1 2 /* 3 * Copyright 2011 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 #include "SkScrollBarView.h" 9 #include "SkAnimator.h" 10 #include "SkWidgetViews.h" 11 #include "SkSystemEventTypes.h" 12 #include "SkTime.h" 13 14 //see SkProgressBarView.cpp 15 //#include "SkWidgetViews.cpp" 16 17 SkScrollBarView::SkScrollBarView() 18 { 19 fAnim.setHostEventSink(this); 20 init_skin_anim(kScroll_SkinEnum, &fAnim); 21 22 fTotalLength = 0; 23 fStartPoint = 0; 24 fShownLength = 0; 25 26 this->adjust(); 27 } 28 29 void SkScrollBarView::setStart(unsigned start) 30 { 31 if ((int)start < 0) 32 start = 0; 33 34 if (fStartPoint != start) 35 { 36 fStartPoint = start; 37 this->adjust(); 38 } 39 } 40 41 void SkScrollBarView::setShown(unsigned shown) 42 { 43 if ((int)shown < 0) 44 shown = 0; 45 46 if (fShownLength != shown) 47 { 48 fShownLength = shown; 49 this->adjust(); 50 } 51 } 52 53 void SkScrollBarView::setTotal(unsigned total) 54 { 55 if ((int)total < 0) 56 total = 0; 57 58 if (fTotalLength != total) 59 { 60 fTotalLength = total; 61 this->adjust(); 62 } 63 } 64 65 /* virtual */ void SkScrollBarView::onInflate(const SkDOM& dom, const SkDOM::Node* node) 66 { 67 this->INHERITED::onInflate(dom, node); 68 69 int32_t value; 70 if (dom.findS32(node, "total", &value)) 71 this->setTotal(value); 72 if (dom.findS32(node, "shown", &value)) 73 this->setShown(value); 74 } 75 76 /*virtual*/ void SkScrollBarView::onSizeChange() 77 { 78 this->INHERITED::onSizeChange(); 79 SkEvent evt("user"); 80 evt.setString("id", "setDim"); 81 evt.setScalar("dimX", this->width()); 82 evt.setScalar("dimY", this->height()); 83 fAnim.doUserEvent(evt); 84 } 85 86 /*virtual*/ void SkScrollBarView::onDraw(SkCanvas* canvas) 87 { 88 SkPaint paint; 89 SkAnimator::DifferenceType diff = fAnim.draw(canvas, &paint, SkTime::GetMSecs()); 90 91 if (diff == SkAnimator::kDifferent) 92 this->inval(nullptr); 93 else if (diff == SkAnimator::kPartiallyDifferent) 94 { 95 SkRect bounds; 96 fAnim.getInvalBounds(&bounds); 97 this->inval(&bounds); 98 } 99 } 100 101 /*virtual*/ bool SkScrollBarView::onEvent(const SkEvent& evt) 102 { 103 if (evt.isType(SK_EventType_Inval)) 104 { 105 this->inval(nullptr); 106 return true; 107 } 108 if (evt.isType("recommendDim")) 109 { 110 SkScalar width; 111 112 if (evt.findScalar("x", &width)) 113 this->setWidth(width); 114 return true; 115 } 116 117 return this->INHERITED::onEvent(evt); 118 } 119 120 void SkScrollBarView::adjust() 121 { 122 int total = fTotalLength; 123 int start = fStartPoint; 124 int shown = fShownLength; 125 // int hideBar = 0; 126 127 if (total <= 0 || shown <= 0 || shown >= total) // no bar to show 128 { 129 total = 1; // avoid divide-by-zero. should be done by skin/script 130 // hideBar = 1; // signal we don't want a thumb 131 } 132 else 133 { 134 if (start + shown > total) 135 start = total - shown; 136 } 137 138 SkEvent e("user"); 139 e.setString("id", "adjustScrollBar"); 140 e.setScalar("_totalLength", SkIntToScalar(total)); 141 e.setScalar("_startPoint", SkIntToScalar(start)); 142 e.setScalar("_shownLength", SkIntToScalar(shown)); 143 // e.setS32("hideBar", hideBar); 144 fAnim.doUserEvent(e); 145 } 146