1 #define LOG_TAG "ScrollableLayerAndroid" 2 #define LOG_NDEBUG 1 3 4 #include "config.h" 5 #include "ScrollableLayerAndroid.h" 6 7 #include "GLWebViewState.h" 8 9 #if USE(ACCELERATED_COMPOSITING) 10 11 #include "AndroidLog.h" 12 13 namespace WebCore { 14 15 bool ScrollableLayerAndroid::scrollTo(int x, int y) 16 { 17 IntRect scrollBounds; 18 getScrollBounds(&scrollBounds); 19 if (!scrollBounds.width() && !scrollBounds.height()) 20 return false; 21 SkScalar newX = SkScalarPin(x, scrollBounds.x(), scrollBounds.width()); 22 SkScalar newY = SkScalarPin(y, scrollBounds.y(), scrollBounds.height()); 23 // Check for no change. 24 if (newX == getScrollOffset().x() && newY == getScrollOffset().y()) 25 return false; 26 setScrollOffset(IntPoint(newX, newY)); 27 return true; 28 } 29 30 void ScrollableLayerAndroid::getScrollBounds(IntRect* out) const 31 { 32 out->setX(m_scrollLimits.fLeft); 33 out->setY(m_scrollLimits.fTop); 34 out->setWidth(m_scrollLimits.width()); 35 out->setHeight(m_scrollLimits.height()); 36 } 37 38 void ScrollableLayerAndroid::getScrollRect(SkIRect* out) const 39 { 40 out->fLeft = getScrollOffset().x(); 41 out->fTop = getScrollOffset().y(); 42 43 out->fRight = m_scrollLimits.width(); 44 out->fBottom = m_scrollLimits.height(); 45 } 46 47 void ScrollableLayerAndroid::setScrollLimits(float minX, float minY, 48 float maxX, float maxY) 49 { 50 if (minX < 0) minX = 0; 51 if (minY < 0) minY = 0; 52 if (maxX < 0) maxX = 0; 53 if (maxY < 0) maxY = 0; 54 if (minX > maxX) minX = maxX; 55 if (minY > maxY) minY = maxY; 56 m_scrollLimits.set(minX, minY, minX + maxX, minY + maxY); 57 } 58 59 bool ScrollableLayerAndroid::scrollRectIntoView(const SkIRect& rect) 60 { 61 // Apply the local transform to the rect to get it relative to the parent 62 // layer. 63 SkMatrix localTransform; 64 getLocalTransform(&localTransform); 65 SkRect transformedRect; 66 transformedRect.set(rect); 67 localTransform.mapRect(&transformedRect); 68 69 // Test left before right to prioritize left alignment if transformedRect is wider than 70 // visible area. 71 int x = m_scrollLimits.fLeft; 72 if (transformedRect.fLeft < m_scrollLimits.fLeft) 73 x = transformedRect.fLeft; 74 else if (transformedRect.fRight > m_scrollLimits.fRight) 75 x = transformedRect.fRight - std::max(m_scrollLimits.width(), transformedRect.width()); 76 77 // Test top before bottom to prioritize top alignment if transformedRect is taller than 78 // visible area. 79 int y = m_scrollLimits.fTop; 80 if (transformedRect.fTop < m_scrollLimits.fTop) 81 y = transformedRect.fTop; 82 else if (transformedRect.fBottom > m_scrollLimits.fBottom) 83 y = transformedRect.fBottom - std::max(m_scrollLimits.height(), transformedRect.height()); 84 85 return scrollTo(x - getPosition().fX, y - getPosition().fY); 86 } 87 88 } // namespace WebCore 89 90 #endif // USE(ACCELERATED_COMPOSITING) 91
