SkProgressView.cpp revision f8cacf6b11e35785df8efb613b0c3592d535f603 
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 "SkWidget.h"
9#include "SkCanvas.h"
10#include "SkMath.h"
11#include "SkShader.h"
12#include "SkInterpolator.h"
13#include "SkTime.h"
14
15SkProgressView::SkProgressView(uint32_t flags) : SkView(flags), fOnShader(NULL), fOffShader(NULL)
16{
17	fValue = 0;
18	fMax = 0;
19	fInterp = NULL;
20	fDoInterp = false;
21}
22
23SkProgressView::~SkProgressView()
24{
25	delete fInterp;
26	SkSafeUnref(fOnShader);
27	SkSafeUnref(fOffShader);
28}
29
30void SkProgressView::setMax(U16CPU max)
31{
32	if (fMax != max)
33	{
34		fMax = SkToU16(max);
35		if (fValue > 0)
36			this->inval(NULL);
37	}
38}
39
40void SkProgressView::setValue(U16CPU value)
41{
42	if (fValue != value)
43	{
44		if (fDoInterp)
45		{
46			if (fInterp)
47				delete fInterp;
48			fInterp = new SkInterpolator(1, 2);
49			SkScalar x = (SkScalar)(fValue << 8);
50			fInterp->setKeyFrame(0, SkTime::GetMSecs(), &x, 0);
51			x = (SkScalar)(value << 8);
52			fInterp->setKeyFrame(1, SkTime::GetMSecs() + 333, &x);
53		}
54		fValue = SkToU16(value);
55		this->inval(NULL);
56	}
57}
58
59void SkProgressView::onDraw(SkCanvas* canvas)
60{
61	if (fMax == 0)
62		return;
63
64	SkFixed	percent;
65
66	if (fInterp)
67	{
68		SkScalar x;
69		if (fInterp->timeToValues(SkTime::GetMSecs(), &x) == SkInterpolator::kFreezeEnd_Result)
70		{
71			delete fInterp;
72			fInterp = NULL;
73		}
74		percent = (SkFixed)x;	// now its 16.8
75		percent = SkMax32(0, SkMin32(percent, fMax << 8));	// now its pinned
76		percent = SkFixedDiv(percent, fMax << 8);	// now its 0.16
77		this->inval(NULL);
78	}
79	else
80	{
81		U16CPU value = SkMax32(0, SkMin32(fValue, fMax));
82		percent = SkFixedDiv(value, fMax);
83	}
84
85
86	SkRect	r;
87	SkPaint	p;
88
89	r.set(0, 0, this->width(), this->height());
90	p.setAntiAlias(true);
91
92	r.fRight = r.fLeft + SkScalarMul(r.width(), SkFixedToScalar(percent));
93	p.setStyle(SkPaint::kFill_Style);
94
95	p.setColor(SK_ColorDKGRAY);
96	p.setShader(fOnShader);
97	canvas->drawRect(r, p);
98
99	p.setColor(SK_ColorWHITE);
100	p.setShader(fOffShader);
101	r.fLeft = r.fRight;
102	r.fRight = this->width() - SK_Scalar1;
103	if (r.width() > 0)
104		canvas->drawRect(r, p);
105}
106
107#include "SkImageDecoder.h"
108
109static SkShader* inflate_shader(const char file[])
110{
111	SkBitmap	bm;
112
113	return SkImageDecoder::DecodeFile(file, &bm) ?
114			SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode) :
115			NULL;
116}
117
118void SkProgressView::onInflate(const SkDOM& dom, const SkDOM::Node* node)
119{
120	this->INHERITED::onInflate(dom, node);
121
122	const char* s;
123
124	SkASSERT(fOnShader == NULL);
125	SkASSERT(fOffShader == NULL);
126
127	if ((s = dom.findAttr(node, "src-on")) != NULL)
128		fOnShader = inflate_shader(s);
129	if ((s = dom.findAttr(node, "src-off")) != NULL)
130		fOffShader = inflate_shader(s);
131	(void)dom.findBool(node, "do-interp", &fDoInterp);
132}
133
134