Description: Add optional overriding of icon theme.
Author: Walter Lapchynski <wxl@ubuntu.com>
Last-Updated: 2018-08-22
Applied-Upstream: https://github.com/lxqt/lxqt-panel/pull/674/commits/1a70479ed931e07a67a182223426328ab3fcbeff
--- a/panel/config/configpaneldialog.cpp
+++ b/panel/config/configpaneldialog.cpp
@@ -56,3 +56,8 @@ void ConfigPanelDialog::showConfigPlugin
 {
     showPage(mPluginsPage);
 }
+
+void ConfigPanelDialog::updateIconThemeSettings()
+{
+    mPanelPage->updateIconThemeSettings();
+}
--- a/panel/config/configpaneldialog.h
+++ b/panel/config/configpaneldialog.h
@@ -43,6 +43,7 @@ public:
 
     void showConfigPanelPage();
     void showConfigPluginsPage();
+    void updateIconThemeSettings();
 
 private:
     ConfigPanelWidget *mPanelPage;
--- a/panel/config/configpanelwidget.cpp
+++ b/panel/config/configpanelwidget.cpp
@@ -57,6 +57,7 @@ ConfigPanelWidget::ConfigPanelWidget(LXQ
 
     fillComboBox_position();
     fillComboBox_alignment();
+    fillComboBox_icon();
 
     mOldPanelSize = mPanel->panelSize();
     mOldIconSize = mPanel->iconSize();
@@ -115,6 +116,9 @@ ConfigPanelWidget::ConfigPanelWidget(LXQ
     connect(ui->slider_opacity,             &QSlider::valueChanged,         this, &ConfigPanelWidget::editChanged);
 
     connect(ui->checkBox_reserveSpace, &QAbstractButton::toggled, [this](bool checked) { mPanel->setReserveSpace(checked, true); });
+
+    connect(ui->groupBox_icon, &QGroupBox::clicked, this, &ConfigPanelWidget::editChanged);
+    connect(ui->comboBox_icon, QOverload<int>::of(&QComboBox::activated), this, &ConfigPanelWidget::editChanged);
 }
 
 
@@ -211,6 +215,59 @@ void ConfigPanelWidget::fillComboBox_ali
     };
 }
 
+/************************************************
+ *
+ ************************************************/
+void ConfigPanelWidget::fillComboBox_icon()
+{
+    ui->groupBox_icon->setChecked(!mPanel->iconTheme().isEmpty());
+
+    QStringList themeList;
+    QStringList processed;
+    const QStringList baseDirs = QIcon::themeSearchPaths();
+    for (const QString &baseDirName : baseDirs)
+    {
+        QDir baseDir(baseDirName);
+        if (!baseDir.exists())
+            continue;
+        const QFileInfoList dirs = baseDir.entryInfoList(QDir::AllDirs | QDir::NoDotAndDotDot, QDir::Name);
+        for (const QFileInfo &dir : dirs)
+        {
+            if (!processed.contains(dir.canonicalFilePath()))
+            {
+                processed << dir.canonicalFilePath();
+                QDir Dir(dir.canonicalFilePath());
+                QSettings file(Dir.absoluteFilePath(QStringLiteral("index.theme")), QSettings::IniFormat);
+                if (file.status() == QSettings::NoError
+                    && !file.value(QStringLiteral("Icon Theme/Directories")).toStringList().join(QLatin1Char(' ')).isEmpty()
+                    && !file.value(QStringLiteral("Icon Theme/Hidden"), false).toBool())
+                {
+                    themeList << Dir.dirName();
+                }
+            }
+        }
+    }
+    if (!themeList.isEmpty())
+    {
+        themeList.sort();
+        ui->comboBox_icon->insertItems(0, themeList);
+        QString curTheme = QIcon::themeName();
+        if (!curTheme.isEmpty())
+            ui->comboBox_icon->setCurrentText(curTheme);
+    }
+}
+
+
+/************************************************
+ *
+ ************************************************/
+void ConfigPanelWidget::updateIconThemeSettings()
+{
+    ui->groupBox_icon->setChecked(!mPanel->iconTheme().isEmpty());
+    QString curTheme = QIcon::themeName();
+    if (!curTheme.isEmpty())
+        ui->comboBox_icon->setCurrentText(curTheme);
+}
 
 /************************************************
  *
@@ -284,6 +341,11 @@ void ConfigPanelWidget::editChanged()
 
     QString image = ui->checkBox_customBgImage->isChecked() ? ui->lineEdit_customBgImage->text() : QString();
     mPanel->setBackgroundImage(image, true);
+
+    if (!ui->groupBox_icon->isChecked())
+        mPanel->setIconTheme(QString());
+    else if (!ui->comboBox_icon->currentText().isEmpty())
+        mPanel->setIconTheme(ui->comboBox_icon->currentText());
 }
 
 
--- a/panel/config/configpanelwidget.h
+++ b/panel/config/configpanelwidget.h
@@ -49,6 +49,7 @@ public:
 
     int screenNum() const { return mScreenNum; }
     ILXQtPanel::Position position() const { return mPosition; }
+    void updateIconThemeSettings();
 
 signals:
     void changed();
@@ -73,6 +74,7 @@ private:
     void addPosition(const QString& name, int screen, LXQtPanel::Position position);
     void fillComboBox_position();
     void fillComboBox_alignment();
+    void fillComboBox_icon();
     int indexForPosition(int screen, ILXQtPanel::Position position);
     int getMaxLength();
 
--- a/panel/config/configpanelwidget.ui
+++ b/panel/config/configpanelwidget.ui
@@ -555,6 +555,44 @@
      </layout>
     </widget>
    </item>
+   <item>
+    <widget class="QGroupBox" name="groupBox_icon">
+     <property name="toolTip">
+      <string>A partial workaround for widget styles that
+cannot give a separate theme to the panel.
+
+You might also want to disable:
+
+LXQt Appearance Configuration →
+Icons Theme →
+Colorize icons based on widget style (palette)</string>
+     </property>
+     <property name="title">
+      <string>Override icon &amp;theme</string>
+     </property>
+     <property name="checkable">
+      <bool>true</bool>
+     </property>
+     <property name="checked">
+      <bool>false</bool>
+     </property>
+     <layout class="QFormLayout" name="formLayout_2">
+      <property name="formAlignment">
+       <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignVCenter</set>
+      </property>
+      <item row="0" column="0">
+       <widget class="QLabel" name="label_3">
+        <property name="text">
+         <string>Icon theme for panels:</string>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="1">
+       <widget class="QComboBox" name="comboBox_icon"/>
+      </item>
+     </layout>
+    </widget>
+   </item>
   </layout>
  </widget>
  <resources/>
--- a/panel/lxqtpanel.cpp
+++ b/panel/lxqtpanel.cpp
@@ -1354,6 +1354,28 @@ void LXQtPanel::setShowDelay(int showDel
         saveSettings(true);
 }
 
+QString LXQtPanel::iconTheme() const
+{
+    return mSettings->value("iconTheme").toString();
+}
+
+void LXQtPanel::setIconTheme(const QString& iconTheme)
+{
+    LXQtPanelApplication *a = reinterpret_cast<LXQtPanelApplication*>(qApp);
+    a->setIconTheme(iconTheme);
+}
+
+void LXQtPanel::updateConfigDialog() const
+{
+    if (!mConfigDialog.isNull() && mConfigDialog->isVisible())
+    {
+        mConfigDialog->updateIconThemeSettings();
+        const QList<QWidget*> widgets = mConfigDialog->findChildren<QWidget*>();
+        for (QWidget *widget : widgets)
+            widget->update();
+    }
+}
+
 bool LXQtPanel::isPluginSingletonAndRunnig(QString const & pluginId) const
 {
     Plugin const * plugin = mPlugins->pluginByID(pluginId);
--- a/panel/lxqtpanel.h
+++ b/panel/lxqtpanel.h
@@ -222,6 +222,7 @@ public:
     bool hidable() const { return mHidable; }
     int animationTime() const { return mAnimationTime; }
     int showDelay() const { return mShowDelayTimer.interval(); }
+    QString iconTheme() const;
 
     /*!
      * \brief Checks if a given Plugin is running and has the
@@ -232,6 +233,11 @@ public:
      * ILXQtPanelPlugin::SingleInstance flag set, false otherwise.
      */
     bool isPluginSingletonAndRunnig(QString const & pluginId) const;
+    /*!
+     * \brief Updates the config dialog. Used for updating its icons
+     * when the panel-specific icon theme changes.
+     */
+    void updateConfigDialog() const;
 
 public slots:
     /**
@@ -299,6 +305,7 @@ public slots:
     void setHidable(bool hidable, bool save); //!< \sa setPanelSize()
     void setAnimationTime(int animationTime, bool save); //!< \sa setPanelSize()
     void setShowDelay(int showDelay, bool save); //!< \sa setPanelSize()
+    void setIconTheme(const QString& iconTheme);
 
     /**
      * @brief Saves the current configuration, i.e. writes the current
@@ -549,7 +556,7 @@ private:
      * @brief Stores if mLength is stored in pixels or relative to the
      * screen size in percents. If true, the length is stored in percents,
      * otherwise in pixels.
-     * 
+     *
      * \sa mLength
      */
     bool mLengthInPercents;
--- a/panel/lxqtpanelapplication.cpp
+++ b/panel/lxqtpanelapplication.cpp
@@ -117,6 +117,15 @@ LXQtPanelApplication::LXQtPanelApplicati
 
     QStringList panels = d->mSettings->value("panels").toStringList();
 
+    // WARNING: Giving a separate icon theme to the panel is wrong and has side effects.
+    // However, it is optional and can be used as the last resort for avoiding a low
+    // contrast in the case of symbolic SVG icons. (The correct way of doing that is
+    // using a Qt widget style that can assign a separate theme/QPalette to the panel.)
+    mGlobalIconTheme = QIcon::themeName();
+    const QString iconTheme = d->mSettings->value("iconTheme").toString();
+    if (!iconTheme.isEmpty())
+        QIcon::setThemeName(iconTheme);
+
     if (panels.isEmpty())
     {
         panels << "panel1";
@@ -280,3 +289,21 @@ bool LXQtPanelApplication::isPluginSingl
 
     return false;
 }
+
+// See LXQtPanelApplication::LXQtPanelApplication for why this isn't good.
+void LXQtPanelApplication::setIconTheme(const QString &iconTheme)
+{
+    Q_D(LXQtPanelApplication);
+
+    d->mSettings->setValue("iconTheme", iconTheme == mGlobalIconTheme ? QString() : iconTheme);
+    QString newTheme = iconTheme.isEmpty() ? mGlobalIconTheme : iconTheme;
+    if (newTheme != QIcon::themeName())
+    {
+        QIcon::setThemeName(newTheme);
+        for(LXQtPanel* panel : qAsConst(mPanels))
+        {
+            panel->update();
+            panel->updateConfigDialog();
+        }
+    }
+}
--- a/panel/lxqtpanelapplication.h
+++ b/panel/lxqtpanelapplication.h
@@ -69,12 +69,14 @@ public:
     explicit LXQtPanelApplication(int& argc, char** argv);
     ~LXQtPanelApplication();
 
+    void setIconTheme(const QString &iconTheme);
+
     /*!
      * \brief Determines the number of LXQtPanel objects
      * \return the current number of LXQtPanel objects
      */
-    int count() { return mPanels.count(); }
-    
+    int count() const { return mPanels.count(); }
+
     /*!
      * \brief Checks if a given Plugin is running and has the
      * ILXQtPanelPlugin::SingleInstance flag set. As Plugins are added to
@@ -123,6 +125,10 @@ private:
      */
     QList<LXQtPanel*> mPanels;
     /*!
+     * \brief The global icon theme used by all apps (except for panels perhaps).
+     */
+    QString mGlobalIconTheme;
+    /*!
      * \brief Creates a new LXQtPanel with the given name and connects the
      * appropriate signals and slots.
      * This method can be used at application startup.