Add preview for videos

Grab 4 frames from a video and display them in the Viewer. First frame
is @00:01:00, last at length - 1 minute, and the other two are in
between: length / 4 * 2 and 3 (hardcoded).

1 files changed, 15 insertions, 0 deletions

diff --git a/viewer.cpp b/viewer.cpp
index 5b35b96..cd17b6a 100644
--- a/viewer.cpp
+++ b/viewer.cpp
@@ -7,6 +7,7 @@
 #include <QDir>
 #include <QWheelEvent>
 
+#include "helper.h"
 #include "viewer.h"
 
 Viewer::Viewer(QWidget *parent, Qt::WindowFlags f) : QWidget(parent, f), mCurIndex(-1) {
@@ -43,7 +44,21 @@ void Viewer::setFile(const QString &file, bool allFiles){
     }
 }
 
+void Viewer::preview(const QString &file){
+    mFiles.clear();
+    mCurIndex = -1;
+    QPixmap pm = Helper::preview(file);
+    mLabel->setPixmap(pm);
+    QString winTitle = QString(tr("%1 Viewer: [Preview %2]")).arg(qApp->applicationName()).arg(file);
+    setWindowTitle(winTitle);
+    adjustSize();
+}
+
+
 void Viewer::wheelEvent(QWheelEvent *event){
+    if(mCurIndex == -1){
+        return;
+    }
     QPoint numDeg = event->angleDelta() / 8;
     if(numDeg.y() < 0){ //this is scrolling down -> next!
         if(mCurIndex + 1 >= mFiles.count()){