Add a spinbox to specify the number of pen buttons

It was only after building this feature, that it makes no sense as we
don't interact with libwacom yet. Oops?

devicemanager.cpp

@@ -44,6 +44,20 @@ void DeviceManager::setPad(bool pad)
     }
 }
 
+int DeviceManager::penButtons() const
+{
+    return m_penButtons;
+}
+
+void DeviceManager::setPenButtons(int num)
+{
+    if (m_penButtons != num)
+    {
+        m_penButtons = num;
+        Q_EMIT penButtonsChanged();
+    }
+}
+
 void DeviceManager::recreateDevice()
 {
     destroyDevice();
@@ -78,9 +92,15 @@ void DeviceManager::recreateDevice()
     libevdev_enable_event_type(dev, EV_KEY);
     if (!m_pad)
     {
+        if (m_penButtons >= 1) {
             libevdev_enable_event_code(dev, EV_KEY, BTN_TOOL_PEN, NULL);
+        }
+        if (m_penButtons >= 2) {
             libevdev_enable_event_code(dev, EV_KEY, BTN_TOOL_RUBBER, NULL);
+        }
+        if (m_penButtons >= 3) {
             libevdev_enable_event_code(dev, EV_KEY, BTN_TOUCH, NULL);
+        }
         libevdev_enable_event_code(dev, EV_KEY, BTN_STYLUS, NULL);
 
         libevdev_enable_event_type(dev, EV_ABS);

devicemanager.h

@@ -14,6 +14,7 @@ class DeviceManager : public QObject {
     Q_PROPERTY(QString name WRITE setName READ name NOTIFY nameChanged)
     Q_PROPERTY(bool direct WRITE setDirect READ direct NOTIFY directChanged)
     Q_PROPERTY(bool pad WRITE setPad READ pad NOTIFY padChanged)
+    Q_PROPERTY(int penButtons WRITE setPenButtons READ penButtons NOTIFY penButtonsChanged)
 
 public:
     ~DeviceManager() override;
@@ -27,6 +28,9 @@ public:
     bool pad() const;
     void setPad(bool pad);
 
+    int penButtons() const;
+    void setPenButtons(int num);
+
 public Q_SLOTS:
     void recreateDevice();
     void testButton();
@@ -35,6 +39,7 @@ Q_SIGNALS:
     void nameChanged();
     void directChanged();
     void padChanged();
+    void penButtonsChanged();
 
 private:
     void destroyDevice();
@@ -49,4 +54,5 @@ private:
     QString m_name;
     bool m_direct = false;
     bool m_pad = false;
+    int m_penButtons = 3;
 };

ui/Main.qml

@@ -33,6 +33,14 @@ Kirigami.ApplicationWindow {
                 onTextChanged: deviceManager.name = text
             }
 
+            FormCard.FormSpinBoxDelegate {
+                label: "Pen Buttons"
+                from: 0
+                to: 3
+                value: deviceManager.penButtons
+                onValueChanged: deviceManager.penButtons = value
+            }
+
             FormCard.FormDelegateSeparator {}
 
             FormCard.FormCheckDelegate {