Wayland backend: Add support for copy to clipboard

glfw/wl_init.c

@@ -593,6 +593,14 @@ static void registryHandleGlobal(void* data,
                              &zwp_idle_inhibit_manager_v1_interface,
                              1);
     }
+    else if (strcmp(interface, "wl_data_device_manager") == 0)
+    {
+        _glfw.wl.dataDeviceManager =
+            wl_registry_bind(registry, name,
+                             &wl_data_device_manager_interface,
+                             1);
+    }
+
 }
 
 static void registryHandleGlobalRemove(void *data,
@@ -761,6 +769,12 @@ void _glfwPlatformTerminate(void)
         zwp_pointer_constraints_v1_destroy(_glfw.wl.pointerConstraints);
     if (_glfw.wl.idleInhibitManager)
         zwp_idle_inhibit_manager_v1_destroy(_glfw.wl.idleInhibitManager);
+    if (_glfw.wl.dataSourceForClipboard)
+        wl_data_source_destroy(_glfw.wl.dataSourceForClipboard);
+    if (_glfw.wl.dataDevice)
+        wl_data_device_destroy(_glfw.wl.dataDevice);
+    if (_glfw.wl.dataDeviceManager)
+        wl_data_device_manager_destroy(_glfw.wl.dataDeviceManager);
     if (_glfw.wl.registry)
         wl_registry_destroy(_glfw.wl.registry);
     if (_glfw.wl.display)
@@ -769,6 +783,7 @@ void _glfwPlatformTerminate(void)
         wl_display_disconnect(_glfw.wl.display);
     }
     closeFds(_glfw.wl.eventLoopData.wakeupFds, sizeof(_glfw.wl.eventLoopData.wakeupFds)/sizeof(_glfw.wl.eventLoopData.wakeupFds[0]));
+    free(_glfw.wl.clipboardString); _glfw.wl.clipboardString = NULL;
 }
 
 const char* _glfwPlatformGetVersionString(void)

glfw/wl_platform.h

@@ -193,6 +193,9 @@ typedef struct _GLFWlibraryWayland
     struct zwp_relative_pointer_manager_v1* relativePointerManager;
     struct zwp_pointer_constraints_v1*      pointerConstraints;
     struct zwp_idle_inhibit_manager_v1*     idleInhibitManager;
+    struct wl_data_device_manager*          dataDeviceManager;
+    struct wl_data_device*                  dataDevice;
+    struct wl_data_source*                  dataSourceForClipboard;
 
     int                         compositorVersion;
     int                         seatVersion;
@@ -232,7 +235,7 @@ typedef struct _GLFWlibraryWayland
     } egl;
 
     EventLoopData eventLoopData;
-
+    char *clipboardString;
 } _GLFWlibraryWayland;
 
 // Wayland-specific per-monitor data

glfw/wl_window.c

@@ -1435,11 +1435,95 @@ void _glfwPlatformSetCursor(_GLFWwindow* window, _GLFWcursor* cursor)
     }
 }
 
+static void _glfwSendClipboardText(void *data, struct wl_data_source *data_source, const char *mime_type, int fd)
+{
+    if (_glfw.wl.clipboardString) {
+        size_t len = strlen(_glfw.wl.clipboardString), pos = 0;
+        double start = glfwGetTime();
+        while (pos < len && glfwGetTime() - start < 2.0) {
+            ssize_t ret = write(fd, _glfw.wl.clipboardString + pos, len - pos);
+            if (ret < 0) {
+                if (errno == EAGAIN || errno == EINTR) continue;
+                _glfwInputError(GLFW_PLATFORM_ERROR,
+                    "Wayland: Could not copy writing to destination fd failed with error: %s", strerror(errno));
+                break;
+            }
+            if (ret > 0) {
+                start = glfwGetTime();
+                pos += ret;
+            }
+        }
+    }
+    close(fd);
+}
+
+static void _glfwDataSourceTargetHandler(void *data, struct wl_data_source *data_source, const char *mime_type) {}
+static void _glfwDataSourceCanceledHandler(void *data, struct wl_data_source *data_source) {}
+
+
+const struct wl_data_source_listener data_source_listener = {
+    .send = _glfwSendClipboardText,
+    .target = _glfwDataSourceTargetHandler,
+    .cancelled = _glfwDataSourceCanceledHandler
+};
+
+static void
+copy_callback_done(void *data, struct wl_callback *callback, uint32_t serial) {
+    if (!_glfw.wl.dataDevice) return;
+    if (data == (void*)_glfw.wl.dataSourceForClipboard) {
+        wl_data_device_set_selection(_glfw.wl.dataDevice, data, serial);
+    }
+}
+
+const struct wl_callback_listener copy_callback_listener = {
+    .done = copy_callback_done
+};
+
+
 void _glfwPlatformSetClipboardString(const char* string)
 {
-    // TODO
+    if (!_glfw.wl.dataDeviceManager)
+    {
         _glfwInputError(GLFW_PLATFORM_ERROR,
-                    "Wayland: Clipboard setting not implemented yet");
+                        "Wayland: Cannot copy to clipboard data device manager is not ready");
+        return;
+    }
+    if (!_glfw.wl.dataDevice)
+    {
+        if (!_glfw.wl.seat)
+        {
+            _glfwInputError(GLFW_PLATFORM_ERROR,
+                            "Wayland: Cannot copy to clipboard seat is not ready");
+            return;
+        }
+        _glfw.wl.dataDevice = wl_data_device_manager_get_data_device(_glfw.wl.dataDeviceManager, _glfw.wl.seat);
+        if (!_glfw.wl.dataDevice)
+        {
+            _glfwInputError(GLFW_PLATFORM_ERROR,
+                    "Wayland: Clipboard copy not enabled, failed to create data device");
+            return;
+        }
+    }
+
+    free(_glfw.wl.clipboardString);
+    _glfw.wl.clipboardString = _glfw_strdup(string);
+    if (_glfw.wl.dataSourceForClipboard)
+        wl_data_source_destroy(_glfw.wl.dataSourceForClipboard);
+    _glfw.wl.dataSourceForClipboard = wl_data_device_manager_create_data_source(_glfw.wl.dataDeviceManager);
+    if (!_glfw.wl.dataSourceForClipboard)
+    {
+        _glfwInputError(GLFW_PLATFORM_ERROR,
+                        "Wayland: Cannot copy failed to create data source");
+        return;
+    }
+    wl_data_source_add_listener(_glfw.wl.dataSourceForClipboard, &data_source_listener, NULL);
+    wl_data_source_offer(_glfw.wl.dataSourceForClipboard, "text/plain");
+    wl_data_source_offer(_glfw.wl.dataSourceForClipboard, "text/plain;charset=utf-8");
+    wl_data_source_offer(_glfw.wl.dataSourceForClipboard, "TEXT");
+    wl_data_source_offer(_glfw.wl.dataSourceForClipboard, "STRING");
+    wl_data_source_offer(_glfw.wl.dataSourceForClipboard, "UTF8_STRING");
+    struct wl_callback *callback = wl_display_sync(_glfw.wl.display);
+    wl_callback_add_listener(callback, &copy_callback_listener, _glfw.wl.dataSourceForClipboard);
 }
 
 const char* _glfwPlatformGetClipboardString(void)