Allow scroll events to open custom launcher pages.

ui/app_list/views/app_list_view.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/app_list/views/app_list_view.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
@@ skipping 320 matching lines @@
 void AppListView::OnThemeChanged() {
 #if defined(OS_WIN)
   GetWidget()->Close();
 #endif
 }
 
 bool AppListView::ShouldHandleSystemCommands() const {
   return true;
 }
 
+bool AppListView::ShouldDescendIntoChildForEventHandling(
+    gfx::NativeView child,
+    const gfx::Point& location) {
+  // On the start page, only descend into the search box widget.
+  // Ideally a scroll inside the search box would also be captured, since that's
+  // not meaningful. However, catching that here would also capture clicks on
+  // the microphone icon.

[calamity, 2015/02/12 04:32:24]

You can always add SearchBoxView::OnScroll/Gesture and forward it to the active
content view (which is what keystrokes do right now).

+  ContentsView* contents_view = app_list_main_view_->contents_view();
+  if (contents_view->GetActiveState() == AppListModel::STATE_START)
+    return child == search_box_widget_->GetNativeView();

[calamity, 2015/02/12 04:32:24]

You're also going to need the google logo webview somewhere here... That can
have a clickable image for doodles.

[tapted, 2015/02/13 04:18:41]

Yes. Also: darn.

Turns out matching up |child| with a corresponding WebView in ui/app_list is
super-hard, since there is no content dependency. Patchset 5 has some
exploration of what that would look like (only works on aura).

Gave up on that and now just check against |location| here -- seems to work
pretty well.

+
+  return views::BubbleDelegateView::ShouldDescendIntoChildForEventHandling(
+      child, location);
+}
+
 void AppListView::Prerender() {
   app_list_main_view_->Prerender();
 }
 
 void AppListView::OnProfilesChanged() {
   app_list_main_view_->search_box_view()->InvalidateMenu();
 }
 
 void AppListView::OnShutdown() {
   // Nothing to do on views - the widget will soon be closed, which will tear
@@ skipping 76 matching lines @@
     speech_view_->layer()->SetOpacity(0.0f);
     AddChildView(speech_view_);
   }
 
   OnProfilesChanged();
 }
 
 void AppListView::InitChildWidgets() {
   DCHECK(search_box_view_);
 
-  app_list_main_view_->InitWidgets();
-
   // Create the search box widget.
   views::Widget::InitParams search_box_widget_params(
       views::Widget::InitParams::TYPE_CONTROL);
   search_box_widget_params.parent = GetWidget()->GetNativeView();
   search_box_widget_params.opacity =
       views::Widget::InitParams::TRANSLUCENT_WINDOW;
 
   // Create a widget for the SearchBoxView to live in. This allows the
   // SearchBoxView to be on top of the custom launcher page's WebContents
   // (otherwise the search box events will be captured by the WebContents).
@@ skipping 308 matching lines @@
 
   if (will_appear) {
     speech_view_->SetVisible(true);
   } else {
     app_list_main_view_->SetVisible(true);
     search_box_view_->search_box()->RequestFocus();
   }
 }
 
 }  // namespace app_list