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godot/scene/gui/scroll_container.cpp

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/*************************************************************************/
/* scroll_container.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* 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: */
/* */
/* 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 */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "scroll_container.h"
#include "core/config/project_settings.h"
#include "core/os/os.h"
#include "scene/main/window.h"
Size2 ScrollContainer::get_minimum_size() const {
Ref<StyleBox> sb = get_theme_stylebox(SNAME("bg"));
Size2 min_size;
for (int i = 0; i < get_child_count(); i++) {
Control *c = Object::cast_to<Control>(get_child(i));
if (!c) {
continue;
}
if (c->is_set_as_top_level()) {
continue;
}
if (c == h_scroll || c == v_scroll) {
continue;
}
Size2 minsize = c->get_combined_minimum_size();
if (horizontal_scroll_mode == SCROLL_MODE_DISABLED) {
min_size.x = MAX(min_size.x, minsize.x);
}
if (vertical_scroll_mode == SCROLL_MODE_DISABLED) {
min_size.y = MAX(min_size.y, minsize.y);
}
}
if (h_scroll->is_visible_in_tree()) {
min_size.y += h_scroll->get_minimum_size().y;
}
if (v_scroll->is_visible_in_tree()) {
min_size.x += v_scroll->get_minimum_size().x;
}
min_size += sb->get_minimum_size();
return min_size;
}
void ScrollContainer::_cancel_drag() {
set_physics_process_internal(false);
drag_touching_deaccel = false;
drag_touching = false;
drag_speed = Vector2();
drag_accum = Vector2();
last_drag_accum = Vector2();
drag_from = Vector2();
if (beyond_deadzone) {
emit_signal(SNAME("scroll_ended"));
propagate_notification(NOTIFICATION_SCROLL_END);
beyond_deadzone = false;
}
}
void ScrollContainer::gui_input(const Ref<InputEvent> &p_gui_input) {
ERR_FAIL_COND(p_gui_input.is_null());
double prev_v_scroll = v_scroll->get_value();
double prev_h_scroll = h_scroll->get_value();
Ref<InputEventMouseButton> mb = p_gui_input;
if (mb.is_valid()) {
if (mb->get_button_index() == MouseButton::WHEEL_UP && mb->is_pressed()) {
// only horizontal is enabled, scroll horizontally
if (h_scroll->is_visible() && (!v_scroll->is_visible() || mb->is_shift_pressed())) {
h_scroll->set_value(h_scroll->get_value() - h_scroll->get_page() / 8 * mb->get_factor());
} else if (v_scroll->is_visible_in_tree()) {
v_scroll->set_value(v_scroll->get_value() - v_scroll->get_page() / 8 * mb->get_factor());
}
}
if (mb->get_button_index() == MouseButton::WHEEL_DOWN && mb->is_pressed()) {
// only horizontal is enabled, scroll horizontally
if (h_scroll->is_visible() && (!v_scroll->is_visible() || mb->is_shift_pressed())) {
h_scroll->set_value(h_scroll->get_value() + h_scroll->get_page() / 8 * mb->get_factor());
} else if (v_scroll->is_visible()) {
v_scroll->set_value(v_scroll->get_value() + v_scroll->get_page() / 8 * mb->get_factor());
}
}
if (mb->get_button_index() == MouseButton::WHEEL_LEFT && mb->is_pressed()) {
if (h_scroll->is_visible_in_tree()) {
h_scroll->set_value(h_scroll->get_value() - h_scroll->get_page() * mb->get_factor() / 8);
}
}
if (mb->get_button_index() == MouseButton::WHEEL_RIGHT && mb->is_pressed()) {
if (h_scroll->is_visible_in_tree()) {
h_scroll->set_value(h_scroll->get_value() + h_scroll->get_page() * mb->get_factor() / 8);
}
}
if (v_scroll->get_value() != prev_v_scroll || h_scroll->get_value() != prev_h_scroll) {
accept_event(); //accept event if scroll changed
}
if (!DisplayServer::get_singleton()->screen_is_touchscreen(DisplayServer::get_singleton()->window_get_current_screen(get_viewport()->get_window_id()))) {
return;
}
if (mb->get_button_index() != MouseButton::LEFT) {
return;
}
if (mb->is_pressed()) {
if (drag_touching) {
_cancel_drag();
}
drag_speed = Vector2();
drag_accum = Vector2();
last_drag_accum = Vector2();
drag_from = Vector2(h_scroll->get_value(), v_scroll->get_value());
drag_touching = !DisplayServer::get_singleton()->screen_is_touchscreen(DisplayServer::get_singleton()->window_get_current_screen(get_viewport()->get_window_id()));
drag_touching_deaccel = false;
beyond_deadzone = false;
time_since_motion = 0;
if (drag_touching) {
set_physics_process_internal(true);
time_since_motion = 0;
}
} else {
if (drag_touching) {
if (drag_speed == Vector2()) {
_cancel_drag();
} else {
drag_touching_deaccel = true;
}
}
}
}
Ref<InputEventMouseMotion> mm = p_gui_input;
if (mm.is_valid()) {
if (drag_touching && !drag_touching_deaccel) {
Vector2 motion = mm->get_relative();
drag_accum -= motion;
if (beyond_deadzone || (horizontal_scroll_mode != SCROLL_MODE_DISABLED && Math::abs(drag_accum.x) > deadzone) || (vertical_scroll_mode != SCROLL_MODE_DISABLED && Math::abs(drag_accum.y) > deadzone)) {
if (!beyond_deadzone) {
propagate_notification(NOTIFICATION_SCROLL_BEGIN);
emit_signal(SNAME("scroll_started"));
beyond_deadzone = true;
// resetting drag_accum here ensures smooth scrolling after reaching deadzone
drag_accum = -motion;
}
Vector2 diff = drag_from + drag_accum;
if (horizontal_scroll_mode != SCROLL_MODE_DISABLED) {
h_scroll->set_value(diff.x);
} else {
drag_accum.x = 0;
}
if (vertical_scroll_mode != SCROLL_MODE_DISABLED) {
v_scroll->set_value(diff.y);
} else {
drag_accum.y = 0;
}
time_since_motion = 0;
}
}
}
Ref<InputEventPanGesture> pan_gesture = p_gui_input;
if (pan_gesture.is_valid()) {
if (h_scroll->is_visible_in_tree()) {
h_scroll->set_value(h_scroll->get_value() + h_scroll->get_page() * pan_gesture->get_delta().x / 8);
}
if (v_scroll->is_visible_in_tree()) {
v_scroll->set_value(v_scroll->get_value() + v_scroll->get_page() * pan_gesture->get_delta().y / 8);
}
}
if (v_scroll->get_value() != prev_v_scroll || h_scroll->get_value() != prev_h_scroll) {
accept_event(); //accept event if scroll changed
}
}
void ScrollContainer::_update_scrollbar_position() {
if (!_updating_scrollbars) {
return;
}
Size2 hmin = h_scroll->get_combined_minimum_size();
Size2 vmin = v_scroll->get_combined_minimum_size();
h_scroll->set_anchor_and_offset(SIDE_LEFT, ANCHOR_BEGIN, 0);
h_scroll->set_anchor_and_offset(SIDE_RIGHT, ANCHOR_END, 0);
h_scroll->set_anchor_and_offset(SIDE_TOP, ANCHOR_END, -hmin.height);
h_scroll->set_anchor_and_offset(SIDE_BOTTOM, ANCHOR_END, 0);
v_scroll->set_anchor_and_offset(SIDE_LEFT, ANCHOR_END, -vmin.width);
v_scroll->set_anchor_and_offset(SIDE_RIGHT, ANCHOR_END, 0);
v_scroll->set_anchor_and_offset(SIDE_TOP, ANCHOR_BEGIN, 0);
v_scroll->set_anchor_and_offset(SIDE_BOTTOM, ANCHOR_END, 0);
_updating_scrollbars = false;
}
void ScrollContainer::_gui_focus_changed(Control *p_control) {
if (follow_focus && is_ancestor_of(p_control)) {
ensure_control_visible(p_control);
}
}
void ScrollContainer::ensure_control_visible(Control *p_control) {
ERR_FAIL_COND_MSG(!is_ancestor_of(p_control), "Must be an ancestor of the control.");
Rect2 global_rect = get_global_rect();
Rect2 other_rect = p_control->get_global_rect();
float right_margin = v_scroll->is_visible() ? v_scroll->get_size().x : 0.0f;
float bottom_margin = h_scroll->is_visible() ? h_scroll->get_size().y : 0.0f;
Vector2 diff = Vector2(MAX(MIN(other_rect.position.x, global_rect.position.x), other_rect.position.x + other_rect.size.x - global_rect.size.x + (!is_layout_rtl() ? right_margin : 0.0f)),
MAX(MIN(other_rect.position.y, global_rect.position.y), other_rect.position.y + other_rect.size.y - global_rect.size.y + bottom_margin));
set_h_scroll(get_h_scroll() + (diff.x - global_rect.position.x));
set_v_scroll(get_v_scroll() + (diff.y - global_rect.position.y));
}
void ScrollContainer::_update_dimensions() {
child_max_size = Size2(0, 0);
Size2 size = get_size();
Point2 ofs;
Ref<StyleBox> sb = get_theme_stylebox(SNAME("bg"));
size -= sb->get_minimum_size();
ofs += sb->get_offset();
bool rtl = is_layout_rtl();
if (h_scroll->is_visible_in_tree() && h_scroll->get_parent() == this) { //scrolls may have been moved out for reasons
size.y -= h_scroll->get_minimum_size().y;
}
if (v_scroll->is_visible_in_tree() && v_scroll->get_parent() == this) { //scrolls may have been moved out for reasons
size.x -= v_scroll->get_minimum_size().x;
}
for (int i = 0; i < get_child_count(); i++) {
Control *c = Object::cast_to<Control>(get_child(i));
if (!c) {
continue;
}
if (c->is_set_as_top_level()) {
continue;
}
if (c == h_scroll || c == v_scroll) {
continue;
}
Size2 minsize = c->get_combined_minimum_size();
child_max_size.x = MAX(child_max_size.x, minsize.x);
child_max_size.y = MAX(child_max_size.y, minsize.y);
Rect2 r = Rect2(-Size2(get_h_scroll(), get_v_scroll()), minsize);
if (horizontal_scroll_mode == SCROLL_MODE_DISABLED || (!h_scroll->is_visible_in_tree() && c->get_h_size_flags() & SIZE_EXPAND)) {
r.position.x = 0;
if (c->get_h_size_flags() & SIZE_EXPAND) {
r.size.width = MAX(size.width, minsize.width);
} else {
r.size.width = minsize.width;
}
}
if (vertical_scroll_mode == SCROLL_MODE_DISABLED || (!v_scroll->is_visible_in_tree() && c->get_v_size_flags() & SIZE_EXPAND)) {
r.position.y = 0;
if (c->get_v_size_flags() & SIZE_EXPAND) {
r.size.height = MAX(size.height, minsize.height);
} else {
r.size.height = minsize.height;
}
}
r.position += ofs;
if (rtl && v_scroll->is_visible_in_tree() && v_scroll->get_parent() == this) {
r.position.x += v_scroll->get_minimum_size().x;
}
r.position = r.position.floor();
fit_child_in_rect(c, r);
}
update();
}
void ScrollContainer::_notification(int p_what) {
switch (p_what) {
case NOTIFICATION_ENTER_TREE:
case NOTIFICATION_THEME_CHANGED:
case NOTIFICATION_LAYOUT_DIRECTION_CHANGED:
case NOTIFICATION_TRANSLATION_CHANGED: {
_updating_scrollbars = true;
call_deferred(SNAME("_update_scrollbar_position"));
} break;
case NOTIFICATION_READY: {
Viewport *viewport = get_viewport();
ERR_FAIL_COND(!viewport);
viewport->connect("gui_focus_changed", callable_mp(this, &ScrollContainer::_gui_focus_changed));
_update_dimensions();
} break;
case NOTIFICATION_SORT_CHILDREN: {
_update_dimensions();
} break;
case NOTIFICATION_DRAW: {
Ref<StyleBox> sb = get_theme_stylebox(SNAME("bg"));
draw_style_box(sb, Rect2(Vector2(), get_size()));
update_scrollbars();
} break;
case NOTIFICATION_INTERNAL_PHYSICS_PROCESS: {
if (drag_touching) {
if (drag_touching_deaccel) {
Vector2 pos = Vector2(h_scroll->get_value(), v_scroll->get_value());
pos += drag_speed * get_physics_process_delta_time();
bool turnoff_h = false;
bool turnoff_v = false;
if (pos.x < 0) {
pos.x = 0;
turnoff_h = true;
}
if (pos.x > (h_scroll->get_max() - h_scroll->get_page())) {
pos.x = h_scroll->get_max() - h_scroll->get_page();
turnoff_h = true;
}
if (pos.y < 0) {
pos.y = 0;
turnoff_v = true;
}
if (pos.y > (v_scroll->get_max() - v_scroll->get_page())) {
pos.y = v_scroll->get_max() - v_scroll->get_page();
turnoff_v = true;
}
if (horizontal_scroll_mode != SCROLL_MODE_DISABLED) {
h_scroll->set_value(pos.x);
}
if (vertical_scroll_mode != SCROLL_MODE_DISABLED) {
v_scroll->set_value(pos.y);
}
float sgn_x = drag_speed.x < 0 ? -1 : 1;
float val_x = Math::abs(drag_speed.x);
val_x -= 1000 * get_physics_process_delta_time();
if (val_x < 0) {
turnoff_h = true;
}
float sgn_y = drag_speed.y < 0 ? -1 : 1;
float val_y = Math::abs(drag_speed.y);
val_y -= 1000 * get_physics_process_delta_time();
if (val_y < 0) {
turnoff_v = true;
}
drag_speed = Vector2(sgn_x * val_x, sgn_y * val_y);
if (turnoff_h && turnoff_v) {
_cancel_drag();
}
} else {
if (time_since_motion == 0 || time_since_motion > 0.1) {
Vector2 diff = drag_accum - last_drag_accum;
last_drag_accum = drag_accum;
drag_speed = diff / get_physics_process_delta_time();
}
time_since_motion += get_physics_process_delta_time();
}
}
} break;
}
}
void ScrollContainer::update_scrollbars() {
Size2 size = get_size();
Ref<StyleBox> sb = get_theme_stylebox(SNAME("bg"));
size -= sb->get_minimum_size();
Size2 hmin;
Size2 vmin;
if (horizontal_scroll_mode != SCROLL_MODE_DISABLED) {
hmin = h_scroll->get_combined_minimum_size();
}
if (vertical_scroll_mode != SCROLL_MODE_DISABLED) {
vmin = v_scroll->get_combined_minimum_size();
}
Size2 min = child_max_size;
bool hide_scroll_h = horizontal_scroll_mode != SCROLL_MODE_SHOW_ALWAYS && (horizontal_scroll_mode == SCROLL_MODE_DISABLED || horizontal_scroll_mode == SCROLL_MODE_SHOW_NEVER || (horizontal_scroll_mode == SCROLL_MODE_AUTO && min.width <= size.width));
bool hide_scroll_v = vertical_scroll_mode != SCROLL_MODE_SHOW_ALWAYS && (vertical_scroll_mode == SCROLL_MODE_DISABLED || vertical_scroll_mode == SCROLL_MODE_SHOW_NEVER || (vertical_scroll_mode == SCROLL_MODE_AUTO && min.height <= size.height));
h_scroll->set_max(min.width);
h_scroll->set_page(size.width - (hide_scroll_v ? 0 : vmin.width));
h_scroll->set_visible(!hide_scroll_h);
v_scroll->set_max(min.height);
v_scroll->set_page(size.height - (hide_scroll_h ? 0 : hmin.height));
v_scroll->set_visible(!hide_scroll_v);
// Avoid scrollbar overlapping.
h_scroll->set_anchor_and_offset(SIDE_RIGHT, ANCHOR_END, hide_scroll_v ? 0 : -vmin.width);
v_scroll->set_anchor_and_offset(SIDE_BOTTOM, ANCHOR_END, hide_scroll_h ? 0 : -hmin.height);
}
void ScrollContainer::_scroll_moved(float) {
queue_sort();
update();
};
void ScrollContainer::set_h_scroll(int p_pos) {
h_scroll->set_value(p_pos);
_cancel_drag();
}
int ScrollContainer::get_h_scroll() const {
return h_scroll->get_value();
}
void ScrollContainer::set_v_scroll(int p_pos) {
v_scroll->set_value(p_pos);
_cancel_drag();
}
int ScrollContainer::get_v_scroll() const {
return v_scroll->get_value();
}
void ScrollContainer::set_horizontal_scroll_mode(ScrollMode p_mode) {
if (horizontal_scroll_mode == p_mode) {
return;
}
horizontal_scroll_mode = p_mode;
update_minimum_size();
queue_sort();
}
ScrollContainer::ScrollMode ScrollContainer::get_horizontal_scroll_mode() const {
return horizontal_scroll_mode;
}
void ScrollContainer::set_vertical_scroll_mode(ScrollMode p_mode) {
if (vertical_scroll_mode == p_mode) {
return;
}
vertical_scroll_mode = p_mode;
update_minimum_size();
queue_sort();
}
ScrollContainer::ScrollMode ScrollContainer::get_vertical_scroll_mode() const {
return vertical_scroll_mode;
}
int ScrollContainer::get_deadzone() const {
return deadzone;
}
void ScrollContainer::set_deadzone(int p_deadzone) {
deadzone = p_deadzone;
}
bool ScrollContainer::is_following_focus() const {
return follow_focus;
}
void ScrollContainer::set_follow_focus(bool p_follow) {
follow_focus = p_follow;
}
TypedArray<String> ScrollContainer::get_configuration_warnings() const {
TypedArray<String> warnings = Container::get_configuration_warnings();
int found = 0;
for (int i = 0; i < get_child_count(); i++) {
Control *c = Object::cast_to<Control>(get_child(i));
if (!c) {
continue;
}
if (c->is_set_as_top_level()) {
continue;
}
if (c == h_scroll || c == v_scroll) {
continue;
}
found++;
}
if (found != 1) {
warnings.push_back(RTR("ScrollContainer is intended to work with a single child control.\nUse a container as child (VBox, HBox, etc.), or a Control and set the custom minimum size manually."));
}
return warnings;
}
HScrollBar *ScrollContainer::get_h_scroll_bar() {
return h_scroll;
}
VScrollBar *ScrollContainer::get_v_scroll_bar() {
return v_scroll;
}
void ScrollContainer::_bind_methods() {
ClassDB::bind_method(D_METHOD("_update_scrollbar_position"), &ScrollContainer::_update_scrollbar_position);
ClassDB::bind_method(D_METHOD("set_h_scroll", "value"), &ScrollContainer::set_h_scroll);
ClassDB::bind_method(D_METHOD("get_h_scroll"), &ScrollContainer::get_h_scroll);
ClassDB::bind_method(D_METHOD("set_v_scroll", "value"), &ScrollContainer::set_v_scroll);
ClassDB::bind_method(D_METHOD("get_v_scroll"), &ScrollContainer::get_v_scroll);
ClassDB::bind_method(D_METHOD("set_horizontal_scroll_mode", "enable"), &ScrollContainer::set_horizontal_scroll_mode);
ClassDB::bind_method(D_METHOD("get_horizontal_scroll_mode"), &ScrollContainer::get_horizontal_scroll_mode);
ClassDB::bind_method(D_METHOD("set_vertical_scroll_mode", "enable"), &ScrollContainer::set_vertical_scroll_mode);
ClassDB::bind_method(D_METHOD("get_vertical_scroll_mode"), &ScrollContainer::get_vertical_scroll_mode);
ClassDB::bind_method(D_METHOD("set_deadzone", "deadzone"), &ScrollContainer::set_deadzone);
ClassDB::bind_method(D_METHOD("get_deadzone"), &ScrollContainer::get_deadzone);
ClassDB::bind_method(D_METHOD("set_follow_focus", "enabled"), &ScrollContainer::set_follow_focus);
ClassDB::bind_method(D_METHOD("is_following_focus"), &ScrollContainer::is_following_focus);
ClassDB::bind_method(D_METHOD("get_h_scroll_bar"), &ScrollContainer::get_h_scroll_bar);
ClassDB::bind_method(D_METHOD("get_v_scroll_bar"), &ScrollContainer::get_v_scroll_bar);
ClassDB::bind_method(D_METHOD("ensure_control_visible", "control"), &ScrollContainer::ensure_control_visible);
ADD_SIGNAL(MethodInfo("scroll_started"));
ADD_SIGNAL(MethodInfo("scroll_ended"));
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "follow_focus"), "set_follow_focus", "is_following_focus");
ADD_GROUP("Scroll", "scroll_");
ADD_PROPERTY(PropertyInfo(Variant::INT, "scroll_horizontal"), "set_h_scroll", "get_h_scroll");
ADD_PROPERTY(PropertyInfo(Variant::INT, "scroll_vertical"), "set_v_scroll", "get_v_scroll");
ADD_PROPERTY(PropertyInfo(Variant::INT, "horizontal_scroll_mode", PROPERTY_HINT_ENUM, "Disabled,Auto,Always Show,Never Show"), "set_horizontal_scroll_mode", "get_horizontal_scroll_mode");
ADD_PROPERTY(PropertyInfo(Variant::INT, "vertical_scroll_mode", PROPERTY_HINT_ENUM, "Disabled,Auto,Always Show,Never Show"), "set_vertical_scroll_mode", "get_vertical_scroll_mode");
ADD_PROPERTY(PropertyInfo(Variant::INT, "scroll_deadzone"), "set_deadzone", "get_deadzone");
BIND_ENUM_CONSTANT(SCROLL_MODE_DISABLED);
BIND_ENUM_CONSTANT(SCROLL_MODE_AUTO);
BIND_ENUM_CONSTANT(SCROLL_MODE_SHOW_ALWAYS);
BIND_ENUM_CONSTANT(SCROLL_MODE_SHOW_NEVER);
GLOBAL_DEF("gui/common/default_scroll_deadzone", 0);
};
ScrollContainer::ScrollContainer() {
h_scroll = memnew(HScrollBar);
h_scroll->set_name("_h_scroll");
add_child(h_scroll, false, INTERNAL_MODE_BACK);
h_scroll->connect("value_changed", callable_mp(this, &ScrollContainer::_scroll_moved));
v_scroll = memnew(VScrollBar);
v_scroll->set_name("_v_scroll");
add_child(v_scroll, false, INTERNAL_MODE_BACK);
v_scroll->connect("value_changed", callable_mp(this, &ScrollContainer::_scroll_moved));
deadzone = GLOBAL_GET("gui/common/default_scroll_deadzone");
set_clip_contents(true);
};
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