Try to allocate the DShow device list and the buttons ONLY when switching to...

Try to allocate the DShow device list and the buttons ONLY when switching to it and not all the time you open a file.

modules/gui/qt4/components/open_panels.cpp

@@ -584,19 +584,7 @@ CaptureOpenPanel::CaptureOpenPanel( QWidget *_parent, intf_thread_t *_p_intf ) :
     if( module_Exists( p_intf, "dshow" ) ){
     addModuleAndLayouts( DSHOW_DEVICE, dshow, "DirectShow" );
 
-    /* dshow Main */
-    int line = 0;
-    module_config_t *p_config =
-        config_FindConfig( VLC_OBJECT(p_intf), "dshow-vdev" );
-    vdevDshowW = new StringListConfigControl(
-        VLC_OBJECT(p_intf), p_config, this, false, dshowDevLayout, line );
-    line++;
-
-    p_config = config_FindConfig( VLC_OBJECT(p_intf), "dshow-adev" );
-    adevDshowW = new StringListConfigControl(
-        VLC_OBJECT(p_intf), p_config, this, false, dshowDevLayout, line );
-    line++;
-
+    devLayout = dshowDevLayout;
     /* dshow Properties */
     QLabel *dshowVSizeLabel = new QLabel( qtr( "Video size" ) );
     dshowPropLayout->addWidget( dshowVSizeLabel, 0, 0 );
@@ -1074,6 +1062,20 @@ void CaptureOpenPanel::updateButtons()
             bdaBandLabel->show();
         }
         break;
+    case DSHOW_DEVICE:
+        /* dshow Main */
+        int line = 0;
+        module_config_t *p_config =
+            config_FindConfig( VLC_OBJECT(p_intf), "dshow-vdev" );
+        vdevDshowW = new StringListConfigControl(
+                VLC_OBJECT(p_intf), p_config, this, false, devLayout, line );
+        line++;
+
+        p_config = config_FindConfig( VLC_OBJECT(p_intf), "dshow-adev" );
+        adevDshowW = new StringListConfigControl(
+                VLC_OBJECT(p_intf), p_config, this, false, devLayout, line );
+        line++;
+        break;
 #else
     case DVB_DEVICE:
         if( dvbs->isChecked() ) dvbFreq->setSuffix(" kHz");

modules/gui/qt4/components/open_panels.hpp

@@ -187,6 +187,7 @@ private:
     QComboBox *bdaBandBox;
     StringListConfigControl *vdevDshowW, *adevDshowW;
     QLineEdit *dshowVSizeLine;
+    QGridLayout * devLayout;
 #else
     QRadioButton *dvbs, *dvbt, *dvbc;
     QSpinBox  *v4lFreq, *pvrFreq, *pvrBitr;