timeline/renderer: automatically update timeline view when a visual waveform

has updated

app/widget/timelinewidget/timelinewidget.cpp

@@ -662,10 +662,9 @@ void TimelineWidget::AddBlock(Block *block, TrackReference track)
   case Block::kTransition:
   case Block::kGap:
   {
-    TimelineViewBlockItem* item = new TimelineViewBlockItem();
-
     // Set up clip with view parameters (clip item will automatically size its rect accordingly)
-    item->SetBlock(block);
+    TimelineViewBlockItem* item = new TimelineViewBlockItem(block);
+
     item->SetYCoords(GetTrackY(track), GetTrackHeight(track));
     item->SetScale(GetScale());
     item->SetTrack(track);
@@ -677,6 +676,10 @@ void TimelineWidget::AddBlock(Block *block, TrackReference track)
     views_.at(track.type())->view()->scene()->addItem(item);
 
     connect(block, &Block::Refreshed, this, &TimelineWidget::BlockChanged);
+
+    if (block->type() == Block::kClip) {
+      connect(static_cast<ClipBlock*>(block), &ClipBlock::PreviewUpdated, this, &TimelineWidget::PreviewUpdated);
+    }
     break;
   }
   }
@@ -721,13 +724,22 @@ void TimelineWidget::ViewSelectionChanged()
 
 void TimelineWidget::BlockChanged()
 {
-  TimelineViewRect* rect = block_items_[static_cast<Block*>(sender())];
+  TimelineViewRect* rect = block_items_.value(static_cast<Block*>(sender()));
 
-  if (rect != nullptr) {
+  if (rect) {
     rect->UpdateRect();
   }
 }
 
+void TimelineWidget::PreviewUpdated()
+{
+  TimelineViewRect* rect = block_items_.value(static_cast<Block*>(sender()));
+
+  if (rect) {
+    rect->update();
+  }
+}
+
 void TimelineWidget::UpdateHorizontalSplitters()
 {
   QSplitter* sender_splitter = static_cast<QSplitter*>(sender());

app/widget/timelinewidget/timelinewidget.h

@@ -425,6 +425,8 @@ private slots:
    */
   void BlockChanged();
 
+  void PreviewUpdated();
+
   void UpdateHorizontalSplitters();
 
   void UpdateTimecodeWidthFromSplitters(QSplitter *s);

app/widget/timelinewidget/view/timelineviewblockitem.cpp

@@ -34,23 +34,12 @@
 #include "config/config.h"
 #include "node/block/transition/transition.h"
 
-TimelineViewBlockItem::TimelineViewBlockItem(QGraphicsItem* parent) :
+TimelineViewBlockItem::TimelineViewBlockItem(Block *block, QGraphicsItem* parent) :
   TimelineViewRect(parent),
-  block_(nullptr)
+  block_(block)
 {
   setBrush(Qt::white);
   setCursor(Qt::DragMoveCursor);
-}
-
-Block *TimelineViewBlockItem::block()
-{
-  return block_;
-}
-
-void TimelineViewBlockItem::SetBlock(Block *block)
-{
-  block_ = block;
-
   setFlag(QGraphicsItem::ItemIsSelectable,
           block_->type() == Block::kClip
           || block_->type() == Block::kGap
@@ -59,12 +48,13 @@ void TimelineViewBlockItem::SetBlock(Block *block)
   UpdateRect();
 }
 
+Block *TimelineViewBlockItem::block() const
+{
+  return block_;
+}
+
 void TimelineViewBlockItem::UpdateRect()
 {
-  if (block_ == nullptr) {
-    return;
-  }
-
   double item_left = TimeToScene(block_->in());
   double item_width = TimeToScene(block_->length());
 
@@ -81,12 +71,6 @@ void TimelineViewBlockItem::UpdateRect()
 
 void TimelineViewBlockItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
-  Q_UNUSED(widget)
-
-  if (block_ == nullptr) {
-    return;
-  }
-
   switch (block_->type()) {
   case Block::kClip:
   {

app/widget/timelinewidget/view/timelineviewblockitem.h

@@ -30,10 +30,9 @@
 class TimelineViewBlockItem : public TimelineViewRect
 {
 public:
-  TimelineViewBlockItem(QGraphicsItem* parent = nullptr);
+  TimelineViewBlockItem(Block* block, QGraphicsItem* parent = nullptr);
 
-  Block* block();
-  void SetBlock(Block *block);
+  Block* block() const;
 
   virtual void UpdateRect() override;