Reposition PlaylistSlider when list contents changes or something is resized.

Playlist.cpp

@@ -29,7 +29,7 @@ PlaylistScrollButton::mouseMoveEvent (QMouseEvent *event)
 		npos = m_slider->rect().height()-rect().height();
 	}
 
-	m_slider->doScroll (npos);
+	m_slider->doScroll ();
 }
 
 void
@@ -53,18 +53,40 @@ PlaylistScroller::PlaylistScroller (PlaylistWidget *parent) : QWidget (parent)
 	m_button->move (0, 0);
 }
 		
-int
+void
+PlaylistScroller::setMax (uint max) 
+{ 
+	m_max = max;
+	repositionButton ();
+}
+
+uint
 PlaylistScroller::getMax (void)
 {
 	return rect().height()-m_button->rect().height();
 }
 
+uint
+PlaylistScroller::getPos (void)
+{
+	return (int)((float)(m_button->pos ().y ()) / (float)getMax() * (float)m_max);
+}
+
 void
 PlaylistScroller::setPixmaps (Skin *skin)
 {
 	m_pixmap = skin->getPls (Skin::PLS_RFILL2_0);
 }
 
+void
+PlaylistScroller::repositionButton (void)
+{
+	PlaylistWidget *pw = dynamic_cast<PlaylistWidget *>(parent ());
+	/*  x = 182.6 / (454 - 242) * 224 */
+	int bpos = (int)((float)(pw->getOffset ()) / (float)m_max * (float) getMax ());
+	m_button->move (0, bpos);
+}
+
 void 
 PlaylistScroller::paintEvent (QPaintEvent *event)
 {
@@ -205,6 +227,7 @@ PlaylistWidget::PlaylistWidget (QWidget *parent) : QWidget (parent)
 
 	m_scroller = new PlaylistScroller (this);
 	connect (m_scroller, SIGNAL(scrolled(int)), this, SLOT(doScroll (int)));
+	connect (m_list, SIGNAL(sizeChanged(QSize)), this, SLOT(sizeChangedList (QSize)));
 
 	m_drag = new dragButton (this);
 
@@ -212,16 +235,20 @@ PlaylistWidget::PlaylistWidget (QWidget *parent) : QWidget (parent)
 	resize (275, 300);
 }
 
+void
+PlaylistWidget::sizeChangedList (QSize s)
+{
+	m_scroller->setMax (s.height() - m_view->height());
+}
+
 void
 PlaylistWidget::doScroll (int pos)
 {
-	int npos = ((float)pos) / (float)(m_scroller->getMax()) * float(m_list->height() - m_view->height());
+	m_list->setOffset (pos);
-
+	if (pos == 0) {
-	m_list->setOffset (npos);
-	if (npos == 0) {
 		m_list->update ();
 	} else {
-		m_list->scroll (0, npos);
+		m_list->scroll (0, pos);
 	}
 	QApplication::sendPostedEvents (m_list, 0);
 }
@@ -231,6 +258,7 @@ PlaylistWidget::resizeEvent (QResizeEvent *event)
 {
 	m_view->resize (size().width()-30, size().height()-20-38);
 	m_list->setSize (m_view->size().width(), m_view->size().height());
+	m_scroller->setMax (m_list->height() - m_view->height());
 }
 
 void

Playlist.h

@@ -34,9 +34,13 @@ class PlaylistScroller : public QWidget{
 	public:
 		PlaylistScroller (PlaylistWidget *arent);
 		~PlaylistScroller () {}
-		void doScroll (int p) { emit scrolled(p); }
+		void doScroll (void) { emit scrolled(getPos ()); }
 
-		int getMax (void);
+		uint getPos (void);
+		uint getMax (void);
+		void setMax (uint max);
+
+		void repositionButton (void);
 
 	public slots:
 		void setPixmaps (Skin *skin);
@@ -48,6 +52,8 @@ class PlaylistScroller : public QWidget{
 		void paintEvent (QPaintEvent *event);
 		QPixmap m_pixmap;
 		PlaylistScrollButton *m_button;
+
+		uint m_max;
 };
 
 class PlaylistView : public QWidget {
@@ -65,10 +71,12 @@ class PlaylistWidget : public QWidget {
 
 		void setActive (bool);
 		void switchDisplay (void);
+		uint getOffset (void) const { return m_list->getOffset (); };
 
 	public slots:
 		void setPixmaps (Skin *skin);
 		void doScroll (int);
+		void sizeChangedList (QSize);
 
 	private:
 		void resizeEvent (QResizeEvent *event);
@@ -90,7 +98,6 @@ class PlaylistWidget : public QWidget {
 
 		bool m_active;
 
-
 		PlaylistView *m_view;
 		PlaylistList *m_list;
 		PlaylistScroller *m_scroller;
@@ -115,6 +122,7 @@ class PlaylistWindow : public QMainWindow {
 		void moveEvent (QMoveEvent *event);
 		void resizeEvent (QResizeEvent *event);
 
+
 	private:
 		PlaylistWidget *m_playlist;
 		PlaylistShade *m_shaded;

PlaylistList.cpp

@@ -606,6 +606,7 @@ PlaylistList::addItem (PlaylistItem *i)
 	}
 	if (m_items->count()*getFontH () > size().height()) {
 		resize (size().width(), m_items->count ()*getFontH ());
+		emit sizeChanged (size());
 	}
 }
 

PlaylistList.h

@@ -19,6 +19,7 @@ class PlaylistList : public QWidget {
 		void setSize (int, int);
 		void addItem (PlaylistItem *i);
 		void setOffset (int i) { m_offset = i; }
+		uint getOffset (void) const { return m_offset; }
 
 	public slots:
 		void setPixmaps (Skin *skin);
@@ -29,6 +30,9 @@ class PlaylistList : public QWidget {
 		void setStatus (uint);
 		void settingsSaved ();
 	
+	signals:
+		void sizeChanged (QSize);
+	
 	private:
 		void paintEvent (QPaintEvent *event);
 		void mousePressEvent (QMouseEvent *event);