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}
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return hr;
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}
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/*************************************************************************/
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/* Function: RealizeFont */
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/* Description: create a font based on the current font style, size etc. */
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/* Cache the font. */
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/*************************************************************************/
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HRESULT CText::RealizeFont(HDC hdc)
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{
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USES_CONVERSION;
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HRESULT hr = S_OK;
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if( NULL != m_hFont)
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{
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::DeleteObject(m_hFont);
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m_hFont = NULL;
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}
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// by default, font size changes with system font size which
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// depends on the system screen resolution
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int nPixelsPerInch = GetDeviceCaps(hdc, LOGPIXELSY);
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// if we fixed the font size, we assume always small font (96 pixels per inch)
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if (m_fFixedSizeFont)
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{
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nPixelsPerInch = 96;
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}
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int nHeight = -MulDiv(m_uiFontSize, nPixelsPerInch, 72);
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m_hFont = ::CreateFont(
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nHeight, // logical height of font
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0, // logical average character width
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0, // angle of escapement
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0, // base-line orientation angle
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(m_fFontStyleFlags&FS_BOLD)?FW_BOLD:FW_NORMAL,// font weight
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(m_fFontStyleFlags&FS_ITALIC)?1:0, // italic attribute flag
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(m_fFontStyleFlags&FS_UNDERLINE)?1:0, // underline attribute flag
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(m_fFontStyleFlags&FS_STRIKEOUT)?1:0, // strikeout attribute flag
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DEFAULT_CHARSET, // character set identifier
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OUT_DEFAULT_PRECIS, // output precision
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CLIP_DEFAULT_PRECIS, // clipping precision
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ANTIALIASED_QUALITY, // output quality
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DEFAULT_PITCH, // pitch and family
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W2T(m_bstrFontFace.m_str) // pointer to typeface name string
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);
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if( NULL == m_hFont )
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{
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DWORD dwErr;
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dwErr = GetLastError();
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hr = HRESULT_FROM_WIN32(dwErr);
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}
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m_fDirty = false;
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return hr;
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}
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/*************************************************************************/
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/* Function: SetFontSize */
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/* Description: set the FontSize property, in pt. */
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/*************************************************************************/
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void CText::SetFontSize(long lSize)
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{
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if ((UINT)lSize != m_uiFontSize)
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{
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m_uiFontSize = (UINT)lSize;
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m_fDirty = true;
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}
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}
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/*************************************************************************/
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/* Function: SetFixedSizeFont */
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/* Description: set flag which indicates whether the font size is fixed */
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/* or variable with system font. */
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/*************************************************************************/
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void CText::SetFixedSizeFont(bool fFixed)
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{
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if (fFixed != m_fFixedSizeFont)
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{
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m_fFixedSizeFont = fFixed;
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m_fDirty = true;
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}
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}
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/*************************************************************************/
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/* Function: SetFontFace */
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/* Description: set the FontFace property. */
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/*************************************************************************/
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void CText::SetFontFace(BSTR pwszFontFace)
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{
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if (_wcsicmp(m_bstrFontFace, pwszFontFace) != 0)
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{
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m_bstrFontFace = pwszFontFace;
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m_fDirty = true;
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}
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}
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/*************************************************************************/
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/* Function: SetFontStyle */
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/* Description: set the FontStyle property. The style string should */
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/* contain either "Normal", or concatenation of one or more strings of: */
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/* "Bold", "Italic", "Underline", "Strikeout". Default is "Normal". */
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/*************************************************************************/
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void CText::SetFontStyle(BSTR pwszFontStyle)
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{
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BYTE fFontStyleFlags = FS_NORMAL;
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//find a match
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if( NULL != wcsstr(pwszFontStyle, L"Normal"))
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{
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fFontStyleFlags = FS_NORMAL;
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}
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else
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{
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// Turn on all styles that match
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if( NULL != wcsstr(pwszFontStyle, L"Bold"))
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{
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fFontStyleFlags |= FS_BOLD;
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}
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if( NULL != wcsstr(pwszFontStyle, L"Italic"))
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{
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fFontStyleFlags |= FS_ITALIC;
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}
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if( NULL != wcsstr(pwszFontStyle, L"Underline"))
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{
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fFontStyleFlags |= FS_UNDERLINE;
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}
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if( NULL != wcsstr(pwszFontStyle, L"Strikeout"))
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{
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fFontStyleFlags |= FS_STRIKEOUT;
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}
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}
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if (fFontStyleFlags != m_fFontStyleFlags)
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{
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m_fFontStyleFlags = fFontStyleFlags;
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m_bstrFontStyle = pwszFontStyle;
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m_fDirty = true;
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}
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}
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/*************************************************************************/
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/* Function: SetFontSize */
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/* Description: set the FontSize property, in pt. */
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/*************************************************************************/
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void CText::SetTextColor(COLORREF clrColor)
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{
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if (clrColor != m_clrTextColor)
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{
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m_clrTextColor = clrColor;
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}
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}
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/*************************************************************************/
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/* Function: SetTextAlignment */
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/* Description: set the TextAlignment property. It controls the */
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/* horizontal text alignment. Must be one of "Left", "Center", or */
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/* "Right". Default is "Center". */
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/*************************************************************************/
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void CText::SetTextAlignment(BSTR pwszAlignment)
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{
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UINT uiAlignment = 0;
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//set the text alignment
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if (!_wcsicmp(pwszAlignment, L"Right"))
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{
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uiAlignment = TA_RIGHT;
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}
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else if (!_wcsicmp(pwszAlignment, L"Center"))
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{
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uiAlignment = TA_CENTER;
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}
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else if (!_wcsicmp(pwszAlignment, L"Left"))
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{
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uiAlignment = TA_LEFT;
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}
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if (m_uiAlignment != uiAlignment)
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{
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m_uiAlignment = uiAlignment;
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}
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}
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