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  * AREA :
  38  * Areas in tint2 are similar to widgets in a GUI.
  39  * Graphical objects (panel, taskbar, task, systray, clock, ...) in tint2 'inherit' an Area class.
  40  * Area is an abstract class of objects. It's at the begining of each object (&object == &area).
  41  * Area manage the background and border drawing, size and padding.
  42  *
  43  * DATA ORGANISATION :
  44  * tint2 define one panel per monitor. And each panel have a tree of Area (nodes).
  45  * The root of the tree is Panel.Area. And task, clock, systray, taskbar,... are nodes.
  46  *
  47  * 'panel_items' parameter (in config) define the list and the order of nodes in tree's panel.
  48  * 'panel_items = SC' define a panel with just Systray and Clock.
  49  * So the root Panel.Area will have 2 childs (Systray and Clock).
  50  *
  51  * The tree allow to browse panel's objects from background to foreground and from left to right.
  52  * The position of each node/Area depend on parent's position and brothers on the left.
  53  *
  54  * DRAWING EVENT :
  55  * In the end, redrawing an object (like the clock) could come from an external event (date change)
  56  * or from a layering event (size or position change).
  57  *
  58  * DRAWING LOOP :
  59  *
  60  * 1) browse tree and resize SIZE_BY_CONTENT node
  61  *      - children node are resized before its parent
  62  *      - if 'size' changed then 'resize = 1' on the parent
  63  * 2) browse tree and resize SIZE_BY_LAYOUT node
  64  *      - parent node is resized before its children
  65  *      - if 'size' changed then 'resize = 1' on childs with SIZE_BY_LAYOUT
  66  * 3) calculate posx of objects
  67  *      - parent's position is calculated before children's position
  68  *      - if 'position' changed then 'redraw = 1'
  69  * 4) redraw needed objects
  70  *      - parent node is drawn before its children
  71  *
  72  * perhaps 2) and 3) can be merged...
  73  ************************************************************/
  74
  75
  76 void refresh (Area *a)
  77 {
  78         // don't draw and resize hide objects
  79         if (!a->on_screen) return;
  80
  81         // don't draw transparent objects (without foreground and without background)
  82         if (a->redraw) {
  83                 a->redraw = 0;
  84                 // force redraw of child
  85                 GSList *l;
  86                 for (l = a->list ; l ; l = l->next)
  87                         set_redraw(l->data);
  88
  89                 //printf("draw area posx %d, width %d\n", a->posx, a->width);
  90                 draw(a);
  91         }
  92
  93         // draw current Area
  94         if (a->pix == 0) printf("empty area posx %d, width %d\n", a->posx, a->width);
  95         XCopyArea (server.dsp, a->pix, ((Panel *)a->panel)->temp_pmap, server.gc, 0, 0, a->width, a->height, a->posx, a->posy);
  96
  97         // and then refresh child object
  98         GSList *l;
  99         for (l = a->list; l ; l = l->next)
 100                 refresh(l->data);
 101 }
 102
 103
 104 void size_by_content (Area *a)
 105 {
 106         // don't draw and resize hide objects
 107         if (!a->on_screen) return;
 108
 109         // children node are resized before its parent
 110         GSList *l;
 111         for (l = a->list; l ; l = l->next)
 112                 size_by_content(l->data);
 113
 114         // calculate current area's size
 115         if (a->resize && a->size_mode == SIZE_BY_CONTENT) {
 116                 a->resize = 0;
 117
 118                 // if 'size' changed then 'resize = 1' on the parent
 119                 if (a->_resize) {
 120                         a->_resize(a);
 121                         ((Area*)a->parent)->resize = 1;
 122                 }
 123         }
 124 }
 125
 126
 127 void size_by_layout (Area *a)
 128 {
 129         // don't draw and resize hide objects
 130         if (!a->on_screen) return;
 131
 132         // parent node is resized before its children
 133         // calculate current area's size
 134         GSList *l;
 135         if (a->resize && a->size_mode == SIZE_BY_LAYOUT) {
 136                 a->resize = 0;
 137
 138                 // if 'size' changed then 'resize = 1' on childs with SIZE_BY_LAYOUT
 139                 if (a->_resize) {
 140                         a->_resize(a);
 141                         for (l = a->list; l ; l = l->next) {
 142                                 if (((Area*)l->data)->size_mode == SIZE_BY_LAYOUT)
 143                                         ((Area*)l->data)->resize = 1;
 144                         }
 145                 }
 146         }
 147
 148         for (l = a->list; l ; l = l->next)
 149                 size_by_layout(l->data);
 150 }
 151
 152
 153 void set_redraw (Area *a)
 154 {
 155         a->redraw = 1;
 156
 157         GSList *l;
 158         for (l = a->list ; l ; l = l->next)
 159                 set_redraw(l->data);
 160 }
 161
 162
 163 void draw (Area *a)
 164 {
 165         if (a->pix) XFreePixmap (server.dsp, a->pix);
 166         a->pix = XCreatePixmap (server.dsp, server.root_win, a->width, a->height, server.depth);
 167
 168         // add layer of root pixmap (or clear pixmap if real_transparency==true)
 169         if (server.real_transparency)
 170                 clear_pixmap(a->pix, 0 ,0, a->width, a->height);
 171         XCopyArea (server.dsp, ((Panel *)a->panel)->temp_pmap, a->pix, server.gc, a->posx, a->posy, a->width, a->height, 0, 0);
 172
 173         cairo_surface_t *cs;
 174         cairo_t *c;
 175
 176         cs = cairo_xlib_surface_create (server.dsp, a->pix, server.visual, a->width, a->height);
 177         c = cairo_create (cs);
 178
 179         draw_background (a, c);
 180
 181         if (a->_draw_foreground)
 182                 a->_draw_foreground(a, c);
 183
 184         cairo_destroy (c);
 185         cairo_surface_destroy (cs);
 186 }
 187
 188
 189 void draw_background (Area *a, cairo_t *c)
 190 {
 191         if (a->bg->back.alpha > 0.0) {
 192                 //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);
 193                 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);
 194                 cairo_set_source_rgba(c, a->bg->back.color[0], a->bg->back.color[1], a->bg->back.color[2], a->bg->back.alpha);
 195                 cairo_fill(c);
 196         }
 197
 198         if (a->bg->border.width > 0 && a->bg->border.alpha > 0.0) {
 199                 cairo_set_line_width (c, a->bg->border.width);
 200
 201                 // draw border inside (x, y, width, height)
 202                 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);
 203                 /*
 204                 // convert : radian = degre * M_PI/180
 205                 // definir le degrade dans un carre de (0,0) (100,100)
 206                 // ensuite ce degrade est extrapoler selon le ratio width/height
 207                 // dans repere (0, 0) (100, 100)
 208                 double X0, Y0, X1, Y1, degre;
 209                 // x = X * (a->width / 100), y = Y * (a->height / 100)
 210                 double x0, y0, x1, y1;
 211                 X0 = 0;
 212                 Y0 = 100;
 213                 X1 = 100;
 214                 Y1 = 0;
 215                 degre = 45;
 216                 // et ensuite faire la changement d'unite du repere
 217                 // car ce qui doit reste inchangee est les traits et pas la direction
 218
 219                 // il faut d'abord appliquer une rotation de 90 (et -180 si l'angle est superieur a  180)
 220                 // ceci peut etre applique une fois pour toute au depart
 221                 // ensuite calculer l'angle dans le nouveau repare
 222                 // puis faire une rotation de 90
 223                 x0 = X0 * ((double)a->width / 100);
 224                 x1 = X1 * ((double)a->width / 100);
 225                 y0 = Y0 * ((double)a->height / 100);
 226                 y1 = Y1 * ((double)a->height / 100);
 227
 228                 x0 = X0 * ((double)a->height / 100);
 229                 x1 = X1 * ((double)a->height / 100);
 230                 y0 = Y0 * ((double)a->width / 100);
 231                 y1 = Y1 * ((double)a->width / 100);
 232
 233                 cairo_pattern_t *linpat;
 234                 linpat = cairo_pattern_create_linear (x0, y0, x1, y1);
 235                 cairo_pattern_add_color_stop_rgba (linpat, 0, a->border.color[0], a->border.color[1], a->border.color[2], a->border.alpha);
 236                 cairo_pattern_add_color_stop_rgba (linpat, 1, a->border.color[0], a->border.color[1], a->border.color[2], 0);
 237                 cairo_set_source (c, linpat);
 238                 */
 239                 cairo_set_source_rgba (c, a->bg->border.color[0], a->bg->border.color[1], a->bg->border.color[2], a->bg->border.alpha);
 240
 241                 cairo_stroke (c);
 242                 //cairo_pattern_destroy (linpat);
 243         }
 244 }
 245
 246
 247 void remove_area (Area *a)
 248 {
 249         Area *parent = (Area*)a->parent;
 250
 251         parent->list = g_slist_remove(parent->list, a);
 252         set_redraw (parent);
 253
 254 }
 255
 256
 257 void add_area (Area *a)
 258 {
 259         Area *parent = (Area*)a->parent;
 260
 261         parent->list = g_slist_remove(parent->list, a);
 262         set_redraw (parent);
 263
 264 }
 265
 266
 267 void free_area (Area *a)
 268 {
 269         GSList *l0;
 270         for (l0 = a->list; l0 ; l0 = l0->next)
 271                 free_area (l0->data);
 272
 273         if (a->list) {
 274                 g_slist_free(a->list);
 275                 a->list = 0;
 276         }
 277         if (a->pix) {
 278                 XFreePixmap (server.dsp, a->pix);
 279                 a->pix = 0;
 280         }
 281 }
 282
 283
 284 void draw_rect(cairo_t *c, double x, double y, double w, double h, double r)
 285 {
 286         if (r > 0.0) {
 287                 double c1 = 0.55228475 * r;
 288
 289                 cairo_move_to(c, x+r, y);
 290                 cairo_rel_line_to(c, w-2*r, 0);
 291                 cairo_rel_curve_to(c, c1, 0.0, r, c1, r, r);
 292                 cairo_rel_line_to(c, 0, h-2*r);
 293                 cairo_rel_curve_to(c, 0.0, c1, c1-r, r, -r, r);
 294                 cairo_rel_line_to (c, -w +2*r, 0);
 295                 cairo_rel_curve_to (c, -c1, 0, -r, -c1, -r, -r);
 296                 cairo_rel_line_to (c, 0, -h + 2 * r);
 297                 cairo_rel_curve_to (c, 0, -c1, r - c1, -r, r, -r);
 298         }
 299         else
 300                 cairo_rectangle(c, x, y, w, h);
 301 }
 302
 303
 304 void clear_pixmap(Pixmap p, int x, int y, int w, int h)
 305 {
 306         Picture pict = XRenderCreatePicture(server.dsp, p, XRenderFindVisualFormat(server.dsp, server.visual), 0, 0);
 307         XRenderColor col = { .red=0, .green=0, .blue=0, .alpha=0 };
 308         XRenderFillRectangle(server.dsp, PictOpSrc, pict, &col, x, y, w, h);
 309         XRenderFreePicture(server.dsp, pict);
 310 }