qt: make Qt Mouse/Input/KeyEvent to VLC converter functions const

modules/gui/qt/util/customwidgets.cpp

@@ -109,7 +109,7 @@ void VLCQDial::paintEvent( QPaintEvent *event )
 /***************************************************************************
  * Hotkeys converters
  ***************************************************************************/
-int qtKeyModifiersToVLC( QInputEvent* e )
+int qtKeyModifiersToVLC( const QInputEvent* e )
 {
     int i_keyModifiers = 0;
     if( e->modifiers() & Qt::ShiftModifier ) i_keyModifiers |= KEY_MODIFIER_SHIFT;
@@ -265,7 +265,7 @@ static int keycmp( const void *a, const void *b )
     return *q - m->qt;
 }
 
-int qtEventToVLCKey( QKeyEvent *e )
+int qtEventToVLCKey( const QKeyEvent *e )
 {
     int qtk = e->key();
     uint32_t i_vlck = 0;
@@ -294,7 +294,7 @@ int qtEventToVLCKey( QKeyEvent *e )
     return i_vlck;
 }
 
-int qtWheelEventToVLCKey( QWheelEvent *e )
+int qtWheelEventToVLCKey( const QWheelEvent *e )
 {
     const qreal v_cos_deadzone = 0.45; // ~63 degrees
     const qreal h_cos_deadzone = 0.95; // ~15 degrees

modules/gui/qt/util/customwidgets.hpp

@@ -144,9 +144,9 @@ class QKeyEvent;
 class QWheelEvent;
 class QInputEvent;
 
-int qtKeyModifiersToVLC( QInputEvent* e );
-int qtEventToVLCKey( QKeyEvent *e );
-int qtWheelEventToVLCKey( QWheelEvent *e );
+int qtKeyModifiersToVLC( const QInputEvent* e );
+int qtEventToVLCKey( const QKeyEvent *e );
+int qtWheelEventToVLCKey( const QWheelEvent *e );
 QString VLCKeyToString( unsigned val, bool );
 
 #endif