/*
* vim:ts=4:sw=4:expandtab
*
* i3 - an improved dynamic tiling window manager
* © 2009 Michael Stapelberg and contributors (see also: LICENSE)
*
* resize.c: Interactive resizing.
*
*/
#include "all.h"
/*
* This is an ugly data structure which we need because there is no standard
* way of having nested functions (only available as a gcc extension at the
* moment, clang doesn’t support it) or blocks (only available as a clang
* extension and only on Mac OS X systems at the moment).
*
*/
struct callback_params {
orientation_t orientation;
Con *output;
xcb_window_t helpwin;
uint32_t *new_position;
bool *threshold_exceeded;
};
DRAGGING_CB(resize_callback) {
const struct callback_params *params = extra;
Con *output = params->output;
DLOG("new x = %d, y = %d\n", new_x, new_y);
if (!*params->threshold_exceeded) {
xcb_map_window(conn, params->helpwin);
/* Warp pointer in the same way as resize_graphical_handler() would do
* if threshold wasn't enabled, but also take into account travelled
* distance. */
if (params->orientation == HORIZ) {
xcb_warp_pointer(conn, XCB_NONE, event->root, 0, 0, 0, 0,
*params->new_position + new_x - event->root_x,
new_y);
} else {
xcb_warp_pointer(conn, XCB_NONE, event->root, 0, 0, 0, 0,
new_x,
*params->new_position + new_y - event->root_y);
}
*params->threshold_exceeded = true;
return;
}
if (params->orientation == HORIZ) {
/* Check if the new coordinates are within screen boundaries */
if (new_x > (output->rect.x + output->rect.width - 25) ||
new_x < (output->rect.x + 25))
return;
*(params->new_position) = new_x;
xcb_configure_window(conn, params->helpwin, XCB_CONFIG_WINDOW_X, params->new_position);
} else {
if (new_y > (output->rect.y + output->rect.height - 25) ||
new_y < (output->rect.y + 25))
return;
*(params->new_position) = new_y;
xcb_configure_window(conn, params->helpwin, XCB_CONFIG_WINDOW_Y, params->new_position);
}
xcb_flush(conn);
}
bool resize_find_tiling_participants(Con **current, Con **other, direction_t direction, bool both_sides) {
DLOG("Find two participants for resizing container=%p in direction=%i\n", other, direction);
Con *first = *current;
Con *second = NULL;
if (first == NULL) {
DLOG("Current container is NULL, aborting.\n");
return false;
}
/* Go up in the tree and search for a container to resize */
const orientation_t search_orientation = orientation_from_direction(direction);
const bool dir_backwards = (direction == D_UP || direction == D_LEFT);
while (first->type != CT_WORKSPACE &&
first->type != CT_FLOATING_CON &&
second == NULL) {
/* get the appropriate first container with the matching
* orientation (skip stacked/tabbed cons) */
if ((con_orientation(first->parent) != search_orientation) ||
(first->parent->layout == L_STACKED) ||
(first->parent->layout == L_TABBED)) {
first = first->parent;
continue;
}
/* get the counterpart for this resizement */
if (dir_backwards) {
second = TAILQ_PREV(first, nodes_head, nodes);
if (second == NULL && both_sides == true) {
second = TAILQ_NEXT(first, nodes);
}
} else {
second = TAILQ_NEXT(first, nodes);
if (second == NULL && both_sides == true) {
second = TAILQ_PREV(first, nodes_head, nodes);
}
}
if (second == NULL) {
DLOG("No second container in this direction found, trying to look further up in the tree...\n");
first = first->parent;
}
}
DLOG("Found participants: first=%p and second=%p.\n", first, second);
*current = first;
*other = second;
if (first == NULL || second == NULL) {
DLOG("Could not find two participants for this resize request.\n");
return false;
}
return true;
}
/*
* Calculate the minimum percent needed for the given container to be at least 1
* pixel.
*
*/
double percent_for_1px(Con *con) {
const int parent_size = con_rect_size_in_orientation(con->parent);
/* deco_rect.height is subtracted from each child in render_con_split */
const int min_size = (con_orientation(con->parent) == HORIZ ? 1 : 1 + con->deco_rect.height);
return ((double)min_size / (double)parent_size);
}
/*
* Resize the two given containers using the given amount of pixels or
* percentage points. One of the two needs to be 0. A positive amount means
* growing the first container while a negative means shrinking it.
* Returns false when the resize would result in one of the two containers
* having less than 1 pixel of size.
*
*/
bool resize_neighboring_cons(Con *first, Con *second, int px, int ppt) {
assert(px * ppt == 0);
Con *parent = first->parent;
double new_first_percent;
double new_second_percent;
if (ppt) {
new_first_percent = first->percent + ((double)ppt / 100.0);
new_second_percent = second->percent - ((double)ppt / 100.0);
} else {
/* Convert px change to change in percentages */
const double pct = (double)px / (double)con_rect_size_in_orientation(first->parent);
new_first_percent = first->percent + pct;
new_second_percent = second->percent - pct;
}
/* Ensure that no container will be less than 1 pixel in the resizing
* direction. */
if (new_first_percent < percent_for_1px(first) || new_second_percent < percent_for_1px(second)) {
return false;
}
first->percent = new_first_percent;
second->percent = new_second_percent;
con_fix_percent(parent);
return true;
}
void resize_graphical_handler(Con *first, Con *second, orientation_t orientation,
const xcb_button_press_event_t *event,
bool use_threshold) {
Con *output = con_get_output(first);
DLOG("x = %d, width = %d\n", output->rect.x, output->rect.width);
x_mask_event_mask(~XCB_EVENT_MASK_ENTER_WINDOW);
xcb_flush(conn);
uint32_t mask = 0;
uint32_t values[2];
mask = XCB_CW_OVERRIDE_REDIRECT;
values[0] = 1;
/* Open a new window, the resizebar. Grab the pointer and move the window
* around as the user moves the pointer. */
xcb_window_t grabwin = create_window(conn, output->rect, XCB_COPY_FROM_PARENT, XCB_COPY_FROM_PARENT,
XCB_WINDOW_CLASS_INPUT_ONLY, XCURSOR_CURSOR_POINTER, true, mask, values);
/* Keep track of the coordinate orthogonal to motion so we can determine the
* length of the resize afterward. */
uint32_t initial_position, new_position;
/* Configure the resizebar and snap the pointer. The resizebar runs along
* the rect of the second con and follows the motion of the pointer. */
Rect helprect;
helprect.x = second->rect.x;
helprect.y = second->rect.y;
if (orientation == HORIZ) {
helprect.width = logical_px(2);
helprect.height = second->rect.height;
initial_position = second->rect.x;
} else {
helprect.width = second->rect.width;
helprect.height = logical_px(2);
initial_position = second->rect.y;
}
mask = XCB_CW_BACK_PIXEL;
values[0] = config.client.focused.border.colorpixel;
mask |= XCB_CW_OVERRIDE_REDIRECT;
values[1] = 1;
xcb_window_t helpwin = create_window(conn, helprect, XCB_COPY_FROM_PARENT, XCB_COPY_FROM_PARENT,
XCB_WINDOW_CLASS_INPUT_OUTPUT, (orientation == HORIZ ? XCURSOR_CURSOR_RESIZE_HORIZONTAL : XCURSOR_CURSOR_RESIZE_VERTICAL), false, mask, values);
if (!use_threshold) {
xcb_map_window(conn, helpwin);
if (orientation == HORIZ) {
xcb_warp_pointer(conn, XCB_NONE, event->root, 0, 0, 0, 0,
second->rect.x, event->root_y);
} else {
xcb_warp_pointer(conn, XCB_NONE, event->root, 0, 0, 0, 0,
event->root_x, second->rect.y);
}
}
xcb_circulate_window(conn, XCB_CIRCULATE_RAISE_LOWEST, helpwin);
xcb_flush(conn);
/* `new_position' will be updated by the `resize_callback'. */
new_position = initial_position;
bool threshold_exceeded = !use_threshold;
const struct callback_params params = {orientation, output, helpwin, &new_position, &threshold_exceeded};
/* Re-render the tree before returning to the event loop (drag_pointer()
* runs its own event-loop) in case if there are unrendered updates. */
tree_render();
/* `drag_pointer' blocks until the drag is completed. */
drag_result_t drag_result = drag_pointer(NULL, event, grabwin, 0, use_threshold, resize_callback, ¶ms);
xcb_destroy_window(conn, helpwin);
xcb_destroy_window(conn, grabwin);
xcb_flush(conn);
/* User cancelled the drag so no action should be taken. */
if (drag_result == DRAG_REVERT) {
return;
}
int pixels = (new_position - initial_position);
DLOG("Done, pixels = %d\n", pixels);
/* No change; no action needed. */
if (pixels == 0) {
return;
}
/* if we got thus far, the containers must have valid percentages. */
assert(first->percent > 0.0);
assert(second->percent > 0.0);
const bool result = resize_neighboring_cons(first, second, pixels, 0);
DLOG("Graphical resize %s: first->percent = %f, second->percent = %f.\n",
result ? "successful" : "failed", first->percent, second->percent);
}