multicam: finished usable implementation

app/widget/multicam/multicamwidget.cpp

@@ -1,13 +1,53 @@
 #include "multicamwidget.h"
+#include "widget/nodeparamview/nodeparamviewundo.h"
 
 namespace olive {
 
 #define super ViewerWidget
 
 MulticamWidget::MulticamWidget(QWidget *parent) :
-  super{parent}
+  super{parent},
+  node_(nullptr)
 {
+  auto_cacher()->SetMulticamMode(true);
 
+  connect(display_widget(), &ViewerDisplayWidget::DragStarted, this, &MulticamWidget::DisplayClicked);
+}
+
+RenderTicketPtr MulticamWidget::GetSingleFrame(const rational &t, bool dry)
+{
+  if (node_) {
+    return auto_cacher()->GetSingleFrame(node_, t, dry);
+  } else {
+    return super::GetSingleFrame(t, dry);
+  }
+}
+
+void MulticamWidget::DisplayClicked(const QPoint &p)
+{
+  if (!node_) {
+    return;
+  }
+
+  QPointF click = display_widget()->ScreenToScenePoint(p);
+  int width = display_widget()->GetVideoParams().width();
+  int height = display_widget()->GetVideoParams().height();
+
+  if (click.x() < 0 || click.y() < 0 || click.x() >= width || click.y() >= height) {
+    return;
+  }
+
+  int rows, cols;
+  node_->GetRowsAndColumns(&rows, &cols);
+
+  int multi = std::max(cols, rows);
+
+  int c = click.x() / (width/multi);
+  int r = click.y() / (height/multi);
+
+  MultiUndoCommand *command = new MultiUndoCommand();
+  command->add_child(new NodeParamSetStandardValueCommand(NodeKeyframeTrackReference(NodeInput(node_, node_->kCurrentInput)), node_->RowsColsToIndex(r, c, rows, cols)));
+  Core::instance()->undo_stack()->push(command);
 }
 
 }