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