From ce20b81070c8283a7895e46dd79d560fb0b81462 Mon Sep 17 00:00:00 2001
From: Doris Verria <doris.verria@qt.io>
Date: Wed, 14 Dec 2022 22:40:15 +0100
Subject: [PATCH] iOS File Dialog: Support setting name filters
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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Fixes: QTBUG-93624
Pick-to: 6.5
Change-Id: I2e1b522d572fd36f58a3de90f0a685f5d22dfeeb
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
---
 .../ios/qiosdocumentpickercontroller.mm       | 58 ++++++++++++++-----
 1 file changed, 45 insertions(+), 13 deletions(-)

diff --git a/src/plugins/platforms/ios/qiosdocumentpickercontroller.mm b/src/plugins/platforms/ios/qiosdocumentpickercontroller.mm
index 765d8848d2..350c965e87 100644
--- a/src/plugins/platforms/ios/qiosdocumentpickercontroller.mm
+++ b/src/plugins/platforms/ios/qiosdocumentpickercontroller.mm
@@ -14,19 +14,30 @@
 {
     NSMutableArray <UTType *> *docTypes = [[[NSMutableArray alloc] init] autorelease];
 
-    switch (fileDialog->options()->fileMode()) {
-    case QFileDialogOptions::AnyFile:
-    case QFileDialogOptions::ExistingFile:
-    case QFileDialogOptions::ExistingFiles:
-        [docTypes addObject:[UTType typeWithIdentifier:(__bridge NSString *)kUTTypeContent]];
-        [docTypes addObject:[UTType typeWithIdentifier:(__bridge NSString *)kUTTypeItem]];
-        [docTypes addObject:[UTType typeWithIdentifier:(__bridge NSString *)kUTTypeData]];
-        break;
-    // Showing files is not supported in Directory mode in iOS
-    case QFileDialogOptions::Directory:
-    case QFileDialogOptions::DirectoryOnly:
-        [docTypes addObject:[UTType typeWithIdentifier:(__bridge NSString *)kUTTypeFolder]];
-        break;
+    QStringList nameFilters = fileDialog->options()->nameFilters();
+    if (!nameFilters.isEmpty() && (fileDialog->options()->fileMode() != QFileDialogOptions::Directory
+                               || fileDialog->options()->fileMode() != QFileDialogOptions::DirectoryOnly))
+    {
+        QStringList results;
+        for (const QString &filter : nameFilters)
+            results.append(QPlatformFileDialogHelper::cleanFilterList(filter));
+
+        docTypes = [self computeAllowedFileTypes:results];
+    } else {
+        switch (fileDialog->options()->fileMode()) {
+        case QFileDialogOptions::AnyFile:
+        case QFileDialogOptions::ExistingFile:
+        case QFileDialogOptions::ExistingFiles:
+            [docTypes addObject:[UTType typeWithIdentifier:(__bridge NSString *)kUTTypeContent]];
+            [docTypes addObject:[UTType typeWithIdentifier:(__bridge NSString *)kUTTypeItem]];
+            [docTypes addObject:[UTType typeWithIdentifier:(__bridge NSString *)kUTTypeData]];
+            break;
+        // Showing files is not supported in Directory mode in iOS
+        case QFileDialogOptions::Directory:
+        case QFileDialogOptions::DirectoryOnly:
+            [docTypes addObject:[UTType typeWithIdentifier:(__bridge NSString *)kUTTypeFolder]];
+            break;
+        }
     }
 
     if (self = [super initForOpeningContentTypes:docTypes]) {
@@ -75,4 +86,25 @@
     emit m_fileDialog->reject();
 }
 
+- (NSMutableArray<UTType*>*)computeAllowedFileTypes:(QStringList)filters
+{
+    QStringList fileTypes;
+    for (const QString &filter : filters) {
+        if (filter.contains(u'?'))
+            continue;
+
+        if (filter.count(u'*') != 1)
+            continue;
+
+        auto extensions = filter.split('.', Qt::SkipEmptyParts);
+        fileTypes += extensions.last();
+    }
+
+    NSMutableArray<UTType *> *result = [NSMutableArray<UTType *> arrayWithCapacity:fileTypes.size()];
+    for (const QString &string : fileTypes)
+        [result addObject:[UTType typeWithFilenameExtension:string.toNSString()]];
+
+    return result;
+}
+
 @end