391 lines
14 KiB
C
391 lines
14 KiB
C
/*
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* vim:ts=4:sw=4:expandtab
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*
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* i3 - an improved dynamic tiling window manager
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* © 2009 Michael Stapelberg and contributors (see also: LICENSE)
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*
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* move.c: Moving containers into some direction.
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*
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*/
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#include "all.h"
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/*
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* Returns the lowest container in the tree that has both a and b as descendants.
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*
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*/
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static Con *lowest_common_ancestor(Con *a, Con *b) {
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Con *parent_a = a;
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while (parent_a) {
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Con *parent_b = b;
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while (parent_b) {
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if (parent_a == parent_b) {
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return parent_a;
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}
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parent_b = parent_b->parent;
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}
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parent_a = parent_a->parent;
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}
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assert(false);
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}
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/*
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* Returns the direct child of ancestor that contains con.
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*
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*/
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static Con *child_containing_con_recursively(Con *ancestor, Con *con) {
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Con *child = con;
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while (child && child->parent != ancestor) {
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child = child->parent;
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assert(child->parent);
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}
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return child;
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}
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/*
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* Returns true if the given container is the focused descendant of ancestor, recursively.
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*
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*/
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static bool is_focused_descendant(Con *con, Con *ancestor) {
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Con *current = con;
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while (current != ancestor) {
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if (TAILQ_FIRST(&(current->parent->focus_head)) != current) {
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return false;
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}
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current = current->parent;
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assert(current->parent);
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}
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return true;
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}
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/*
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* This function detaches 'con' from its parent and inserts it either before or
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* after 'target'.
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*
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*/
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void insert_con_into(Con *con, Con *target, position_t position) {
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Con *parent = target->parent;
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/* We need to preserve the old con->parent. While it might still be used to
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* insert the entry before/after it, we call the on_remove_child callback
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* afterwards which might then close the con if it is empty. */
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Con *old_parent = con->parent;
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/* We compare the focus order of the children of the lowest common ancestor. If con or
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* its ancestor is before target's ancestor then con should be placed before the target
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* in the focus stack. */
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Con *lca = lowest_common_ancestor(con, parent);
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if (lca == con) {
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ELOG("Container is being inserted into one of its descendants.\n");
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return;
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}
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Con *con_ancestor = child_containing_con_recursively(lca, con);
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Con *target_ancestor = child_containing_con_recursively(lca, target);
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bool moves_focus_from_ancestor = is_focused_descendant(con, con_ancestor);
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bool focus_before;
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/* Determine if con is going to be placed before or after target in the parent's focus stack. */
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if (con_ancestor == target_ancestor) {
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/* Happens when the target is con's old parent. Eg with layout V [ A H [ B C ] ],
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* if we move C up. Target will be H. */
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focus_before = moves_focus_from_ancestor;
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} else {
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/* Look at the focus stack order of the children of the lowest common ancestor. */
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Con *current;
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TAILQ_FOREACH (current, &(lca->focus_head), focused) {
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if (current == con_ancestor || current == target_ancestor) {
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break;
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}
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}
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focus_before = (current == con_ancestor);
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}
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/* If con is the focused container in our old ancestor we place the new ancestor
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* before the old ancestor in the focus stack. Example:
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* Consider the layout [ H [ V1 [ A* B ] V2 [ C ] ] ] where A is focused. We move to
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* a second workspace and from there we move A to the right and switch back to the
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* original workspace. Without the change focus would move to B instead of staying
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* with A. */
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if (moves_focus_from_ancestor && focus_before) {
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Con *place = TAILQ_PREV(con_ancestor, focus_head, focused);
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TAILQ_REMOVE(&(lca->focus_head), target_ancestor, focused);
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if (place) {
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TAILQ_INSERT_AFTER(&(lca->focus_head), place, target_ancestor, focused);
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} else {
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TAILQ_INSERT_HEAD(&(lca->focus_head), target_ancestor, focused);
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}
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}
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con_detach(con);
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con_fix_percent(con->parent);
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/* When moving to a workspace, we respect the user’s configured
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* workspace_layout */
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if (parent->type == CT_WORKSPACE) {
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Con *split = workspace_attach_to(parent);
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if (split != parent) {
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DLOG("Got a new split con, using that one instead\n");
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con->parent = split;
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con_attach(con, split, false);
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DLOG("attached\n");
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con->percent = 0.0;
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con_fix_percent(split);
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con = split;
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DLOG("ok, continuing with con %p instead\n", con);
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con_detach(con);
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}
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}
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con->parent = parent;
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if (parent == lca) {
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if (focus_before) {
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/* Example layout: H [ A B* ], we move A up/down. 'target' will be H. */
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TAILQ_INSERT_BEFORE(target, con, focused);
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} else {
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/* Example layout: H [ A B* ], we move A up/down. 'target' will be H. */
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TAILQ_INSERT_AFTER(&(parent->focus_head), target, con, focused);
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}
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} else {
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if (focus_before) {
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/* Example layout: V [ H [ A B ] C* ], we move C up. 'target' will be A. */
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TAILQ_INSERT_HEAD(&(parent->focus_head), con, focused);
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} else {
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/* Example layout: V [ H [ A* B ] C ], we move C up. 'target' will be A. */
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TAILQ_INSERT_TAIL(&(parent->focus_head), con, focused);
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}
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}
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if (position == BEFORE) {
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TAILQ_INSERT_BEFORE(target, con, nodes);
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} else if (position == AFTER) {
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TAILQ_INSERT_AFTER(&(parent->nodes_head), target, con, nodes);
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}
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/* Pretend the con was just opened with regards to size percent values.
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* Since the con is moved to a completely different con, the old value
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* does not make sense anyways. */
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con->percent = 0.0;
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con_fix_percent(parent);
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CALL(old_parent, on_remove_child);
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}
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/*
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* This function detaches 'con' from its parent and puts it in the given
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* workspace. Position is determined by the direction of movement into the
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* workspace container.
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*
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*/
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static void attach_to_workspace(Con *con, Con *ws, direction_t direction) {
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con_detach(con);
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Con *old_parent = con->parent;
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con->parent = ws;
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if (direction == D_RIGHT || direction == D_DOWN) {
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TAILQ_INSERT_HEAD(&(ws->nodes_head), con, nodes);
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} else {
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TAILQ_INSERT_TAIL(&(ws->nodes_head), con, nodes);
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}
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TAILQ_INSERT_TAIL(&(ws->focus_head), con, focused);
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/* Pretend the con was just opened with regards to size percent values.
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* Since the con is moved to a completely different con, the old value
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* does not make sense anyways. */
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con->percent = 0.0;
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con_fix_percent(ws);
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con_fix_percent(old_parent);
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CALL(old_parent, on_remove_child);
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}
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/*
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* Moves the given container to the closest output in the given direction if
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* such an output exists.
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*
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*/
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static void move_to_output_directed(Con *con, direction_t direction) {
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Output *current_output = get_output_for_con(con);
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Output *output = get_output_next(direction, current_output, CLOSEST_OUTPUT);
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if (!output) {
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DLOG("No output in this direction found. Not moving.\n");
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return;
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}
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Con *ws = NULL;
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GREP_FIRST(ws, output_get_content(output->con), workspace_is_visible(child));
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if (!ws) {
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DLOG("No workspace on output in this direction found. Not moving.\n");
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return;
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}
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Con *old_ws = con_get_workspace(con);
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const bool moves_focus = (focused == con);
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attach_to_workspace(con, ws, direction);
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if (moves_focus) {
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/* workspace_show will not correctly update the active workspace because
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* the focused container, con, is now a child of ws. To work around this
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* and still produce the correct workspace focus events (see
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* 517-regress-move-direction-ipc.t) we need to temporarily set focused
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* to the old workspace. */
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focused = old_ws;
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workspace_show(ws);
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con_focus(con);
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}
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/* force re-painting the indicators */
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FREE(con->deco_render_params);
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ipc_send_window_event("move", con);
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tree_flatten(croot);
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ewmh_update_wm_desktop();
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}
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/*
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* Moves the given container in the given direction
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*
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*/
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void tree_move(Con *con, direction_t direction) {
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position_t position;
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Con *target;
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DLOG("Moving in direction %d\n", direction);
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/* 1: get the first parent with the same orientation */
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if (con->type == CT_WORKSPACE) {
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DLOG("Not moving workspace\n");
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return;
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}
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if (con->fullscreen_mode == CF_GLOBAL) {
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DLOG("Not moving fullscreen global container\n");
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return;
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}
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if ((con->fullscreen_mode == CF_OUTPUT) ||
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(con->parent->type == CT_WORKSPACE && con_num_children(con->parent) == 1)) {
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/* This is the only con on this workspace */
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move_to_output_directed(con, direction);
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return;
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}
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orientation_t o = orientation_from_direction(direction);
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Con *same_orientation = con_parent_with_orientation(con, o);
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/* The do {} while is used to 'restart' at this point with a different
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* same_orientation, see the very last lines before the end of this block
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* */
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do {
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/* There is no parent container with the same orientation */
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if (!same_orientation) {
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if (con_is_floating(con)) {
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/* this is a floating con, we just disable floating */
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floating_disable(con);
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return;
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}
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if (con_inside_floating(con)) {
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/* 'con' should be moved out of a floating container */
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DLOG("Inside floating, moving to workspace\n");
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attach_to_workspace(con, con_get_workspace(con), direction);
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goto end;
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}
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DLOG("Force-changing orientation\n");
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ws_force_orientation(con_get_workspace(con), o);
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same_orientation = con_parent_with_orientation(con, o);
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}
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/* easy case: the move is within this container */
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if (same_orientation == con->parent) {
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Con *swap = (direction == D_LEFT || direction == D_UP)
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? TAILQ_PREV(con, nodes_head, nodes)
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: TAILQ_NEXT(con, nodes);
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if (swap) {
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if (!con_is_leaf(swap)) {
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DLOG("Moving into our bordering branch\n");
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target = con_descend_direction(swap, direction);
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position = (con_orientation(target->parent) != o ||
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direction == D_UP ||
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direction == D_LEFT
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? AFTER
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: BEFORE);
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insert_con_into(con, target, position);
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goto end;
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}
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DLOG("Swapping with sibling.\n");
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if (direction == D_LEFT || direction == D_UP) {
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TAILQ_SWAP(swap, con, &(swap->parent->nodes_head), nodes);
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} else {
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TAILQ_SWAP(con, swap, &(swap->parent->nodes_head), nodes);
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}
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ipc_send_window_event("move", con);
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return;
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}
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if (con->parent == con_get_workspace(con)) {
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/* If we couldn't find a place to move it on this workspace, try
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* to move it to a workspace on a different output */
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move_to_output_directed(con, direction);
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return;
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}
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/* If there was no con with which we could swap the current one,
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* search again, but starting one level higher. */
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same_orientation = con_parent_with_orientation(con->parent, o);
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}
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} while (same_orientation == NULL);
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/* this time, we have to move to another container */
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/* This is the container *above* 'con' (an ancestor of con) which is inside
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* 'same_orientation' */
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Con *above = con;
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while (above->parent != same_orientation)
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above = above->parent;
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/* Enforce the fullscreen focus restrictions. */
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if (!con_fullscreen_permits_focusing(above->parent)) {
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LOG("Cannot move out of fullscreen container\n");
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return;
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}
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DLOG("above = %p\n", above);
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Con *next = (direction == D_UP || direction == D_LEFT ? TAILQ_PREV(above, nodes_head, nodes) : TAILQ_NEXT(above, nodes));
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if (next && !con_is_leaf(next)) {
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DLOG("Moving into the bordering branch of our adjacent container\n");
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target = con_descend_direction(next, direction);
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position = (con_orientation(target->parent) != o ||
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direction == D_UP ||
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direction == D_LEFT
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? AFTER
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: BEFORE);
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insert_con_into(con, target, position);
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} else if (!next &&
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con->parent->parent->type == CT_WORKSPACE &&
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con->parent->layout != L_DEFAULT &&
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con_num_children(con->parent) == 1) {
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/* Con is the lone child of a non-default layout container at the edge
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* of the workspace. Treat it as though the workspace is its parent
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* and move it to the next output. */
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DLOG("Grandparent is workspace\n");
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move_to_output_directed(con, direction);
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return;
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} else {
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DLOG("Moving into container above\n");
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position = (direction == D_UP || direction == D_LEFT ? BEFORE : AFTER);
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insert_con_into(con, above, position);
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}
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end:
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/* force re-painting the indicators */
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FREE(con->deco_render_params);
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ipc_send_window_event("move", con);
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tree_flatten(croot);
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ewmh_update_wm_desktop();
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}
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