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 "SampleCode.h"
9#include "SkView.h"
10#include "SkBlurMaskFilter.h"
11#include "SkCanvas.h"
12#include "SkColorShader.h"
13#include "SkGradientShader.h"
14#include "SkGraphics.h"
15#include "SkImageDecoder.h"
16#include "SkPath.h"
17#include "SkRandom.h"
18#include "SkRegion.h"
19#include "SkShader.h"
20#include "SkUtils.h"
21#include "SkXfermode.h"
22#include "SkColorPriv.h"
23#include "SkColorFilter.h"
24#include "SkTime.h"
25#include "SkTypeface.h"
26#include "SkTextBox.h"
27#include "SkOSFile.h"
28#include "SkStream.h"
29#include "SkKey.h"
30
31extern void skia_set_text_gamma(float blackGamma, float whiteGamma);
32
33#if defined(SK_BUILD_FOR_WIN) && defined(SK_FONTHOST_WIN_GDI)
34extern SkTypeface* SkCreateTypefaceFromLOGFONT(const LOGFONT&);
35#endif
36
37static const char gText[] =
38    "When in the Course of human events it becomes necessary for one people "
39    "to dissolve the political bands which have connected them with another "
40    "and to assume among the powers of the earth, the separate and equal "
41    "station to which the Laws of Nature and of Nature's God entitle them, "
42    "a decent respect to the opinions of mankind requires that they should "
43    "declare the causes which impel them to the separation.";
44
45class TextBoxView : public SampleView {
46public:
47    TextBoxView() {
48#if defined(SK_BUILD_FOR_WIN) && defined(SK_FONTHOST_WIN_GDI)
49        LOGFONT lf;
50        sk_bzero(&lf, sizeof(lf));
51        lf.lfHeight = 9;
52        SkTypeface* tf0 = SkCreateTypefaceFromLOGFONT(lf);
53        lf.lfHeight = 12;
54        SkTypeface* tf1 = SkCreateTypefaceFromLOGFONT(lf);
55        // we assert that different sizes should not affect which face we get
56        SkASSERT(tf0 == tf1);
57        tf0->unref();
58        tf1->unref();
59#endif
60    }
61
62protected:
63    // overrides from SkEventSink
64    virtual bool onQuery(SkEvent* evt)  {
65        if (SampleCode::TitleQ(*evt)) {
66            SampleCode::TitleR(evt, "TextBox");
67            return true;
68        }
69        return this->INHERITED::onQuery(evt);
70    }
71
72    void drawTest(SkCanvas* canvas, SkScalar w, SkScalar h, SkColor fg, SkColor bg) {
73        SkAutoCanvasRestore acr(canvas, true);
74
75        canvas->clipRect(SkRect::MakeWH(w, h));
76        canvas->drawColor(bg);
77        SkScalar margin = 20;
78        SkTextBox tbox;
79        tbox.setMode(SkTextBox::kLineBreak_Mode);
80        tbox.setBox(margin, margin,
81                    w - margin, h - margin);
82        tbox.setSpacing(SkIntToScalar(3)/3, 0);
83
84        SkPaint paint;
85        paint.setAntiAlias(true);
86        paint.setLCDRenderText(true);
87        paint.setColor(fg);
88        tbox.setText(gText, strlen(gText), paint);
89
90        for (int i = 9; i < 24; i += 2) {
91            paint.setTextSize(SkIntToScalar(i));
92            tbox.draw(canvas);
93            canvas->translate(0, tbox.getTextHeight() + paint.getFontSpacing());
94        }
95    }
96
97    virtual void onDrawContent(SkCanvas* canvas) {
98        SkScalar width = this->width() / 3;
99        drawTest(canvas, width, this->height(), SK_ColorBLACK, SK_ColorWHITE);
100        canvas->translate(width, 0);
101        drawTest(canvas, width, this->height(), SK_ColorWHITE, SK_ColorBLACK);
102        canvas->translate(width, 0);
103        drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorWHITE);
104        canvas->translate(0, this->height()/2);
105        drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorBLACK);
106    }
107
108private:
109    typedef SampleView INHERITED;
110};
111
112//////////////////////////////////////////////////////////////////////////////
113
114static SkView* MyFactory() { return new TextBoxView; }
115static SkViewRegister reg(MyFactory);
116