SkProgressView.cpp revision d686ac77c2c485c4a3302eda9c1de597a6f8c568 
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