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-rw-r--r--src/ui/widget/gradient-with-stops.h117
1 files changed, 117 insertions, 0 deletions
diff --git a/src/ui/widget/gradient-with-stops.h b/src/ui/widget/gradient-with-stops.h
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+++ b/src/ui/widget/gradient-with-stops.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_GRADIENT_WITH_STOPS_H
+#define SEEN_GRADIENT_WITH_STOPS_H
+
+#include <gtkmm/widget.h>
+#include <gdkmm/color.h>
+#include "ui/svg-renderer.h"
+#include "helper/auto-connection.h"
+
+class SPGradient;
+
+namespace Inkscape {
+namespace UI {
+namespace Widget {
+
+class GradientWithStops : public Gtk::DrawingArea {
+public:
+ GradientWithStops();
+
+ // gradient to draw or nullptr
+ void set_gradient(SPGradient* gradient);
+
+ // set selected stop handle (or pass -1 to deselect)
+ void set_focused_stop(int index);
+
+ // stop has been selected
+ sigc::signal<void (size_t)>& signal_stop_selected() {
+ return _signal_stop_selected;
+ }
+
+ // request to change stop's offset
+ sigc::signal<void (size_t, double)>& signal_stop_offset_changed() {
+ return _signal_stop_offset_changed;
+ }
+
+ sigc::signal<void (double)>& signal_add_stop_at() {
+ return _signal_add_stop_at;
+ }
+
+ sigc::signal<void (size_t)>& signal_delete_stop() {
+ return _signal_delete_stop;
+ }
+
+private:
+ void get_preferred_width_vfunc(int& minimum_width, int& natural_width) const override;
+ void get_preferred_height_vfunc(int& minimum_height, int& natural_height) const override;
+ bool on_draw(const Cairo::RefPtr<Cairo::Context>& cr) override;
+ void on_style_updated() override;
+ bool on_button_press_event(GdkEventButton* event) override;
+ bool on_button_release_event(GdkEventButton* event) override;
+ bool on_motion_notify_event(GdkEventMotion* event) override;
+ bool on_key_press_event(GdkEventKey* key_event) override;
+ bool on_focus_in_event(GdkEventFocus* event) override;
+ bool on_focus_out_event(GdkEventFocus* event) override;
+ bool on_focus(Gtk::DirectionType direction) override;
+ void size_request(GtkRequisition* requisition) const;
+ void modified();
+ // repaint widget
+ void update();
+ // index of gradient stop handle under (x, y) or -1
+ int find_stop_at(double x, double y) const;
+ // request stop move
+ void move_stop(int stop_index, double offset_shift);
+
+ // layout of gradient image/editor
+ struct layout_t {
+ double x, y, width, height;
+ };
+ layout_t get_layout() const;
+
+ // position of single gradient stop handle
+ struct stop_pos_t {
+ double left, tip, right, top, bottom;
+ };
+ stop_pos_t get_stop_position(size_t index, const layout_t& layout) const;
+
+ struct limits_t {
+ double min_offset, max_offset, offset;
+ };
+ limits_t get_stop_limits(int index) const;
+ GdkCursor* get_cursor(double x, double y) const;
+
+ SPGradient* _gradient = nullptr;
+ struct stop_t {
+ double offset;
+ SPColor color;
+ double opacity;
+ };
+ std::vector<stop_t> _stops;
+ // handle stop SVG template
+ svg_renderer _template;
+ // selected handle indicator
+ svg_renderer _tip_template;
+ auto_connection _release;
+ auto_connection _modified;
+ Gdk::RGBA _background_color;
+ sigc::signal<void (size_t)> _signal_stop_selected;
+ sigc::signal<void (size_t, double)> _signal_stop_offset_changed;
+ sigc::signal<void (double)> _signal_add_stop_at;
+ sigc::signal<void (size_t)> _signal_delete_stop;
+ bool _dragging = false;
+ // index of handle stop that user clicked; may be out of range
+ int _focused_stop = -1;
+ double _pointer_x = 0;
+ double _stop_offset = 0;
+ Glib::RefPtr<Gdk::Cursor> _cursor_mouseover;
+ Glib::RefPtr<Gdk::Cursor> _cursor_dragging;
+ Glib::RefPtr<Gdk::Cursor> _cursor_insert;
+ // TODO: customize this amount or read prefs
+ double _stop_move_increment = 0.01;
+};
+
+} // namespace Widget
+} // namespace UI
+} // namespace Inkscape
+
+#endif