Resubmit: Open the WrenchMenu on mouseover when dragging a browser action

chrome/browser/ui/views/toolbar/wrench_toolbar_button.cc

 // Copyright 2013 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 "chrome/browser/ui/views/toolbar/wrench_toolbar_button.h"
 
+#include "base/message_loop/message_loop.h"
+#include "base/time/time.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/views/extensions/browser_action_drag_data.h"
+#include "chrome/browser/ui/views/toolbar/toolbar_view.h"
+#include "extensions/common/feature_switch.h"
 #include "grit/theme_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/theme_provider.h"
+#include "ui/views/metrics.h"
 #include "ui/views/painter.h"
 
-WrenchToolbarButton::WrenchToolbarButton(views::MenuButtonListener* listener)
-    : views::MenuButton(NULL, base::string16(), listener, false) {
-  wrench_icon_painter_.reset(new WrenchIconPainter(this));
+// static
+bool WrenchToolbarButton::g_open_wrench_immediately_for_testing = false;
+
+WrenchToolbarButton::WrenchToolbarButton(ToolbarView* toolbar_view)
+    : views::MenuButton(NULL, base::string16(), toolbar_view, false),
+      wrench_icon_painter_(new WrenchIconPainter(this)),
+      toolbar_view_(toolbar_view),
+      allow_extension_dragging_(
+          extensions::FeatureSwitch::extension_action_redesign()->IsEnabled()),
+      weak_factory_(this) {
 }
 
 WrenchToolbarButton::~WrenchToolbarButton() {
 }
 
 void WrenchToolbarButton::SetSeverity(WrenchIconPainter::Severity severity,
                                       bool animate) {
   wrench_icon_painter_->SetSeverity(severity, animate);
   SchedulePaint();
 }
 
 gfx::Size WrenchToolbarButton::GetPreferredSize() const {
   return ResourceBundle::GetSharedInstance().
       GetImageSkiaNamed(IDR_TOOLBAR_BEZEL_HOVER)->size();
 }
 
 void WrenchToolbarButton::OnPaint(gfx::Canvas* canvas) {
   views::MenuButton::OnPaint(canvas);
   wrench_icon_painter_->Paint(canvas,
                               GetThemeProvider(),
                               gfx::Rect(size()),
                               WrenchIconPainter::BEZEL_NONE);
 }
 
 void WrenchToolbarButton::ScheduleWrenchIconPaint() {
   SchedulePaint();
 }
+
+bool WrenchToolbarButton::GetDropFormats(
+    int* formats, std::set<ui::OSExchangeData::CustomFormat>* custom_formats) {
+  return allow_extension_dragging_ ?
+      BrowserActionDragData::GetDropFormats(custom_formats) :
+      views::View::GetDropFormats(formats, custom_formats);
+}
+bool WrenchToolbarButton::AreDropTypesRequired() {
+  return allow_extension_dragging_ ?
+      BrowserActionDragData::AreDropTypesRequired() :
+      views::View::AreDropTypesRequired();
+}
+bool WrenchToolbarButton::CanDrop(const ui::OSExchangeData& data) {
+  return allow_extension_dragging_ ?
+      BrowserActionDragData::CanDrop(data,
+                                     toolbar_view_->browser()->profile()) :
+      views::View::CanDrop(data);
+}
+
+void WrenchToolbarButton::OnDragEntered(const ui::DropTargetEvent& event) {
+  DCHECK(allow_extension_dragging_);
+  DCHECK(!weak_factory_.HasWeakPtrs());
+  if (!g_open_wrench_immediately_for_testing) {
+    base::MessageLoop::current()->PostDelayedTask(
+        FROM_HERE,
+        base::Bind(&WrenchToolbarButton::ShowOverflowMenu,
+                   weak_factory_.GetWeakPtr()),
+        base::TimeDelta::FromMilliseconds(views::GetMenuShowDelay()));
+  } else {
+    ShowOverflowMenu();
+  }
+}
+
+int WrenchToolbarButton::OnDragUpdated(const ui::DropTargetEvent& event) {
+  DCHECK(allow_extension_dragging_);
+  return ui::DragDropTypes::DRAG_MOVE;
+}
+
+void WrenchToolbarButton::OnDragExited() {
+  DCHECK(allow_extension_dragging_);
+  weak_factory_.InvalidateWeakPtrs();
+}
+
+int WrenchToolbarButton::OnPerformDrop(const ui::DropTargetEvent& event) {
+  DCHECK(allow_extension_dragging_);
+  return ui::DragDropTypes::DRAG_MOVE;
+}
+
+void WrenchToolbarButton::ShowOverflowMenu() {
+  toolbar_view_->ShowAppMenu(true);  // For drop.
+}