sjgui documentation

00001 // $Id: text.h,v 1.1.1.1 2003/06/24 15:33:13 sjcomp Exp $
00002 // Copyright (c) 2003, Alexander Shyrokov aka SJ
00003 // E-mail: sjcomp[@]users.sourceforge.com
00004 // Web:    http://sjgui.sourceforge.net
00005 //
00006 // This code is under BSD license agreement.
00007 //
00008 // Alexander Shyrokov makes no representations about the suitability of this software 
00009 // for any purpose. It is provided "AS IS" without express or implied warranty.
00010 
00011 #if !defined(SJTEXT_H_INCLUDED)
00012 #define SJTEXT_H_INCLUDED
00013 
00014 #include <fstream>
00015 #include <iostream>
00016 
00017 #include "textstrs.h"       //CTextStrs
00018 #include "font.h"
00019 
00020 namespace sjgui{
00021 
00022     namespace SJGUI_USE_STYLE
00023     {
00024         extern GLfloat def_text_color[4]; 
00025     }
00026 
00037 template<class Tbase>
00038 class CTextCtrlTmpl : public Tbase,public CFont
00039 {
00040     CWnd::CRect     m_TextPos; // Position of the text.
00041     bool            m_yShowBackPlane; // back plane visibility flag.
00042     // Keeps track of were we're in the text
00043     int             m_iLinesOnScreen; // Number of displayed lines.
00044     int             m_iTopLine; // Index of the top line.
00045     // for horizontal slide
00046     int             m_iShift; // Horizontal shift value.
00047     void Adjust();
00048 protected:
00049     CTextStrs       m_Strings; 
00050     float           m_Color[4]; 
00051     unsigned int    m_uiCursorPos; 
00052     bool            m_yShowCursor; 
00053 
00054     bool            m_ySelectLines; 
00055     int             m_iSelectedLine; 
00056 public:
00057     // This function will be called to display the contest of the window
00058     virtual void OnDraw(); 
00059     virtual void OnReshape(); 
00060     virtual void OnUpdatePos(); 
00061 public:
00068     void ShowBackPlane(bool b=true){m_yShowBackPlane=b;}
00069     CTextCtrlTmpl();
00071     void SetColor(GLfloat* Color){memcpy(m_Color,Color,sizeof(float)*4);}
00073     void SetColor(GLfloat R, GLfloat G, GLfloat B, GLfloat A=1.0f){m_Color[0]=R;m_Color[1]=G;m_Color[2]=B;m_Color[3]=A;}
00075     float* GetColor(){return m_Color;}
00084     void SetCursorPos(unsigned int i);
00086     void MoveCursorToEnd(){m_uiCursorPos=m_Strings.GetMaxDis();if((int)m_uiCursorPos>m_iShift+m_Strings.GetCharOnDisp())m_iShift=m_uiCursorPos-m_Strings.GetCharOnDisp();};
00088     void MoveCursorToBeginning(){m_uiCursorPos=0;if((int)m_uiCursorPos<m_iShift)m_iShift=m_uiCursorPos;};
00090     void InsertAtCursor(unsigned char ch);
00092     void RemoveBeforeCursor();
00094     void RemoveAfterCursor();
00096     void MoveCursorLeft();
00098     void MoveCursorRight();
00100     void ShowCursor(bool y=true){m_yShowCursor=y;};
00102     void HideCursor(){ShowCursor(false);};
00104     bool IsCursorShown(){return m_yShowCursor;};
00106 
00113     void SetIdent(bool b=true){m_Strings.SetIdent(b);}
00115     void SetWrap(bool b=true){if(IsSelectLines() && b)SetSelectLines(false);m_Strings.SetWrap(b);Adjust();}
00117     bool IsWrap(){return m_Strings.IsWrap();}
00119     int GetNumOfLines(){return (int)m_Strings.size();}
00121     int GetMaxLength(){return m_Strings.GetMaxDis();}
00123     void AddLine(const char *cp);
00125     void AddLine(std::string& str){AddLine(str.data());}
00127     const char* GetLine(unsigned int i=0){if(i<m_Strings.size() && m_Strings.size()!=0)return m_Strings[i].data();else return "";}
00128     const char* operator[](unsigned int i){return GetLine(i);}
00130     void ClearText(){m_Strings.clear();Adjust();}
00132     
00134     void SetTopLine(int iLine=0);
00136     int GetTopLine(){return m_iTopLine;};
00138     int GetCharOnDisp(){return m_Strings.GetCharOnDisp();};
00140     void SetSelectLines(bool b=true){if(IsWrap())return;m_ySelectLines=b;};
00142     bool IsSelectLines(){return m_ySelectLines;};
00144     int GetNumLinesOnScreen(){return m_iLinesOnScreen;};
00150     bool NeedWrap(){if(m_Strings.GetMaxDis()>m_Strings.GetCharOnDisp())return true;else return false;};
00152     void LoadTextFromFile(char* pName);
00157     void SetShift(int i=0);
00159     int GetShift(){return m_iShift;};
00164     int GetSelectedLine(){return m_iSelectedLine;};
00166     void SetSelectedLine(int iL){if(iL<GetNumOfLines())m_iSelectedLine=iL;else m_iSelectedLine=GetNumOfLines()-1;};
00168     CTextStrs& GetStrings(){return m_Strings;};
00169 };
00170 
00171 template<class Tbase>
00172 inline void CTextCtrlTmpl<Tbase>::OnUpdatePos()
00173 {
00174     Tbase::OnUpdatePos();
00175     Adjust();
00176 }
00177 
00178 template<class Tbase>
00179 inline void CTextCtrlTmpl<Tbase>::OnReshape()
00180 {
00181     Adjust();
00182 }
00183 
00184 template<class Tbase>
00185 inline void CTextCtrlTmpl<Tbase>::AddLine(const char *cp)
00186 {
00187     m_Strings.push_back(cp);
00188     Adjust();
00189 }
00190 
00191 template<class Tbase>
00192 inline void CTextCtrlTmpl<Tbase>::SetShift(int i/*=0*/)
00193 {
00194     int iTemp=std::max((int)(m_Strings.GetMaxDis()-m_Strings.GetCharOnDisp()),(int)m_Strings.GetMaxDis());
00195     if(i>iTemp)
00196         i=iTemp;
00197     m_iShift=i;
00198 }
00199 
00200 template<class Tbase>
00201 inline void CTextCtrlTmpl<Tbase>::SetTopLine(int iLine/*=0*/)
00202 {
00203     // It could happen that there's less lines on the screen
00204     // that could be displayed
00205     int iTemp=std::max(GetNumOfLines()-m_iLinesOnScreen,GetNumOfLines());
00206     if(iLine>iTemp)
00207             iLine=iTemp;
00208     m_iTopLine=iLine;
00209 }
00210 
00211 template<class Tbase>
00212 inline void CTextCtrlTmpl<Tbase>::LoadTextFromFile(char* pName)
00213 {
00214     try
00215     {
00216         std::fstream fn;
00217         fn.open(pName,std::ios::in|std::ios::binary);
00218         if(!fn.is_open())
00219         {
00220             // just do nothing in this case
00221             std::cerr<<"Could not open text file: "<<pName<<std::endl;
00222             return;
00223         }
00224         m_Strings.clear();
00225         string str;
00226         while(getline(fn,str))
00227             m_Strings.push_back(str);
00228         fn.close();
00229         Adjust();
00230     }
00231     catch(...)
00232     {
00233         std::cerr<<"Text file is not accessible: "<<pName<<std::endl;
00234     }
00235 }
00236 
00237 template<class Tbase>
00238 inline void CTextCtrlTmpl<Tbase>::MoveCursorLeft()
00239 {
00240     if(m_uiCursorPos>0)
00241         m_uiCursorPos--;
00242     if((int)m_uiCursorPos<m_iShift)
00243         m_iShift=m_uiCursorPos;
00244 }
00245 
00246 template<class Tbase>
00247 inline void CTextCtrlTmpl<Tbase>::MoveCursorRight()
00248 {
00249     if(m_uiCursorPos<m_Strings.GetMaxDis())
00250         m_uiCursorPos++;
00251     if((int)m_uiCursorPos>m_iShift+m_Strings.GetCharOnDisp())
00252         m_iShift++;
00253 }
00254 
00255 template<class Tbase>
00256 inline void CTextCtrlTmpl<Tbase>::RemoveBeforeCursor()
00257 {
00258     if(m_Strings.size()==0)AddLine("");
00259     if(m_uiCursorPos<=0)return;
00260     m_Strings.Erase(0,m_uiCursorPos-1,1);
00261     m_uiCursorPos--;
00262     Adjust();
00263 }
00264 
00265 template<class Tbase>
00266 inline void CTextCtrlTmpl<Tbase>::RemoveAfterCursor()
00267 {
00268     if(m_uiCursorPos>=m_Strings.GetMaxDis())return;
00269     m_Strings.Erase(0,m_uiCursorPos,1);
00270     Adjust();
00271 }
00272 
00273 template<class Tbase>
00274 inline void CTextCtrlTmpl<Tbase>::InsertAtCursor(unsigned char ch)
00275 {
00276     if(m_Strings.size()==0)m_Strings.push_back("");
00277     string str="";
00278     str+=ch;
00279     m_Strings.Insert(0,m_uiCursorPos,str);
00280     m_uiCursorPos++;
00281     Adjust();
00282 }
00283 
00284 template<class Tbase>
00285 inline void CTextCtrlTmpl<Tbase>::SetCursorPos(unsigned int i)
00286 {
00287     if(m_Strings.size()==0)m_Strings.push_back("");
00288     if(i<=m_Strings.LenAt(0)) m_uiCursorPos=i;
00289 }
00290 
00291 template<class Tbase>
00292 inline void CTextCtrlTmpl<Tbase>::Adjust()
00293 {
00294     // Amount of characters which could be displayed
00295     m_Strings.SetCharOnDisp((unsigned int)(GetWidth()/GetFontSize()));
00296     m_iLinesOnScreen=(int)(GetHeight()/GetFontSize());
00297     if(m_iLinesOnScreen<0)return;
00298     // Now feel this array with strings as they should be shown
00299     int iCount=0;
00300 // Alignment section
00301     int iX=0;
00302     // label has an inverted viewport to show font properly
00303     int iY=GetHeight()-GetFontSize();
00304     if(m_iSelectedLine>=(int)m_Strings.size())m_iSelectedLine=m_Strings.size()-1;
00305     m_TextPos=m_AbsPos;
00306     m_TextPos.Deflate(GetBorderSize());
00307 // set cursor position
00308     if(m_uiCursorPos==0) return;
00309     if(m_Strings.size()==0)
00310         m_uiCursorPos=0;
00311     else if(m_Strings.LenAt(0)<m_uiCursorPos)
00312         m_uiCursorPos=m_Strings.LenAt(0);
00313     if(m_uiCursorPos>m_iShift+m_Strings.GetCharOnDisp())m_iShift++;
00314     if((int)m_uiCursorPos<m_iShift)m_iShift=m_uiCursorPos;
00315     if(m_uiCursorPos>m_Strings.GetCharOnDisp()&& (m_Strings.LenAt(0)-m_iShift)<m_Strings.GetCharOnDisp())
00316         m_iShift=m_Strings.LenAt(0)-m_Strings.GetCharOnDisp();
00317 }
00318 
00319 template<class Tbase>
00320 inline CTextCtrlTmpl<Tbase>::CTextCtrlTmpl():Tbase(),CFont()
00321 {
00322     SetColor(SJGUI_USE_STYLE::def_text_color);
00323     m_uiCursorPos=0;
00324     m_yShowBackPlane=false;
00325     m_ySelectLines=false;
00326     m_iLinesOnScreen=0;
00327     SetShift(0);
00328     SetTopLine(0);
00329     SetSelectedLine(0);
00330     HideCursor();
00331 }
00332 
00333 template<class Tbase>
00334 inline void CTextCtrlTmpl<Tbase>::OnDraw()
00335 {
00336     if(m_yShowBackPlane)
00337     {
00338         glEnable(GL_BLEND);
00339         glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
00340         // I want it to blend with the background, like a transparent thing
00341         glColor4fv(m_BgColor);
00342         glBegin(GL_TRIANGLE_STRIP);
00343             glVertex2i(m_AbsPos.GetX(),m_AbsPos.GetBottom());
00344             glVertex2i(m_AbsPos.GetX(),m_AbsPos.GetY());
00345             glVertex2i(m_AbsPos.GetRight(),m_AbsPos.GetBottom());
00346             glVertex2i(m_AbsPos.GetRight(),m_AbsPos.GetY());
00347         glEnd();
00348         glDisable(GL_BLEND);
00349         // draw border around the field
00350         glColor3f(1.0f,1.0f,1.0f);
00351         glBegin(GL_LINE_STRIP);
00352             glVertex2i(m_AbsPos.GetX(),m_AbsPos.GetY());
00353             glVertex2i(m_AbsPos.GetRight(),m_AbsPos.GetY());
00354             glVertex2i(m_AbsPos.GetRight(),m_AbsPos.GetBottom());
00355             glVertex2i(m_AbsPos.GetX(),m_AbsPos.GetBottom());
00356             glVertex2i(m_AbsPos.GetX(),m_AbsPos.GetY());
00357         glEnd();
00358 
00359     }
00360     FontDrawBegin();
00361     glPushMatrix();
00362     for(int iLine=GetTopLine();(iLine-GetTopLine())<GetNumLinesOnScreen() && iLine<GetNumOfLines();iLine++)
00363     {
00364         if(IsSelectLines() && iLine==GetSelectedLine() && IsInFocus())
00365         {
00366             // Disable Texture Mapping
00367             glDisable(GL_TEXTURE_2D);
00368             glDisable(GL_BLEND);
00369             // Draw selected background
00370             glLoadIdentity();
00371             glTranslated(   m_TextPos.GetX(),
00372                             m_TextPos.GetY()+(iLine-GetTopLine())*GetFontSize(),
00373                             0);
00374             glColor4fv(m_BgSelColor);
00375             glBegin(GL_TRIANGLE_STRIP);
00376                 glVertex2i(0, 0);
00377                 glVertex2i(0,GetFontSize());
00378                 glVertex2i(m_TextPos.GetWidth(),0);
00379                 glVertex2i(m_TextPos.GetWidth(),GetFontSize());
00380             glEnd();
00381             // Enable Texture Mapping
00382             glEnable(GL_TEXTURE_2D);
00383             // To make our font transparent!
00384             glEnable(GL_BLEND);
00385         }
00386         unsigned int uiLen=0;
00387         if((int)m_Strings.LenAt(iLine)<m_iShift)
00388             // no need to draw anything
00389             continue;
00390         else if(((int)m_Strings.LenAt(iLine)-m_iShift)*GetFontSize()>GetWidth())
00391             uiLen=(unsigned int)(GetWidth()/GetFontSize())+1;
00392         else
00393             uiLen=m_Strings.LenAt(iLine)-m_iShift;
00394         const char* msg=m_Strings[iLine].data()+m_iShift;
00395         // determine length of the string to be displayed
00396         if(IsSelectLines() && iLine==GetSelectedLine() && !IsInFocus())
00397             FontDraw(m_TextPos.GetX(),m_TextPos.GetY()+(int)((iLine-GetTopLine())*GetFontSize()),
00398                             msg,uiLen,m_BgSelColor);
00399         else
00400             FontDraw(m_TextPos.GetX(),(int)(m_TextPos.GetY()+(iLine-GetTopLine())*GetFontSize()),
00401                             msg,uiLen,m_Color);
00402     }
00403     // Draw cursor if needed
00404     if(m_yShowCursor && (int)m_uiCursorPos>=m_iShift && m_uiCursorPos<=m_iShift+m_Strings.GetCharOnDisp())
00405     {
00406         // Disable Texture Mapping
00407         glDisable(GL_TEXTURE_2D);
00408         glDisable(GL_BLEND);
00409         glLoadIdentity();
00410         glTranslated(m_TextPos.GetX()+(m_uiCursorPos-m_iShift)*(GetFontSize()-GetFontScale()),m_TextPos.GetY(),0.0f);
00411         glColor4fv(m_Color);
00412         glBegin(GL_TRIANGLE_STRIP);
00413             glVertex2i(0,GetFontSize());
00414             glVertex2i(2,GetFontSize());
00415             glVertex2i(0,0);
00416             glVertex2i(2,0);
00417         glEnd();
00418     }
00419     glPopMatrix();
00420     FontDrawEnd();
00421     Tbase::OnDraw();
00422 }
00423 
00424 } // namespace sjgui
00425 
00426 #endif // !defined(SJTEXT_H_INCLUDED)