Timeline design (inspired from kdenlive)

src/gui/MainWindow.cpp

@@ -50,6 +50,7 @@ void MainWindow::changeEvent( QEvent *e )
 void MainWindow::m_initializeDockWidgets( void )
 {
     Timeline* timeline = new Timeline( this );
+    timeline->setSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
     timeline->show();
     setCentralWidget( timeline );
 

src/gui/Timeline.cpp

@@ -20,6 +20,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  *****************************************************************************/
 
+#include <QHBoxLayout>
 #include "Timeline.h"
 #include "TracksView.h"
 #include "TracksScene.h"
@@ -28,8 +29,18 @@ Timeline::Timeline( QWidget *parent ) :
     QWidget( parent )
 {
     m_ui.setupUi( this );
+
     m_tracksScene = new TracksScene( this );
     m_tracksView = new TracksView( m_tracksScene, m_ui.tracksFrame );
+    m_tracksView->setSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
+    m_tracksView->scale(1, 1);
+    m_tracksView->setAlignment( Qt::AlignLeft | Qt::AlignTop );
+
+    QHBoxLayout* tracksLayout = new QHBoxLayout();
+    tracksLayout->setContentsMargins( 0, 0, 0, 0 );
+    m_ui.tracksFrame->setLayout( tracksLayout );
+    tracksLayout->addWidget( m_tracksView );
+
 }
 
 void Timeline::changeEvent( QEvent *e )

src/gui/Timeline.h

@@ -33,6 +33,8 @@ class Timeline : public QWidget
     Q_DISABLE_COPY( Timeline )
 public:
     explicit Timeline( QWidget *parent = 0 );
+    TracksView* tracksView() { return m_tracksView; }
+    TracksScene* tracksScene() { return m_tracksScene; }
 
 protected:
     virtual void changeEvent( QEvent *e );

src/gui/TracksScene.h

@@ -27,6 +27,8 @@
 
 class TracksScene : public QGraphicsScene
 {
+    Q_OBJECT
+
 public:
     TracksScene( QObject* parent = 0 );
 };

src/gui/TracksView.cpp

@@ -20,9 +20,59 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  *****************************************************************************/
 
+#include <QScrollBar>
 #include "TracksView.h"
 
 TracksView::TracksView( QGraphicsScene* scene, QWidget* parent )
-        : QGraphicsView( scene, parent )
+        : QGraphicsView( scene, parent ), m_scene( scene )
 {
+    //TODO should be defined by the settings
+    m_tracksHeight = 50;
+
+    //TODO should be dynamic
+    m_tracksCount = 5;
+    setDuration( 800 );
+
+    setMouseTracking( true );
+    setAcceptDrops( true );
+    setContentsMargins( 0, 0, 0, 0 );
+
+    const int maxHeight = m_tracksHeight * m_tracksCount;
+    setSceneRect( 0, 0, sceneRect().width(), maxHeight );
+}
+
+void TracksView::setDuration( int duration )
+{
+    int diff = qAbs( duration - sceneRect().width() );
+    if ( diff * matrix().m11() > -50 )
+    {
+        if ( matrix().m11() < 0.4 )
+            setSceneRect( 0, 0, ( duration + 100 / matrix().m11() ), sceneRect().height() );
+        else
+            setSceneRect( 0, 0, ( duration + 300 ), sceneRect().height() );
+    }
+    m_projectDuration = duration;
+}
+
+void TracksView::resizeEvent( QResizeEvent* event )
+{
+    QGraphicsView::resizeEvent( event );
+}
+
+void TracksView::drawBackground( QPainter* painter, const QRectF& rect )
+{
+    QColor base = palette().button().color();
+    QRectF r = rect;
+    r.setWidth( r.width() + 1 );
+
+    painter->setClipRect( r );
+    painter->drawLine( r.left(), 0, r.right(), 0 );
+
+    uint tracks = m_tracksCount;
+    for ( uint i = 0; i < tracks; ++i )
+        painter->drawLine( r.left(), m_tracksHeight * ( i + 1 ), r.right(), m_tracksHeight * ( i + 1 ) );
+
+    int lowerLimit = m_tracksHeight * m_tracksCount + 1;
+    if ( height() > lowerLimit )
+        painter->fillRect( QRectF ( r.left(), lowerLimit, r.width(), height() - lowerLimit ), QBrush( base ) );
 }

src/gui/TracksView.h

@@ -27,8 +27,22 @@
 
 class TracksView : public QGraphicsView
 {
+    Q_OBJECT
+
 public:
     TracksView( QGraphicsScene* scene, QWidget* parent = 0 );
+    void setDuration( int duration );
+    int duration() { return m_projectDuration; }
+
+protected:
+    virtual void resizeEvent( QResizeEvent* event );
+    virtual void drawBackground( QPainter* painter, const QRectF& rect );
+
+private:
+    QGraphicsScene* m_scene;
+    int m_tracksHeight;
+    int m_tracksCount;
+    int m_projectDuration;
 };
 
 #endif // TRACKSVIEW_H

src/gui/ui/Timeline.ui

@@ -6,10 +6,16 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>429</width>
-    <height>167</height>
+    <width>400</width>
+    <height>150</height>
    </rect>
   </property>
+  <property name="minimumSize">
+   <size>
+    <width>400</width>
+    <height>150</height>
+   </size>
+  </property>
   <property name="windowTitle">
    <string>Form</string>
   </property>