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| 1 /* | |
| 2 * Copyright (C) 2004, 2006, 2008 Apple Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * 1. Redistributions of source code must retain the above copyright | |
| 8 * notice, this list of conditions and the following disclaimer. | |
| 9 * 2. Redistributions in binary form must reproduce the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer in the | |
| 11 * documentation and/or other materials provided with the distribution. | |
| 12 * | |
| 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY | |
| 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR | |
| 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 24 */ | |
| 25 | |
| 26 #include "sky/engine/config.h" | |
| 27 #include "sky/engine/platform/scroll/Scrollbar.h" | |
| 28 | |
| 29 #include "sky/engine/platform/graphics/GraphicsContext.h" | |
| 30 #include "sky/engine/platform/scroll/ScrollAnimator.h" | |
| 31 #include "sky/engine/platform/scroll/ScrollableArea.h" | |
| 32 #include "sky/engine/platform/scroll/Scrollbar.h" | |
| 33 #include "sky/engine/public/platform/Platform.h" | |
| 34 #include "sky/engine/public/platform/WebPoint.h" | |
| 35 #include "sky/engine/public/platform/WebRect.h" | |
| 36 | |
| 37 // The position of the scrollbar thumb affects the appearance of the steppers, s
o | |
| 38 // when the thumb moves, we have to invalidate them for painting. | |
| 39 #define THUMB_POSITION_AFFECTS_BUTTONS | |
| 40 | |
| 41 namespace blink { | |
| 42 | |
| 43 static const int kThumbThickness = 3; | |
| 44 static const int kScrollbarMargin = 3; | |
| 45 | |
| 46 PassRefPtr<Scrollbar> Scrollbar::create(ScrollableArea* scrollableArea, Scrollba
rOrientation orientation) | |
| 47 { | |
| 48 return adoptRef(new Scrollbar(scrollableArea, orientation)); | |
| 49 } | |
| 50 | |
| 51 Scrollbar::Scrollbar(ScrollableArea* scrollableArea, ScrollbarOrientation orient
ation) | |
| 52 : m_scrollableArea(scrollableArea) | |
| 53 , m_orientation(orientation) | |
| 54 , m_visibleSize(0) | |
| 55 , m_totalSize(0) | |
| 56 , m_currentPos(0) | |
| 57 , m_dragOrigin(0) | |
| 58 , m_hoveredPart(NoPart) | |
| 59 , m_pressedPart(NoPart) | |
| 60 , m_pressedPos(0) | |
| 61 , m_scrollPos(0) | |
| 62 , m_documentDragPos(0) | |
| 63 , m_scrollTimer(this, &Scrollbar::autoscrollTimerFired) | |
| 64 , m_overlapsResizer(false) | |
| 65 { | |
| 66 // FIXME: This is ugly and would not be necessary if we fix cross-platform c
ode to actually query for | |
| 67 // scrollbar thickness and use it when sizing scrollbars (rather than leavin
g one dimension of the scrollbar | |
| 68 // alone when sizing). | |
| 69 int thickness = scrollbarThickness(); | |
| 70 Widget::setFrameRect(IntRect(0, 0, thickness, thickness)); | |
| 71 | |
| 72 m_currentPos = scrollableAreaCurrentPos(); | |
| 73 } | |
| 74 | |
| 75 Scrollbar::~Scrollbar() | |
| 76 { | |
| 77 stopTimerIfNeeded(); | |
| 78 } | |
| 79 | |
| 80 bool Scrollbar::isScrollableAreaActive() const | |
| 81 { | |
| 82 return m_scrollableArea && m_scrollableArea->isActive(); | |
| 83 } | |
| 84 | |
| 85 bool Scrollbar::isLeftSideVerticalScrollbar() const | |
| 86 { | |
| 87 if (m_orientation == VerticalScrollbar && m_scrollableArea) | |
| 88 return m_scrollableArea->shouldPlaceVerticalScrollbarOnLeft(); | |
| 89 return false; | |
| 90 } | |
| 91 | |
| 92 void Scrollbar::offsetDidChange() | |
| 93 { | |
| 94 ASSERT(m_scrollableArea); | |
| 95 | |
| 96 float position = scrollableAreaCurrentPos(); | |
| 97 if (position == m_currentPos) | |
| 98 return; | |
| 99 | |
| 100 int oldThumbPosition = thumbPosition(); | |
| 101 m_currentPos = position; | |
| 102 if (m_pressedPart == ThumbPart) | |
| 103 setPressedPos(m_pressedPos + thumbPosition() - oldThumbPosition); | |
| 104 } | |
| 105 | |
| 106 void Scrollbar::setProportion(int visibleSize, int totalSize) | |
| 107 { | |
| 108 if (visibleSize == m_visibleSize && totalSize == m_totalSize) | |
| 109 return; | |
| 110 | |
| 111 m_visibleSize = visibleSize; | |
| 112 m_totalSize = totalSize; | |
| 113 } | |
| 114 | |
| 115 void Scrollbar::paint(GraphicsContext* context, const IntRect& damageRect) | |
| 116 { | |
| 117 if (!frameRect().intersects(damageRect)) | |
| 118 return; | |
| 119 | |
| 120 IntRect startTrackRect; | |
| 121 IntRect thumbRect; | |
| 122 IntRect endTrackRect; | |
| 123 splitTrack(trackRect(), startTrackRect, thumbRect, endTrackRect); | |
| 124 if (damageRect.intersects(thumbRect)) | |
| 125 paintThumb(context, thumbRect); | |
| 126 } | |
| 127 | |
| 128 void Scrollbar::autoscrollTimerFired(Timer<Scrollbar>*) | |
| 129 { | |
| 130 autoscrollPressedPart(autoscrollTimerDelay()); | |
| 131 } | |
| 132 | |
| 133 void Scrollbar::autoscrollPressedPart(double delay) | |
| 134 { | |
| 135 // Don't do anything for the thumb or if nothing was pressed. | |
| 136 if (m_pressedPart == ThumbPart || m_pressedPart == NoPart) | |
| 137 return; | |
| 138 | |
| 139 // Handle the arrows and track. | |
| 140 if (m_scrollableArea && m_scrollableArea->scroll(pressedPartScrollDirection(
), pressedPartScrollGranularity())) | |
| 141 startTimerIfNeeded(delay); | |
| 142 } | |
| 143 | |
| 144 void Scrollbar::startTimerIfNeeded(double delay) | |
| 145 { | |
| 146 // Don't do anything for the thumb. | |
| 147 if (m_pressedPart == ThumbPart) | |
| 148 return; | |
| 149 | |
| 150 // We can't scroll if we've hit the beginning or end. | |
| 151 ScrollDirection dir = pressedPartScrollDirection(); | |
| 152 if (dir == ScrollUp || dir == ScrollLeft) { | |
| 153 if (m_currentPos == 0) | |
| 154 return; | |
| 155 } else { | |
| 156 if (m_currentPos == maximum()) | |
| 157 return; | |
| 158 } | |
| 159 | |
| 160 m_scrollTimer.startOneShot(delay, FROM_HERE); | |
| 161 } | |
| 162 | |
| 163 void Scrollbar::stopTimerIfNeeded() | |
| 164 { | |
| 165 if (m_scrollTimer.isActive()) | |
| 166 m_scrollTimer.stop(); | |
| 167 } | |
| 168 | |
| 169 ScrollDirection Scrollbar::pressedPartScrollDirection() | |
| 170 { | |
| 171 if (m_orientation == HorizontalScrollbar) { | |
| 172 if (m_pressedPart == BackTrackPart) | |
| 173 return ScrollLeft; | |
| 174 return ScrollRight; | |
| 175 } else { | |
| 176 if (m_pressedPart == BackTrackPart) | |
| 177 return ScrollUp; | |
| 178 return ScrollDown; | |
| 179 } | |
| 180 } | |
| 181 | |
| 182 ScrollGranularity Scrollbar::pressedPartScrollGranularity() | |
| 183 { | |
| 184 // FIXME(sky): Remove | |
| 185 return ScrollByPage; | |
| 186 } | |
| 187 | |
| 188 void Scrollbar::moveThumb(int pos) | |
| 189 { | |
| 190 if (!m_scrollableArea) | |
| 191 return; | |
| 192 | |
| 193 int delta = pos - m_pressedPos; | |
| 194 | |
| 195 // Drag the thumb. | |
| 196 int thumbPos = thumbPosition(); | |
| 197 int thumbLen = thumbLength(); | |
| 198 int trackLen = trackLength(); | |
| 199 if (delta > 0) | |
| 200 delta = std::min(trackLen - thumbLen - thumbPos, delta); | |
| 201 else if (delta < 0) | |
| 202 delta = std::max(-thumbPos, delta); | |
| 203 | |
| 204 float minPos = m_scrollableArea->minimumScrollPosition(m_orientation); | |
| 205 float maxPos = m_scrollableArea->maximumScrollPosition(m_orientation); | |
| 206 if (delta) { | |
| 207 float newPosition = static_cast<float>(thumbPos + delta) * (maxPos - min
Pos) / (trackLen - thumbLen) + minPos; | |
| 208 m_scrollableArea->scrollToOffsetWithoutAnimation(m_orientation, newPosit
ion); | |
| 209 } | |
| 210 } | |
| 211 | |
| 212 void Scrollbar::setHoveredPart(ScrollbarPart part) | |
| 213 { | |
| 214 if (part == m_hoveredPart) | |
| 215 return; | |
| 216 m_hoveredPart = part; | |
| 217 } | |
| 218 | |
| 219 void Scrollbar::setPressedPart(ScrollbarPart part) | |
| 220 { | |
| 221 m_pressedPart = part; | |
| 222 } | |
| 223 | |
| 224 bool Scrollbar::isOverlayScrollbar() const | |
| 225 { | |
| 226 // FIXME(sky): Remove | |
| 227 return true; | |
| 228 } | |
| 229 | |
| 230 bool Scrollbar::shouldParticipateInHitTesting() | |
| 231 { | |
| 232 // Non-overlay scrollbars should always participate in hit testing. | |
| 233 if (!isOverlayScrollbar()) | |
| 234 return true; | |
| 235 return m_scrollableArea->scrollAnimator()->shouldScrollbarParticipateInHitTe
sting(this); | |
| 236 } | |
| 237 | |
| 238 IntRect Scrollbar::convertToContainingView(const IntRect& localRect) const | |
| 239 { | |
| 240 if (m_scrollableArea) | |
| 241 return m_scrollableArea->convertFromScrollbarToContainingView(this, loca
lRect); | |
| 242 | |
| 243 return Widget::convertToContainingView(localRect); | |
| 244 } | |
| 245 | |
| 246 IntRect Scrollbar::convertFromContainingView(const IntRect& parentRect) const | |
| 247 { | |
| 248 if (m_scrollableArea) | |
| 249 return m_scrollableArea->convertFromContainingViewToScrollbar(this, pare
ntRect); | |
| 250 | |
| 251 return Widget::convertFromContainingView(parentRect); | |
| 252 } | |
| 253 | |
| 254 IntPoint Scrollbar::convertToContainingView(const IntPoint& localPoint) const | |
| 255 { | |
| 256 if (m_scrollableArea) | |
| 257 return m_scrollableArea->convertFromScrollbarToContainingView(this, loca
lPoint); | |
| 258 | |
| 259 return Widget::convertToContainingView(localPoint); | |
| 260 } | |
| 261 | |
| 262 IntPoint Scrollbar::convertFromContainingView(const IntPoint& parentPoint) const | |
| 263 { | |
| 264 if (m_scrollableArea) | |
| 265 return m_scrollableArea->convertFromContainingViewToScrollbar(this, pare
ntPoint); | |
| 266 | |
| 267 return Widget::convertFromContainingView(parentPoint); | |
| 268 } | |
| 269 | |
| 270 float Scrollbar::scrollableAreaCurrentPos() const | |
| 271 { | |
| 272 if (!m_scrollableArea) | |
| 273 return 0; | |
| 274 | |
| 275 if (m_orientation == HorizontalScrollbar) | |
| 276 return m_scrollableArea->scrollPosition().x() - m_scrollableArea->minimu
mScrollPosition().x(); | |
| 277 | |
| 278 return m_scrollableArea->scrollPosition().y() - m_scrollableArea->minimumScr
ollPosition().y(); | |
| 279 } | |
| 280 | |
| 281 int Scrollbar::scrollbarThickness() | |
| 282 { | |
| 283 return kThumbThickness + kScrollbarMargin; | |
| 284 } | |
| 285 | |
| 286 int Scrollbar::thumbPosition() | |
| 287 { | |
| 288 if (!totalSize()) | |
| 289 return 0; | |
| 290 | |
| 291 int trackLen = trackLength(); | |
| 292 float proportion = static_cast<float>(currentPos()) / totalSize(); | |
| 293 return round(proportion * trackLen); | |
| 294 } | |
| 295 | |
| 296 int Scrollbar::thumbLength() | |
| 297 { | |
| 298 int trackLen = trackLength(); | |
| 299 | |
| 300 if (!totalSize()) | |
| 301 return trackLen; | |
| 302 | |
| 303 float proportion = static_cast<float>(visibleSize()) / totalSize(); | |
| 304 int length = round(proportion * trackLen); | |
| 305 length = std::min(std::max(length, minimumThumbLength()), trackLen); | |
| 306 return length; | |
| 307 } | |
| 308 | |
| 309 int Scrollbar::trackPosition() | |
| 310 { | |
| 311 IntRect rect = trackRect(); | |
| 312 return (orientation() == HorizontalScrollbar) ? rect.x() - x() : rect.y() -
y(); | |
| 313 } | |
| 314 | |
| 315 int Scrollbar::trackLength() | |
| 316 { | |
| 317 IntRect rect = trackRect(); | |
| 318 return (orientation() == HorizontalScrollbar) ? rect.width() : rect.height()
; | |
| 319 } | |
| 320 | |
| 321 IntRect Scrollbar::trackRect() | |
| 322 { | |
| 323 IntRect rect = frameRect(); | |
| 324 if (orientation() == HorizontalScrollbar) | |
| 325 rect.inflateX(-kScrollbarMargin); | |
| 326 else | |
| 327 rect.inflateY(-kScrollbarMargin); | |
| 328 return rect; | |
| 329 } | |
| 330 | |
| 331 IntRect Scrollbar::thumbRect() | |
| 332 { | |
| 333 IntRect track = trackRect(); | |
| 334 IntRect startTrackRect; | |
| 335 IntRect thumbRect; | |
| 336 IntRect endTrackRect; | |
| 337 splitTrack(track, startTrackRect, thumbRect, endTrackRect); | |
| 338 | |
| 339 return thumbRect; | |
| 340 } | |
| 341 | |
| 342 int Scrollbar::thumbThickness() | |
| 343 { | |
| 344 return kThumbThickness; | |
| 345 } | |
| 346 | |
| 347 int Scrollbar::minimumThumbLength() | |
| 348 { | |
| 349 return scrollbarThickness(); | |
| 350 } | |
| 351 | |
| 352 void Scrollbar::splitTrack(const IntRect& trackRect, IntRect& beforeThumbRect, I
ntRect& thumbRect, IntRect& afterThumbRect) | |
| 353 { | |
| 354 // This function won't even get called unless we're big enough to have some
combination of these three rects where at least | |
| 355 // one of them is non-empty. | |
| 356 int thumbPos = thumbPosition(); | |
| 357 if (orientation() == HorizontalScrollbar) { | |
| 358 thumbRect = IntRect(trackRect.x() + thumbPos, trackRect.y(), thumbLength
(), height()); | |
| 359 beforeThumbRect = IntRect(trackRect.x(), trackRect.y(), thumbPos + thumb
Rect.width() / 2, trackRect.height()); | |
| 360 afterThumbRect = IntRect(trackRect.x() + beforeThumbRect.width(), trackR
ect.y(), trackRect.maxX() - beforeThumbRect.maxX(), trackRect.height()); | |
| 361 } else { | |
| 362 thumbRect = IntRect(trackRect.x(), trackRect.y() + thumbPos, width(), th
umbLength()); | |
| 363 beforeThumbRect = IntRect(trackRect.x(), trackRect.y(), trackRect.width(
), thumbPos + thumbRect.height() / 2); | |
| 364 afterThumbRect = IntRect(trackRect.x(), trackRect.y() + beforeThumbRect.
height(), trackRect.width(), trackRect.maxY() - beforeThumbRect.maxY()); | |
| 365 } | |
| 366 } | |
| 367 | |
| 368 void Scrollbar::paintThumb(GraphicsContext* context, const IntRect& rect) | |
| 369 { | |
| 370 // FIXME(sky): This function appears to be dead code. | |
| 371 IntRect thumbRect = rect; | |
| 372 if (orientation() == HorizontalScrollbar) { | |
| 373 thumbRect.setHeight(thumbRect.height() - kScrollbarMargin); | |
| 374 } else { | |
| 375 thumbRect.setWidth(thumbRect.width() - kScrollbarMargin); | |
| 376 if (isLeftSideVerticalScrollbar()) | |
| 377 thumbRect.setX(thumbRect.x() + kScrollbarMargin); | |
| 378 } | |
| 379 | |
| 380 DEFINE_STATIC_LOCAL(Color, color, (128, 128, 128, 128)); | |
| 381 context->fillRect(thumbRect, color); | |
| 382 } | |
| 383 | |
| 384 } // namespace blink | |
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Chromium Code Reviews
Issue 879993004:
Remove ScrollableArea and Scrollbar (Closed)
Base URL: git@github.com:domokit/mojo.git@master