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/GrDirectContext.h"
14 #else
15 class GrDirectContext;
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 context doesn't combine GrDrawOps across draw loops.
53 if (auto direct = GrAsDirectContext(canvas->recordingContext())) {
54 direct->flushAndSubmit();
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 auto dispatch = [this](Click* c) {
66 return c->fHasFunc ? c->fFunc(c) : this->onClick(c);
67 };
68
69 switch (clickState) {
70 case skui::InputState::kDown:
71 fClick = nullptr;
72 fClick.reset(this->onFindClickHandler(point.x(), point.y(), modifierKeys));
73 if (!fClick) {
74 return false;
75 }
76 fClick->fPrev = fClick->fCurr = fClick->fOrig = point;
77 fClick->fState = skui::InputState::kDown;
78 fClick->fModifierKeys = modifierKeys;
79 dispatch(fClick.get());
80 return true;
81 case skui::InputState::kMove:
82 if (fClick) {
83 fClick->fPrev = fClick->fCurr;
84 fClick->fCurr = point;
85 fClick->fState = skui::InputState::kMove;
86 fClick->fModifierKeys = modifierKeys;
87 return dispatch(fClick.get());
88 }
89 return false;
90 case skui::InputState::kUp:
91 if (fClick) {
92 fClick->fPrev = fClick->fCurr;
93 fClick->fCurr = point;
94 fClick->fState = skui::InputState::kUp;
95 fClick->fModifierKeys = modifierKeys;
96 bool result = dispatch(fClick.get());
97 fClick = nullptr;
98 return result;
99 }
100 return false;
101 default:
102 // Ignore other cases
103 SkASSERT(false);
104 break;
105 }
106 SkASSERT(false);
107 return false;
108 }
109
110 //////////////////////////////////////////////////////////////////////
111
onSizeChange()112 void Sample::onSizeChange() {}
113
onFindClickHandler(SkScalar x,SkScalar y,skui::ModifierKey modi)114 Sample::Click* Sample::onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey modi) {
115 return nullptr;
116 }
117
onClick(Click *)118 bool Sample::onClick(Click*) {
119 return false;
120 }
121
onDrawBackground(SkCanvas * canvas)122 void Sample::onDrawBackground(SkCanvas* canvas) {
123 canvas->drawColor(fBGColor);
124 }
125
126 // need to explicitly declare this, or we get some weird infinite loop llist
127 template SampleRegistry* SampleRegistry::gHead;
128