1 files changed, 100 insertions, 0 deletions
diff --git a/src/ui/widget/ink-spinscale.h b/src/ui/widget/ink-spinscale.h
new file mode 100644
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+++ b/src/ui/widget/ink-spinscale.h
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INK_SPINSCALE_H
+#define INK_SPINSCALE_H
+
+/*
+ * Authors:
+ *   Tavmjong Bah <tavmjong@free.fr>
+ *
+ * Copyright  (C) 2017 Tavmjong Bah
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+/**
+   A widget that allows entering a numerical value either by
+   clicking/dragging on a custom Gtk::Scale or by using a
+   Gtk::SpinButton. The custom Gtk::Scale differs from the stock
+   Gtk::Scale in that it includes a label to save space and has a
+   "slow-dragging" mode triggered by the Alt key.
+*/
+
+#include <glibmm/ustring.h>
+
+#include <gtkmm/box.h>
+#include <gtkmm/scale.h>
+
+#include "scrollprotected.h"
+
+namespace Gtk {
+  class SpinButton;
+}
+
+class InkScale : public Inkscape::UI::Widget::ScrollProtected<Gtk::Scale>
+{
+    using parent_type = ScrollProtected<Gtk::Scale>;
+
+ public:
+  InkScale(Glib::RefPtr<Gtk::Adjustment>, Gtk::SpinButton* spinbutton);
+  ~InkScale() override = default;;
+
+  void set_label(Glib::ustring label);
+
+  bool on_draw(const::Cairo::RefPtr<::Cairo::Context>& cr) override;
+
+ protected:
+
+  bool on_button_press_event(GdkEventButton* button_event) override;
+  bool on_button_release_event(GdkEventButton* button_event) override;
+  bool on_motion_notify_event(GdkEventMotion* motion_event) override;
+
+ private:
+
+  double get_fraction();
+  void set_adjustment_value(double x, bool constrained = false);
+
+  Gtk::SpinButton * _spinbutton; // Needed to get placement/text color.
+  Glib::ustring _label;
+
+  bool   _dragging;
+  double _drag_start;
+  double _drag_offset;
+};
+
+class InkSpinScale : public Gtk::Box
+{
+ public:
+
+  // Create an InkSpinScale with a new adjustment.
+  InkSpinScale(double value,
+               double lower,
+               double upper,
+               double step_increment = 1,
+               double page_increment = 10,
+               double page_size = 0);
+
+  // Create an InkSpinScale with a preexisting adjustment.
+  InkSpinScale(Glib::RefPtr<Gtk::Adjustment>);
+
+  ~InkSpinScale() override = default;;
+
+  void set_label(Glib::ustring label);
+  void set_digits(int digits);
+  int  get_digits() const;
+  void set_focus_widget(GtkWidget *focus_widget);
+  Glib::RefPtr<Gtk::Adjustment> get_adjustment() { return _adjustment; };
+
+ protected:
+
+  InkScale*                      _scale;
+  Gtk::SpinButton*               _spinbutton;
+  Glib::RefPtr<Gtk::Adjustment>  _adjustment;
+  GtkWidget*                     _focus_widget = nullptr;
+
+  bool on_key_release_event(GdkEventKey* key_event) override;
+
+ private:
+
+};
+
+#endif // INK_SPINSCALE_H