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Diffstat (limited to 'kbruch/src/exercisecompare.cpp')
| -rw-r--r-- | kbruch/src/exercisecompare.cpp | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/kbruch/src/exercisecompare.cpp b/kbruch/src/exercisecompare.cpp new file mode 100644 index 00000000..c0d6466d --- /dev/null +++ b/kbruch/src/exercisecompare.cpp @@ -0,0 +1,327 @@ +/*************************************************************************** + exercisecompare.cpp + ------------------- + begin : 2004/06/03 + 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 "exercisecompare.h" +#include "exercisecompare.moc" + +/* these includes are needed for KDE support */ +#include <kapplication.h> +#include <klocale.h> + +/* these includes are needed for Qt support */ +#include <qlabel.h> +#include <qlayout.h> +#include <qpushbutton.h> +#include <qtooltip.h> +#include <qwhatsthis.h> + +/* standard C++ library includes */ +#include <stdlib.h> + +/* ----- public member functions ----- */ + +/* constructor */ +ExerciseCompare::ExerciseCompare(QWidget * parent, const char * name): + ExerciseBase(parent, name) +{ +#ifdef DEBUG + kdDebug() << "constructor ExerciseCompare()" << endl; +#endif + + /* create a new task */ + QApplication::setOverrideCursor(waitCursor); /* show the sand clock */ + createTask(); + QApplication::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 QWidget(this, "baseWidget"); + baseGrid = new QGridLayout(this, 1, 1, 0, -1, "baseGrid"); + baseGrid->addWidget(baseWidget, 0, 0); + + // this is a VBox + realLayout = new QVBoxLayout(baseWidget, 5, 5, "realLayout"); + + // add a spacer at the top of the VBox + QSpacerItem * v_spacer = new QSpacerItem(1, 1); + realLayout->addItem(v_spacer); + + // now a line holding the task, input fields and result + QHBoxLayout * taskLineHBoxLayout = new QHBoxLayout(5, "taskLineHBoxLayout"); + realLayout->addLayout(taskLineHBoxLayout); + + // spacer + v_spacer = new QSpacerItem(1, 1); + taskLineHBoxLayout->addItem(v_spacer); + + // first the first ratio widget + m_firstRatioWidget = new RatioWidget(baseWidget, "m_firstRatioWidget", m_firstRatio); + taskLineHBoxLayout->addWidget(m_firstRatioWidget); + + // spacer + v_spacer = new QSpacerItem(1, 1); + taskLineHBoxLayout->addItem(v_spacer); + + // now the button where the user has to choose the comparison sign + m_signButton = new QPushButton(baseWidget, "m_signButton"); + + // RTL BUG, see slotSignButtonClicked() for more information + m_signButton->setText( QApplication::reverseLayout()?">":"<"); + + m_signButtonState = lessThen; + taskLineHBoxLayout->addWidget(m_signButton); + QObject::connect(m_signButton, SIGNAL(clicked()), this, SLOT(slotSignButtonClicked())); + QToolTip::add(m_signButton, i18n("Click on this button to change the comparison sign.")); + + // spacer + v_spacer = new QSpacerItem(1, 1); + taskLineHBoxLayout->addItem(v_spacer); + + // now the second ratio widget + m_secondRatioWidget = new RatioWidget(baseWidget, "m_secondRatioWidget", m_secondRatio); + taskLineHBoxLayout->addWidget(m_secondRatioWidget); + + // spacer + v_spacer = new QSpacerItem(1, 1); + taskLineHBoxLayout->addItem(v_spacer); + + // at the right end we have a label just showing CORRECT or WRONG + result_label = new QLabel(baseWidget, "result_label"); + result_label->setText(i18n("WRONG")); + taskLineHBoxLayout->addWidget(result_label); + result_label->hide(); + + // --- that is the end of the horizontal line --- + + // add another spacer in the middle of the VBox + v_spacer = new QSpacerItem(1, 1); + realLayout->addItem(v_spacer); + + // the lower part of the VBox holds just a right aligned button + QHBoxLayout * lowerHBox = new QHBoxLayout(1, "lowerHBox"); + realLayout->addLayout(lowerHBox); + lowerHBox->addStretch(100); + + // the right aligned button + m_checkButton = new QPushButton( baseWidget, "m_checkButton" ); + m_checkButton->setText(i18n("&Check Task")); + m_checkButton->setDefault(true); // is the default button of the dialog + QToolTip::add(m_checkButton, i18n("Click on this button to check your result.")); + lowerHBox->addWidget(m_checkButton, 1, Qt::AlignRight); + QObject::connect(m_checkButton, SIGNAL(clicked()), this, SLOT(slotCheckButtonClicked())); + + // that the user can start typing without moving the focus + m_signButton->setFocus(); + + // show the whole layout + baseWidget->show(); + + // add tooltip and qwhatsthis help to the widget + QToolTip::add(this, i18n("In this exercise you have to compare 2 given fractions.")); + QWhatsThis::add(this, i18n("In this exercise you have to compare 2 given fractions by choosing the correct comparison sign. You can change the comparison sign by just clicking on the button showing the sign.")); +} + +/* destructor */ +ExerciseCompare::~ExerciseCompare() +{ +#ifdef DEBUG + kdDebug() << "destructor ExerciseCompare()" << 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 ExerciseCompare::forceNewTask() +{ +#ifdef DEBUG + kdDebug() << "forceNewTask ExerciseCompare()" << 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 ExerciseCompare::update() +{ + // call update of components + m_firstRatioWidget->updateAndRepaint(); + m_secondRatioWidget->updateAndRepaint(); + + // update for itself + ((QWidget *) this)->update(); +} + + +/* ------ private member functions ------ */ + +void ExerciseCompare::createTask() +{ + // generate the first ratio + m_firstRatio = ratio(int((double(rand()) / RAND_MAX) * 10 + 1), int((double(rand()) / RAND_MAX) * 10 + 1)); + + // now the second ratio, but make sure, the second ratio is different from + // the first one + do + { + m_secondRatio = ratio(int((double(rand()) / RAND_MAX) * 10 + 1), int((double(rand()) / RAND_MAX) * 10 + 1)); + } while (m_firstRatio == m_secondRatio); + + return; +} + +/** - checks, if the user solved the task correctly + - emits signals if task was solved correctly or wrong */ +void ExerciseCompare::showResult() +{ + QPalette pal; + QColorGroup cg; + bool result = m_firstRatio < m_secondRatio; + + // change the tooltip of the check button + QToolTip::add(m_checkButton, i18n("Click on this button to get to the next task.")); + + // disable sign button + m_signButton->setEnabled(false); + + if ((m_signButtonState == lessThen && result == true) || + (m_signButtonState == greaterThen && result == false)) + { + // 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(QColorGroup::Foreground, QColor(6, 179, 0)); + pal.setActive(cg); + cg = pal.inactive(); + cg.setColor(QColorGroup::Foreground, QColor(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(QColorGroup::Foreground, QColor(red)); + pal.setActive(cg); + cg = pal.inactive(); + cg.setColor(QColorGroup::Foreground, QColor(red)); + pal.setInactive(cg); + result_label->setPalette(pal); + + result_label->show(); /* show the result at the end of the task */ + } /* if (entered_result == result) */ + + return; +} + +/** generate the next task and show it to the user */ +void ExerciseCompare::nextTask() +{ + // change the tooltip of the check button + QToolTip::add(m_checkButton, i18n("Click on this button to check your result.")); + + // enable sign button + m_signButton->setEnabled(true); + + result_label->hide(); /* do not show the result at the end of the task */ + + // reset the signButton + // RTL BUG, see slotSignButtonClicked() for more information + m_signButton->setText( QApplication::reverseLayout()?">":"<"); + m_signButtonState = lessThen; + + /* create a new task */ + QApplication::setOverrideCursor(waitCursor); /* show the sand clock */ + createTask(); + QApplication::restoreOverrideCursor(); /* show the normal cursor */ + + // set the ratio widgets with the new ratios + m_firstRatioWidget->setRatio(m_firstRatio); + m_secondRatioWidget->setRatio(m_secondRatio); + + return; +} + +/* ------ private slots ------ */ + +void ExerciseCompare::slotCheckButtonClicked() +{ + if (m_currentState == _CHECK_TASK) + { + 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; +} + +void ExerciseCompare::slotSignButtonClicked() +{ + // in RTL desktops, we still need to allign the + // execise to the left. On Qt4, you can set the direction + // of the layout to LTR (instead of inherit), but on Qt3 + // the only way of fixing it is inserting the widgets in reversed + // order to the layout. + // + // But... as an ugly hack, we can also display the "other" operation + // thats damm ugly, but will work as well :) + // + // See also taskview.cpp for the same bug. + // + // (if you need help with this feel free to contact + // (me - Diego <elcuco@kde.org> ) + // This shuold fix parts of bug #116831, + + if (m_signButtonState == lessThen) + { + m_signButton->setText( QApplication::reverseLayout()?"<":">"); + m_signButtonState = greaterThen; + } else { + m_signButton->setText( QApplication::reverseLayout()?">":"<"); + m_signButtonState = lessThen; + } + + return; +} |