godot/scene/theme/theme_owner.cpp

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/**************************************************************************/
/* theme_owner.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* 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: */
/* */
/* 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 "theme_owner.h"
#include "scene/gui/control.h"
#include "scene/main/window.h"
#include "scene/theme/theme_db.h"
// Theme owner node.
void ThemeOwner::set_owner_node(Node *p_node) {
owner_control = nullptr;
owner_window = nullptr;
Control *c = Object::cast_to<Control>(p_node);
if (c) {
owner_control = c;
return;
}
Window *w = Object::cast_to<Window>(p_node);
if (w) {
owner_window = w;
return;
}
}
Node *ThemeOwner::get_owner_node() const {
if (owner_control) {
return owner_control;
} else if (owner_window) {
return owner_window;
}
return nullptr;
}
bool ThemeOwner::has_owner_node() const {
return bool(owner_control || owner_window);
}
void ThemeOwner::set_owner_context(ThemeContext *p_context, bool p_propagate) {
ThemeContext *default_context = ThemeDB::get_singleton()->get_default_theme_context();
if (owner_context && owner_context->is_connected(CoreStringName(changed), callable_mp(this, &ThemeOwner::_owner_context_changed))) {
owner_context->disconnect(CoreStringName(changed), callable_mp(this, &ThemeOwner::_owner_context_changed));
} else if (default_context->is_connected(CoreStringName(changed), callable_mp(this, &ThemeOwner::_owner_context_changed))) {
default_context->disconnect(CoreStringName(changed), callable_mp(this, &ThemeOwner::_owner_context_changed));
}
owner_context = p_context;
if (owner_context) {
owner_context->connect(CoreStringName(changed), callable_mp(this, &ThemeOwner::_owner_context_changed));
} else {
default_context->connect(CoreStringName(changed), callable_mp(this, &ThemeOwner::_owner_context_changed));
}
if (p_propagate) {
_owner_context_changed();
}
}
void ThemeOwner::_owner_context_changed() {
if (!holder->is_inside_tree()) {
// We ignore theme changes outside of tree, because NOTIFICATION_ENTER_TREE covers everything.
return;
}
Control *c = Object::cast_to<Control>(holder);
Window *w = c == nullptr ? Object::cast_to<Window>(holder) : nullptr;
if (c) {
c->notification(Control::NOTIFICATION_THEME_CHANGED);
} else if (w) {
w->notification(Window::NOTIFICATION_THEME_CHANGED);
}
}
ThemeContext *ThemeOwner::_get_active_owner_context() const {
if (owner_context) {
return owner_context;
}
return ThemeDB::get_singleton()->get_default_theme_context();
}
// Theme propagation.
void ThemeOwner::assign_theme_on_parented(Node *p_for_node) {
// We check if there are any themes affecting the parent. If that's the case
// its children also need to be affected.
// We don't notify here because `NOTIFICATION_THEME_CHANGED` will be handled
// a bit later by `NOTIFICATION_ENTER_TREE`.
Node *parent = p_for_node->get_parent();
Control *parent_c = Object::cast_to<Control>(parent);
if (parent_c && parent_c->has_theme_owner_node()) {
propagate_theme_changed(p_for_node, parent_c->get_theme_owner_node(), false, true);
} else {
Window *parent_w = Object::cast_to<Window>(parent);
if (parent_w && parent_w->has_theme_owner_node()) {
propagate_theme_changed(p_for_node, parent_w->get_theme_owner_node(), false, true);
}
}
}
void ThemeOwner::clear_theme_on_unparented(Node *p_for_node) {
// We check if there were any themes affecting the parent. If that's the case
// its children need were also affected and need to be updated.
// We don't notify because we're exiting the tree, and it's not important.
Node *parent = p_for_node->get_parent();
Control *parent_c = Object::cast_to<Control>(parent);
if (parent_c && parent_c->has_theme_owner_node()) {
propagate_theme_changed(p_for_node, nullptr, false, true);
} else {
Window *parent_w = Object::cast_to<Window>(parent);
if (parent_w && parent_w->has_theme_owner_node()) {
propagate_theme_changed(p_for_node, nullptr, false, true);
}
}
}
void ThemeOwner::propagate_theme_changed(Node *p_to_node, Node *p_owner_node, bool p_notify, bool p_assign) {
Control *c = Object::cast_to<Control>(p_to_node);
Window *w = c == nullptr ? Object::cast_to<Window>(p_to_node) : nullptr;
if (!c && !w) {
// Theme inheritance chains are broken by nodes that aren't Control or Window.
return;
}
bool assign = p_assign;
if (c) {
if (c != p_owner_node && c->get_theme().is_valid()) {
// Has a theme, so we don't want to change the theme owner,
// but we still want to propagate in case this child has theme items
// it inherits from the theme this node uses.
// See https://github.com/godotengine/godot/issues/62844.
assign = false;
}
if (assign) {
c->set_theme_owner_node(p_owner_node);
}
if (p_notify) {
c->notification(Control::NOTIFICATION_THEME_CHANGED);
}
} else if (w) {
if (w != p_owner_node && w->get_theme().is_valid()) {
// Same as above.
assign = false;
}
if (assign) {
w->set_theme_owner_node(p_owner_node);
}
if (p_notify) {
w->notification(Window::NOTIFICATION_THEME_CHANGED);
}
}
for (int i = 0; i < p_to_node->get_child_count(); i++) {
propagate_theme_changed(p_to_node->get_child(i), p_owner_node, p_notify, assign);
}
}
// Theme lookup.
void ThemeOwner::get_theme_type_dependencies(const Node *p_for_node, const StringName &p_theme_type, List<StringName> *r_list) const {
const Control *for_c = Object::cast_to<Control>(p_for_node);
const Window *for_w = Object::cast_to<Window>(p_for_node);
ERR_FAIL_COND_MSG(!for_c && !for_w, "Only Control and Window nodes and derivatives can be polled for theming.");
StringName type_name = p_for_node->get_class_name();
StringName type_variation;
if (for_c) {
type_variation = for_c->get_theme_type_variation();
} else if (for_w) {
type_variation = for_w->get_theme_type_variation();
}
// If we are looking for dependencies of the current class (or a variation of it), check relevant themes.
if (p_theme_type == StringName() || p_theme_type == type_name || p_theme_type == type_variation) {
// We need one theme that can give us a valid dependency chain. It must be complete
// (i.e. variations can depend on other variations, but only within the same theme,
// and eventually the chain must lead to native types).
// First, look through themes owned by nodes in the tree.
Node *owner_node = get_owner_node();
while (owner_node) {
Ref<Theme> owner_theme = _get_owner_node_theme(owner_node);
if (owner_theme.is_valid() && owner_theme->get_type_variation_base(type_variation) != StringName()) {
owner_theme->get_type_dependencies(type_name, type_variation, r_list);
return;
}
owner_node = _get_next_owner_node(owner_node);
}
// Second, check global contexts.
ThemeContext *global_context = _get_active_owner_context();
for (const Ref<Theme> &theme : global_context->get_themes()) {
if (theme.is_valid() && theme->get_type_variation_base(type_variation) != StringName()) {
theme->get_type_dependencies(type_name, type_variation, r_list);
return;
}
}
// If nothing was found, get the native dependencies for the current class.
ThemeDB::get_singleton()->get_native_type_dependencies(type_name, r_list);
return;
}
// Otherwise, get the native dependencies for the provided theme type.
ThemeDB::get_singleton()->get_native_type_dependencies(p_theme_type, r_list);
}
Variant ThemeOwner::get_theme_item_in_types(Theme::DataType p_data_type, const StringName &p_name, const List<StringName> &p_theme_types) {
ERR_FAIL_COND_V_MSG(p_theme_types.is_empty(), Variant(), "At least one theme type must be specified.");
// First, look through each control or window node in the branch, until no valid parent can be found.
// Only nodes with a theme resource attached are considered.
Node *owner_node = get_owner_node();
while (owner_node) {
// For each theme resource check the theme types provided and see if p_name exists with any of them.
for (const StringName &E : p_theme_types) {
Ref<Theme> owner_theme = _get_owner_node_theme(owner_node);
if (owner_theme.is_valid() && owner_theme->has_theme_item(p_data_type, p_name, E)) {
return owner_theme->get_theme_item(p_data_type, p_name, E);
}
}
owner_node = _get_next_owner_node(owner_node);
}
// Second, check global themes from the appropriate context.
ThemeContext *global_context = _get_active_owner_context();
for (const Ref<Theme> &theme : global_context->get_themes()) {
if (theme.is_valid()) {
for (const StringName &E : p_theme_types) {
if (theme->has_theme_item(p_data_type, p_name, E)) {
return theme->get_theme_item(p_data_type, p_name, E);
}
}
}
}
// Finally, if no match exists, use any type to return the default/empty value.
return global_context->get_fallback_theme()->get_theme_item(p_data_type, p_name, StringName());
}
bool ThemeOwner::has_theme_item_in_types(Theme::DataType p_data_type, const StringName &p_name, const List<StringName> &p_theme_types) {
ERR_FAIL_COND_V_MSG(p_theme_types.is_empty(), false, "At least one theme type must be specified.");
// First, look through each control or window node in the branch, until no valid parent can be found.
// Only nodes with a theme resource attached are considered.
Node *owner_node = get_owner_node();
while (owner_node) {
// For each theme resource check the theme types provided and see if p_name exists with any of them.
for (const StringName &E : p_theme_types) {
Ref<Theme> owner_theme = _get_owner_node_theme(owner_node);
if (owner_theme.is_valid() && owner_theme->has_theme_item(p_data_type, p_name, E)) {
return true;
}
}
owner_node = _get_next_owner_node(owner_node);
}
// Second, check global themes from the appropriate context.
ThemeContext *global_context = _get_active_owner_context();
for (const Ref<Theme> &theme : global_context->get_themes()) {
if (theme.is_valid()) {
for (const StringName &E : p_theme_types) {
if (theme->has_theme_item(p_data_type, p_name, E)) {
return true;
}
}
}
}
// Finally, if no match exists, return false.
return false;
}
float ThemeOwner::get_theme_default_base_scale() {
// First, look through each control or window node in the branch, until no valid parent can be found.
// Only nodes with a theme resource attached are considered.
// For each theme resource see if their assigned theme has the default value defined and valid.
Node *owner_node = get_owner_node();
while (owner_node) {
Ref<Theme> owner_theme = _get_owner_node_theme(owner_node);
if (owner_theme.is_valid() && owner_theme->has_default_base_scale()) {
return owner_theme->get_default_base_scale();
}
owner_node = _get_next_owner_node(owner_node);
}
// Second, check global themes from the appropriate context.
ThemeContext *global_context = _get_active_owner_context();
for (const Ref<Theme> &theme : global_context->get_themes()) {
if (theme.is_valid()) {
if (theme->has_default_base_scale()) {
return theme->get_default_base_scale();
}
}
}
// Finally, if no match exists, return the universal default.
return ThemeDB::get_singleton()->get_fallback_base_scale();
}
Ref<Font> ThemeOwner::get_theme_default_font() {
// First, look through each control or window node in the branch, until no valid parent can be found.
// Only nodes with a theme resource attached are considered.
// For each theme resource see if their assigned theme has the default value defined and valid.
Node *owner_node = get_owner_node();
while (owner_node) {
Ref<Theme> owner_theme = _get_owner_node_theme(owner_node);
if (owner_theme.is_valid() && owner_theme->has_default_font()) {
return owner_theme->get_default_font();
}
owner_node = _get_next_owner_node(owner_node);
}
// Second, check global themes from the appropriate context.
ThemeContext *global_context = _get_active_owner_context();
for (const Ref<Theme> &theme : global_context->get_themes()) {
if (theme.is_valid()) {
if (theme->has_default_font()) {
return theme->get_default_font();
}
}
}
// Finally, if no match exists, return the universal default.
return ThemeDB::get_singleton()->get_fallback_font();
}
int ThemeOwner::get_theme_default_font_size() {
// First, look through each control or window node in the branch, until no valid parent can be found.
// Only nodes with a theme resource attached are considered.
// For each theme resource see if their assigned theme has the default value defined and valid.
Node *owner_node = get_owner_node();
while (owner_node) {
Ref<Theme> owner_theme = _get_owner_node_theme(owner_node);
if (owner_theme.is_valid() && owner_theme->has_default_font_size()) {
return owner_theme->get_default_font_size();
}
owner_node = _get_next_owner_node(owner_node);
}
// Second, check global themes from the appropriate context.
ThemeContext *global_context = _get_active_owner_context();
for (const Ref<Theme> &theme : global_context->get_themes()) {
if (theme.is_valid()) {
if (theme->has_default_font_size()) {
return theme->get_default_font_size();
}
}
}
// Finally, if no match exists, return the universal default.
return ThemeDB::get_singleton()->get_fallback_font_size();
}
Ref<Theme> ThemeOwner::_get_owner_node_theme(Node *p_owner_node) const {
const Control *owner_c = Object::cast_to<Control>(p_owner_node);
if (owner_c) {
return owner_c->get_theme();
}
const Window *owner_w = Object::cast_to<Window>(p_owner_node);
if (owner_w) {
return owner_w->get_theme();
}
return Ref<Theme>();
}
Node *ThemeOwner::_get_next_owner_node(Node *p_from_node) const {
Node *parent = p_from_node->get_parent();
Control *parent_c = Object::cast_to<Control>(parent);
if (parent_c) {
return parent_c->get_theme_owner_node();
} else {
Window *parent_w = Object::cast_to<Window>(parent);
if (parent_w) {
return parent_w->get_theme_owner_node();
}
}
return nullptr;
}