dolphinview: Add a dynamic view option

Added a 'dynamic view' option, which allows to switch from a 'compact' or 'details' view to an 'icons' view if most of the files in the directory are images or videos. It reverts to the previous view mode when we switch to a directory which doesn't meet that criteria.

The view mode is only changed once so users don't have to undo that for specific folders when they don't want icon view.

A setting is added in the "Display style" section of the general view setting page.

BUG: 491139

4 files changed, 67 insertions, 0 deletions

diff --git a/src/views/dolphinview.cpp b/src/views/dolphinview.cpp
index bff6e7586..50c014c6a 100644
--- a/src/views/dolphinview.cpp
+++ b/src/views/dolphinview.cpp
@@ -1945,6 +1945,7 @@ void DolphinView::slotDirectoryLoadingCompleted()
 
     Q_EMIT directoryLoadingCompleted();
 
+    applyDynamicView();
     updatePlaceholderLabel();
     updateWritableState();
 }
@@ -2213,6 +2214,51 @@ void DolphinView::applyModeToView()
     }
 }
 
+void DolphinView::applyDynamicView()
+{
+    ViewProperties props(viewPropertiesUrl());
+    /* return early if:
+     * - dynamic view is not enabled
+     * - the current view mode is already Icon View
+     * - dynamic view has previously changed the view mode
+     */
+    if (!GeneralSettings::dynamicView() || m_mode == IconsView || props.dynamicViewPassed()) {
+        return;
+    }
+
+    uint imageAndVideoCount = 0;
+    uint checkedItems = 0;
+    const uint totalItems = itemsCount();
+    const KFileItemList itemList = items();
+    bool applyDynamicView = false;
+
+    for (const auto &file : itemList) {
+        ++checkedItems;
+        const QString type = file.mimetype().slice(0, 5);
+
+        if (type == "image" || type == "video") {
+            ++imageAndVideoCount;
+            // if 2/3 or more of the items are images/videos, dynamic view should be applied
+            applyDynamicView = imageAndVideoCount >= (totalItems * 2 / 3);
+            if (applyDynamicView) {
+                break;
+            }
+        } else if (checkedItems - imageAndVideoCount > totalItems / 3) {
+            // if more than a third of the checked files are not media files, return
+            return;
+        }
+    }
+
+    if (!applyDynamicView) {
+        return;
+    }
+
+    props.setAutoSaveEnabled(!GeneralSettings::globalViewProps());
+    props.setDynamicViewPassed(true);
+    props.setViewMode(IconsView);
+    applyViewProperties(props);
+}
+
 void DolphinView::pasteToUrl(const QUrl &url)
 {
     KIO::PasteJob *job = KIO::paste(QApplication::clipboard()->mimeData(), url);
diff --git a/src/views/dolphinview.h b/src/views/dolphinview.h
index de4bc1af2..f491b6dd5 100644
--- a/src/views/dolphinview.h
+++ b/src/views/dolphinview.h
@@ -867,6 +867,11 @@ private:
      */
     void applyModeToView();
 
+    /**
+     * Changes the current view based on the content of the directory.
+     */
+    void applyDynamicView();
+
     enum Selection { HasSelection, NoSelection };
     /**
      * Helper method for DolphinView::requestStatusBarText().
diff --git a/src/views/viewproperties.cpp b/src/views/viewproperties.cpp
index 5dbdd938e..8e09009e5 100644
--- a/src/views/viewproperties.cpp
+++ b/src/views/viewproperties.cpp
@@ -369,6 +369,19 @@ bool ViewProperties::sortHiddenLast() const
     return m_node->sortHiddenLast();
 }
 
+void ViewProperties::setDynamicViewPassed(bool dynamicViewPassed)
+{
+    if (m_node->dynamicViewPassed() != dynamicViewPassed) {
+        m_node->setDynamicViewPassed(dynamicViewPassed);
+        update();
+    }
+}
+
+bool ViewProperties::dynamicViewPassed() const
+{
+    return m_node->dynamicViewPassed();
+}
+
 void ViewProperties::setVisibleRoles(const QList<QByteArray> &roles)
 {
     if (roles == visibleRoles()) {
diff --git a/src/views/viewproperties.h b/src/views/viewproperties.h
index 44c703482..bee1e7330 100644
--- a/src/views/viewproperties.h
+++ b/src/views/viewproperties.h
@@ -65,6 +65,9 @@ public:
     void setSortHiddenLast(bool hiddenLast);
     bool sortHiddenLast() const;
 
+    void setDynamicViewPassed(bool dynamicViewPassed);
+    bool dynamicViewPassed() const;
+
     /**
      * Sets the additional information for the current set view-mode.
      * Note that the additional-info property is the only property where