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