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      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(NULL);
     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(NULL);
    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 
    147