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tdeedu/kbruch/src/exercisecompare.cpp

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/***************************************************************************
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 <tdeapplication.h>
#include <tdelocale.h>
/* these includes are needed for TQt support */
#include <tqlabel.h>
#include <tqlayout.h>
#include <tqpushbutton.h>
#include <tqtooltip.h>
#include <tqwhatsthis.h>
/* standard C++ library includes */
#include <stdlib.h>
/* ----- public member functions ----- */
/* constructor */
ExerciseCompare::ExerciseCompare(TQWidget * parent, const char * name):
ExerciseBase(parent, name)
{
#ifdef DEBUG
kdDebug() << "constructor ExerciseCompare()" << 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);
// spacer
v_spacer = new TQSpacerItem(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 TQSpacerItem(1, 1);
taskLineHBoxLayout->addItem(v_spacer);
// now the button where the user has to choose the comparison sign
m_signButton = new TQPushButton(baseWidget, "m_signButton");
// RTL BUG, see slotSignButtonClicked() for more information
m_signButton->setText( TQApplication::reverseLayout()?">":"<");
m_signButtonState = lessThen;
taskLineHBoxLayout->addWidget(m_signButton);
TQObject::connect(m_signButton, TQ_SIGNAL(clicked()), this, TQ_SLOT(slotSignButtonClicked()));
TQToolTip::add(m_signButton, i18n("Click on this button to change the comparison sign."));
// spacer
v_spacer = new TQSpacerItem(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 TQSpacerItem(1, 1);
taskLineHBoxLayout->addItem(v_spacer);
// at the right end we have a label just showing CORRECT or WRONG
result_label = new TQLabel(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 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."));
lowerHBox->addWidget(m_checkButton, 1, TQt::AlignRight);
TQObject::connect(m_checkButton, TQ_SIGNAL(clicked()), this, TQ_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
TQToolTip::add(this, i18n("In this exercise you have to compare 2 given fractions."));
TQWhatsThis::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, TQt 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
((TQWidget *) 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()
{
TQPalette pal;
TQColorGroup cg;
bool result = m_firstRatio < m_secondRatio;
// change the tooltip of the check button
TQToolTip::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(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 (entered_result == result) */
return;
}
/** generate the next task and show it to the user */
void ExerciseCompare::nextTask()
{
// change the tooltip of the check button
TQToolTip::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( TQApplication::reverseLayout()?">":"<");
m_signButtonState = lessThen;
/* create a new task */
TQApplication::setOverrideCursor(waitCursor); /* show the sand clock */
createTask();
TQApplication::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 TQt4, you can set the direction
// of the layout to LTR (instead of inherit), but on TQt3
// 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( TQApplication::reverseLayout()?"<":">");
m_signButtonState = greaterThen;
} else {
m_signButton->setText( TQApplication::reverseLayout()?">":"<");
m_signButtonState = lessThen;
}
return;
}