Mac: make save/open dialogs operate as tab-modal sheets....

chrome/browser/tab_contents/constrained_window.h

Index: chrome/browser/tab_contents/constrained_window.h
diff --git a/chrome/browser/tab_contents/constrained_window.h b/chrome/browser/tab_contents/constrained_window.h
index a1b8c2abcb84cb3b3862e3b2ea28d1d3fdd5637d..a52b9ffb0ee1340f833b32f61293c25c902bd451 100644
--- a/chrome/browser/tab_contents/constrained_window.h
+++ b/chrome/browser/tab_contents/constrained_window.h
@@ -1,10 +1,12 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2006-2009 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_TAB_CONTENTS_CONSTRAINED_WINDOW_H_
 #define CHROME_BROWSER_TAB_CONTENTS_CONSTRAINED_WINDOW_H_
 
+#include <set>
+
 #include "chrome/common/page_transition_types.h"
 #include "webkit/glue/window_open_disposition.h"
 
@@ -42,6 +44,45 @@ class ConstrainedWindow {
 
   // Closes the Constrained Window.
   virtual void CloseConstrainedWindow() = 0;
+
+  // Events which constrained windows may recognize.
+  enum Event {
+    kEventNavigate,
+  };
+
+  // Inform the constrained the window that its parent tab will do something.
+  // Returns |true| if it did something in response, |false| if not. The default
+  // implementation, appropriate for "content-area" constrained windows, does
+  // the following:
+  //  - |kEventNavigate|: calls |CloseConstrainedWindow()|;
+  //  - anything/everything else: nothing.
+  // Platforms which implement non-"content-area" constrained windows (e.g.,
+  // tab-modal open/close dialogs) should override this.
+  virtual bool ParentWillDo(Event event);
+
+  // The level of modality, in order of increasing modality (or in the
+  // enumeration is important):
+  //  - kModalNone: no modality (not for use by constrained windows themselves
+  //    -- but for others when reporting the current modality level)
+  //  - kModalForContent: "content-modality" (toolbar, navigation, etc. remain
+  //    enabled)
+  //  - kModalForTab: full tab-modality (visual tab contents are all disabled)
+  //  - kModalForWindow: window-modality (reserved)
+  // Things which are disabled for a given level of modality should also be
+  // disabled for higher levels.
+  // TODO(viettrungluu@gmail.com): These probably deserve a better (more
+  // general) home than in the constrained window stuff.
+  enum ModalityLevel {
+    kModalNone = 0,
+    kModalForContent,
+    kModalForTab,
+    kModalForWindow
+  };
+
+  // Gets the modality level of the constrained window (which should be static,
+  // in that it should not vary over the lifetime of the window). The default
+  // implementation produces only "content-modal" constrained windows.
+  virtual ModalityLevel GetModalityLevel() { return kModalForContent; }
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_CONSTRAINED_WINDOW_H_