gstengine: Add PipelineView class

Add ListView derivative class for displaying GstPipelineModel data. A
GetSelectedIds method provides the list of selected pipelie IDs.

src/CMakeLists.txt

@@ -138,6 +138,7 @@ set(SOURCES
   engines/gstenginepipeline.cpp
   engines/gstelementdeleter.cpp
   engines/gstpipelinebase.cpp
+  engines/pipelineview.cpp
 
   globalsearch/digitallyimportedsearchprovider.cpp
   globalsearch/globalsearch.cpp
@@ -461,6 +462,7 @@ set(HEADERS
   engines/gstenginepipeline.h
   engines/gstelementdeleter.h
   engines/gstpipelinebase.h
+  engines/pipelineview.h
 
   globalsearch/globalsearch.h
   globalsearch/globalsearchmodel.h

src/engines/gstpipelinebase.cpp

@@ -76,3 +76,11 @@ int GstPipelineModel::FindRowById(int id) const {
 
   return -1;
 }
+
+int GstPipelineModel::GetPipelineId(const QModelIndex& index) const {
+  const QStandardItem* item = itemFromIndex(index);
+  if (item != nullptr)
+    return item->data(Role::Role_Id).toInt();
+  else
+    return -1;
+}

src/engines/gstpipelinebase.h

@@ -56,6 +56,10 @@ class GstPipelineModel : public QStandardItemModel {
   void AddPipeline(int id, const QString& name);
   void RemovePipeline(int id);
 
+ private:
+  friend class PipelineView;
+  int GetPipelineId(const QModelIndex& index) const;
+
  private:
   int FindRowById(int id) const;
 

src/engines/pipelineview.cpp

@@ -0,0 +1,38 @@
+/* This file is part of Clementine.
+   Copyright 2021, Jim Broadus <jbroadus@gmail.com>
+
+   Clementine is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Clementine is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "pipelineview.h"
+
+#include "gstpipelinebase.h"
+
+void PipelineView::setPipelineModel(GstPipelineModel* model) {
+  QListView::setModel(model);
+  pipeline_model_ = model;
+}
+
+QList<int> PipelineView::GetSelectedIds() const {
+  QList<int> selected;
+  if (pipeline_model_ != nullptr) {
+    for (const QModelIndex& index : selectedIndexes()) {
+      int id = pipeline_model_->GetPipelineId(index);
+      if (id >= 0) {
+        selected << id;
+      }
+    }
+  }
+  return selected;
+}

src/engines/pipelineview.h

@@ -0,0 +1,39 @@
+/* This file is part of Clementine.
+   Copyright 2021, Jim Broadus <jbroadus@gmail.com>
+
+   Clementine is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Clementine is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef PIPELINEVIEW_H
+#define PIPELINEVIEW_H
+
+#include <QList>
+#include <QListView>
+
+class GstPipelineModel;
+
+class PipelineView : public QListView {
+  Q_OBJECT;
+
+ public:
+  explicit PipelineView(QWidget* parent) : QListView(parent) {}
+
+  void setPipelineModel(GstPipelineModel* model);
+  QList<int> GetSelectedIds() const;
+
+ private:
+  GstPipelineModel* pipeline_model_;
+};
+
+#endif  // PIPELINEVIEW_H