Bos Wars: textfield.cpp Source File

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00008  *
00009  * Copyright (c) 2004, 2005 darkbits                        Js_./
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00054 
00055 /*
00056  * For comments regarding functions please see the header file. 
00057  */
00058 
00059 #include "guichan/keyinput.h"
00060 #include "guichan/mouseinput.h"
00061 #include "guichan/widgets/textfield.h"
00062 #include "guichan/exception.h"
00063 #include "util.h"
00064 
00065 namespace gcn
00066 {
00067     TextField::TextField()
00068     {
00069         mCaretPosition = 0;
00070         mXScroll = 0;
00071         mSelectStart = 0;
00072         mSelectEndOffset = 0;
00073 
00074         setFocusable(true);
00075 
00076         addMouseListener(this);
00077         addKeyListener(this);
00078         adjustHeight();
00079         setBorderSize(1);    
00080     }
00081   
00082     TextField::TextField(const std::string& text)
00083     {
00084         mCaretPosition = 0;
00085         mXScroll = 0;
00086         mSelectStart = 0;
00087         mSelectEndOffset = 0;
00088 
00089         mText = text;
00090         adjustSize();
00091         setBorderSize(1);
00092         
00093         setFocusable(true);    
00094   
00095         addMouseListener(this);
00096         addKeyListener(this);    
00097     }
00098 
00099     void TextField::setText(const std::string& text)
00100     {
00101         if ((int)text.size() < mCaretPosition )
00102         {
00103             mCaretPosition = text.size();
00104         }
00105     
00106         mText = text;    
00107     }
00108   
00109     void TextField::draw(Graphics* graphics)
00110     {
00111         Font *font;
00112         int x, y;
00113         Color faceColor = getBackgroundColor();
00114         graphics->setColor(faceColor);
00115         graphics->fillRectangle(Rectangle(0, 0, getWidth(), getHeight()));
00116     
00117         if (hasFocus())
00118         {      
00119             drawCaret(graphics, getFont()->getWidth(mText.substr(0, mCaretPosition)) - mXScroll);
00120         }
00121     
00122         graphics->setColor(getForegroundColor());
00123         font = getFont();
00124         graphics->setFont(font);
00125 
00126         x = 1 - mXScroll;
00127         y = 1;
00128 
00129         if (mSelectEndOffset != 0)
00130         {
00131             unsigned int first;
00132             unsigned int len;
00133             int selX;
00134             int selW;
00135             std::string tmpStr;
00136 
00137             getTextSelectionPositions(&first, &len);
00138 
00139             tmpStr = std::string(mText.substr(0, first));
00140             selX = font->getWidth(tmpStr);
00141 
00142             tmpStr = std::string(mText.substr(first, len));
00143             selW = font->getWidth(tmpStr);
00144 
00145             graphics->setColor(Color(127, 127, 127));
00146             graphics->fillRectangle(Rectangle(x + selX, y, selW, font->getHeight()));
00147         }
00148 
00149         graphics->drawText(mText, x, y);    
00150     }
00151 
00152     void TextField::drawBorder(Graphics* graphics)
00153     {
00154         Color faceColor = getBaseColor();
00155         Color highlightColor, shadowColor;
00156         int alpha = getBaseColor().a;
00157         int width = getWidth() + getBorderSize() * 2 - 1;
00158         int height = getHeight() + getBorderSize() * 2 - 1;
00159         highlightColor = faceColor + 0x303030;
00160         highlightColor.a = alpha;
00161         shadowColor = faceColor - 0x303030;
00162         shadowColor.a = alpha;
00163         
00164         unsigned int i;
00165         for (i = 0; i < getBorderSize(); ++i)
00166         {
00167             graphics->setColor(shadowColor);
00168             graphics->drawLine(i,i, width - i, i);
00169             graphics->drawLine(i,i + 1, i, height - i - 1);
00170             graphics->setColor(highlightColor);
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 TextField::drawCaret(Graphics* graphics, int x)
00177     {
00178         graphics->setColor(getForegroundColor());
00179         graphics->drawLine(x, getHeight() - 2, x, 1);    
00180     }
00181   
00182     void TextField::mousePress(int x, int y, int button)
00183     {
00184         if (hasMouse() && button == MouseInput::LEFT)
00185         {
00186             mCaretPosition = getFont()->getStringIndexAt(mText, x + mXScroll);
00187             mSelectStart = mCaretPosition;
00188             mSelectEndOffset = 0;
00189             fixScroll();
00190         }
00191         else if (hasMouse() && button == MouseInput::MIDDLE)
00192         {
00193             std::string str;
00194             if (GetClipboard(str) >= 0) {
00195                 for (size_t i = 0; i < str.size(); ++i) {
00196                     keyPress(Key(str[i]));
00197                 }
00198             }
00199         }
00200     }
00201 
00202     void TextField::mouseMotion(int x, int y)
00203     {
00204         if (isDragged() && mClickButton == MouseInput::LEFT)
00205         {
00206             mCaretPosition = getFont()->getStringIndexAt(mText, x + mXScroll);
00207             mSelectEndOffset = mCaretPosition - mSelectStart;
00208             setDirty(true);
00209         }
00210     }
00211 
00212     bool TextField::keyPress(const Key& key)
00213     {
00214         bool ret = false;
00215         unsigned int selFirst;
00216         unsigned int selLen;
00217 
00218         getTextSelectionPositions(&selFirst, &selLen);
00219 
00220         if (key.getValue() == Key::LEFT)
00221         {
00222             if (mCaretPosition > 0) {
00223                 mCaretPosition = UTF8GetPrev(mText, mCaretPosition);
00224                 if (mCaretPosition < 0) {
00225                     throw GCN_EXCEPTION("Invalid UTF8.");
00226                 }
00227 
00228                 if (key.isShiftPressed()) {
00229                     --mSelectEndOffset;
00230                 } else {
00231                     mSelectStart = mCaretPosition;
00232                     mSelectEndOffset = 0;
00233                 }
00234             } else if (!key.isShiftPressed()) {
00235                 mSelectStart = mCaretPosition;
00236                 mSelectEndOffset = 0;
00237             }
00238 
00239             ret = true;
00240         }
00241 
00242         else if (key.getValue() == Key::RIGHT)
00243         {
00244             if (mCaretPosition < (int)mText.size()) {
00245                 mCaretPosition = UTF8GetNext(mText, mCaretPosition);
00246                 if (mCaretPosition > (int)mText.size()) {
00247                     throw GCN_EXCEPTION("Invalid UTF8.");
00248                 }
00249 
00250                 if (key.isShiftPressed()) {
00251                     ++mSelectEndOffset;
00252                 } else {
00253                     mSelectStart = mCaretPosition;
00254                     mSelectEndOffset = 0;
00255                 }
00256             } else if (!key.isShiftPressed()) {
00257                 mSelectStart = mCaretPosition;
00258                 mSelectEndOffset = 0;
00259             }
00260 
00261             ret = true;
00262         }
00263 
00264         else if (key.getValue() == Key::DELETE )
00265         {
00266             if (selLen > 0) {
00267                 mText.erase(selFirst, selLen);
00268                 mCaretPosition = selFirst;
00269                 mSelectStart = selFirst;
00270                 mSelectEndOffset = 0;
00271             } else if (mCaretPosition < (int)mText.size()) {
00272                 int newpos = UTF8GetNext(mText, mCaretPosition);
00273                 if (mCaretPosition > (int)mText.size()) {
00274                     throw GCN_EXCEPTION("Invalid UTF8.");
00275                 }
00276                 mText.erase(mCaretPosition, newpos - mCaretPosition);
00277                 ret = true;
00278             }
00279         }
00280 
00281         else if (key.getValue() == Key::BACKSPACE || key.getValue() == 'h' - 'a' + 1)
00282         {
00283             if (selLen > 0) {
00284                 mText.erase(selFirst, selLen);
00285                 mCaretPosition = selFirst;
00286                 mSelectStart = selFirst;
00287                 mSelectEndOffset = 0;
00288             } else if (mCaretPosition > 0) {
00289                 int newpos = UTF8GetPrev(mText, mCaretPosition);
00290                 if (mCaretPosition < 0) {
00291                     throw GCN_EXCEPTION("Invalid UTF8.");
00292                 }
00293                 mText.erase(newpos, mCaretPosition - newpos);
00294                 mCaretPosition = newpos;
00295                 ret = true;
00296             }
00297         }
00298 
00299         else if (key.getValue() == Key::ENTER)
00300         {
00301             generateAction();
00302             ret = true;
00303         }
00304 
00305         else if (key.getValue() == Key::HOME || key.getValue() == 'a' - 'a' + 1) // ctrl-a
00306         {
00307             if (key.isShiftPressed()) {
00308                 mSelectEndOffset -= mCaretPosition;
00309             } else {
00310                 mSelectStart = 0;
00311                 mSelectEndOffset = 0;
00312             }
00313             mCaretPosition = 0;
00314 
00315             ret = true;
00316         }    
00317 
00318         else if (key.getValue() == Key::END || key.getValue() == 'e' - 'a' + 1)  //ctrl-e
00319         {
00320             if (key.isShiftPressed()) {
00321                 mSelectEndOffset += mText.size() - mCaretPosition;
00322             } else {
00323                 mSelectStart = mText.size();
00324                 mSelectEndOffset = 0;
00325             }
00326             mCaretPosition = mText.size();
00327 
00328             ret = true;
00329         }    
00330 
00331         else if (key.getValue() == 'u' - 'a' + 1) // ctrl-u
00332         {
00333             setText("");
00334             ret = true;
00335         }
00336 
00337         else if (key.getValue() == 'v' - 'a' + 1) // ctrl-v
00338         {
00339             std::string str;
00340 
00341             if (selLen > 0) {
00342                 mText.erase(selFirst, selLen);
00343                 mCaretPosition = selFirst;
00344                 mSelectStart = selFirst;
00345                 mSelectEndOffset = 0;
00346             }
00347 
00348             if (GetClipboard(str) >= 0) {
00349                 for (size_t i = 0; i < str.size(); ++i) {
00350                     keyPress(Key(str[i]));
00351                 }
00352                 ret = true;
00353             }
00354         }
00355 
00356         else if (key.isCharacter())
00357         {
00358             if (selLen > 0) {
00359                 mText.erase(selFirst, selLen);
00360                 mCaretPosition = selFirst;
00361                 mSelectStart = selFirst;
00362                 mSelectEndOffset = 0;
00363             }
00364 
00365             mText.insert(mCaretPosition,key.toString());
00366             mCaretPosition = UTF8GetNext(mText, mCaretPosition);
00367             if (mCaretPosition > (int)mText.size()) {
00368                 throw GCN_EXCEPTION("Invalid UTF8.");
00369             }
00370             mSelectStart = mCaretPosition;
00371             mSelectEndOffset = 0;
00372             ret = true;
00373         }
00374 
00375         fixScroll();
00376         setDirty(true);
00377         return ret;
00378     }
00379 
00380     void TextField::adjustSize()
00381     {
00382         setWidth(getFont()->getWidth(mText) + 4);
00383         adjustHeight();
00384 
00385         fixScroll();    
00386     }
00387   
00388     void TextField::adjustHeight()
00389     {
00390         setHeight(getFont()->getHeight() + 2);    
00391     }
00392 
00393     void TextField::fixScroll()
00394     {
00395         if (hasFocus())
00396         {
00397             int caretX = getFont()->getWidth(mText.substr(0, mCaretPosition));
00398 
00399             if (caretX - mXScroll > getWidth() - 4)
00400             {
00401                 mXScroll = caretX - getWidth() + 4;
00402             }
00403             else if (caretX - mXScroll < getFont()->getWidth(" "))
00404             {
00405                 mXScroll = caretX - getFont()->getWidth(" ");
00406         
00407                 if (mXScroll < 0)
00408                 {
00409                     mXScroll = 0;
00410                 }
00411             }
00412         }
00413     }
00414 
00415     void TextField::setCaretPosition(unsigned int position)
00416     {
00417         if (position > mText.size())
00418         {
00419             mCaretPosition = mText.size();
00420         }
00421         else
00422         {    
00423             mCaretPosition = position;
00424         }
00425 
00426         fixScroll();    
00427     }
00428 
00429     unsigned int TextField::getCaretPosition() const
00430     {
00431         return mCaretPosition;    
00432     }
00433 
00434     void TextField::getTextSelectionPositions(unsigned int* first, unsigned int* len)
00435     {
00436         if (mSelectEndOffset < 0)
00437         {
00438             *first = mSelectStart + mSelectEndOffset;
00439             *len = -mSelectEndOffset;
00440         }
00441         else
00442         {
00443             *first = mSelectStart;
00444             *len = mSelectEndOffset;
00445         }
00446     }
00447 
00448     const std::string& TextField::getText() const
00449     {
00450         return mText;    
00451     }
00452   
00453     void TextField::fontChanged()
00454     {
00455         fixScroll();
00456     }
00457 }