Use swipe gesture to switch between slides on Android

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1965013007

Review-Url: https://codereview.chromium.org/1965013007

5 files changed, 40 insertions, 6 deletions

diff --git a/tools/viewer/sk_app/Window.h b/tools/viewer/sk_app/Window.h
index 5a7c9b8360..f233f131a5 100644
--- a/tools/viewer/sk_app/Window.h
+++ b/tools/viewer/sk_app/Window.h
@@ -130,7 +130,7 @@ public:
     uint32_t width() { return fWidth; }
     uint32_t height() { return fHeight;  }
 
-    const DisplayParams& getDisplayParams();
+    virtual const DisplayParams& getDisplayParams();
     void setDisplayParams(const DisplayParams& params);
 
 protected:
diff --git a/tools/viewer/sk_app/android/Window_android.cpp b/tools/viewer/sk_app/android/Window_android.cpp
index 09e7ef14a7..0156ea123e 100644
--- a/tools/viewer/sk_app/android/Window_android.cpp
+++ b/tools/viewer/sk_app/android/Window_android.cpp
@@ -27,6 +27,16 @@ bool Window_android::init(SkiaAndroidApp* skiaAndroidApp) {
     return true;
 }
 
+const DisplayParams& Window_android::getDisplayParams() {
+    if (fWindowContext) {
+        return fWindowContext->getDisplayParams();
+    } else {
+        // fWindowContext doesn't exist because we haven't
+        // initDisplay yet.
+        return fDisplayParams;
+    }
+}
+
 void Window_android::setTitle(const char* title) {
     //todo
     SkDebugf("Title: %s", title);
@@ -49,11 +59,9 @@ void Window_android::initDisplay(ANativeWindow* window) {
     ContextPlatformData_android platformData;
     platformData.fNativeWindow = window;
     fWindowContext = VulkanWindowContext::Create((void*)&platformData, fDisplayParams);
-    fNativeWindowInitialized = true;
 }
 
 void Window_android::onDisplayDestroyed() {
-    fNativeWindowInitialized = false;
     detach();
 }
 
diff --git a/tools/viewer/sk_app/android/Window_android.h b/tools/viewer/sk_app/android/Window_android.h
index 45e5bbe744..2bf7bfeaba 100644
--- a/tools/viewer/sk_app/android/Window_android.h
+++ b/tools/viewer/sk_app/android/Window_android.h
@@ -22,6 +22,7 @@ public:
     void initDisplay(ANativeWindow* window);
     void onDisplayDestroyed();
 
+    const DisplayParams& getDisplayParams() override;
     void setTitle(const char*) override;
     void show() override {}
 
@@ -37,7 +38,6 @@ private:
     SkiaAndroidApp* fSkiaAndroidApp = nullptr;
     SkRect fContentRect;
     DisplayParams fDisplayParams;
-    bool fNativeWindowInitialized = false;
 };
 
 }   // namespace sk_app
diff --git a/tools/viewer/sk_app/android/surface_glue_android.cpp b/tools/viewer/sk_app/android/surface_glue_android.cpp
index b1d0029a10..acee839a30 100644
--- a/tools/viewer/sk_app/android/surface_glue_android.cpp
+++ b/tools/viewer/sk_app/android/surface_glue_android.cpp
@@ -11,7 +11,9 @@
 #include <pthread.h>
 #include <stdio.h>
 #include <unistd.h>
+#include <unordered_map>
 
+#include <android/keycodes.h>
 #include <android/looper.h>
 #include <android/native_window_jni.h>
 
@@ -24,6 +26,11 @@ namespace sk_app {
 
 static const int LOOPER_ID_MESSAGEPIPE = 1;
 
+static const std::unordered_map<int, Window::Key> ANDROID_TO_WINDOW_KEYMAP({
+    {AKEYCODE_SOFT_LEFT, Window::Key::kLeft},
+    {AKEYCODE_SOFT_RIGHT, Window::Key::kRight}
+});
+
 void* pthread_main(void* arg);
 
 SkiaAndroidApp::SkiaAndroidApp() {
@@ -90,7 +97,6 @@ static int message_callback(int fd, int events, void* data) {
                      message.fNativeWindow);
             int width = ANativeWindow_getWidth(skiaAndroidApp->fNativeWindow);
             int height = ANativeWindow_getHeight(skiaAndroidApp->fNativeWindow);
-            skiaAndroidApp->fWindow->onResize(width, height);
             auto window_android = (Window_android*)skiaAndroidApp->fWindow;
             window_android->setContentRect(0, 0, width, height);
             skiaAndroidApp->paintIfNeeded();
@@ -105,6 +111,14 @@ static int message_callback(int fd, int events, void* data) {
             }
             break;
         }
+        case kKeyPressed: {
+            auto it = ANDROID_TO_WINDOW_KEYMAP.find(message.keycode);
+            SkASSERT(it != ANDROID_TO_WINDOW_KEYMAP.end());
+            // No modifier is supported so far
+            skiaAndroidApp->fWindow->onKey(it->second, Window::kDown_InputState, 0);
+            skiaAndroidApp->fWindow->onKey(it->second, Window::kUp_InputState, 0);
+            break;
+        }
         default: {
             // do nothing
         }
@@ -171,4 +185,14 @@ extern "C" JNIEXPORT void JNICALL Java_org_skia_viewer_ViewerActivity_onSurfaceD
     skiaAndroidApp->postMessage(Message(kSurfaceDestroyed));
 }
 
+extern "C" JNIEXPORT void JNICALL Java_org_skia_viewer_ViewerActivity_onKeyPressed(JNIEnv* env,
+                                                                                   jobject activity,
+                                                                                   jlong handle,
+                                                                                   jint keycode) {
+    auto skiaAndroidApp = (SkiaAndroidApp*)handle;
+    Message message(kKeyPressed);
+    message.keycode = keycode;
+    skiaAndroidApp->postMessage(message);
+}
+
 }  // namespace sk_app
diff --git a/tools/viewer/sk_app/android/surface_glue_android.h b/tools/viewer/sk_app/android/surface_glue_android.h
index aefe46208d..296112258e 100644
--- a/tools/viewer/sk_app/android/surface_glue_android.h
+++ b/tools/viewer/sk_app/android/surface_glue_android.h
@@ -23,12 +23,14 @@ enum MessageType {
     kSurfaceChanged,
     kSurfaceDestroyed,
     kDestroyApp,
-    kContentInvalidated
+    kContentInvalidated,
+    kKeyPressed
 };
 
 struct Message {
     MessageType fType = kUndefined;
     ANativeWindow* fNativeWindow = nullptr;
+    int keycode = 0;
 
     Message() {}
     Message(MessageType t) : fType(t) {}