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Qt: add naive lazy loading to screenshot manager
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@ -8,47 +8,49 @@
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#include <QDirIterator>
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#include <QListWidget>
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#include <QScreen>
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#include <QScrollBar>
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#include <QVBoxLayout>
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#include <QtConcurrent>
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screenshot_manager_dialog::screenshot_manager_dialog(QWidget* parent) : QDialog(parent)
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{
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setWindowTitle(tr("Screenshots"));
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m_icon_size = QSize(160, 90);
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m_grid = new QListWidget(this);
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m_grid->setViewMode(QListWidget::IconMode);
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m_grid->setMovement(QListWidget::Static);
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m_grid->setResizeMode(QListWidget::Adjust);
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m_grid->setIconSize(QSize(160, 90));
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m_grid->setGridSize(m_grid->iconSize() + QSize(10, 10));
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m_grid->setIconSize(m_icon_size);
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m_grid->setGridSize(m_icon_size + QSize(10, 10));
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const std::string screen_path = fs::get_config_dir() + "screenshots/";
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const QStringList filter{ QStringLiteral("*.png") };
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QDirIterator dir_iter(QString::fromStdString(screen_path), filter, QDir::Files | QDir::NoDotAndDotDot, QDirIterator::Subdirectories);
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QPixmap placeholder(m_icon_size);
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placeholder.fill(Qt::gray);
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m_placeholder = QIcon(placeholder);
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while (dir_iter.hasNext())
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{
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const QString filepath = dir_iter.next();
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QListWidgetItem* item = new QListWidgetItem;
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item->setData(Qt::UserRole, filepath);
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item->setIcon(QIcon(filepath));
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item->setData(item_role::source, filepath);
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item->setData(item_role::loaded, false);
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item->setIcon(m_placeholder);
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item->setToolTip(filepath);
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m_grid->addItem(item);
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}
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connect(m_grid, &QListWidget::itemDoubleClicked, [this](QListWidgetItem* item)
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{
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if (!item)
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{
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return;
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}
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m_icon_loader = new QFutureWatcher<thumbnail>(this);
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connect(m_icon_loader, &QFutureWatcher<QIcon>::resultReadyAt, this, &screenshot_manager_dialog::update_icon);
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const QString filepath = item->data(Qt::UserRole).toString();
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screenshot_preview* preview = new screenshot_preview(filepath);
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preview->show();
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});
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connect(m_grid, &QListWidget::itemDoubleClicked, this, &screenshot_manager_dialog::show_preview);
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connect(m_grid->verticalScrollBar(), &QScrollBar::valueChanged, this, &screenshot_manager_dialog::update_icons);
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QVBoxLayout* layout = new QVBoxLayout;
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layout->setContentsMargins(0, 0, 0, 0);
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@ -57,3 +59,89 @@ screenshot_manager_dialog::screenshot_manager_dialog(QWidget* parent) : QDialog(
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resize(QGuiApplication::primaryScreen()->availableSize() * 3 / 5);
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}
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screenshot_manager_dialog::~screenshot_manager_dialog()
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{
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m_icon_loader->cancel();
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m_icon_loader->waitForFinished();
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}
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void screenshot_manager_dialog::show_preview(QListWidgetItem* item)
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{
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if (!item)
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{
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return;
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}
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const QString filepath = item->data(Qt::UserRole).toString();
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screenshot_preview* preview = new screenshot_preview(filepath);
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preview->show();
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}
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void screenshot_manager_dialog::update_icon(int index)
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{
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const thumbnail tn = m_icon_loader->resultAt(index);
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if (QListWidgetItem* item = m_grid->item(tn.index))
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{
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item->setIcon(tn.icon);
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item->setData(item_role::loaded, true);
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}
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}
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void screenshot_manager_dialog::update_icons(int value)
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{
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const QRect visible_rect = rect();
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QList<thumbnail> thumbnails_to_load;
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const bool forward = value >= m_scrollbar_value;
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m_scrollbar_value = value;
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const int first = forward ? 0 : (m_grid->count() - 1);
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const int last = forward ? (m_grid->count() - 1) : 0;
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for (int i = first; forward ? i <= last : i >= last; forward ? ++i : --i)
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{
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if (QListWidgetItem* item = m_grid->item(i))
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{
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const bool is_loaded = item->data(item_role::loaded).toBool();
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const bool is_visible = visible_rect.intersects(m_grid->visualItemRect(item));
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if (is_visible)
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{
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if (!is_loaded)
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{
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thumbnails_to_load.push_back({ QIcon(), item->data(item_role::source).toString() , i });
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}
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}
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else if (is_loaded)
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{
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item->setIcon(m_placeholder);
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item->setData(item_role::loaded, false);
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}
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}
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}
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if (m_icon_loader->isRunning())
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{
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m_icon_loader->cancel();
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m_icon_loader->waitForFinished();
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}
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std::function<thumbnail(thumbnail)> load = [icon_size = m_icon_size](thumbnail tn) -> thumbnail
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{
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QPixmap pixmap(tn.path);
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tn.icon = QIcon(pixmap.scaled(icon_size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
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return tn;
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};
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m_icon_loader->setFuture(QtConcurrent::mapped(thumbnails_to_load, load));
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}
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void screenshot_manager_dialog::resizeEvent(QResizeEvent* event)
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{
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QDialog::resizeEvent(event);
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update_icons(m_scrollbar_value);
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}
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@ -1,8 +1,12 @@
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#pragma once
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#include <QDialog>
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#include <QFutureWatcher>
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#include <QIcon>
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#include <QSize>
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class QListWidget;
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class QListWidgetItem;
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class screenshot_manager_dialog : public QDialog
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{
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@ -10,7 +14,40 @@ class screenshot_manager_dialog : public QDialog
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public:
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screenshot_manager_dialog(QWidget* parent = nullptr);
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~screenshot_manager_dialog();
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protected:
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void resizeEvent(QResizeEvent* event) override;
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private Q_SLOTS:
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void update_icon(int index);
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Q_SIGNALS:
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void signal_icon_change(int index, const QString& path);
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private:
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void show_preview(QListWidgetItem* item);
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void update_icons(int value);
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enum item_role
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{
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source = Qt::UserRole,
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loaded = Qt::UserRole + 1,
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};
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struct thumbnail
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{
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QIcon icon;
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QString path;
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int index = 0;
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};
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QListWidget* m_grid = nullptr;
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QFutureWatcher<thumbnail>* m_icon_loader;
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QSize m_icon_size;
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QIcon m_placeholder;
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int m_scrollbar_value = 0;
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};
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