Bug 895581 Double tap should zoom content instead of selecting text.r=mbrubeck

browser/metro/base/content/contenthandlers/Content.js

@@ -114,6 +114,7 @@ function getOverflowContentBoundingRect(aElement) {
  */
 let Content = {
   _debugEvents: false,
+  _isZoomedIn: false,
 
   get formAssistant() {
     delete this.formAssistant;
@@ -133,6 +134,7 @@ let Content = {
 
     addEventListener("touchstart", this, false);
     addEventListener("click", this, true);
+    addEventListener("dblclick", this, true);
     addEventListener("keydown", this);
     addEventListener("keyup", this);
 
@@ -180,6 +182,15 @@ let Content = {
           this.formAssistant.open(aEvent.target, aEvent);
         break;
 
+      case "dblclick":
+        // XXX Once gesture listners are used(Bug 933236), apzc will notify us
+        if (aEvent.mozInputSource == Ci.nsIDOMMouseEvent.MOZ_SOURCE_TOUCH) {
+          let selection = content.getSelection();
+          selection.removeAllRanges();
+          this._onZoomToTappedContent(aEvent.target);
+        }
+        break;
+
       case "click":
         // Workaround for bug 925457: we sometimes don't recognize the
         // correct tap target or are unable to identify if it's editable.
@@ -363,6 +374,75 @@ let Content = {
     }
   },
 
+  _onZoomToTappedContent: function (aElement) {
+    if (!aElement || this._isZoomedIn) {
+      this._zoomOut();
+      return;
+    }
+
+    while (aElement && !this._shouldZoomToElement(aElement)) {
+      aElement = aElement.parentNode;
+    }
+
+    if (!aElement) {
+      this._zoomOut();
+    } else {
+      this._zoomToElement(aElement);
+    }
+  },
+
+  /******************************************************
+   * Zoom utilities
+   */
+  _zoomOut: function() {
+    let rect = getBoundingContentRect(content.document.documentElement);
+
+    let utils = Util.getWindowUtils(content);
+    let viewId = utils.getViewId(content.document.documentElement);
+    let presShellId = {};
+    utils.getPresShellId(presShellId);
+    let zoomData = [rect.x,
+                    rect.y,
+                    rect.width,
+                    rect.height,
+                    presShellId.value,
+                    viewId].join(",");
+    Services.obs.notifyObservers(null, "Metro:ZoomToRect", zoomData);
+    this._isZoomedIn = false;
+  },
+
+  _zoomToElement: function(aElement) {
+    let rect = getBoundingContentRect(aElement);
+    let utils = Util.getWindowUtils(content);
+    let viewId = utils.getViewId(content.document.documentElement);
+    let presShellId = {};
+    utils.getPresShellId(presShellId);
+    let zoomData = [rect.x,
+                    rect.y,
+                    rect.width,
+                    rect.height,
+                    presShellId.value,
+                    viewId].join(",");
+    Services.obs.notifyObservers(null, "Metro:ZoomToRect", zoomData);
+    this._isZoomedIn = true;
+  },
+
+  _shouldZoomToElement: function(aElement) {
+    let win = aElement.ownerDocument.defaultView;
+    if (win.getComputedStyle(aElement, null).display == "inline") {
+      return false;
+    }
+    else if (aElement instanceof Ci.nsIDOMHTMLLIElement) {
+      return false;
+    }
+    else if (aElement instanceof Ci.nsIDOMHTMLQuoteElement) {
+      return false;
+    }
+    else {
+      return true;
+    }
+  },
+
 
   /******************************************************
    * General utilities

browser/metro/base/content/input.js

@@ -93,7 +93,6 @@ var TouchModule = {
 
     // capture phase events
     window.addEventListener("CancelTouchSequence", this, true);
-    window.addEventListener("dblclick", this, true);
     window.addEventListener("keydown", this, true);
     window.addEventListener("MozMouseHittest", this, true);
 
@@ -144,20 +143,6 @@ var TouchModule = {
           case "touchend":
             this._onTouchEnd(aEvent);
             break;
-          case "dblclick":
-            // XXX This will get picked up somewhere below us for "double tap to zoom"
-            // once we get omtc and the apzc. Currently though dblclick is delivered to
-            // content and triggers selection of text, so fire up the SelectionHelperUI
-            // once selection is present.
-            if (!InputSourceHelper.isPrecise &&
-                !SelectionHelperUI.isActive &&
-                !FindHelperUI.isActive) {
-              setTimeout(function () {
-                SelectionHelperUI.attachEditSession(Browser.selectedTab.browser,
-                                                    aEvent.clientX, aEvent.clientY);
-              }, 50);
-            }
-            break;
           case "keydown":
             this._handleKeyDown(aEvent);
             break;

widget/windows/winrt/MetroWidget.cpp

@@ -278,6 +278,7 @@ MetroWidget::Destroy()
     nsCOMPtr<nsIObserverService> observerService = do_GetService("@mozilla.org/observer-service;1", &rv);
     if (NS_SUCCEEDED(rv)) {
       observerService->RemoveObserver(this, "apzc-scroll-offset-changed");
+      observerService->RemoveObserver(this, "Metro:ZoomToRect");
     }
   }
 
@@ -966,6 +967,7 @@ CompositorParent* MetroWidget::NewCompositorParent(int aSurfaceWidth, int aSurfa
     nsCOMPtr<nsIObserverService> observerService = do_GetService("@mozilla.org/observer-service;1", &rv);
     if (NS_SUCCEEDED(rv)) {
       observerService->AddObserver(this, "apzc-scroll-offset-changed", false);
+      observerService->AddObserver(this, "Metro:ZoomToRect", false);
     }
   }
 
@@ -1561,5 +1563,22 @@ MetroWidget::Observe(nsISupports *subject, const char *topic, const PRUnichar *d
     mController->UpdateScrollOffset(ScrollableLayerGuid(mRootLayerTreeId, presShellId, scrollId),
                                     scrollOffset);
   }
-  return NS_OK;
+  else if (!strcmp(topic, "Metro:ZoomToRect")) {
+    CSSRect rect = CSSRect();
+    uint64_t viewId = 0;
+    int32_t presShellId = 0;
+
+    int reScan = swscanf(data, L"%f,%f,%f,%f,%d,%llu",
+                 &rect.x, &rect.y, &rect.width, &rect.height,
+                 &presShellId, &viewId);
+    if(reScan != 6) {
+      NS_WARNING("Malformed Metro:ZoomToRect message");
+    }
+
+    ScrollableLayerGuid guid = ScrollableLayerGuid(mRootLayerTreeId, presShellId, viewId);
+    APZController::sAPZC->ZoomToRect(guid, rect);
+  }
+  else {
+    return NS_OK;
+  }
 }