1 /* 2 * Copyright 2001-2009, Haiku, Inc. 3 * Distributed under the terms of the MIT License. 4 * 5 * Authors: 6 * Marc Flerackers (mflerackers@androme.be) 7 * Stefano Ceccherini (stefano.ceccherini@gmail.com) 8 */ 9 10 //! BMenuWindow is a custom BWindow for BMenus. 11 12 #include <MenuWindow.h> 13 14 #include <ControlLook.h> 15 #include <Debug.h> 16 #include <Menu.h> 17 #include <MenuItem.h> 18 19 #include <MenuPrivate.h> 20 #include <WindowPrivate.h> 21 22 23 namespace BPrivate { 24 25 class BMenuScroller : public BView { 26 public: 27 BMenuScroller(BRect frame); 28 29 bool IsEnabled() const; 30 void SetEnabled(bool enabled); 31 32 private: 33 bool fEnabled; 34 }; 35 36 37 class BMenuFrame : public BView { 38 public: 39 BMenuFrame(BMenu* menu); 40 41 virtual void AttachedToWindow(); 42 virtual void DetachedFromWindow(); 43 virtual void Draw(BRect updateRect); 44 45 private: 46 friend class BMenuWindow; 47 48 BMenu* fMenu; 49 }; 50 51 52 class UpperScroller : public BMenuScroller { 53 public: 54 UpperScroller(BRect frame); 55 56 virtual void Draw(BRect updateRect); 57 }; 58 59 60 class LowerScroller : public BMenuScroller { 61 public: 62 LowerScroller(BRect frame); 63 64 virtual void Draw(BRect updateRect); 65 }; 66 67 68 } // namespace BPrivate 69 70 71 using namespace BPrivate; 72 73 74 const int kScrollerHeight = 12; 75 76 77 BMenuScroller::BMenuScroller(BRect frame) 78 : 79 BView(frame, "menu scroller", 0, B_WILL_DRAW | B_FRAME_EVENTS), 80 fEnabled(false) 81 { 82 SetViewColor(ui_color(B_MENU_BACKGROUND_COLOR)); 83 } 84 85 86 bool 87 BMenuScroller::IsEnabled() const 88 { 89 return fEnabled; 90 } 91 92 93 void 94 BMenuScroller::SetEnabled(bool enabled) 95 { 96 fEnabled = enabled; 97 } 98 99 100 // #pragma mark - 101 102 103 UpperScroller::UpperScroller(BRect frame) 104 : 105 BMenuScroller(frame) 106 { 107 } 108 109 110 void 111 UpperScroller::Draw(BRect updateRect) 112 { 113 SetLowColor(tint_color(ui_color(B_MENU_BACKGROUND_COLOR), B_DARKEN_1_TINT)); 114 float middle = Bounds().right / 2; 115 116 // Draw the upper arrow. 117 if (IsEnabled()) 118 SetHighColor(0, 0, 0); 119 else { 120 SetHighColor(tint_color(ui_color(B_MENU_BACKGROUND_COLOR), 121 B_DARKEN_2_TINT)); 122 } 123 124 FillRect(Bounds(), B_SOLID_LOW); 125 126 FillTriangle(BPoint(middle, (kScrollerHeight / 2) - 3), 127 BPoint(middle + 5, (kScrollerHeight / 2) + 2), 128 BPoint(middle - 5, (kScrollerHeight / 2) + 2)); 129 } 130 131 132 // #pragma mark - 133 134 135 LowerScroller::LowerScroller(BRect frame) 136 : 137 BMenuScroller(frame) 138 { 139 } 140 141 142 void 143 LowerScroller::Draw(BRect updateRect) 144 { 145 SetLowColor(tint_color(ui_color(B_MENU_BACKGROUND_COLOR), B_DARKEN_1_TINT)); 146 147 BRect frame = Bounds(); 148 // Draw the lower arrow. 149 if (IsEnabled()) 150 SetHighColor(0, 0, 0); 151 else { 152 SetHighColor(tint_color(ui_color(B_MENU_BACKGROUND_COLOR), 153 B_DARKEN_2_TINT)); 154 } 155 156 FillRect(frame, B_SOLID_LOW); 157 158 float middle = Bounds().right / 2; 159 160 FillTriangle(BPoint(middle, frame.bottom - (kScrollerHeight / 2) + 3), 161 BPoint(middle + 5, frame.bottom - (kScrollerHeight / 2) - 2), 162 BPoint(middle - 5, frame.bottom - (kScrollerHeight / 2) - 2)); 163 } 164 165 166 // #pragma mark - 167 168 169 BMenuFrame::BMenuFrame(BMenu *menu) 170 : 171 BView(BRect(0, 0, 1, 1), "menu frame", B_FOLLOW_ALL_SIDES, B_WILL_DRAW), 172 fMenu(menu) 173 { 174 } 175 176 177 void 178 BMenuFrame::AttachedToWindow() 179 { 180 BView::AttachedToWindow(); 181 182 if (fMenu != NULL) 183 AddChild(fMenu); 184 185 ResizeTo(Window()->Bounds().Width(), Window()->Bounds().Height()); 186 if (fMenu != NULL) { 187 BFont font; 188 fMenu->GetFont(&font); 189 SetFont(&font); 190 } 191 } 192 193 194 void 195 BMenuFrame::DetachedFromWindow() 196 { 197 if (fMenu != NULL) 198 RemoveChild(fMenu); 199 } 200 201 202 void 203 BMenuFrame::Draw(BRect updateRect) 204 { 205 if (fMenu != NULL && fMenu->CountItems() == 0) { 206 if (be_control_look != NULL) { 207 BRect rect(Bounds()); 208 be_control_look->DrawMenuBackground(this, rect, updateRect, 209 ui_color(B_MENU_BACKGROUND_COLOR)); 210 SetDrawingMode(B_OP_OVER); 211 } else { 212 // TODO: Review this as it's a bit hacky. 213 // Menu has a size of 0, 0, since there are no items in it. 214 // So the BMenuFrame class has to fake it and draw an empty item. 215 // Note that we can't add a real "empty" item because then we 216 // couldn't tell if the item was added by us or not. 217 // See also BMenu::UpdateWindowViewSize() 218 SetHighColor(ui_color(B_MENU_BACKGROUND_COLOR)); 219 SetLowColor(HighColor()); 220 FillRect(updateRect); 221 } 222 223 font_height height; 224 GetFontHeight(&height); 225 SetHighColor(tint_color(ui_color(B_MENU_BACKGROUND_COLOR), 226 B_DISABLED_LABEL_TINT)); 227 BPoint where( 228 (Bounds().Width() - fMenu->StringWidth(kEmptyMenuLabel)) / 2, 229 ceilf(height.ascent + 1)); 230 DrawString(kEmptyMenuLabel, where); 231 } 232 233 if (be_control_look != NULL) 234 return; 235 236 SetHighColor(tint_color(ui_color(B_MENU_BACKGROUND_COLOR), 237 B_DARKEN_2_TINT)); 238 BRect bounds(Bounds()); 239 240 StrokeLine(BPoint(bounds.right, bounds.top), 241 BPoint(bounds.right, bounds.bottom - 1)); 242 StrokeLine(BPoint(bounds.left + 1, bounds.bottom), 243 BPoint(bounds.right, bounds.bottom)); 244 } 245 246 247 248 // #pragma mark - 249 250 251 BMenuWindow::BMenuWindow(const char *name) 252 // The window will be resized by BMenu, so just pass a dummy rect 253 : 254 BWindow(BRect(0, 0, 0, 0), name, B_BORDERED_WINDOW_LOOK, kMenuWindowFeel, 255 B_NOT_MOVABLE | B_NOT_ZOOMABLE | B_NOT_RESIZABLE | B_AVOID_FOCUS 256 | kAcceptKeyboardFocusFlag), 257 fMenu(NULL), 258 fMenuFrame(NULL), 259 fUpperScroller(NULL), 260 fLowerScroller(NULL), 261 fScrollStep(19) 262 { 263 SetSizeLimits(2, 10000, 2, 10000); 264 } 265 266 267 BMenuWindow::~BMenuWindow() 268 { 269 DetachMenu(); 270 } 271 272 273 void 274 BMenuWindow::DispatchMessage(BMessage *message, BHandler *handler) 275 { 276 BWindow::DispatchMessage(message, handler); 277 } 278 279 280 void 281 BMenuWindow::AttachMenu(BMenu *menu) 282 { 283 if (fMenuFrame) 284 debugger("BMenuWindow: a menu is already attached!"); 285 if (menu != NULL) { 286 fMenuFrame = new BMenuFrame(menu); 287 AddChild(fMenuFrame); 288 menu->MakeFocus(true); 289 fMenu = menu; 290 } 291 } 292 293 294 void 295 BMenuWindow::DetachMenu() 296 { 297 DetachScrollers(); 298 if (fMenuFrame) { 299 RemoveChild(fMenuFrame); 300 delete fMenuFrame; 301 fMenuFrame = NULL; 302 fMenu = NULL; 303 } 304 } 305 306 307 void 308 BMenuWindow::AttachScrollers() 309 { 310 // We want to attach a scroller only if there's a 311 // menu frame already existing. 312 if (!fMenu || !fMenuFrame) 313 return; 314 315 fMenu->MakeFocus(true); 316 317 BRect frame = Bounds(); 318 319 if (fUpperScroller == NULL) { 320 fUpperScroller = new UpperScroller( 321 BRect(0, 0, frame.right, kScrollerHeight - 1)); 322 AddChild(fUpperScroller); 323 } 324 325 if (fLowerScroller == NULL) { 326 fLowerScroller = new LowerScroller( 327 BRect(0, frame.bottom - kScrollerHeight + 1, frame.right, 328 frame.bottom)); 329 AddChild(fLowerScroller); 330 } 331 332 fUpperScroller->SetEnabled(false); 333 fLowerScroller->SetEnabled(true); 334 335 fMenuFrame->ResizeBy(0, -2 * kScrollerHeight); 336 fMenuFrame->MoveBy(0, kScrollerHeight); 337 338 fValue = 0; 339 fLimit = fMenu->Bounds().Height() - (frame.Height() - 2 * kScrollerHeight); 340 } 341 342 343 void 344 BMenuWindow::DetachScrollers() 345 { 346 // BeOS doesn't remember the position where the last scrolling ended, 347 // so we just scroll back to the beginning. 348 if (fMenu) 349 fMenu->ScrollTo(0, 0); 350 351 if (fLowerScroller) { 352 RemoveChild(fLowerScroller); 353 delete fLowerScroller; 354 fLowerScroller = NULL; 355 } 356 357 if (fUpperScroller) { 358 RemoveChild(fUpperScroller); 359 delete fUpperScroller; 360 fUpperScroller = NULL; 361 } 362 } 363 364 365 void 366 BMenuWindow::SetSmallStep(float step) 367 { 368 fScrollStep = step; 369 } 370 371 372 void 373 BMenuWindow::GetSteps(float* _smallStep, float* _largeStep) const 374 { 375 if (_smallStep != NULL) 376 *_smallStep = fScrollStep; 377 if (_largeStep != NULL) { 378 if (fMenuFrame != NULL) 379 *_largeStep = fMenuFrame->Bounds().Height() - fScrollStep; 380 else 381 *_largeStep = fScrollStep * 2; 382 } 383 } 384 385 386 bool 387 BMenuWindow::HasScrollers() const 388 { 389 return fMenuFrame != NULL && fUpperScroller != NULL 390 && fLowerScroller != NULL; 391 } 392 393 394 bool 395 BMenuWindow::CheckForScrolling(const BPoint &cursor) 396 { 397 if (!fMenuFrame || !fUpperScroller || !fLowerScroller) 398 return false; 399 400 return _Scroll(cursor); 401 } 402 403 404 bool 405 BMenuWindow::TryScrollBy(const float& step) 406 { 407 if (!fMenuFrame || !fUpperScroller || !fLowerScroller) 408 return false; 409 410 _ScrollBy(step); 411 return true; 412 } 413 414 415 bool 416 BMenuWindow::TryScrollTo(const float& where) 417 { 418 if (!fMenuFrame || !fUpperScroller || !fLowerScroller) 419 return false; 420 421 _ScrollBy(where - fValue); 422 return true; 423 } 424 425 426 bool 427 BMenuWindow::_Scroll(const BPoint& where) 428 { 429 ASSERT((fLowerScroller != NULL)); 430 ASSERT((fUpperScroller != NULL)); 431 432 const BPoint cursor = ConvertFromScreen(where); 433 const BRect &lowerFrame = fLowerScroller->Frame(); 434 const BRect &upperFrame = fUpperScroller->Frame(); 435 436 int32 delta = 0; 437 if (fLowerScroller->IsEnabled() && lowerFrame.Contains(cursor)) 438 delta = 1; 439 else if (fUpperScroller->IsEnabled() && upperFrame.Contains(cursor)) 440 delta = -1; 441 442 if (delta == 0) 443 return false; 444 445 float smallStep; 446 GetSteps(&smallStep, NULL); 447 _ScrollBy(smallStep * delta); 448 449 snooze(5000); 450 451 return true; 452 } 453 454 455 void 456 BMenuWindow::_ScrollBy(const float& step) 457 { 458 if (step > 0) { 459 if (fValue == 0) { 460 fUpperScroller->SetEnabled(true); 461 fUpperScroller->Invalidate(); 462 } 463 464 if (fValue + step >= fLimit) { 465 // If we reached the limit, only scroll to the end 466 fMenu->ScrollBy(0, fLimit - fValue); 467 fValue = fLimit; 468 fLowerScroller->SetEnabled(false); 469 fLowerScroller->Invalidate(); 470 } else { 471 fMenu->ScrollBy(0, step); 472 fValue += step; 473 } 474 } else if (step < 0) { 475 if (fValue == fLimit) { 476 fLowerScroller->SetEnabled(true); 477 fLowerScroller->Invalidate(); 478 } 479 480 if (fValue + step <= 0) { 481 fMenu->ScrollBy(0, -fValue); 482 fValue = 0; 483 fUpperScroller->SetEnabled(false); 484 fUpperScroller->Invalidate(); 485 } else { 486 fMenu->ScrollBy(0, step); 487 fValue += step; 488 } 489 } 490 } 491 492