gri3-wm/src/resize.c

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/*
* 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 doesnt 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;
};
DRAGGING_CB(resize_callback) {
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const struct callback_params *params = extra;
Con *output = params->output;
DLOG("new x = %d, y = %d\n", new_x, new_y);
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 = ((direction == D_LEFT || direction == D_RIGHT) ? HORIZ : VERT);
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;
}
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int resize_graphical_handler(Con *first, Con *second, orientation_t orientation, const xcb_button_press_event_t *event) {
DLOG("resize handler\n");
/* TODO: previously, we were getting a rect containing all screens. why? */
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;
if (orientation == HORIZ) {
helprect.x = second->rect.x;
helprect.y = second->rect.y;
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helprect.width = logical_px(2);
helprect.height = second->rect.height;
initial_position = second->rect.x;
xcb_warp_pointer(conn, XCB_NONE, event->root, 0, 0, 0, 0,
second->rect.x, event->root_y);
} else {
helprect.x = second->rect.x;
helprect.y = second->rect.y;
helprect.width = second->rect.width;
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helprect.height = logical_px(2);
initial_position = second->rect.y;
xcb_warp_pointer(conn, XCB_NONE, event->root, 0, 0, 0, 0,
event->root_x, 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), true, mask, values);
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;
const struct callback_params params = {orientation, output, helpwin, &new_position};
/* `drag_pointer' blocks until the drag is completed. */
drag_result_t drag_result = drag_pointer(NULL, event, grabwin, BORDER_TOP, 0, resize_callback, &params);
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 0;
int pixels = (new_position - initial_position);
DLOG("Done, pixels = %d\n", pixels);
// if we got thus far, the containers must have
// percentages associated with them
assert(first->percent > 0.0);
assert(second->percent > 0.0);
// calculate the new percentage for the first container
double new_percent, difference;
double percent = first->percent;
DLOG("percent = %f\n", percent);
int original = (orientation == HORIZ ? first->rect.width : first->rect.height);
DLOG("original = %d\n", original);
new_percent = (original + pixels) * (percent / original);
difference = percent - new_percent;
DLOG("difference = %f\n", difference);
DLOG("new percent = %f\n", new_percent);
first->percent = new_percent;
// calculate the new percentage for the second container
double s_percent = second->percent;
second->percent = s_percent + difference;
DLOG("second->percent = %f\n", second->percent);
// now we must make sure that the sum of the percentages remain 1.0
con_fix_percent(first->parent);
return 0;
}