/*************************************************************************** exerciseconvert.h ------------------- begin : 2004/06/04 copyright : (C) 2004 by Sebastian Stein email : seb.kde@hpfsc.de ***************************************************************************/ /*************************************************************************** * * * This program is free software; you can redistribute it and/or modify * * it under the terms of the GNU General Public License as published by * * the Free Software Foundation; either version 2 of the License, or * * (at your option) any later version. * * * ***************************************************************************/ #include "exerciseconvert.h" #include "exerciseconvert.moc" /* these includes are needed for KDE support */ #include #include #include #include /* these includes are needed for Qt support */ #include #include #include #include #include #include /* standard C++ library includes */ #include #include "rationalwidget.h" #include "resultwidget.h" /* ----- public member functions ----- */ /* constructor */ ExerciseConvert::ExerciseConvert(TQWidget * parent, const char * name): ExerciseBase(parent, name) { #ifdef DEBUG kdDebug() << "constructor ExerciseConvert()" << endl; #endif /* create a new task */ TQApplication::setOverrideCursor(waitCursor); /* show the sand clock */ createTask(); TQApplication::restoreOverrideCursor(); /* show the normal cursor */ // the next thing to do on a button click would be to check the entered // result m_currentState = _CHECK_TASK; baseWidget = new TQWidget(this, "baseWidget"); baseGrid = new TQGridLayout(this, 1, 1, 0, -1, "baseGrid"); baseGrid->addWidget(baseWidget, 0, 0); // this is a VBox realLayout = new TQVBoxLayout(baseWidget, 5, 5, "realLayout"); // add a spacer at the top of the VBox TQSpacerItem * v_spacer = new TQSpacerItem(1, 1); realLayout->addItem(v_spacer); // now a line holding the task, input fields and result TQHBoxLayout * taskLineHBoxLayout = new TQHBoxLayout(5, "taskLineHBoxLayout"); realLayout->addLayout(taskLineHBoxLayout); // first left is the rational widget m_rationalWidget = new RationalWidget(baseWidget, "m_rationalWidget", m_number, m_periodStart, m_periodLength); // taskLineHBoxLayout->addWidget(m_rationalWidget); // now we have the input fields aligned in a VBox TQVBoxLayout * inputLayout = new TQVBoxLayout(5, "inputLayout"); // taskLineHBoxLayout->addLayout(inputLayout); // to validate, that the input is an int KIntValidator *valnum = new KIntValidator( this ); /* add input box so the user can enter numerator */ numer_edit = new TQLineEdit(baseWidget, "numer_edit"); numer_edit->setValidator( valnum ); // use the int validator TQToolTip::add(numer_edit, i18n("Enter the numerator of your result")); inputLayout->addWidget(numer_edit); /* add a line between the edit boxes */ edit_line = new TQFrame(baseWidget, "edit_line"); edit_line->setGeometry(TQRect(100, 100, 20, 20)); edit_line->setFrameStyle(TQFrame::HLine | TQFrame::Sunken); inputLayout->addWidget(edit_line); /* add input box so the user can enter denominator */ deno_edit = new TQLineEdit(baseWidget, "deno_edit"); deno_edit->setValidator( valnum ); // use the int validator TQToolTip::add(deno_edit, i18n("Enter the denominator of your result")); inputLayout->addWidget(deno_edit); // next is the result widget m_resultWidget = new ResultWidget(baseWidget, "m_resultWidget", m_result); // taskLineHBoxLayout->addWidget(m_resultWidget); m_resultWidget->hide(); // at the right end we have a label just showing CORRECT or WRONG result_label = new TQLabel(baseWidget, "result_lable"); result_label->setText(i18n("WRONG")); // taskLineHBoxLayout->addWidget(result_label); result_label->hide(); // add another spacer in the middle of the VBox v_spacer = new TQSpacerItem(1, 1, TQSizePolicy::Expanding, TQSizePolicy::Minimum); // taskLineHBoxLayout->addItem(v_spacer); // --- that is the end of the horizontal line --- // in RTL desktops, we still need to allign the // execise to the left. On Qt4, you can set the direction // of the tqlayout to LTR (instead of inherit), but on Qt3 // the only way of fixing it is inserting the widgets in reversed // order to the tqlayout. // // if you need help with this feel free to contact me - Diego ) // This should fix parts of bug #116831 if (TQApplication::reverseLayout()) { taskLineHBoxLayout->addItem(v_spacer); taskLineHBoxLayout->addWidget(result_label); taskLineHBoxLayout->addWidget(m_resultWidget); taskLineHBoxLayout->addLayout(inputLayout); taskLineHBoxLayout->addWidget(m_rationalWidget); } else { taskLineHBoxLayout->addWidget(m_rationalWidget); taskLineHBoxLayout->addLayout(inputLayout); taskLineHBoxLayout->addWidget(m_resultWidget); taskLineHBoxLayout->addWidget(result_label); taskLineHBoxLayout->addItem(v_spacer); } // add another spacer in the middle of the VBox v_spacer = new TQSpacerItem(1, 1); realLayout->addItem(v_spacer); // the lower part of the VBox holds just a right aligned button TQHBoxLayout * lowerHBox = new TQHBoxLayout(1, "lowerHBox"); realLayout->addLayout(lowerHBox); lowerHBox->addStretch(100); // the right aligned button m_checkButton = new TQPushButton( baseWidget, "m_checkButton" ); m_checkButton->setText(i18n("&Check Task")); m_checkButton->setDefault(true); // is the default button of the dialog TQToolTip::add(m_checkButton, i18n("Click on this button to check your result. The button will not work if you have not entered a result yet.")); lowerHBox->addWidget(m_checkButton, 1, Qt::AlignRight); TQObject::connect(m_checkButton, TQT_SIGNAL(clicked()), this, TQT_SLOT(slotCheckButtonClicked())); // that the user can start typing without moving the focus numer_edit->setFocus(); // show the whole tqlayout baseWidget->show(); // add tooltip and qwhatsthis help to the widget TQToolTip::add(this, i18n("In this exercise you have to convert a number into a fraction.")); TQWhatsThis::add(this, i18n("In this exercise you have to convert a given number into a fraction by entering numerator and denominator. Do not forget to reduce the result!")); } /* destructor */ ExerciseConvert::~ExerciseConvert() { #ifdef DEBUG kdDebug() << "destructor ExerciseConvert()" << endl; #endif /* no need to delete any child widgets, Qt does it by itself */ } /** resets the current state, creates a new task and count the last task as * wrong, if it wasn't solved (in _NEXT_TASK state) yet * mainly used after changing the task parameters */ void ExerciseConvert::forceNewTask() { #ifdef DEBUG kdDebug() << "forceNewTask ExerciseConvert()" << endl; #endif if (m_currentState == _CHECK_TASK) { // emit the signal for wrong signalExerciseSolvedWrong(); } m_currentState = _CHECK_TASK; m_checkButton->setText(i18n("&Check Task")); // generate next task (void) nextTask(); } /* ------ public slots ------ */ void ExerciseConvert::update() { // call update of components m_rationalWidget->updateAndRepaint(); m_resultWidget->updateAndRepaint(); // update for itself ((TQWidget *) this)->update(); } /* ------ private member functions ------ */ void ExerciseConvert::createTask() { // the tasks are hardcoded here; there are some algorithms to convert // rational numbers to fractions, but it is not worth the effort here switch(int((double(rand()) / RAND_MAX) * 18 + 1)) { case 0 : m_number = KGlobal::locale()->formatNumber(0.5, 1); m_periodStart = 2; m_periodLength = 0; m_result = ratio(1, 2); break; case 1 : m_number = KGlobal::locale()->formatNumber(0.3, 1); m_periodStart = 2; m_periodLength = 1; m_result = ratio(1, 3); break; case 2 : m_number = KGlobal::locale()->formatNumber(0.6, 1); m_periodStart = 2; m_periodLength = 1; m_result = ratio(2, 3); break; case 3 : m_number = KGlobal::locale()->formatNumber(0.25, 2); m_periodStart = 2; m_periodLength = 0; m_result = ratio(1, 4); break; case 4 : m_number = KGlobal::locale()->formatNumber(0.75, 2); m_periodStart = 2; m_periodLength = 0; m_result = ratio(3, 4); break; case 5 : m_number = KGlobal::locale()->formatNumber(0.2, 1); m_periodStart = 2; m_periodLength = 0; m_result = ratio(1, 5); break; case 6 : m_number = KGlobal::locale()->formatNumber(0.4, 1); m_periodStart = 2; m_periodLength = 0; m_result = ratio(2, 5); break; case 7 : m_number = KGlobal::locale()->formatNumber(0.6, 1); m_periodStart = 2; m_periodLength = 0; m_result = ratio(3, 5); break; case 8 : m_number = KGlobal::locale()->formatNumber(0.8, 1); m_periodStart = 2; m_periodLength = 0; m_result = ratio(4, 5); break; case 9 : m_number = KGlobal::locale()->formatNumber(0.16, 2); m_periodStart = 3; m_periodLength = 1; m_result = ratio(1, 6); break; case 10 : m_number = KGlobal::locale()->formatNumber(0.142857, 6); m_periodStart = 2; m_periodLength = 6; m_result = ratio(1, 7); break; case 11 : m_number = KGlobal::locale()->formatNumber(0.125, 3); m_periodStart = 2; m_periodLength = 0; m_result = ratio(1, 8); break; case 12 : m_number = KGlobal::locale()->formatNumber(0.375, 3); m_periodStart = 2; m_periodLength = 0; m_result = ratio(3, 8); break; case 13 : m_number = KGlobal::locale()->formatNumber(0.1, 1); m_periodStart = 2; m_periodLength = 1; m_result = ratio(1, 9); break; case 14 : m_number = KGlobal::locale()->formatNumber(0.1, 1); m_periodStart = 2; m_periodLength = 0; m_result = ratio(1, 10); break; case 15 : m_number = KGlobal::locale()->formatNumber(0.05, 2); m_periodStart = 2; m_periodLength = 0; m_result = ratio(1, 20); break; case 16 : m_number = KGlobal::locale()->formatNumber(0.01, 2); m_periodStart = 2; m_periodLength = 0; m_result = ratio(1, 100); break; case 17 : m_number = KGlobal::locale()->formatNumber(0.83, 2); m_periodStart = 3; m_periodLength = 1; m_result = ratio(5, 6); break; default : case 18 : m_number = KGlobal::locale()->formatNumber(0.001, 3); m_periodStart = 2; m_periodLength = 0; m_result = ratio(1, 1000); break; } return; } /** - checks, if the user solved the task correctly - emits signals if task was solved correctly or wrong */ void ExerciseConvert::showResult() { TQString tmp_str; /* to build a string for a label */ TQPalette pal; TQColorGroup cg; ratio entered_result; // change the tooltip of the check button TQToolTip::add(m_checkButton, i18n("Click on this button to get to the next task.")); numer_edit->setEnabled(false); deno_edit->setEnabled(false); m_resultWidget->setResult(m_result); m_resultWidget->show(); // an empty numerator field will be interpreted as 0 if (numer_edit->text().isEmpty() == true) numer_edit->setText("0"); // an empty denominator field will be interpreted as 1 if (deno_edit->text().isEmpty() == true) deno_edit->setText("1"); /* store the entered result to check it, but without reducing */ entered_result.setNumerator(numer_edit->text().toInt(), false); entered_result.setDenominator(deno_edit->text().toInt(), false); // check the entered result; 0/1 == 0/5 -> true, // but 0/1 == 0/0 -> false // a 0 for denominator is never allowed (always counted as wrong) // // we have to get the 0 directly from the input field, because // Ratio::setDenominator(0, false) will set the denominator to 1 to ensure // the Ratio is valid if ( (deno_edit->text().toInt() != 0) && ((entered_result == m_result) || (m_result.numerator() == 0 && entered_result.numerator() == 0)) ) { // emit the signal for correct signalExerciseSolvedCorrect(); /* yes, the user entered the correct result */ result_label->setText(i18n("CORRECT")); pal = result_label->palette(); /* set green font color */ cg = pal.active(); cg.setColor(TQColorGroup::Foreground, TQColor(6, 179, 0)); pal.setActive(cg); cg = pal.inactive(); cg.setColor(TQColorGroup::Foreground, TQColor(6, 179, 0)); pal.setInactive(cg); result_label->setPalette(pal); result_label->show(); /* show the result at the end of the task */ } else { // emit the signal for wrong signalExerciseSolvedWrong(); /* no, the user entered the wrong result */ result_label->setText(i18n("WRONG")); pal = result_label->palette(); /* set red font color */ cg = pal.active(); cg.setColor(TQColorGroup::Foreground, TQColor(red)); pal.setActive(cg); cg = pal.inactive(); cg.setColor(TQColorGroup::Foreground, TQColor(red)); pal.setInactive(cg); result_label->setPalette(pal); result_label->show(); /* show the result at the end of the task */ // if the user entered a 0 for the denominator (division by 0) we have to // get the 0 directly from the input field, because // Ratio::setDenominator(0, true) will set the denominator to 1 to ensure // the Ratio is valid if (deno_edit->text().toInt() == 0) { KMessageBox::information(this, i18n("You entered a 0 as the denominator. This means division by zero, which is not allowed. This task will be counted as not correctly solved.")); } else { /* maybe the entered ratio was not reduced */ entered_result.reduce(); if (entered_result == m_result) KMessageBox::information(this, i18n("You entered the correct result, but not reduced.\nAlways enter your results as reduced. This task will be counted as not correctly solved.")); } } /* if (entered_result == result) */ return; } /** generate the next task and show it to the user */ void ExerciseConvert::nextTask() { // change the tooltip of the check button TQToolTip::add(m_checkButton, i18n("Click on this button to check your result. The button will not work if you have not entered a result yet.")); numer_edit->setEnabled(true); deno_edit->setEnabled(true); result_label->hide(); /* do not show the result at the end of the task */ m_resultWidget->hide(); /* clear user input */ deno_edit->setText(""); numer_edit->setText(""); numer_edit->setFocus(); /* create a new task */ TQApplication::setOverrideCursor(waitCursor); /* show the sand clock */ createTask(); TQApplication::restoreOverrideCursor(); /* show the normal cursor */ // update the task widget m_rationalWidget->setRational(m_number, m_periodStart, m_periodLength); return; } /* ------ private slots ------ */ void ExerciseConvert::slotCheckButtonClicked() { if (m_currentState == _CHECK_TASK) { // if nothing has been entered by the user, we don't check the result yet if (numer_edit->text().isEmpty() == true && deno_edit->text().isEmpty() == true) return; m_currentState = _NEXT_TASK; m_checkButton->setText(i18n("N&ext Task")); (void) showResult(); } else { m_currentState = _CHECK_TASK; m_checkButton->setText(i18n("&Check Task")); (void) nextTask(); } return; }