2 * vim:ts=4:sw=4:expandtab
4 * i3 - an improved dynamic tiling window manager
5 * © 2009 Michael Stapelberg and contributors (see also: LICENSE)
7 * resize.c: Interactive resizing.
13 * This is an ugly data structure which we need because there is no standard
14 * way of having nested functions (only available as a gcc extension at the
15 * moment, clang doesn’t support it) or blocks (only available as a clang
16 * extension and only on Mac OS X systems at the moment).
19 struct callback_params {
20 orientation_t orientation;
23 uint32_t *new_position;
26 DRAGGING_CB(resize_callback) {
27 const struct callback_params *params = extra;
28 Con *output = params->output;
29 DLOG("new x = %d, y = %d\n", new_x, new_y);
30 if (params->orientation == HORIZ) {
31 /* Check if the new coordinates are within screen boundaries */
32 if (new_x > (output->rect.x + output->rect.width - 25) ||
33 new_x < (output->rect.x + 25))
36 *(params->new_position) = new_x;
37 xcb_configure_window(conn, params->helpwin, XCB_CONFIG_WINDOW_X, params->new_position);
39 if (new_y > (output->rect.y + output->rect.height - 25) ||
40 new_y < (output->rect.y + 25))
43 *(params->new_position) = new_y;
44 xcb_configure_window(conn, params->helpwin, XCB_CONFIG_WINDOW_Y, params->new_position);
50 bool resize_find_tiling_participants(Con **current, Con **other, direction_t direction, bool both_sides) {
51 DLOG("Find two participants for resizing container=%p in direction=%i\n", other, direction);
52 Con *first = *current;
55 DLOG("Current container is NULL, aborting.\n");
59 /* Go up in the tree and search for a container to resize */
60 const orientation_t search_orientation = orientation_from_direction(direction);
61 const bool dir_backwards = (direction == D_UP || direction == D_LEFT);
62 while (first->type != CT_WORKSPACE &&
63 first->type != CT_FLOATING_CON &&
65 /* get the appropriate first container with the matching
66 * orientation (skip stacked/tabbed cons) */
67 if ((con_orientation(first->parent) != search_orientation) ||
68 (first->parent->layout == L_STACKED) ||
69 (first->parent->layout == L_TABBED)) {
70 first = first->parent;
74 /* get the counterpart for this resizement */
76 second = TAILQ_PREV(first, nodes_head, nodes);
77 if (second == NULL && both_sides == true) {
78 second = TAILQ_NEXT(first, nodes);
81 second = TAILQ_NEXT(first, nodes);
82 if (second == NULL && both_sides == true) {
83 second = TAILQ_PREV(first, nodes_head, nodes);
88 DLOG("No second container in this direction found, trying to look further up in the tree...\n");
89 first = first->parent;
93 DLOG("Found participants: first=%p and second=%p.\n", first, second);
96 if (first == NULL || second == NULL) {
97 DLOG("Could not find two participants for this resize request.\n");
105 * Calculate the minimum percent needed for the given container to be at least 1
109 double percent_for_1px(Con *con) {
110 const int parent_size = con_rect_size_in_orientation(con->parent);
111 /* deco_rect.height is subtracted from each child in render_con_split */
112 const int min_size = (con_orientation(con->parent) == HORIZ ? 1 : 1 + con->deco_rect.height);
113 return ((double)min_size / (double)parent_size);
117 * Resize the two given containers using the given amount of pixels or
118 * percentage points. One of the two needs to be 0. A positive amount means
119 * growing the first container while a negative means shrinking it.
120 * Returns false when the resize would result in one of the two containers
121 * having less than 1 pixel of size.
124 bool resize_neighboring_cons(Con *first, Con *second, int px, int ppt) {
125 assert(px * ppt == 0);
127 Con *parent = first->parent;
128 double new_first_percent;
129 double new_second_percent;
131 new_first_percent = first->percent + ((double)ppt / 100.0);
132 new_second_percent = second->percent - ((double)ppt / 100.0);
134 /* Convert px change to change in percentages */
135 const double pct = (double)px / (double)con_rect_size_in_orientation(first->parent);
136 new_first_percent = first->percent + pct;
137 new_second_percent = second->percent - pct;
139 /* Ensure that no container will be less than 1 pixel in the resizing
141 if (new_first_percent < percent_for_1px(first) || new_second_percent < percent_for_1px(second)) {
145 first->percent = new_first_percent;
146 second->percent = new_second_percent;
147 con_fix_percent(parent);
151 void resize_graphical_handler(Con *first, Con *second, orientation_t orientation, const xcb_button_press_event_t *event) {
152 Con *output = con_get_output(first);
153 DLOG("x = %d, width = %d\n", output->rect.x, output->rect.width);
155 x_mask_event_mask(~XCB_EVENT_MASK_ENTER_WINDOW);
161 mask = XCB_CW_OVERRIDE_REDIRECT;
164 /* Open a new window, the resizebar. Grab the pointer and move the window
165 * around as the user moves the pointer. */
166 xcb_window_t grabwin = create_window(conn, output->rect, XCB_COPY_FROM_PARENT, XCB_COPY_FROM_PARENT,
167 XCB_WINDOW_CLASS_INPUT_ONLY, XCURSOR_CURSOR_POINTER, true, mask, values);
169 /* Keep track of the coordinate orthogonal to motion so we can determine the
170 * length of the resize afterward. */
171 uint32_t initial_position, new_position;
173 /* Configure the resizebar and snap the pointer. The resizebar runs along
174 * the rect of the second con and follows the motion of the pointer. */
176 helprect.x = second->rect.x;
177 helprect.y = second->rect.y;
178 if (orientation == HORIZ) {
179 helprect.width = logical_px(2);
180 helprect.height = second->rect.height;
181 initial_position = second->rect.x;
182 xcb_warp_pointer(conn, XCB_NONE, event->root, 0, 0, 0, 0,
183 second->rect.x, event->root_y);
185 helprect.width = second->rect.width;
186 helprect.height = logical_px(2);
187 initial_position = second->rect.y;
188 xcb_warp_pointer(conn, XCB_NONE, event->root, 0, 0, 0, 0,
189 event->root_x, second->rect.y);
192 mask = XCB_CW_BACK_PIXEL;
193 values[0] = config.client.focused.border.colorpixel;
195 mask |= XCB_CW_OVERRIDE_REDIRECT;
198 xcb_window_t helpwin = create_window(conn, helprect, XCB_COPY_FROM_PARENT, XCB_COPY_FROM_PARENT,
199 XCB_WINDOW_CLASS_INPUT_OUTPUT, (orientation == HORIZ ? XCURSOR_CURSOR_RESIZE_HORIZONTAL : XCURSOR_CURSOR_RESIZE_VERTICAL), true, mask, values);
201 xcb_circulate_window(conn, XCB_CIRCULATE_RAISE_LOWEST, helpwin);
205 /* `new_position' will be updated by the `resize_callback'. */
206 new_position = initial_position;
208 const struct callback_params params = {orientation, output, helpwin, &new_position};
210 /* `drag_pointer' blocks until the drag is completed. */
211 drag_result_t drag_result = drag_pointer(NULL, event, grabwin, BORDER_TOP, 0, resize_callback, ¶ms);
213 xcb_destroy_window(conn, helpwin);
214 xcb_destroy_window(conn, grabwin);
217 /* User cancelled the drag so no action should be taken. */
218 if (drag_result == DRAG_REVERT) {
222 int pixels = (new_position - initial_position);
223 DLOG("Done, pixels = %d\n", pixels);
225 /* No change; no action needed. */
230 /* if we got thus far, the containers must have valid percentages. */
231 assert(first->percent > 0.0);
232 assert(second->percent > 0.0);
233 const bool result = resize_neighboring_cons(first, second, pixels, 0);
234 DLOG("Graphical resize %s: first->percent = %f, second->percent = %f.\n",
235 result ? "successful" : "failed", first->percent, second->percent);