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468 lines
15 KiB
468 lines
15 KiB
/***************************************************************************
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exerciseconvert.h
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-------------------
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begin : 2004/06/04
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copyright : (C) 2004 by Sebastian Stein
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email : seb.kde@hpfsc.de
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include "exerciseconvert.h"
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#include "exerciseconvert.moc"
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/* these includes are needed for KDE support */
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#include <tdeapplication.h>
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#include <tdelocale.h>
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#include <tdemessagebox.h>
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#include <knumvalidator.h>
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/* these includes are needed for TQt support */
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#include <tqlabel.h>
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#include <tqlayout.h>
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#include <tqlineedit.h>
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#include <tqpushbutton.h>
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#include <tqtooltip.h>
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#include <tqwhatsthis.h>
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/* standard C++ library includes */
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#include <stdlib.h>
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#include "rationalwidget.h"
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#include "resultwidget.h"
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/* ----- public member functions ----- */
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/* constructor */
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ExerciseConvert::ExerciseConvert(TQWidget * parent, const char * name):
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ExerciseBase(parent, name)
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{
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#ifdef DEBUG
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kdDebug() << "constructor ExerciseConvert()" << endl;
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#endif
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/* create a new task */
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TQApplication::setOverrideCursor(waitCursor); /* show the sand clock */
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createTask();
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TQApplication::restoreOverrideCursor(); /* show the normal cursor */
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// the next thing to do on a button click would be to check the entered
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// result
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m_currentState = _CHECK_TASK;
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baseWidget = new TQWidget(this, "baseWidget");
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baseGrid = new TQGridLayout(this, 1, 1, 0, -1, "baseGrid");
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baseGrid->addWidget(baseWidget, 0, 0);
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// this is a VBox
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realLayout = new TQVBoxLayout(baseWidget, 5, 5, "realLayout");
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// add a spacer at the top of the VBox
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TQSpacerItem * v_spacer = new TQSpacerItem(1, 1);
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realLayout->addItem(v_spacer);
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// now a line holding the task, input fields and result
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TQHBoxLayout * taskLineHBoxLayout = new TQHBoxLayout(5, "taskLineHBoxLayout");
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realLayout->addLayout(taskLineHBoxLayout);
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// first left is the rational widget
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m_rationalWidget = new RationalWidget(baseWidget, "m_rationalWidget", m_number, m_periodStart, m_periodLength);
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// taskLineHBoxLayout->addWidget(m_rationalWidget);
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// now we have the input fields aligned in a VBox
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TQVBoxLayout * inputLayout = new TQVBoxLayout(5, "inputLayout");
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// taskLineHBoxLayout->addLayout(inputLayout);
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// to validate, that the input is an int
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KIntValidator *valnum = new KIntValidator( this );
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/* add input box so the user can enter numerator */
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numer_edit = new TQLineEdit(baseWidget, "numer_edit");
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numer_edit->setValidator( valnum ); // use the int validator
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TQToolTip::add(numer_edit, i18n("Enter the numerator of your result"));
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inputLayout->addWidget(numer_edit);
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/* add a line between the edit boxes */
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edit_line = new TQFrame(baseWidget, "edit_line");
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edit_line->setGeometry(TQRect(100, 100, 20, 20));
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edit_line->setFrameStyle(TQFrame::HLine | TQFrame::Sunken);
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inputLayout->addWidget(edit_line);
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/* add input box so the user can enter denominator */
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deno_edit = new TQLineEdit(baseWidget, "deno_edit");
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deno_edit->setValidator( valnum ); // use the int validator
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TQToolTip::add(deno_edit, i18n("Enter the denominator of your result"));
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inputLayout->addWidget(deno_edit);
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// next is the result widget
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m_resultWidget = new ResultWidget(baseWidget, "m_resultWidget", m_result);
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// taskLineHBoxLayout->addWidget(m_resultWidget);
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m_resultWidget->hide();
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// at the right end we have a label just showing CORRECT or WRONG
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result_label = new TQLabel(baseWidget, "result_lable");
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result_label->setText(i18n("WRONG"));
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// taskLineHBoxLayout->addWidget(result_label);
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result_label->hide();
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// add another spacer in the middle of the VBox
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v_spacer = new TQSpacerItem(1, 1, TQSizePolicy::Expanding, TQSizePolicy::Minimum);
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// taskLineHBoxLayout->addItem(v_spacer);
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// --- that is the end of the horizontal line ---
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// in RTL desktops, we still need to allign the
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// execise to the left. On TQt4, you can set the direction
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// of the layout to LTR (instead of inherit), but on TQt3
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// the only way of fixing it is inserting the widgets in reversed
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// order to the layout.
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//
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// if you need help with this feel free to contact me - Diego <elcuco@kde.org> )
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// This should fix parts of bug #116831
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if (TQApplication::reverseLayout())
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{
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taskLineHBoxLayout->addItem(v_spacer);
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taskLineHBoxLayout->addWidget(result_label);
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taskLineHBoxLayout->addWidget(m_resultWidget);
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taskLineHBoxLayout->addLayout(inputLayout);
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taskLineHBoxLayout->addWidget(m_rationalWidget);
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}
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else
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{
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taskLineHBoxLayout->addWidget(m_rationalWidget);
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taskLineHBoxLayout->addLayout(inputLayout);
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taskLineHBoxLayout->addWidget(m_resultWidget);
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taskLineHBoxLayout->addWidget(result_label);
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taskLineHBoxLayout->addItem(v_spacer);
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}
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// add another spacer in the middle of the VBox
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v_spacer = new TQSpacerItem(1, 1);
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realLayout->addItem(v_spacer);
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// the lower part of the VBox holds just a right aligned button
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TQHBoxLayout * lowerHBox = new TQHBoxLayout(1, "lowerHBox");
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realLayout->addLayout(lowerHBox);
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lowerHBox->addStretch(100);
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// the right aligned button
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m_checkButton = new TQPushButton( baseWidget, "m_checkButton" );
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m_checkButton->setText(i18n("&Check Task"));
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m_checkButton->setDefault(true); // is the default button of the dialog
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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."));
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lowerHBox->addWidget(m_checkButton, 1, TQt::AlignRight);
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TQObject::connect(m_checkButton, TQT_SIGNAL(clicked()), this, TQT_SLOT(slotCheckButtonClicked()));
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// that the user can start typing without moving the focus
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numer_edit->setFocus();
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// show the whole layout
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baseWidget->show();
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// add tooltip and qwhatsthis help to the widget
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TQToolTip::add(this, i18n("In this exercise you have to convert a number into a fraction."));
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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!"));
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}
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/* destructor */
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ExerciseConvert::~ExerciseConvert()
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{
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#ifdef DEBUG
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kdDebug() << "destructor ExerciseConvert()" << endl;
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#endif
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/* no need to delete any child widgets, TQt does it by itself */
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}
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/** resets the current state, creates a new task and count the last task as
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* wrong, if it wasn't solved (in _NEXT_TASK state) yet
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* mainly used after changing the task parameters */
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void ExerciseConvert::forceNewTask()
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{
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#ifdef DEBUG
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kdDebug() << "forceNewTask ExerciseConvert()" << endl;
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#endif
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if (m_currentState == _CHECK_TASK)
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{
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// emit the signal for wrong
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signalExerciseSolvedWrong();
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}
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m_currentState = _CHECK_TASK;
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m_checkButton->setText(i18n("&Check Task"));
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// generate next task
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(void) nextTask();
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}
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/* ------ public slots ------ */
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void ExerciseConvert::update()
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{
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// call update of components
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m_rationalWidget->updateAndRepaint();
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m_resultWidget->updateAndRepaint();
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// update for itself
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((TQWidget *) this)->update();
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}
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/* ------ private member functions ------ */
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void ExerciseConvert::createTask()
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{
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// the tasks are hardcoded here; there are some algorithms to convert
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// rational numbers to fractions, but it is not worth the effort here
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switch(int((double(rand()) / RAND_MAX) * 18 + 1))
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{
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case 0 : m_number = TDEGlobal::locale()->formatNumber(0.5, 1);
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m_periodStart = 2;
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m_periodLength = 0;
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m_result = ratio(1, 2);
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break;
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case 1 : m_number = TDEGlobal::locale()->formatNumber(0.3, 1);
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m_periodStart = 2;
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m_periodLength = 1;
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m_result = ratio(1, 3);
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break;
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case 2 : m_number = TDEGlobal::locale()->formatNumber(0.6, 1);
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m_periodStart = 2;
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m_periodLength = 1;
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m_result = ratio(2, 3);
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break;
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case 3 : m_number = TDEGlobal::locale()->formatNumber(0.25, 2);
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m_periodStart = 2;
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m_periodLength = 0;
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m_result = ratio(1, 4);
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break;
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case 4 : m_number = TDEGlobal::locale()->formatNumber(0.75, 2);
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m_periodStart = 2;
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m_periodLength = 0;
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m_result = ratio(3, 4);
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break;
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case 5 : m_number = TDEGlobal::locale()->formatNumber(0.2, 1);
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m_periodStart = 2;
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m_periodLength = 0;
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m_result = ratio(1, 5);
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break;
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case 6 : m_number = TDEGlobal::locale()->formatNumber(0.4, 1);
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m_periodStart = 2;
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m_periodLength = 0;
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m_result = ratio(2, 5);
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break;
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case 7 : m_number = TDEGlobal::locale()->formatNumber(0.6, 1);
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m_periodStart = 2;
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m_periodLength = 0;
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m_result = ratio(3, 5);
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break;
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case 8 : m_number = TDEGlobal::locale()->formatNumber(0.8, 1);
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m_periodStart = 2;
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m_periodLength = 0;
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m_result = ratio(4, 5);
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break;
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case 9 : m_number = TDEGlobal::locale()->formatNumber(0.16, 2);
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m_periodStart = 3;
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m_periodLength = 1;
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m_result = ratio(1, 6);
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break;
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case 10 : m_number = TDEGlobal::locale()->formatNumber(0.142857, 6);
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m_periodStart = 2;
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m_periodLength = 6;
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m_result = ratio(1, 7);
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break;
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case 11 : m_number = TDEGlobal::locale()->formatNumber(0.125, 3);
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m_periodStart = 2;
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m_periodLength = 0;
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m_result = ratio(1, 8);
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break;
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case 12 : m_number = TDEGlobal::locale()->formatNumber(0.375, 3);
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m_periodStart = 2;
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m_periodLength = 0;
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m_result = ratio(3, 8);
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break;
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case 13 : m_number = TDEGlobal::locale()->formatNumber(0.1, 1);
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m_periodStart = 2;
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m_periodLength = 1;
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m_result = ratio(1, 9);
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break;
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case 14 : m_number = TDEGlobal::locale()->formatNumber(0.1, 1);
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m_periodStart = 2;
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m_periodLength = 0;
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m_result = ratio(1, 10);
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break;
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case 15 : m_number = TDEGlobal::locale()->formatNumber(0.05, 2);
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m_periodStart = 2;
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m_periodLength = 0;
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m_result = ratio(1, 20);
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break;
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case 16 : m_number = TDEGlobal::locale()->formatNumber(0.01, 2);
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m_periodStart = 2;
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m_periodLength = 0;
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m_result = ratio(1, 100);
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break;
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case 17 : m_number = TDEGlobal::locale()->formatNumber(0.83, 2);
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m_periodStart = 3;
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m_periodLength = 1;
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m_result = ratio(5, 6);
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break;
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default :
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case 18 : m_number = TDEGlobal::locale()->formatNumber(0.001, 3);
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m_periodStart = 2;
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m_periodLength = 0;
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m_result = ratio(1, 1000);
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break;
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}
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return;
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}
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/** - checks, if the user solved the task correctly
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- emits signals if task was solved correctly or wrong */
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void ExerciseConvert::showResult()
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{
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TQString tmp_str; /* to build a string for a label */
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TQPalette pal;
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TQColorGroup cg;
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ratio entered_result;
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// change the tooltip of the check button
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TQToolTip::add(m_checkButton, i18n("Click on this button to get to the next task."));
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numer_edit->setEnabled(false);
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deno_edit->setEnabled(false);
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m_resultWidget->setResult(m_result);
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m_resultWidget->show();
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// an empty numerator field will be interpreted as 0
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if (numer_edit->text().isEmpty() == true)
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numer_edit->setText("0");
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// an empty denominator field will be interpreted as 1
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if (deno_edit->text().isEmpty() == true)
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deno_edit->setText("1");
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/* store the entered result to check it, but without reducing */
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entered_result.setNumerator(numer_edit->text().toInt(), false);
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entered_result.setDenominator(deno_edit->text().toInt(), false);
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// check the entered result; 0/1 == 0/5 -> true,
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// but 0/1 == 0/0 -> false
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// a 0 for denominator is never allowed (always counted as wrong)
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//
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// we have to get the 0 directly from the input field, because
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// Ratio::setDenominator(0, false) will set the denominator to 1 to ensure
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// the Ratio is valid
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if ( (deno_edit->text().toInt() != 0) && ((entered_result == m_result) ||
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(m_result.numerator() == 0 && entered_result.numerator() == 0)) )
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{
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// emit the signal for correct
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signalExerciseSolvedCorrect();
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/* yes, the user entered the correct result */
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result_label->setText(i18n("CORRECT"));
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pal = result_label->palette(); /* set green font color */
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cg = pal.active();
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cg.setColor(TQColorGroup::Foreground, TQColor(6, 179, 0));
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pal.setActive(cg);
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cg = pal.inactive();
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cg.setColor(TQColorGroup::Foreground, TQColor(6, 179, 0));
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pal.setInactive(cg);
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result_label->setPalette(pal);
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result_label->show(); /* show the result at the end of the task */
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} else {
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// emit the signal for wrong
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signalExerciseSolvedWrong();
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/* no, the user entered the wrong result */
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result_label->setText(i18n("WRONG"));
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pal = result_label->palette(); /* set red font color */
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cg = pal.active();
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cg.setColor(TQColorGroup::Foreground, TQColor(red));
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pal.setActive(cg);
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cg = pal.inactive();
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cg.setColor(TQColorGroup::Foreground, TQColor(red));
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pal.setInactive(cg);
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result_label->setPalette(pal);
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result_label->show(); /* show the result at the end of the task */
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// if the user entered a 0 for the denominator (division by 0) we have to
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// get the 0 directly from the input field, because
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// Ratio::setDenominator(0, true) will set the denominator to 1 to ensure
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// the Ratio is valid
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if (deno_edit->text().toInt() == 0)
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{
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KMessageBox::information(this,
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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."));
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} else {
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/* maybe the entered ratio was not reduced */
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entered_result.reduce();
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if (entered_result == m_result)
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KMessageBox::information(this,
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i18n("You entered the correct result, but not reduced.\nAlways enter your results as reduced. This task will be counted as not correctly solved."));
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}
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} /* if (entered_result == result) */
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return;
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}
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/** generate the next task and show it to the user */
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void ExerciseConvert::nextTask()
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{
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// change the tooltip of the check button
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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."));
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numer_edit->setEnabled(true);
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deno_edit->setEnabled(true);
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result_label->hide(); /* do not show the result at the end of the task */
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m_resultWidget->hide();
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/* clear user input */
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deno_edit->setText("");
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numer_edit->setText("");
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numer_edit->setFocus();
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/* create a new task */
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TQApplication::setOverrideCursor(waitCursor); /* show the sand clock */
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createTask();
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TQApplication::restoreOverrideCursor(); /* show the normal cursor */
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// update the task widget
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m_rationalWidget->setRational(m_number, m_periodStart, m_periodLength);
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return;
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}
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/* ------ private slots ------ */
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void ExerciseConvert::slotCheckButtonClicked()
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{
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if (m_currentState == _CHECK_TASK)
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{
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// if nothing has been entered by the user, we don't check the result yet
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if (numer_edit->text().isEmpty() == true && deno_edit->text().isEmpty() ==
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true)
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return;
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m_currentState = _NEXT_TASK;
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m_checkButton->setText(i18n("N&ext Task"));
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(void) showResult();
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} else {
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m_currentState = _CHECK_TASK;
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m_checkButton->setText(i18n("&Check Task"));
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(void) nextTask();
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}
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return;
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}
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