Add DialogPositioner to ensure dialogs are fully on screen and remain on

screen when screen orientation changes.
Add DialPopup to allow dials to adjusted with a slider, which is easier
on touchscreens.
Add TableTapAndHold to support table context menus on touchscreens.

plugins/samplesource/testsource/testsourcegui.cpp

@@ -28,6 +28,8 @@
 #include "gui/colormapper.h"
 #include "gui/glspectrum.h"
 #include "gui/basicdevicesettingsdialog.h"
+#include "gui/dialpopup.h"
+#include "gui/dialogpositioner.h"
 #include "dsp/dspengine.h"
 #include "dsp/dspcommands.h"
 #include "util/db.h"
@@ -76,6 +78,7 @@ TestSourceGui::TestSourceGui(DeviceUISet *deviceUISet, QWidget* parent) :
     m_sampleSource->setMessageQueueToGUI(&m_inputMessageQueue);
 
     connect(this, SIGNAL(customContextMenuRequested(const QPoint &)), this, SLOT(openDeviceSettingsDialog(const QPoint &)));
+    DialPopup::addPopupsToChildDials(this);
 }
 
 TestSourceGui::~TestSourceGui()
@@ -531,6 +534,7 @@ void TestSourceGui::openDeviceSettingsDialog(const QPoint& p)
         dialog.setReverseAPIDeviceIndex(m_settings.m_reverseAPIDeviceIndex);
 
         dialog.move(p);
+        new DialogPositioner(&dialog, false);
         dialog.exec();
 
         m_settings.m_useReverseAPI = dialog.useReverseAPI();