godot/editor/gui/editor_title_bar.cpp

/**************************************************************************/
/*  editor_title_bar.cpp                                                  */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
/*                                                                        */
/* Permission is hereby granted, free of charge, to any person obtaining  */
/* a copy of this software and associated documentation files (the        */
/* "Software"), to deal in the Software without restriction, including    */
/* without limitation the rights to use, copy, modify, merge, publish,    */
/* distribute, sublicense, and/or sell copies of the Software, and to     */
/* permit persons to whom the Software is furnished to do so, subject to  */
/* the following conditions:                                              */
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/* The above copyright notice and this permission notice shall be         */
/* included in all copies or substantial portions of the Software.        */
/*                                                                        */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
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/**************************************************************************/

#include "editor_title_bar.h"

void EditorTitleBar::gui_input(const Ref<InputEvent> &p_event) {
	if (!can_move) {
		return;
	}

	Ref<InputEventMouseMotion> mm = p_event;
	if (mm.is_valid() && moving) {
		if (mm->get_button_mask().has_flag(MouseButtonMask::LEFT)) {
			Window *w = Object::cast_to<Window>(get_viewport());
			if (w) {
				Point2 mouse = DisplayServer::get_singleton()->mouse_get_position();
				w->set_position(mouse - click_pos);
			}
		} else {
			moving = false;
		}
	}

	Ref<InputEventMouseButton> mb = p_event;
	if (mb.is_valid() && has_point(mb->get_position())) {
		Window *w = Object::cast_to<Window>(get_viewport());
		if (w) {
			if (mb->get_button_index() == MouseButton::LEFT) {
				if (mb->is_pressed()) {
					if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_WINDOW_DRAG)) {
						DisplayServer::get_singleton()->window_start_drag(w->get_window_id());
					} else {
						click_pos = DisplayServer::get_singleton()->mouse_get_position() - w->get_position();
						moving = true;
					}
				} else {
					moving = false;
				}
			}
			if (mb->get_button_index() == MouseButton::LEFT && mb->is_double_click() && mb->is_pressed()) {
				if (DisplayServer::get_singleton()->window_maximize_on_title_dbl_click()) {
					if (w->get_mode() == Window::MODE_WINDOWED) {
						w->set_mode(Window::MODE_MAXIMIZED);
					} else if (w->get_mode() == Window::MODE_MAXIMIZED) {
						w->set_mode(Window::MODE_WINDOWED);
					}
				} else if (DisplayServer::get_singleton()->window_minimize_on_title_dbl_click()) {
					w->set_mode(Window::MODE_MINIMIZED);
				}
				moving = false;
			}
		}
	}
}

void EditorTitleBar::set_center_control(Control *p_center_control) {
	center_control = p_center_control;
}

Control *EditorTitleBar::get_center_control() const {
	return center_control;
}

void EditorTitleBar::_notification(int p_what) {
	if (!center_control || p_what != NOTIFICATION_SORT_CHILDREN) {
		return;
	}

	Control *prev = nullptr;
	Control *base = nullptr;
	Control *next = nullptr;

	bool rtl = is_layout_rtl();

	int start;
	int end;
	int delta;
	if (rtl) {
		start = get_child_count() - 1;
		end = -1;
		delta = -1;
	} else {
		start = 0;
		end = get_child_count();
		delta = +1;
	}

	for (int i = start; i != end; i += delta) {
		Control *c = as_sortable_control(get_child(i));
		if (!c) {
			continue;
		}
		if (base) {
			next = c;
			break;
		}
		if (c != center_control) {
			prev = c;
			continue;
		}
		base = c;
	}
	if (base && prev && next) {
		Size2i title_size = get_size();
		Size2i c_size = base->get_combined_minimum_size();

		int min_offset = prev->get_position().x + prev->get_combined_minimum_size().x;
		int max_offset = next->get_position().x + next->get_size().x - next->get_combined_minimum_size().x - c_size.x;

		int offset = (title_size.width - c_size.width) / 2;
		offset = CLAMP(offset, min_offset, max_offset);

		fit_child_in_rect(prev, Rect2i(prev->get_position().x, 0, offset - prev->get_position().x, title_size.height));
		fit_child_in_rect(base, Rect2i(offset, 0, c_size.width, title_size.height));
		fit_child_in_rect(next, Rect2i(offset + c_size.width, 0, next->get_position().x + next->get_size().x - (offset + c_size.width), title_size.height));
	}
}

void EditorTitleBar::set_can_move_window(bool p_enabled) {
	can_move = p_enabled;
	set_process_input(can_move);
}

bool EditorTitleBar::get_can_move_window() const {
	return can_move;
}