Allow dolphin to auto-play previewed media file, click on preview to play/pause videos or audio

Summary:
It is based on D19844.

I did my best to avoid glitches hence the amount of code touched.

Retry after @pekkah D7539
Moved the setting to the information panel context menu, no more timer

Settings screenshot :
{F6700220}

This would mach the same feature in the open/save dialog (although not equivalent)
{F6696456}

FEATURE: 378613
FIXED-IN: 19.08.0
GUI: New information panel context menu option

Test Plan:
Without auto play
  - in dolphin with the information panel opened, and the auto media play feature is disabled (right on the information panel)
  - hover over media files
  - the behavior is the same as before the patch

With auto play
  - in dolphin with the information panel opened, and the auto media play feature is enabled
  - hover over media files
  - media is played automatically
  - hover over another media file, the new media is previewed

Use audio or video file as media.

Reviewers: #dolphin, elvisangelaccio, ngraham

Reviewed By: #dolphin, elvisangelaccio, ngraham

Subscribers: ngraham, broulik, kfm-devel, pekkah

Tags: #dolphin

Differential Revision: https://phabricator.kde.org/D19782

1 files changed, 16 insertions, 4 deletions

diff --git a/src/panels/information/phononwidget.h b/src/panels/information/phononwidget.h
index 971e8c731..b9e7d4f05 100644
--- a/src/panels/information/phononwidget.h
+++ b/src/panels/information/phononwidget.h
@@ -43,14 +43,22 @@ class PhononWidget : public QWidget
 {
     Q_OBJECT
     public:
+
+        enum MediaKind {
+            Video,
+            Audio
+        };
+
         explicit PhononWidget(QWidget *parent = nullptr);
 
-        void setUrl(const QUrl &url);
+        void setUrl(const QUrl &url, MediaKind kind);
         QUrl url() const;
 
         void setVideoSize(const QSize& size);
         QSize videoSize() const;
 
+        void setAutoPlay(bool autoPlay);
+
     signals:
         /**
          * Is emitted whenever the video-state
@@ -62,15 +70,17 @@ class PhononWidget : public QWidget
          */
         void hasVideoChanged(bool hasVideo);
 
+    public slots:
+        void play();
+
     protected:
         void showEvent(QShowEvent *event) override;
         void hideEvent(QHideEvent *event) override;
 
     private slots:
-        void stateChanged(Phonon::State);
-        void play();
+        void stateChanged(Phonon::State newstate);
         void stop();
-        void slotHasVideoChanged(bool);
+        void finished();
 
     private:
         void applyVideoSize();
@@ -87,6 +97,8 @@ class PhononWidget : public QWidget
         Phonon::SeekSlider *m_seekSlider;
         Phonon::AudioOutput *m_audioOutput;
         EmbeddedVideoPlayer *m_videoPlayer;
+        bool m_autoPlay;
+        bool m_isVideo;
 };
 
 #endif // PHONONWIDGET_H