Dogcows Code - chaz/tint2/blob - src/util/area.c

   1 /**************************************************************************
   2 *
   3 * Tint2 : area
   4 *
   5 * Copyright (C) 2008 thierry lorthiois (lorthiois@bbsoft.fr)
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License version 2
   9 * as published by the Free Software Foundation.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18 **************************************************************************/
  19
  20 #include <X11/Xlib.h>
  21 #include <X11/Xutil.h>
  22 #include <X11/Xatom.h>
  23 #include <X11/extensions/Xrender.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <pango/pangocairo.h>
  28
  29 #include "area.h"
  30 #include "server.h"
  31 #include "panel.h"
  32
  33
  34 /************************************************************
  35  * !!! This design is experimental and not yet fully implemented !!!!!!!!!!!!!
  36  *
  37  * DATA ORGANISATION :
  38  * Areas in tint2 are similar to widgets in a GUI.
  39  * All graphical objects (panel, taskbar, task, systray, clock, ...) 'inherit' an abstract class 'Area'.
  40  * This class 'Area' manage the background, border, size, position and padding.
  41  * Area is at the begining of each object (&object == &area).
  42  *
  43  * tint2 define one panel per monitor. And each panel have a tree of Area.
  44  * The root of the tree is Panel.Area. And task, clock, systray, taskbar,... are nodes.
  45  *
  46  * The tree give the localisation of each object :
  47  * - tree's root is in the background while tree's leafe are foreground objects
  48  * - position of a node/Area depend on the layout : parent's position (posx, posy), size of previous brothers and parent's padding
  49  * - size of a node/Area depend on the content (SIZE_BY_CONTENT objects) or on the layout (SIZE_BY_LAYOUT objects)
  50  *
  51  * DRAWING AND LAYERING ENGINE :
  52  * Redrawing an object (like the clock) could come from an 'external event' (date change)
  53  * or from a 'layering event' (position change).
  54  * The following 'drawing engine' take care of all 'layering event'.
  55  * 1) browse tree SIZE_BY_CONTENT
  56  *  - resize SIZE_BY_CONTENT node : children are resized before parent
  57  *      - if 'size' changed then 'resize = 1' on the parent
  58  * 2) browse tree SIZE_BY_LAYOUT and POSITION
  59  *  - resize SIZE_BY_LAYOUT node : parent is resized before children
  60  *      - if 'size' changed then 'resize = 1' on childs with SIZE_BY_LAYOUT
  61  *  - calculate position (posx,posy) : parent is calculated before children
  62  *      - if 'position' changed then 'redraw = 1'
  63  * 3) browse tree REDRAW
  64  *  - redraw needed objects : parent is drawn before children
  65  *
  66  * CONFIGURE PANEL'S LAYOUT :
  67  * 'panel_items' parameter (in config) define the list and the order of nodes in tree's panel.
  68  * 'panel_items = SC' define a panel with just Systray and Clock.
  69  * So the tree 'Panel.Area' will have 2 childs (Systray and Clock).
  70  *
  71  * 1) ok
  72  * 2) ??
  73  * 3) ??
  74  * répartition entre niveau global et niveau local ??
  75  *   size_by_content peut-il modifier redraw=1 en cas de changement ? ou est ce géré par chaque composant ?
  76  *   size_by_layout peut-il modifier redraw ?
  77  *
  78  ************************************************************/
  79
  80 void rendering(void *obj)
  81 {
  82         Panel *panel = (Panel*)obj;
  83
  84         size_by_content(&panel->area);
  85         size_by_layout(&panel->area, 0, 0);
  86
  87         refresh(&panel->area);
  88 }
  89
  90
  91 void size_by_content (Area *a)
  92 {
  93         // don't resize hiden objects
  94         if (!a->on_screen) return;
  95
  96         // children node are resized before its parent
  97         GSList *l;
  98         for (l = a->list; l ; l = l->next)
  99                 size_by_content(l->data);
 100
 101         // calculate area's size
 102         if (a->resize && a->size_mode == SIZE_BY_CONTENT) {
 103                 a->resize = 0;
 104
 105                 if (a->_resize) {
 106                         if (a->_resize(a)) {
 107                                 // 'size' changed => 'resize = 1' on the parent and redraw object
 108                                 ((Area*)a->parent)->resize = 1;
 109                                 a->redraw = 1;
 110                         }
 111                 }
 112         }
 113 }
 114
 115
 116 void size_by_layout (Area *a, int pos, int level)
 117 {
 118         // don't resize hiden objects
 119         if (!a->on_screen) return;
 120
 121         // parent node is resized before its children
 122         // calculate area's size
 123         GSList *l;
 124         if (a->resize && a->size_mode == SIZE_BY_LAYOUT) {
 125                 a->resize = 0;
 126
 127                 if (a->_resize) {
 128                         if (a->_resize(a)) {
 129                                 // if 'size' changed then 'resize = 1' on childs with SIZE_BY_LAYOUT
 130                                 for (l = a->list; l ; l = l->next) {
 131                                         if (((Area*)l->data)->size_mode == SIZE_BY_LAYOUT)
 132                                                 ((Area*)l->data)->resize = 1;
 133                                 }
 134                         }
 135                 }
 136         }
 137
 138         // update position of childs
 139         pos += a->paddingxlr + a->bg->border.width;
 140         int i=0;
 141         for (l = a->list; l ; l = l->next) {
 142                 Area *child = ((Area*)l->data);
 143                 i++;
 144
 145                 if (pos != child->posx) {
 146                         // pos changed => redraw
 147                         child->posx = pos;
 148                         child->redraw = 1;
 149                 }
 150                 //printf("level %d, object %d, pos %d\n", level, i, pos);
 151
 152                 size_by_layout(child, pos, level+1);
 153
 154                 pos += child->width + a->paddingx;
 155         }
 156 }
 157
 158
 159 void refresh (Area *a)
 160 {
 161         // don't draw and resize hide objects
 162         if (!a->on_screen) return;
 163
 164         // don't draw transparent objects (without foreground and without background)
 165         if (a->redraw) {
 166                 a->redraw = 0;
 167                 // force redraw of child
 168                 GSList *l;
 169                 for (l = a->list ; l ; l = l->next)
 170                         ((Area*)l->data)->redraw = 1;
 171 //                      set_redraw(l->data);
 172
 173                 //printf("draw area posx %d, width %d\n", a->posx, a->width);
 174                 draw(a);
 175         }
 176
 177         // draw current Area
 178         if (a->pix == 0) printf("empty area posx %d, width %d\n", a->posx, a->width);
 179         XCopyArea (server.dsp, a->pix, ((Panel *)a->panel)->temp_pmap, server.gc, 0, 0, a->width, a->height, a->posx, a->posy);
 180
 181         // and then refresh child object
 182         GSList *l;
 183         for (l = a->list; l ; l = l->next)
 184                 refresh(l->data);
 185 }
 186
 187
 188 void set_redraw (Area *a)
 189 {
 190         a->redraw = 1;
 191
 192         GSList *l;
 193         for (l = a->list ; l ; l = l->next)
 194                 set_redraw(l->data);
 195 }
 196
 197
 198 void draw (Area *a)
 199 {
 200         if (a->pix) XFreePixmap (server.dsp, a->pix);
 201         a->pix = XCreatePixmap (server.dsp, server.root_win, a->width, a->height, server.depth);
 202
 203         // add layer of root pixmap (or clear pixmap if real_transparency==true)
 204         if (server.real_transparency)
 205                 clear_pixmap(a->pix, 0 ,0, a->width, a->height);
 206         XCopyArea (server.dsp, ((Panel *)a->panel)->temp_pmap, a->pix, server.gc, a->posx, a->posy, a->width, a->height, 0, 0);
 207
 208         cairo_surface_t *cs;
 209         cairo_t *c;
 210
 211         cs = cairo_xlib_surface_create (server.dsp, a->pix, server.visual, a->width, a->height);
 212         c = cairo_create (cs);
 213
 214         draw_background (a, c);
 215
 216         if (a->_draw_foreground)
 217                 a->_draw_foreground(a, c);
 218
 219         cairo_destroy (c);
 220         cairo_surface_destroy (cs);
 221 }
 222
 223
 224 void draw_background (Area *a, cairo_t *c)
 225 {
 226         if (a->bg->back.alpha > 0.0) {
 227                 //printf("    draw_background (%d %d) RGBA (%lf, %lf, %lf, %lf)\n", a->posx, a->posy, pix->back.color[0], pix->back.color[1], pix->back.color[2], pix->back.alpha);
 228                 draw_rect(c, a->bg->border.width, a->bg->border.width, a->width-(2.0 * a->bg->border.width), a->height-(2.0*a->bg->border.width), a->bg->border.rounded - a->bg->border.width/1.571);
 229                 cairo_set_source_rgba(c, a->bg->back.color[0], a->bg->back.color[1], a->bg->back.color[2], a->bg->back.alpha);
 230                 cairo_fill(c);
 231         }
 232
 233         if (a->bg->border.width > 0 && a->bg->border.alpha > 0.0) {
 234                 cairo_set_line_width (c, a->bg->border.width);
 235
 236                 // draw border inside (x, y, width, height)
 237                 draw_rect(c, a->bg->border.width/2.0, a->bg->border.width/2.0, a->width - a->bg->border.width, a->height - a->bg->border.width, a->bg->border.rounded);
 238                 /*
 239                 // convert : radian = degre * M_PI/180
 240                 // definir le degrade dans un carre de (0,0) (100,100)
 241                 // ensuite ce degrade est extrapoler selon le ratio width/height
 242                 // dans repere (0, 0) (100, 100)
 243                 double X0, Y0, X1, Y1, degre;
 244                 // x = X * (a->width / 100), y = Y * (a->height / 100)
 245                 double x0, y0, x1, y1;
 246                 X0 = 0;
 247                 Y0 = 100;
 248                 X1 = 100;
 249                 Y1 = 0;
 250                 degre = 45;
 251                 // et ensuite faire la changement d'unite du repere
 252                 // car ce qui doit reste inchangee est les traits et pas la direction
 253
 254                 // il faut d'abord appliquer une rotation de 90 (et -180 si l'angle est superieur a  180)
 255                 // ceci peut etre applique une fois pour toute au depart
 256                 // ensuite calculer l'angle dans le nouveau repare
 257                 // puis faire une rotation de 90
 258                 x0 = X0 * ((double)a->width / 100);
 259                 x1 = X1 * ((double)a->width / 100);
 260                 y0 = Y0 * ((double)a->height / 100);
 261                 y1 = Y1 * ((double)a->height / 100);
 262
 263                 x0 = X0 * ((double)a->height / 100);
 264                 x1 = X1 * ((double)a->height / 100);
 265                 y0 = Y0 * ((double)a->width / 100);
 266                 y1 = Y1 * ((double)a->width / 100);
 267
 268                 cairo_pattern_t *linpat;
 269                 linpat = cairo_pattern_create_linear (x0, y0, x1, y1);
 270                 cairo_pattern_add_color_stop_rgba (linpat, 0, a->border.color[0], a->border.color[1], a->border.color[2], a->border.alpha);
 271                 cairo_pattern_add_color_stop_rgba (linpat, 1, a->border.color[0], a->border.color[1], a->border.color[2], 0);
 272                 cairo_set_source (c, linpat);
 273                 */
 274                 cairo_set_source_rgba (c, a->bg->border.color[0], a->bg->border.color[1], a->bg->border.color[2], a->bg->border.alpha);
 275
 276                 cairo_stroke (c);
 277                 //cairo_pattern_destroy (linpat);
 278         }
 279 }
 280
 281
 282 void remove_area (Area *a)
 283 {
 284         Area *parent = (Area*)a->parent;
 285
 286         parent->list = g_slist_remove(parent->list, a);
 287         set_redraw (parent);
 288
 289 }
 290
 291
 292 void add_area (Area *a)
 293 {
 294         Area *parent = (Area*)a->parent;
 295
 296         parent->list = g_slist_remove(parent->list, a);
 297         set_redraw (parent);
 298
 299 }
 300
 301
 302 void free_area (Area *a)
 303 {
 304         GSList *l0;
 305         for (l0 = a->list; l0 ; l0 = l0->next)
 306                 free_area (l0->data);
 307
 308         if (a->list) {
 309                 g_slist_free(a->list);
 310                 a->list = 0;
 311         }
 312         if (a->pix) {
 313                 XFreePixmap (server.dsp, a->pix);
 314                 a->pix = 0;
 315         }
 316 }
 317
 318
 319 void draw_rect(cairo_t *c, double x, double y, double w, double h, double r)
 320 {
 321         if (r > 0.0) {
 322                 double c1 = 0.55228475 * r;
 323
 324                 cairo_move_to(c, x+r, y);
 325                 cairo_rel_line_to(c, w-2*r, 0);
 326                 cairo_rel_curve_to(c, c1, 0.0, r, c1, r, r);
 327                 cairo_rel_line_to(c, 0, h-2*r);
 328                 cairo_rel_curve_to(c, 0.0, c1, c1-r, r, -r, r);
 329                 cairo_rel_line_to (c, -w +2*r, 0);
 330                 cairo_rel_curve_to (c, -c1, 0, -r, -c1, -r, -r);
 331                 cairo_rel_line_to (c, 0, -h + 2 * r);
 332                 cairo_rel_curve_to (c, 0, -c1, r - c1, -r, r, -r);
 333         }
 334         else
 335                 cairo_rectangle(c, x, y, w, h);
 336 }
 337
 338
 339 void clear_pixmap(Pixmap p, int x, int y, int w, int h)
 340 {
 341         Picture pict = XRenderCreatePicture(server.dsp, p, XRenderFindVisualFormat(server.dsp, server.visual), 0, 0);
 342         XRenderColor col = { .red=0, .green=0, .blue=0, .alpha=0 };
 343         XRenderFillRectangle(server.dsp, PictOpSrc, pict, &col, x, y, w, h);
 344         XRenderFreePicture(server.dsp, pict);
 345 }