playlist selector: added scrolling

git-svn-id: http://svn.code.sf.net/p/qmmp-dev/code/trunk/qmmp@1382 90c681e8-e032-0410-971d-27865f9a5e38

1 files changed, 110 insertions, 16 deletions

diff --git a/src/ui/playlistselector.cpp b/src/ui/playlistselector.cpp
index 534aa6bf0..031d4627d 100644
--- a/src/ui/playlistselector.cpp
+++ b/src/ui/playlistselector.cpp
@@ -32,12 +32,15 @@
 PlayListSelector::PlayListSelector(PlayListManager *manager, QWidget *parent) : QWidget(parent)
 {
     m_update = FALSE;
+    m_scrollable = FALSE;
+    m_offset = 0;
+    m_offset_max = 0;
     m_skin = Skin::instance();
     m_pl_manager = manager;
     connect(m_pl_manager, SIGNAL(playListsChanged()), SLOT(updateTabs()));
-    connect(m_skin, SIGNAL(skinChanged()), this, SLOT(updateSkin()));
-    readSettings();
+    connect(m_skin, SIGNAL(skinChanged()), this, SLOT(updateSkin()));    
     loadColors();
+    readSettings();
     updateTabs();
 }
 
@@ -52,6 +55,7 @@ void PlayListSelector::readSettings()
     {
         delete m_metrics;
         m_metrics = new QFontMetrics(m_font);
+        updateTabs();
     }
     else
     {
@@ -60,6 +64,7 @@ void PlayListSelector::readSettings()
     m_metrics = new QFontMetrics(m_font);
 
     resize(width(), m_metrics->height () +1);
+    drawButtons();
 }
 
 void PlayListSelector::updateTabs()
@@ -71,54 +76,81 @@ void PlayListSelector::updateTabs()
         if(m_rects.isEmpty())
             rect.setX(9);
         else
-            rect.setX(m_rects.last().x() + m_rects.last().width() + m_metrics->width(" | "));
+            rect.setX(m_rects.last().right() + m_metrics->width(" | "));
         rect.setY(0);
         rect.setWidth(m_metrics->width(text));
         rect.setHeight(m_metrics->ascent ());
         m_rects.append(rect);
     }
+    updateScrollers();
     update();
 }
 
 void PlayListSelector::updateSkin()
 {
     loadColors();
+    drawButtons();
     updateTabs();
 }
 
 void PlayListSelector::paintEvent(QPaintEvent *)
 {
-    QPainter m_painter(this);
-    m_painter.setFont(m_font);
-    m_painter.setBrush(QBrush(m_normal_bg));
-    m_painter.drawRect(-1,-1,width()+1,height()+1);
+    QPainter painter(this);
+    painter.setFont(m_font);
+    painter.setBrush(QBrush(m_normal_bg));
+    painter.drawRect(-1,-1,width()+1,height()+1);
     QStringList names = m_pl_manager->playListNames();
     int current = m_pl_manager->indexOf(m_pl_manager->currentPlayList());
     int selected = m_pl_manager->indexOf(m_pl_manager->selectedPlayList());
-    m_painter.setBrush(QBrush(m_selected_bg));
-    m_painter.setPen(m_selected_bg);
-    m_painter.drawRect(m_rects.at(selected).x()-3, 0, m_rects.at(selected).width()+4, height()-1);
+    painter.setBrush(QBrush(m_selected_bg));
+    painter.setPen(m_selected_bg);
+    painter.drawRect(m_rects.at(selected).x()- 3 - m_offset, 0,
+                     m_rects.at(selected).width()+4, height()-1);
 
     for (int i = 0; i < m_rects.size(); ++i)
     {
         if(i == current)
-             m_painter.setPen(m_current);
+             painter.setPen(m_current);
         else
-             m_painter.setPen(m_normal);
-        m_painter.drawText(m_rects[i].x(), m_metrics->ascent(), names.at(i));
+             painter.setPen(m_normal);
+        painter.drawText(m_rects[i].x() - m_offset, m_metrics->ascent(), names.at(i));
         if(i < m_rects.size() - 1)
         {
-            m_painter.setPen(m_normal);
-            m_painter.drawText(m_rects[i].x() + m_rects[i].width(), m_metrics->ascent(), " | ");
+            painter.setPen(m_normal);
+            painter.drawText(m_rects[i].x() + m_rects[i].width() - m_offset, m_metrics->ascent(), " | ");
         }
     }
+    if(m_scrollable)
+    {
+        painter.drawPixmap(width()-40, 0, m_pixmap);
+        painter.setBrush(QBrush(m_normal_bg));
+        painter.setPen(m_normal_bg);
+        painter.drawRect(0,0,6,height());
+    }
 }
 
 void PlayListSelector::mousePressEvent (QMouseEvent *e)
 {
+    if(m_scrollable && e->x() > width() - 20)
+    {
+        m_offset += m_rects.at(lastVisible()).right() - m_offset - width() + 42;
+        m_offset = qMin(m_offset, m_offset_max);
+        update();
+        return;
+    }
+    if(m_scrollable && (width() - 40 < e->x()) && (e->x() <= width() - 20))
+    {
+        m_offset -=  11 - m_rects.at(firstVisible()).x() + m_offset;
+        m_offset = qMax(0, m_offset);
+        update();
+        return;
+    }
+
+    QPoint pp = e->pos();
+    pp.rx() += m_offset;
     for(int i = 0; i < m_rects.count(); ++i)
     {
-        if(m_rects.at(i).contains(e->pos()))
+        if(m_rects.at(i).contains(pp))
         {
             m_pl_manager->selectPlayList(i);
             break;
@@ -126,6 +158,11 @@ void PlayListSelector::mousePressEvent (QMouseEvent *e)
     }
 }
 
+void PlayListSelector::resizeEvent (QResizeEvent *)
+{
+    updateScrollers();
+}
+
 void PlayListSelector::loadColors()
 {
     m_normal.setNamedColor(m_skin->getPLValue("normal"));
@@ -133,3 +170,60 @@ void PlayListSelector::loadColors()
     m_normal_bg.setNamedColor(m_skin->getPLValue("normalbg"));
     m_selected_bg.setNamedColor(m_skin->getPLValue("selectedbg"));
 }
+
+void PlayListSelector::drawButtons()
+{
+    m_pixmap = QPixmap(40, height());
+    m_pixmap.fill(m_normal_bg);
+    QPainter painter(&m_pixmap);
+    painter.setPen(m_normal);
+    painter.setBrush(QBrush(m_normal));
+    QPoint points[3] = {
+        QPoint(m_pixmap.width() - 25, height()/2 - 6),
+        QPoint(m_pixmap.width() - 35, height()/2-1),
+        QPoint(m_pixmap.width() - 25, height()/2 + 4),
+    };
+    painter.drawPolygon(points, 3);
+
+    QPoint points2[3] = {
+        QPoint(m_pixmap.width() - 20, height()/2 - 6),
+        QPoint(m_pixmap.width() - 10, height()/2-1),
+        QPoint(m_pixmap.width() - 20, height()/2 + 4),
+    };
+    painter.drawPolygon(points2, 3);
+}
+
+void PlayListSelector::updateScrollers()
+{
+    m_scrollable = m_rects.last().right() > width();
+    if(m_scrollable)
+    {
+        m_offset_max = m_rects.last().right() - width() + 42;
+        m_offset = qMin(m_offset, m_offset_max);
+    }
+    else
+    {
+         m_offset = 0;
+         m_offset_max = 0;
+    }
+}
+
+int PlayListSelector::firstVisible()
+{
+    for(int i = 0; i < m_rects.size(); ++i)
+    {
+        if(m_rects.at(i).right() - m_offset + m_metrics->width(" - ") + 2 >= 9)
+            return i;
+    }
+    return 0;
+}
+
+int PlayListSelector::lastVisible()
+{
+    for(int i = m_rects.size() - 1; i >= 0; --i)
+    {
+        if(m_rects.at(i).x() - m_offset -  m_metrics->width(" - ") - 2 <= width() - 40)
+            return i;
+    }
+    return m_rects.count() - 1;
+}