Make NativeTextfieldViews update the win system caret.

Added a helper function to ui/base/win because we're
going to need to do the same thing from content/browser.

BUG=142133

Review URL: https://codereview.chromium.org/61923005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233759 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 28 insertions, 1 deletions

diff --git a/ui/base/win/accessibility_misc_utils.cc b/ui/base/win/accessibility_misc_utils.cc
index 5074ce3..391482b 100644
--- a/ui/base/win/accessibility_misc_utils.cc
+++ b/ui/base/win/accessibility_misc_utils.cc
@@ -4,11 +4,29 @@
 #include "ui/base/win/accessibility_misc_utils.h"
 
 #include "base/logging.h"
+#include "base/win/scoped_gdi_object.h"
 #include "ui/base/win/atl_module.h"
 
 namespace base {
 namespace win {
 
+void SetInvisibleSystemCaretRect(HWND hwnd, const gfx::Rect& caret_rect) {
+  // Create an invisible bitmap.
+  base::win::ScopedGDIObject<HBITMAP> caret_bitmap(
+      CreateBitmap(1, caret_rect.height(), 1, 1, NULL));
+
+  // This destroys the previous caret (no matter what window it belonged to)
+  // and creates a new one owned by this window.
+  if (!CreateCaret(hwnd, caret_bitmap, 1, caret_rect.height()))
+    return;
+
+  ShowCaret(hwnd);
+  RECT window_rect;
+  GetWindowRect(hwnd, &window_rect);
+  SetCaretPos(caret_rect.x() - window_rect.left + 2,
+              caret_rect.y() - window_rect.top + 2);
+}
+
 // UIA TextProvider implementation.
 UIATextProvider::UIATextProvider()
     : editable_(false) {}
diff --git a/ui/base/win/accessibility_misc_utils.h b/ui/base/win/accessibility_misc_utils.h
index 3789efb..dfee14f 100644
--- a/ui/base/win/accessibility_misc_utils.h
+++ b/ui/base/win/accessibility_misc_utils.h
@@ -10,11 +10,20 @@
 
 #include "base/compiler_specific.h"
 #include "ui/base/ui_export.h"
+#include "ui/gfx/rect.h"
 
 namespace base {
 namespace win {
 
-  // UIA Text provider implementation for edit controls.
+// This is used when we draw our own caret. Updates the system caret rect
+// to the given bounding rectangle but makes it invisible. This allows
+// utilities that help the user find the system caret to continue to work.
+// |hwnd| should be the owning window, and |caret_rect| is in global
+// screen coordinates.
+UI_EXPORT void SetInvisibleSystemCaretRect(HWND hwnd,
+                                           const gfx::Rect& caret_rect);
+
+// UIA Text provider implementation for edit controls.
 class UI_EXPORT UIATextProvider
     : public NON_EXPORTED_BASE(CComObjectRootEx<CComMultiThreadModel>),
       public IValueProvider,