Added Unix implementation for Clipboard API

src/SFML/Window/CMakeLists.txt

@@ -76,6 +76,8 @@ if(SFML_OS_WINDOWS)
     add_definitions(-DUNICODE -D_UNICODE)
 elseif(SFML_OS_LINUX OR SFML_OS_FREEBSD)
     set(PLATFORM_SRC
+        ${SRCROOT}/Unix/ClipboardImpl.hpp
+        ${SRCROOT}/Unix/ClipboardImpl.cpp
         ${SRCROOT}/Unix/Display.cpp
         ${SRCROOT}/Unix/Display.hpp
         ${SRCROOT}/Unix/InputImpl.cpp

src/SFML/Window/Unix/ClipboardImpl.cpp

@@ -0,0 +1,261 @@
+////////////////////////////////////////////////////////////
+//
+// SFML - Simple and Fast Multimedia Library
+// Copyright (C) 2007-2017 Laurent Gomila (laurent@sfml-dev.org)
+//
+// This software is provided 'as-is', without any express or implied warranty.
+// In no event will the authors be held liable for any damages arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it freely,
+// subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented;
+//    you must not claim that you wrote the original software.
+//    If you use this software in a product, an acknowledgment
+//    in the product documentation would be appreciated but is not required.
+//
+// 2. Altered source versions must be plainly marked as such,
+//    and must not be misrepresented as being the original software.
+//
+// 3. This notice may not be removed or altered from any source distribution.
+//
+////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////
+// Headers
+////////////////////////////////////////////////////////////
+#include <SFML/Window/Unix/ClipboardImpl.hpp>
+#include <SFML/Window/Unix/Display.hpp>
+#include <SFML/System/String.hpp>
+#include <SFML/System/Sleep.hpp>
+#include <iostream>
+#include <string>
+#include <X11/Xlib.h>
+
+
+namespace
+{
+////////////////////////////////////////////////////////////
+void initClipboard();
+void* hostSelection(void*);
+
+sf::String string;
+
+pthread_mutex_t mutex;
+pthread_t host_thread;
+
+bool is_fail = false;
+bool is_init = false;
+bool is_host = false;
+
+Display* display = NULL;
+Window window = 0;
+
+Atom selection = 0;
+Atom atom_targ = 0;
+Atom atom_text = 0;
+Atom utf8_text = 0;
+int xa_string = 31;
+int xa_atom = 4;
+
+////////////////////////////////////////////////////////////
+void initClipboard()
+{
+    is_init = true;
+
+    display = XOpenDisplay(NULL);
+    int screen = DefaultScreen(display);
+    window = XCreateSimpleWindow(display, RootWindow(display, screen), 
+        0, 0, 1, 1, 0, BlackPixel(display, screen), WhitePixel(display, screen));
+
+    selection = XInternAtom(display, "CLIPBOARD", false);
+    atom_targ = XInternAtom(display, "TARGETS", false);
+    atom_text = XInternAtom(display, "TEXT", false);
+    utf8_text = XInternAtom(display, "UTF8_STRING", true);
+
+    if(utf8_text == None)
+    {
+        std::cerr << "UTF-8 format unavailable on clipboard." << std::endl;
+        utf8_text = xa_string;
+    }
+
+    if(pthread_mutex_init(&mutex, NULL))
+    {
+        is_fail = true;
+        std::cerr << "Unable to initialize mutex. Failed to initialize clipboard." << std::endl;
+        return;
+    }
+
+    if(pthread_create(&host_thread, NULL, hostSelection, NULL))
+    {
+        is_fail = true;
+        std::cerr << "Unable to create host thread. Failed to initialize clipboard." << std::endl;
+        return;
+    }
+}
+
+////////////////////////////////////////////////////////////
+void* hostSelection(void*)
+{
+    while(true)
+    {
+        if(XPending(display) && is_host)
+        {
+            XEvent event;
+
+            pthread_mutex_lock(&mutex);
+            XNextEvent(display, &event);
+            pthread_mutex_unlock(&mutex);
+
+            switch(event.type)
+            {
+                case SelectionClear:
+                {
+                    pthread_mutex_lock(&mutex);
+                    is_host = false;
+                    pthread_mutex_unlock(&mutex);
+
+                    break;
+                }
+                case SelectionRequest:
+                {
+                    if(event.xselectionrequest.selection == selection)
+                    {
+                        XSelectionRequestEvent* sel_req_event = &event.xselectionrequest;
+                        XSelectionEvent sel_event = {0};
+
+                        int result = 0;
+                        sel_event.type = SelectionNotify, 
+                        sel_event.display = sel_req_event->display, 
+                        sel_event.requestor = sel_req_event->requestor, 
+                        sel_event.selection = sel_req_event->selection, 
+                        sel_event.time = sel_req_event->time, 
+                        sel_event.target = sel_req_event->target, 
+                        sel_event.property = sel_req_event->property;
+
+                        std::basic_string<unsigned char> str = string.toUtf8();
+
+                        if(sel_event.target == atom_targ)
+                            result = XChangeProperty(sel_event.display, sel_event.requestor, 
+                                sel_event.property, xa_atom, 32, PropModeReplace, 
+                                reinterpret_cast<unsigned char*>(&utf8_text), 1);
+                        else if(sel_event.target == xa_string || sel_event.target == atom_text)
+                            result = XChangeProperty(sel_event.display, sel_event.requestor, 
+                                sel_event.property, xa_string, 8, PropModeReplace, 
+                                reinterpret_cast<unsigned char*>(&str[0]), str.size());
+                        else if(sel_event.target == utf8_text)
+                            result = XChangeProperty(sel_event.display, sel_event.requestor, 
+                                sel_event.property, utf8_text, 8, PropModeReplace, 
+                                reinterpret_cast<unsigned char*>(&str[0]), str.size());
+                        else 
+                            sel_event.property = None;
+
+                        if((result & 2) == 0)
+                            XSendEvent(display, sel_event.requestor, 0, 0, 
+                                reinterpret_cast<XEvent*>(&sel_event));
+                    }
+                    break;
+                }
+                default: break;
+            }
+        }
+        else
+            sf::sleep(sf::milliseconds(20));
+    }
+}
+}
+
+namespace sf
+{
+namespace priv
+{
+
+////////////////////////////////////////////////////////////
+String ClipboardImpl::getString()
+{
+    if(!is_init)
+        initClipboard();
+
+    if(is_fail || is_host)
+        return string;
+
+    // Dangerous! Wipes all previous events!
+    XSync(display, true);
+    XConvertSelection(display, selection, utf8_text, atom_text, window, CurrentTime);
+
+    XEvent event;
+
+    pthread_mutex_lock(&mutex);
+    XNextEvent(display, &event);
+    pthread_mutex_unlock(&mutex);
+
+    if(event.type == SelectionNotify)
+    {
+        if(event.xselection.selection != selection || event.xselection.target != utf8_text)
+        {
+            std::cerr << "Failed to convert selection." << std::endl;
+            return string;
+        }
+
+        if(event.xselection.property)
+        {
+            Atom target;
+            int format;
+            unsigned long size;
+            unsigned long byte_left;
+            unsigned char* data;
+
+            XGetWindowProperty(event.xselection.display, 
+                event.xselection.requestor, event.xselection.property, 
+                0L, (~0L), false, AnyPropertyType, 
+                &target, &format, &size, &byte_left, &data);
+
+            if(target == utf8_text)
+            {
+                std::basic_string<unsigned char> str(data, size);
+                string = sf::String::fromUtf8(str.begin(), str.end());
+
+                XFree(data);
+            }
+
+            XDeleteProperty(event.xselection.display, event.xselection.requestor, event.xselection.property);
+        }
+    }
+
+    return string;
+}
+
+
+////////////////////////////////////////////////////////////
+void ClipboardImpl::setString(const String& text)
+{
+    if(!is_init)
+        initClipboard();
+
+    if(is_fail)
+        return;
+
+    if(!is_host)
+    {
+        XSetSelectionOwner(display, selection, window, CurrentTime);
+
+        if(XGetSelectionOwner(display, selection) != window)
+        {
+            std::cerr << "Unable to get ownership of selection." << std::endl;
+            return;
+        }
+
+        pthread_mutex_lock(&mutex);
+        is_host = true;
+        pthread_mutex_unlock(&mutex);
+    }
+
+    pthread_mutex_lock(&mutex);
+    string = text;
+    pthread_mutex_unlock(&mutex);
+}
+
+} // namespace priv
+
+} // namespace sf

src/SFML/Window/Unix/ClipboardImpl.hpp

@@ -0,0 +1,77 @@
+////////////////////////////////////////////////////////////
+//
+// SFML - Simple and Fast Multimedia Library
+// Copyright (C) 2007-2017 Laurent Gomila (laurent@sfml-dev.org)
+//
+// This software is provided 'as-is', without any express or implied warranty.
+// In no event will the authors be held liable for any damages arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it freely,
+// subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented;
+//    you must not claim that you wrote the original software.
+//    If you use this software in a product, an acknowledgment
+//    in the product documentation would be appreciated but is not required.
+//
+// 2. Altered source versions must be plainly marked as such,
+//    and must not be misrepresented as being the original software.
+//
+// 3. This notice may not be removed or altered from any source distribution.
+//
+////////////////////////////////////////////////////////////
+
+#ifndef SFML_CLIPBOARDIMPLX11_HPP
+#define SFML_CLIPBOARDIMPLX11_HPP
+
+////////////////////////////////////////////////////////////
+// Headers
+////////////////////////////////////////////////////////////
+#include <SFML/System/String.hpp>
+
+
+namespace sf
+{
+namespace priv
+{
+
+////////////////////////////////////////////////////////////
+/// \brief Give access to the system clipboard
+///
+////////////////////////////////////////////////////////////
+class ClipboardImpl
+{
+public:
+
+    ////////////////////////////////////////////////////////////
+    /// \brief Get the content of the clipboard as string data
+    ///
+    /// This function returns the content of the clipboard
+    /// as a string. If the clipboard does not contain string
+    /// it returns an empty sf::String object.
+    ///
+    /// \return Current content of the clipboard
+    ///
+    ////////////////////////////////////////////////////////////
+    static String getString();
+
+    ////////////////////////////////////////////////////////////
+    /// \brief Set the content of the clipboard as string data
+    ///
+    /// This function sets the content of the clipboard as a
+    /// string.
+    ///
+    /// \param text sf::String object containing the data to be sent 
+    /// to the clipboard
+    ///
+    ////////////////////////////////////////////////////////////
+    static void setString(const String& text);
+};
+
+} // namespace priv
+
+} // namespace sf
+
+
+#endif // SFML_CLIPBOARDIMPLX11_HPP