WINGs/wslider.c

   1
   2 #include "WINGsP.h"
   3
   4 #undef STRICT_NEXT_BEHAVIOUR
   5
   6 typedef struct W_Slider {
   7         W_Class widgetClass;
   8         WMView *view;
   9
  10         int minValue;
  11         int maxValue;
  12
  13         int value;
  14
  15         Pixmap knobPixmap;
  16         WMPixmap *backPixmap;
  17
  18         WMAction *action;
  19         void *clientData;
  20
  21         int knobThickness;
  22
  23         struct {
  24                 unsigned int continuous:1;
  25
  26                 unsigned int vertical:1;
  27                 unsigned int dragging:1;
  28         } flags;
  29
  30 } Slider;
  31
  32 static void didResizeSlider();
  33
  34 W_ViewDelegate _SliderViewDelegate = {
  35         NULL,
  36         NULL,
  37         didResizeSlider,
  38         NULL,
  39         NULL
  40 };
  41
  42 static void destroySlider(Slider * sPtr);
  43 static void paintSlider(Slider * sPtr);
  44
  45 static void handleEvents(XEvent * event, void *data);
  46 static void handleActionEvents(XEvent * event, void *data);
  47
  48 static void makeKnobPixmap(Slider * sPtr);
  49
  50 static void realizeObserver(void *self, WMNotification * not)
  51 {
  52         makeKnobPixmap(self);
  53 }
  54
  55 WMSlider *WMCreateSlider(WMWidget * parent)
  56 {
  57         Slider *sPtr;
  58
  59         sPtr = wmalloc(sizeof(Slider));
  60         memset(sPtr, 0, sizeof(Slider));
  61
  62         sPtr->widgetClass = WC_Slider;
  63
  64         sPtr->view = W_CreateView(W_VIEW(parent));
  65         if (!sPtr->view) {
  66                 wfree(sPtr);
  67                 return NULL;
  68         }
  69         sPtr->view->self = sPtr;
  70
  71         sPtr->view->delegate = &_SliderViewDelegate;
  72
  73         WMCreateEventHandler(sPtr->view, ExposureMask | StructureNotifyMask, handleEvents, sPtr);
  74
  75         WMCreateEventHandler(sPtr->view, ButtonPressMask | ButtonReleaseMask
  76                              | EnterWindowMask | LeaveWindowMask | ButtonMotionMask, handleActionEvents, sPtr);
  77
  78         W_ResizeView(sPtr->view, 100, 16);
  79         sPtr->flags.vertical = 0;
  80         sPtr->minValue = 0;
  81         sPtr->maxValue = 100;
  82         sPtr->value = 50;
  83
  84         sPtr->knobThickness = 20;
  85
  86         sPtr->flags.continuous = 1;
  87
  88         WMAddNotificationObserver(realizeObserver, sPtr, WMViewRealizedNotification, sPtr->view);
  89
  90         return sPtr;
  91 }
  92
  93 void WMSetSliderImage(WMSlider * sPtr, WMPixmap * pixmap)
  94 {
  95         if (sPtr->backPixmap)
  96                 WMReleasePixmap(sPtr->backPixmap);
  97
  98         sPtr->backPixmap = WMRetainPixmap(pixmap);
  99
 100         if (sPtr->view->flags.mapped) {
 101                 paintSlider(sPtr);
 102         }
 103 }
 104
 105 void WMSetSliderKnobThickness(WMSlider * sPtr, int thickness)
 106 {
 107         assert(thickness > 0);
 108
 109         sPtr->knobThickness = thickness;
 110
 111         if (sPtr->knobPixmap) {
 112                 makeKnobPixmap(sPtr);
 113         }
 114
 115         if (sPtr->view->flags.mapped) {
 116                 paintSlider(sPtr);
 117         }
 118 }
 119
 120 int WMGetSliderMinValue(WMSlider * slider)
 121 {
 122         CHECK_CLASS(slider, WC_Slider);
 123
 124         return slider->minValue;
 125 }
 126
 127 int WMGetSliderMaxValue(WMSlider * slider)
 128 {
 129         CHECK_CLASS(slider, WC_Slider);
 130
 131         return slider->maxValue;
 132 }
 133
 134 int WMGetSliderValue(WMSlider * slider)
 135 {
 136         CHECK_CLASS(slider, WC_Slider);
 137
 138         return slider->value;
 139 }
 140
 141 void WMSetSliderMinValue(WMSlider * slider, int value)
 142 {
 143         CHECK_CLASS(slider, WC_Slider);
 144
 145         slider->minValue = value;
 146         if (slider->value < value) {
 147                 slider->value = value;
 148                 if (slider->view->flags.mapped)
 149                         paintSlider(slider);
 150         }
 151 }
 152
 153 void WMSetSliderMaxValue(WMSlider * slider, int value)
 154 {
 155         CHECK_CLASS(slider, WC_Slider);
 156
 157         slider->maxValue = value;
 158         if (slider->value > value) {
 159                 slider->value = value;
 160                 if (slider->view->flags.mapped)
 161                         paintSlider(slider);
 162         }
 163 }
 164
 165 void WMSetSliderValue(WMSlider * slider, int value)
 166 {
 167         CHECK_CLASS(slider, WC_Slider);
 168
 169         if (value < slider->minValue)
 170                 slider->value = slider->minValue;
 171         else if (value > slider->maxValue)
 172                 slider->value = slider->maxValue;
 173         else
 174                 slider->value = value;
 175
 176         if (slider->view->flags.mapped)
 177                 paintSlider(slider);
 178 }
 179
 180 void WMSetSliderContinuous(WMSlider * slider, Bool flag)
 181 {
 182         CHECK_CLASS(slider, WC_Slider);
 183
 184         slider->flags.continuous = ((flag == 0) ? 0 : 1);
 185 }
 186
 187 void WMSetSliderAction(WMSlider * slider, WMAction * action, void *data)
 188 {
 189         CHECK_CLASS(slider, WC_Slider);
 190
 191         slider->action = action;
 192         slider->clientData = data;
 193 }
 194
 195 static void makeKnobPixmap(Slider * sPtr)
 196 {
 197         Pixmap pix;
 198         WMScreen *scr = sPtr->view->screen;
 199         int w, h;
 200
 201         if (sPtr->flags.vertical) {
 202                 w = sPtr->view->size.width - 2;
 203                 h = sPtr->knobThickness;
 204         } else {
 205                 w = sPtr->knobThickness;
 206                 h = sPtr->view->size.height - 2;
 207         }
 208
 209         pix = XCreatePixmap(scr->display, sPtr->view->window, w, h, scr->depth);
 210         XFillRectangle(scr->display, pix, WMColorGC(scr->gray), 0, 0, w, h);
 211
 212         if (sPtr->knobThickness < 10) {
 213                 W_DrawRelief(scr, pix, 0, 0, w, h, WRRaised);
 214         } else if (sPtr->flags.vertical) {
 215                 XDrawLine(scr->display, pix, WMColorGC(scr->white), 0, 0, 0, h - 3);
 216                 XDrawLine(scr->display, pix, WMColorGC(scr->white), 1, 0, 1, h - 3);
 217                 XDrawLine(scr->display, pix, WMColorGC(scr->darkGray), w - 2, 1, w - 2, h / 2 - 2);
 218                 XDrawLine(scr->display, pix, WMColorGC(scr->darkGray), w - 2, h / 2, w - 2, h - 2);
 219
 220                 XDrawLine(scr->display, pix, WMColorGC(scr->white), 0, 0, w - 2, 0);
 221                 XDrawLine(scr->display, pix, WMColorGC(scr->darkGray), 1, h / 2 - 2, w - 3, h / 2 - 2);
 222                 XDrawLine(scr->display, pix, WMColorGC(scr->white), 0, h / 2 - 1, w - 3, h / 2 - 1);
 223
 224                 XDrawLine(scr->display, pix, WMColorGC(scr->black), w - 1, 0, w - 1, h - 2);
 225
 226                 XDrawLine(scr->display, pix, WMColorGC(scr->darkGray), 0, h - 3, w - 2, h - 3);
 227                 XDrawLine(scr->display, pix, WMColorGC(scr->black), 0, h - 2, w - 1, h - 2);
 228                 XDrawLine(scr->display, pix, WMColorGC(scr->darkGray), 0, h - 1, w - 1, h - 1);
 229         } else {
 230                 XDrawLine(scr->display, pix, WMColorGC(scr->white), 0, 0, w - 3, 0);
 231
 232                 XDrawLine(scr->display, pix, WMColorGC(scr->white), 0, 0, 0, h - 2);
 233
 234                 XDrawLine(scr->display, pix, WMColorGC(scr->white), 1, 0, 1, h - 3);
 235                 XDrawLine(scr->display, pix, WMColorGC(scr->darkGray), w / 2 - 2, 1, w / 2 - 2, h - 3);
 236                 XDrawLine(scr->display, pix, WMColorGC(scr->white), w / 2 - 1, 0, w / 2 - 1, h - 3);
 237
 238                 XDrawLine(scr->display, pix, WMColorGC(scr->darkGray), w - 3, 0, w - 3, h - 2);
 239                 XDrawLine(scr->display, pix, WMColorGC(scr->black), w - 2, 0, w - 2, h - 2);
 240                 XDrawLine(scr->display, pix, WMColorGC(scr->darkGray), w - 1, 0, w - 1, h - 1);
 241
 242                 XDrawLine(scr->display, pix, WMColorGC(scr->black), 1, h - 1, w / 2 + 1, h - 1);
 243                 XDrawLine(scr->display, pix, WMColorGC(scr->darkGray), 1, h - 2, w / 2 - 2, h - 2);
 244                 XDrawLine(scr->display, pix, WMColorGC(scr->darkGray), w / 2, h - 2, w - 3, h - 2);
 245
 246                 XDrawLine(scr->display, pix, WMColorGC(scr->black), 0, h - 1, w - 2, h - 1);
 247         }
 248
 249         if (sPtr->knobPixmap)
 250                 XFreePixmap(scr->display, sPtr->knobPixmap);
 251         sPtr->knobPixmap = pix;
 252 }
 253
 254 static void didResizeSlider(W_ViewDelegate * self, WMView * view)
 255 {
 256         Slider *sPtr = (Slider *) view->self;
 257         int width = sPtr->view->size.width;
 258         int height = sPtr->view->size.height;
 259
 260         assert(width > 0);
 261         assert(height > 0);
 262
 263         if (width > height) {
 264                 if (sPtr->flags.vertical) {
 265                         sPtr->flags.vertical = 0;
 266                         if (sPtr->view->flags.realized)
 267                                 makeKnobPixmap(sPtr);
 268                 }
 269         } else {
 270                 if (!sPtr->flags.vertical) {
 271                         sPtr->flags.vertical = 1;
 272                         if (sPtr->view->flags.realized)
 273                                 makeKnobPixmap(sPtr);
 274                 }
 275         }
 276 }
 277
 278 static void paintSlider(Slider * sPtr)
 279 {
 280         W_Screen *scr = sPtr->view->screen;
 281         GC bgc;
 282         GC wgc;
 283         GC lgc;
 284         WMSize size = sPtr->view->size;
 285         int pos;
 286         Pixmap buffer;
 287
 288 #define MINV sPtr->minValue
 289 #define MAXV sPtr->maxValue
 290 #define POSV sPtr->value
 291
 292         bgc = WMColorGC(scr->black);
 293         wgc = WMColorGC(scr->white);
 294         lgc = WMColorGC(scr->gray);
 295
 296         buffer = XCreatePixmap(scr->display, sPtr->view->window, size.width, size.height, scr->depth);
 297
 298         if (sPtr->backPixmap) {
 299                 WMSize size = WMGetPixmapSize(sPtr->backPixmap);
 300
 301                 XCopyArea(scr->display, WMGetPixmapXID(sPtr->backPixmap),
 302                           buffer, scr->copyGC, 0, 0, size.width, size.height, 1, 1);
 303         } else {
 304                 XFillRectangle(scr->display, buffer, lgc, 0, 0, size.width, size.height);
 305                 XFillRectangle(scr->display, buffer, scr->stippleGC, 0, 0, size.width, size.height);
 306         }
 307
 308         if (sPtr->flags.vertical) {
 309                 pos = (size.height - 2 - sPtr->knobThickness) * (POSV - MINV) / (MAXV - MINV) + 1;
 310                 /* draw knob */
 311                 XCopyArea(scr->display, sPtr->knobPixmap, buffer,
 312                           scr->copyGC, 0, 0, size.width - 2, sPtr->knobThickness, 1, pos);
 313         } else {
 314                 pos = (size.width - 2 - sPtr->knobThickness) * (POSV - MINV) / (MAXV - MINV) + 1;
 315                 /* draw knob */
 316                 XCopyArea(scr->display, sPtr->knobPixmap, buffer,
 317                           scr->copyGC, 0, 0, sPtr->knobThickness, size.height, pos, 1);
 318         }
 319
 320         XDrawLine(scr->display, buffer, bgc, 0, 0, 0, size.height - 1);
 321         XDrawLine(scr->display, buffer, bgc, 0, 0, size.width, 0);
 322
 323         XDrawLine(scr->display, buffer, wgc, size.width - 1, 0, size.width - 1, size.height - 1);
 324         XDrawLine(scr->display, buffer, wgc, 0, size.height - 1, size.width - 1, size.height - 1);
 325
 326         XCopyArea(scr->display, buffer, sPtr->view->window, scr->copyGC, 0, 0, size.width, size.height, 0, 0);
 327         XFreePixmap(scr->display, buffer);
 328 }
 329
 330 static void handleEvents(XEvent * event, void *data)
 331 {
 332         Slider *sPtr = (Slider *) data;
 333
 334         CHECK_CLASS(data, WC_Slider);
 335
 336         switch (event->type) {
 337         case Expose:
 338                 if (event->xexpose.count != 0)
 339                         break;
 340                 paintSlider(sPtr);
 341                 break;
 342
 343         case DestroyNotify:
 344                 destroySlider(sPtr);
 345                 break;
 346
 347         }
 348 }
 349
 350 #define DECR_PART       1
 351 #define KNOB_PART       2
 352 #define INCR_PART       3
 353
 354 static int getSliderPart(Slider * sPtr, int x, int y)
 355 {
 356         int p;
 357         int pos;
 358         WMSize size = sPtr->view->size;
 359
 360         if (sPtr->flags.vertical) {
 361                 p = y;
 362                 pos = (size.height - 2 - sPtr->knobThickness) * (POSV - MINV) / (MAXV - MINV);
 363                 if (p < pos)
 364                         return INCR_PART;
 365                 if (p > pos + sPtr->knobThickness)
 366                         return DECR_PART;
 367                 return KNOB_PART;
 368         } else {
 369                 p = x;
 370                 pos = (size.width - 2 - sPtr->knobThickness) * (POSV - MINV) / (MAXV - MINV);
 371                 if (p < pos)
 372                         return DECR_PART;
 373                 if (p > pos + sPtr->knobThickness)
 374                         return INCR_PART;
 375                 return KNOB_PART;
 376         }
 377 }
 378
 379 static int valueForMousePoint(Slider * sPtr, int x, int y)
 380 {
 381         WMSize size = sPtr->view->size;
 382         int f;
 383
 384         if (sPtr->flags.vertical) {
 385                 f = (y - sPtr->knobThickness / 2) * (MAXV - MINV)
 386                     / ((int)size.height - 2 - sPtr->knobThickness);
 387         } else {
 388                 f = (x - sPtr->knobThickness / 2) * (MAXV - MINV)
 389                     / ((int)size.width - 2 - sPtr->knobThickness);
 390         }
 391
 392         f += sPtr->minValue;
 393         if (f < sPtr->minValue)
 394                 f = sPtr->minValue;
 395         else if (f > sPtr->maxValue)
 396                 f = sPtr->maxValue;
 397
 398         return f;
 399 }
 400
 401 static void handleActionEvents(XEvent * event, void *data)
 402 {
 403         WMSlider *sPtr = (Slider *) data;
 404
 405         CHECK_CLASS(data, WC_Slider);
 406
 407         switch (event->type) {
 408         case ButtonPress:
 409                 if (event->xbutton.button == WINGsConfiguration.mouseWheelUp && !sPtr->flags.dragging) {
 410                         /* Wheel up */
 411                         if (sPtr->value + 1 <= sPtr->maxValue) {
 412                                 WMSetSliderValue(sPtr, sPtr->value + 1);
 413                                 if (sPtr->flags.continuous && sPtr->action) {
 414                                         (*sPtr->action) (sPtr, sPtr->clientData);
 415                                 }
 416                         }
 417                 } else if (event->xbutton.button == WINGsConfiguration.mouseWheelDown && !sPtr->flags.dragging) {
 418                         /* Wheel down */
 419                         if (sPtr->value - 1 >= sPtr->minValue) {
 420                                 WMSetSliderValue(sPtr, sPtr->value - 1);
 421                                 if (sPtr->flags.continuous && sPtr->action) {
 422                                         (*sPtr->action) (sPtr, sPtr->clientData);
 423                                 }
 424                         }
 425                 } else if (getSliderPart(sPtr, event->xbutton.x, event->xbutton.y)
 426                            == KNOB_PART)
 427                         sPtr->flags.dragging = 1;
 428                 else {
 429 #ifdef STRICT_NEXT_BEHAVIOUR
 430                         sPtr->flags.dragging = 1;
 431
 432                         sPtr->value = valueForMousePoint(sPtr, event->xmotion.x, event->xmotion.y);
 433                         paintSlider(sPtr);
 434 #else
 435                         int tmp;
 436
 437                         if (event->xbutton.button == Button2) {
 438                                 sPtr->flags.dragging = 1;
 439
 440                                 sPtr->value = valueForMousePoint(sPtr, event->xmotion.x, event->xmotion.y);
 441                                 paintSlider(sPtr);
 442                         } else {
 443                                 tmp = valueForMousePoint(sPtr, event->xmotion.x, event->xmotion.y);
 444                                 if (tmp < sPtr->value)
 445                                         tmp = sPtr->value - 1;
 446                                 else
 447                                         tmp = sPtr->value + 1;
 448                                 WMSetSliderValue(sPtr, tmp);
 449                         }
 450 #endif
 451
 452                         if (sPtr->flags.continuous && sPtr->action) {
 453                                 (*sPtr->action) (sPtr, sPtr->clientData);
 454                         }
 455                 }
 456                 break;
 457
 458         case ButtonRelease:
 459                 if (!sPtr->flags.continuous && sPtr->action) {
 460                         (*sPtr->action) (sPtr, sPtr->clientData);
 461                 }
 462                 sPtr->flags.dragging = 0;
 463                 break;
 464
 465         case MotionNotify:
 466                 if (sPtr->flags.dragging) {
 467                         sPtr->value = valueForMousePoint(sPtr, event->xmotion.x, event->xmotion.y);
 468                         paintSlider(sPtr);
 469
 470                         if (sPtr->flags.continuous && sPtr->action) {
 471                                 (*sPtr->action) (sPtr, sPtr->clientData);
 472                         }
 473                 }
 474                 break;
 475         }
 476 }
 477
 478 static void destroySlider(Slider * sPtr)
 479 {
 480         if (sPtr->knobPixmap)
 481                 XFreePixmap(sPtr->view->screen->display, sPtr->knobPixmap);
 482
 483         if (sPtr->backPixmap)
 484                 WMReleasePixmap(sPtr->backPixmap);
 485
 486         WMRemoveNotificationObserver(sPtr);
 487
 488         wfree(sPtr);
 489 }