Bug 696319 - Scroll window as needed when soft keyboard is up [r=mfinkle]

Send an event to scroll to the focused input field when the
soft keyboard comes up. Ensure that this happens *after* the
viewport change event is sent to Gecko, so that Gecko actually
knows that browser viewport is smaller and doesn't just no-op
the scroll request.

mobile/android/base/GeckoAppShell.java

@@ -1572,4 +1572,10 @@ public class GeckoAppShell
 
         accessibilityManager.sendAccessibilityEvent(event);
     }
+
+    public static void viewSizeChanged() {
+        if (mInputConnection != null && mInputConnection.isIMEEnabled()) {
+            sendEventToGecko(new GeckoEvent("ScrollTo:FocusedInput", ""));
+        }
+    }
 }

mobile/android/base/GeckoInputConnection.java

@@ -911,6 +911,10 @@ public class GeckoInputConnection
         return false;
     }
 
+    public boolean isIMEEnabled() {
+        // make sure this picks up PASSWORD and PLUGIN states as well
+        return mIMEState != IME_STATE_DISABLED;
+    }
 
     public void notifyIME(int type, int state) {
 

mobile/android/base/gfx/GeckoSoftwareLayerClient.java

@@ -85,6 +85,7 @@ public class GeckoSoftwareLayerClient extends LayerClient implements GeckoEventL
     private static final long MIN_VIEWPORT_CHANGE_DELAY = 350L;
     private long mLastViewportChangeTime;
     private boolean mPendingViewportAdjust;
+    private boolean mViewportSizeChanged;
 
     public GeckoSoftwareLayerClient(Context context) {
         mContext = context;
@@ -227,6 +228,11 @@ public class GeckoSoftwareLayerClient extends LayerClient implements GeckoEventL
         render();
     }
 
+    @Override
+    public void viewportSizeChanged() {
+        mViewportSizeChanged = true;
+    }
+
     @Override
     public void render() {
         adjustViewportWithThrottling();
@@ -266,6 +272,10 @@ public class GeckoSoftwareLayerClient extends LayerClient implements GeckoEventL
 
         GeckoEvent event = new GeckoEvent("Viewport:Change", viewportMetrics.toJSON());
         GeckoAppShell.sendEventToGecko(event);
+        if (mViewportSizeChanged) {
+            mViewportSizeChanged = false;
+            GeckoAppShell.viewSizeChanged();
+        }
 
         mLastViewportChangeTime = System.currentTimeMillis();
     }

mobile/android/base/gfx/LayerClient.java

@@ -44,6 +44,7 @@ public abstract class LayerClient {
     private LayerController mLayerController;
 
     public abstract void geometryChanged();
+    public abstract void viewportSizeChanged();
     protected abstract void render();
 
     public LayerController getLayerController() { return mLayerController; }

mobile/android/base/gfx/LayerController.java

@@ -162,6 +162,9 @@ public class LayerController {
         mViewportMetrics.setSize(size);
         setForceRedraw();
 
+        if (mLayerClient != null)
+            mLayerClient.viewportSizeChanged();
+
         notifyLayerClientOfGeometryChange();
         mPanZoomController.geometryChanged(false);
         mView.requestRender();

mobile/android/base/gfx/PlaceholderLayerClient.java

@@ -142,6 +142,8 @@ public class PlaceholderLayerClient extends LayerClient {
     @Override
     public void geometryChanged() { /* no-op */ }
     @Override
+    public void viewportSizeChanged() { /* no-op */ }
+    @Override
     public void render() { /* no-op */ }
 
     @Override

mobile/android/chrome/content/browser.js

@@ -518,8 +518,10 @@ var BrowserApp = {
     if (!doc)
       return;
     let focused = doc.activeElement;
-    if ((focused instanceof HTMLInputElement && focused.mozIsTextField(false)) || (focused instanceof HTMLTextAreaElement))
+    if ((focused instanceof HTMLInputElement && focused.mozIsTextField(false)) || (focused instanceof HTMLTextAreaElement)) {
       focused.scrollIntoView(false);
+      BrowserApp.getTabForBrowser(aBrowser).sendViewportUpdate();
+    }
   },
 
   getDrawMetadata: function getDrawMetadata() {