Implement Privacy Screen

* Add handles for window focus gained / focus lossed and connect to timer
* Clean up some of the PrivacyScreen.qml code
* Connect settings to PrivacyScreen visibility

src/ChatPage.cpp

@@ -312,6 +312,8 @@ ChatPage::ChatPage(QSharedPointer<UserSettings> userSettings, QWidget *parent)
                 &ChatPage::initializeMentions,
                 user_mentions_popup_,
                 &popups::UserMentions::initializeMentions);
+        connect(
+          this, &ChatPage::chatFocusChanged, view_manager_, &TimelineViewManager::chatFocusChanged);
         connect(this, &ChatPage::syncUI, this, [this](const mtx::responses::Rooms &rooms) {
                 try {
                         room_list_->cleanupInvites(cache::invites());

src/ChatPage.h

@@ -127,7 +127,6 @@ public slots:
         void receivedSessionKey(const std::string &room_id, const std::string &session_id);
         void decryptDownloadedSecrets(mtx::secret_storage::AesHmacSha2KeyDescription keyDesc,
                                       const SecretsToDecrypt &secrets);
-
 signals:
         void connectionLost();
         void connectionRestored();
@@ -176,6 +175,7 @@ signals:
         void retrievedPresence(const QString &statusMsg, mtx::presence::PresenceState state);
         void themeChanged();
         void decryptSidebarChanged();
+        void chatFocusChanged(const bool focused);
 
         //! Signals for device verificaiton
         void receivedDeviceVerificationAccept(

src/MainWindow.cpp

@@ -130,6 +130,9 @@ MainWindow::MainWindow(QWidget *parent)
                 SLOT(iconActivated(QSystemTrayIcon::ActivationReason)));
 
         connect(chat_page_, SIGNAL(contentLoaded()), this, SLOT(removeOverlayProgressBar()));
+
+        connect(this, &MainWindow::focusChanged, chat_page_, &ChatPage::chatFocusChanged);
+
         connect(
           chat_page_, &ChatPage::showUserSettingsPage, this, &MainWindow::showUserSettingsPage);
 
@@ -204,6 +207,19 @@ MainWindow::resizeEvent(QResizeEvent *event)
         QMainWindow::resizeEvent(event);
 }
 
+bool
+MainWindow::event(QEvent *event)
+{
+        auto type = event->type();
+        if (type == QEvent::WindowActivate) {
+                emit focusChanged(true);
+        } else if (type == QEvent::WindowDeactivate) {
+                emit focusChanged(false);
+        }
+
+        return QMainWindow::event(event);
+}
+
 void
 MainWindow::adjustSideBars()
 {

src/MainWindow.h

@@ -88,6 +88,7 @@ protected:
         void closeEvent(QCloseEvent *event) override;
         void resizeEvent(QResizeEvent *event) override;
         void showEvent(QShowEvent *event) override;
+        bool event(QEvent *event) override;
 
 private slots:
         //! Show or hide the sidebars based on window's size.
@@ -115,6 +116,9 @@ private slots:
 
         virtual void setWindowTitle(int notificationCount);
 
+signals:
+        void focusChanged(const bool focused);
+
 private:
         bool loadJdenticonPlugin();
 

src/UserSettingsPage.cpp

@@ -836,13 +836,15 @@ UserSettingsPage::UserSettingsPage(QSharedPointer<UserSettings> settings, QWidge
                 decryptSidebar_,
                 tr("Decrypt the messages shown in the sidebar.\nOnly affects messages in "
                    "encrypted chats."));
-        boxWrap(tr("Encrypted chat privacy screen"),
+        boxWrap(tr("Privacy Screen"),
                 privacyScreen_,
                 tr("When the window loses focus, the timeline will\nbe blurred."));
-        boxWrap(tr("Privacy screen timeout"),
-                privacyScreenTimeout_,
-                tr("Set timeout for how long after window loses\nfocus before the screen"
-                   " will be blurred.\nSet to 0 to blur immediately after focus loss."));
+        boxWrap(
+          tr("Privacy screen timeout"),
+          privacyScreenTimeout_,
+          tr("Set timeout (in seconds) for how long after window loses\nfocus before the screen"
+             " will be blurred.\nSet to 0 to blur immediately after focus loss. Max value of 1 "
+             "hour (3600 seconds)"));
         boxWrap(tr("Show buttons in timeline"),
                 timelineButtonsToggle_,
                 tr("Show buttons to quickly reply, react or access additional options next to each "

src/timeline/TimelineViewManager.h

@@ -36,6 +36,8 @@ class TimelineViewManager : public QObject
           bool isInitialSync MEMBER isInitialSync_ READ isInitialSync NOTIFY initialSyncChanged)
         Q_PROPERTY(
           bool isNarrowView MEMBER isNarrowView_ READ isNarrowView NOTIFY narrowViewChanged)
+        Q_PROPERTY(
+          bool isWindowFocused MEMBER isWindowFocused_ READ isWindowFocused NOTIFY focusChanged)
 
 public:
         TimelineViewManager(CallManager *callManager, ChatPage *parent = nullptr);
@@ -54,6 +56,7 @@ public:
         Q_INVOKABLE TimelineModel *activeTimeline() const { return timeline_; }
         Q_INVOKABLE bool isInitialSync() const { return isInitialSync_; }
         bool isNarrowView() const { return isNarrowView_; }
+        bool isWindowFocused() const { return isWindowFocused_; }
         Q_INVOKABLE void openImageOverlay(QString mxcUrl, QString eventId) const;
         Q_INVOKABLE QColor userColor(QString id, QColor background);
         Q_INVOKABLE QString escapeEmoji(QString str) const;
@@ -83,11 +86,17 @@ signals:
         void inviteUsers(QStringList users);
         void showRoomList();
         void narrowViewChanged();
+        void focusChanged();
 
 public slots:
         void updateReadReceipts(const QString &room_id, const std::vector<QString> &event_ids);
         void receivedSessionKey(const std::string &room_id, const std::string &session_id);
         void initWithMessages(const std::vector<QString> &roomIds);
+        void chatFocusChanged(bool focused)
+        {
+                isWindowFocused_ = focused;
+                emit focusChanged();
+        }
 
         void setHistoryView(const QString &room_id);
         TimelineModel *getHistoryView(const QString &room_id)
@@ -145,8 +154,9 @@ private:
         TimelineModel *timeline_  = nullptr;
         CallManager *callManager_ = nullptr;
 
-        bool isInitialSync_ = true;
-        bool isNarrowView_  = false;
+        bool isInitialSync_   = true;
+        bool isNarrowView_    = false;
+        bool isWindowFocused_ = false;
 
         QHash<QString, QColor> userColors;