Add GM/slide to simulate Android-style reveal clip

samplecode/GMSampleView.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GMSampleView.h"
 
 GMSampleView::GMSampleView(GM* gm) : fShowSize(false), fGM(gm) {}
 
 GMSampleView::~GMSampleView() {
     delete fGM;
 }
 
 SkEvent* GMSampleView::NewShowSizeEvt(bool doShowSize) {
     SkEvent* evt = new SkEvent("GMSampleView::showSize");
     evt->setFast32(doShowSize);
     return evt;
 }
 
 bool GMSampleView::onQuery(SkEvent* evt) {
     if (SampleCode::TitleQ(*evt)) {
         SkString name("GM:");
         name.append(fGM->getName());
         SampleCode::TitleR(evt, name.c_str());
         return true;
     }
+
+    SkUnichar uni;
+    if (SampleCode::CharQ(*evt, &uni)) {
+        if (fGM->handleKey(uni)) {
+            this->inval(nullptr);
+            return true;
+        }
+    }
+
     return this->INHERITED::onQuery(evt);
 }
 
 bool GMSampleView::onEvent(const SkEvent& evt) {
     if (evt.isType("GMSampleView::showSize")) {
         fShowSize = SkToBool(evt.getFast32());
         return true;
     }
     return this->INHERITED::onEvent(evt);
 }
@@ skipping 41 matching lines @@
     }
 }
 
 void GMSampleView::onDrawBackground(SkCanvas* canvas) {
     fGM->drawBackground(canvas);
 }
 
 bool GMSampleView::onAnimate(const SkAnimTimer& timer) {
     return fGM->animate(timer);
 }