timeline: add links when trimming adjacent gaps

Fixes #1808

app/widget/timelinewidget/tool/pointer.cpp

@@ -171,7 +171,7 @@ void PointerTool::MouseMove(TimelineViewMouseEvent *event)
 
       // If we're performing an action, we can initiate ghosts
       if (drag_movement_mode_ != Timeline::kNone) {
-        InitiateDrag(clicked_item_, drag_movement_mode_);
+        InitiateDrag(clicked_item_, drag_movement_mode_, event->GetModifiers());
       }
 
       // Set dragging to true here so no matter what, the drag isn't re-initiated until it's completed
@@ -244,6 +244,7 @@ void SetGhostToSlideMode(TimelineViewGhostItem* g)
 
 void PointerTool::InitiateDragInternal(Block *clicked_item,
                                        Timeline::MovementMode trim_mode,
+                                       Qt::KeyboardModifiers modifiers,
                                        bool dont_roll_trims,
                                        bool allow_nongap_rolling,
                                        bool slide_instead_of_moving)
@@ -407,30 +408,41 @@ void PointerTool::InitiateDragInternal(Block *clicked_item,
         }
 
         Timeline::MovementMode flipped_mode = FlipTrimMode(trim_mode);
-        TimelineViewGhostItem* adjacent_ghost;
+        QVector<TimelineViewGhostItem*> adjacent_ghosts;
 
         if (adjacent) {
-          adjacent_ghost = AddGhostFromBlock(adjacent, flipped_mode);
+          adjacent_ghosts.append(AddGhostFromBlock(adjacent, flipped_mode));
+
+          // Select adjacent's links if applicable
+          // FIXME: The check for `clips.size() == 1` may not be necessary, but I don't know yet.
+          //        I'm only including it to prevent any potentially unintended behavior.
+          if (clips.size() == 1 && !(modifiers & Qt::AltModifier)) {
+            if (ClipBlock *adjacent_clip = dynamic_cast<ClipBlock*>(adjacent)) {
+              foreach (Block *adjacent_link, adjacent_clip->block_links()) {
+                adjacent_ghosts.append(AddGhostFromBlock(adjacent_link, flipped_mode));
+              }
+            }
+          }
         } else if (trim_mode == Timeline::kTrimIn || block->next()) {
           rational null_ghost_pos = (trim_mode == Timeline::kTrimIn) ? block->in() : block->out();
 
-          adjacent_ghost = AddGhostFromNull(null_ghost_pos, null_ghost_pos, clip_item->track()->ToReference(), flipped_mode);
-        } else {
-          adjacent_ghost = nullptr;
+          adjacent_ghosts.append(AddGhostFromNull(null_ghost_pos, null_ghost_pos, clip_item->track()->ToReference(), flipped_mode));
         }
 
         // If we have an adjacent block (for any reason), this is a roll edit and the adjacent is
         // expected to fill the remaining space (no gap needs to be created)
         ghost->SetData(TimelineViewGhostItem::kTrimIsARollEdit, static_cast<bool>(adjacent));
 
-        if (adjacent_ghost) {
-          if (treat_trim_as_slide) {
-            // We're sliding a transition rather than a pure trim/roll
-            SetGhostToSlideMode(adjacent_ghost);
-          } else if (dynamic_cast<GapBlock*>(block)) {
-            ghost->SetData(TimelineViewGhostItem::kTrimShouldBeIgnored, true);
-          } else {
-            adjacent_ghost->SetData(TimelineViewGhostItem::kTrimShouldBeIgnored, true);
+        foreach (TimelineViewGhostItem *adjacent_ghost, adjacent_ghosts) {
+          if (adjacent_ghost) {
+            if (treat_trim_as_slide) {
+              // We're sliding a transition rather than a pure trim/roll
+              SetGhostToSlideMode(adjacent_ghost);
+            } else if (dynamic_cast<GapBlock*>(block)) {
+              ghost->SetData(TimelineViewGhostItem::kTrimShouldBeIgnored, true);
+            } else {
+              adjacent_ghost->SetData(TimelineViewGhostItem::kTrimShouldBeIgnored, true);
+            }
           }
         }
       }
@@ -716,9 +728,9 @@ Timeline::MovementMode PointerTool::IsCursorInTrimHandle(Block *block, qreal cur
   }
 }
 
-void PointerTool::InitiateDrag(Block *clicked_item, Timeline::MovementMode trim_mode)
+void PointerTool::InitiateDrag(Block *clicked_item, Timeline::MovementMode trim_mode, Qt::KeyboardModifiers modifiers)
 {
-  InitiateDragInternal(clicked_item, trim_mode, false, false, false);
+  InitiateDragInternal(clicked_item, trim_mode, modifiers, false, false, false);
 }
 
 //#define HIDE_GAP_GHOSTS

app/widget/timelinewidget/tool/pointer.h

@@ -39,7 +39,7 @@ public:
 protected:
   virtual void FinishDrag(TimelineViewMouseEvent *event);
 
-  virtual void InitiateDrag(Block* clicked_item, Timeline::MovementMode trim_mode);
+  virtual void InitiateDrag(Block* clicked_item, Timeline::MovementMode trim_mode, Qt::KeyboardModifiers modifiers);
 
   TimelineViewGhostItem* AddGhostFromBlock(Block *block, Timeline::MovementMode mode, bool check_if_exists = false);
 
@@ -65,6 +65,7 @@ protected:
 
   void InitiateDragInternal(Block* clicked_item,
                             Timeline::MovementMode trim_mode,
+                            Qt::KeyboardModifiers modifiers,
                             bool dont_roll_trims,
                             bool allow_nongap_rolling, bool slide_instead_of_moving);
 

app/widget/timelinewidget/tool/ripple.cpp

@@ -34,10 +34,9 @@ RippleTool::RippleTool(TimelineWidget* parent) :
   SetGapTrimmingAllowed(true);
 }
 
-void RippleTool::InitiateDrag(Block *clicked_item,
-                              Timeline::MovementMode trim_mode)
+void RippleTool::InitiateDrag(Block *clicked_item, Timeline::MovementMode trim_mode, Qt::KeyboardModifiers modifiers)
 {
-  InitiateDragInternal(clicked_item, trim_mode, true, true, false);
+  InitiateDragInternal(clicked_item, trim_mode, modifiers, true, true, false);
 
   if (!parent()->HasGhosts()) {
     return;

app/widget/timelinewidget/tool/ripple.h

@@ -32,8 +32,7 @@ public:
 protected:
   virtual void FinishDrag(TimelineViewMouseEvent *event) override;
 
-  virtual void InitiateDrag(Block* clicked_item,
-                            Timeline::MovementMode trim_mode) override;
+  virtual void InitiateDrag(Block* clicked_item, Timeline::MovementMode trim_mode, Qt::KeyboardModifiers modifiers) override;
 };
 
 }

app/widget/timelinewidget/tool/rolling.cpp

@@ -33,10 +33,9 @@ RollingTool::RollingTool(TimelineWidget* parent) :
   SetGapTrimmingAllowed(true);
 }
 
-void RollingTool::InitiateDrag(Block *clicked_item,
-                                               Timeline::MovementMode trim_mode)
+void RollingTool::InitiateDrag(Block *clicked_item, Timeline::MovementMode trim_mode, Qt::KeyboardModifiers modifiers)
 {
-  InitiateDragInternal(clicked_item, trim_mode, false, true, false);
+  InitiateDragInternal(clicked_item, trim_mode, modifiers, false, true, false);
 }
 
 }

app/widget/timelinewidget/tool/rolling.h

@@ -31,8 +31,7 @@ public:
   RollingTool(TimelineWidget* parent);
 
 protected:
-  virtual void InitiateDrag(Block* clicked_item,
-                            Timeline::MovementMode trim_mode) override;
+  virtual void InitiateDrag(Block* clicked_item, Timeline::MovementMode trim_mode, Qt::KeyboardModifiers modifiers) override;
 };
 
 }

app/widget/timelinewidget/tool/slide.cpp

@@ -34,9 +34,9 @@ SlideTool::SlideTool(TimelineWidget* parent) :
   SetGapTrimmingAllowed(true);
 }
 
-void SlideTool::InitiateDrag(Block *clicked_item, Timeline::MovementMode trim_mode)
+void SlideTool::InitiateDrag(Block *clicked_item, Timeline::MovementMode trim_mode, Qt::KeyboardModifiers modifiers)
 {
-  InitiateDragInternal(clicked_item, trim_mode, false, true, true);
+  InitiateDragInternal(clicked_item, trim_mode, modifiers, false, true, true);
 }
 
 }

app/widget/timelinewidget/tool/slide.h

@@ -31,8 +31,7 @@ public:
   SlideTool(TimelineWidget* parent);
 
 protected:
-  virtual void InitiateDrag(Block* clicked_item,
-                            Timeline::MovementMode trim_mode) override;
+  virtual void InitiateDrag(Block* clicked_item, Timeline::MovementMode trim_mode, Qt::KeyboardModifiers modifiers) override;
 
 };