A basic TabletModeManager

Summary:
depends from D9521

listens to switch events and updates the tablet mode status
which is exposed to dbus in the org.kde.KWin.TabletModeManager
interface

Test Plan:
as hardware support is limited, testing of clients
so far is done by the setter in the dbus property,
which should be removed from the final version.
It has been tested to successfully work on a Thinkpad.

Reviewers: #plasma, #kwin, graesslin

Reviewed By: #plasma, #kwin, graesslin

Subscribers: graesslin, davidedmundson, plasma-devel, kwin, #kwin

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D9764

CMakeLists.txt

@@ -667,7 +667,7 @@ install(TARGETS kwin             ${INSTALL_TARGETS_DEFAULT_ARGS} LIBRARY NAMELIN
 install(TARGETS kdeinit_kwin_x11 ${INSTALL_TARGETS_DEFAULT_ARGS} )
 install(TARGETS kwin_x11         ${INSTALL_TARGETS_DEFAULT_ARGS} )
 
-add_executable(kwin_wayland main_wayland.cpp)
+add_executable(kwin_wayland tabletmodemanager.cpp main_wayland.cpp)
 target_link_libraries(kwin_wayland kwin)
 if (HAVE_LIBCAP)
     target_link_libraries(kwin_wayland ${Libcap_LIBRARIES})

main_wayland.cpp

@@ -25,6 +25,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 // kwin
 #include "platform.h"
 #include "effects.h"
+#include "tabletmodemanager.h"
 #include "wayland_server.h"
 #include "xcbutils.h"
 
@@ -168,6 +169,7 @@ void ApplicationWayland::performStartup()
 
     VirtualKeyboard::create(this);
     createBackend();
+    TabletModeManager::create(this);
 }
 
 void ApplicationWayland::createBackend()

tabletmodemanager.cpp

@@ -0,0 +1,103 @@
+/*
+ * Copyright 2018 Marco Martin <mart@kde.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License or (at your option) version 3 or any later version
+ * accepted by the membership of KDE e.V. (or its successor approved
+ * by the membership of KDE e.V.), which shall act as a proxy
+ * defined in Section 14 of version 3 of the license.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "tabletmodemanager.h"
+#include "input.h"
+#include "input_event.h"
+#include "input_event_spy.h"
+
+#if HAVE_INPUT
+#include "libinput/device.h"
+#endif
+
+#include <QDBusConnection>
+
+using namespace KWin;
+
+KWIN_SINGLETON_FACTORY_VARIABLE(TabletModeManager, s_manager)
+
+class KWin::TabletModeInputEventSpy : public InputEventSpy
+{
+public:
+    explicit TabletModeInputEventSpy(TabletModeManager *parent);
+
+    void switchEvent(SwitchEvent *event) override;
+private:
+    TabletModeManager *m_parent;
+};
+
+TabletModeInputEventSpy::TabletModeInputEventSpy(TabletModeManager *parent)
+    : m_parent(parent)
+{
+}
+
+void TabletModeInputEventSpy::switchEvent(SwitchEvent *event)
+{
+    if (!event->device()->isTabletModeSwitch()) {
+        return;
+    }
+
+    switch (event->state()) {
+    case SwitchEvent::State::Off:
+        m_parent->setIsTablet(false);
+        break;
+    case SwitchEvent::State::On:
+        m_parent->setIsTablet(true);
+        break;
+    default:
+        Q_UNREACHABLE();
+    }
+}
+
+
+
+TabletModeManager::TabletModeManager(QObject *parent)
+    : QObject(parent),
+      m_spy(new TabletModeInputEventSpy(this))
+{
+    input()->installInputEventSpy(m_spy);
+
+    QDBusConnection::sessionBus().registerObject(QStringLiteral("/org/kde/KWin"),
+                                                 QStringLiteral("org.kde.KWin.TabletModeManager"),
+                                                 this,
+                                                 QDBusConnection::ExportAllProperties | QDBusConnection::ExportAllSignals
+    );
+}
+
+TabletModeManager::~TabletModeManager()
+{
+    delete m_spy;
+}
+
+bool TabletModeManager::isTablet() const
+{
+    return m_isTabletMode;
+}
+
+void TabletModeManager::setIsTablet(bool tablet)
+{
+    if (m_isTabletMode == tablet) {
+        return;
+    }
+
+    m_isTabletMode = tablet;
+    emit tabletModeChanged(tablet);
+}

tabletmodemanager.h

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2018 Marco Martin <mart@kde.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License or (at your option) version 3 or any later version
+ * accepted by the membership of KDE e.V. (or its successor approved
+ * by the membership of KDE e.V.), which shall act as a proxy
+ * defined in Section 14 of version 3 of the license.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef KWIN_TABLETMODEMANAGER_H
+#define KWIN_TABLETMODEMANAGER_H
+
+#include <QObject>
+#include <kwinglobals.h>
+
+namespace KWin {
+
+class TabletModeInputEventSpy;
+
+class TabletModeManager : public QObject
+{
+    Q_OBJECT
+    Q_CLASSINFO("D-Bus Interface", "org.kde.KWin.TabletModeManager")
+    Q_PROPERTY(bool tabletMode READ isTablet NOTIFY tabletModeChanged)
+
+public:
+    ~TabletModeManager();
+    bool isTablet() const;
+    void setIsTablet(bool tablet);
+
+Q_SIGNALS:
+    void tabletModeChanged(bool tabletMode);
+
+private:
+    bool m_isTabletMode = false;
+    TabletModeInputEventSpy *m_spy;
+    KWIN_SINGLETON_VARIABLE(TabletModeManager, s_manager)
+};
+}
+
+#endif // KWIN_TABLETMODEMANAGER_H