src/motif_ui.c

   1 /*
   2  * X11 GUI for slide puzzle game
   3  * Copyright © 2022 Nick Bowler
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <config.h>
  20 #include <inttypes.h>
  21 #include <assert.h>
  22 #include <Xm/XmAll.h>
  23
  24 #include "motif.h"
  25 #include "motifstr.h"
  26 #include "motifgui.h"
  27
  28 #define SPLIT_NUMERATOR    75
  29 #define SPLIT_DENOMINATOR 100
  30
  31 #define MIN(a, b) ((a) < (b) ? (a) : (b))
  32
  33 /* XXX generate this list? */
  34 enum {
  35         widgetMainWindow,
  36         widgetForm,
  37         widgetFrame,
  38         widgetDrawingArea,
  39         widgetCascadeButton,
  40         widgetPushButton,
  41         widgetMax,
  42
  43         /* Pseudo-widgets */
  44         widgetMenuBar = widgetMax
  45 };
  46
  47 static WidgetClass * const widgets[widgetMax] = {
  48         &xmMainWindowWidgetClass,
  49         &xmFormWidgetClass,
  50         &xmFrameWidgetClass,
  51         &xmDrawingAreaWidgetClass,
  52         &xmCascadeButtonWidgetClass,
  53         &xmPushButtonWidgetClass
  54 };
  55
  56 static const struct ui_widget {
  57         uint_least16_t name;
  58         uint_least8_t subtree;
  59         uint_least8_t widget_type;
  60 } mainwin[] = { MAINWIN_INITIALIZER };
  61
  62 static const struct ui_menuitem {
  63         struct ui_widget w;
  64         uint_least16_t label;
  65 } mainmenu[] = { MAINMENU_INITIALIZER };
  66
  67 static void
  68 ResizeGameArea(Widget form, XEvent *e, String *args, Cardinal *num_args)
  69 {
  70         Widget game = XtNameToWidget(form, &tree_strtab[gameArea]);
  71         Widget goal = XtNameToWidget(form, &tree_strtab[goalArea]);
  72         Dimension w, h, gamesz, gameborder, goalsz, goalborder;
  73         int x, y, gap;
  74
  75         XtVaGetValues(form, XmNwidth, &w, XmNheight, &h, (char *)NULL);
  76         XtVaGetValues(game, XmNshadowThickness, &gameborder, (char *)NULL);
  77         XtVaGetValues(goal, XmNshadowThickness, &goalborder,
  78                             XmNleftOffset, &gap,
  79                             (char *)NULL);
  80
  81         gamesz = MIN(h, w * SPLIT_NUMERATOR / SPLIT_DENOMINATOR);
  82         gamesz = 5*( (gamesz - 2*gameborder)/5 ) + 2*gameborder;
  83
  84         goalsz = MIN(gamesz*3/5, w - gamesz - gap);
  85         goalsz = 3*( (goalsz - 2*goalborder)/3 ) + 2*goalborder;
  86
  87         x = (w - gamesz - goalsz - gap) / 2;
  88         if (x < 2) x = 0;
  89
  90         y = (h - gamesz) / 2;
  91         if (y < 3) y = 0;
  92
  93         XtVaSetValues(game, XmNleftOffset, x, XmNtopOffset, y, (char *)NULL);
  94         XtVaSetValues(game, XmNwidth, gamesz, XmNheight, gamesz, (char *)NULL);
  95         XtVaSetValues(goal, XmNwidth, goalsz, XmNheight, goalsz, (char *)NULL);
  96 }
  97
  98 static void game_configure(Widget form)
  99 {
 100         Widget gamearea = XtNameToWidget(form, &tree_strtab[gameArea]);
 101         Widget goalarea = XtNameToWidget(form, &tree_strtab[goalArea]);
 102         XtActionsRec resize_rec;
 103
 104         assert(gamearea && goalarea);
 105         XtVaSetValues(form, XmNfractionBase, SPLIT_DENOMINATOR, (char *)NULL);
 106
 107         XtVaSetValues(gamearea, XmNleftAttachment, XmATTACH_FORM,
 108                                 XmNtopAttachment, XmATTACH_FORM,
 109                                 (char *)NULL);
 110
 111         XtVaSetValues(goalarea, XmNleftAttachment, XmATTACH_WIDGET,
 112                                 XmNleftWidget, gamearea,
 113                                 XmNtopAttachment, XmATTACH_OPPOSITE_WIDGET,
 114                                 XmNtopWidget, gamearea,
 115                                 (char *)NULL);
 116
 117         resize_rec.string = "ResizeGameArea";
 118         resize_rec.proc = ResizeGameArea;
 119         XtAppAddActions(XtWidgetToApplicationContext(form), &resize_rec, 1);
 120         XtOverrideTranslations(form, XtParseTranslationTable(
 121                 "<Configure>: ResizeGameArea()\n"
 122                 "<Map>: ResizeGameArea()\n"
 123         ));
 124 }
 125
 126 static Widget create_widget(const struct ui_widget *item, Widget parent,
 127                             ArgList args, Cardinal num_args)
 128 {
 129         String name = (void *)&tree_strtab[item->name];
 130         WidgetClass class;
 131
 132         if (item->widget_type == widgetMenuBar)
 133                 return XmCreateMenuBar(parent, name, args, num_args);
 134
 135         assert(item->widget_type < widgetMax);
 136         class = *widgets[item->widget_type];
 137         return XtCreateWidget(name, class, parent, args, num_args);
 138 }
 139
 140 static void
 141 construct_widgets(const struct ui_widget *root, Widget parent, unsigned i)
 142 {
 143         const struct ui_widget *item;
 144
 145         for (item = &root[i]; item->name; item++) {
 146                 Widget w = create_widget(item, parent, NULL, 0);
 147
 148                 if (item->subtree)
 149                         construct_widgets(root, w, item->subtree);
 150
 151                 XtManageChild(w);
 152         }
 153 }
 154
 155 static void menu_cb(Widget w, void *data, void *cb_data)
 156 {
 157         XmRowColumnCallbackStruct *cbs = cb_data;
 158         XtCallActionProc(cbs->widget, XtName(cbs->widget), cbs->event, NULL, 0);
 159 }
 160
 161 static Widget create_pulldown(Widget parent)
 162 {
 163         Widget w;
 164
 165         w = XmCreatePulldownMenu(parent, XtName(parent), NULL, 0);
 166         XtVaSetValues(parent, XmNsubMenuId, w, (char *)NULL);
 167         XtAddCallback(w, XmNentryCallback, menu_cb, NULL);
 168
 169         return w;
 170 }
 171
 172 static void
 173 construct_menu(const struct ui_menuitem *root, Widget parent, unsigned i)
 174 {
 175         const struct ui_menuitem *item;
 176
 177         for (item = &root[i]; item->w.name; item++) {
 178                 const char *label = &strtab[item->label];
 179                 unsigned n = 0;
 180                 Arg args[2];
 181                 XmString s;
 182                 Widget w;
 183
 184                 if (XtClass(parent) == *widgets[widgetCascadeButton])
 185                         parent = create_pulldown(parent);
 186
 187                 if (label[0] && label[1] == '|') {
 188                         XtSetArg(args[n], XmNmnemonic, label[0]); n++;
 189                         label += 2;
 190                 }
 191
 192                 s = XmStringCreateLocalized((void *)label);
 193                 XtSetArg(args[n], XmNlabelString, s); n++;
 194
 195                 w = create_widget(&item->w, parent, args, n);
 196
 197                 XmStringFree(s);
 198
 199                 if (item->w.subtree)
 200                         construct_menu(root, w, item->w.subtree);
 201
 202                 XtManageChild(w);
 203         }
 204 }
 205
 206 static void game_resize(Widget w, void *data, void *cb_data)
 207 {
 208         if (XtIsRealized(w))
 209                 x11_redraw_game(data, -1);
 210 }
 211
 212 static void goal_resize(Widget w, void *data, void *cb_data)
 213 {
 214         if (XtIsRealized(w))
 215                 x11_redraw_goal(data, -1);
 216 }
 217
 218 static void do_input_move(struct app_state *state, int x, int y)
 219 {
 220         uint_least32_t *gp = state->board.game, prev[4];
 221
 222         memcpy(prev, gp, sizeof prev);
 223         if (game_do_move(&state->board, x, y) == 0) {
 224                 uint_least32_t mask;
 225
 226                 if (game_check_goal(&state->board)) {
 227                         printf("You win!\n");
 228                         game_finish(&state->board);
 229                 }
 230
 231                 /* Figure out which tiles changed */
 232                 prev[0] ^= gp[0];
 233                 prev[1] ^= gp[1];
 234                 prev[2] ^= gp[2];
 235                 mask = prev[0] | prev[1] | prev[2];
 236
 237                 x11_redraw_game(state, mask);
 238         }
 239 }
 240
 241 static void game_input(Widget w, void *data, void *cb_data)
 242 {
 243         XmDrawingAreaCallbackStruct *cbs = cb_data;
 244         XButtonEvent *click = &cbs->event->xbutton;
 245         struct app_state *state = data;
 246         Dimension width, height;
 247         unsigned x = -1, y = -1;
 248
 249         switch (cbs->event->type) {
 250         case ButtonPress:
 251                 XtVaGetValues(w, XmNwidth, &width,
 252                                  XmNheight, &height,
 253                                  (char *)NULL);
 254                 x = click->x / (width/5);
 255                 y = click->y / (height/5);
 256         }
 257
 258         if (x > 4 || y > 4)
 259                 return;
 260
 261         do_input_move(state, x, y);
 262 }
 263
 264 /* Figure out which tiles intersect a rectangle. */
 265 static uint_fast32_t
 266 expose_mask(int rect_x, int rect_y, int rect_w, int rect_h,
 267                                     int tile_w, int tile_h)
 268 {
 269         return board_right(rect_x / tile_w)
 270              & board_below(rect_y / tile_h)
 271              & board_above((rect_y + rect_h - 1) / tile_h)
 272              & board_left((rect_x + rect_w - 1) / tile_w);
 273 }
 274
 275 static void game_expose(Widget w, void *data, void *cb_data)
 276 {
 277         XmDrawingAreaCallbackStruct *cbs = cb_data;
 278         XExposeEvent *e = &cbs->event->xexpose;
 279         Dimension width, height;
 280         uint_fast32_t mask;
 281
 282         XtVaGetValues(w, XmNwidth, &width, XmNheight, &height, (char *)NULL);
 283         if (!(width /= 5) || !(height /= 5))
 284                 return;
 285
 286         mask = expose_mask(e->x, e->y, e->width, e->height, width, height);
 287         x11_redraw_game(data, mask);
 288 }
 289
 290 static void goal_expose(Widget w, void *data, void *cb_data)
 291 {
 292         XmDrawingAreaCallbackStruct *cbs = cb_data;
 293         XExposeEvent *e = &cbs->event->xexpose;
 294         Dimension width, height;
 295         uint_fast32_t mask;
 296
 297         XtVaGetValues(w, XmNwidth, &width, XmNheight, &height, (char *)NULL);
 298         if (!(width /= 3) || !(height /= 3))
 299                 return;
 300
 301         mask = expose_mask(e->x, e->y, e->width, e->height, width, height);
 302         x11_redraw_goal(data, mask);
 303 }
 304
 305 void ui_initialize(struct app_state *state, Widget shell)
 306 {
 307         Widget menubar, help;
 308
 309         construct_widgets(mainwin, shell, 0);
 310
 311         menubar = XtNameToWidget(shell, "*menuBar");
 312         construct_menu(mainmenu, menubar, 0);
 313
 314         help = XtNameToWidget(menubar, "helpMenu");
 315         XtVaSetValues(menubar, XmNmenuHelpWidget, help, (char *)NULL);
 316
 317         game_configure(XtNameToWidget(shell, "*game"));
 318
 319         state->game = XtNameToWidget(shell, "*gameCanvas");
 320         XtAddCallback(state->game, XmNresizeCallback, game_resize, state);
 321         XtAddCallback(state->game, XmNexposeCallback, game_expose, state);
 322         XtAddCallback(state->game, XmNinputCallback,  game_input,  state);
 323
 324         state->goal = XtNameToWidget(shell, "*goalCanvas");
 325         XtAddCallback(state->goal, XmNresizeCallback, goal_resize, state);
 326         XtAddCallback(state->goal, XmNexposeCallback, goal_expose, state);
 327 }