Qt: Handle ApplicationPaletteChange events in the welcome page.

Update our various welcome page style sheets when we receive an
ApplicationPaletteChange event.

It looks like ApplicationPaletteChange is the proper way to detect a
system-wide theme change, since we can infinitely recurse if we hold
things wrong inside a regular PaletteChange event (I'm guessing setting
CSS background and foreground colors were the culprits in this case).
Switch from PaletteChange to ApplicationPaletteChange everywhere.

Ping-Bug: 15511
Change-Id: I6e7aa627d9ca1d1d3872ab31620ea5c579061191
Reviewed-on: https://code.wireshark.org/review/33703
Reviewed-by: Gerald Combs <gerald@wireshark.org>
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/ui/qt/welcome_page.h b/ui/qt/welcome_page.h
index dce4a64e7e..73aa7f2218 100644
--- a/ui/qt/welcome_page.h
+++ b/ui/qt/welcome_page.h
@@ -37,6 +37,7 @@ public slots:
     void interfaceSelected();
 
 protected:
+    virtual bool event(QEvent *event);
     virtual void resizeEvent(QResizeEvent *event);
     virtual void changeEvent(QEvent* event);
 
@@ -46,6 +47,8 @@ protected slots:
     void on_helpLabel_clicked();
 
 private:
+    void updateStyleSheets();
+
     Ui::WelcomePage *welcome_ui_;
     QString flavor_;
     QString show_in_str_;