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  ************************************************************/
  72
  73 void rendering(void *obj)
  74 {
  75         Panel *panel = (Panel*)obj;
  76
  77         size_by_content(&panel->area);
  78         size_by_layout(&panel->area, 0, 0);
  79
  80         refresh(&panel->area);
  81 }
  82
  83
  84 void size_by_content (Area *a)
  85 {
  86         // don't resize hiden objects
  87         if (!a->on_screen) return;
  88
  89         // children node are resized before its parent
  90         GSList *l;
  91         for (l = a->list; l ; l = l->next)
  92                 size_by_content(l->data);
  93
  94         // calculate area's size
  95         if (a->resize && a->size_mode == SIZE_BY_CONTENT) {
  96                 a->resize = 0;
  97
  98                 if (a->_resize) {
  99                         if (a->_resize(a)) {
 100                                 // 'size' changed => 'resize = 1' on the parent and redraw object
 101                                 ((Area*)a->parent)->resize = 1;
 102                                 a->redraw = 1;
 103                         }
 104                 }
 105         }
 106 }
 107
 108
 109 void size_by_layout (Area *a, int pos, int level)
 110 {
 111         // don't resize hiden objects
 112         if (!a->on_screen) return;
 113
 114         // parent node is resized before its children
 115         // calculate area's size
 116         GSList *l;
 117         if (a->resize && a->size_mode == SIZE_BY_LAYOUT) {
 118                 a->resize = 0;
 119
 120                 if (a->_resize) {
 121                         if (a->_resize(a)) {
 122                                 // if 'size' changed then 'resize = 1' on childs with SIZE_BY_LAYOUT
 123                                 for (l = a->list; l ; l = l->next) {
 124                                         if (((Area*)l->data)->size_mode == SIZE_BY_LAYOUT)
 125                                                 ((Area*)l->data)->resize = 1;
 126                                 }
 127                         }
 128                 }
 129         }
 130
 131         // update position of childs
 132         pos += a->paddingxlr + a->bg->border.width;
 133         int i=0;
 134         for (l = a->list; l ; l = l->next) {
 135                 Area *child = ((Area*)l->data);
 136                 if (!child->on_screen) continue;
 137                 i++;
 138
 139                 if (panel_horizontal) {
 140                         if (pos != child->posx) {
 141                                 // pos changed => redraw
 142                                 child->posx = pos;
 143                                 child->redraw = 1;
 144                         }
 145                 }
 146                 else {
 147                         if (pos != child->posy) {
 148                                 // pos changed => redraw
 149                                 child->posy = pos;
 150                                 child->redraw = 1;
 151                         }
 152                 }
 153                 //printf("level %d, object %d, pos %d\n", level, i, pos);
 154
 155                 size_by_layout(child, pos, level+1);
 156
 157                 if (panel_horizontal)
 158                         pos += child->width + a->paddingx;
 159                 else
 160                         pos += child->height + a->paddingx;
 161         }
 162 }
 163
 164
 165 void refresh (Area *a)
 166 {
 167         // don't draw and resize hide objects
 168         if (!a->on_screen) return;
 169
 170         // don't draw transparent objects (without foreground and without background)
 171         if (a->redraw) {
 172                 a->redraw = 0;
 173                 // force redraw of child
 174                 GSList *l;
 175                 for (l = a->list ; l ; l = l->next)
 176                         ((Area*)l->data)->redraw = 1;
 177 //                      set_redraw(l->data);
 178
 179                 //printf("draw area posx %d, width %d\n", a->posx, a->width);
 180                 draw(a);
 181         }
 182
 183         // draw current Area
 184         if (a->pix == 0) printf("empty area posx %d, width %d\n", a->posx, a->width);
 185         XCopyArea (server.dsp, a->pix, ((Panel *)a->panel)->temp_pmap, server.gc, 0, 0, a->width, a->height, a->posx, a->posy);
 186
 187         // and then refresh child object
 188         GSList *l;
 189         for (l = a->list; l ; l = l->next)
 190                 refresh(l->data);
 191 }
 192
 193
 194 void set_redraw (Area *a)
 195 {
 196         a->redraw = 1;
 197
 198         GSList *l;
 199         for (l = a->list ; l ; l = l->next)
 200                 set_redraw(l->data);
 201 }
 202
 203
 204 void draw (Area *a)
 205 {
 206         if (a->pix) XFreePixmap (server.dsp, a->pix);
 207         a->pix = XCreatePixmap (server.dsp, server.root_win, a->width, a->height, server.depth);
 208
 209         // add layer of root pixmap (or clear pixmap if real_transparency==true)
 210         if (server.real_transparency)
 211                 clear_pixmap(a->pix, 0 ,0, a->width, a->height);
 212         XCopyArea (server.dsp, ((Panel *)a->panel)->temp_pmap, a->pix, server.gc, a->posx, a->posy, a->width, a->height, 0, 0);
 213
 214         cairo_surface_t *cs;
 215         cairo_t *c;
 216
 217         cs = cairo_xlib_surface_create (server.dsp, a->pix, server.visual, a->width, a->height);
 218         c = cairo_create (cs);
 219
 220         draw_background (a, c);
 221
 222         if (a->_draw_foreground)
 223                 a->_draw_foreground(a, c);
 224
 225         cairo_destroy (c);
 226         cairo_surface_destroy (cs);
 227 }
 228
 229
 230 void draw_background (Area *a, cairo_t *c)
 231 {
 232         if (a->bg->back.alpha > 0.0) {
 233                 //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);
 234                 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);
 235                 cairo_set_source_rgba(c, a->bg->back.color[0], a->bg->back.color[1], a->bg->back.color[2], a->bg->back.alpha);
 236                 cairo_fill(c);
 237         }
 238
 239         if (a->bg->border.width > 0 && a->bg->border.alpha > 0.0) {
 240                 cairo_set_line_width (c, a->bg->border.width);
 241
 242                 // draw border inside (x, y, width, height)
 243                 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);
 244                 /*
 245                 // convert : radian = degre * M_PI/180
 246                 // definir le degrade dans un carre de (0,0) (100,100)
 247                 // ensuite ce degrade est extrapoler selon le ratio width/height
 248                 // dans repere (0, 0) (100, 100)
 249                 double X0, Y0, X1, Y1, degre;
 250                 // x = X * (a->width / 100), y = Y * (a->height / 100)
 251                 double x0, y0, x1, y1;
 252                 X0 = 0;
 253                 Y0 = 100;
 254                 X1 = 100;
 255                 Y1 = 0;
 256                 degre = 45;
 257                 // et ensuite faire la changement d'unite du repere
 258                 // car ce qui doit reste inchangee est les traits et pas la direction
 259
 260                 // il faut d'abord appliquer une rotation de 90 (et -180 si l'angle est superieur a  180)
 261                 // ceci peut etre applique une fois pour toute au depart
 262                 // ensuite calculer l'angle dans le nouveau repare
 263                 // puis faire une rotation de 90
 264                 x0 = X0 * ((double)a->width / 100);
 265                 x1 = X1 * ((double)a->width / 100);
 266                 y0 = Y0 * ((double)a->height / 100);
 267                 y1 = Y1 * ((double)a->height / 100);
 268
 269                 x0 = X0 * ((double)a->height / 100);
 270                 x1 = X1 * ((double)a->height / 100);
 271                 y0 = Y0 * ((double)a->width / 100);
 272                 y1 = Y1 * ((double)a->width / 100);
 273
 274                 cairo_pattern_t *linpat;
 275                 linpat = cairo_pattern_create_linear (x0, y0, x1, y1);
 276                 cairo_pattern_add_color_stop_rgba (linpat, 0, a->border.color[0], a->border.color[1], a->border.color[2], a->border.alpha);
 277                 cairo_pattern_add_color_stop_rgba (linpat, 1, a->border.color[0], a->border.color[1], a->border.color[2], 0);
 278                 cairo_set_source (c, linpat);
 279                 */
 280                 cairo_set_source_rgba (c, a->bg->border.color[0], a->bg->border.color[1], a->bg->border.color[2], a->bg->border.alpha);
 281
 282                 cairo_stroke (c);
 283                 //cairo_pattern_destroy (linpat);
 284         }
 285 }
 286
 287
 288 void remove_area (Area *a)
 289 {
 290         Area *parent = (Area*)a->parent;
 291
 292         parent->list = g_slist_remove(parent->list, a);
 293         set_redraw (parent);
 294
 295 }
 296
 297
 298 void add_area (Area *a)
 299 {
 300         Area *parent = (Area*)a->parent;
 301
 302         parent->list = g_slist_remove(parent->list, a);
 303         set_redraw (parent);
 304
 305 }
 306
 307
 308 void free_area (Area *a)
 309 {
 310         GSList *l0;
 311         for (l0 = a->list; l0 ; l0 = l0->next)
 312                 free_area (l0->data);
 313
 314         if (a->list) {
 315                 g_slist_free(a->list);
 316                 a->list = 0;
 317         }
 318         if (a->pix) {
 319                 XFreePixmap (server.dsp, a->pix);
 320                 a->pix = 0;
 321         }
 322 }
 323
 324
 325 void draw_rect(cairo_t *c, double x, double y, double w, double h, double r)
 326 {
 327         if (r > 0.0) {
 328                 double c1 = 0.55228475 * r;
 329
 330                 cairo_move_to(c, x+r, y);
 331                 cairo_rel_line_to(c, w-2*r, 0);
 332                 cairo_rel_curve_to(c, c1, 0.0, r, c1, r, r);
 333                 cairo_rel_line_to(c, 0, h-2*r);
 334                 cairo_rel_curve_to(c, 0.0, c1, c1-r, r, -r, r);
 335                 cairo_rel_line_to (c, -w +2*r, 0);
 336                 cairo_rel_curve_to (c, -c1, 0, -r, -c1, -r, -r);
 337                 cairo_rel_line_to (c, 0, -h + 2 * r);
 338                 cairo_rel_curve_to (c, 0, -c1, r - c1, -r, r, -r);
 339         }
 340         else
 341                 cairo_rectangle(c, x, y, w, h);
 342 }
 343
 344
 345 void clear_pixmap(Pixmap p, int x, int y, int w, int h)
 346 {
 347         Picture pict = XRenderCreatePicture(server.dsp, p, XRenderFindVisualFormat(server.dsp, server.visual), 0, 0);
 348         XRenderColor col = { .red=0, .green=0, .blue=0, .alpha=0 };
 349         XRenderFillRectangle(server.dsp, PictOpSrc, pict, &col, x, y, w, h);
 350         XRenderFreePicture(server.dsp, pict);
 351 }