Red-highlight the text field for the executable path if wrong path was provided in the settings.

CHANGELOG.md

 # Changelog
 
+## 22.12
+
+### New features
+
+    * Red-highlight the text field for the executable path if wrong path was provided in the settings
+
 ## 22.08
 
 ### New features

src/backends/backendsettingswidget.cpp

@@ -15,15 +15,18 @@
     Boston, MA  02110-1301, USA.
 
     ---
-    Copyright (C) 2020 Alexander Semke <alexander.semke@web.de>
+    Copyright (C) 2020-2022 Alexander Semke <alexander.semke@web.de>
  */
 
 #include "backendsettingswidget.h"
 #include "qthelpconfig.h"
 
+#include <QFile>
 #include <QHBoxLayout>
 #include <QTabWidget>
 
+#include <KUrlRequester>
+
 BackendSettingsWidget::BackendSettingsWidget(QWidget* parent, const QString& id) : QWidget(parent), m_id(id)
 {
 
@@ -44,3 +47,19 @@ void BackendSettingsWidget::tabChanged(int index) {
         }
     }
 }
+
+void BackendSettingsWidget::fileNameChanged(const QString& fileName) {
+    if (!m_urlRequester)
+        return;
+
+    bool invalid = (!fileName.isEmpty() && !QFile::exists(fileName));
+    if (invalid) {
+        QPalette p;                                                                                                                                            \
+        if (qGray(p.color(QPalette::Base).rgb()) > 160) /* light */                                                                                            \
+            m_urlRequester->setStyleSheet(QLatin1String("background: rgb(255, 200, 200);"));                                                                             \
+        else /* dark */                                                                                                                                        \
+            m_urlRequester->setStyleSheet(QLatin1String("background: rgb(128, 0, 0);"));
+    }
+    else
+        m_urlRequester->setStyleSheet(QString());
+}

src/backends/backendsettingswidget.h

@@ -15,7 +15,7 @@
     Boston, MA  02110-1301, USA.
 
     ---
-    Copyright (C) 2020 Alexander Semke <alexander.semke@web.de>
+    Copyright (C) 2020-2022 Alexander Semke <alexander.semke@web.de>
  */
 
 #ifndef BACKENDSETTINGSWIDGET_H
@@ -25,6 +25,7 @@
 
 class QTabWidget;
 class QtHelpConfig;
+class KUrlRequester;
 
 class BackendSettingsWidget : public QWidget
 {
@@ -40,9 +41,11 @@ protected:
     QString m_id;
     QTabWidget* m_tabWidget = nullptr;
     QWidget* m_tabDocumentation = nullptr;
+    KUrlRequester* m_urlRequester = nullptr;
 
 public Q_SLOTS:
     void tabChanged(int);
+    void fileNameChanged(const QString&);
 };
 
 #endif /* BACKENDSETTINGSWIDGET_H */

src/backends/julia/juliasettingswidget.cpp

@@ -15,7 +15,7 @@
     Boston, MA  02110-1301, USA.
 
     ---
-    Copyright (C) 2020 Alexander Semke <alexander.semke@web.de>
+    Copyright (C) 2020-2022 Alexander Semke <alexander.semke@web.de>
  */
 
 #include "juliasettingswidget.h"
@@ -26,5 +26,8 @@ JuliaSettingsWidget::JuliaSettingsWidget(QWidget* parent, const QString& id) : B
 
     m_tabWidget = tabWidget;
     m_tabDocumentation = tabDocumentation;
+    m_urlRequester = kcfg_replPath;
+
     connect(tabWidget, &QTabWidget::currentChanged, this, &BackendSettingsWidget::tabChanged);
+    connect(kcfg_replPath, &KUrlRequester::textChanged, this, &BackendSettingsWidget::fileNameChanged);
 }

src/backends/maxima/maximasettingswidget.cpp

@@ -15,7 +15,7 @@
     Boston, MA  02110-1301, USA.
 
     ---
-    Copyright (C) 2020 Alexander Semke <alexander.semke@web.de>
+    Copyright (C) 2020-2022 Alexander Semke <alexander.semke@web.de>
     Copyright (C) 2020 Shubham <aryan100jangid@gmail.com>
  */
 
@@ -27,5 +27,8 @@ MaximaSettingsWidget::MaximaSettingsWidget(QWidget* parent, const QString& id) :
 
     m_tabWidget = tabWidget;
     m_tabDocumentation = tabDocumentation;
+    m_urlRequester = kcfg_Path;
+
     connect(tabWidget, &QTabWidget::currentChanged, this, &BackendSettingsWidget::tabChanged);
+    connect(kcfg_Path, &KUrlRequester::textChanged, this, &MaximaSettingsWidget::fileNameChanged);
 }

src/backends/maxima/maximasettingswidget.h

@@ -15,7 +15,7 @@
     Boston, MA  02110-1301, USA.
 
     ---
-    Copyright (C) 2020 Alexander Semke <alexander.semke@web.de>
+    Copyright (C) 2020-2022 Alexander Semke <alexander.semke@web.de>
     Copyright (C) 2020 Shubham <aryan100jangid@gmail.com>
  */
 
@@ -27,9 +27,9 @@
 
 class MaximaSettingsWidget : public BackendSettingsWidget, public Ui::MaximaSettingsBase
 {
-  Q_OBJECT
+Q_OBJECT
 
-  public:
+public:
     explicit MaximaSettingsWidget(QWidget* parent = nullptr, const QString& id = QString());
 };
 

src/backends/octave/octavesettingswidget.cpp

@@ -15,7 +15,7 @@
     Boston, MA  02110-1301, USA.
 
     ---
-    Copyright (C) 2020 Alexander Semke <alexander.semke@web.de>
+    Copyright (C) 2020-2022 Alexander Semke <alexander.semke@web.de>
  */
 
 #include "octavesettingswidget.h"
@@ -26,5 +26,8 @@ OctaveSettingsWidget::OctaveSettingsWidget(QWidget* parent, const QString& id) :
 
     m_tabWidget = tabWidget;
     m_tabDocumentation = tabDocumentation;
+    m_urlRequester = kcfg_Path;
+
     connect(tabWidget, &QTabWidget::currentChanged, this, &BackendSettingsWidget::tabChanged);
+    connect(kcfg_Path, &KUrlRequester::textChanged, this, &BackendSettingsWidget::fileNameChanged);
 }

src/backends/sage/sagesettingswidget.cpp

@@ -15,7 +15,7 @@
     Boston, MA  02110-1301, USA.
 
     ---
-    Copyright (C) 2020 Alexander Semke <alexander.semke@web.de>
+    Copyright (C) 2020-2022 Alexander Semke <alexander.semke@web.de>
  */
 
 #include "sagesettingswidget.h"
@@ -26,5 +26,8 @@ SageSettingsWidget::SageSettingsWidget(QWidget* parent, const QString& id) : Bac
 
     m_tabWidget = tabWidget;
     m_tabDocumentation = tabDocumentation;
+    m_urlRequester = kcfg_Path;
+
     connect(tabWidget, &QTabWidget::currentChanged, this, &BackendSettingsWidget::tabChanged);
+    connect(kcfg_Path, &KUrlRequester::textChanged, this, &BackendSettingsWidget::fileNameChanged);
 }

src/backends/scilab/scilabsettingswidget.cpp

@@ -15,7 +15,7 @@
     Boston, MA  02110-1301, USA.
 
     ---
-    Copyright (C) 2020 Alexander Semke <alexander.semke@web.de>
+    Copyright (C) 2020-2022 Alexander Semke <alexander.semke@web.de>
  */
 
 #include "scilabsettingswidget.h"
@@ -26,5 +26,8 @@ ScilabSettingsWidget::ScilabSettingsWidget(QWidget* parent, const QString& id) :
 
     m_tabWidget = tabWidget;
     m_tabDocumentation = tabDocumentation;
+    m_urlRequester = kcfg_Path;
+
     connect(tabWidget, &QTabWidget::currentChanged, this, &BackendSettingsWidget::tabChanged);
+    connect(kcfg_Path, &KUrlRequester::textChanged, this, &BackendSettingsWidget::fileNameChanged);
 }