feat: add Variants type for creating instances

This commit is contained in:
outfoxxed 2024-01-30 03:32:21 -08:00
parent 23837e5195
commit d14258df8e
Signed by: outfoxxed
GPG key ID: 4C88A185FB89301E
3 changed files with 135 additions and 0 deletions

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@ -25,6 +25,7 @@ qt_standard_project_setup(REQUIRES 6.6)
qt_add_executable(qtshell
src/cpp/main.cpp
src/cpp/shell.cpp
src/cpp/variants.cpp
)
qt_add_qml_module(qtshell URI QtShell)

94
src/cpp/variants.cpp Normal file
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@ -0,0 +1,94 @@
#include "variants.hpp"
#include <algorithm>
#include <utility>
#include <qcontainerfwd.h>
#include <qlogging.h>
void Variants::setVariants(QVariantList variants) {
this->mVariants = std::move(variants);
qDebug() << "configurations updated:" << this->mVariants;
this->updateVariants();
}
void Variants::componentComplete() {
qDebug() << "configure ready";
this->updateVariants();
}
void Variants::updateVariants() {
if (this->mComponent == nullptr) {
qWarning() << "Variants instance does not have a component specified";
return;
}
// clean up removed entries
for (auto iter = this->instances.values.begin(); iter < this->instances.values.end();) {
if (this->mVariants.contains(iter->first)) {
iter++;
} else {
iter->second->deleteLater();
iter = this->instances.values.erase(iter);
}
}
for (auto iter = this->mVariants.begin(); iter < this->mVariants.end(); iter++) {
auto& variantObj = *iter;
if (!variantObj.canConvert<QVariantMap>()) {
qWarning() << "value passed to Variants is not an object and will be ignored:" << variantObj;
} else {
auto variant = variantObj.value<QVariantMap>();
for (auto iter2 = this->mVariants.begin(); iter2 < iter; iter2++) {
if (*iter2 == variantObj) {
qWarning() << "same value specified twice in Variants, duplicates will be ignored:"
<< variantObj;
goto outer;
}
}
if (this->instances.contains(variant)) {
continue; // we dont need to recreate this one
}
auto* instance = this->mComponent->createWithInitialProperties(variant, nullptr);
if (instance == nullptr) {
qWarning() << "failed to create variant with object" << variant;
continue;
}
instance->setParent(this);
this->instances.insert(variant, instance);
}
outer:;
}
}
template <typename K, typename V>
bool AwfulMap<K, V>::contains(const K& key) const {
return std::ranges::any_of(this->values, [&](const QPair<K, V>& pair) {
return pair.first == key;
});
}
template <typename K, typename V>
void AwfulMap<K, V>::insert(K key, V value) {
this->values.push_back(QPair<K, V>(key, value));
}
template <typename K, typename V>
bool AwfulMap<K, V>::remove(const K& key) {
for (auto iter = this->values.begin(); iter < this->values.end(); iter++) {
if (iter->first == key) {
this->values.erase(iter);
return true;
}
}
return false;
}

40
src/cpp/variants.hpp Normal file
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@ -0,0 +1,40 @@
#pragma once
#include <qcontainerfwd.h>
#include <qlist.h>
#include <qmap.h>
#include <qobject.h>
#include <qqmlcomponent.h>
#include <qqmlparserstatus.h>
// extremely inefficient map
template <typename K, typename V>
class AwfulMap {
public:
[[nodiscard]] bool contains(const K& key) const;
void insert(K key, V value); // assumes no duplicates
bool remove(const K& key); // returns true if anything was removed
QList<QPair<K, V>> values;
};
class Variants: public QObject, public QQmlParserStatus {
Q_OBJECT;
Q_PROPERTY(QQmlComponent* component MEMBER mComponent);
Q_PROPERTY(QVariantList variants MEMBER mVariants WRITE setVariants);
Q_CLASSINFO("DefaultProperty", "component");
QML_ELEMENT;
public:
explicit Variants(QObject* parent = nullptr): QObject(parent) {}
void classBegin() override {};
void componentComplete() override;
private:
void setVariants(QVariantList variants);
void updateVariants();
QQmlComponent* mComponent = nullptr;
QVariantList mVariants;
AwfulMap<QVariantMap, QObject*> instances;
};