kscreensaver/kdesavers/banner.cpp

   1 //-----------------------------------------------------------------------------
   2 //
   3 // kbanner - Basic screen saver for KDE
   4 //
   5 // Copyright (c)  Martin R. Jones 1996
   6 //
   7 // layout management added 1998/04/19 by Mario Weilguni <mweilguni@kde.org>
   8 // clock function and color cycling added 2000/01/09 by Alexander Neundorf <alexander.neundorf@rz.tu-ilmenau.de>
   9 // 2001/03/04 Converted to use libkscreensaver by Martin R. Jones
  10 // 2002/04/07 Added random vertical position of text,
  11 //              changed horizontal step size to reduce jerkyness,
  12 //              text will return to right margin immediately (and not be drawn half a screen width off-screen)
  13 //              Harald H.-J. Bongartz <harald@bongartz.org>
  14 // 2003/09/06 Converted to use KDialogBase - Nadeem Hasan <nhasan@kde.org>
  15 #include <stdlib.h>
  16
  17 #include <qlabel.h>
  18 #include <qlineedit.h>
  19 #include <qcombobox.h>
  20 #include <qcheckbox.h>
  21 #include <q3groupbox.h>
  22 #include <qslider.h>
  23 #include <qlayout.h>
  24 #include <qdatetime.h>
  25 #include <qfontdatabase.h>
  26 #include <qpainter.h>
  27 //Added by qt3to4:
  28 #include <QPixmap>
  29 #include <QGridLayout>
  30 #include <QHBoxLayout>
  31 #include <QVBoxLayout>
  32
  33 #include <kapplication.h>
  34 #include <krandomsequence.h>
  35 #include <kglobal.h>
  36 #include <klocale.h>
  37 #include <kconfig.h>
  38 #include <kmessagebox.h>
  39 #include <kcolorbutton.h>
  40 #include <kfontcombo.h>
  41
  42 #include "banner.h"
  43 #include "banner.moc"
  44 #include <QDesktopWidget>
  45 // libkscreensaver interface
  46 extern "C"
  47 {
  48     KDE_EXPORT const char *kss_applicationName = "kbanner.kss";
  49     KDE_EXPORT const char *kss_description = I18N_NOOP( "KBanner" );
  50     KDE_EXPORT const char *kss_version = "2.2.0";
  51
  52     KDE_EXPORT KScreenSaver *kss_create( WId id )
  53     {
  54         return new KBannerSaver( id );
  55     }
  56
  57     KDE_EXPORT QDialog *kss_setup()
  58     {
  59         return new KBannerSetup();
  60     }
  61 }
  62
  63 //-----------------------------------------------------------------------------
  64
  65 KBannerSetup::KBannerSetup( QWidget *parent, const char *name )
  66         : KDialogBase( parent, name, true, i18n( "Setup Banner Screen Saver" ),
  67           Ok|Cancel|Help, Ok, true ), saver( 0 ), ed(0), speed( 50 )
  68 {
  69         setButtonText( Help, i18n( "A&bout" ) );
  70         readSettings();
  71
  72     QWidget *main = makeMainWidget();
  73
  74         QLabel *label;
  75
  76         QVBoxLayout *tl = new QVBoxLayout(main, 0, spacingHint());
  77         QHBoxLayout *tl1 = new QHBoxLayout( 0, 0, spacingHint() );
  78         tl->addLayout(tl1);
  79         QVBoxLayout *tl11 = new QVBoxLayout( 0, 0, spacingHint() );
  80         tl1->addLayout(tl11);
  81
  82         Q3GroupBox *group = new Q3GroupBox( 0, Vertical, i18n("Font"), main );
  83         QGridLayout *gl = new QGridLayout(group->layout(), 6, 2, spacingHint() );
  84
  85         label = new QLabel( i18n("Family:"), group );
  86         gl->addWidget(label, 1, 0);
  87
  88         KFontCombo* comboFonts = new KFontCombo( QFontDatabase().families(), group );
  89         comboFonts->setCurrentFont( fontFamily );
  90         gl->addWidget(comboFonts, 1, 1);
  91         connect( comboFonts, SIGNAL( activated( const QString& ) ),
  92                         SLOT( slotFamily( const QString& ) ) );
  93
  94         label = new QLabel( i18n("Size:"), group );
  95         gl->addWidget(label, 2, 0);
  96
  97         comboSizes = new QComboBox( TRUE, group );
  98         fillFontSizes();
  99         gl->addWidget(comboSizes, 2, 1);
 100         connect( comboSizes, SIGNAL( activated( int ) ), SLOT( slotSize( int ) ) );
 101         connect( comboSizes, SIGNAL( textChanged( const QString & ) ),
 102                         SLOT( slotSizeEdit( const QString &  ) ) );
 103
 104         QCheckBox *cb = new QCheckBox( i18n("Bold"),
 105                                        group );
 106         cb->setChecked( bold );
 107         connect( cb, SIGNAL( toggled( bool ) ), SLOT( slotBold( bool ) ) );
 108         gl->addWidget(cb, 3, 0);
 109
 110         cb = new QCheckBox( i18n("Italic"), group );
 111         cb->setChecked( italic );
 112         gl->addWidget(cb, 3, 1);
 113         connect( cb, SIGNAL( toggled( bool ) ), SLOT( slotItalic( bool ) ) );
 114
 115         label = new QLabel( i18n("Color:"), group );
 116         gl->addWidget(label, 4, 0);
 117
 118         colorPush = new KColorButton( fontColor, group );
 119         gl->addWidget(colorPush, 4, 1);
 120         connect( colorPush, SIGNAL( changed(const QColor &) ),
 121                  SLOT( slotColor(const QColor &) ) );
 122
 123    QCheckBox *cyclingColorCb=new QCheckBox(i18n("Cycling color"),group);
 124    cyclingColorCb->setMinimumSize(cyclingColorCb->sizeHint());
 125    gl->addMultiCellWidget(cyclingColorCb,5,5,0,1);
 126    connect(cyclingColorCb,SIGNAL(toggled(bool)),this,SLOT(slotCyclingColor(bool)));
 127    cyclingColorCb->setChecked(cyclingColor);
 128
 129         preview = new QWidget( main );
 130         preview->setFixedSize( 220, 170 );
 131         preview->setBackgroundColor( Qt::black );
 132         preview->show();    // otherwise saver does not get correct size
 133         saver = new KBannerSaver( preview->winId() );
 134         tl1->addWidget(preview);
 135
 136         tl11->addWidget(group);
 137
 138         label = new QLabel( i18n("Speed:"), main );
 139         tl11->addStretch(1);
 140         tl11->addWidget(label);
 141
 142         QSlider *sb = new QSlider(0, 100, 10, speed, QSlider::Horizontal, main );
 143         sb->setMinimumWidth( 180);
 144         sb->setFixedHeight(20);
 145     sb->setTickmarks(QSlider::Below);
 146     sb->setTickInterval(10);
 147         tl11->addWidget(sb);
 148         connect( sb, SIGNAL( valueChanged( int ) ), SLOT( slotSpeed( int ) ) );
 149
 150         QHBoxLayout *tl2 = new QHBoxLayout;
 151         tl->addLayout(tl2);
 152
 153         label = new QLabel( i18n("Message:"), main );
 154         tl2->addWidget(label);
 155
 156         ed = new QLineEdit( main );
 157         tl2->addWidget(ed);
 158         ed->setText( message );
 159         connect( ed, SIGNAL( textChanged( const QString & ) ),
 160                         SLOT( slotMessage( const QString &  ) ) );
 161
 162    QCheckBox *timeCb=new QCheckBox( i18n("Show current time"), main);
 163    timeCb->setFixedSize(timeCb->sizeHint());
 164    tl->addWidget(timeCb,0,Qt::AlignLeft);
 165    connect(timeCb,SIGNAL(toggled(bool)),this,SLOT(slotTimeToggled(bool)));
 166    timeCb->setChecked(showTime);
 167
 168    tl->addStretch();
 169 }
 170
 171 // read settings from config file
 172 void KBannerSetup::readSettings()
 173 {
 174     KConfig *config = KGlobal::config();
 175     config->setGroup( "Settings" );
 176
 177    speed=config->readNumEntry("Speed",50);
 178 /*      if ( speed > 100 )
 179                 speed = 100;
 180         else if ( speed < 50 )
 181                 speed = 50;*/
 182
 183    message=config->readEntry("Message","KDE");
 184    showTime=config->readBoolEntry("ShowTime",FALSE);
 185    fontFamily=config->readEntry("FontFamily",(QApplication::font()).family());
 186    fontSize=config->readNumEntry("FontSize",48);
 187    fontColor.setNamedColor(config->readEntry("FontColor","red"));
 188    cyclingColor=config->readBoolEntry("CyclingColor",FALSE);
 189    bold=config->readBoolEntry("FontBold",FALSE);
 190    italic=config->readBoolEntry("FontItalic",FALSE);
 191 }
 192
 193 void KBannerSetup::fillFontSizes()
 194 {
 195     bool block = comboSizes->signalsBlocked();
 196     comboSizes->blockSignals( true );
 197     comboSizes->clear();
 198     int i = 0;
 199     sizes = QFontDatabase().pointSizes( fontFamily );
 200     sizes << 96 << 128 << 156 << 0;
 201     int current = 0;
 202     while ( sizes[i] )
 203         {
 204         QString num;
 205         num.setNum( sizes[i] );
 206         comboSizes->insertItem( num, i );
 207         if ( fontSize == sizes[i] ) // fontsize equals one of the defined ones
 208             {
 209             current = i;
 210             comboSizes->setCurrentItem( current );
 211             slotSize( current );
 212             }
 213         i++;
 214         }
 215     if ( current == 0 ) // fontsize seems to be entered by hand
 216         {
 217         QString fsize;
 218         fsize.setNum( fontSize );
 219         comboSizes->setEditText(fsize);
 220         slotSizeEdit( fsize );
 221         }
 222     comboSizes->blockSignals( block );
 223 }
 224
 225 void KBannerSetup::slotFamily( const QString& fam )
 226 {
 227         fontFamily = fam;
 228         fillFontSizes(); // different font, different sizes
 229         if ( saver )
 230                 saver->setFont( fontFamily, fontSize, fontColor, bold, italic );
 231 }
 232
 233 void KBannerSetup::slotSize( int indx )
 234 {
 235         fontSize = sizes[indx];
 236         if ( saver )
 237                 saver->setFont( fontFamily, fontSize, fontColor, bold, italic );
 238 }
 239
 240 void KBannerSetup::slotSizeEdit( const QString& fs )
 241 {
 242         bool ok;
 243         fontSize = fs.toInt( &ok, 10 );
 244         if ( ok )
 245                 if ( saver )
 246                         saver->setFont( fontFamily, fontSize, fontColor, bold, italic );
 247 }
 248
 249 void KBannerSetup::slotColor( const QColor &col )
 250 {
 251     fontColor = col;
 252     if ( saver )
 253         saver->setColor(fontColor);
 254 }
 255
 256 void KBannerSetup::slotCyclingColor(bool on)
 257 {
 258    colorPush->setEnabled(!on);
 259    cyclingColor=on;
 260
 261    if ( saver )
 262    {
 263       saver->setCyclingColor( on );
 264       if ( !on )
 265          saver->setColor( fontColor );
 266    }
 267 }
 268
 269 void KBannerSetup::slotBold( bool state )
 270 {
 271         bold = state;
 272         if ( saver )
 273                 saver->setFont( fontFamily, fontSize, fontColor, bold, italic );
 274 }
 275
 276 void KBannerSetup::slotItalic( bool state )
 277 {
 278         italic = state;
 279         if ( saver )
 280                 saver->setFont( fontFamily, fontSize, fontColor, bold, italic );
 281 }
 282
 283 void KBannerSetup::slotSpeed( int num )
 284 {
 285         speed = num;
 286         if ( saver )
 287                 saver->setSpeed( speed );
 288 }
 289
 290 void KBannerSetup::slotMessage( const QString &msg )
 291 {
 292         message = msg;
 293         if ( saver )
 294                 saver->setMessage( message );
 295 }
 296
 297 void KBannerSetup::slotTimeToggled( bool on )
 298 {
 299    ed->setEnabled(!on);
 300    showTime=on;
 301    if (saver)
 302    {
 303       if (showTime)
 304          saver->setTimeDisplay();
 305       else
 306       {
 307          message=ed->text();
 308          saver->setMessage(message);
 309       };
 310    };
 311 }
 312
 313 // Ok pressed - save settings and exit
 314 void KBannerSetup::slotOk()
 315 {
 316         KConfig *config = KGlobal::config();
 317         config->setGroup( "Settings" );
 318
 319         config->writeEntry( "Speed", speed );
 320         config->writeEntry( "Message", message );
 321         config->writeEntry( "ShowTime", showTime );
 322         config->writeEntry( "FontFamily", fontFamily );
 323
 324         QString fsize;
 325         if (fontSize == 0) // an non-number was entered in the font size combo
 326         {
 327                 fontSize = 48;
 328         }
 329         fsize.setNum( fontSize );
 330         config->writeEntry( "FontSize", fsize );
 331
 332         QString colName;
 333         colName.sprintf( "#%02x%02x%02x", fontColor.red(), fontColor.green(),
 334                 fontColor.Qt::blue() );
 335         config->writeEntry( "FontColor", colName );
 336         config->writeEntry( "CyclingColor", cyclingColor );
 337         config->writeEntry( "FontBold", bold );
 338         config->writeEntry( "FontItalic", italic );
 339
 340         config->sync();
 341
 342         accept();
 343 }
 344
 345 void KBannerSetup::slotHelp()
 346 {
 347         KMessageBox::about(this,
 348                              i18n("Banner Version 2.2.1\n\nWritten by Martin R. Jones 1996\nmjones@kde.org\nExtended by Alexander Neundorf 2000\nalexander.neundorf@rz.tu-ilmenau.de\n"));
 349 }
 350
 351 //-----------------------------------------------------------------------------
 352
 353 KBannerSaver::KBannerSaver( WId id ) : KScreenSaver( id )
 354 {
 355         krnd = new KRandomSequence();
 356         readSettings();
 357         initialize();
 358         colorContext = QColor::enterAllocContext();
 359         needBlank = TRUE;
 360         timer.start( speed );
 361         connect( &timer, SIGNAL( timeout() ), SLOT( slotTimeout() ) );
 362 }
 363
 364 KBannerSaver::~KBannerSaver()
 365 {
 366         timer.stop();
 367         QColor::leaveAllocContext();
 368         QColor::destroyAllocContext( colorContext );
 369         delete krnd;
 370 }
 371
 372 void KBannerSaver::setSpeed( int spd )
 373 {
 374         timer.stop();
 375         int inv = 100 - spd;
 376         speed = 1 + ((inv * inv) / 100);
 377         timer.start( speed );
 378 }
 379
 380 void KBannerSaver::setFont( const QString& family, int size, const QColor &color,
 381                 bool b, bool i )
 382 {
 383         fontFamily = family;
 384         fontSize = size;
 385         fontColor = color;
 386         bold = b;
 387         italic = i;
 388
 389         initialize();
 390 }
 391
 392 void KBannerSaver::setColor(QColor &color)
 393 {
 394     fontColor = color;
 395     cyclingColor = FALSE;
 396     needUpdate = TRUE;
 397 }
 398
 399 void KBannerSaver::setCyclingColor( bool on )
 400 {
 401     cyclingColor = on;
 402     needUpdate = TRUE;
 403 }
 404
 405 void KBannerSaver::setMessage( const QString &msg )
 406 {
 407     showTime = FALSE;
 408     message = msg;
 409     pixmapSize = QSize();
 410     needBlank = TRUE;
 411 }
 412
 413 void KBannerSaver::setTimeDisplay()
 414 {
 415     showTime = TRUE;
 416     pixmapSize = QSize();
 417     needBlank = TRUE;
 418 }
 419
 420 // read settings from config file
 421 void KBannerSaver::readSettings()
 422 {
 423     KConfig *config = KGlobal::config();
 424     config->setGroup( "Settings" );
 425
 426    setSpeed( config->readNumEntry("Speed",50) );
 427
 428    message=config->readEntry("Message","KDE");
 429
 430    showTime=config->readBoolEntry("ShowTime",FALSE);
 431
 432    fontFamily=config->readEntry("FontFamily",(QApplication::font()).family());
 433
 434    fontSize=config->readNumEntry("FontSize",48);
 435
 436    fontColor.setNamedColor(config->readEntry("FontColor","red"));
 437
 438    cyclingColor=config->readBoolEntry("CyclingColor",FALSE);
 439
 440    bold=config->readBoolEntry("FontBold",FALSE);
 441    italic=config->readBoolEntry("FontItalic",FALSE);
 442
 443     if ( cyclingColor )
 444     {
 445         currentHue=0;
 446         fontColor.setHsv(0,SATURATION,VALUE);
 447     }
 448 }
 449
 450 // initialize font
 451 void KBannerSaver::initialize()
 452 {
 453         fsize = fontSize * height() / QApplication::desktop()->height();
 454
 455         font = QFont( fontFamily, fsize, bold ? QFont::Bold : QFont::Normal, italic );
 456
 457         pixmapSize = QSize();
 458         needBlank = TRUE;
 459
 460         xpos = width();
 461         ypos = fsize + (int) ((double)(height()-fsize)*krnd->getDouble());
 462         step = 2 * width() / QApplication::desktop()->width(); // 6 -> 2 -hhjb-
 463         if ( step == 0 )
 464                 step = 1;
 465 }
 466
 467 // erase old text and draw in new position
 468 void KBannerSaver::slotTimeout()
 469 {
 470     if (cyclingColor)
 471     {
 472         int hueStep = speed/10;
 473         currentHue=(currentHue+hueStep)%360;
 474         fontColor.setHsv(currentHue,SATURATION,VALUE);
 475     }
 476     if (showTime)
 477     {
 478         QString new_message = KGlobal::locale()->formatTime(QTime::currentTime(), true);
 479         if( new_message != message )
 480             needUpdate = TRUE;
 481         message = new_message;
 482     }
 483     if ( !pixmapSize.isValid() || cyclingColor || needUpdate || needBlank )
 484     {
 485         QRect rect = QFontMetrics( font ).boundingRect( message );
 486         rect.setWidth( rect.width() + step );
 487         if ( rect.width() > pixmapSize.width() )
 488             pixmapSize.setWidth( rect.width() );
 489         if ( rect.height() > pixmapSize.height() )
 490             pixmapSize.setHeight( rect.height() );
 491         pixmap = QPixmap( pixmapSize );
 492         pixmap.fill( Qt::black );
 493         QPainter p( &pixmap );
 494         p.setFont( font );
 495         p.setPen( fontColor );
 496         p.drawText( -rect.x(), -rect.y(), message );
 497         needUpdate = FALSE;
 498     }
 499     xpos -= step;
 500     if ( xpos < -pixmapSize.width() ) {
 501         QPainter p( this );
 502         p.fillRect( xpos + step, ypos, pixmapSize.width(), pixmapSize.height(), Qt::black );
 503         xpos = width();
 504         ypos = fsize + (int) ((double)(height()-2.0*fsize)*krnd->getDouble());
 505     }
 506
 507     if ( needBlank )
 508     {
 509         setBackgroundColor( Qt::black );
 510         erase();
 511         needBlank = FALSE;
 512     }
 513     bitBlt( this, xpos, ypos, &pixmap, 0, 0, pixmapSize.width(), pixmapSize.height());
 514 }