1 /*
2 * Copyright 2016 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
8 #include "include/core/SkCanvas.h"
9 #include "include/core/SkString.h"
10 #include "samplecode/Sample.h"
11
12 #if SK_SUPPORT_GPU
13 # include "include/gpu/GrContext.h"
14 #else
15 class GrContext;
16 #endif
17
18 //////////////////////////////////////////////////////////////////////////////
19
setSize(SkScalar width,SkScalar height)20 void Sample::setSize(SkScalar width, SkScalar height) {
21 width = SkMaxScalar(0, width);
22 height = SkMaxScalar(0, height);
23
24 if (fWidth != width || fHeight != height)
25 {
26 fWidth = width;
27 fHeight = height;
28 this->onSizeChange();
29 }
30 }
31
draw(SkCanvas * canvas)32 void Sample::draw(SkCanvas* canvas) {
33 if (fWidth && fHeight) {
34 SkRect r;
35 r.set(0, 0, fWidth, fHeight);
36 if (canvas->quickReject(r)) {
37 return;
38 }
39
40 SkAutoCanvasRestore as(canvas, true);
41 int sc = canvas->save();
42
43 if (!fHaveCalledOnceBeforeDraw) {
44 fHaveCalledOnceBeforeDraw = true;
45 this->onOnceBeforeDraw();
46 }
47 this->onDrawBackground(canvas);
48
49 SkAutoCanvasRestore acr(canvas, true);
50 this->onDrawContent(canvas);
51 #if SK_SUPPORT_GPU
52 // Ensure the GrContext doesn't combine GrDrawOps across draw loops.
53 if (GrContext* context = canvas->getGrContext()) {
54 context->flush();
55 }
56 #endif
57
58 canvas->restoreToCount(sc);
59 }
60 }
61
62 ////////////////////////////////////////////////////////////////////////////
63
mouse(SkPoint point,InputState clickState,ModifierKey modifierKeys)64 bool Sample::mouse(SkPoint point, InputState clickState, ModifierKey modifierKeys) {
65 switch (clickState) {
66 case InputState::kDown:
67 fClick = nullptr;
68 if (point.x() < 0 || point.y() < 0 || point.x() >= fWidth || point.y() >= fHeight) {
69 return false;
70 }
71 fClick.reset(this->onFindClickHandler(point.x(), point.y(), modifierKeys));
72 if (!fClick) {
73 return false;
74 }
75 fClick->fPrev = fClick->fCurr = fClick->fOrig = point;
76 fClick->fState = InputState::kDown;
77 fClick->fModifierKeys = modifierKeys;
78 this->onClick(fClick.get());
79 return true;
80 case InputState::kMove:
81 if (fClick) {
82 fClick->fPrev = fClick->fCurr;
83 fClick->fCurr = point;
84 fClick->fState = InputState::kMove;
85 fClick->fModifierKeys = modifierKeys;
86 return this->onClick(fClick.get());
87 }
88 return false;
89 case InputState::kUp:
90 if (fClick) {
91 fClick->fPrev = fClick->fCurr;
92 fClick->fCurr = point;
93 fClick->fState = InputState::kUp;
94 fClick->fModifierKeys = modifierKeys;
95 bool result = this->onClick(fClick.get());
96 fClick = nullptr;
97 return result;
98 }
99 return false;
100 }
101 SkASSERT(false);
102 return false;
103 }
104
105 //////////////////////////////////////////////////////////////////////
106
onSizeChange()107 void Sample::onSizeChange() {}
108
onFindClickHandler(SkScalar x,SkScalar y,ModifierKey modi)109 Sample::Click* Sample::onFindClickHandler(SkScalar x, SkScalar y, ModifierKey modi) {
110 return nullptr;
111 }
112
onClick(Click *)113 bool Sample::onClick(Click*) {
114 return false;
115 }
116
onDrawBackground(SkCanvas * canvas)117 void Sample::onDrawBackground(SkCanvas* canvas) {
118 canvas->drawColor(fBGColor);
119 }
120
121 // need to explicitly declare this, or we get some weird infinite loop llist
122 template SampleRegistry* SampleRegistry::gHead;
123