From 3437824e420d3cbc3dd6e0e8bb5849955cf36871 Mon Sep 17 00:00:00 2001
From: Martchus <martchus@gmx.net>
Date: Tue, 15 Aug 2017 18:17:11 +0200
Subject: [PATCH] WIP: Display cover when double-clicking preview

---
 gui/picturepreviewselection.cpp | 33 ++++++++++++++++++++++--
 gui/picturepreviewselection.h   | 45 +++++++++++++++++++++++++++++++--
 gui/picturepreviewselection.ui  | 15 ++++++++++-
 3 files changed, 88 insertions(+), 5 deletions(-)

diff --git a/gui/picturepreviewselection.cpp b/gui/picturepreviewselection.cpp
index 45f0e1b..6ff18e3 100644
--- a/gui/picturepreviewselection.cpp
+++ b/gui/picturepreviewselection.cpp
@@ -17,7 +17,7 @@
 #include <c++utilities/io/catchiofailure.h>
 
 #include <QEvent>
-#include <QGraphicsScene>
+#include <QGraphicsSceneMouseEvent>
 #include <QGraphicsTextItem>
 #include <QGraphicsRectItem>
 #include <QFile>
@@ -43,6 +43,18 @@ using namespace ConversionUtilities;
 
 namespace QtGui {
 
+void PicturePreviewScene::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)
+{
+    emit displayRequested();
+    mouseEvent->accept();
+}
+
+void PicturePreview::mousePressEvent(QMouseEvent *mouseEvent)
+{
+    emit displayRequested();
+    mouseEvent->accept();
+}
+
 /*!
  * \brief Constructs a new PicturePreviewSelection for the specified \a tag and \a field.
  */
@@ -520,6 +532,21 @@ void PicturePreviewSelection::dropEvent(QDropEvent *event)
     event->ignore();
 }
 
+void PicturePreviewSelection::mouseDoubleClickEvent(QMouseEvent *event)
+{
+    displaySelected();
+    event->accept();
+}
+
+bool PicturePreviewSelection::eventFilter(QObject *watched, QEvent *event)
+{
+    if(watched == m_scene && event->type() == QEvent::MouseButtonDblClick) {
+        displaySelected();
+        return true;
+    }
+    return QWidget::eventFilter(watched, event);
+}
+
 /*!
  * \brief Handles selected type being switched.
  */
@@ -569,8 +596,10 @@ void PicturePreviewSelection::updateDescription(int lastIndex, int newIndex)
 void PicturePreviewSelection::updatePreview(int index)
 {
     if(!m_scene) {
-        m_scene = new QGraphicsScene(m_ui->previewGraphicsView);
+        m_scene = new PicturePreviewScene(m_ui->previewGraphicsView);
         m_ui->previewGraphicsView->setScene(m_scene);
+        connect(m_scene, &PicturePreviewScene::displayRequested, this, &PicturePreviewSelection::displaySelected);
+        //m_scene->installEventFilter(this);
     }
     if(!m_textItem) {
         m_textItem = new QGraphicsTextItem;
diff --git a/gui/picturepreviewselection.h b/gui/picturepreviewselection.h
index b4a310b..e4c0aed 100644
--- a/gui/picturepreviewselection.h
+++ b/gui/picturepreviewselection.h
@@ -6,11 +6,12 @@
 #include <tagparser/tag.h>
 
 #include <QWidget>
+#include <QGraphicsScene>
+#include <QGraphicsView>
 
 #include <memory>
 
 QT_FORWARD_DECLARE_CLASS(QEvent)
-QT_FORWARD_DECLARE_CLASS(QGraphicsScene)
 QT_FORWARD_DECLARE_CLASS(QGraphicsTextItem)
 QT_FORWARD_DECLARE_CLASS(QGraphicsPixmapItem)
 QT_FORWARD_DECLARE_CLASS(QGraphicsRectItem)
@@ -29,6 +30,44 @@ namespace Ui {
 class PicturePreviewSelection;
 }
 
+class PicturePreviewScene : public QGraphicsScene
+{
+    Q_OBJECT
+
+public:
+    PicturePreviewScene(QObject *parent = nullptr);
+
+signals:
+    void displayRequested();
+
+protected:
+    void mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent);
+};
+
+inline PicturePreviewScene::PicturePreviewScene(QObject *parent) :
+    QGraphicsScene(parent)
+{
+}
+
+class PicturePreview : public QGraphicsView
+{
+    Q_OBJECT
+
+public:
+    PicturePreview(QWidget *parent = nullptr);
+
+signals:
+    void displayRequested();
+
+protected:
+    void mousePressEvent(QMouseEvent *mouseEvent);
+};
+
+inline PicturePreview::PicturePreview(QWidget *parent) :
+    QGraphicsView(parent)
+{
+}
+
 class PicturePreviewSelection : public QWidget
 {
     Q_OBJECT
@@ -62,6 +101,8 @@ protected:
     void resizeEvent(QResizeEvent *event);
     void dragEnterEvent(QDragEnterEvent *event);
     void dropEvent(QDropEvent *event);
+    void mouseDoubleClickEvent(QMouseEvent *event);
+    bool eventFilter(QObject *watched, QEvent *event);
 
 private slots:
     void typeSwitched(int index);
@@ -74,7 +115,7 @@ private:
     void setup(PreviousValueHandling previousValueHandling = PreviousValueHandling::Clear);
 
     std::unique_ptr<Ui::PicturePreviewSelection> m_ui;
-    QGraphicsScene *m_scene;
+    PicturePreviewScene *m_scene;
     QGraphicsTextItem *m_textItem;
     QPixmap m_pixmap;
     QGraphicsPixmapItem *m_pixmapItem;
diff --git a/gui/picturepreviewselection.ui b/gui/picturepreviewselection.ui
index 395eade..936fecf 100644
--- a/gui/picturepreviewselection.ui
+++ b/gui/picturepreviewselection.ui
@@ -2,6 +2,14 @@
 <ui version="4.0">
  <class>QtGui::PicturePreviewSelection</class>
  <widget class="QWidget" name="QtGui::PicturePreviewSelection">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>346</width>
+    <height>260</height>
+   </rect>
+  </property>
   <property name="windowTitle">
    <string>Form</string>
   </property>
@@ -79,7 +87,7 @@
        <number>0</number>
       </property>
       <item>
-       <widget class="QGraphicsView" name="previewGraphicsView">
+       <widget class="PicturePreview" name="previewGraphicsView">
         <property name="sizePolicy">
          <sizepolicy hsizetype="MinimumExpanding" vsizetype="MinimumExpanding">
           <horstretch>0</horstretch>
@@ -203,6 +211,11 @@
    <extends>QLineEdit</extends>
    <header location="global">qtutilities/widgets/clearlineedit.h</header>
   </customwidget>
+  <customwidget>
+   <class>PicturePreview</class>
+   <extends>QGraphicsView</extends>
+   <header>./picturepreview.h</header>
+  </customwidget>
  </customwidgets>
  <resources/>
  <connections/>