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 "SkCanvas.h"
10 #include "SkTime.h"
11 #include "SkInterpolator.h"
12
13 extern bool is_overview(SkView* view);
14
15 static const char gIsTransitionQuery[] = "is-transition";
16 static const char gReplaceTransitionEvt[] = "replace-transition-view";
17
is_transition(SkView * view)18 bool is_transition(SkView* view) {
19 SkEvent isTransition(gIsTransitionQuery);
20 return view->doQuery(&isTransition);
21 }
22
23 class TransitionView : public SampleView {
24 public:
TransitionView(SkView * prev,SkView * next,int direction)25 TransitionView(SkView* prev, SkView* next, int direction) : fInterp(4, 2){
26 fAnimationDirection = (Direction)(1 << (direction % 8));
27
28 fPrev = prev;
29 fPrev->setClipToBounds(false);
30 fPrev->setVisibleP(true);
31 (void)SampleView::SetUsePipe(fPrev, false);
32 //Not calling unref because fPrev is assumed to have been created, so
33 //this will result in a transfer of ownership
34 this->attachChildToBack(fPrev);
35
36 fNext = next;
37 fNext->setClipToBounds(true);
38 fNext->setVisibleP(true);
39 (void)SampleView::SetUsePipe(fNext, false);
40 //Calling unref because next is a newly created view and TransitionView
41 //is now the sole owner of fNext
42 this->attachChildToFront(fNext)->unref();
43
44 fDone = false;
45 //SkDebugf("--created transition\n");
46 }
47
~TransitionView()48 ~TransitionView(){
49 //SkDebugf("--deleted transition\n");
50 }
51
requestMenu(SkOSMenu * menu)52 virtual void requestMenu(SkOSMenu* menu) {
53 if (SampleView::IsSampleView(fNext))
54 ((SampleView*)fNext)->requestMenu(menu);
55 }
56
57 protected:
onQuery(SkEvent * evt)58 virtual bool onQuery(SkEvent* evt) {
59 if (SampleCode::TitleQ(*evt)) {
60 SkString title;
61 if (SampleCode::RequestTitle(fNext, &title)) {
62 SampleCode::TitleR(evt, title.c_str());
63 return true;
64 }
65 return false;
66 }
67 if (evt->isType(gIsTransitionQuery)) {
68 return true;
69 }
70 return this->INHERITED::onQuery(evt);
71 }
onEvent(const SkEvent & evt)72 virtual bool onEvent(const SkEvent& evt) {
73 if (evt.isType(gReplaceTransitionEvt)) {
74 fPrev->detachFromParent();
75 fPrev = (SkView*)SkEventSink::FindSink(evt.getFast32());
76 (void)SampleView::SetUsePipe(fPrev, false);
77 //attach the new fPrev and call unref to balance the ref in onDraw
78 this->attachChildToBack(fPrev)->unref();
79 this->inval(NULL);
80 return true;
81 }
82 if (evt.isType("transition-done")) {
83 fNext->setLoc(0, 0);
84 fNext->setClipToBounds(false);
85 SkEvent* evt = new SkEvent(gReplaceTransitionEvt,
86 this->getParent()->getSinkID());
87 evt->setFast32(fNext->getSinkID());
88 //increate ref count of fNext so it survives detachAllChildren
89 fNext->ref();
90 this->detachAllChildren();
91 evt->post();
92 return true;
93 }
94 return this->INHERITED::onEvent(evt);
95 }
onDrawBackground(SkCanvas * canvas)96 virtual void onDrawBackground(SkCanvas* canvas) {}
onDrawContent(SkCanvas * canvas)97 virtual void onDrawContent(SkCanvas* canvas) {
98 if (fDone)
99 return;
100
101 if (is_overview(fNext) || is_overview(fPrev)) {
102 fUsePipe = false;
103 }
104
105 SkScalar values[4];
106 SkInterpolator::Result result = fInterp.timeToValues(SkTime::GetMSecs(), values);
107 //SkDebugf("transition %x %d pipe:%d\n", this, result, fUsePipe);
108 //SkDebugf("%f %f %f %f %d\n", values[0], values[1], values[2], values[3], result);
109 if (SkInterpolator::kNormal_Result == result) {
110 fPrev->setLocX(values[kPrevX]);
111 fPrev->setLocY(values[kPrevY]);
112 fNext->setLocX(values[kNextX]);
113 fNext->setLocY(values[kNextY]);
114 this->inval(NULL);
115 }
116 else {
117 (new SkEvent("transition-done", this->getSinkID()))->post();
118 fDone = true;
119 }
120 }
121
onSizeChange()122 virtual void onSizeChange() {
123 this->INHERITED::onSizeChange();
124
125 fNext->setSize(this->width(), this->height());
126 fPrev->setSize(this->width(), this->height());
127
128 SkScalar lr = 0, ud = 0;
129 if (fAnimationDirection & (kLeftDirection|kULDirection|kDLDirection))
130 lr = this->width();
131 if (fAnimationDirection & (kRightDirection|kURDirection|kDRDirection))
132 lr = -this->width();
133 if (fAnimationDirection & (kUpDirection|kULDirection|kURDirection))
134 ud = this->height();
135 if (fAnimationDirection & (kDownDirection|kDLDirection|kDRDirection))
136 ud = -this->height();
137
138 fBegin[kPrevX] = fBegin[kPrevY] = 0;
139 fBegin[kNextX] = lr;
140 fBegin[kNextY] = ud;
141 fNext->setLocX(lr);
142 fNext->setLocY(ud);
143
144 if (is_transition(fPrev))
145 lr = ud = 0;
146 fEnd[kPrevX] = -lr;
147 fEnd[kPrevY] = -ud;
148 fEnd[kNextX] = fEnd[kNextY] = 0;
149 SkScalar blend[] = {0.8, 0.0, 0.0, 1.0};
150 fInterp.setKeyFrame(0, SkTime::GetMSecs(), fBegin, blend);
151 fInterp.setKeyFrame(1, SkTime::GetMSecs()+500, fEnd, blend);
152 }
153
154 private:
155 enum {
156 kPrevX = 0,
157 kPrevY = 1,
158 kNextX = 2,
159 kNextY = 3
160 };
161 SkView* fPrev;
162 SkView* fNext;
163 bool fDone;
164 SkInterpolator fInterp;
165
166 enum Direction{
167 kUpDirection = 1,
168 kURDirection = 1 << 1,
169 kRightDirection = 1 << 2,
170 kDRDirection = 1 << 3,
171 kDownDirection = 1 << 4,
172 kDLDirection = 1 << 5,
173 kLeftDirection = 1 << 6,
174 kULDirection = 1 << 7
175 };
176
177 Direction fAnimationDirection;
178 SkScalar fBegin[4];
179 SkScalar fEnd[4];
180
181 typedef SampleView INHERITED;
182 };
183
create_transition(SkView * prev,SkView * next,int direction)184 SkView* create_transition(SkView* prev, SkView* next, int direction) {
185 return SkNEW_ARGS(TransitionView, (prev, next, direction));
186 };