bunch of stuff. very basic drag/drop now working

aspectratiopixmaplabel.cpp

@@ -0,0 +1,36 @@
+#include "aspectratiopixmaplabel.hpp"
+
+AspectRatioPixmapLabel::AspectRatioPixmapLabel(QWidget *parent) :
+    QLabel(parent)
+{
+    this->setMinimumSize(1,1);
+    setScaledContents(false);
+}
+
+void AspectRatioPixmapLabel::setPixmap ( const QPixmap & p)
+{
+    pix = p;
+    QLabel::setPixmap(scaledPixmap());
+}
+
+int AspectRatioPixmapLabel::heightForWidth( int width ) const
+{
+    return pix.isNull() ? this->height() : ((qreal)pix.height()*width)/pix.width();
+}
+
+QSize AspectRatioPixmapLabel::sizeHint() const
+{
+    int w = this->width();
+    return QSize( w, heightForWidth(w) );
+}
+
+QPixmap AspectRatioPixmapLabel::scaledPixmap() const
+{
+    return pix.scaled(this->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
+}
+
+void AspectRatioPixmapLabel::resizeEvent(QResizeEvent * e)
+{
+    if(!pix.isNull())
+        QLabel::setPixmap(scaledPixmap());
+}