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From 425ae90cae55f9136e0620c3165baf839e54bc0a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20L=C3=BCbking?= <thomas.luebking@gmail.com>
Date: Fri, 26 Dec 2025 18:54:33 +0100
Subject: [PATCH] add option or preview images in file dialogs
closes #57
---
Qarma.cpp | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 95 insertions(+), 1 deletion(-)
diff --git a/Qarma.cpp b/Qarma.cpp
index 3708360..c0f1f77 100644
--- a/Qarma.cpp
+++ b/Qarma.cpp
@@ -24,6 +24,7 @@
#include <QCheckBox>
#include <QColorDialog>
#include <QComboBox>
+#include <QCryptographicHash>
#include <QDate>
#include <QDBusConnection>
#include <QDBusConnectionInterface>
@@ -34,6 +35,7 @@
#include <QFontDialog>
#include <QFormLayout>
#include <QIcon>
+#include <QImageReader>
#include <QInputDialog>
#include <QLabel>
#include <QLocale>
@@ -42,12 +44,15 @@
#include <QProcess>
#include <QProgressDialog>
#include <QPropertyAnimation>
+#include <QProxyStyle>
#include <QPushButton>
#include <QScreen>
#include <QScrollBar>
#include <QSettings>
#include <QSlider>
#include <QSocketNotifier>
+#include <QSplitter>
+#include <QStandardPaths>
#include <QStringBuilder>
#include <QStringList>
#include <QTextBrowser>
@@ -785,6 +790,83 @@ char Qarma::showMessage(const QStringList &args, char type)
return 0;
}
+QPixmap thumbnail(const QString &path, uint size)
+{
+ size = qMin(size, 1024u);
+ QImage thumb;
+ QImageReader thumbReader;
+ thumbReader.setFileName(path);
+ if (!thumbReader.canRead())
+ return QPixmap();
+
+ thumbReader.setQuality(50);
+ QSize sz = thumbReader.size();
+ QSize origSz = sz;
+ bool skipThumbnail = sz.width()*sz.height() < 1920*1200+1;
+
+ if (skipThumbnail) {
+ sz.scale(QSize(size,size), Qt::KeepAspectRatio);
+ thumbReader.setScaledSize(sz);
+ } else {
+ QFileInfo info(path);
+ QString canonicalPath = info.canonicalFilePath();
+ if (canonicalPath.isEmpty())
+ canonicalPath = info.absoluteFilePath();
+ QUrl url = QUrl::fromLocalFile(canonicalPath);
+ QCryptographicHash md5(QCryptographicHash::Md5);
+ md5.addData(QFile::encodeName(url.adjusted(QUrl::RemovePassword).url()));
+
+ QString folder;
+ uint tSize;
+ if (size <= 128) {
+ tSize = 128; folder = "normal/";
+ } else if (size <= 256) {
+ tSize = 256; folder = "large/";
+ } else if (size <= 512) {
+ tSize = 512; folder = "x-large/";
+ } else {
+ tSize = 1024; folder = "xx-large/";
+ }
+ Q_UNUSED(tSize);
+
+ const QString thumbPath = QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) +
+ QLatin1String("/thumbnails/") + folder +
+ QString::fromLatin1(md5.result().toHex()) + QStringLiteral(".png");
+ QFileInfo tInfo(thumbPath);
+ if (tInfo.exists() && info.metadataChangeTime() <= tInfo.lastModified() && info.lastModified() <= tInfo.lastModified()) {
+ thumbReader.setFileName(thumbPath);
+ sz.scale(QSize(size,size), Qt::KeepAspectRatio);
+ thumbReader.setScaledSize(sz);
+ if (thumbReader.read(&thumb)) {
+ int w = thumb.text("Thumb::Image::Width").toInt();
+ int h = thumb.text("Thumb::Image::Height").toInt();
+ if (origSz == QSize(w, h))
+ return QPixmap::fromImage(thumb);
+ }
+ }
+ thumbReader.setFileName(path);
+// sz.scale(QSize(tSize,tSize), Qt::KeepAspectRatio); // in case we'll ever store the thumbnail
+ sz.scale(QSize(size,size), Qt::KeepAspectRatio);
+ thumbReader.setScaledSize(sz);
+ }
+ if (!thumbReader.read(&thumb))
+ return QPixmap();
+// if (skipThumbnail)
+ return QPixmap::fromImage(thumb);
+}
+
+class DblClckStyle : public QProxyStyle
+{
+ public:
+ int styleHint(StyleHint hint, const QStyleOption *option = nullptr,
+ const QWidget *widget = nullptr, QStyleHintReturn *returnData = nullptr) const override
+ {
+ if (hint == QStyle::SH_ItemView_ActivateItemOnSingleClick)
+ return false;
+ return QProxyStyle::styleHint(hint, option, widget, returnData);
+ }
+};
+
char Qarma::showFileSelection(const QStringList &args)
{
QFileDialog *dlg = new QFileDialog;
@@ -827,6 +909,17 @@ char Qarma::showFileSelection(const QStringList &args)
if (idx > -1)
mimeFilter = mimeFilter.left(idx).trimmed() + " (" + mimeFilter.mid(idx+1).trimmed() + ")";
mimeFilters << mimeFilter;
+ } else if (args.at(i) == "--preview-images") {
+ READ_INT(size, UInt, "--preview-images must be followed by a positive number for the thumbnail size");
+ dlg->setOption(QFileDialog::DontUseNativeDialog);
+ if (QSplitter *splitter = dlg->findChild<QSplitter*>()) {
+ qApp->setStyle(new DblClckStyle);
+ QLabel *preview = new QLabel(splitter);
+ splitter->addWidget(preview);
+ connect(dlg, &QFileDialog::currentChanged, [=](const QString &path) {
+ preview->setPixmap(thumbnail(path, size));
+ });
+ }
}
else { WARN_UNKNOWN_ARG("--file-selection") }
}
@@ -1815,7 +1908,8 @@ void Qarma::printHelp(const QString &category)
Help("--save", tr("Activate save mode")) <<
Help("--separator=SEPARATOR", tr("Set output separator character")) <<
Help("--confirm-overwrite", tr("Confirm file selection if filename already exists")) <<
- Help("--file-filter=NAME | PATTERN1 PATTERN2 ...", tr("Sets a filename filter")));
+ Help("--file-filter=NAME | PATTERN1 PATTERN2 ...", tr("Sets a filename filter")) <<
+ Help("--preview-images=SIZE", "QARMA ONLY! " + tr("Show image thumbnails of SIZE")));
helpDict["list"] = CategoryHelp(tr("List Command\n %1 --list [Options] [Item1 ...]\nList Options").arg(applicationName()), HelpList() <<
Help("--text=TEXT", tr("Set the dialog text")) <<
Help("--column=COLUMN", tr("Set the column header")) <<
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