added fast and leightweight timer-framework - widgets requiring periodic updates can simply connect their update-slots to songEditor::periodicUpdate()

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@929 0778d3d1-df1d-0410-868b-ea421aaaa00d

include/song_editor.h

@@ -27,6 +27,8 @@
 #ifndef _SONG_EDITOR_H
 #define _SONG_EDITOR_H
 
+#include <QtCore/QBasicTimer>
+
 #include "track_container_view.h"
 #include "lcd_spinbox.h"
 #include "automatable_slider.h"
@@ -46,10 +48,14 @@ class songEditor : public trackContainerView
 {
 	Q_OBJECT
 public:
-	songEditor( song * _song );
+	songEditor( song * _song, songEditor * & _engine_ptr );
 	virtual ~songEditor();
 
 
+signals:
+	void periodicUpdate( void );
+
+
 private slots:
 	void scrolled( int _new_pos );
 	void updateTimeLinePosition( void );
@@ -70,8 +76,9 @@ private slots:
 
 private:
 	virtual void keyPressEvent( QKeyEvent * _ke );
-	virtual void wheelEvent( QWheelEvent * _we );
 	virtual void paintEvent( QPaintEvent * _pe );
+	virtual void timerEvent( QTimerEvent * _ev );
+	virtual void wheelEvent( QWheelEvent * _we );
 
 	virtual bool allowRubberband( void ) const;
 
@@ -80,6 +87,9 @@ private:
 
 	song * m_s;
 
+	QBasicTimer m_updateTimer;
+
+
 	QScrollBar * m_leftRightScroll;
 
 	QWidget * m_toolBar;

src/gui/song_editor.cpp

@@ -80,11 +80,13 @@
 
 
 
-songEditor::songEditor( song * _song ) :
+songEditor::songEditor( song * _song, songEditor * & _engine_ptr ) :
 	trackContainerView( _song ),
 	m_s( _song ),
 	m_scrollBack( FALSE )
 {
+	_engine_ptr = this;
+
 	setWindowTitle( tr( "Song-Editor" ) );
 	setWindowIcon( embed::getIconPixmap( "songeditor" ) );
 
@@ -371,6 +373,7 @@ songEditor::songEditor( song * _song ) :
 
 	w->show();
 
+	m_updateTimer.start( 1000 / 20, this );	// 20 fps
 }
 
 
@@ -383,10 +386,10 @@ songEditor::~songEditor()
 
 
 
-void songEditor::paintEvent( QPaintEvent * _pe )
+void songEditor::scrolled( int _new_pos )
 {
-	m_leftRightScroll->setMaximum( m_s->length() );
-	trackContainerView::paintEvent( _pe );
+	update();
+	emit positionChanged( m_currentPosition = midiTime( _new_pos, 0 ) );
 }
 
 
@@ -448,11 +451,18 @@ void songEditor::keyPressEvent( QKeyEvent * _ke )
 
 
 
-
-void songEditor::scrolled( int _new_pos )
+void songEditor::paintEvent( QPaintEvent * _pe )
 {
-	update();
-	emit positionChanged( m_currentPosition = midiTime( _new_pos, 0 ) );
+	m_leftRightScroll->setMaximum( m_s->length() );
+	trackContainerView::paintEvent( _pe );
+}
+
+
+
+
+void songEditor::timerEvent( QTimerEvent * )
+{
+	emit periodicUpdate();
 }