git.sur5r.net Git - i3/i3/blob - src/resize.c

   1 /*
   2  * vim:ts=8:expandtab
   3  *
   4  * i3 - an improved dynamic tiling window manager
   5  *
   6  * © 2009-2010 Michael Stapelberg and contributors
   7  *
   8  * See file LICENSE for license information.
   9  *
  10  * This file contains the functions for resizing table columns/rows because
  11  * it’s actually lots of work, compared to the other handlers.
  12  *
  13  */
  14 #include <stdlib.h>
  15 #include <assert.h>
  16
  17 #include <xcb/xcb.h>
  18
  19 #include "i3.h"
  20 #include "data.h"
  21 #include "resize.h"
  22 #include "util.h"
  23 #include "xcb.h"
  24 #include "debug.h"
  25 #include "layout.h"
  26 #include "randr.h"
  27 #include "config.h"
  28 #include "floating.h"
  29 #include "workspace.h"
  30 #include "log.h"
  31
  32 /*
  33  * This is an ugly data structure which we need because there is no standard
  34  * way of having nested functions (only available as a gcc extension at the
  35  * moment, clang doesn’t support it) or blocks (only available as a clang
  36  * extension and only on Mac OS X systems at the moment).
  37  *
  38  */
  39 struct callback_params {
  40         resize_orientation_t orientation;
  41         Output *screen;
  42         xcb_window_t helpwin;
  43         uint32_t *new_position;
  44 };
  45
  46 DRAGGING_CB(resize_callback) {
  47         struct callback_params *params = extra;
  48         Output *screen = params->screen;
  49         DLOG("new x = %d, y = %d\n", new_x, new_y);
  50         if (params->orientation == O_VERTICAL) {
  51                 /* Check if the new coordinates are within screen boundaries */
  52                 if (new_x > (screen->rect.x + screen->rect.width - 25) ||
  53                     new_x < (screen->rect.x + 25))
  54                         return;
  55
  56                 *(params->new_position) = new_x;
  57                 xcb_configure_window(conn, params->helpwin, XCB_CONFIG_WINDOW_X, params->new_position);
  58         } else {
  59                 if (new_y > (screen->rect.y + screen->rect.height - 25) ||
  60                     new_y < (screen->rect.y + 25))
  61                         return;
  62
  63                 *(params->new_position) = new_y;
  64                 xcb_configure_window(conn, params->helpwin, XCB_CONFIG_WINDOW_Y, params->new_position);
  65         }
  66
  67         xcb_flush(conn);
  68 }
  69
  70 /*
  71  * Renders the resize window between the first/second container and resizes
  72  * the table column/row.
  73  *
  74  */
  75 int resize_graphical_handler(xcb_connection_t *conn, Workspace *ws, int first, int second,
  76                              resize_orientation_t orientation, xcb_button_press_event_t *event) {
  77         uint32_t new_position;
  78         Output *screen = get_output_containing(event->root_x, event->root_y);
  79         if (screen == NULL) {
  80                 ELOG("BUG: No screen found at this position (%d, %d)\n", event->root_x, event->root_y);
  81                 return 1;
  82         }
  83
  84         /* We cannot use the X root window's width_in_pixels or height_in_pixels
  85          * attributes here since they are not updated when you configure new
  86          * screens during runtime. Instead, we just use the most right and most
  87          * bottom Xinerama screen and use their position + width/height to get
  88          * the area of pixels currently in use */
  89         Output *most_right = get_output_most(D_RIGHT, screen),
  90                *most_bottom = get_output_most(D_DOWN, screen);
  91
  92         DLOG("event->event_x = %d, event->root_x = %d\n", event->event_x, event->root_x);
  93
  94         DLOG("Screen dimensions: (%d, %d) %d x %d\n", screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
  95
  96         uint32_t mask = 0;
  97         uint32_t values[2];
  98
  99         mask = XCB_CW_OVERRIDE_REDIRECT;
 100         values[0] = 1;
 101
 102         /* Open a new window, the resizebar. Grab the pointer and move the window around
 103            as the user moves the pointer. */
 104         Rect grabrect = {0,
 105                          0,
 106                          most_right->rect.x + most_right->rect.width,
 107                          most_bottom->rect.x + most_bottom->rect.height};
 108         xcb_window_t grabwin = create_window(conn, grabrect, XCB_WINDOW_CLASS_INPUT_ONLY, -1, true, mask, values);
 109
 110         Rect helprect;
 111         if (orientation == O_VERTICAL) {
 112                 helprect.x = event->root_x;
 113                 helprect.y = screen->rect.y;
 114                 helprect.width = 2;
 115                 helprect.height = screen->rect.height;
 116                 new_position = event->root_x;
 117         } else {
 118                 helprect.x = screen->rect.x;
 119                 helprect.y = event->root_y;
 120                 helprect.width = screen->rect.width;
 121                 helprect.height = 2;
 122                 new_position = event->root_y;
 123         }
 124
 125         mask = XCB_CW_BACK_PIXEL;
 126         values[0] = config.client.focused.border;
 127
 128         mask |= XCB_CW_OVERRIDE_REDIRECT;
 129         values[1] = 1;
 130
 131         xcb_window_t helpwin = create_window(conn, helprect, XCB_WINDOW_CLASS_INPUT_OUTPUT,
 132                                              (orientation == O_VERTICAL ?
 133                                               XCB_CURSOR_SB_H_DOUBLE_ARROW :
 134                                               XCB_CURSOR_SB_V_DOUBLE_ARROW), true, mask, values);
 135
 136         xcb_circulate_window(conn, XCB_CIRCULATE_RAISE_LOWEST, helpwin);
 137
 138         xcb_flush(conn);
 139
 140         struct callback_params params = { orientation, screen, helpwin, &new_position };
 141
 142         drag_pointer(conn, NULL, event, grabwin, BORDER_TOP, resize_callback, &params);
 143
 144         xcb_destroy_window(conn, helpwin);
 145         xcb_destroy_window(conn, grabwin);
 146         xcb_flush(conn);
 147
 148         int pixels;
 149         if (orientation == O_VERTICAL)
 150                 pixels = (new_position - event->root_x);
 151         else pixels = (new_position - event->root_y);
 152         resize_container(conn, ws, first, second, orientation, pixels);
 153
 154         return 1;
 155 }
 156
 157 /*
 158  * Adjusts the container size factors according to the resizing parameters.
 159  * This is an abstraction used by resize_container.
 160  */
 161 static void adjust_container_factors(float *factors, int ws_size, int unoccupied_size,
 162                 int num_items, int first, int second, int pixels) {
 163         /* Find the current sizes */
 164         int sizes[num_items];
 165         for (int i = 0; i < num_items; ++i)
 166                 sizes[i] = factors[i] == 0 ? ws_size / num_items : unoccupied_size * factors[i];
 167
 168         /* Adjust them */
 169         sizes[first] += pixels;
 170         sizes[second] -= pixels;
 171
 172         /* Calculate the new unoccupied size */
 173         if (factors[first] == 0) unoccupied_size += ws_size / num_items;
 174         if (factors[second] == 0) unoccupied_size += ws_size / num_items;
 175
 176         /* Calculate the new factors */
 177         for (int i = 0; i < num_items; ++i) {
 178                 if (factors[i] != 0 || i == first || i == second)
 179                         factors[i] = (float)sizes[i] / unoccupied_size;
 180         }
 181 }
 182
 183 /*
 184  * Resizes a column/row by the given amount of pixels. Called by
 185  * resize_graphical_handler (the user clicked) or parse_resize_command (the
 186  * user issued the command)
 187  *
 188  */
 189 void resize_container(xcb_connection_t *conn, Workspace *ws, int first, int second,
 190                       resize_orientation_t orientation, int pixels) {
 191         if (orientation == O_VERTICAL) {
 192                 adjust_container_factors(ws->width_factor, ws->rect.width,
 193                                 get_unoccupied_x(ws), ws->cols, first, second, pixels);
 194         }
 195         else {
 196                 adjust_container_factors(ws->height_factor, workspace_height(ws),
 197                                 get_unoccupied_y(ws), ws->rows, first, second, pixels);
 198         }
 199
 200         render_layout(conn);
 201 }