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+/***************************************************************************
+ taskview.cpp - The task window
+ -------------------
+ begin : Tue Feb 08 13:41:00 CET 2002
+ copyright : (C) 2001 - 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 "taskview.h"
+#include "taskview.moc"
+
+/* these includes are needed for KDE support */
+#include <klocale.h>
+#include <kmessagebox.h>
+#include <kapplication.h>
+#include <knumvalidator.h>
+
+/* these includes are needed for Qt support */
+#include <qlabel.h>
+#include <qlayout.h>
+#include <qlineedit.h>
+#include <qpushbutton.h>
+#include <qtooltip.h>
+#include <qwhatsthis.h>
+
+/* standard C++ library includes */
+#include <math.h>
+
+/* ----- public member functions ----- */
+
+/* constructor */
+TaskView::TaskView(QWidget * parent, const char * name, bool padd_sub,
+ bool pmul_div, unsigned int pnr_ratios, unsigned int pmax_md):
+ ExerciseBase(parent, name), add_sub(padd_sub), mul_div(pmul_div),
+ nr_ratios(pnr_ratios), max_md(pmax_md)
+{
+#ifdef DEBUG
+ kdDebug() << "constructor TaskView()" << endl;
+#endif
+
+ curr_nr_ratios = nr_ratios;
+
+ /* create a new task */
+ QApplication::setOverrideCursor(waitCursor); /* show the sand clock */
+ current_task.create_task(max_md, nr_ratios, add_sub, mul_div);
+ 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);
+
+ // first left is the task widget
+ m_taskWidget = new TaskWidget(baseWidget, "m_taskWidget", current_task);
+
+ // now we have the input fields aligned in a VBox
+ QVBoxLayout * inputLayout = new QVBoxLayout(5, "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 QLineEdit(baseWidget, "numer_edit");
+ numer_edit->setValidator( valnum ); // use the int validator
+ QToolTip::add(numer_edit, i18n("Enter the numerator of your result"));
+ inputLayout->addWidget(numer_edit);
+
+ /* add a line between the edit boxes */
+ edit_line = new QFrame(baseWidget, "edit_line");
+ edit_line->setGeometry(QRect(100, 100, 20, 20));
+ edit_line->setFrameStyle(QFrame::HLine | QFrame::Sunken);
+ inputLayout->addWidget(edit_line);
+
+ /* add input box so the user can enter denominator */
+ deno_edit = new QLineEdit(baseWidget, "deno_edit");
+ deno_edit->setValidator( valnum ); // use the int validator
+ QToolTip::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", *new ratio());
+
+ // 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"));
+ result_label->hide();
+
+ // add another spacer in the middle of the VBox
+ v_spacer = new QSpacerItem(1, 1, QSizePolicy::Expanding, QSizePolicy::Minimum);
+
+ // --- 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 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.
+ //
+ // if you need help with this feel free to contact me - Diego <elcuco@kde.org> )
+ // This should fix parts of bug #116831
+ if (QApplication::reverseLayout())
+ {
+ taskLineHBoxLayout->addItem(v_spacer);
+ taskLineHBoxLayout->addWidget(result_label);
+ taskLineHBoxLayout->addWidget(m_resultWidget);
+ taskLineHBoxLayout->addLayout(inputLayout);
+ taskLineHBoxLayout->addWidget(m_taskWidget);
+ }
+ else
+ {
+ taskLineHBoxLayout->addWidget(m_taskWidget);
+ 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 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. The button will not work if you have not entered a result yet."));
+ 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
+ numer_edit->setFocus();
+
+ // show the whole layout
+ baseWidget->show();
+
+ // show the whole layout
+ m_taskWidget->show();
+ m_resultWidget->hide();
+
+ // add tooltip and qwhatsthis help to the widget
+ QToolTip::add(this, i18n("In this exercise you have to solve a given task with fractions."));
+ QWhatsThis::add(this, i18n("In this exercise you have to solve the generated task. You have to enter numerator and denominator. You can adjust the difficulty of the task with the boxes in the toolbar. Do not forget to reduce the result!"));
+}
+
+/* destructor */
+TaskView::~TaskView()
+{
+#ifdef DEBUG
+ kdDebug() << "destructor TaskView()" << endl;
+#endif
+
+ /* no need to delete any child widgets, Qt does it by itself */
+}
+
+/** the parameters of task generation can be set with this function */
+void TaskView::setTaskParameters(bool padd_sub, bool pmul_div, unsigned int pnr_ratios, unsigned int pmax_md)
+{
+ // at least one operation must be enabled
+ if ((padd_sub == false) && (pmul_div == false))
+ padd_sub = true;
+
+ // we need at least 2 ratios
+ if (pnr_ratios < 2)
+ pnr_ratios = 2;
+
+ // we can only visualize 5 ratios, so we have to limit it
+ if (pnr_ratios > 5)
+ pnr_ratios = 5;
+
+ // the main denominator must be at least 2^pnr_ratios
+ if (pow(2, pnr_ratios) > pmax_md)
+ pmax_md = (unsigned int) pow(2, pnr_ratios);
+
+ // so everything seems to be fine, lets set the internal values to the given
+ // ones
+ add_sub = padd_sub;
+ mul_div = pmul_div;
+ max_md = pmax_md;
+
+ nr_ratios = pnr_ratios;
+
+ return;
+}
+
+/** 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 TaskView::forceNewTask()
+{
+#ifdef DEBUG
+ kdDebug() << "forceNewTask TaskView()" << endl;
+#endif
+
+ if (m_currentState == _CHECK_TASK)
+ {
+ // emit the signal for wrong
+ signalTaskSolvedWrong();
+ }
+ m_currentState = _CHECK_TASK;
+ m_checkButton->setText(i18n("&Check Task"));
+
+ // generate next task
+ (void) nextTask();
+}
+
+
+/* ------ public slots ------ */
+
+void TaskView::update()
+{
+ // call update of components
+ m_taskWidget->updateAndRepaint();
+ m_resultWidget->updateAndRepaint();
+
+ // update for itself
+ ((QWidget *) this)->update();
+}
+
+
+/* ------ private member functions ------ */
+
+/** - checks the entered result and compares it to the task's result
+ - shows the correct result and informs the user if he was right or wrong
+ - if the user entered the result unreduced, he will be informed about it
+ - if the user entered a 0 for the denominator, he will be informed about
+ it (division by zero)
+ - emits signals if task was solved right or wrong */
+void TaskView::showResult()
+{
+ QString tmp_str; /* to build a string for a label */
+ QPalette pal;
+ QColorGroup cg;
+
+ // change the tooltip of the check button
+ QToolTip::add(m_checkButton, i18n("Click on this button to get to the next task."));
+
+ numer_edit->setEnabled(false);
+ deno_edit->setEnabled(false);
+
+ result = current_task.solve();
+ m_resultWidget->setResult(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 == result) ||
+ (result.numerator() == 0 && entered_result.numerator() == 0)) )
+ {
+ // emit the signal for correct
+ signalTaskSolvedCorrect();
+
+ /* 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
+ signalTaskSolvedWrong();
+
+ /* 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 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 == 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) */
+}
+
+/** generate the next task and show it to the user */
+void TaskView::nextTask()
+{
+ // change the tooltip of the check button
+ QToolTip::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 */
+ QApplication::setOverrideCursor(waitCursor); /* show the sand clock */
+ current_task.create_task(max_md, nr_ratios, add_sub, mul_div);
+ QApplication::restoreOverrideCursor(); /* show the normal cursor */
+
+ // update the task widget
+ m_taskWidget->setTask((const task) (current_task));
+}
+
+/* ------ private slots ------ */
+
+void TaskView::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();
+ }
+}
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