+
+ // if there were children without a percentage set, set to a value that
+ // will make those children proportional to all others
+ if (children_with_percent != children) {
+ TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
+ if (child->percent <= 0.0) {
+ if (children_with_percent == 0)
+ total += (child->percent = 1.0);
+ else total += (child->percent = total / children_with_percent);
+ }
+ }
+ }
+
+ // if we got a zero, just distribute the space equally, otherwise
+ // distribute according to the proportions we got
+ if (total == 0.0) {
+ TAILQ_FOREACH(child, &(con->nodes_head), nodes)
+ child->percent = 1.0 / children;
+ } else if (total != 1.0) {
+ TAILQ_FOREACH(child, &(con->nodes_head), nodes)
+ child->percent /= total;
+ }
+}
+
+/*
+ * Toggles fullscreen mode for the given container. Fullscreen mode will not be
+ * entered when there already is a fullscreen container on this workspace.
+ *
+ */
+void con_toggle_fullscreen(Con *con) {
+ Con *workspace, *fullscreen;
+
+ if (con->type == CT_WORKSPACE) {
+ DLOG("You cannot make a workspace fullscreen.\n");
+ return;
+ }
+
+ DLOG("toggling fullscreen for %p / %s\n", con, con->name);
+ if (con->fullscreen_mode == CF_NONE) {
+ /* 1: check if there already is a fullscreen con */
+ workspace = con_get_workspace(con);
+ if ((fullscreen = con_get_fullscreen_con(workspace)) != NULL) {
+ LOG("Not entering fullscreen mode, container (%p/%s) "
+ "already is in fullscreen mode\n",
+ fullscreen, fullscreen->name);
+ } else {
+ /* 2: enable fullscreen */
+ con->fullscreen_mode = CF_OUTPUT;
+ }
+ } else {
+ /* 1: disable fullscreen */
+ con->fullscreen_mode = CF_NONE;
+ }
+ DLOG("mode now: %d\n", con->fullscreen_mode);
+
+ /* update _NET_WM_STATE if this container has a window */
+ /* TODO: when a window is assigned to a container which is already
+ * fullscreened, this state needs to be pushed to the client, too */
+ if (con->window == NULL)
+ return;
+
+ uint32_t values[1];
+ unsigned int num = 0;
+
+ if (con->fullscreen_mode != CF_NONE)
+ values[num++] = A__NET_WM_STATE_FULLSCREEN;
+
+ xcb_change_property(conn, XCB_PROP_MODE_REPLACE, con->window->id,
+ A__NET_WM_STATE, A_ATOM, 32, num, values);
+}
+
+/*
+ * Moves the given container to the currently focused container on the given
+ * workspace.
+ * TODO: is there a better place for this function?
+ *
+ */
+void con_move_to_workspace(Con *con, Con *workspace) {
+ if (con->type == CT_WORKSPACE) {
+ DLOG("Moving workspaces is not yet implemented.\n");
+ return;
+ }
+
+ if (con_is_floating(con)) {
+ DLOG("Using FLOATINGCON instead\n");
+ con = con->parent;
+ }
+
+ Con *source_output = con_get_output(con),
+ *dest_output = con_get_output(workspace);
+
+ /* 1: save the container which is going to be focused after the current
+ * container is moved away */
+ Con *focus_next = con_next_focused(con);
+
+ /* 2: get the focused container of this workspace */
+ Con *next = con_descend_focused(workspace);
+
+ /* 3: we go up one level, but only when next is a normal container */
+ if (next->type != CT_WORKSPACE) {
+ DLOG("next originally = %p / %s / type %d\n", next, next->name, next->type);
+ next = next->parent;
+ }
+
+ /* 4: if the target container is floating, we get the workspace instead.
+ * Only tiling windows need to get inserted next to the current container.
+ * */
+ Con *floatingcon = con_inside_floating(next);
+ if (floatingcon != NULL) {
+ DLOG("floatingcon, going up even further\n");
+ next = floatingcon->parent;
+ }
+
+ if (con->type == CT_FLOATING_CON) {
+ Con *ws = con_get_workspace(next);
+ DLOG("This is a floating window, using workspace %p / %s\n", ws, ws->name);
+ next = ws;
+ }
+
+ DLOG("Re-attaching container to %p / %s\n", next, next->name);
+ /* 5: re-attach the con to the parent of this focused container */
+ Con *parent = con->parent;
+ con_detach(con);
+ con_attach(con, next, false);
+
+ /* 6: fix the percentages */
+ con_fix_percent(parent);
+ con->percent = 0.0;
+ con_fix_percent(next);
+
+ /* 7: focus the con on the target workspace (the X focus is only updated by
+ * calling tree_render(), so for the "real" focus this is a no-op) */
+ con_focus(con);
+
+ /* 8: when moving to a visible workspace on a different output, we keep the
+ * con focused. Otherwise, we leave the focus on the current workspace as we
+ * don’t want to focus invisible workspaces */
+ if (source_output != dest_output &&
+ workspace_is_visible(workspace)) {
+ DLOG("Moved to a different output, focusing target\n");
+ } else {
+ con_focus(focus_next);
+ }
+
+ CALL(parent, on_remove_child);
+}
+
+/*
+ * Returns the orientation of the given container (for stacked containers,
+ * vertical orientation is used regardless of the actual orientation of the
+ * container).
+ *
+ */
+int con_orientation(Con *con) {
+ /* stacking containers behave like they are in vertical orientation */
+ if (con->layout == L_STACKED)
+ return VERT;
+
+ if (con->layout == L_TABBED)
+ return HORIZ;
+
+ return con->orientation;
+}
+
+/*
+ * Returns the container which will be focused next when the given container
+ * is not available anymore. Called in tree_close and con_move_to_workspace
+ * to properly restore focus.
+ *
+ */
+Con *con_next_focused(Con *con) {
+ Con *next;
+ /* floating containers are attached to a workspace, so we focus either the
+ * next floating container (if any) or the workspace itself. */
+ if (con->type == CT_FLOATING_CON) {
+ DLOG("selecting next for CT_FLOATING_CON\n");
+ next = TAILQ_NEXT(con, floating_windows);
+ if (next == TAILQ_END(&(parent->floating_head))) {
+ Con *ws = con_get_workspace(con);
+ next = ws;
+ DLOG("no more floating containers for next = %p, restoring workspace focus\n", next);
+ while (next != TAILQ_END(&(ws->focus_head)) && !TAILQ_EMPTY(&(next->focus_head))) {
+ next = TAILQ_FIRST(&(next->focus_head));
+ if (next == con) {
+ DLOG("skipping container itself, we want the next client\n");
+ next = TAILQ_NEXT(next, focused);
+ }
+ }
+ if (next == TAILQ_END(&(ws->focus_head))) {
+ DLOG("Focus list empty, returning ws\n");
+ next = ws;
+ }
+ } else {
+ /* Instead of returning the next CT_FLOATING_CON, we descend it to
+ * get an actual window to focus. */
+ next = con_descend_focused(next);
+ }
+ return next;
+ }
+
+ /* dock clients cannot be focused, so we focus the workspace instead */
+ if (con->parent->type == CT_DOCKAREA) {
+ DLOG("selecting workspace for dock client\n");
+ return con_descend_focused(output_get_content(con->parent->parent));
+ }
+
+ /* if 'con' is not the first entry in the focus stack, use the first one as
+ * it’s currently focused already */
+ Con *first = TAILQ_FIRST(&(con->parent->focus_head));
+ if (first != con) {
+ DLOG("Using first entry %p\n", first);
+ next = first;
+ } else {
+ /* try to focus the next container on the same level as this one or fall
+ * back to its parent */
+ if (!(next = TAILQ_NEXT(con, focused)))
+ next = con->parent;
+ }
+
+ /* now go down the focus stack as far as
+ * possible, excluding the current container */
+ while (!TAILQ_EMPTY(&(next->focus_head)) &&
+ TAILQ_FIRST(&(next->focus_head)) != con)
+ next = TAILQ_FIRST(&(next->focus_head));
+
+ return next;
+}
+
+/*
+ * Get the next/previous container in the specified orientation. This may
+ * travel up until it finds a container with suitable orientation.
+ *
+ */
+Con *con_get_next(Con *con, char way, orientation_t orientation) {
+ DLOG("con_get_next(way=%c, orientation=%d)\n", way, orientation);
+ /* 1: get the first parent with the same orientation */
+ Con *cur = con;
+ while (con_orientation(cur->parent) != orientation) {
+ DLOG("need to go one level further up\n");
+ if (cur->parent->type == CT_WORKSPACE) {
+ LOG("that's a workspace, we can't go further up\n");
+ return NULL;
+ }
+ cur = cur->parent;
+ }
+
+ /* 2: chose next (or previous) */
+ Con *next;
+ if (way == 'n') {
+ next = TAILQ_NEXT(cur, nodes);
+ /* if we are at the end of the list, we need to wrap */
+ if (next == TAILQ_END(&(parent->nodes_head)))
+ return NULL;
+ } else {
+ next = TAILQ_PREV(cur, nodes_head, nodes);
+ /* if we are at the end of the list, we need to wrap */
+ if (next == TAILQ_END(&(cur->nodes_head)))
+ return NULL;
+ }
+ DLOG("next = %p\n", next);
+
+ return next;
+}
+
+/*
+ * Returns the focused con inside this client, descending the tree as far as
+ * possible. This comes in handy when attaching a con to a workspace at the
+ * currently focused position, for example.
+ *
+ */
+Con *con_descend_focused(Con *con) {
+ Con *next = con;
+ while (!TAILQ_EMPTY(&(next->focus_head)))
+ next = TAILQ_FIRST(&(next->focus_head));
+ return next;
+}
+
+/*
+ * Returns the focused con inside this client, descending the tree as far as
+ * possible. This comes in handy when attaching a con to a workspace at the
+ * currently focused position, for example.
+ *
+ * Works like con_descend_focused but considers only tiling cons.
+ *
+ */
+Con *con_descend_tiling_focused(Con *con) {
+ Con *next = con;
+ Con *before;
+ Con *child;
+ do {
+ before = next;
+ TAILQ_FOREACH(child, &(next->focus_head), focused) {
+ if (child->type == CT_FLOATING_CON)
+ continue;
+
+ next = child;
+ break;
+ }
+ } while (before != next);
+ return next;
+}
+
+
+/*
+ * Returns a "relative" Rect which contains the amount of pixels that need to
+ * be added to the original Rect to get the final position (obviously the
+ * amount of pixels for normal, 1pixel and borderless are different).
+ *
+ */
+Rect con_border_style_rect(Con *con) {
+ switch (con_border_style(con)) {
+ case BS_NORMAL:
+ return (Rect){2, 0, -(2 * 2), -2};
+
+ case BS_1PIXEL:
+ return (Rect){1, 1, -2, -2};
+
+ case BS_NONE:
+ return (Rect){0, 0, 0, 0};
+
+ default:
+ assert(false);
+ }
+}
+
+/*
+ * Use this function to get a container’s border style. This is important
+ * because when inside a stack, the border style is always BS_NORMAL.
+ * For tabbed mode, the same applies, with one exception: when the container is
+ * borderless and the only element in the tabbed container, the border is not
+ * rendered.
+ *
+ * For children of a CT_DOCKAREA, the border style is always none.
+ *
+ */
+int con_border_style(Con *con) {
+ Con *fs = con_get_fullscreen_con(con->parent);
+ if (fs == con) {
+ DLOG("this one is fullscreen! overriding BS_NONE\n");
+ return BS_NONE;
+ }
+
+ if (con->parent->layout == L_STACKED)
+ return (con_num_children(con->parent) == 1 ? con->border_style : BS_NORMAL);
+
+ if (con->parent->layout == L_TABBED && con->border_style != BS_NORMAL)
+ return (con_num_children(con->parent) == 1 ? con->border_style : BS_NORMAL);
+
+ if (con->parent->type == CT_DOCKAREA)
+ return BS_NONE;
+
+ return con->border_style;
+}
+
+/*
+ * This function changes the layout of a given container. Use it to handle
+ * special cases like changing a whole workspace to stacked/tabbed (creates a
+ * new split container before).
+ *
+ */
+void con_set_layout(Con *con, int layout) {
+ /* When the container type is CT_WORKSPACE, the user wants to change the
+ * whole workspace into stacked/tabbed mode. To do this and still allow
+ * intuitive operations (like level-up and then opening a new window), we
+ * need to create a new split container. */
+ if (con->type == CT_WORKSPACE) {
+ DLOG("Creating new split container\n");
+ /* 1: create a new split container */
+ Con *new = con_new(NULL);
+ new->parent = con;
+
+ /* 2: set the requested layout on the split con */
+ new->layout = layout;
+
+ /* 3: While the layout is irrelevant in stacked/tabbed mode, it needs
+ * to be set. Otherwise, this con will not be interpreted as a split
+ * container. */
+ if (config.default_orientation == NO_ORIENTATION) {
+ new->orientation = (con->rect.height > con->rect.width) ? VERT : HORIZ;
+ } else {
+ new->orientation = config.default_orientation;
+ }
+
+ Con *old_focused = TAILQ_FIRST(&(con->focus_head));
+ if (old_focused == TAILQ_END(&(con->focus_head)))
+ old_focused = NULL;
+
+ /* 4: move the existing cons of this workspace below the new con */
+ DLOG("Moving cons\n");
+ Con *child;
+ while (!TAILQ_EMPTY(&(con->nodes_head))) {
+ child = TAILQ_FIRST(&(con->nodes_head));
+ con_detach(child);
+ con_attach(child, new, true);
+ }
+
+ /* 4: attach the new split container to the workspace */
+ DLOG("Attaching new split to ws\n");
+ con_attach(new, con, false);
+
+ if (old_focused)
+ con_focus(old_focused);
+
+ tree_flatten(croot);
+
+ return;
+ }
+
+ con->layout = layout;
+}
+
+/*
+ * Callback which will be called when removing a child from the given con.
+ * Kills the container if it is empty and replaces it with the child if there
+ * is exactly one child.
+ *
+ */
+static void con_on_remove_child(Con *con) {
+ DLOG("on_remove_child\n");
+
+ /* Every container 'above' (in the hierarchy) the workspace content should
+ * not be closed when the last child was removed */
+ if (con->type == CT_WORKSPACE ||
+ con->type == CT_OUTPUT ||
+ con->type == CT_ROOT ||
+ con->type == CT_DOCKAREA) {
+ DLOG("not handling, type = %d\n", con->type);
+ return;
+ }
+
+ /* TODO: check if this container would swallow any other client and
+ * don’t close it automatically. */
+ int children = con_num_children(con);
+ if (children == 0) {
+ DLOG("Container empty, closing\n");
+ tree_close(con, DONT_KILL_WINDOW, false);
+ return;
+ }
+}
+
+/*
+ * Determines the minimum size of the given con by looking at its children (for
+ * split/stacked/tabbed cons). Will be called when resizing floating cons
+ *
+ */
+Rect con_minimum_size(Con *con) {
+ DLOG("Determining minimum size for con %p\n", con);
+
+ if (con_is_leaf(con)) {
+ DLOG("leaf node, returning 75x50\n");
+ return (Rect){ 0, 0, 75, 50 };
+ }
+
+ if (con->type == CT_FLOATING_CON) {
+ DLOG("floating con\n");
+ Con *child = TAILQ_FIRST(&(con->nodes_head));
+ return con_minimum_size(child);
+ }
+
+ if (con->layout == L_STACKED || con->layout == L_TABBED) {
+ uint32_t max_width = 0, max_height = 0, deco_height = 0;
+ Con *child;
+ TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
+ Rect min = con_minimum_size(child);
+ deco_height += child->deco_rect.height;
+ max_width = max(max_width, min.width);
+ max_height = max(max_height, min.height);
+ }
+ DLOG("stacked/tabbed now, returning %d x %d + deco_rect = %d\n",
+ max_width, max_height, deco_height);
+ return (Rect){ 0, 0, max_width, max_height + deco_height };
+ }
+
+ /* For horizontal/vertical split containers we sum up the width (h-split)
+ * or height (v-split) and use the maximum of the height (h-split) or width
+ * (v-split) as minimum size. */
+ if (con->orientation == HORIZ || con->orientation == VERT) {
+ uint32_t width = 0, height = 0;
+ Con *child;
+ TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
+ Rect min = con_minimum_size(child);
+ if (con->orientation == HORIZ) {
+ width += min.width;
+ height = max(height, min.height);
+ } else {
+ height += min.height;
+ width = max(width, min.width);
+ }
+ }
+ DLOG("split container, returning width = %d x height = %d\n", width, height);
+ return (Rect){ 0, 0, width, height };
+ }
+
+ ELOG("Unhandled case, type = %d, layout = %d, orientation = %d\n",
+ con->type, con->layout, con->orientation);
+ assert(false);