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 given container's new percent given a change in pixels.
108 double px_resize_to_percent(Con *con, int px_diff) {
109 Con *parent = con->parent;
110 const orientation_t o = con_orientation(parent);
111 const int total = (o == HORIZ ? parent->rect.width : parent->rect.height);
112 /* deco_rect.height is subtracted from each child in render_con_split */
113 const int target = px_diff + (o == HORIZ ? con->rect.width : con->rect.height + con->deco_rect.height);
114 return ((double)target / (double)total);
118 * Calculate the minimum percent needed for the given container to be at least 1
122 double percent_for_1px(Con *con) {
123 Con *parent = con->parent;
124 const orientation_t o = con_orientation(parent);
125 const int total = (o == HORIZ ? parent->rect.width : parent->rect.height);
126 const int target = (o == HORIZ ? 1 : 1 + con->deco_rect.height);
127 return ((double)target / (double)total);
131 * Resize the two given containers using the given amount of pixels or
132 * percentage points. One of the two needs to be 0. A positive amount means
133 * growing the first container while a negative means shrinking it.
134 * Returns false when the resize would result in one of the two containers
135 * having less than 1 pixel of size.
138 bool resize_neighboring_cons(Con *first, Con *second, int px, int ppt) {
139 assert(px * ppt == 0);
141 Con *parent = first->parent;
142 double new_first_percent;
143 double new_second_percent;
145 new_first_percent = first->percent + ((double)ppt / 100.0);
146 new_second_percent = second->percent - ((double)ppt / 100.0);
148 new_first_percent = px_resize_to_percent(first, px);
149 new_second_percent = second->percent + first->percent - new_first_percent;
151 /* Ensure that no container will be less than 1 pixel in the resizing
153 if (new_first_percent < percent_for_1px(first) || new_second_percent < percent_for_1px(second)) {
157 first->percent = new_first_percent;
158 second->percent = new_second_percent;
159 con_fix_percent(parent);
163 void resize_graphical_handler(Con *first, Con *second, orientation_t orientation, const xcb_button_press_event_t *event) {
164 Con *output = con_get_output(first);
165 DLOG("x = %d, width = %d\n", output->rect.x, output->rect.width);
167 x_mask_event_mask(~XCB_EVENT_MASK_ENTER_WINDOW);
173 mask = XCB_CW_OVERRIDE_REDIRECT;
176 /* Open a new window, the resizebar. Grab the pointer and move the window
177 * around as the user moves the pointer. */
178 xcb_window_t grabwin = create_window(conn, output->rect, XCB_COPY_FROM_PARENT, XCB_COPY_FROM_PARENT,
179 XCB_WINDOW_CLASS_INPUT_ONLY, XCURSOR_CURSOR_POINTER, true, mask, values);
181 /* Keep track of the coordinate orthogonal to motion so we can determine the
182 * length of the resize afterward. */
183 uint32_t initial_position, new_position;
185 /* Configure the resizebar and snap the pointer. The resizebar runs along
186 * the rect of the second con and follows the motion of the pointer. */
188 helprect.x = second->rect.x;
189 helprect.y = second->rect.y;
190 if (orientation == HORIZ) {
191 helprect.width = logical_px(2);
192 helprect.height = second->rect.height;
193 initial_position = second->rect.x;
194 xcb_warp_pointer(conn, XCB_NONE, event->root, 0, 0, 0, 0,
195 second->rect.x, event->root_y);
197 helprect.width = second->rect.width;
198 helprect.height = logical_px(2);
199 initial_position = second->rect.y;
200 xcb_warp_pointer(conn, XCB_NONE, event->root, 0, 0, 0, 0,
201 event->root_x, second->rect.y);
204 mask = XCB_CW_BACK_PIXEL;
205 values[0] = config.client.focused.border.colorpixel;
207 mask |= XCB_CW_OVERRIDE_REDIRECT;
210 xcb_window_t helpwin = create_window(conn, helprect, XCB_COPY_FROM_PARENT, XCB_COPY_FROM_PARENT,
211 XCB_WINDOW_CLASS_INPUT_OUTPUT, (orientation == HORIZ ? XCURSOR_CURSOR_RESIZE_HORIZONTAL : XCURSOR_CURSOR_RESIZE_VERTICAL), true, mask, values);
213 xcb_circulate_window(conn, XCB_CIRCULATE_RAISE_LOWEST, helpwin);
217 /* `new_position' will be updated by the `resize_callback'. */
218 new_position = initial_position;
220 const struct callback_params params = {orientation, output, helpwin, &new_position};
222 /* `drag_pointer' blocks until the drag is completed. */
223 drag_result_t drag_result = drag_pointer(NULL, event, grabwin, BORDER_TOP, 0, resize_callback, ¶ms);
225 xcb_destroy_window(conn, helpwin);
226 xcb_destroy_window(conn, grabwin);
229 /* User cancelled the drag so no action should be taken. */
230 if (drag_result == DRAG_REVERT) {
234 int pixels = (new_position - initial_position);
235 DLOG("Done, pixels = %d\n", pixels);
237 /* if we got thus far, the containers must have valid percentages. */
238 assert(first->percent > 0.0);
239 assert(second->percent > 0.0);
240 const bool result = resize_neighboring_cons(first, second, pixels, 0);
241 DLOG("Graphical resize %s: first->percent = %f, second->percent = %f.\n",
242 result ? "successful" : "failed", first->percent, second->percent);