text_painter.cpp

// text_painter.cpp

// Copyright (C) 2004 Steven Weiß (steven11@gmx.de)
//
// Permission to copy, use, sell and distribute this software is granted
// provided this copyright notice appears in all copies.
// Permission to modify the code and to distribute modified code is granted
// provided this copyright notice appears in all copies, and a notice
// that the code was modified is included with the copyright notice.
//
// This software is provided "as is" without express or implied warranty,
// and with no claim as to its suitability for any purpose.


#include <background_wnd/painters/text_painter.hpp>


namespace win32 { namespace gui {

text_painter::font_info::font_info(LOGFONT lf, unsigned min_font_height, unsigned max_font_height, COLORREF cr)
     : lf_(lf), min_font_height_(min(min_font_height, max_font_height)), max_font_height_(max(min_font_height, max_font_height)), cr_(cr)
{
     lf_.lfHeight = 0;
}

// ========================================================================================================= //

text_painter::text_painter(param0 str, param1 font_info) 
     : str_(str), info_(font_info), draw_text_options_(NULL)
{}

text_painter* text_painter::clone() const
{
     return new text_painter(*this);
}

void text_painter::draw(HDC hDC, int cx, int cy)
{    
     if (cx <= 0 || cy <= 0)
          return;
     RECT rc = { 0, 0, cx, cy };
     
     // create font
     info_.lf_.lfHeight = info_.max_font_height_;
     HFONT hFont = CreateFontIndirect(&info_.lf_);
     HGDIOBJ hOldFont = SelectObject(hDC, hFont);
     
     // Iterate through font-sizes and find a size where the text fits     
     for (; info_.lf_.lfHeight >= (long) info_.min_font_height_; --info_.lf_.lfHeight) {
          if (info_.lf_.lfHeight != info_.max_font_height_) {
               SelectObject(hDC, hOldFont);
               DeleteObject(hFont);          
               
               hFont = CreateFontIndirect(&info_.lf_);           
               SelectObject(hDC, hFont);
          }

          // because DrawText() modifies the rect we must have a temporary copy
          RECT rc_temp = rc;       
          int height = DrawText(hDC, str_.c_str(), (int) str_.length(), &rc_temp, DT_CALCRECT | draw_text_options_);
          if (height <= rc.bottom - rc.top)
               break;         
     }
     info_.lf_.lfHeight = max(info_.lf_.lfHeight, info_.min_font_height_);

     // Draw text and clean up
     int oldBkMode = SetBkMode(hDC, TRANSPARENT);
     COLORREF crOld = SetTextColor(hDC, info_.cr_);         
     DrawText(hDC, str_.c_str(), (int) str_.length(), &rc, draw_text_options_);
     SetTextColor(hDC, crOld);
     SetBkMode(hDC, oldBkMode);

     SelectObject(hDC, hOldFont);
     DeleteObject(hFont);
}

void text_painter::text(const std::string& str)
{
     str_ = str;
}

std::string text_painter::text() const
{
     return str_;
}

void text_painter::info(const font_info& info)
{
     unsigned last_height = info_.lf_.lfHeight;        // save last height
     info_ = info;
     info_.lf_.lfHeight = last_height;
}

text_painter::font_info text_painter::info() const
{
     return info_;
}

void text_painter::draw_text_options(unsigned flags)
{
     draw_text_options_ = flags;
}

unsigned text_painter::draw_text_options() const
{
     return draw_text_options_;
}

unsigned text_painter::last_used_text_height() const
{
     return info_.lf_.lfHeight;
}


} }  // namespace win32::gui

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