Added support in Metro mode for retrieving the information about the …

…currently displayed tab url and title.

This is retrieved via a registered window message sent by the metro driver.
The information is used by the share charm in metro.

BUG=125673
R=cpu,sky
Review URL: https://chromiumcodereview.appspot.com/10287005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@134995 0039d316-1c4b-4281-b951-d872f2087c98

base/win/metro.cc

@@ -4,13 +4,22 @@
 
 #include "base/win/metro.h"
 
+#include "base/string_util.h"
+
 namespace base {
 namespace win {
 
 HMODULE GetMetroModule() {
   return GetModuleHandleA("metro_driver.dll");
 }
 
+wchar_t* LocalAllocAndCopyString(const string16& src) {
+  size_t dest_size = (src.length() + 1) * sizeof(wchar_t);
+  wchar_t* dest = reinterpret_cast<wchar_t*>(LocalAlloc(LPTR, dest_size));
+  base::wcslcpy(dest, src.c_str(), dest_size);
+  return dest;
+}
+
 }  // namespace win
 }  // namespace base
 

base/win/metro.h

@@ -9,6 +9,7 @@
 #include <windows.h>
 
 #include "base/base_export.h"
+#include "base/string16.h"
 
 namespace base {
 namespace win {
@@ -44,6 +45,10 @@ struct CurrentTabInfo {
 // indicates that the metro dll was not loaded in the process.
 BASE_EXPORT HMODULE GetMetroModule();
 
+// Allocates and returns the destination string via the LocalAlloc API after
+// copying the src to it.
+BASE_EXPORT wchar_t* LocalAllocAndCopyString(const string16& src);
+
 }  // namespace win
 }  // namespace base
 

chrome/browser/ui/views/frame/browser_frame_win.cc

@@ -10,6 +10,7 @@
 #include <set>
 
 #include "base/command_line.h"
+#include "base/utf_string_conversions.h"
 #include "base/win/metro.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/search_engines/template_url.h"
@@ -24,7 +25,9 @@
 #include "chrome/common/chrome_switches.h"
 #include "content/public/browser/browser_accessibility_state.h"
 #include "content/public/browser/page_navigator.h"
+#include "content/public/browser/web_contents.h"
 #include "content/public/common/page_transition_types.h"
+#include "googleurl/src/gurl.h"
 #include "grit/generated_resources.h"
 #include "grit/theme_resources.h"
 #include "ui/base/models/simple_menu_model.h"
@@ -50,6 +53,7 @@ static int explicit_show_state = -1;
 
 using content::OpenURLParams;
 using content::Referrer;
+using content::WebContents;
 
 ///////////////////////////////////////////////////////////////////////////////
 // BrowserFrameWin, public:
@@ -208,9 +212,15 @@ LRESULT BrowserFrameWin::OnWndProc(UINT message,
                                    LPARAM l_param) {
   static const UINT metro_navigation_search_message =
       RegisterWindowMessage(chrome::kMetroNavigationAndSearchMessage);
-  if (message == metro_navigation_search_message)
-    HandleMetroRequest(w_param, l_param);
 
+  static const UINT metro_get_current_tab_info_message =
+      RegisterWindowMessage(chrome::kMetroGetCurrentTabInfoMessage);
+
+  if (message == metro_navigation_search_message) {
+    HandleMetroNavSearchRequest(w_param, l_param);
+  } else if (message == metro_get_current_tab_info_message) {
+    GetMetroCurrentTabInfo(w_param);
+  }
   return views::NativeWidgetWin::OnWndProc(message, w_param, l_param);
 }
 
@@ -307,7 +317,8 @@ void BrowserFrameWin::AddFrameToggleItems() {
   }
 }
 
-void BrowserFrameWin::HandleMetroRequest(WPARAM w_param, LPARAM l_param) {
+void BrowserFrameWin::HandleMetroNavSearchRequest(WPARAM w_param,
+                                                  LPARAM l_param) {
   if (!base::win::GetMetroModule()) {
     NOTREACHED() << "Received unexpected metro navigation request";
     return;
@@ -346,6 +357,35 @@ void BrowserFrameWin::HandleMetroRequest(WPARAM w_param, LPARAM l_param) {
   }
 }
 
+void BrowserFrameWin::GetMetroCurrentTabInfo(WPARAM w_param) {
+  if (!base::win::GetMetroModule()) {
+    NOTREACHED() << "Received unexpected metro request";
+    return;
+  }
+
+  if (!w_param) {
+    NOTREACHED() << "Invalid metro request parameter";
+    return;
+  }
+
+  base::win::CurrentTabInfo* current_tab_info =
+      reinterpret_cast<base::win::CurrentTabInfo*>(w_param);
+
+  Browser* browser = browser_view()->browser();
+  DCHECK(browser);
+
+  // We allocate memory for the title and url via LocalAlloc. The caller has to
+  // free the memory via LocalFree.
+  current_tab_info->title = base::win::LocalAllocAndCopyString(
+      browser->GetWindowTitleForCurrentTab());
+
+  WebContents* current_tab = browser->GetSelectedWebContents();
+  DCHECK(current_tab);
+
+  current_tab_info->url = base::win::LocalAllocAndCopyString(
+      UTF8ToWide(current_tab->GetURL().spec()));
+}
+
 
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserFrame, public:

chrome/browser/ui/views/frame/browser_frame_win.h

@@ -77,8 +77,11 @@ class BrowserFrameWin : public views::NativeWidgetWin,
   // Adds optional debug items for frame type toggling.
   void AddFrameToggleItems();
 
-  // Handles metro navigation search requests.
-  void HandleMetroRequest(WPARAM w_param, LPARAM l_param);
+  // Handles metro navigation and search requests.
+  void HandleMetroNavSearchRequest(WPARAM w_param, LPARAM l_param);
+
+  // Returns information about the currently displayed tab in metro mode.
+  void GetMetroCurrentTabInfo(WPARAM w_param);
 
   // The BrowserView is our ClientView. This is a pointer to it.
   BrowserView* browser_view_;

chrome/common/chrome_constants.cc

@@ -203,7 +203,8 @@ const char kPreReadEnvironmentVariable[] = "CHROME_PRE_READ_EXPERIMENT";
 const wchar_t kMetroChromeUserDataSubDir[] = L"Metro";
 const wchar_t kMetroNavigationAndSearchMessage[] =
     L"CHROME_METRO_NAV_SEARCH_REQUEST";
-
+const wchar_t kMetroGetCurrentTabInfoMessage[] =
+    L"CHROME_METRO_GET_CURRENT_TAB_INFO";
 #endif
 
 }  // namespace chrome

chrome/common/chrome_constants.h

@@ -134,6 +134,8 @@ extern const char kPreReadEnvironmentVariable[];
 extern const wchar_t kMetroChromeUserDataSubDir[];
 // Used by Metro Chrome to initiate navigation and search requests.
 extern const wchar_t kMetroNavigationAndSearchMessage[];
+// Used by Metro Chrome to get information about the current tab.
+extern const wchar_t kMetroGetCurrentTabInfoMessage[];
 #endif
 
 }  // namespace chrome