plugin: create caching image manager

No need for external proc

components/filedialog/FolderContents.qml

@@ -148,7 +148,6 @@ Item {
                 anchors.top: parent.top
                 anchors.topMargin: Appearance.padding.normal
 
-                asynchronous: true
                 implicitSize: Sizes.itemWidth - Appearance.padding.normal * 2
                 source: {
                     if (!item.fileIsDir)

components/images/CachingIconImage.qml

@@ -1,31 +1,42 @@
+pragma ComponentBehavior: Bound
+
+import qs.utils
+import Quickshell.Widgets
 import QtQuick
 
 Item {
-    property alias asynchronous: image.asynchronous
-    property alias status: image.status
-    property alias mipmap: image.mipmap
-    property alias backer: image
+    id: root
 
-    property real implicitSize
+    readonly property int status: loader.item?.status ?? Image.Null
     readonly property real actualSize: Math.min(width, height)
-
+    property real implicitSize
     property url source
 
-    onSourceChanged: {
-        if (source?.toString().startsWith("image://icon/"))
-            // Directly skip the path prop and treat like a normal Image component
-            image.source = source;
-        else if (source)
-            image.path = source;
-    }
-
     implicitWidth: implicitSize
     implicitHeight: implicitSize
 
-    CachingImage {
-        id: image
+    Loader {
+        id: loader
 
         anchors.fill: parent
-        fillMode: Image.PreserveAspectFit
+        sourceComponent: root.source ? root.source.toString().startsWith("image://icon/") ? iconImage : cachingImage : null
+    }
+
+    Component {
+        id: cachingImage
+
+        CachingImage {
+            path: Paths.strip(root.source)
+            fillMode: Image.PreserveAspectFit
+        }
+    }
+
+    Component {
+        id: iconImage
+
+        IconImage {
+            source: root.source
+            asynchronous: true
+        }
     }
 }

components/images/CachingImage.qml

@@ -1,44 +1,29 @@
 import qs.utils
 import Caelestia
-import Quickshell
-import Quickshell.Io
 import QtQuick
 
 Image {
     id: root
 
-    property string path
-    property string hash
-    readonly property url cachePath: `${Paths.imagecache}/${hash}@${effectiveWidth}x${effectiveHeight}.png`
+    property alias path: manager.path
 
-    readonly property real effectiveScale: QsWindow.window?.devicePixelRatio ?? 1
-    readonly property int effectiveWidth: Math.ceil(width * effectiveScale)
-    readonly property int effectiveHeight: Math.ceil(height * effectiveScale)
+    property int sourceWidth
+    property int sourceHeight
 
     asynchronous: true
     fillMode: Image.PreserveAspectCrop
-    sourceSize.width: effectiveWidth
-    sourceSize.height: effectiveHeight
-
-    onPathChanged: shaProc.exec(["sha256sum", Paths.strip(path)])
-
-    onCachePathChanged: {
-        if (hash)
-            source = cachePath;
-    }
+    sourceSize.width: sourceWidth
+    sourceSize.height: sourceHeight
 
     onStatusChanged: {
-        if (source == cachePath && status === Image.Error)
-            source = path;
-        else if (source == path && status === Image.Ready)
-            CUtils.saveItem(this, cachePath);
+        if (!manager.usingCache && status === Image.Ready)
+            CUtils.saveItem(this, manager.cachePath);
     }
 
-    Process {
-        id: shaProc
+    CachingImageManager {
+        id: manager
 
-        stdout: StdioCollector {
-            onStreamFinished: root.hash = text.split(" ")[0]
-        }
+        item: root
+        cacheDir: Paths.imagecache
     }
 }

plugin/src/Caelestia/CMakeLists.txt

@@ -3,6 +3,7 @@ qt_add_qml_module(caelestia
     VERSION 0.1
     SOURCES
         cutils.hpp cutils.cpp
+        cachingimagemanager.hpp cachingimagemanager.cpp
 )
 
 qt_query_qml_module(caelestia

plugin/src/Caelestia/cachingimagemanager.cpp

@@ -0,0 +1,122 @@
+#include "cachingimagemanager.hpp"
+
+#include <qobject.h>
+#include <QtQuick/QQuickItem>
+#include <QtQuick/QQuickWindow>
+#include <QCryptographicHash>
+#include <QThreadPool>
+#include <QFile>
+
+qreal CachingImageManager::effectiveScale() const {
+    if (m_item->window() && m_item->window()->screen()) {
+        return m_item->window()->screen()->devicePixelRatio();
+    }
+
+    return 1.0;
+}
+
+int CachingImageManager::effectiveWidth() const {
+    int width = std::ceil(m_item->width() * effectiveScale());
+    m_item->setProperty("sourceWidth", width);
+    return width;
+}
+
+int CachingImageManager::effectiveHeight() const {
+    int height = std::ceil(m_item->height() * effectiveScale());
+    m_item->setProperty("sourceHeight", height);
+    return height;
+}
+
+QQuickItem* CachingImageManager::item() const {
+    return m_item;
+}
+
+void CachingImageManager::setItem(QQuickItem* item) {
+    if (m_item == item) {
+        return;
+    }
+
+    m_item = item;
+    emit itemChanged();
+}
+
+QUrl CachingImageManager::cacheDir() const {
+    return m_cacheDir;
+}
+
+void CachingImageManager::setCacheDir(const QUrl& cacheDir) {
+    if (m_cacheDir == cacheDir) {
+        return;
+    }
+
+    m_cacheDir = cacheDir;
+    emit cacheDirChanged();
+}
+
+QString CachingImageManager::path() const {
+    return m_path;
+}
+
+void CachingImageManager::setPath(const QString& path) {
+    if (m_path == path) {
+        return;
+    }
+
+    m_path = path;
+    emit pathChanged();
+
+    if (!path.isEmpty()) {
+        QThreadPool::globalInstance()->start([path, this] {
+            const QString filename = QString("%1@%2x%3.png")
+                .arg(sha256sum(path))
+                .arg(effectiveWidth())
+                .arg(effectiveHeight());
+
+            m_cachePath = m_cacheDir.resolved(QUrl(filename));
+            emit cachePathChanged();
+
+            if (!m_cachePath.isLocalFile()) {
+                qWarning() << "CachingImageManager::setPath: cachePath" << m_cachePath << "is not a local file";
+                return;
+            }
+
+            if (QFile::exists(m_cachePath.toLocalFile())) {
+                QMetaObject::invokeMethod(m_item, [this]() {
+                    m_item->setProperty("source", m_cachePath);
+                }, Qt::QueuedConnection);
+
+                m_usingCache = true;
+                emit usingCacheChanged();
+            } else {
+                QMetaObject::invokeMethod(m_item, [path, this]() {
+                    m_item->setProperty("source", QUrl::fromLocalFile(path));
+                }, Qt::QueuedConnection);
+
+                m_usingCache = false;
+                emit usingCacheChanged();
+            }
+        });
+    }
+}
+
+QUrl CachingImageManager::cachePath() const {
+    return m_cachePath;
+}
+
+bool CachingImageManager::usingCache() const {
+    return m_usingCache;
+}
+
+QString CachingImageManager::sha256sum(const QString& path) const {
+    QFile file(path);
+    if (!file.open(QIODevice::ReadOnly)) {
+        qWarning() << "CachingImageManager::sha256sum: failed to open" << path;
+        return "";
+    }
+
+    QCryptographicHash hash(QCryptographicHash::Sha256);
+    hash.addData(&file);
+    file.close();
+
+    return hash.result().toHex();
+}

plugin/src/Caelestia/cachingimagemanager.hpp

@@ -0,0 +1,57 @@
+#pragma once
+
+#include <qobject.h>
+#include <qqmlintegration.h>
+#include <QtQuick/QQuickItem>
+
+class CachingImageManager : public QObject {
+    Q_OBJECT;
+    QML_ELEMENT;
+
+    Q_PROPERTY(QQuickItem* item READ item WRITE setItem NOTIFY itemChanged REQUIRED);
+    Q_PROPERTY(QUrl cacheDir READ cacheDir WRITE setCacheDir NOTIFY cacheDirChanged REQUIRED);
+
+    Q_PROPERTY(QString path READ path WRITE setPath NOTIFY pathChanged);
+    Q_PROPERTY(QUrl cachePath READ cachePath NOTIFY cachePathChanged);
+    Q_PROPERTY(bool usingCache READ usingCache NOTIFY usingCacheChanged);
+
+public:
+    explicit CachingImageManager(QObject* parent = nullptr): QObject(parent) {};
+
+    [[nodiscard]] QQuickItem* item() const;
+    void setItem(QQuickItem* item);
+
+    [[nodiscard]] QUrl cacheDir() const;
+    void setCacheDir(const QUrl& cacheDir);
+
+    [[nodiscard]] QString path() const;
+    void setPath(const QString& path);
+
+    [[nodiscard]] QUrl cachePath() const;
+    [[nodiscard]] bool usingCache() const;
+
+signals:
+    void itemChanged();
+    void cacheDirChanged();
+
+    void pathChanged();
+    void cachePathChanged();
+    void usingCacheChanged();
+
+private slots:
+    void handleStatusChanged();
+
+private:
+    QQuickItem* m_item;
+    QUrl m_cacheDir;
+
+    QString m_path;
+    QUrl m_cachePath;
+    bool m_usingCache;
+
+    [[nodiscard]] qreal effectiveScale() const;
+    int effectiveWidth() const;
+    int effectiveHeight() const;
+
+    [[nodiscard]] QString sha256sum(const QString& path) const;
+};

plugin/src/Caelestia/cutils.hpp

@@ -1,11 +1,12 @@
 #pragma once
 
 #include <qobject.h>
+#include <qqmlintegration.h>
 #include <QtQuick/QQuickItem>
 
 class CUtils : public QObject {
     Q_OBJECT;
-    QML_NAMED_ELEMENT(CUtils);
+    QML_ELEMENT;
     QML_SINGLETON;
 
 public: