godot/editor/plugins/tool_button_editor_plugin.cpp

/**************************************************************************/
/*  tool_button_editor_plugin.cpp                                         */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#include "tool_button_editor_plugin.h"

#include "scene/gui/button.h"

void EditorInspectorToolButtonPlugin::_update_action_icon(Button *p_action_button, const String &p_action_icon) {
	p_action_button->set_button_icon(p_action_button->get_editor_theme_icon(p_action_icon));
}

void EditorInspectorToolButtonPlugin::_call_action(const Variant &p_object, const StringName &p_property) {
	Object *object = p_object.get_validated_object();
	ERR_FAIL_NULL_MSG(object, vformat(R"(Failed to get property "%s" on a previously freed instance.)", p_property));

	const Variant value = object->get(p_property);
	ERR_FAIL_COND_MSG(value.get_type() != Variant::CALLABLE, vformat(R"(The value of property "%s" is %s, but Callable was expected.)", p_property, Variant::get_type_name(value.get_type())));

	const Callable callable = value;
	ERR_FAIL_COND_MSG(!callable.is_valid(), vformat(R"(Tool button action "%s" is an invalid callable.)", callable));

	Variant ret;
	Callable::CallError ce;
	callable.callp(nullptr, 0, ret, ce);
	ERR_FAIL_COND_MSG(ce.error != Callable::CallError::CALL_OK, vformat(R"(Error calling tool button action "%s": %s)", callable, Variant::get_call_error_text(callable.get_method(), nullptr, 0, ce)));
}

bool EditorInspectorToolButtonPlugin::can_handle(Object *p_object) {
	return true;
}

bool EditorInspectorToolButtonPlugin::parse_property(Object *p_object, const Variant::Type p_type, const String &p_path, const PropertyHint p_hint, const String &p_hint_text, const BitField<PropertyUsageFlags> p_usage, const bool p_wide) {
	if (p_type != Variant::CALLABLE || p_hint != PROPERTY_HINT_TOOL_BUTTON || !p_usage.has_flag(PROPERTY_USAGE_EDITOR)) {
		return false;
	}

	const PackedStringArray splits = p_hint_text.rsplit(",", true, 1);
	const String &hint_text = splits[0]; // Safe since `splits` cannot be empty.
	const String &hint_icon = splits.size() > 1 ? splits[1] : "Callable";

	Button *action_button = EditorInspector::create_inspector_action_button(hint_text);
	action_button->set_auto_translate_mode(Node::AUTO_TRANSLATE_MODE_DISABLED);
	action_button->set_disabled(p_usage & PROPERTY_USAGE_READ_ONLY);
	action_button->connect(SceneStringName(theme_changed), callable_mp(this, &EditorInspectorToolButtonPlugin::_update_action_icon).bind(action_button, hint_icon));
	action_button->connect(SceneStringName(pressed), callable_mp(this, &EditorInspectorToolButtonPlugin::_call_action).bind(p_object, p_path));

	add_custom_control(action_button);
	return true;
}

ToolButtonEditorPlugin::ToolButtonEditorPlugin() {
	Ref<EditorInspectorToolButtonPlugin> plugin;
	plugin.instantiate();
	add_inspector_plugin(plugin);
}