textbox.cpp

00001 /*      _______   __   __   __   ______   __   __   _______   __   __
00002  *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
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00007  * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
00008  *
00009  * Copyright (c) 2004, 2005, 2006 Olof Naessén and Per Larsson
00010  *
00011  *                                                         Js_./
00012  * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
00013  * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
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00055  */
00056 
00057 /*
00058  * For comments regarding functions please see the header file.
00059  */
00060 
00061 #include "guichan/widgets/textbox.hpp"
00062 
00063 #include "guichan/basiccontainer.hpp"
00064 #include "guichan/font.hpp"
00065 #include "guichan/graphics.hpp"
00066 #include "guichan/key.hpp"
00067 #include "guichan/mouseinput.hpp"
00068 
00069 namespace gcn
00070 {
00071     TextBox::TextBox()
00072     {
00073         mCaretColumn = 0;
00074         mCaretRow = 0;
00075         mEditable = true;
00076         mOpaque = true;
00077 
00078         setFocusable(true);
00079 
00080         addMouseListener(this);
00081         addKeyListener(this);
00082         adjustSize();
00083         setBorderSize(1);
00084         setText("");
00085     }
00086 
00087     TextBox::TextBox(const std::string& text)
00088     {
00089         mCaretColumn = 0;
00090         mCaretRow = 0;
00091         mEditable = true;
00092         mOpaque = true;
00093 
00094         setText(text);
00095 
00096         setFocusable(true);
00097 
00098         addMouseListener(this);
00099         addKeyListener(this);
00100         adjustSize();
00101         setBorderSize(1);
00102     }
00103 
00104     void TextBox::setText(const std::string& text)
00105     {
00106         mCaretColumn = 0;
00107         mCaretRow = 0;
00108 
00109         mTextRows.clear();
00110 
00111         std::string::size_type pos, lastPos = 0;
00112         int length;
00113         do
00114         {
00115             pos = text.find("\n", lastPos);
00116 
00117             if (pos != std::string::npos)
00118             {
00119                 length = pos - lastPos;
00120             }
00121             else
00122             {
00123                 length = text.size() - lastPos;
00124             }
00125             std::string sub = text.substr(lastPos, length);
00126             mTextRows.push_back(sub);
00127             lastPos = pos + 1;
00128 
00129         } while (pos != std::string::npos);
00130 
00131         adjustSize();
00132     }
00133 
00134     void TextBox::draw(Graphics* graphics)
00135     {
00136         unsigned int i;
00137 
00138         if (mOpaque)
00139         {
00140             graphics->setColor(getBackgroundColor());
00141             graphics->fillRectangle(Rectangle(0, 0, getWidth(), getHeight()));
00142         }
00143 
00144         if (isFocused() && isEditable())
00145         {
00146             drawCaret(graphics, getFont()->getWidth(mTextRows[mCaretRow].substr(0, mCaretColumn)), mCaretRow * getFont()->getHeight());
00147         }
00148 
00149         graphics->setColor(getForegroundColor());
00150         graphics->setFont(getFont());
00151 
00152         for (i = 0; i < mTextRows.size(); i++)
00153         {
00154             // Move the text one pixel so we can have a caret before a letter.
00155             graphics->drawText(mTextRows[i], 1, i * getFont()->getHeight());
00156         }
00157     }
00158 
00159     void TextBox::drawBorder(Graphics* graphics)
00160     {
00161         int width = getWidth() + getBorderSize() * 2 - 1;
00162         int height = getHeight() + getBorderSize() * 2 - 1;
00163 
00164         graphics->setColor(getBackgroundColor());
00165 
00166         unsigned int i;
00167         for (i = 0; i < getBorderSize(); ++i)
00168         {
00169             graphics->drawLine(i,i, width - i, i);
00170             graphics->drawLine(i,i + 1, i, height - i - 1);
00171             graphics->drawLine(width - i,i + 1, width - i, height - i);
00172             graphics->drawLine(i,height - i, width - i - 1, height - i);
00173         }
00174     }
00175 
00176     void TextBox::drawCaret(Graphics* graphics, int x, int y)
00177     {
00178         graphics->setColor(getForegroundColor());
00179         graphics->drawLine(x, getFont()->getHeight() + y, x, y);
00180     }
00181 
00182     void TextBox::mousePress(int x, int y, int button)
00183     {
00184         if (hasMouse() && button == MouseInput::LEFT)
00185         {
00186             mCaretRow = y / getFont()->getHeight();
00187 
00188             if (mCaretRow >= (int)mTextRows.size())
00189             {
00190                 mCaretRow = mTextRows.size() - 1;
00191             }
00192 
00193             mCaretColumn = getFont()->getStringIndexAt(mTextRows[mCaretRow], x);
00194         }
00195     }
00196 
00197     void TextBox::keyPress(const Key& key)
00198     {
00199         if (key.getValue() == Key::LEFT)
00200         {
00201             --mCaretColumn;
00202             if (mCaretColumn < 0)
00203             {
00204                 --mCaretRow;
00205 
00206                 if (mCaretRow < 0)
00207                 {
00208                     mCaretRow = 0;
00209                     mCaretColumn = 0;
00210                 }
00211                 else
00212                 {
00213                     mCaretColumn = mTextRows[mCaretRow].size();
00214                 }
00215             }
00216         }
00217 
00218         else if (key.getValue() == Key::RIGHT)
00219         {
00220             ++mCaretColumn;
00221             if (mCaretColumn > (int)mTextRows[mCaretRow].size())
00222             {
00223                 ++mCaretRow;
00224 
00225                 if (mCaretRow >= (int)mTextRows.size())
00226                 {
00227                     mCaretRow = mTextRows.size() - 1;
00228                     if (mCaretRow < 0)
00229                     {
00230                         mCaretRow = 0;
00231                     }
00232 
00233                     mCaretColumn = mTextRows[mCaretRow].size();
00234                 }
00235                 else
00236                 {
00237                     mCaretColumn = 0;
00238                 }
00239             }
00240         }
00241 
00242         else if (key.getValue() == Key::DOWN)
00243         {
00244             setCaretRow(mCaretRow + 1);
00245         }
00246 
00247         else if (key.getValue() == Key::UP)
00248         {
00249             setCaretRow(mCaretRow - 1);
00250         }
00251 
00252         else if (key.getValue() == Key::HOME)
00253         {
00254             mCaretColumn = 0;
00255         }
00256 
00257         else if (key.getValue() == Key::END)
00258         {
00259             mCaretColumn = mTextRows[mCaretRow].size();
00260         }
00261 
00262         else if (key.getValue() == Key::ENTER && mEditable)
00263         {
00264             mTextRows.insert(mTextRows.begin() + mCaretRow + 1,
00265                              mTextRows[mCaretRow].substr(mCaretColumn, mTextRows[mCaretRow].size() - mCaretColumn));
00266             mTextRows[mCaretRow].resize(mCaretColumn);
00267             ++mCaretRow;
00268             mCaretColumn = 0;
00269         }
00270 
00271         else if (key.getValue() == Key::BACKSPACE
00272                  && mCaretColumn != 0
00273                  && mEditable)
00274         {
00275             mTextRows[mCaretRow].erase(mCaretColumn - 1, 1);
00276             --mCaretColumn;
00277         }
00278 
00279         else if (key.getValue() == Key::BACKSPACE
00280                  && mCaretColumn == 0
00281                  && mCaretRow != 0
00282                  && mEditable)
00283         {
00284             mCaretColumn = mTextRows[mCaretRow - 1].size();
00285             mTextRows[mCaretRow - 1] += mTextRows[mCaretRow];
00286             mTextRows.erase(mTextRows.begin() + mCaretRow);
00287             --mCaretRow;
00288         }
00289 
00290         else if (key.getValue() == Key::DELETE
00291                  && mCaretColumn < (int)mTextRows[mCaretRow].size()
00292                  && mEditable)
00293         {
00294             mTextRows[mCaretRow].erase(mCaretColumn, 1);
00295         }
00296 
00297         else if (key.getValue() == Key::DELETE
00298                  && mCaretColumn == (int)mTextRows[mCaretRow].size()
00299                  && mCaretRow < ((int)mTextRows.size() - 1)
00300                  && mEditable)
00301         {
00302             mTextRows[mCaretRow] += mTextRows[mCaretRow + 1];
00303             mTextRows.erase(mTextRows.begin() + mCaretRow + 1);
00304         }
00305 
00306         else if(key.getValue() == Key::PAGE_UP)
00307         {
00308             BasicContainer* par = getParent();
00309 
00310             if (par != NULL)
00311             {
00312                 int rowsPerPage = par->getChildrenArea().height / getFont()->getHeight();
00313                 mCaretRow -= rowsPerPage;
00314 
00315                 if (mCaretRow < 0)
00316                 {
00317                     mCaretRow = 0;
00318                 }
00319             }
00320         }
00321 
00322         else if(key.getValue() == Key::PAGE_DOWN)
00323         {
00324             BasicContainer* par = getParent();
00325 
00326             if (par != NULL)
00327             {
00328                 int rowsPerPage = par->getChildrenArea().height / getFont()->getHeight();
00329                 mCaretRow += rowsPerPage;
00330 
00331                 if (mCaretRow >= (int)mTextRows.size())
00332                 {
00333                     mCaretRow = mTextRows.size() - 1;
00334                 }
00335             }
00336         }
00337 
00338         else if(key.getValue() == Key::TAB
00339                 && mEditable)
00340         {
00341             mTextRows[mCaretRow].insert(mCaretColumn,std::string("    "));
00342             mCaretColumn += 4;
00343         }
00344 
00345         else if (key.isCharacter()
00346                  && mEditable)
00347         {
00348             mTextRows[mCaretRow].insert(mCaretColumn,std::string(1,(char)key.getValue()));
00349             ++mCaretColumn;
00350         }
00351 
00352         adjustSize();
00353         scrollToCaret();
00354     }
00355 
00356     void TextBox::adjustSize()
00357     {
00358         unsigned int i;
00359         int width = 0;
00360         for (i = 0; i < mTextRows.size(); ++i)
00361         {
00362             int w = getFont()->getWidth(mTextRows[i]);
00363             if (width < w)
00364             {
00365                 width = w;
00366             }
00367         }
00368 
00369         setWidth(width + 1);
00370         setHeight(getFont()->getHeight() * mTextRows.size());
00371     }
00372 
00373     void TextBox::setCaretPosition(unsigned int position)
00374     {
00375         int row;
00376 
00377         for (row = 0; row < (int)mTextRows.size(); row++)
00378         {
00379             if (position <= mTextRows[row].size())
00380             {
00381                 mCaretRow = row;
00382                 mCaretColumn = position;
00383                 return; // we are done
00384             }
00385             else
00386             {
00387                 position--;
00388             }
00389         }
00390 
00391         // position beyond end of text
00392         mCaretRow = mTextRows.size() - 1;
00393         mCaretColumn = mTextRows[mCaretRow].size();
00394     }
00395 
00396     unsigned int TextBox::getCaretPosition() const
00397     {
00398         int pos = 0, row;
00399 
00400         for (row = 0; row < mCaretRow; row++)
00401         {
00402             pos += mTextRows[row].size();
00403         }
00404 
00405         return pos + mCaretColumn;
00406     }
00407 
00408     void TextBox::setCaretRowColumn(int row, int column)
00409     {
00410         setCaretRow(row);
00411         setCaretColumn(column);
00412     }
00413 
00414     void TextBox::setCaretRow(int row)
00415     {
00416         mCaretRow = row;
00417 
00418         if (mCaretRow >= (int)mTextRows.size())
00419         {
00420             mCaretRow = mTextRows.size() - 1;
00421         }
00422 
00423         if (mCaretRow < 0)
00424         {
00425             mCaretRow = 0;
00426         }
00427 
00428         setCaretColumn(mCaretColumn);
00429     }
00430 
00431     unsigned int TextBox::getCaretRow() const
00432     {
00433         return mCaretRow;
00434     }
00435 
00436     void TextBox::setCaretColumn(int column)
00437     {
00438         mCaretColumn = column;
00439 
00440         if (mCaretColumn > (int)mTextRows[mCaretRow].size())
00441         {
00442             mCaretColumn = mTextRows[mCaretRow].size();
00443         }
00444 
00445         if (mCaretColumn < 0)
00446         {
00447             mCaretColumn = 0;
00448         }
00449     }
00450 
00451     unsigned int TextBox::getCaretColumn() const
00452     {
00453         return mCaretColumn;
00454     }
00455 
00456     const std::string& TextBox::getTextRow(int row) const
00457     {
00458         return mTextRows[row];
00459     }
00460 
00461     void TextBox::setTextRow(int row, const std::string& text)
00462     {
00463         mTextRows[row] = text;
00464 
00465         if (mCaretRow == row)
00466         {
00467             setCaretColumn(mCaretColumn);
00468         }
00469 
00470         adjustSize();
00471     }
00472 
00473     unsigned int TextBox::getNumberOfRows() const
00474     {
00475         return mTextRows.size();
00476     }
00477 
00478     std::string TextBox::getText() const
00479     {
00480         if (mTextRows.size() == 0)
00481         {
00482             return std::string("");
00483         }
00484 
00485         int i;
00486         std::string text;
00487 
00488         for (i = 0; i < (int)mTextRows.size() - 1; ++i)
00489         {
00490             text = text + mTextRows[i] + "\n";
00491         }
00492 
00493         text = text + mTextRows[i];
00494 
00495         return text;
00496     }
00497 
00498     void TextBox::fontChanged()
00499     {
00500         adjustSize();
00501     }
00502 
00503     void TextBox::scrollToCaret()
00504     {
00505         BasicContainer *par = getParent();
00506         if (par == NULL)
00507         {
00508             return;
00509         }
00510 
00511         Rectangle scroll;
00512         scroll.x = getFont()->getWidth(mTextRows[mCaretRow].substr(0, mCaretColumn));
00513         scroll.y = getFont()->getHeight() * mCaretRow;
00514         scroll.width = getFont()->getWidth(" ");
00515         scroll.height = getFont()->getHeight() + 2; // add 2 for some extra space
00516         par->showWidgetPart(this,scroll);
00517     }
00518 
00519     void TextBox::setEditable(bool editable)
00520     {
00521         mEditable = editable;
00522     }
00523 
00524     bool TextBox::isEditable() const
00525     {
00526         return mEditable;
00527     }
00528 
00529     void TextBox::addRow(const std::string row)
00530     {
00531         mTextRows.push_back(row);
00532         adjustSize();
00533     }
00534 
00535     bool TextBox::isOpaque()
00536     {
00537         return mOpaque;
00538     }
00539 
00540     void TextBox::setOpaque(bool opaque)
00541     {
00542         mOpaque = opaque;
00543     }
00544 }

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