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SongEditor: added smooth autoscroll

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Instead of flipping to next page when the play position marker reaches
the right edge, scroll to next page smoothly using the QTimeLine class.

Closes #3144318.
This commit is contained in:
Tobias Doerffel
2011-01-05 12:31:24 +01:00
parent 6be555d61a
commit ea94e6aa32
1 changed files with 27 additions and 3 deletions
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30
src/gui/song_editor.cpp
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@@ -22,6 +22,7 @@
*
*/
#include <QtCore/QTimeLine>
#include <QtGui/QAction>
#include <QtGui/QButtonGroup>
#include <QtGui/QKeyEvent>
@@ -649,6 +650,28 @@ void songEditor::updateScrollBar( int _len )
static inline void animateScroll( QScrollBar *scrollBar, int newVal )
{
// do smooth scroll animation using QTimeLine
QTimeLine *t = scrollBar->findChild<QTimeLine *>();
if( t == NULL )
{
t = new QTimeLine( 600, scrollBar );
t->setFrameRange( scrollBar->value(), newVal );
t->connect( t, SIGNAL( finished() ), SLOT( deleteLater() ) );
scrollBar->connect( t, SIGNAL( frameChanged( int ) ), SLOT( setValue( int ) ) );
t->start();
}
else
{
// smooth scrolling is still active, therefore just update the end frame
t->setEndFrame( newVal );
}
}
void songEditor::updatePosition( const midiTime & _t )
{
if( ( m_s->isPlaying() && m_s->m_playMode == song::Mode_PlaySong
@@ -656,11 +679,12 @@ void songEditor::updatePosition( const midiTime & _t )
m_scrollBack == true )
{
const int w = width() - DEFAULT_SETTINGS_WIDGET_WIDTH
- TRACK_OP_WIDTH;
- TRACK_OP_WIDTH
- 32; // rough estimation for width of right scrollbar
if( _t > m_currentPosition + w * midiTime::ticksPerTact() /
pixelsPerTact() )
{
m_leftRightScroll->setValue( _t.getTact() );
animateScroll( m_leftRightScroll, _t.getTact() );
}
else if( _t < m_currentPosition )
{
@@ -668,7 +692,7 @@ void songEditor::updatePosition( const midiTime & _t )
(int)( _t - w * midiTime::ticksPerTact() /
pixelsPerTact() ),
0 );
m_leftRightScroll->setValue( t.getTact() );
animateScroll( m_leftRightScroll, t.getTact() );
}
m_scrollBack = false;
}