1/*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7#include "SampleCode.h"
8#include "SkView.h"
9#include "SkBlurMaskFilter.h"
10#include "SkCanvas.h"
11#include "SkColorShader.h"
12#include "SkGradientShader.h"
13#include "SkGraphics.h"
14#include "SkPath.h"
15#include "SkRandom.h"
16#include "SkRegion.h"
17#include "SkShader.h"
18#include "SkUtils.h"
19#include "SkColorPriv.h"
20#include "SkColorFilter.h"
21#include "SkTime.h"
22#include "SkTypeface.h"
23#include "SkTextBox.h"
24#include "SkOSFile.h"
25#include "SkStream.h"
26#include "SkKey.h"
27
28extern void skia_set_text_gamma(float blackGamma, float whiteGamma);
29
30#if defined(SK_BUILD_FOR_WIN) && defined(SK_FONTHOST_WIN_GDI)
31extern SkTypeface* SkCreateTypefaceFromLOGFONT(const LOGFONT&);
32#endif
33
34static const char gText[] =
35    "When in the Course of human events it becomes necessary for one people "
36    "to dissolve the political bands which have connected them with another "
37    "and to assume among the powers of the earth, the separate and equal "
38    "station to which the Laws of Nature and of Nature's God entitle them, "
39    "a decent respect to the opinions of mankind requires that they should "
40    "declare the causes which impel them to the separation.";
41
42class TextBoxView : public SampleView {
43public:
44    TextBoxView() {
45#if defined(SK_BUILD_FOR_WIN) && defined(SK_FONTHOST_WIN_GDI)
46        LOGFONT lf;
47        sk_bzero(&lf, sizeof(lf));
48        lf.lfHeight = 9;
49        SkTypeface* tf0 = SkCreateTypefaceFromLOGFONT(lf);
50        lf.lfHeight = 12;
51        SkTypeface* tf1 = SkCreateTypefaceFromLOGFONT(lf);
52        // we assert that different sizes should not affect which face we get
53        SkASSERT(tf0 == tf1);
54        tf0->unref();
55        tf1->unref();
56#endif
57    }
58
59protected:
60    // overrides from SkEventSink
61    virtual bool onQuery(SkEvent* evt)  {
62        if (SampleCode::TitleQ(*evt)) {
63            SampleCode::TitleR(evt, "TextBox");
64            return true;
65        }
66        return this->INHERITED::onQuery(evt);
67    }
68
69    void drawTest(SkCanvas* canvas, SkScalar w, SkScalar h, SkColor fg, SkColor bg) {
70        SkAutoCanvasRestore acr(canvas, true);
71
72        canvas->clipRect(SkRect::MakeWH(w, h));
73        canvas->drawColor(bg);
74        SkScalar margin = 20;
75        SkTextBox tbox;
76        tbox.setMode(SkTextBox::kLineBreak_Mode);
77        tbox.setBox(margin, margin,
78                    w - margin, h - margin);
79        tbox.setSpacing(SkIntToScalar(3)/3, 0);
80
81        SkPaint paint;
82        paint.setAntiAlias(true);
83        paint.setLCDRenderText(true);
84        paint.setColor(fg);
85        tbox.setText(gText, strlen(gText), paint);
86
87        for (int i = 9; i < 24; i += 2) {
88            paint.setTextSize(SkIntToScalar(i));
89            tbox.draw(canvas);
90            canvas->translate(0, tbox.getTextHeight() + paint.getFontSpacing());
91        }
92    }
93
94    virtual void onDrawContent(SkCanvas* canvas) {
95        SkScalar width = this->width() / 3;
96        drawTest(canvas, width, this->height(), SK_ColorBLACK, SK_ColorWHITE);
97        canvas->translate(width, 0);
98        drawTest(canvas, width, this->height(), SK_ColorWHITE, SK_ColorBLACK);
99        canvas->translate(width, 0);
100        drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorWHITE);
101        canvas->translate(0, this->height()/2);
102        drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorBLACK);
103    }
104
105private:
106    typedef SampleView INHERITED;
107};
108
109//////////////////////////////////////////////////////////////////////////////
110
111static SkView* MyFactory() { return new TextBoxView; }
112static SkViewRegister reg(MyFactory);
113