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Automatic scrolling for E-books

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tvpaker
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Hello,
I\'ve read this idea:

viewtopic.php?f=83&t=40161&p=58496&hilit=okular+scrolling#p58496

and i think it should be a function in Okular that would enable you to read e-books but not as complicated as in the link above. What I mean is simple function of automatic scrolling in which you could configure speed and e.g to make pause scrolling by pressing space.
This function is not only useful in reading e-book but viewing pictures, quick reading tables, presentations and so on.
What do you think, do you like this function?
User avatar Giacomo
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If I understand rightly your idea...you can auto-scroll pages by using the Shift + Arrow keys: Shift + Up to scroll up, Shift + Down to scroll down. Keeping Shift and pushing more and more the Arrow keys you can also modify the speed.


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tvpaker
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I meant something fully automatic with out necessity of pressing Shift button. It would be much easier for e-books readers and e.g. people making keynotes to have such a function in Okular. The comfort of reading is much better when you would sat on a chair, drank fizzy drinks and didn't bother pressing Shift button. You are only concentrated on reading. I think that Keynote's presenters would also rather to be focus on presenting keynote, talking to people than pressing the button.
User avatar Giacomo
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So, from a simple user experience point of view, a toolbar-shortcut for auto-scroll? Or with "Automatic" do you think "I open it and it starts to scroll" ?


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tvpaker
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Yes, this is exactly what I mean.
The User
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There'll always be 5 seconds difference at minimum. In this time I prefer pressing shift+arrow. Some pages have a lot of pictures, other pages have test-only. Maybe you have to read source-code or formulas - this is maybe slower - or you have to read tables - this is maybe faster. So the pauses will be even bigger.

But for slide-shows it would be nice.

PS:
You could also create a simple script. You specify the time, the application and the DBus-command. Maybe 25 lines of code.
tvpaker
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Sorry but I am a just simple user. I know how it sounds but I am interested in KDE because of it functionality and beaty and want to develop it by simple ideas. I have never seen the code of any programs ;) . It's magic for me ;D
The User
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Hehe, okay.
There's a technology called DBus. When you open "qdbusviewer" you will see an overview of applications containing some actions. And you can invoke those actions (like next-page) from other applications or scripts. Recognizing keypresses is very simple, waiting few seconds is very simple and repetition is also very simple.

PS:
I had nothing todo and I wanted to learn something about DBus and Ruby. So I've implemented it.
http://kde-apps.org/content/show.php?content=109394
(writing descriptions and searching the kde-apps-password tokk more time than writing the script :D)

Please mark this thread as [Done].
pinotree
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Please note that you can configure a delay for going to the next page while in presentation mode (which is half of what the script does).


Pino Toscano
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The menu in presentation mode would have enough space for a delay configuration.

PS:
I could create a SVN-patch with play/pause-buttons and a delay-spinbox. Is it okay?

(and please don't move it to Done before the discussion is over ;))

PPS:
With this Okular-Patch you can change the speed directly from presentation-mode, you have a pause-button (or you may want to use p or Enter) and a bug is fixed:

Code: Select all
Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt   (Revision 1005676)
+++ CMakeLists.txt   (Arbeitskopie)
@@ -11,7 +11,7 @@
 if( WIN32 )
 find_package( Expat )
 endif( WIN32 )
-find_package( LibKNotificationItem-1 REQUIRED )
+#find_package( LibKNotificationItem-1 REQUIRED )
 
 #require by libs/libkdcraw, gwenview, and okular
 find_package(JPEG REQUIRED)
Index: okular/ui/presentationwidget.h
===================================================================
--- okular/ui/presentationwidget.h   (Revision 1005676)
+++ okular/ui/presentationwidget.h   (Arbeitskopie)
@@ -25,6 +25,8 @@
 class AnnotatorEngine;
 struct PresentationFrame;
 class PresentationSearchBar;
+class QSpinBox;
+class KIcon;
 
 namespace Okular {
 class Action;
@@ -120,9 +122,13 @@
         QStringList m_metaStrings;
         QToolBar * m_topBar;
         QLineEdit *m_pagesEdit;
+   QSpinBox *m_speedBox;
         PresentationSearchBar *m_searchBar;
         KActionCollection * m_ac;
         KSelectAction * m_screenSelect;
+        QAction *m_playPauseAction;
+        KIcon *m_playIcon;
+        KIcon *m_pauseIcon;
         bool m_isSetup;
         bool m_blockNotifications;
         bool m_inBlackScreenMode;
@@ -141,6 +147,8 @@
         void screenResized( int );
         void chooseScreen( QAction * );
         void toggleBlackScreenMode( bool );
+        void changeSpeed( int );
+        void playPause();
 };
 
 #endif
Index: okular/ui/presentationwidget.cpp
===================================================================
--- okular/ui/presentationwidget.cpp   (Revision 1005676)
+++ okular/ui/presentationwidget.cpp   (Arbeitskopie)
@@ -28,6 +28,7 @@
 #include <qvalidator.h>
 #include <qapplication.h>
 #include <qdesktopwidget.h>
+#include <qspinbox.h>
 #include <kcursor.h>
 #include <krandom.h>
 #include <qtoolbar.h>
@@ -40,6 +41,7 @@
 #include <kselectaction.h>
 #include <kshortcut.h>
 #include <kdialog.h>
+#include <kicon.h>
 
 // system includes
 #include <stdlib.h>
@@ -128,9 +130,10 @@
 PresentationWidget::PresentationWidget( QWidget * parent, Okular::Document * doc, KActionCollection * collection )
     : QWidget( 0 /* must be null, to have an independent widget */, Qt::FramelessWindowHint ),
     m_pressedLink( 0 ), m_handCursor( false ), m_drawingEngine( 0 ), m_screenSaverCookie( -1 ),
-    m_parentWidget( parent ),
-    m_document( doc ), m_frameIndex( -1 ), m_topBar( 0 ), m_pagesEdit( 0 ), m_searchBar( 0 ),
-    m_screenSelect( 0 ), m_isSetup( false ), m_blockNotifications( false ), m_inBlackScreenMode( false )
+    m_parentWidget( parent ), m_document( doc ), m_frameIndex( -1 ), m_topBar( 0 ), m_pagesEdit( 0 ),
+    m_speedBox( 0 ), m_searchBar( 0 ), m_screenSelect( 0 ), m_playPauseAction( 0 ),
+    m_playIcon( new KIcon( "media-playback-start" ) ), m_pauseIcon( new KIcon( "media-playback-pause" ) ),
+    m_isSetup( false ), m_blockNotifications( false ), m_inBlackScreenMode( false )
 {
     Q_UNUSED( parent )
     setAttribute( Qt::WA_DeleteOnClose );
@@ -156,6 +159,17 @@
     QSizePolicy sp = m_pagesEdit->sizePolicy();
     sp.setHorizontalPolicy( QSizePolicy::Minimum );
     m_pagesEdit->setSizePolicy( sp );
+    m_speedBox = new QSpinBox( m_topBar );
+    if(Okular::Settings::slidesAdvance())
+       m_playPauseAction = new QAction( *m_pauseIcon, i18n( "Pause" ), m_topBar );
+    else
+    {
+        m_playPauseAction = new QAction( *m_playIcon, i18n( "Continue" ), m_topBar );
+        m_playPauseAction->setDisabled(true);
+    }
+    sp = m_speedBox->sizePolicy();
+    sp.setHorizontalPolicy( QSizePolicy::Minimum );
+    m_speedBox->setSizePolicy(sp);
     QFontMetrics fm( m_pagesEdit->font() );
     QStyleOptionFrame option;
     option.initFrom( m_pagesEdit );
@@ -177,6 +191,9 @@
     connect( eraseDrawingAct, SIGNAL( triggered() ), SLOT( clearDrawings() ) );
     m_topBar->addAction( eraseDrawingAct );
     addAction( eraseDrawingAct );
+    m_topBar->addSeparator();
+    m_topBar->addWidget(m_speedBox);
+    m_topBar->addAction(m_playPauseAction);
     QDesktopWidget *desktop = QApplication::desktop();
     if ( desktop->numScreens() > 1 )
     {
@@ -216,7 +233,12 @@
     m_nextPageTimer = new QTimer( this );
     m_nextPageTimer->setSingleShot( true );
     connect( m_nextPageTimer, SIGNAL( timeout() ), this, SLOT( slotNextPage() ) );
-
+    m_speedBox->setSuffix( i18n( "s" ) );
+    m_speedBox->setValue(Okular::Settings::slidesAdvanceTime());
+    m_speedBox->setMinimum(0);
+    connect( m_speedBox, SIGNAL( valueChanged( int ) ), this, SLOT( changeSpeed( int ) ) );
+    connect( m_playPauseAction, SIGNAL( triggered() ), this, SLOT( playPause() ) );
+   
     // handle cursor appearance as specified in configuration
     if ( Okular::Settings::slidesCursor() == Okular::Settings::EnumSlidesCursor::HiddenDelay )
     {
@@ -261,7 +283,8 @@
         drawingAct->toggle();
     m_document->removePageAnnotations( m_document->viewport().pageNumber, m_currentPageDrawings );
     delete m_drawingEngine;
-
+    delete m_pauseIcon;
+    delete m_playIcon;
     // delete frames
     QVector< PresentationFrame * >::iterator fIt = m_frames.begin(), fEnd = m_frames.end();
     for ( ; fIt != fEnd; ++fIt )
@@ -432,6 +455,11 @@
             else
                 close();
             break;
+        case Qt::Key_Enter:
+        case Qt::Key_P:           
+            if( Okular::Settings::slidesAdvance() )
+                playPause();
+            break;
     }
 }
 
@@ -1169,6 +1197,9 @@
         changePage( m_frameIndex + 1 );
         // auto advance to the next page if set
         startAutoChangeTimer();
+       
+        // if you wouldn't call update pages would sometimes be skipped (because they are never drawn)
+        update();
     }
     else
     {
@@ -1919,5 +1950,31 @@
     m_transitionTimer->start( 0 );
 }
 
+void PresentationWidget::changeSpeed( int seconds )
+{
+    Okular::Settings::setSlidesAdvanceTime( seconds );
+    m_nextPageTimer->stop();
+    m_playPauseAction->setDisabled( seconds == 0 );
+    m_playPauseAction->setIcon( *m_playIcon );
+    m_playPauseAction->setText( i18n( "Continue" ) );
+}
 
+void PresentationWidget::playPause()
+{
+    if(m_nextPageTimer->isActive())
+    {
+        m_nextPageTimer->stop();
+        m_playPauseAction->setIcon( *m_playIcon );
+        m_playPauseAction->setText( i18n( "Continue" ) );
+    }
+    else
+    {
+        // When you press continue, you usually want to see the next page
+        slotNextPage();
+        startAutoChangeTimer();
+        m_playPauseAction->setIcon( *m_pauseIcon );
+        m_playPauseAction->setText( i18n( "Pause" ) );
+    }
+}
+
 #include "presentationwidget.moc"


Could you apply it to the SVN-tree? ;)
tvpaker
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PPS:
With this Okular-Patch you can change the speed directly from presentation-mode, you have a pause-button (or you may want to use p or Enter) and a bug is fixed:

I think that a pause-button is better
The User
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The patch modifies the presentation mode:
In the toolbar you can modify the speed and you've a pause-button. Alternatively you can use p or Enter.
tvpaker
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Oh sorry. I didn't understand.
The User
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Here you can see it without compilation:
Image
tvpaker
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Very nice. Can't wait to see it included in next Okular update.

 
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