diff widgets/PropertyBox.cpp @ 1203:ff042979331b 3.0-integration

Merge from branch svg, and thus (in some subrepos) from levelpanwidget

--- a/widgets/PropertyBox.cpp	Wed Dec 14 11:56:47 2016 +0000
+++ b/widgets/PropertyBox.cpp	Mon Dec 19 16:34:38 2016 +0000
@@ -20,23 +20,28 @@
 #include "base/PlayParameters.h"
 #include "base/PlayParameterRepository.h"
 #include "layer/Layer.h"
-#include "layer/ColourDatabase.h"
 #include "base/UnitDatabase.h"
 #include "base/RangeMapper.h"
 
 #include "AudioDial.h"
 #include "LEDButton.h"
 #include "IconLoader.h"
+#include "LevelPanWidget.h"
+#include "LevelPanToolButton.h"
+#include "WidgetScale.h"
 
 #include "NotifyingCheckBox.h"
 #include "NotifyingComboBox.h"
 #include "NotifyingPushButton.h"
-#include "ColourNameDialog.h"
+#include "NotifyingToolButton.h"
+#include "ColourComboBox.h"
+#include "ColourMapComboBox.h"
 
 #include <QGridLayout>
 #include <QHBoxLayout>
 #include <QVBoxLayout>
 #include <QPushButton>
+#include <QToolButton>
 #include <QLabel>
 #include <QFrame>
 #include <QApplication>
@@ -103,9 +108,6 @@
     connect(UnitDatabase::getInstance(), SIGNAL(unitDatabaseChanged()),
             this, SLOT(unitDatabaseChanged()));
 
-    connect(ColourDatabase::getInstance(), SIGNAL(colourDatabaseChanged()),
-            this, SLOT(colourDatabaseChanged()));
-
 #ifdef DEBUG_PROPERTY_BOX
     cerr << "PropertyBox[" << this << "]::PropertyBox returning" << endl;
 #endif
@@ -147,7 +149,7 @@
     m_viewPlayFrame->setFrameStyle(QFrame::StyledPanel | QFrame::Sunken);
     m_mainBox->addWidget(m_viewPlayFrame);
 
-    QHBoxLayout *layout = new QHBoxLayout;
+    QGridLayout *layout = new QGridLayout;
     m_viewPlayFrame->setLayout(layout);
 
     layout->setMargin(layout->margin() / 2);
@@ -156,32 +158,18 @@
     SVDEBUG << "PropertyBox::populateViewPlayFrame: container " << m_container << " (name " << m_container->getPropertyContainerName() << ") params " << params << endl;
 #endif
 
-    if (layer) {
-	QLabel *showLabel = new QLabel(tr("Show"));
-	layout->addWidget(showLabel);
-	layout->setAlignment(showLabel, Qt::AlignVCenter);
+    QSize buttonSize = WidgetScale::scaleQSize(QSize(26, 26));
+    int col = 0;
 
-	m_showButton = new LEDButton(Qt::blue);
-	layout->addWidget(m_showButton);
-	connect(m_showButton, SIGNAL(stateChanged(bool)),
-		this, SIGNAL(showLayer(bool)));
-        connect(m_showButton, SIGNAL(mouseEntered()),
-                this, SLOT(mouseEnteredWidget()));
-        connect(m_showButton, SIGNAL(mouseLeft()),
-                this, SLOT(mouseLeftWidget()));
-	layout->setAlignment(m_showButton, Qt::AlignVCenter);
-    }
-    
     if (params) {
-
-	QLabel *playLabel = new QLabel(tr("Play"));
-	layout->addWidget(playLabel);
-	layout->setAlignment(playLabel, Qt::AlignVCenter);
-
-	m_playButton = new LEDButton(Qt::darkGreen);
-        m_playButton->setState(!params->isPlayMuted());
-	layout->addWidget(m_playButton);
-	connect(m_playButton, SIGNAL(stateChanged(bool)),
+        
+        m_playButton = new NotifyingToolButton;
+        m_playButton->setCheckable(true);
+        m_playButton->setIcon(IconLoader().load("speaker"));
+        m_playButton->setToolTip(tr("Click to toggle playback"));
+        m_playButton->setChecked(!params->isPlayMuted());
+        m_playButton->setFixedSize(buttonSize);
+	connect(m_playButton, SIGNAL(toggled(bool)),
 		this, SLOT(playAudibleButtonChanged(bool)));
         connect(m_playButton, SIGNAL(mouseEntered()),
                 this, SLOT(mouseEnteredWidget()));
@@ -189,76 +177,56 @@
                 this, SLOT(mouseLeftWidget()));
 	connect(params, SIGNAL(playAudibleChanged(bool)),
 		this, SLOT(playAudibleChanged(bool)));
-	layout->setAlignment(m_playButton, Qt::AlignVCenter);
 
-	layout->insertStretch(-1, 10);
+        LevelPanToolButton *levelPan = new LevelPanToolButton;
+        levelPan->setFixedSize(buttonSize);
+        levelPan->setImageSize((buttonSize.height() * 3) / 4);
+        layout->addWidget(levelPan, 0, col++, Qt::AlignCenter);
+        connect(levelPan, SIGNAL(levelChanged(float)),
+                this, SLOT(playGainControlChanged(float)));
+        connect(levelPan, SIGNAL(panChanged(float)),
+                this, SLOT(playPanControlChanged(float)));
+        connect(params, SIGNAL(playGainChanged(float)),
+                levelPan, SLOT(setLevel(float)));
+        connect(params, SIGNAL(playPanChanged(float)),
+                levelPan, SLOT(setPan(float)));
+        connect(levelPan, SIGNAL(mouseEntered()),
+                this, SLOT(mouseEnteredWidget()));
+        connect(levelPan, SIGNAL(mouseLeft()),
+                this, SLOT(mouseLeftWidget()));
+
+	layout->addWidget(m_playButton, 0, col++, Qt::AlignCenter);
 
         if (params->getPlayClipId() != "") {
-            QPushButton *playParamButton =
-                new QPushButton(QIcon(":icons/faders.png"), "");
-            playParamButton->setFixedWidth(24);
-            playParamButton->setFixedHeight(24);
-            layout->addWidget(playParamButton);
+            QToolButton *playParamButton = new QToolButton;
+            playParamButton->setObjectName("playParamButton");
+            playParamButton->setIcon(IconLoader().load("faders"));
+            playParamButton->setFixedSize(buttonSize);
+            layout->addWidget(playParamButton, 0, col++, Qt::AlignCenter);
             connect(playParamButton, SIGNAL(clicked()),
                     this, SLOT(editPlayParameters()));
+            connect(playParamButton, SIGNAL(mouseEntered()),
+                    this, SLOT(mouseEnteredWidget()));
+            connect(playParamButton, SIGNAL(mouseLeft()),
+                    this, SLOT(mouseLeftWidget()));
         }
+    }
 
-	AudioDial *gainDial = new AudioDial;
-	layout->addWidget(gainDial);
-	gainDial->setMeterColor(Qt::darkRed);
-	gainDial->setMinimum(-50);
-	gainDial->setMaximum(50);
-	gainDial->setPageStep(1);
-	gainDial->setFixedWidth(24);
-	gainDial->setFixedHeight(24);
-	gainDial->setNotchesVisible(false);
-        gainDial->setObjectName(tr("Playback Gain"));
-        gainDial->setRangeMapper(new LinearRangeMapper
-                                 (-50, 50, -25, 25, tr("dB")));
-	gainDial->setDefaultValue(0);
-        gainDial->setShowToolTip(true);
-	connect(gainDial, SIGNAL(valueChanged(int)),
-		this, SLOT(playGainDialChanged(int)));
-	connect(params, SIGNAL(playGainChanged(float)),
-		this, SLOT(playGainChanged(float)));
-	connect(this, SIGNAL(changePlayGainDial(int)),
-		gainDial, SLOT(setValue(int)));
-        connect(gainDial, SIGNAL(mouseEntered()),
+    layout->setColumnStretch(col++, 10);
+
+    if (layer) {
+
+	QLabel *showLabel = new QLabel(tr("Show"));
+	layout->addWidget(showLabel, 0, col++, Qt::AlignVCenter | Qt::AlignRight);
+
+	m_showButton = new LEDButton(palette().highlight().color());
+	layout->addWidget(m_showButton, 0, col++, Qt::AlignVCenter | Qt::AlignLeft);
+	connect(m_showButton, SIGNAL(stateChanged(bool)),
+		this, SIGNAL(showLayer(bool)));
+        connect(m_showButton, SIGNAL(mouseEntered()),
                 this, SLOT(mouseEnteredWidget()));
-        connect(gainDial, SIGNAL(mouseLeft()),
+        connect(m_showButton, SIGNAL(mouseLeft()),
                 this, SLOT(mouseLeftWidget()));
-        playGainChanged(params->getPlayGain());
-	layout->setAlignment(gainDial, Qt::AlignVCenter);
-
-	AudioDial *panDial = new AudioDial;
-	layout->addWidget(panDial);
-	panDial->setMeterColor(Qt::darkGreen);
-	panDial->setMinimum(-50);
-	panDial->setMaximum(50);
-	panDial->setPageStep(1);
-	panDial->setFixedWidth(24);
-	panDial->setFixedHeight(24);
-	panDial->setNotchesVisible(false);
-	panDial->setToolTip(tr("Playback Pan / Balance"));
-	panDial->setDefaultValue(0);
-        panDial->setObjectName(tr("Playback Pan / Balance"));
-        panDial->setShowToolTip(true);
-	connect(panDial, SIGNAL(valueChanged(int)),
-		this, SLOT(playPanDialChanged(int)));
-	connect(params, SIGNAL(playPanChanged(float)),
-		this, SLOT(playPanChanged(float)));
-	connect(this, SIGNAL(changePlayPanDial(int)),
-		panDial, SLOT(setValue(int)));
-        connect(panDial, SIGNAL(mouseEntered()),
-                this, SLOT(mouseEnteredWidget()));
-        connect(panDial, SIGNAL(mouseLeft()),
-                this, SLOT(mouseLeftWidget()));
-        playPanChanged(params->getPlayPan());
-	layout->setAlignment(panDial, Qt::AlignVCenter);
-
-    } else {
-
-	layout->insertStretch(-1, 10);
     }
 }
 
@@ -288,27 +256,38 @@
 	      << groupName << "\"" << endl;
 #endif
 
-    bool inGroup = (groupName != QString());
+    if (!have) {
 
-    if (!have) {
-	if (inGroup) {
+        QLabel *labelWidget = 0;
+
+	if (groupName != QString()) {
 	    if (m_groupLayouts.find(groupName) == m_groupLayouts.end()) {
-#ifdef DEBUG_PROPERTY_BOX
-		cerr << "PropertyBox: adding label \"" << groupName << "\" and frame for group for \"" << name << "\"" << endl;
+                labelWidget = new QLabel(groupName, m_mainWidget);
+            }
+        } else {
+            groupName = "ungrouped: " + propertyLabel;
+	    if (m_groupLayouts.find(groupName) == m_groupLayouts.end()) {
+                labelWidget = new QLabel(propertyLabel, m_mainWidget);
+            }
+        }
+        
+        if (labelWidget) {
+            m_layout->addWidget(labelWidget, row, 0);
+            QWidget *frame = new QWidget(m_mainWidget);
+            frame->setMinimumSize(WidgetScale::scaleQSize(QSize(1, 24)));
+            m_groupLayouts[groupName] = new QGridLayout;
+#ifdef Q_OS_MAC
+            // Seems to be plenty of whitespace already
+            m_groupLayouts[groupName]->setContentsMargins(0, 0, 0, 0);
+#else
+            // Need a bit of padding on the left
+            m_groupLayouts[groupName]->setContentsMargins
+                (WidgetScale::scalePixelSize(10), 0, 0, 0);
 #endif
-		m_layout->addWidget(new QLabel(groupName, m_mainWidget), row, 0);
-		QFrame *frame = new QFrame(m_mainWidget);
-		m_layout->addWidget(frame, row, 1, 1, 2);
-		m_groupLayouts[groupName] = new QGridLayout;
-		m_groupLayouts[groupName]->setMargin(0);
-		frame->setLayout(m_groupLayouts[groupName]);
-	    }
-	} else {
-#ifdef DEBUG_PROPERTY_BOX 
-	    cerr << "PropertyBox: adding label \"" << propertyLabel << "\"" << endl;
-#endif
-	    m_layout->addWidget(new QLabel(propertyLabel, m_mainWidget), row, 0);
-	}
+            frame->setLayout(m_groupLayouts[groupName]);
+            m_layout->addWidget(frame, row, 1, 1, 2);
+            m_layout->setColumnStretch(1, 10);
+        }
     }
 
     switch (type) {
@@ -318,7 +297,7 @@
         QAbstractButton *button = 0;
 
 	if (have) {
-            button = dynamic_cast<QAbstractButton *>(m_propertyControllers[name]);
+            button = qobject_cast<QAbstractButton *>(m_propertyControllers[name]);
             assert(button);
 	} else {
 #ifdef DEBUG_PROPERTY_BOX 
@@ -330,7 +309,7 @@
                 QIcon icon(IconLoader().load(iconName));
                 button->setIcon(icon);
                 button->setObjectName(name);
-                button->setFixedSize(QSize(18, 18));
+                button->setFixedSize(WidgetScale::scaleQSize(QSize(18, 18)));
             } else {
                 button = new NotifyingCheckBox();
                 button->setObjectName(name);
@@ -341,13 +320,9 @@
                     this, SLOT(mouseEnteredWidget()));
             connect(button, SIGNAL(mouseLeft()),
                     this, SLOT(mouseLeftWidget()));
-	    if (inGroup) {
-		button->setToolTip(propertyLabel);
-		m_groupLayouts[groupName]->addWidget
-                    (button, 0, m_groupLayouts[groupName]->columnCount());
-	    } else {
-		m_layout->addWidget(button, row, 1, 1, 2);
-	    }
+            button->setToolTip(propertyLabel);
+            m_groupLayouts[groupName]->addWidget
+                (button, 0, m_groupLayouts[groupName]->columnCount());
 	    m_propertyControllers[name] = button;
 	}
 
@@ -364,7 +339,7 @@
 	AudioDial *dial;
 
 	if (have) {
-	    dial = dynamic_cast<AudioDial *>(m_propertyControllers[name]);
+	    dial = qobject_cast<AudioDial *>(m_propertyControllers[name]);
 	    assert(dial);
             if (rangeChanged) {
                 dial->blockSignals(true);
@@ -396,21 +371,10 @@
             connect(dial, SIGNAL(mouseLeft()),
                     this, SLOT(mouseLeftWidget()));
 
-	    if (inGroup) {
-		dial->setFixedWidth(24);
-		dial->setFixedHeight(24);
-		m_groupLayouts[groupName]->addWidget
-                    (dial, 0, m_groupLayouts[groupName]->columnCount());
-	    } else {
-		dial->setFixedWidth(32);
-		dial->setFixedHeight(32);
-		m_layout->addWidget(dial, row, 1);
-		QLabel *label = new QLabel(m_mainWidget);
-		connect(dial, SIGNAL(valueChanged(int)),
-			label, SLOT(setNum(int)));
-		label->setNum(value);
-		m_layout->addWidget(label, row, 2);
-	    }
+            dial->setFixedWidth(WidgetScale::scalePixelSize(24));
+            dial->setFixedHeight(WidgetScale::scalePixelSize(24));
+            m_groupLayouts[groupName]->addWidget
+                (dial, 0, m_groupLayouts[groupName]->columnCount());
 
 	    m_propertyControllers[name] = dial;
 	}
@@ -423,14 +387,85 @@
 	break;
     }
 
+    case PropertyContainer::ColourProperty:
+    {
+        ColourComboBox *cb;
+        
+	if (have) {
+	    cb = qobject_cast<ColourComboBox *>(m_propertyControllers[name]);
+	    assert(cb);
+	} else {
+#ifdef DEBUG_PROPERTY_BOX 
+	    cerr << "PropertyBox: creating new colour combobox" << endl;
+#endif
+            cb = new ColourComboBox(true);
+            cb->setObjectName(name);
+
+	    connect(cb, SIGNAL(colourChanged(int)),
+		    this, SLOT(propertyControllerChanged(int)));
+            connect(cb, SIGNAL(mouseEntered()),
+                    this, SLOT(mouseEnteredWidget()));
+            connect(cb, SIGNAL(mouseLeft()),
+                    this, SLOT(mouseLeftWidget()));
+
+            cb->setToolTip(propertyLabel);
+            m_groupLayouts[groupName]->addWidget
+                (cb, 0, m_groupLayouts[groupName]->columnCount());
+	    m_propertyControllers[name] = cb;
+	}
+
+        if (cb->currentIndex() != value) {
+            cb->blockSignals(true);
+            cb->setCurrentIndex(value);
+            cb->blockSignals(false);
+        }
+
+        break;
+    }        
+
+    case PropertyContainer::ColourMapProperty:
+    {
+        ColourMapComboBox *cb;
+        
+	if (have) {
+	    cb = qobject_cast<ColourMapComboBox *>(m_propertyControllers[name]);
+	    assert(cb);
+	} else {
+#ifdef DEBUG_PROPERTY_BOX 
+	    cerr << "PropertyBox: creating new colourmap combobox" << endl;
+#endif
+            cb = new ColourMapComboBox(false);
+            cb->setObjectName(name);
+
+	    connect(cb, SIGNAL(colourMapChanged(int)),
+		    this, SLOT(propertyControllerChanged(int)));
+            connect(cb, SIGNAL(mouseEntered()),
+                    this, SLOT(mouseEnteredWidget()));
+            connect(cb, SIGNAL(mouseLeft()),
+                    this, SLOT(mouseLeftWidget()));
+
+            cb->setToolTip(propertyLabel);
+            m_groupLayouts[groupName]->addWidget
+                (cb, 0, m_groupLayouts[groupName]->columnCount());
+	    m_propertyControllers[name] = cb;
+	}
+
+        if (cb->currentIndex() != value) {
+            cb->blockSignals(true);
+            cb->setCurrentIndex(value);
+            cb->blockSignals(false);
+        }
+
+        break;
+    }        
+
     case PropertyContainer::ValueProperty:
     case PropertyContainer::UnitsProperty:
-    case PropertyContainer::ColourProperty:
     {
 	NotifyingComboBox *cb;
 
 	if (have) {
-	    cb = dynamic_cast<NotifyingComboBox *>(m_propertyControllers[name]);
+	    cb = qobject_cast<NotifyingComboBox *>(m_propertyControllers[name]);
 	    assert(cb);
 	} else {
 #ifdef DEBUG_PROPERTY_BOX 
@@ -463,7 +498,7 @@
                     }
                 }
 
-            } else if (type == PropertyContainer::UnitsProperty) {
+            } else { // PropertyContainer::UnitsProperty
 
                 QStringList units = UnitDatabase::getInstance()->getKnownUnits();
                 for (int i = 0; i < units.size(); ++i) {
@@ -471,26 +506,6 @@
                 }
 
                 cb->setEditable(true);
-
-            } else { // ColourProperty
-
-                //!!! should be a proper colour combobox class that
-                // manages its own Add New Colour entry...
-
-                int size = (QFontMetrics(QFont()).height() * 2) / 3;
-                if (size < 12) size = 12;
-                
-                ColourDatabase *db = ColourDatabase::getInstance();
-                for (int i = 0; i < db->getColourCount(); ++i) {
-                    QString name = db->getColourName(i);
-                    cb->addItem(db->getExamplePixmap(i, QSize(size, size)), name);
-                }
-                cb->addItem(tr("Add New Colour..."));
-            }                
-                
-            cb->blockSignals(false);
-            if (cb->count() < 20 && cb->count() > cb->maxVisibleItems()) {
-                cb->setMaxVisibleItems(cb->count());
             }
         }
 
@@ -502,19 +517,14 @@
             connect(cb, SIGNAL(mouseLeft()),
                     this, SLOT(mouseLeftWidget()));
 
-	    if (inGroup) {
-		cb->setToolTip(propertyLabel);
-		m_groupLayouts[groupName]->addWidget
-                    (cb, 0, m_groupLayouts[groupName]->columnCount());
-	    } else {
-		m_layout->addWidget(cb, row, 1, 1, 2);
-	    }
+            cb->setToolTip(propertyLabel);
+            m_groupLayouts[groupName]->addWidget
+                (cb, 0, m_groupLayouts[groupName]->columnCount());
 	    m_propertyControllers[name] = cb;
 	}
 
         cb->blockSignals(true);
-        if (type == PropertyContainer::ValueProperty ||
-            type == PropertyContainer::ColourProperty) {
+        if (type == PropertyContainer::ValueProperty) {
             if (cb->currentIndex() != value) {
                 cb->setCurrentIndex(value);
             }
@@ -531,13 +541,6 @@
         }
         cb->blockSignals(false);
 
-#ifdef Q_OS_MAC
-	// Crashes on startup without this, for some reason; also
-	// prevents combo boxes from getting weirdly squished
-	// vertically
-	cb->setMinimumSize(QSize(10, cb->font().pixelSize() * 2));
-#endif
-
 	break;
     }
 
@@ -605,22 +608,6 @@
 }    
 
 void
-PropertyBox::colourDatabaseChanged()
-{
-    blockSignals(true);
-
-    PropertyContainer::PropertyList properties = m_container->getProperties();
-    for (size_t i = 0; i < properties.size(); ++i) {
-        if (m_container->getPropertyType(properties[i]) ==
-            PropertyContainer::ColourProperty) {
-            updatePropertyEditor(properties[i], true);
-        }
-    }
-
-    blockSignals(false);
-}    
-
-void
 PropertyBox::propertyControllerChanged(bool on)
 {
     propertyControllerChanged(on ? 1 : 0);
@@ -642,24 +629,13 @@
 
     if (type == PropertyContainer::UnitsProperty) {
 
-        NotifyingComboBox *cb = dynamic_cast<NotifyingComboBox *>(obj);
+        NotifyingComboBox *cb = qobject_cast<NotifyingComboBox *>(obj);
         if (cb) {
             QString unit = cb->currentText();
             c = m_container->getSetPropertyCommand
                 (name, UnitDatabase::getInstance()->getUnitId(unit));
         }
 
-    } else if (type == PropertyContainer::ColourProperty) {
-
-        if (value == int(ColourDatabase::getInstance()->getColourCount())) {
-            addNewColour();
-            if (value == int(ColourDatabase::getInstance()->getColourCount())) {
-                propertyContainerPropertyChanged(m_container);
-                return;
-            }
-        }
-        c = m_container->getSetPropertyCommand(name, value);
-
     } else if (type != PropertyContainer::InvalidProperty) {
 
 	c = m_container->getSetPropertyCommand(name, value);
@@ -671,27 +647,9 @@
 }
 
 void
-PropertyBox::addNewColour()
-{
-    QColor newColour = QColorDialog::getColor();
-    if (!newColour.isValid()) return;
-
-    ColourNameDialog dialog(tr("Name New Colour"),
-                            tr("Enter a name for the new colour:"),
-                            newColour, newColour.name(), this);
-    dialog.showDarkBackgroundCheckbox(tr("Prefer black background for this colour"));
-    if (dialog.exec() == QDialog::Accepted) {
-        //!!! command
-        ColourDatabase *db = ColourDatabase::getInstance();
-        int index = db->addColour(newColour, dialog.getColourName());
-        db->setUseDarkBackground(index, dialog.isDarkBackgroundChecked());
-    }
-}
-
-void
 PropertyBox::playAudibleChanged(bool audible)
 {
-    m_playButton->setState(audible);
+    m_playButton->setChecked(audible);
 }
 
 void
@@ -707,26 +665,15 @@
         CommandHistory::getInstance()->addCommand(command, true, true);
     }
 }
-    
-void
-PropertyBox::playGainChanged(float gain)
-{
-    int dialValue = int(lrint(log10(gain) * 20.0));
-    if (dialValue < -50) dialValue = -50;
-    if (dialValue >  50) dialValue =  50;
-    emit changePlayGainDial(dialValue);
-}
 
 void
-PropertyBox::playGainDialChanged(int dialValue)
+PropertyBox::playGainControlChanged(float gain)
 {
     QObject *obj = sender();
 
     PlayParameters *params = m_container->getPlayParameters();
     if (!params) return;
 
-    float gain = float(pow(10, float(dialValue) / 20.0));
-
     if (params->getPlayGain() != gain) {
         PlayParameterRepository::EditCommand *command =
             new PlayParameterRepository::EditCommand(params);
@@ -736,28 +683,15 @@
 
     updateContextHelp(obj);
 }
-    
-void
-PropertyBox::playPanChanged(float pan)
-{
-    int dialValue = int(lrint(pan * 50.0));
-    if (dialValue < -50) dialValue = -50;
-    if (dialValue >  50) dialValue =  50;
-    emit changePlayPanDial(dialValue);
-}
 
 void
-PropertyBox::playPanDialChanged(int dialValue)
+PropertyBox::playPanControlChanged(float pan)
 {
     QObject *obj = sender();
 
     PlayParameters *params = m_container->getPlayParameters();
     if (!params) return;
 
-    float pan = float(dialValue) / 50.f;
-    if (pan < -1.f) pan = -1.f;
-    if (pan >  1.f) pan =  1.f;
-
     if (params->getPlayPan() != pan) {
         PlayParameterRepository::EditCommand *command =
             new PlayParameterRepository::EditCommand(params);
@@ -842,17 +776,34 @@
 void
 PropertyBox::updateContextHelp(QObject *o)
 {
-    QWidget *w = dynamic_cast<QWidget *>(o);
+    QWidget *w = qobject_cast<QWidget *>(o);
     if (!w) return;
 
     if (!m_container) return;
     QString cname = m_container->getPropertyContainerName();
     if (cname == "") return;
 
+    LevelPanToolButton *lp = qobject_cast<LevelPanToolButton *>(w);
+    if (lp) {
+        emit contextHelpChanged(tr("Adjust playback level and pan of %1").arg(cname));
+        return;
+    }
+
     QString wname = w->objectName();
 
+    if (wname == "playParamButton") {
+        PlayParameters *params = m_container->getPlayParameters();
+        if (params) {
+            emit contextHelpChanged
+                (tr("Change sound used for playback (currently \"%1\")")
+                 .arg(params->getPlayClipId()));
+            return;
+        }
+    }
+    
     QString extraText;
-    AudioDial *dial = dynamic_cast<AudioDial *>(w);
+    
+    AudioDial *dial = qobject_cast<AudioDial *>(w);
     if (dial) {
         double mv = dial->mappedValue();
         QString unit = "";
@@ -870,7 +821,7 @@
         emit contextHelpChanged(tr("Toggle Playback of %1").arg(cname));
     } else if (wname == "") {
         return;
-    } else if (dynamic_cast<QAbstractButton *>(w)) {
+    } else if (qobject_cast<QAbstractButton *>(w)) {
         emit contextHelpChanged(tr("Toggle %1 property of %2")
                                 .arg(wname).arg(cname));
     } else {