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
28 extern void skia_set_text_gamma(float blackGamma, float whiteGamma);
29
30 #if defined(SK_BUILD_FOR_WIN) && defined(SK_FONTHOST_WIN_GDI)
31 extern SkTypeface* SkCreateTypefaceFromLOGFONT(const LOGFONT&);
32 #endif
33
34 static 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
42 class TextBoxView : public SampleView {
43 public:
TextBoxView()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
59 protected:
60 // overrides from SkEventSink
onQuery(SkEvent * evt)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
drawTest(SkCanvas * canvas,SkScalar w,SkScalar h,SkColor fg,SkColor bg)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
onDrawContent(SkCanvas * canvas)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
105 private:
106 typedef SampleView INHERITED;
107 };
108
109 //////////////////////////////////////////////////////////////////////////////
110
MyFactory()111 static SkView* MyFactory() { return new TextBoxView; }
112 static SkViewRegister reg(MyFactory);
113