Qt: Filter expression toolbar dark mode updates.

Move plus-8.png to stock_icons/8x8 and rename it list-add.template.png
which conforms to the Freedesktop icon naming specifications and makes
it a template icon.

Update our style sheet when we recive a QEvent::PaletteChange.

Ping-Bug: 15511
Change-Id: I4b8ddcb4eb64f11faec21d5df4a3fd7fdc5cf488
Reviewed-on: https://code.wireshark.org/review/33626
Reviewed-by: Gerald Combs <gerald@wireshark.org>
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot
Reviewed-by: Anders Broman <a.broman58@gmail.com>

2 files changed, 34 insertions, 12 deletions

diff --git a/ui/qt/widgets/filter_expression_toolbar.cpp b/ui/qt/widgets/filter_expression_toolbar.cpp
index 42036f23c6..cc56e46c87 100644
--- a/ui/qt/widgets/filter_expression_toolbar.cpp
+++ b/ui/qt/widgets/filter_expression_toolbar.cpp
@@ -34,18 +34,7 @@ struct filter_expression_data
 FilterExpressionToolBar::FilterExpressionToolBar(QWidget * parent) :
     DragDropToolBar(parent)
 {
-    // Try to draw 1-pixel-wide separator lines from the button label
-    // ascent to its baseline.
-    int sep_margin = (fontMetrics().height() * 0.5) - 1;
-    QColor sep_color = ColorUtils::alphaBlend(palette().text(), palette().base(), 0.3);
-    setStyleSheet(QString(
-                "QToolBar { background: none; border: none; spacing: 1px; }"
-                "QFrame {"
-                "  min-width: 1px; max-width: 1px;"
-                "  margin: %1px 0 %2px 0; padding: 0;"
-                "  background-color: %3;"
-                "}"
-                ).arg(sep_margin).arg(sep_margin - 1).arg(sep_color.name()));
+    updateStyleSheet();
 
     setContextMenuPolicy(Qt::CustomContextMenu);
 
@@ -60,6 +49,19 @@ FilterExpressionToolBar::FilterExpressionToolBar(QWidget * parent) :
 
 }
 
+bool FilterExpressionToolBar::event(QEvent *event)
+{
+    switch (event->type()) {
+    case QEvent::PaletteChange:
+        updateStyleSheet();
+        break;
+    default:
+        break;
+
+    }
+    return DragDropToolBar::event(event);
+}
+
 void FilterExpressionToolBar::onCustomMenuHandler(const QPoint& pos)
 {
     QAction * filterAction = actionAt(pos);
@@ -200,6 +202,22 @@ void FilterExpressionToolBar::toolBarShowPreferences()
     emit filterPreferences();
 }
 
+void FilterExpressionToolBar::updateStyleSheet()
+{
+    // Try to draw 1-pixel-wide separator lines from the button label
+    // ascent to its baseline.
+    int sep_margin = (fontMetrics().height() * 0.5) - 1;
+    QColor sep_color = ColorUtils::alphaBlend(palette().text(), palette().base(), 0.3);
+    setStyleSheet(QString(
+                "QToolBar { background: none; border: none; spacing: 1px; }"
+                "QFrame {"
+                "  min-width: 1px; max-width: 1px;"
+                "  margin: %1px 0 %2px 0; padding: 0;"
+                "  background-color: %3;"
+                "}"
+                ).arg(sep_margin).arg(sep_margin - 1).arg(sep_color.name()));
+}
+
 int FilterExpressionToolBar::uatRowIndexForFilter(QString label, QString expression)
 {
     int result = -1;
diff --git a/ui/qt/widgets/filter_expression_toolbar.h b/ui/qt/widgets/filter_expression_toolbar.h
index af4956c770..5601825549 100644
--- a/ui/qt/widgets/filter_expression_toolbar.h
+++ b/ui/qt/widgets/filter_expression_toolbar.h
@@ -20,6 +20,9 @@ class FilterExpressionToolBar : public DragDropToolBar
 public:
     explicit FilterExpressionToolBar(QWidget * parent = Q_NULLPTR);
 
+protected:
+    virtual bool event(QEvent *event);
+
 public slots:
     void filterExpressionsChanged();
 
@@ -41,6 +44,7 @@ private slots:
    void toolBarShowPreferences();
 
 private:
+   void updateStyleSheet();
    int uatRowIndexForFilter(QString label, QString expression);
 
    static gboolean filter_expression_add_action(const void *key, void *value, void *user_data);