Qt: Display filter toolbar behavior tweaks.

By default GtkToolbar shows overflow items in a menu. QToolBar shows
them in a bigger toolbar. This is a problem for users with lots of
display filter expressions because expanding the display filter toolbar
can make it very tall.

QToolBar can optionally overflow into a menu, but as noted in
https://bugreports.qt.io/browse/QTBUG-2472 there isn't a way do so
directly, e.g. with a setter. Force an overflow menu in the display
filter toolbar by adding a child QToolBar and adding filter expression
actions to it.

While we're here, set the minimum width of the display filter edit to
two-thirds of the width of the main window.

Change-Id: I49cd58397e087f1aa79b5bbce471f827e9804148
Reviewed-on: https://code.wireshark.org/review/15134
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Gerald Combs <gerald@wireshark.org>

3 files changed, 20 insertions, 5 deletions

diff --git a/ui/qt/main_window.cpp b/ui/qt/main_window.cpp
index da39acaaa3..2e1d9b453d 100644
--- a/ui/qt/main_window.cpp
+++ b/ui/qt/main_window.cpp
@@ -361,6 +361,13 @@ MainWindow::MainWindow(QWidget *parent) :
 
     main_ui_->displayFilterToolBar->insertWidget(main_ui_->actionDisplayFilterExpression, df_combo_box_);
 
+    // Make sure filter expressions overflow into a menu instead of a
+    // larger toolbar. We do this by adding them to a child toolbar.
+    // https://bugreports.qt.io/browse/QTBUG-2472
+    filter_expression_toolbar_ = new QToolBar();
+    filter_expression_toolbar_->setStyleSheet("QToolBar { background: none; border: none; }");
+    main_ui_->displayFilterToolBar->addWidget(filter_expression_toolbar_);
+
     wireless_frame_ = new WirelessFrame(this);
     main_ui_->wirelessToolBar->addWidget(wireless_frame_);
     connect(wireless_frame_, SIGNAL(pushAdapterStatus(const QString&)),
@@ -2139,6 +2146,11 @@ void MainWindow::changeEvent(QEvent* event)
     QMainWindow::changeEvent(event);
 }
 
+void MainWindow::resizeEvent(QResizeEvent *)
+{
+    df_combo_box_->setMinimumWidth(width() * 2 / 3); // Arbitrary
+}
+
 /* Update main window items based on whether there's a capture in progress. */
 void MainWindow::setForCaptureInProgress(gboolean capture_in_progress)
 {
diff --git a/ui/qt/main_window.h b/ui/qt/main_window.h
index 235011fe57..72bf460479 100644
--- a/ui/qt/main_window.h
+++ b/ui/qt/main_window.h
@@ -154,6 +154,7 @@ private:
     QWidget *freeze_focus_;
     QMap<QAction *, ts_type> td_actions;
     QMap<QAction *, ts_precision> tp_actions;
+    QToolBar *filter_expression_toolbar_;
 
     bool capture_stopping_;
     bool capture_filter_valid_;
@@ -609,7 +610,8 @@ private slots:
     void on_actionContextWikiProtocolPage_triggered();
     void on_actionContextFilterFieldReference_triggered();
 
-    void changeEvent(QEvent* event);
+    virtual void changeEvent(QEvent* event);
+    virtual void resizeEvent(QResizeEvent *);
 
 #ifdef HAVE_EXTCAP
     void extcap_options_finished(int result);
diff --git a/ui/qt/main_window_slots.cpp b/ui/qt/main_window_slots.cpp
index 5a144545cb..a63824a667 100644
--- a/ui/qt/main_window_slots.cpp
+++ b/ui/qt/main_window_slots.cpp
@@ -772,10 +772,10 @@ void MainWindow::captureFileSaveStarted(const QString &file_path)
 void MainWindow::filterExpressionsChanged()
 {
     // Recreate filter buttons
-    foreach (QAction *act, main_ui_->displayFilterToolBar->actions()) {
+    foreach (QAction *act, filter_expression_toolbar_->actions()) {
         // Permanent actions shouldn't have data
         if (act->property(dfe_property_).isValid()) {
-            main_ui_->displayFilterToolBar->removeAction(act);
+            filter_expression_toolbar_->removeAction(act);
             delete act;
         }
     }
@@ -783,13 +783,14 @@ void MainWindow::filterExpressionsChanged()
     // XXX Add a context menu for removing and changing buttons.
     for (struct filter_expression *fe = *pfilter_expression_head; fe != NULL; fe = fe->next) {
         if (!fe->enabled) continue;
-        QAction *dfb_action = new QAction(fe->label, main_ui_->displayFilterToolBar);
+        QAction *dfb_action = new QAction(fe->label, filter_expression_toolbar_);
         dfb_action->setToolTip(fe->expression);
         dfb_action->setData(fe->expression);
         dfb_action->setProperty(dfe_property_, true);
-        main_ui_->displayFilterToolBar->addAction(dfb_action);
+        filter_expression_toolbar_->addAction(dfb_action);
         connect(dfb_action, SIGNAL(triggered()), this, SLOT(displayFilterButtonClicked()));
     }
+    main_ui_->displayFilterToolBar->update();
 }
 
 //