allow GMs to animate

samplecode/SampleHT.cpp

Index: samplecode/SampleHT.cpp
diff --git a/samplecode/SampleHT.cpp b/samplecode/SampleHT.cpp
index c6e2b4971a4f8a529ae8078197d4719855c2513d..07605fe1ed65dd0cb8c1f18a3abf4dba9895fefc 100644
--- a/samplecode/SampleHT.cpp
+++ b/samplecode/SampleHT.cpp
@@ -46,6 +46,7 @@ class HTDrawable : public SkCanvasDrawable {
     SkRect          fR;
     SkColor         fColor;
     SkInterpolator* fInterp;
+    SkMSec          fTime;
 
 public:
     HTDrawable(SkRandom& rand) {
@@ -53,18 +54,21 @@ public:
                               rand.nextRangeF(20, 200), rand.nextRangeF(20, 200));
         fColor = rand_opaque_color(rand.nextU());
         fInterp = NULL;
+        fTime = 0;
     }
     
-    void spawnAnimation() {
+    void spawnAnimation(SkMSec now) {
+        this->setTime(now);
+
         SkDELETE(fInterp);
         fInterp = SkNEW_ARGS(SkInterpolator, (5, 3));
         SkScalar values[5];
         color_to_floats(fColor, values); values[4] = 0;
-        fInterp->setKeyFrame(0, SampleCode::GetAnimTime(), values);
+        fInterp->setKeyFrame(0, now, values);
         values[0] = 0; values[4] = 180;
-        fInterp->setKeyFrame(1, SampleCode::GetAnimTime() + 1000, values);
+        fInterp->setKeyFrame(1, now + 1000, values);
         color_to_floats(rand_opaque_color(fColor), values); values[4] = 360;
-        fInterp->setKeyFrame(2, SampleCode::GetAnimTime() + 2000, values);
+        fInterp->setKeyFrame(2, now + 2000, values);
 
         fInterp->setMirror(true);
         fInterp->setRepeatCount(3);
@@ -76,6 +80,8 @@ public:
         return oval_contains(fR, x, y);
     }
 
+    void setTime(SkMSec time) { fTime = time; }
+
     void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         SkAutoCanvasRestore acr(canvas, false);
 
@@ -84,7 +90,7 @@ public:
 
         if (fInterp) {
             SkScalar values[5];
-            SkInterpolator::Result res = fInterp->timeToValues(SampleCode::GetAnimTime(), values);
+            SkInterpolator::Result res = fInterp->timeToValues(fTime, values);
             fColor = floats_to_color(values);
 
             canvas->save();
@@ -104,7 +110,7 @@ public:
         paint.setColor(fColor);
         canvas->drawRect(fR, paint);
     }
-    
+
     SkRect onGetBounds() SK_OVERRIDE { return fR; }
 };
 
@@ -121,6 +127,7 @@ public:
     };
     Rec fArray[N];
     SkAutoTUnref<SkCanvasDrawable> fRoot;
+    SkMSec fTime;
     
     HTView() {
         SkRandom rand;
@@ -146,14 +153,21 @@ protected:
 
     void onDrawContent(SkCanvas* canvas) SK_OVERRIDE {
         canvas->EXPERIMENTAL_drawDrawable(fRoot);
-        this->inval(NULL);
+    }
+
+    bool onAnimatePulse(SkMSec curr, SkMSec prev) SK_OVERRIDE {
+        fTime = curr;
+        for (int i = 0; i < N; ++i) {
+            fArray[i].fDrawable->setTime(fTime);
+        }
+        return true;
     }
 
     SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) SK_OVERRIDE {
         // search backwards to find the top-most
         for (int i = N - 1; i >= 0; --i) {
             if (fArray[i].fDrawable->hitTest(x, y)) {
-                fArray[i].fDrawable->spawnAnimation();
+                fArray[i].fDrawable->spawnAnimation(fTime);
                 break;
             }
         }