reimplementaion of fix for QColorDialog on macOS Sierra bug.

doesn't use destructor because destructor causes another crash.

YACReader/width_slider.h

@@ -0,0 +1,53 @@
+#ifndef WIDTH_SLIDER_H
+#define WIDTH_SLIDER_H
+
+#include <QWidgetAction>
+
+class QLabel;
+class QSlider;
+
+class YACReaderSlider : public QWidget
+{
+    Q_OBJECT
+private:
+    QLabel * percentageLabel;
+    QSlider * slider;
+
+public:
+    YACReaderSlider (QWidget * parent = 0);
+    void show();
+
+protected:
+    virtual void focusOutEvent(QFocusEvent * event);
+    virtual void paintEvent(QPaintEvent *);
+
+public slots:
+    void updateText(int value);
+    void updateZoomRatio(int value);
+    void resetValueToDefault();
+
+
+signals:
+    void zoomRatioChanged(int value);
+};
+
+class YACReaderSliderAction : public QWidgetAction 
+{
+	Q_OBJECT
+private:
+    YACReaderSlider * widget;
+
+public:
+	
+	YACReaderSliderAction (QWidget * parent = 0);
+
+public slots:
+	void updateText(int value);
+    void updateZoomRatio(int value);
+
+
+signals:
+    void zoomRatioChanged(int value);
+};
+
+#endif