i3
resize.c
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1 #undef I3__FILE__
2 #define I3__FILE__ "resize.c"
3 /*
4  * vim:ts=4:sw=4:expandtab
5  *
6  * i3 - an improved dynamic tiling window manager
7  * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
8  *
9  * resize.c: Interactive resizing.
10  *
11  */
12 #include "all.h"
13 
14 extern xcb_connection_t *conn;
15 
16 /*
17  * This is an ugly data structure which we need because there is no standard
18  * way of having nested functions (only available as a gcc extension at the
19  * moment, clang doesn’t support it) or blocks (only available as a clang
20  * extension and only on Mac OS X systems at the moment).
21  *
22  */
26  xcb_window_t helpwin;
27  uint32_t *new_position;
28 };
29 
30 DRAGGING_CB(resize_callback) {
31  const struct callback_params *params = extra;
32  Con *output = params->output;
33  DLOG("new x = %d, y = %d\n", new_x, new_y);
34  if (params->orientation == HORIZ) {
35  /* Check if the new coordinates are within screen boundaries */
36  if (new_x > (output->rect.x + output->rect.width - 25) ||
37  new_x < (output->rect.x + 25))
38  return;
39 
40  *(params->new_position) = new_x;
41  xcb_configure_window(conn, params->helpwin, XCB_CONFIG_WINDOW_X, params->new_position);
42  } else {
43  if (new_y > (output->rect.y + output->rect.height - 25) ||
44  new_y < (output->rect.y + 25))
45  return;
46 
47  *(params->new_position) = new_y;
48  xcb_configure_window(conn, params->helpwin, XCB_CONFIG_WINDOW_Y, params->new_position);
49  }
50 
51  xcb_flush(conn);
52 }
53 
54 bool resize_find_tiling_participants(Con **current, Con **other, direction_t direction) {
55  DLOG("Find two participants for resizing container=%p in direction=%i\n", other, direction);
56  Con *first = *current;
57  Con *second = NULL;
58  if (first == NULL) {
59  DLOG("Current container is NULL, aborting.\n");
60  return false;
61  }
62 
63  /* Go up in the tree and search for a container to resize */
64  const orientation_t search_orientation = ((direction == D_LEFT || direction == D_RIGHT) ? HORIZ : VERT);
65  const bool dir_backwards = (direction == D_UP || direction == D_LEFT);
66  while (first->type != CT_WORKSPACE &&
67  first->type != CT_FLOATING_CON &&
68  second == NULL) {
69  /* get the appropriate first container with the matching
70  * orientation (skip stacked/tabbed cons) */
71  if ((con_orientation(first->parent) != search_orientation) ||
72  (first->parent->layout == L_STACKED) ||
73  (first->parent->layout == L_TABBED)) {
74  first = first->parent;
75  continue;
76  }
77 
78  /* get the counterpart for this resizement */
79  if (dir_backwards) {
80  second = TAILQ_PREV(first, nodes_head, nodes);
81  } else {
82  second = TAILQ_NEXT(first, nodes);
83  }
84 
85  if (second == NULL) {
86  DLOG("No second container in this direction found, trying to look further up in the tree...\n");
87  first = first->parent;
88  }
89  }
90 
91  DLOG("Found participants: first=%p and second=%p.", first, second);
92  *current = first;
93  *other = second;
94  if (first == NULL || second == NULL) {
95  DLOG("Could not find two participants for this resize request.\n");
96  return false;
97  }
98 
99  return true;
100 }
101 
102 int resize_graphical_handler(Con *first, Con *second, orientation_t orientation, const xcb_button_press_event_t *event) {
103  DLOG("resize handler\n");
104 
105  uint32_t new_position;
106 
107  /* TODO: previously, we were getting a rect containing all screens. why? */
108  Con *output = con_get_output(first);
109  DLOG("x = %d, width = %d\n", output->rect.x, output->rect.width);
110 
111  x_mask_event_mask(~XCB_EVENT_MASK_ENTER_WINDOW);
112  xcb_flush(conn);
113 
114  uint32_t mask = 0;
115  uint32_t values[2];
116 
117  mask = XCB_CW_OVERRIDE_REDIRECT;
118  values[0] = 1;
119 
120  /* Open a new window, the resizebar. Grab the pointer and move the window around
121  as the user moves the pointer. */
122  xcb_window_t grabwin = create_window(conn, output->rect, XCB_COPY_FROM_PARENT, XCB_COPY_FROM_PARENT,
123  XCB_WINDOW_CLASS_INPUT_ONLY, XCURSOR_CURSOR_POINTER, true, mask, values);
124 
125  Rect helprect;
126  if (orientation == HORIZ) {
127  helprect.x = event->root_x;
128  helprect.y = output->rect.y;
129  helprect.width = 2;
130  helprect.height = output->rect.height;
131  new_position = event->root_x;
132  } else {
133  helprect.x = output->rect.x;
134  helprect.y = event->root_y;
135  helprect.width = output->rect.width;
136  helprect.height = 2;
137  new_position = event->root_y;
138  }
139 
140  mask = XCB_CW_BACK_PIXEL;
141  values[0] = config.client.focused.border;
142 
143  mask |= XCB_CW_OVERRIDE_REDIRECT;
144  values[1] = 1;
145 
146  xcb_window_t helpwin = create_window(conn, helprect, XCB_COPY_FROM_PARENT, XCB_COPY_FROM_PARENT,
147  XCB_WINDOW_CLASS_INPUT_OUTPUT, (orientation == HORIZ ?
149  XCURSOR_CURSOR_RESIZE_VERTICAL), true, mask, values);
150 
151  xcb_circulate_window(conn, XCB_CIRCULATE_RAISE_LOWEST, helpwin);
152 
153  xcb_flush(conn);
154 
155  const struct callback_params params = { orientation, output, helpwin, &new_position };
156 
157  drag_result_t drag_result = drag_pointer(NULL, event, grabwin, BORDER_TOP, 0, resize_callback, &params);
158 
159  xcb_destroy_window(conn, helpwin);
160  xcb_destroy_window(conn, grabwin);
161  xcb_flush(conn);
162 
163  /* User cancelled the drag so no action should be taken. */
164  if (drag_result == DRAG_REVERT)
165  return 0;
166 
167  int pixels;
168  if (orientation == HORIZ)
169  pixels = (new_position - event->root_x);
170  else pixels = (new_position - event->root_y);
171 
172  DLOG("Done, pixels = %d\n", pixels);
173 
174  // if we got thus far, the containers must have
175  // percentages associated with them
176  assert(first->percent > 0.0);
177  assert(second->percent > 0.0);
178 
179  // calculate the new percentage for the first container
180  double new_percent, difference;
181  double percent = first->percent;
182  DLOG("percent = %f\n", percent);
183  int original = (orientation == HORIZ ? first->rect.width : first->rect.height);
184  DLOG("original = %d\n", original);
185  new_percent = (original + pixels) * (percent / original);
186  difference = percent - new_percent;
187  DLOG("difference = %f\n", difference);
188  DLOG("new percent = %f\n", new_percent);
189  first->percent = new_percent;
190 
191  // calculate the new percentage for the second container
192  double s_percent = second->percent;
193  second->percent = s_percent + difference;
194  DLOG("second->percent = %f\n", second->percent);
195 
196  // now we must make sure that the sum of the percentages remain 1.0
197  con_fix_percent(first->parent);
198 
199  return 0;
200 }