Bug 728614 - Part 0: Allow querying the viewport information from Java; r=dougt

mobile/android/base/GeckoApp.java

@@ -1302,6 +1302,16 @@ abstract public class GeckoApp
             Runnable r = new SessionSnapshotRunnable(tab);
             GeckoAppShell.getHandler().postDelayed(r, 500);
         }
+
+        GeckoAppShell.sendEventToGecko(
+            GeckoEvent.createMetaViewportQueryEvent(tab.getId(),
+                new GeckoEvent.Callback() {
+                    public void callback(GeckoEvent ev, String data) {
+                        Log.i(LOGTAG, "Meta Viewport Data:" + data);
+                        // To do: do something with this data
+                    } 
+                })
+            );
     }
 
     void handleShowToast(final String message, final String duration) {

mobile/android/base/GeckoEvent.java

@@ -62,6 +62,10 @@ import android.util.Log;
  */
 
 public class GeckoEvent {
+    public interface Callback {
+        public void callback(GeckoEvent event, String jsonData);
+    }
+
     private static final String LOGTAG = "GeckoEvent";
 
     private static final int INVALID = -1;
@@ -89,6 +93,7 @@ public class GeckoEvent {
     private static final int PROXIMITY_EVENT = 23;
     private static final int ACTIVITY_RESUMING = 24;
     private static final int SCREENSHOT = 25;
+    private static final int META_VIEWPORT_QUERY = 26;
 
     public static final int IME_COMPOSITION_END = 0;
     public static final int IME_COMPOSITION_BEGIN = 1;
@@ -136,6 +141,9 @@ public class GeckoEvent {
     public boolean mCanBeMetered;
 
     public int mNativeWindow;
+    public int mTabId;
+
+    Callback mCallback;
 
     private GeckoEvent(int evType) {
         mType = evType;
@@ -382,6 +390,14 @@ public class GeckoEvent {
         return event;
     }
 
+    public static GeckoEvent createMetaViewportQueryEvent(int tabId, Callback callback) {
+        Log.i("GeckoEvent", "createMetaViewportQueryEvent");
+        GeckoEvent event = new GeckoEvent(META_VIEWPORT_QUERY);
+        event.mCallback = callback;
+        event.mTabId = tabId;
+        return event;
+    }
+
     public static GeckoEvent createLoadEvent(String uri) {
         GeckoEvent event = new GeckoEvent(LOAD_URI);
         event.mCharacters = uri;
@@ -409,4 +425,10 @@ public class GeckoEvent {
         event.mMetaState = tabId;
         return event;
     }
+
+    public void doCallback(String jsonData) {
+        if (mCallback != null) {
+            mCallback.callback(this, jsonData);
+        }
+    }
 }

widget/android/AndroidJavaWrappers.cpp

@@ -76,6 +76,8 @@ jfieldID AndroidGeckoEvent::jLocationField = 0;
 jfieldID AndroidGeckoEvent::jAddressField = 0;
 jfieldID AndroidGeckoEvent::jBandwidthField = 0;
 jfieldID AndroidGeckoEvent::jCanBeMeteredField = 0;
+jfieldID AndroidGeckoEvent::jTabIdField = 0;
+jmethodID AndroidGeckoEvent::jDoCallbackMethod = 0;
 
 jclass AndroidPoint::jPointClass = 0;
 jfieldID AndroidPoint::jXField = 0;
@@ -208,6 +210,9 @@ AndroidGeckoEvent::InitGeckoEventClass(JNIEnv *jEnv)
     jAddressField = getField("mAddress", "Landroid/location/Address;");
     jBandwidthField = getField("mBandwidth", "D");
     jCanBeMeteredField = getField("mCanBeMetered", "Z");
+
+    jTabIdField = getField("mTabId", "I");
+    jDoCallbackMethod = getMethod("doCallback", "(Ljava/lang/String;)V");
 }
 
 void
@@ -585,6 +590,10 @@ AndroidGeckoEvent::Init(JNIEnv *jenv, jobject jobj)
             break;
         }
 
+        case META_VIEWPORT_QUERY:
+            mTabId = jenv->GetIntField(jobj, jTabIdField);
+            break;
+
         case VIEWPORT:
         case BROADCAST: {
             ReadCharactersField(jenv);
@@ -665,6 +674,16 @@ AndroidPoint::Init(JNIEnv *jenv, jobject jobj)
     }
 }
 
+void
+AndroidGeckoEvent::DoCallback(const nsAString& data) {
+    JNIEnv* env = AndroidBridge::GetJNIEnv();
+    if (!env)
+        return;
+    AndroidBridge::AutoLocalJNIFrame(env, 1);
+    jstring jData = env->NewString(nsPromiseFlatString(data).get(), data.Length());
+    env->CallVoidMethod(wrapped_obj, jDoCallbackMethod, jData);
+}
+
 void
 AndroidGeckoGLLayerClient::Init(jobject jobj)
 {

widget/android/AndroidJavaWrappers.h

@@ -546,6 +546,8 @@ public:
     nsGeoPositionAddress* GeoAddress() { return mGeoAddress; }
     double Bandwidth() { return mBandwidth; }
     bool CanBeMetered() { return mCanBeMetered; }
+    int TabId() { return mTabId; }
+    void DoCallback(const nsAString& data);
 
 protected:
     int mAction;
@@ -571,6 +573,7 @@ protected:
     nsRefPtr<nsGeoPositionAddress> mGeoAddress;
     double mBandwidth;
     bool mCanBeMetered;
+    int mTabId;
 
     void ReadIntArray(nsTArray<int> &aVals,
                       JNIEnv *jenv,
@@ -625,6 +628,9 @@ protected:
 
     static jfieldID jBandwidthField;
     static jfieldID jCanBeMeteredField;
+    static jfieldID jTabIdField;
+    
+    static jmethodID jDoCallbackMethod;
 
 public:
     enum {
@@ -653,6 +659,7 @@ public:
         PROXIMITY_EVENT = 23,
         ACTIVITY_RESUMING = 24,
         SCREENSHOT = 25,
+        META_VIEWPORT_QUERY = 26,
         dummy_java_enum_list_end
     };
 

widget/android/nsAppShell.cpp

@@ -60,7 +60,7 @@
 #include <android/log.h>
 #include <pthread.h>
 #include <wchar.h>
-
+#include "nsContentUtils.h"
 #ifdef MOZ_ANDROID_HISTORY
 #include "nsAndroidHistory.h"
 #endif
@@ -453,6 +453,34 @@ nsAppShell::ProcessNextNativeEvent(bool mayWait)
         break;
     }
 
+
+    case AndroidGeckoEvent::META_VIEWPORT_QUERY:
+    {
+        nsCOMPtr<nsIDOMWindow> domWindow;
+        mBrowserApp->GetWindowForTab(curEvent->TabId(), getter_AddRefs(domWindow));
+        if (!domWindow)
+            break;
+        nsCOMPtr<nsIDOMDocument> domDocument;
+        domWindow->GetDocument(getter_AddRefs(domDocument));
+        nsCOMPtr<nsIDocument> doc = do_QueryInterface(domDocument);
+        if (!doc)
+            break;
+        ViewportInfo vi = nsContentUtils::GetViewportInfo(doc);
+        nsAutoString data;
+        data.AppendLiteral("{");
+        data.AppendPrintf("\"defaultZoom\": %f,", vi.defaultZoom);
+        data.AppendPrintf("\"minZoom\": %f,", vi.minZoom);
+        data.AppendPrintf("\"maxZoom\": %f,", vi.maxZoom);
+        data.AppendPrintf("\"width\": %d,", vi.width);
+        data.AppendPrintf("\"height\": %d,", vi.height);
+        data.AppendPrintf("\"autoSize\": %s,", vi.autoSize ? "true" : "false");
+        data.AppendPrintf("\"allowZoom\": %s,", vi.allowZoom ? "true" : "false");
+        data.AppendPrintf("\"autoScale\": %s", vi.autoScale ? "true" : "false");
+        data.AppendLiteral("}");
+
+        curEvent->DoCallback(data);
+    }
+        break;
     case AndroidGeckoEvent::VIEWPORT:
     case AndroidGeckoEvent::BROADCAST: {