godot/scene/gui/menu_button.cpp

/*************************************************************************/
/*  menu_button.cpp                                                      */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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#include "menu_button.h"
#include "os/keyboard.h"
#include "scene/main/viewport.h"

void MenuButton::_unhandled_key_input(Ref<InputEvent> p_event) {

	if (disable_shortcuts)
		return;

	if (p_event->is_pressed() && !p_event->is_echo() && (Object::cast_to<InputEventKey>(p_event.ptr()) || Object::cast_to<InputEventJoypadButton>(p_event.ptr()) || Object::cast_to<InputEventAction>(*p_event))) {

		if (!get_parent() || !is_visible_in_tree() || is_disabled())
			return;

		bool global_only = (get_viewport()->get_modal_stack_top() && !get_viewport()->get_modal_stack_top()->is_a_parent_of(this));

		if (popup->activate_item_by_event(p_event, global_only))
			accept_event();
	}
}

void MenuButton::pressed() {

	emit_signal("about_to_show");
	Size2 size = get_size();

	Point2 gp = get_global_position();
	popup->set_global_position(gp + Size2(0, size.height));
	popup->set_size(Size2(size.width, 0));
	popup->set_parent_rect(Rect2(Point2(gp - popup->get_global_position()), get_size()));
	popup->popup();
	popup->set_invalidate_click_until_motion();
}

void MenuButton::_gui_input(Ref<InputEvent> p_event) {

	BaseButton::_gui_input(p_event);
}

PopupMenu *MenuButton::get_popup() const {

	return popup;
}

Array MenuButton::_get_items() const {

	return popup->get("items");
}
void MenuButton::_set_items(const Array &p_items) {

	popup->set("items", p_items);
}

void MenuButton::_bind_methods() {

	ClassDB::bind_method(D_METHOD("get_popup"), &MenuButton::get_popup);
	ClassDB::bind_method(D_METHOD("_unhandled_key_input"), &MenuButton::_unhandled_key_input);
	ClassDB::bind_method(D_METHOD("_set_items"), &MenuButton::_set_items);
	ClassDB::bind_method(D_METHOD("_get_items"), &MenuButton::_get_items);
	ClassDB::bind_method(D_METHOD("set_disable_shortcuts", "disabled"), &MenuButton::set_disable_shortcuts);

	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "items", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NOEDITOR), "_set_items", "_get_items");

	ADD_SIGNAL(MethodInfo("about_to_show"));
}

void MenuButton::set_disable_shortcuts(bool p_disabled) {

	disable_shortcuts = p_disabled;
}

MenuButton::MenuButton() {

	set_flat(true);
	set_disable_shortcuts(false);
	set_enabled_focus_mode(FOCUS_NONE);
	popup = memnew(PopupMenu);
	popup->hide();
	add_child(popup);
	popup->set_as_toplevel(true);
	popup->set_pass_on_modal_close_click(false);
	connect("button_up", popup, "call_deferred", make_binds("grab_click_focus"));
	set_process_unhandled_key_input(true);
	set_action_mode(ACTION_MODE_BUTTON_PRESS);
}

MenuButton::~MenuButton() {
}