272 lines
9.7 KiB
C
272 lines
9.7 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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* resize.c: Interactive resizing.
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*
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*/
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#include "all.h"
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/*
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* This is an ugly data structure which we need because there is no standard
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* way of having nested functions (only available as a gcc extension at the
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* moment, clang doesn’t support it) or blocks (only available as a clang
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* extension and only on Mac OS X systems at the moment).
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*
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*/
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struct callback_params {
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orientation_t orientation;
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Con *output;
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xcb_window_t helpwin;
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uint32_t *new_position;
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bool *threshold_exceeded;
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};
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DRAGGING_CB(resize_callback) {
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const struct callback_params *params = extra;
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Con *output = params->output;
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DLOG("new x = %d, y = %d\n", new_x, new_y);
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if (!*params->threshold_exceeded) {
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xcb_map_window(conn, params->helpwin);
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/* Warp pointer in the same way as resize_graphical_handler() would do
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* if threshold wasn't enabled, but also take into account travelled
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* distance. */
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if (params->orientation == HORIZ) {
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xcb_warp_pointer(conn, XCB_NONE, event->root, 0, 0, 0, 0,
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*params->new_position + new_x - event->root_x,
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new_y);
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} else {
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xcb_warp_pointer(conn, XCB_NONE, event->root, 0, 0, 0, 0,
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new_x,
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*params->new_position + new_y - event->root_y);
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}
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*params->threshold_exceeded = true;
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return;
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}
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if (params->orientation == HORIZ) {
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/* Check if the new coordinates are within screen boundaries */
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if (new_x > (output->rect.x + output->rect.width - 25) ||
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new_x < (output->rect.x + 25))
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return;
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*(params->new_position) = new_x;
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xcb_configure_window(conn, params->helpwin, XCB_CONFIG_WINDOW_X, params->new_position);
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} else {
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if (new_y > (output->rect.y + output->rect.height - 25) ||
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new_y < (output->rect.y + 25))
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return;
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*(params->new_position) = new_y;
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xcb_configure_window(conn, params->helpwin, XCB_CONFIG_WINDOW_Y, params->new_position);
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}
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xcb_flush(conn);
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}
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bool resize_find_tiling_participants(Con **current, Con **other, direction_t direction, bool both_sides) {
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DLOG("Find two participants for resizing container=%p in direction=%i\n", other, direction);
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Con *first = *current;
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Con *second = NULL;
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if (first == NULL) {
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DLOG("Current container is NULL, aborting.\n");
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return false;
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}
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/* Go up in the tree and search for a container to resize */
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const orientation_t search_orientation = orientation_from_direction(direction);
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const bool dir_backwards = (direction == D_UP || direction == D_LEFT);
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while (first->type != CT_WORKSPACE &&
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first->type != CT_FLOATING_CON &&
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second == NULL) {
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/* get the appropriate first container with the matching
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* orientation (skip stacked/tabbed cons) */
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if ((con_orientation(first->parent) != search_orientation) ||
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(first->parent->layout == L_STACKED) ||
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(first->parent->layout == L_TABBED)) {
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first = first->parent;
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continue;
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}
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/* get the counterpart for this resizement */
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if (dir_backwards) {
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second = TAILQ_PREV(first, nodes_head, nodes);
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if (second == NULL && both_sides == true) {
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second = TAILQ_NEXT(first, nodes);
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}
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} else {
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second = TAILQ_NEXT(first, nodes);
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if (second == NULL && both_sides == true) {
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second = TAILQ_PREV(first, nodes_head, nodes);
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}
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}
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if (second == NULL) {
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DLOG("No second container in this direction found, trying to look further up in the tree...\n");
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first = first->parent;
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}
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}
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DLOG("Found participants: first=%p and second=%p.\n", first, second);
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*current = first;
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*other = second;
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if (first == NULL || second == NULL) {
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DLOG("Could not find two participants for this resize request.\n");
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return false;
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}
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return true;
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}
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/*
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* Calculate the minimum percent needed for the given container to be at least 1
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* pixel.
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*
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*/
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double percent_for_1px(Con *con) {
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const int parent_size = con_rect_size_in_orientation(con->parent);
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/* deco_rect.height is subtracted from each child in render_con_split */
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const int min_size = (con_orientation(con->parent) == HORIZ ? 1 : 1 + con->deco_rect.height);
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return ((double)min_size / (double)parent_size);
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}
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/*
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* Resize the two given containers using the given amount of pixels or
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* percentage points. One of the two needs to be 0. A positive amount means
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* growing the first container while a negative means shrinking it.
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* Returns false when the resize would result in one of the two containers
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* having less than 1 pixel of size.
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*
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*/
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bool resize_neighboring_cons(Con *first, Con *second, int px, int ppt) {
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assert(px * ppt == 0);
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Con *parent = first->parent;
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double new_first_percent;
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double new_second_percent;
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if (ppt) {
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new_first_percent = first->percent + ((double)ppt / 100.0);
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new_second_percent = second->percent - ((double)ppt / 100.0);
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} else {
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/* Convert px change to change in percentages */
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const double pct = (double)px / (double)con_rect_size_in_orientation(first->parent);
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new_first_percent = first->percent + pct;
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new_second_percent = second->percent - pct;
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}
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/* Ensure that no container will be less than 1 pixel in the resizing
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* direction. */
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if (new_first_percent < percent_for_1px(first) || new_second_percent < percent_for_1px(second)) {
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return false;
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}
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first->percent = new_first_percent;
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second->percent = new_second_percent;
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con_fix_percent(parent);
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return true;
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}
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void resize_graphical_handler(Con *first, Con *second, orientation_t orientation,
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const xcb_button_press_event_t *event,
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bool use_threshold) {
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Con *output = con_get_output(first);
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DLOG("x = %d, width = %d\n", output->rect.x, output->rect.width);
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x_mask_event_mask(~XCB_EVENT_MASK_ENTER_WINDOW);
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xcb_flush(conn);
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uint32_t mask = 0;
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uint32_t values[2];
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mask = XCB_CW_OVERRIDE_REDIRECT;
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values[0] = 1;
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/* Open a new window, the resizebar. Grab the pointer and move the window
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* around as the user moves the pointer. */
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xcb_window_t grabwin = create_window(conn, output->rect, XCB_COPY_FROM_PARENT, XCB_COPY_FROM_PARENT,
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XCB_WINDOW_CLASS_INPUT_ONLY, XCURSOR_CURSOR_POINTER, true, mask, values);
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/* Keep track of the coordinate orthogonal to motion so we can determine the
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* length of the resize afterward. */
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uint32_t initial_position, new_position;
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/* Configure the resizebar and snap the pointer. The resizebar runs along
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* the rect of the second con and follows the motion of the pointer. */
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Rect helprect;
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helprect.x = second->rect.x;
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helprect.y = second->rect.y;
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if (orientation == HORIZ) {
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helprect.width = logical_px(2);
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helprect.height = second->rect.height;
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initial_position = second->rect.x;
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} else {
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helprect.width = second->rect.width;
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helprect.height = logical_px(2);
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initial_position = second->rect.y;
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}
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mask = XCB_CW_BACK_PIXEL;
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values[0] = config.client.focused.border.colorpixel;
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mask |= XCB_CW_OVERRIDE_REDIRECT;
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values[1] = 1;
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xcb_window_t helpwin = create_window(conn, helprect, XCB_COPY_FROM_PARENT, XCB_COPY_FROM_PARENT,
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XCB_WINDOW_CLASS_INPUT_OUTPUT, (orientation == HORIZ ? XCURSOR_CURSOR_RESIZE_HORIZONTAL : XCURSOR_CURSOR_RESIZE_VERTICAL), false, mask, values);
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if (!use_threshold) {
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xcb_map_window(conn, helpwin);
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if (orientation == HORIZ) {
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xcb_warp_pointer(conn, XCB_NONE, event->root, 0, 0, 0, 0,
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second->rect.x, event->root_y);
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} else {
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xcb_warp_pointer(conn, XCB_NONE, event->root, 0, 0, 0, 0,
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event->root_x, second->rect.y);
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}
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}
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xcb_circulate_window(conn, XCB_CIRCULATE_RAISE_LOWEST, helpwin);
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xcb_flush(conn);
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/* `new_position' will be updated by the `resize_callback'. */
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new_position = initial_position;
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bool threshold_exceeded = !use_threshold;
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const struct callback_params params = {orientation, output, helpwin, &new_position, &threshold_exceeded};
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/* Re-render the tree before returning to the event loop (drag_pointer()
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* runs its own event-loop) in case if there are unrendered updates. */
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tree_render();
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/* `drag_pointer' blocks until the drag is completed. */
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drag_result_t drag_result = drag_pointer(NULL, event, grabwin, 0, use_threshold, resize_callback, ¶ms);
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xcb_destroy_window(conn, helpwin);
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xcb_destroy_window(conn, grabwin);
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xcb_flush(conn);
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/* User cancelled the drag so no action should be taken. */
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if (drag_result == DRAG_REVERT) {
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return;
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}
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int pixels = (new_position - initial_position);
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DLOG("Done, pixels = %d\n", pixels);
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/* No change; no action needed. */
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if (pixels == 0) {
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return;
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}
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/* if we got thus far, the containers must have valid percentages. */
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assert(first->percent > 0.0);
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assert(second->percent > 0.0);
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const bool result = resize_neighboring_cons(first, second, pixels, 0);
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DLOG("Graphical resize %s: first->percent = %f, second->percent = %f.\n",
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result ? "successful" : "failed", first->percent, second->percent);
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}
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