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 = std::max(0.0f, width);
22 height = std::max(0.0f, 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.setLTRB(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,skui::InputState clickState,skui::ModifierKey modifierKeys)64 bool Sample::mouse(SkPoint point, skui::InputState clickState, skui::ModifierKey modifierKeys) {
65 switch (clickState) {
66 case skui::InputState::kDown:
67 fClick = nullptr;
68 fClick.reset(this->onFindClickHandler(point.x(), point.y(), modifierKeys));
69 if (!fClick) {
70 return false;
71 }
72 fClick->fPrev = fClick->fCurr = fClick->fOrig = point;
73 fClick->fState = skui::InputState::kDown;
74 fClick->fModifierKeys = modifierKeys;
75 this->onClick(fClick.get());
76 return true;
77 case skui::InputState::kMove:
78 if (fClick) {
79 fClick->fPrev = fClick->fCurr;
80 fClick->fCurr = point;
81 fClick->fState = skui::InputState::kMove;
82 fClick->fModifierKeys = modifierKeys;
83 return this->onClick(fClick.get());
84 }
85 return false;
86 case skui::InputState::kUp:
87 if (fClick) {
88 fClick->fPrev = fClick->fCurr;
89 fClick->fCurr = point;
90 fClick->fState = skui::InputState::kUp;
91 fClick->fModifierKeys = modifierKeys;
92 bool result = this->onClick(fClick.get());
93 fClick = nullptr;
94 return result;
95 }
96 return false;
97 default:
98 // Ignore other cases
99 SkASSERT(false);
100 break;
101 }
102 SkASSERT(false);
103 return false;
104 }
105
106 //////////////////////////////////////////////////////////////////////
107
onSizeChange()108 void Sample::onSizeChange() {}
109
onFindClickHandler(SkScalar x,SkScalar y,skui::ModifierKey modi)110 Sample::Click* Sample::onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey modi) {
111 return nullptr;
112 }
113
onClick(Click *)114 bool Sample::onClick(Click*) {
115 return false;
116 }
117
onDrawBackground(SkCanvas * canvas)118 void Sample::onDrawBackground(SkCanvas* canvas) {
119 canvas->drawColor(fBGColor);
120 }
121
122 // need to explicitly declare this, or we get some weird infinite loop llist
123 template SampleRegistry* SampleRegistry::gHead;
124