i3
move.c
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1 /*
2  * vim:ts=4:sw=4:expandtab
3  *
4  * i3 - an improved dynamic tiling window manager
5  * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
6  *
7  * move.c: Moving containers into some direction.
8  *
9  */
10 #include "all.h"
11 
12 typedef enum { BEFORE, AFTER } position_t;
13 
14 /*
15  * This function detaches 'con' from its parent and inserts it either before or
16  * after 'target'.
17  *
18  */
19 static void insert_con_into(Con *con, Con *target, position_t position) {
20  Con *parent = target->parent;
21  /* We need to preserve the old con->parent. While it might still be used to
22  * insert the entry before/after it, we call the on_remove_child callback
23  * afterwards which might then close the con if it is empty. */
24  Con *old_parent = con->parent;
25 
26  con_detach(con);
27  con_fix_percent(con->parent);
28 
29  /* When moving to a workspace, we respect the user’s configured
30  * workspace_layout */
31  if (parent->type == CT_WORKSPACE) {
32  Con *split = workspace_attach_to(parent);
33  if (split != parent) {
34  DLOG("Got a new split con, using that one instead\n");
35  con->parent = split;
36  con_attach(con, split, false);
37  DLOG("attached\n");
38  con->percent = 0.0;
39  con_fix_percent(split);
40  con = split;
41  DLOG("ok, continuing with con %p instead\n", con);
42  con_detach(con);
43  }
44  }
45 
46  con->parent = parent;
47 
48  if (position == BEFORE) {
49  TAILQ_INSERT_BEFORE(target, con, nodes);
50  TAILQ_INSERT_HEAD(&(parent->focus_head), con, focused);
51  } else if (position == AFTER) {
52  TAILQ_INSERT_AFTER(&(parent->nodes_head), target, con, nodes);
53  TAILQ_INSERT_HEAD(&(parent->focus_head), con, focused);
54  }
55 
56  /* Pretend the con was just opened with regards to size percent values.
57  * Since the con is moved to a completely different con, the old value
58  * does not make sense anyways. */
59  con->percent = 0.0;
60  con_fix_percent(parent);
61 
62  CALL(old_parent, on_remove_child);
63 }
64 
65 /*
66  * This function detaches 'con' from its parent and inserts it at the given
67  * workspace.
68  *
69  */
70 static void attach_to_workspace(Con *con, Con *ws) {
71  con_detach(con);
72  con_fix_percent(con->parent);
73 
74  CALL(con->parent, on_remove_child);
75 
76  con->parent = ws;
77 
78  TAILQ_INSERT_TAIL(&(ws->nodes_head), con, nodes);
79  TAILQ_INSERT_TAIL(&(ws->focus_head), con, focused);
80 
81  /* Pretend the con was just opened with regards to size percent values.
82  * Since the con is moved to a completely different con, the old value
83  * does not make sense anyways. */
84  con->percent = 0.0;
85  con_fix_percent(ws);
86 }
87 
88 /*
89  * Moves the current container in the given direction (D_LEFT, D_RIGHT,
90  * D_UP, D_DOWN).
91  *
92  */
93 void tree_move(int direction) {
94  DLOG("Moving in direction %d\n", direction);
95  /* 1: get the first parent with the same orientation */
96  Con *con = focused;
97 
98  if (con->type == CT_WORKSPACE) {
99  DLOG("Not moving workspace\n");
100  return;
101  }
102 
103  if (con->parent->type == CT_WORKSPACE && con_num_children(con->parent) == 1) {
104  DLOG("This is the only con on this workspace, not doing anything\n");
105  return;
106  }
107 
108  orientation_t o = (direction == D_LEFT || direction == D_RIGHT ? HORIZ : VERT);
109 
110  Con *same_orientation = con_parent_with_orientation(con, o);
111  /* The do {} while is used to 'restart' at this point with a different
112  * same_orientation, see the very last lines before the end of this block
113  * */
114  do {
115  /* There is no parent container with the same orientation */
116  if (!same_orientation) {
117  if (con_is_floating(con)) {
118  /* this is a floating con, we just disable floating */
119  floating_disable(con, true);
120  return;
121  }
122  if (con_inside_floating(con)) {
123  /* 'con' should be moved out of a floating container */
124  DLOG("Inside floating, moving to workspace\n");
126  goto end;
127  }
128  DLOG("Force-changing orientation\n");
130  same_orientation = con_parent_with_orientation(con, o);
131  }
132 
133  /* easy case: the move is within this container */
134  if (same_orientation == con->parent) {
135  DLOG("We are in the same container\n");
136  Con *swap;
137  if ((swap = (direction == D_LEFT || direction == D_UP ?
138  TAILQ_PREV(con, nodes_head, nodes) :
139  TAILQ_NEXT(con, nodes)))) {
140  if (!con_is_leaf(swap)) {
142  goto end;
143  }
144  if (direction == D_LEFT || direction == D_UP)
145  TAILQ_SWAP(swap, con, &(swap->parent->nodes_head), nodes);
146  else TAILQ_SWAP(con, swap, &(swap->parent->nodes_head), nodes);
147 
148  TAILQ_REMOVE(&(con->parent->focus_head), con, focused);
149  TAILQ_INSERT_HEAD(&(swap->parent->focus_head), con, focused);
150 
151  DLOG("Swapped.\n");
152  return;
153  }
154 
155  /* If there was no con with which we could swap the current one, search
156  * again, but starting one level higher. If we are on the workspace
157  * level, don’t do that. The result would be a force change of
158  * workspace orientation, which is not necessary. */
159  if (con->parent == con_get_workspace(con))
160  return;
161  same_orientation = con_parent_with_orientation(con->parent, o);
162  }
163  } while (same_orientation == NULL);
164 
165  /* this time, we have to move to another container */
166  /* This is the container *above* 'con' (an ancestor of con) which is inside
167  * 'same_orientation' */
168  Con *above = con;
169  while (above->parent != same_orientation)
170  above = above->parent;
171 
172  DLOG("above = %p\n", above);
173  Con *next;
174  position_t position;
175  if (direction == D_UP || direction == D_LEFT) {
176  position = BEFORE;
177  next = TAILQ_PREV(above, nodes_head, nodes);
178  } else {
179  position = AFTER;
180  next = TAILQ_NEXT(above, nodes);
181  }
182 
183  /* special case: there is a split container in the direction we are moving
184  * to, so descend and append */
185  if (next && !con_is_leaf(next))
187  else
188  insert_con_into(con, above, position);
189 
190 end:
191  /* We need to call con_focus() to fix the focus stack "above" the container
192  * we just inserted the focused container into (otherwise, the parent
193  * container(s) would still point to the old container(s)). */
194  con_focus(con);
195 
196  /* force re-painting the indicators */
197  FREE(con->deco_render_params);
198 
200 }