Submitted proof of concept for a presenter plugin

Will show a cursor so we can point at interesting things on the screen during
presentations.

plugins/CMakeLists.txt

@@ -41,6 +41,11 @@ if(SAILFISHOS OR EXPERIMENTALAPP_ENABLED)
     add_subdirectory(remotesystemvolume)
 endif()
 
-# If we split notifications per plugin, in several notifyrc files, they won't 
+option(EXPERIMENTAL_PRESENTER "Enables building the experimental on-screen pointer for presentations" OFF)
+if(EXPERIMENTAL_PRESENTER)
+    add_subdirectory(presenter)
+endif()
+
+# If we split notifications per plugin, in several notifyrc files, they won't
 # appear in the same group in the Notifications KCM
 install(FILES kdeconnect.notifyrc DESTINATION ${KNOTIFYRC_INSTALL_DIR})

plugins/presenter/CMakeLists.txt

@@ -0,0 +1,9 @@
+qt5_add_resources(presenter_SRCS assets.qrc)
+
+kdeconnect_add_plugin(kdeconnect_presenter JSON kdeconnect_presenter.json SOURCES presenterplugin.cpp ${presenter_SRCS})
+target_link_libraries(kdeconnect_presenter
+    kdeconnectcore
+    Qt5::DBus
+    Qt5::Quick
+    KF5::I18n
+)

plugins/presenter/Presenter.qml

@@ -0,0 +1,94 @@
+/**
+ * Copyright 2019 Aleix Pol Gonzalez <aleixpol@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 <https://www.gnu.org/licenses/>.
+ */
+
+import QtQuick 2.5
+import QtQuick.Window 2.5
+import QtQuick.Particles 2.0
+
+Item {
+    id: root
+    anchors.fill: parent
+
+    property real xPos: 0.5
+    property real yPos: 0.5
+
+    ParticleSystem {
+        id: particles
+        width: parent.width/20
+        height: width
+
+        x: root.width * root.xPos - width/2
+        y: root.height * root.yPos - height/2
+
+        ImageParticle {
+            groups: ["center", "edge"]
+            anchors.fill: parent
+            source: "qrc:///particleresources/glowdot.png"
+            colorVariation: 0.1
+            color: "#000099FF"
+        }
+
+        Emitter {
+            anchors.fill: parent
+            group: "center"
+            emitRate: 400
+            lifeSpan: 200
+            size: 20
+            sizeVariation: 2
+            endSize: 0
+            //! [0]
+            shape: EllipseShape {fill: false}
+            velocity: TargetDirection {
+                targetX: particles.width/2
+                targetY: particles.height/2
+                proportionalMagnitude: true
+                magnitude: 0.5
+            }
+            //! [0]
+        }
+
+        Emitter {
+            anchors.fill: parent
+            group: "edge"
+            startTime: 200
+            emitRate: 200
+            lifeSpan: 20
+            size: 28
+            sizeVariation: 2
+            endSize: 16
+            shape: EllipseShape {fill: false}
+            velocity: TargetDirection {
+                targetX: particles.width/2
+                targetY: particles.height/2
+                proportionalMagnitude: true
+                magnitude: 0.1
+                magnitudeVariation: 0.1
+            }
+            acceleration: TargetDirection {
+                targetX: particles.width/2
+                targetY: particles.height/2
+                targetVariation: 200
+                proportionalMagnitude: true
+                magnitude: 0.1
+                magnitudeVariation: 0.1
+            }
+        }
+    }
+}

plugins/presenter/assets.qrc

@@ -0,0 +1,7 @@
+<!DOCTYPE RCC>
+
+<RCC version="1.0">
+<qresource prefix="/presenter">
+    <file>Presenter.qml</file>
+</qresource>
+</RCC>

plugins/presenter/kdeconnect_presenter.json

@@ -0,0 +1,21 @@
+{
+    "KPlugin": {
+        "Authors": [
+            {
+                "Email": "aleixpol@kde.org",
+                "Name": "Aleix Pol"
+            }
+        ],
+        "Description": "",
+        "EnabledByDefault": true,
+        "Icon": "view-presentation",
+        "Id": "kdeconnect_presenter",
+        "License": "GPL",
+        "Name": "Presenter",
+        "ServiceTypes": [ "KdeConnect/Plugin" ]
+    },
+    "X-KdeConnect-OutgoingPacketType": [],
+    "X-KdeConnect-SupportedPacketType": [
+        "kdeconnect.presenter"
+    ]
+}

plugins/presenter/presenterplugin.cpp

@@ -0,0 +1,93 @@
+/**
+ * Copyright 2019 Aleix Pol Gonzalez <aleixpol@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 <https://www.gnu.org/licenses/>.
+ */
+
+#include "presenterplugin.h"
+
+#include <KLocalizedString>
+#include <KPluginFactory>
+
+#include <QDebug>
+#include <QDBusConnection>
+#include <QLoggingCategory>
+#include <QQuickView>
+#include <QQmlError>
+#include <QQuickItem>
+
+#include <core/device.h>
+#include <core/daemon.h>
+#include <QScreen>
+
+K_PLUGIN_CLASS_WITH_JSON(PresenterPlugin, "kdeconnect_presenter.json")
+
+Q_LOGGING_CATEGORY(KDECONNECT_PLUGIN_PRESENT, "kdeconnect.plugin.presenter")
+
+class PresenterView : public QQuickView
+{
+public:
+    PresenterView() {
+        setFlags(flags() | Qt::WindowFlags(Qt::WA_TranslucentBackground));
+        setClearBeforeRendering(true);
+        setColor(QColor(Qt::transparent));
+
+        setResizeMode(QQuickView::SizeViewToRootObject);
+        setSource(QUrl(QStringLiteral("qrc:/presenter/Presenter.qml")));
+
+        const auto ourErrors = errors();
+        for (const auto &error : ourErrors) {
+            qCWarning(KDECONNECT_PLUGIN_PRESENT) << "error" << error.description() << error.url() << error.line() << error.column();
+        }
+    }
+};
+
+PresenterPlugin::PresenterPlugin(QObject* parent, const QVariantList& args)
+    : KdeConnectPlugin(parent, args)
+    , m_view(nullptr)
+    , m_timer(new QTimer(this))
+{
+    m_timer->setInterval(2000);
+    m_timer->setSingleShot(true);
+}
+
+PresenterPlugin::~PresenterPlugin()
+{
+}
+
+bool PresenterPlugin::receivePacket(const NetworkPacket& np)
+{
+    if (!m_view) {
+        m_view = new PresenterView;
+        m_view->showFullScreen();
+        connect(this, &QObject::destroyed, m_view, &QObject::deleteLater);
+        connect(m_timer, &QTimer::timeout, m_view, &QObject::deleteLater);
+    }
+
+    auto screenSize = m_view->screen()->size();
+    auto ratio = screenSize.width()/screenSize.height();
+
+    m_timer->start();
+
+    auto object = m_view->rootObject();
+    object->setProperty("xPos", np.get<qreal>(QStringLiteral("px"))/2 + 0.5);
+    object->setProperty("yPos", np.get<qreal>(QStringLiteral("py"))/2 + 0.5);
+    return true;
+}
+
+#include "presenterplugin.moc"
+

plugins/presenter/presenterplugin.h

@@ -0,0 +1,52 @@
+/**
+ * Copyright 2019 Aleix Pol Gonzalez <aleixpol@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 <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef PRESENTERPLUGIN_H
+#define PRESENTERPLUGIN_H
+
+#include <QObject>
+#include <QPointer>
+#include <QTimer>
+
+#include <core/kdeconnectplugin.h>
+
+#define PACKET_TYPE_PRESENTER QStringLiteral("kdeconnect.presenter")
+
+class PresenterView;
+
+class Q_DECL_EXPORT PresenterPlugin
+    : public KdeConnectPlugin
+{
+    Q_OBJECT
+    Q_CLASSINFO("D-Bus Interface", "org.kde.kdeconnect.device.presenter")
+
+public:
+    explicit PresenterPlugin(QObject* parent, const QVariantList& args);
+    ~PresenterPlugin() override;
+
+    bool receivePacket(const NetworkPacket& np) override;
+    void connected() override {}
+
+private:
+    QPointer<PresenterView> m_view;
+    QTimer* m_timer;
+};
+
+#endif

plugins/presenter/test.qml

@@ -0,0 +1,21 @@
+import QtQuick 2.10
+
+Rectangle
+{
+    color: "red"
+    width: 500
+    height: 500
+
+    MouseArea {
+        id: mouse
+        anchors.fill: parent
+        hoverEnabled: true
+    }
+
+    Presenter {
+        anchors.fill: parent
+
+        xPos: mouse.mouseX/width
+        yPos: mouse.mouseY/height
+    }
+}