The hat readings from the joystick now works correctly. Also moved some signals over to using an enum from an int type.

src/input/JoystickInput.cc

@@ -205,11 +205,18 @@ void JoystickInput::run()
 
         // Build up vectors describing the hat position
         int hatPosition = SDL_JoystickGetHat(joystick, 0);
-        if ((SDL_HAT_UP & hatPosition) > 0) yHat = 1;
-        if ((SDL_HAT_DOWN & hatPosition) > 0) yHat = -1;
-        if ((SDL_HAT_LEFT & hatPosition) > 0) xHat = -1;
-        if ((SDL_HAT_RIGHT & hatPosition) > 0) xHat = 1;
-        emit hatDirectionChanged(xHat, yHat);
+        int newYHat = 0;
+        if ((SDL_HAT_UP & hatPosition) > 0) newYHat = 1;
+        if ((SDL_HAT_DOWN & hatPosition) > 0) newYHat = -1;
+        int newXHat = 0;
+        if ((SDL_HAT_LEFT & hatPosition) > 0) newXHat = -1;
+        if ((SDL_HAT_RIGHT & hatPosition) > 0) newXHat = 1;
+        if (newYHat != yHat || newXHat != xHat)
+        {
+            xHat = newXHat;
+            yHat = newYHat;
+        }
+        emit hatDirectionChanged(newXHat, newYHat);
 
         // Emit signals for each button individually
         for (int i = 0; i < joystickNumButtons; i++)

src/ui/JoystickAxis.cc

@@ -1,4 +1,5 @@
 #include "JoystickAxis.h"
+#include "JoystickInput.h"
 #include "ui_JoystickAxis.h"
 #include <QString>
 
@@ -24,5 +25,5 @@ void JoystickAxis::setValue(float value)
 
 void JoystickAxis::mappingComboBoxChanged(int newMapping)
 {
-    emit mappingChanged(id, newMapping);
+    emit mappingChanged(id, (JoystickInput::JOYSTICK_INPUT_MAPPING)newMapping);
 }

src/ui/JoystickAxis.h

@@ -2,6 +2,7 @@
 #define JOYSTICKAXIS_H
 
 #include <QWidget>
+#include "JoystickInput.h"
 
 namespace Ui {
 class JoystickAxis;
@@ -17,7 +18,7 @@ public:
 
 signals:
     /** @brief Signal a change in this axis' yaw/pitch/roll mapping */
-    void mappingChanged(int id, int newMapping);
+    void mappingChanged(int id, JoystickInput::JOYSTICK_INPUT_MAPPING newMapping);
 
 public slots:
     /** @brief Update the displayed value of the included progressbar.

src/ui/JoystickWidget.cc

@@ -21,10 +21,11 @@ JoystickWidget::JoystickWidget(JoystickInput* joystick, QWidget *parent) :
     // Initialize the UI based on the current joystick
     initUI();
 
-    // Watch for button and hat input events from the joystick.
+    // Watch for button, axis, and hat input events from the joystick.
     connect(this->joystick, SIGNAL(buttonPressed(int)), this, SLOT(joystickButtonPressed(int)));
     connect(this->joystick, SIGNAL(buttonReleased(int)), this, SLOT(joystickButtonReleased(int)));
     connect(this->joystick, SIGNAL(axisValueChanged(int,float)), this, SLOT(updateAxisValue(int,float)));
+    connect(this->joystick, SIGNAL(hatDirectionChanged(int,int)), this, SLOT(setHat(int,int)));
 
     // Update the UI if the joystick changes.
     connect(m_ui->joystickNameComboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(updateUIForJoystick(int)));
@@ -131,7 +132,7 @@ void JoystickWidget::updateUIForJoystick(int id)
     {
         JoystickAxis* axis = new JoystickAxis(i, m_ui->axesBox);
         axis->setValue(joystick->getCurrentValueForAxis(i));
-        connect(axis, SIGNAL(mappingChanged(int,int)), this, SLOT(setMappingAxis(int,int)));
+        connect(axis, SIGNAL(mappingChanged(int,JoystickInput::JOYSTICK_INPUT_MAPPING)), this, SLOT(setMappingAxis(int,JoystickInput::JOYSTICK_INPUT_MAPPING)));
         // And make sure we insert BEFORE the vertical spacer.
         m_ui->axesLayout->insertWidget(i, axis);
         axes.append(axis);
@@ -146,9 +147,9 @@ void JoystickWidget::updateAxisValue(int axis, float value)
     }
 }
 
-void JoystickWidget::setHat(float x, float y)
+void JoystickWidget::setHat(int x, int y)
 {
-    updateStatus(tr("Hat position: x: %1, y: %2").arg(x).arg(y));
+    m_ui->statusLabel->setText(tr("Hat position: x: %1, y: %2").arg(x).arg(y));
 }
 
 void JoystickWidget::setMappingAxis(int axisID, JoystickInput::JOYSTICK_INPUT_MAPPING newMapping)
@@ -167,6 +168,9 @@ void JoystickWidget::setMappingAxis(int axisID, JoystickInput::JOYSTICK_INPUT_MA
         case JoystickInput::JOYSTICK_INPUT_MAPPING_THROTTLE:
             joystick->setMappingThrottleAxis(axisID);
             break;
+        case JoystickInput::JOYSTICK_INPUT_MAPPING_NONE:
+        default:
+            break;
     }
 }
 
@@ -180,8 +184,3 @@ void JoystickWidget::joystickButtonReleased(int key)
 {
     buttons.at(key)->setStyleSheet("");
 }
-
-void JoystickWidget::updateStatus(const QString& status)
-{
-    m_ui->statusLabel->setText(status);
-}

src/ui/JoystickWidget.h

@@ -53,14 +53,25 @@ public:
     virtual ~JoystickWidget();
 
 public slots:
+    /** @brief Update the UI for a new joystick based on SDL ID. */
+    void updateUIForJoystick(int id);
+    /** @brief Change the stored mapping for a given axis. */
+    void setMappingAxis(int axisID, JoystickInput::JOYSTICK_INPUT_MAPPING newMapping);
+    /**
+     * @brief Update a given axis with a new value
+     * @param axis The index of the axis to update.
+     * @param value The new value for the axis, [-1.0:1.0].
+     * @see JoystickInput:axisValueChanged
+     */
     void updateAxisValue(int axis, float value);
-    void setHat(float x, float y);
+    /** @brief Update the UI with new values for the hat.
+     *  @see JoystickInput::hatDirectionChanged
+     */
+    void setHat(int x, int y);
     /** @brief Trigger a UI change based on a button being pressed */
     void joystickButtonPressed(int key);
     /** @brief Trigger a UI change based on a button being released */
     void joystickButtonReleased(int key);
-    /** @brief Update status string */
-    void updateStatus(const QString& status);
     /** @brief Update the UI color scheme when the MainWindow theme changes. */
     void styleChanged(MainWindow::QGC_MAINWINDOW_STYLE);
 
@@ -77,12 +88,6 @@ protected:
     /** @brief The color to use for button labels when their corresponding button is pressed */
     QColor buttonLabelColor;
 
-protected slots:
-    /** @brief Update the UI for a new joystick based on SDL ID. */
-    void updateUIForJoystick(int id);
-    /** @brief Change the stored mapping for a given axis. */
-    void setMappingAxis(int axisID, JoystickInput::JOYSTICK_INPUT_MAPPING newMapping);
-
 private:
     Ui::JoystickWidget *m_ui;
     /** @brief Initialize all dynamic UI elements (button list, joystick names, etc.) */