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 #include <xcb/xcb_event.h>
  19
  20 #include "i3.h"
  21 #include "data.h"
  22 #include "resize.h"
  23 #include "util.h"
  24 #include "xcb.h"
  25 #include "debug.h"
  26 #include "layout.h"
  27 #include "randr.h"
  28 #include "config.h"
  29 #include "floating.h"
  30 #include "workspace.h"
  31 #include "log.h"
  32
  33 /*
  34  * This is an ugly data structure which we need because there is no standard
  35  * way of having nested functions (only available as a gcc extension at the
  36  * moment, clang doesn’t support it) or blocks (only available as a clang
  37  * extension and only on Mac OS X systems at the moment).
  38  *
  39  */
  40 struct callback_params {
  41         resize_orientation_t orientation;
  42         Output *screen;
  43         xcb_window_t helpwin;
  44         uint32_t *new_position;
  45 };
  46
  47 DRAGGING_CB(resize_callback) {
  48         struct callback_params *params = extra;
  49         Output *screen = params->screen;
  50         DLOG("new x = %d, y = %d\n", new_x, new_y);
  51         if (params->orientation == O_VERTICAL) {
  52                 /* Check if the new coordinates are within screen boundaries */
  53                 if (new_x > (screen->rect.x + screen->rect.width - 25) ||
  54                     new_x < (screen->rect.x + 25))
  55                         return;
  56
  57                 *(params->new_position) = new_x;
  58                 xcb_configure_window(conn, params->helpwin, XCB_CONFIG_WINDOW_X, params->new_position);
  59         } else {
  60                 if (new_y > (screen->rect.y + screen->rect.height - 25) ||
  61                     new_y < (screen->rect.y + 25))
  62                         return;
  63
  64                 *(params->new_position) = new_y;
  65                 xcb_configure_window(conn, params->helpwin, XCB_CONFIG_WINDOW_Y, params->new_position);
  66         }
  67
  68         xcb_flush(conn);
  69 }
  70
  71 /*
  72  * Renders the resize window between the first/second container and resizes
  73  * the table column/row.
  74  *
  75  */
  76 int resize_graphical_handler(xcb_connection_t *conn, Workspace *ws, int first, int second,
  77                              resize_orientation_t orientation, xcb_button_press_event_t *event) {
  78         uint32_t new_position;
  79         Output *screen = get_output_containing(event->root_x, event->root_y);
  80         if (screen == NULL) {
  81                 ELOG("BUG: No screen found at this position (%d, %d)\n", event->root_x, event->root_y);
  82                 return 1;
  83         }
  84
  85         /* We cannot use the X root window's width_in_pixels or height_in_pixels
  86          * attributes here since they are not updated when you configure new
  87          * screens during runtime. Instead, we just use the most right and most
  88          * bottom Xinerama screen and use their position + width/height to get
  89          * the area of pixels currently in use */
  90         Output *most_right = get_output_most(D_RIGHT, screen),
  91                *most_bottom = get_output_most(D_DOWN, screen);
  92
  93         DLOG("event->event_x = %d, event->root_x = %d\n", event->event_x, event->root_x);
  94
  95         DLOG("Screen dimensions: (%d, %d) %d x %d\n", screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
  96
  97         uint32_t mask = 0;
  98         uint32_t values[2];
  99
 100         mask = XCB_CW_OVERRIDE_REDIRECT;
 101         values[0] = 1;
 102
 103         /* Open a new window, the resizebar. Grab the pointer and move the window around
 104            as the user moves the pointer. */
 105         Rect grabrect = {0,
 106                          0,
 107                          most_right->rect.x + most_right->rect.width,
 108                          most_bottom->rect.x + most_bottom->rect.height};
 109         xcb_window_t grabwin = create_window(conn, grabrect, XCB_WINDOW_CLASS_INPUT_ONLY, -1, true, mask, values);
 110
 111         Rect helprect;
 112         if (orientation == O_VERTICAL) {
 113                 helprect.x = event->root_x;
 114                 helprect.y = screen->rect.y;
 115                 helprect.width = 2;
 116                 helprect.height = screen->rect.height;
 117                 new_position = event->root_x;
 118         } else {
 119                 helprect.x = screen->rect.x;
 120                 helprect.y = event->root_y;
 121                 helprect.width = screen->rect.width;
 122                 helprect.height = 2;
 123                 new_position = event->root_y;
 124         }
 125
 126         mask = XCB_CW_BACK_PIXEL;
 127         values[0] = config.client.focused.border;
 128
 129         mask |= XCB_CW_OVERRIDE_REDIRECT;
 130         values[1] = 1;
 131
 132         xcb_window_t helpwin = create_window(conn, helprect, XCB_WINDOW_CLASS_INPUT_OUTPUT,
 133                                              (orientation == O_VERTICAL ?
 134                                               XCB_CURSOR_SB_H_DOUBLE_ARROW :
 135                                               XCB_CURSOR_SB_V_DOUBLE_ARROW), true, mask, values);
 136
 137         xcb_circulate_window(conn, XCB_CIRCULATE_RAISE_LOWEST, helpwin);
 138
 139         xcb_flush(conn);
 140
 141         struct callback_params params = { orientation, screen, helpwin, &new_position };
 142
 143         drag_pointer(conn, NULL, event, grabwin, BORDER_TOP, resize_callback, &params);
 144
 145         xcb_destroy_window(conn, helpwin);
 146         xcb_destroy_window(conn, grabwin);
 147         xcb_flush(conn);
 148
 149         int pixels;
 150         if (orientation == O_VERTICAL)
 151                 pixels = (new_position - event->root_x);
 152         else pixels = (new_position - event->root_y);
 153         resize_container(conn, ws, first, second, orientation, pixels);
 154
 155         return 1;
 156 }
 157
 158 /*
 159  * Adjusts the container size factors according to the resizing parameters.
 160  * This is an abstraction used by resize_container.
 161  */
 162 static void adjust_container_factors(float *factors, int ws_size, int unoccupied_size,
 163                 int num_items, int first, int second, int pixels) {
 164         /* Find the current sizes */
 165         int sizes[num_items];
 166         for (int i = 0; i < num_items; ++i)
 167                 sizes[i] = factors[i] == 0 ? ws_size / num_items : unoccupied_size * factors[i];
 168
 169         /* Adjust them */
 170         sizes[first] += pixels;
 171         sizes[second] -= pixels;
 172
 173         /* Calculate the new unoccupied size */
 174         if (factors[first] == 0) unoccupied_size += ws_size / num_items;
 175         if (factors[second] == 0) unoccupied_size += ws_size / num_items;
 176
 177         /* Calculate the new factors */
 178         for (int i = 0; i < num_items; ++i) {
 179                 if (factors[i] != 0 || i == first || i == second)
 180                         factors[i] = (float)sizes[i] / unoccupied_size;
 181         }
 182 }
 183
 184 /*
 185  * Resizes a column/row by the given amount of pixels. Called by
 186  * resize_graphical_handler (the user clicked) or parse_resize_command (the
 187  * user issued the command)
 188  *
 189  */
 190 void resize_container(xcb_connection_t *conn, Workspace *ws, int first, int second,
 191                       resize_orientation_t orientation, int pixels) {
 192         if (orientation == O_VERTICAL) {
 193                 adjust_container_factors(ws->width_factor, ws->rect.width,
 194                                 get_unoccupied_x(ws), ws->cols, first, second, pixels);
 195         }
 196         else {
 197                 adjust_container_factors(ws->height_factor, workspace_height(ws),
 198                                 get_unoccupied_y(ws), ws->rows, first, second, pixels);
 199         }
 200
 201         render_layout(conn);
 202 }