Copies DockInfoGtk into WindowFinder.

I'm going to nuke DockInfo soonish. This is a stup in that
direction.

BUG=none
TEST=none
R=erg@chromium.org

Review URL: https://codereview.chromium.org/165463003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251342 0039d316-1c4b-4281-b951-d872f2087c98

5 files changed, 228 insertions, 25 deletions

diff --git a/chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.cc b/chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.cc
index 586dc63..21ab6d6 100644
--- a/chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.cc
+++ b/chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.cc
@@ -17,7 +17,9 @@
 #include "chrome/browser/ui/gtk/gtk_util.h"
 #include "chrome/browser/ui/gtk/tabs/dragged_view_gtk.h"
 #include "chrome/browser/ui/gtk/tabs/tab_strip_gtk.h"
+#include "chrome/browser/ui/gtk/tabs/window_finder.h"
 #include "chrome/browser/ui/media_utils.h"
+#include "chrome/browser/ui/tabs/dock_info.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_delegate.h"
 #include "content/public/browser/notification_source.h"
@@ -362,12 +364,7 @@ void DraggedTabControllerGtk::MoveDetached(const gfx::Point& screen_point) {
 
 TabStripGtk* DraggedTabControllerGtk::GetTabStripForPoint(
     const gfx::Point& screen_point) {
-  GtkWidget* dragged_window = dragged_view_->widget();
-  dock_windows_.insert(dragged_window);
-  gfx::NativeWindow local_window =
-      DockInfo::GetLocalProcessWindowAtPoint(
-          chrome::HOST_DESKTOP_TYPE_NATIVE, screen_point, dock_windows_);
-  dock_windows_.erase(dragged_window);
+  gfx::NativeWindow local_window = GetLocalProcessWindow(screen_point);
   if (!local_window)
     return NULL;
 
@@ -778,7 +775,7 @@ bool DraggedTabControllerGtk::CompleteDrag() {
 
     Browser* new_browser =
         source_tabstrip_->model()->delegate()->CreateNewStripWithContents(
-            contentses, window_bounds, dock_info_, window->IsMaximized());
+            contentses, window_bounds, DockInfo(), window->IsMaximized());
     RestoreSelection(new_browser->tab_strip_model());
     new_browser->window()->Show();
     CleanUpHiddenFrame();
@@ -874,17 +871,8 @@ void DraggedTabControllerGtk::OnAnimateToBoundsComplete() {
 
 void DraggedTabControllerGtk::BringWindowUnderMouseToFront() {
   // If we're going to dock to another window, bring it to the front.
-  gfx::NativeWindow window = dock_info_.window();
-  if (!window) {
-    gfx::NativeView dragged_tab = dragged_view_->widget();
-    dock_windows_.insert(dragged_tab);
-    window = DockInfo::GetLocalProcessWindowAtPoint(
-        chrome::HOST_DESKTOP_TYPE_NATIVE,
-        gfx::Screen::GetNativeScreen()->GetCursorScreenPoint(),
-        dock_windows_);
-    dock_windows_.erase(dragged_tab);
-  }
-
+  gfx::NativeWindow window = GetLocalProcessWindow(
+      gfx::Screen::GetNativeScreen()->GetCursorScreenPoint());
   if (window)
     gtk_window_present(GTK_WINDOW(window));
 }
@@ -898,3 +886,13 @@ bool DraggedTabControllerGtk::AreTabsConsecutive() {
   }
   return true;
 }
+
+gfx::NativeWindow DraggedTabControllerGtk::GetLocalProcessWindow(
+    const gfx::Point& screen_point) {
+  std::set<GtkWidget*> dragged_window;
+  dragged_window.insert(dragged_view_->widget());
+  return GetLocalProcessWindowAtPoint(
+      gfx::Screen::GetNativeScreen()->GetCursorScreenPoint(),
+      dragged_window);
+
+}
diff --git a/chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.h b/chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.h
index a2a384a..487eed19 100644
--- a/chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.h
+++ b/chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.h
@@ -15,7 +15,6 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/timer/timer.h"
 #include "chrome/browser/ui/gtk/tabs/drag_data.h"
-#include "chrome/browser/ui/tabs/dock_info.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_delegate.h"
@@ -217,6 +216,10 @@ class DraggedTabControllerGtk : public content::NotificationObserver,
   // |source_tabstrip_|.
   bool AreTabsConsecutive();
 
+  // Returns the NativeWindow at the specified point, not including the window
+  // being dragged.
+  gfx::NativeWindow GetLocalProcessWindow(const gfx::Point& screen_point);
+
   // Handles registering for notifications.
   content::NotificationRegistrar registrar_;
 
@@ -255,12 +258,6 @@ class DraggedTabControllerGtk : public content::NotificationObserver,
   // True until |MoveAttached| is invoked once.
   bool initial_move_;
 
-  // DockInfo for the tabstrip.
-  DockInfo dock_info_;
-
-  typedef std::set<GtkWidget*> DockWindows;
-  DockWindows dock_windows_;
-
   // Timer used to bring the window under the cursor to front. If the user
   // stops moving the mouse for a brief time over a browser window, it is
   // brought to front.
diff --git a/chrome/browser/ui/gtk/tabs/window_finder.cc b/chrome/browser/ui/gtk/tabs/window_finder.cc
new file mode 100644
index 0000000..e6e5afc
--- /dev/null
+++ b/chrome/browser/ui/gtk/tabs/window_finder.cc
@@ -0,0 +1,184 @@
+// 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 "chrome/browser/ui/gtk/tabs/window_finder.h"
+
+#include <gtk/gtk.h>
+
+#include "base/logging.h"
+#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_window.h"
+#include "chrome/browser/ui/gtk/browser_window_gtk.h"
+#include "chrome/browser/ui/gtk/gtk_util.h"
+#include "chrome/browser/ui/gtk/tabs/tab_gtk.h"
+#include "chrome/browser/ui/host_desktop.h"
+#include "ui/base/x/x11_util.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace {
+
+////////////////////////////////////////////////////////////////////////////////
+// BaseWindowFinder
+//
+// Base class used to locate a window. A subclass need only override
+// ShouldStopIterating to determine when iteration should stop.
+class BaseWindowFinder : public ui::EnumerateWindowsDelegate {
+ public:
+  explicit BaseWindowFinder(const std::set<GtkWidget*>& ignore) {
+    std::set<GtkWidget*>::iterator iter;
+    for (iter = ignore.begin(); iter != ignore.end(); iter++) {
+      XID xid = ui::GetX11WindowFromGtkWidget(*iter);
+      ignore_.insert(xid);
+    }
+  }
+
+  virtual ~BaseWindowFinder() {}
+
+ protected:
+  // Returns true if |window| is in the ignore list.
+  bool ShouldIgnoreWindow(XID window) {
+    return (ignore_.find(window) != ignore_.end());
+  }
+
+  // Returns true if iteration should stop, false otherwise.
+  virtual bool ShouldStopIterating(XID window) OVERRIDE {
+    return false;
+  }
+
+ private:
+  std::set<XID> ignore_;
+
+  DISALLOW_COPY_AND_ASSIGN(BaseWindowFinder);
+};
+
+////////////////////////////////////////////////////////////////////////////////
+// TopMostFinder
+//
+// Helper class to determine if a particular point of a window is not obscured
+// by another window.
+class TopMostFinder : public BaseWindowFinder {
+ public:
+  // Returns true if |window| is not obscured by another window at the
+  // location |screen_loc|, not including the windows in |ignore|.
+  static bool IsTopMostWindowAtPoint(XID window,
+                                     const gfx::Point& screen_loc,
+                                     const std::set<GtkWidget*>& ignore) {
+    TopMostFinder finder(window, screen_loc, ignore);
+    return finder.is_top_most_;
+  }
+
+ protected:
+  virtual bool ShouldStopIterating(XID window) OVERRIDE {
+    if (BaseWindowFinder::ShouldIgnoreWindow(window))
+      return false;
+
+    if (window == target_) {
+      // Window is topmost, stop iterating.
+      is_top_most_ = true;
+      return true;
+    }
+
+    if (!ui::IsWindowVisible(window)) {
+      // The window isn't visible, keep iterating.
+      return false;
+    }
+
+    if (ui::WindowContainsPoint(window, screen_loc_))
+      return true;
+
+    return false;
+  }
+
+ private:
+  TopMostFinder(XID window,
+                const gfx::Point& screen_loc,
+                const std::set<GtkWidget*>& ignore)
+    : BaseWindowFinder(ignore),
+      target_(window),
+      screen_loc_(screen_loc),
+      is_top_most_(false) {
+    ui::EnumerateTopLevelWindows(this);
+  }
+
+  // The window we're looking for.
+  XID target_;
+
+  // Location of window to find.
+  gfx::Point screen_loc_;
+
+  // Is target_ the top most window? This is initially false but set to true
+  // in ShouldStopIterating if target_ is passed in.
+  bool is_top_most_;
+
+  DISALLOW_COPY_AND_ASSIGN(TopMostFinder);
+};
+
+////////////////////////////////////////////////////////////////////////////////
+// LocalProcessWindowFinder
+//
+// Helper class to determine if a particular point of a window from our process
+// is not obscured by another window.
+class LocalProcessWindowFinder : public BaseWindowFinder {
+ public:
+  // Returns the XID from our process at screen_loc that is not obscured by
+  // another window. Returns 0 otherwise.
+  static XID GetProcessWindowAtPoint(const gfx::Point& screen_loc,
+                                     const std::set<GtkWidget*>& ignore) {
+    LocalProcessWindowFinder finder(screen_loc, ignore);
+    if (finder.result_ &&
+        TopMostFinder::IsTopMostWindowAtPoint(finder.result_, screen_loc,
+                                              ignore)) {
+      return finder.result_;
+    }
+    return 0;
+  }
+
+ protected:
+  virtual bool ShouldStopIterating(XID window) OVERRIDE {
+    if (BaseWindowFinder::ShouldIgnoreWindow(window))
+      return false;
+
+    // Check if this window is in our process.
+    if (!BrowserWindowGtk::GetBrowserWindowForXID(window))
+      return false;
+
+    if (!ui::IsWindowVisible(window))
+      return false;
+
+    if (ui::WindowContainsPoint(window, screen_loc_)) {
+      result_ = window;
+      return true;
+    }
+
+    return false;
+  }
+
+ private:
+  LocalProcessWindowFinder(const gfx::Point& screen_loc,
+                           const std::set<GtkWidget*>& ignore)
+    : BaseWindowFinder(ignore),
+      screen_loc_(screen_loc),
+      result_(0) {
+    ui::EnumerateTopLevelWindows(this);
+  }
+
+  // Position of the mouse.
+  gfx::Point screen_loc_;
+
+  // The resulting window. This is initially null but set to true in
+  // ShouldStopIterating if an appropriate window is found.
+  XID result_;
+
+  DISALLOW_COPY_AND_ASSIGN(LocalProcessWindowFinder);
+};
+
+}  // namespace
+
+GtkWindow* GetLocalProcessWindowAtPoint(
+    const gfx::Point& screen_point,
+    const std::set<GtkWidget*>& ignore) {
+  XID xid =
+      LocalProcessWindowFinder::GetProcessWindowAtPoint(screen_point, ignore);
+  return BrowserWindowGtk::GetBrowserWindowForXID(xid);
+}
diff --git a/chrome/browser/ui/gtk/tabs/window_finder.h b/chrome/browser/ui/gtk/tabs/window_finder.h
new file mode 100644
index 0000000..1fdf1c7
--- /dev/null
+++ b/chrome/browser/ui/gtk/tabs/window_finder.h
@@ -0,0 +1,22 @@
+// Copyright (c) 2014 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.
+
+#ifndef CHROME_BROWSER_UI_GTK_TABS_WINDOW_FINDER_H_
+#define CHROME_BROWSER_UI_GTK_TABS_WINDOW_FINDER_H_
+
+#include <set>
+
+typedef struct _GtkWidget GtkWidget;
+typedef struct _GtkWindow GtkWindow;
+
+namespace gfx {
+class Point;
+}
+
+// Returns the Window at the specified point, ignoring the windows in |ignore|.
+GtkWindow* GetLocalProcessWindowAtPoint(
+    const gfx::Point& screen_point,
+    const std::set<GtkWidget*>& ignore);
+
+#endif  // CHROME_BROWSER_UI_GTK_TABS_WINDOW_FINDER_H_
diff --git a/chrome/chrome_browser_ui.gypi b/chrome/chrome_browser_ui.gypi
index 9408442..c78aa1c 100644
--- a/chrome/chrome_browser_ui.gypi
+++ b/chrome/chrome_browser_ui.gypi
@@ -1408,6 +1408,8 @@
         'browser/ui/gtk/tabs/tab_strip_gtk.h',
         'browser/ui/gtk/tabs/tab_strip_menu_controller.cc',
         'browser/ui/gtk/tabs/tab_strip_menu_controller.h',
+        'browser/ui/gtk/tabs/window_finder.cc',
+        'browser/ui/gtk/tabs/window_finder.h',
         'browser/ui/gtk/task_manager_gtk.cc',
         'browser/ui/gtk/task_manager_gtk.h',
         'browser/ui/gtk/throbber_gtk.cc',