Create a dedicated X11EventFilter for the events used by RootInfo

Summary:
Splitting out the handling from events.cpp and moves it into a
dedicated class created together with RootInfo.

Test Plan:
Test case for NET window move which goes through this
code path still passes.

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D7808

CMakeLists.txt

@@ -470,6 +470,7 @@ set(kwin_KDEINIT_SRCS
     moving_client_x11_filter.cpp
     effects_mouse_interception_x11_filter.cpp
     window_property_notify_x11_filter.cpp
+    rootinfo_filter.cpp
    )
 
 if(KWIN_BUILD_TABBOX)

events.cpp

@@ -247,16 +247,6 @@ bool Workspace::workspaceEvent(xcb_generic_event_t *e)
             && (eventType == XCB_KEY_PRESS || eventType == XCB_KEY_RELEASE))
         return false; // let Qt process it, it'll be intercepted again in eventFilter()
 
-    if (eventType == XCB_PROPERTY_NOTIFY || eventType == XCB_CLIENT_MESSAGE) {
-        NET::Properties dirtyProtocols;
-        NET::Properties2 dirtyProtocols2;
-        rootInfo()->event(e, &dirtyProtocols, &dirtyProtocols2);
-        if (dirtyProtocols & NET::DesktopNames)
-            VirtualDesktopManager::self()->save();
-        if (dirtyProtocols2 & NET::WM2DesktopLayout)
-            VirtualDesktopManager::self()->updateLayout();
-    }
-
     // events that should be handled before Clients can get them
     switch (eventType) {
     case XCB_CONFIGURE_NOTIFY:

netinfo.cpp

@@ -23,6 +23,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "netinfo.h"
 // kwin
 #include "client.h"
+#include "rootinfo_filter.h"
 #include "virtualdesktops.h"
 #include "workspace.h"
 // Qt
@@ -139,6 +140,7 @@ RootInfo::RootInfo(xcb_window_t w, const char *name, NET::Properties properties,
                    NET::States states, NET::Properties2 properties2, NET::Actions actions, int scr)
     : NETRootInfo(connection(), w, name, properties, types, states, properties2, actions, scr)
     , m_activeWindow(activeWindow())
+    , m_eventFilter(std::make_unique<RootInfoFilter>(this))
 {
 }
 

netinfo.h

@@ -26,12 +26,14 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <NETWM>
 
 #include <xcb/xcb.h>
+#include <memory>
 
 namespace KWin
 {
 
 class AbstractClient;
 class Client;
+class RootInfoFilter;
 
 /**
  * NET WM Protocol handler class
@@ -65,6 +67,7 @@ private:
     friend RootInfo *rootInfo();
 
     xcb_window_t m_activeWindow;
+    std::unique_ptr<RootInfoFilter> m_eventFilter;
 };
 
 inline RootInfo *rootInfo()

rootinfo_filter.cpp

+/********************************************************************
+ KWin - the KDE window manager
+ This file is part of the KDE project.
+
+Copyright (C) 2017 Martin Flöser <mgraesslin@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) any later version.
+
+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 "rootinfo_filter.h"
+#include "netinfo.h"
+#include "virtualdesktops.h"
+
+namespace KWin
+{
+
+RootInfoFilter::RootInfoFilter(RootInfo *parent)
+    : X11EventFilter(QVector<int>{XCB_PROPERTY_NOTIFY, XCB_CLIENT_MESSAGE})
+    , m_rootInfo(parent)
+{
+}
+
+bool RootInfoFilter::event(xcb_generic_event_t *event)
+{
+    NET::Properties dirtyProtocols;
+    NET::Properties2 dirtyProtocols2;
+    m_rootInfo->event(event, &dirtyProtocols, &dirtyProtocols2);
+    if (dirtyProtocols & NET::DesktopNames)
+        VirtualDesktopManager::self()->save();
+    if (dirtyProtocols2 & NET::WM2DesktopLayout)
+        VirtualDesktopManager::self()->updateLayout();
+    return false;
+}
+
+}

rootinfo_filter.h

+/********************************************************************
+ KWin - the KDE window manager
+ This file is part of the KDE project.
+
+Copyright (C) 2017 Martin Flöser <mgraesslin@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) any later version.
+
+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_ROOTINFO_FILTER_H
+#define KWIN_ROOTINFO_FILTER_H
+
+#include "x11eventfilter.h"
+
+namespace KWin
+{
+class RootInfo;
+
+class RootInfoFilter : public X11EventFilter
+{
+public:
+    explicit RootInfoFilter(RootInfo *parent);
+
+    bool event(xcb_generic_event_t *event) override;
+
+private:
+    RootInfo *m_rootInfo;
+};
+
+}
+
+#endif