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#ifdef SK_BUILD_FOR_WIN
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#ifdef SK_BUILD_FOR_WIN
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            SkString str("TextBox");
67            SampleCode::TitleR(evt, str.c_str());
68            return true;
69        }
70        return this->INHERITED::onQuery(evt);
71    }
72
73    void drawTest(SkCanvas* canvas, SkScalar w, SkScalar h, SkColor fg, SkColor bg) {
74        SkAutoCanvasRestore acr(canvas, true);
75
76        canvas->clipRect(SkRect::MakeWH(w, h));
77        canvas->drawColor(bg);
78		SkScalar margin = 20;
79        SkTextBox tbox;
80		tbox.setMode(SkTextBox::kLineBreak_Mode);
81		tbox.setBox(margin, margin,
82					w - margin, h - margin);
83		tbox.setSpacing(SkIntToScalar(3)/3, 0);
84
85		SkPaint paint;
86		paint.setAntiAlias(true);
87        paint.setLCDRenderText(true);
88        paint.setColor(fg);
89		tbox.setText(gText, strlen(gText), paint);
90
91		for (int i = 9; i < 24; i += 2) {
92			paint.setTextSize(SkIntToScalar(i));
93			tbox.draw(canvas);
94			canvas->translate(0, tbox.getTextHeight() + paint.getFontSpacing());
95		}
96    }
97
98    virtual void onDrawContent(SkCanvas* canvas) {
99        SkScalar width = this->width() / 3;
100        drawTest(canvas, width, this->height(), SK_ColorBLACK, SK_ColorWHITE);
101        canvas->translate(width, 0);
102        drawTest(canvas, width, this->height(), SK_ColorWHITE, SK_ColorBLACK);
103        canvas->translate(width, 0);
104        drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorWHITE);
105        canvas->translate(0, this->height()/2);
106        drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorBLACK);
107    }
108
109private:
110    typedef SampleView INHERITED;
111};
112
113//////////////////////////////////////////////////////////////////////////////
114
115static SkView* MyFactory() { return new TextBoxView; }
116static SkViewRegister reg(MyFactory);
117
118