From 3084a4e11e54b71065a408c7d288489bc72ea8a2 Mon Sep 17 00:00:00 2001
From: Alessio Bonfiglio <alessio.bonfiglio@mail.polimi.it>
Date: Wed, 11 Mar 2026 20:52:55 +0100
Subject: filterbar: Add support to match case and glob patterns for the filter
 bar

Currently, Dolphin's filter bar defaults to plain text, but it actually has a hidden regex functionality too: it tries to auto-detect and switch to a regular expression if characters like '*', '?', or '[' are present in the search string.
This approach has a couple of issues. First, the regex/wildcard functionality is completely hidden from the user. Second, the auto-detection is flawed because those are perfectly valid characters in Linux filenames. If a user tries to filter for a file literally named [draft].txt, the auto-switching kicks in and causes unexpected behavior.

This MR fixes this by making the filtering modes explicit through a ComboBox at the side of the filter bar, with the options 'Plain Text', 'Glob' and 'Regular Expression'. It also adds a button to toggle the case sensitive matching. A visual feedback for when the user is inputting an invalid expression has also been implemented by turning the bar background red and making appear an error symbol.
---
 src/filterbar/filterbar.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'src/filterbar/filterbar.h')

diff --git a/src/filterbar/filterbar.h b/src/filterbar/filterbar.h
index 1424f4cb8..924c6dba3 100644
--- a/src/filterbar/filterbar.h
+++ b/src/filterbar/filterbar.h
@@ -10,9 +10,12 @@
 #define FILTERBAR_H
 
 #include "animatedheightwidget.h"
+#include "kitemviews/private/kfileitemmodelfilter.h"
 
 class QLineEdit;
 class QToolButton;
+class QComboBox;
+class QAction;
 
 /**
  * @brief Provides an input field for filtering the currently shown items.
@@ -35,6 +38,9 @@ public:
      */
     void selectAll();
 
+    KFileItemModelFilter::FilterMode filterMode() const;
+    bool isCaseSensitive() const;
+
 public Q_SLOTS:
     /** Clears the input field. */
     void clear();
@@ -50,6 +56,16 @@ Q_SIGNALS:
      */
     void filterChanged(const QString &nameFilter);
 
+    /**
+     * Emitted when the case sensitive mode has been changed
+     */
+    void caseSensitiveChanged(bool caseSensitive);
+
+    /**
+     * Emitted when the filter mode has been changed
+     */
+    void filterModeChanged(KFileItemModelFilter::FilterMode mode);
+
     /**
      * Emitted as soon as the filterbar should get closed.
      */
@@ -70,6 +86,12 @@ protected:
 private:
     QLineEdit *m_filterInput;
     QToolButton *m_lockButton;
+    QToolButton *m_caseSensitiveButton;
+    QComboBox *m_filterModeComboBox;
+    QAction *m_invalidPatternAction;
+
+    /** Enable or disable the alterative view for when a pattern is invalid */
+    void updateInvalidPatternView();
 };
 
 #endif
-- 
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