Pipette and "On Preview Widgets" branch. See issue 227

The pipette part is already working quite nice but need to be finished. The widgets part needs more work...

rtgui/gradient.h

@@ -0,0 +1,38 @@
+/*
+ *  This file is part of RawTherapee.
+ */
+#ifndef _GRADIENT_H_
+#define _GRADIENT_H_
+
+#include <gtkmm.h>
+#include "adjuster.h"
+#include "toolpanel.h"
+
+class Gradient : public Gtk::VBox, public AdjusterListener, public FoldableToolPanel {
+
+  protected:
+    Gtk::CheckButton* enabled;
+    Adjuster* degree;
+    Adjuster* feather;
+    Adjuster* strength;
+    Adjuster* centerX;
+    Adjuster* centerY;
+    bool lastEnabled;
+    sigc::connection enaConn;
+
+  public:
+
+    Gradient ();
+
+    void read           (const rtengine::procparams::ProcParams* pp, const ParamsEdited* pedited=NULL); 
+    void write          (rtengine::procparams::ProcParams* pp, ParamsEdited* pedited=NULL);
+    void setDefaults    (const rtengine::procparams::ProcParams* defParams, const ParamsEdited* pedited=NULL);
+    void setBatchMode   (bool batchMode);
+
+    void adjusterChanged (Adjuster* a, double newval);
+    void enabledChanged ();
+    void setAdjusterBehavior (bool degreeadd, bool featheradd, bool strengthadd, bool centeradd);
+    void trimValues          (rtengine::procparams::ProcParams* pp);
+};
+
+#endif