Add option to input value manually in EditorPropertyEasing

Double-clicking on the EditorPropertyEasing widget (e.g. for the Light
Attenuation parameter) shows an EditorSpinSlider to set the value manually.

Fixes #8449.

Co-authored-by: Rémi Verschelde <rverschelde@gmail.com>

editor/editor_properties.cpp

@@ -29,6 +29,7 @@
 /*************************************************************************/
 
 #include "editor_properties.h"
+
 #include "editor/editor_resource_preview.h"
 #include "editor_node.h"
 #include "editor_properties_array_dict.h"
@@ -925,6 +926,9 @@ void EditorPropertyEasing::_drag_easing(const Ref<InputEvent> &p_ev) {
 		preset->set_global_position(easing_draw->get_global_transform().xform(mb->get_position()));
 		preset->popup();
 	}
+	if (mb.is_valid() && mb->is_doubleclick() && mb->get_button_index() == BUTTON_LEFT) {
+		_setup_spin();
+	}
 
 	Ref<InputEventMouseMotion> mm = p_ev;
 
@@ -963,7 +967,6 @@ void EditorPropertyEasing::_draw_easing() {
 	Size2 s = easing_draw->get_size();
 	Rect2 r(Point2(), s);
 	r = r.grow(3);
-	//get_stylebox("normal", "LineEdit")->draw(ci, r);
 
 	int points = 48;
 
@@ -1006,6 +1009,31 @@ void EditorPropertyEasing::_set_preset(int p_preset) {
 	easing_draw->update();
 }
 
+void EditorPropertyEasing::_setup_spin() {
+	setting = true;
+	spin->setup_and_show();
+	spin->get_line_edit()->set_text(rtos(get_edited_object()->get(get_edited_property())));
+	setting = false;
+	spin->show();
+}
+
+void EditorPropertyEasing::_spin_value_changed(double p_value) {
+	if (setting)
+		return;
+
+	// 0 is a singularity, but both positive and negative values
+	// are otherwise allowed. Enforce 0+ as workaround.
+	if (Math::is_zero_approx(p_value)) {
+		p_value = 0.00001;
+	}
+	emit_changed(get_edited_property(), p_value);
+	_spin_focus_exited();
+}
+
+void EditorPropertyEasing::_spin_focus_exited() {
+	spin->hide();
+}
+
 void EditorPropertyEasing::setup(bool p_full, bool p_flip) {
 
 	flip = p_flip;
@@ -1028,9 +1056,6 @@ void EditorPropertyEasing::_notification(int p_what) {
 			}
 			easing_draw->set_custom_minimum_size(Size2(0, get_font("font", "Label")->get_height() * 2));
 		} break;
-		case NOTIFICATION_RESIZED: {
-
-		} break;
 	}
 }
 
@@ -1039,6 +1064,9 @@ void EditorPropertyEasing::_bind_methods() {
 	ClassDB::bind_method("_draw_easing", &EditorPropertyEasing::_draw_easing);
 	ClassDB::bind_method("_drag_easing", &EditorPropertyEasing::_drag_easing);
 	ClassDB::bind_method("_set_preset", &EditorPropertyEasing::_set_preset);
+
+	ClassDB::bind_method("_spin_value_changed", &EditorPropertyEasing::_spin_value_changed);
+	ClassDB::bind_method("_spin_focus_exited", &EditorPropertyEasing::_spin_focus_exited);
 }
 
 EditorPropertyEasing::EditorPropertyEasing() {
@@ -1053,6 +1081,19 @@ EditorPropertyEasing::EditorPropertyEasing() {
 	add_child(preset);
 	preset->connect("id_pressed", this, "_set_preset");
 
+	spin = memnew(EditorSpinSlider);
+	spin->set_flat(true);
+	spin->set_min(-100);
+	spin->set_max(100);
+	spin->set_step(0);
+	spin->set_hide_slider(true);
+	spin->set_allow_lesser(true);
+	spin->set_allow_greater(true);
+	spin->connect("value_changed", this, "_spin_value_changed");
+	spin->get_line_edit()->connect("focus_exited", this, "_spin_focus_exited");
+	spin->hide();
+	add_child(spin);
+
 	flip = false;
 	full = false;
 }

editor/editor_properties.h

@@ -32,12 +32,12 @@
 #define EDITOR_PROPERTIES_H
 
 #include "editor/create_dialog.h"
-#include "editor/editor_file_system.h"
 #include "editor/editor_inspector.h"
 #include "editor/editor_spin_slider.h"
 #include "editor/property_selector.h"
 #include "editor/scene_tree_editor.h"
 #include "scene/gui/color_picker.h"
+#include "scene/gui/line_edit.h"
 
 class EditorPropertyNil : public EditorProperty {
 	GDCLASS(EditorPropertyNil, EditorProperty);
@@ -308,7 +308,11 @@ class EditorPropertyEasing : public EditorProperty {
 	GDCLASS(EditorPropertyEasing, EditorProperty);
 	Control *easing_draw;
 	PopupMenu *preset;
+	EditorSpinSlider *spin;
+	bool setting;
+
 	bool full;
+	bool flip;
 
 	enum {
 		EASING_ZERO,
@@ -321,13 +325,16 @@ class EditorPropertyEasing : public EditorProperty {
 
 	};
 
-	bool flip;
-
 	void _drag_easing(const Ref<InputEvent> &p_ev);
 	void _draw_easing();
-	void _notification(int p_what);
 	void _set_preset(int);
 
+	void _setup_spin();
+	void _spin_value_changed(double p_value);
+	void _spin_focus_exited();
+
+	void _notification(int p_what);
+
 protected:
 	static void _bind_methods();
 

editor/editor_spin_slider.h

@@ -102,6 +102,9 @@ public:
 
 	void set_custom_label_color(bool p_use_custom_label_color, Color p_custom_label_color);
 
+	void setup_and_show() { _focus_entered(); }
+	LineEdit *get_line_edit() { return value_input; }
+
 	virtual Size2 get_minimum_size() const;
 	EditorSpinSlider();
 };