Improve file dialog filter for adding custom icons.

src/core/Tools.cpp

@@ -20,6 +20,7 @@
 #include <QtCore/QIODevice>
 #include <QtCore/QLocale>
 #include <QtCore/QStringList>
+#include <QtGui/QImageReader>
 
 namespace Tools {
 
@@ -84,4 +85,22 @@ QDateTime currentDateTimeUtc ()
 #endif
 }
 
+QString imageReaderFilter()
+{
+    QList<QByteArray> formats = QImageReader::supportedImageFormats();
+    QStringList formatsStringList;
+
+    Q_FOREACH (const QByteArray& format, formats) {
+        for (int i = 0; i < format.size(); i++) {
+            if (!QChar(format.at(i)).isLetterOrNumber()) {
+                continue;
+            }
+        }
+
+        formatsStringList.append("*." + QString::fromAscii(format).toLower());
+    }
+
+    return formatsStringList.join(" ");
+}
+
 } // namespace Tools

src/core/Tools.h

@@ -30,6 +30,7 @@ QString humanReadableFileSize(qint64 bytes);
 bool hasChild(const QObject* parent, const QObject* child);
 bool readAllFromDevice(QIODevice* device, QByteArray& data);
 QDateTime currentDateTimeUtc();
+QString imageReaderFilter();
 
 } // namespace Tools
 

src/gui/EditEntryWidget.cpp

@@ -422,8 +422,11 @@ void EditEntryWidget::removeCurrentAttachment()
 void EditEntryWidget::addCustomIcon()
 {
     if (m_metadata) {
+        QString filter = QString("%1 (%2);;%3 (*.*)").arg(tr("Images"),
+                    Tools::imageReaderFilter(), tr("All files"));
+
         QString filename = QFileDialog::getOpenFileName(
-                    this, tr("Select Image"), "", tr("Image Files (*.png *.jpg *.bmp)"));
+                    this, tr("Select Image"), "", filter);
         if (!filename.isEmpty()) {
             QImage image(filename);
             if (!image.isNull()) {