summaryrefslogtreecommitdiffstats
path: root/kbruch/src/exercisecompare.cpp
blob: f6652e5687faf2a79e5a568748aa84f237082fe6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
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 <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, TQT_SIGNAL(clicked()), this, TQT_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, Qt::AlignRight);
	TQObject::connect(m_checkButton, TQT_SIGNAL(clicked()), this, TQT_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, 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
	((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 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( TQApplication::reverseLayout()?"<":">");
		m_signButtonState = greaterThen;
	} else {
		m_signButton->setText( TQApplication::reverseLayout()?">":"<");
		m_signButtonState = lessThen;
	}

	return;
}