Implement double/triple click functionality in views textfield. Also changed views::Event::time_stamp_ to a platform independent time stamp.

@beng: please review views::Event changes (event.cc,event.h)
@oshima: please review the rest

BUG=none
TEST=new tests added.

Review URL: http://codereview.chromium.org/6267002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72736 0039d316-1c4b-4281-b951-d872f2087c98

8 files changed, 196 insertions, 17 deletions

diff --git a/views/controls/textfield/native_textfield_views.cc b/views/controls/textfield/native_textfield_views.cc
index a4324be2..08f93e3 100644
--- a/views/controls/textfield/native_textfield_views.cc
+++ b/views/controls/textfield/native_textfield_views.cc
@@ -59,7 +59,9 @@ NativeTextfieldViews::NativeTextfieldViews(Textfield* parent)
       text_offset_(0),
       insert_(true),
       is_cursor_visible_(false),
-      ALLOW_THIS_IN_INITIALIZER_LIST(cursor_timer_(this)) {
+      ALLOW_THIS_IN_INITIALIZER_LIST(cursor_timer_(this)),
+      last_mouse_press_time_(base::Time::FromInternalValue(0)),
+      click_state_(NONE) {
   set_border(text_border_);
 
   // Multiline is not supported.
@@ -77,14 +79,8 @@ NativeTextfieldViews::~NativeTextfieldViews() {
 // NativeTextfieldViews, View overrides:
 
 bool NativeTextfieldViews::OnMousePressed(const views::MouseEvent& e) {
-  textfield_->RequestFocus();
-  if (e.IsLeftMouseButton()) {
-    size_t pos = FindCursorPosition(e.location());
-    if (model_->MoveCursorTo(pos, false)) {
-      UpdateCursorBoundsAndTextOffset();
-      SchedulePaint();
-    }
-  }
+  if (HandleMousePressed(e))
+    SchedulePaint();
   return true;
 }
 
@@ -784,6 +780,47 @@ size_t NativeTextfieldViews::FindCursorPosition(const gfx::Point& point) const {
   return left_pos;
 }
 
+bool NativeTextfieldViews::HandleMousePressed(const views::MouseEvent& e) {
+  textfield_->RequestFocus();
+  base::TimeDelta time_delta = e.GetTimeStamp() - last_mouse_press_time_;
+  gfx::Point location_delta = e.location().Subtract(last_mouse_press_location_);
+  last_mouse_press_time_ = e.GetTimeStamp();
+  last_mouse_press_location_ = e.location();
+  if (e.IsLeftMouseButton()) {
+    if (!ExceededDragThreshold(location_delta.x(), location_delta.y())
+      && time_delta.InMilliseconds() <= GetDoubleClickTimeMS()) {
+      // Multiple mouse press detected. Check for double or triple.
+      switch (click_state_) {
+        case TRACKING_DOUBLE_CLICK:
+          click_state_ = TRACKING_TRIPLE_CLICK;
+          model_->SelectWord();
+          return true;
+        case TRACKING_TRIPLE_CLICK:
+          click_state_ = NONE;
+          model_->SelectAll();
+          return true;
+        case NONE:
+          click_state_ = TRACKING_DOUBLE_CLICK;
+          SetCursorForMouseClick(e);
+          return true;
+      }
+    } else {
+      // Single mouse press.
+      click_state_ = TRACKING_DOUBLE_CLICK;
+      SetCursorForMouseClick(e);
+      return true;
+    }
+  }
+  return false;
+}
+
+void NativeTextfieldViews::SetCursorForMouseClick(const views::MouseEvent& e) {
+  size_t pos = FindCursorPosition(e.location());
+  if (model_->MoveCursorTo(pos, false)) {
+    UpdateCursorBoundsAndTextOffset();
+  }
+}
+
 void NativeTextfieldViews::PropagateTextChange() {
   textfield_->SyncText();
   Textfield::Controller* controller = textfield_->GetController();
diff --git a/views/controls/textfield/native_textfield_views.h b/views/controls/textfield/native_textfield_views.h
index d474a72..fb567cf 100644
--- a/views/controls/textfield/native_textfield_views.h
+++ b/views/controls/textfield/native_textfield_views.h
@@ -14,6 +14,10 @@
 #include "views/controls/textfield/native_textfield_wrapper.h"
 #include "views/view.h"
 
+namespace base {
+class Time;
+}
+
 namespace gfx {
 class Canvas;
 }  // namespace
@@ -108,6 +112,13 @@ class NativeTextfieldViews : public views::View,
   // Enable/Disable TextfieldViews implementation for Textfield.
   static void SetEnableTextfieldViews(bool enabled);
 
+  enum ClickState {
+    TRACKING_DOUBLE_CLICK,
+    TRACKING_TRIPLE_CLICK,
+    NONE,
+  };
+
+
  private:
   friend class NativeTextfieldViewsTest;
 
@@ -162,6 +173,13 @@ class NativeTextfieldViews : public views::View,
   // Find a cusor position for given |point| in this views coordinates.
   size_t FindCursorPosition(const gfx::Point& point) const;
 
+  // Mouse event handler. Returns true if textfield needs to be repainted.
+  bool HandleMousePressed(const views::MouseEvent& e);
+
+  // Helper function that sets the cursor position at the location of mouse
+  // event.
+  void SetCursorForMouseClick(const views::MouseEvent& e);
+
   // Utility function to inform the parent textfield (and its controller if any)
   // that the text in the textfield has changed.
   void PropagateTextChange();
@@ -193,6 +211,15 @@ class NativeTextfieldViews : public views::View,
   // A runnable method factory for callback to update the cursor.
   ScopedRunnableMethodFactory<NativeTextfieldViews> cursor_timer_;
 
+  // Time of last LEFT mouse press. Used for tracking double/triple click.
+  base::Time last_mouse_press_time_;
+
+  // Position of last LEFT mouse press. Used for tracking double/triple click.
+  gfx::Point last_mouse_press_location_;
+
+  // State variable to track double and triple clicks.
+  ClickState click_state_;
+
   // Context menu and its content list for the textfield.
   scoped_ptr<ui::SimpleMenuModel> context_menu_contents_;
   scoped_ptr<Menu2> context_menu_menu_;
diff --git a/views/controls/textfield/native_textfield_views_unittest.cc b/views/controls/textfield/native_textfield_views_unittest.cc
index d8bffbe..3824868 100644
--- a/views/controls/textfield/native_textfield_views_unittest.cc
+++ b/views/controls/textfield/native_textfield_views_unittest.cc
@@ -104,6 +104,10 @@ class NativeTextfieldViewsTest : public ViewsTestBase,
     return textfield_view_->context_menu_menu_.get();
   }
 
+  NativeTextfieldViews::ClickState GetClickState() {
+    return textfield_view_->click_state_;
+  }
+
  protected:
   bool SendKeyEventToTextfieldViews(ui::KeyboardCode key_code,
                                     bool shift,
@@ -428,6 +432,31 @@ TEST_F(NativeTextfieldViewsTest, ContextMenuDisplayTest) {
   VerifyTextfieldContextMenuContents(true, GetContextMenu()->model());
 }
 
+TEST_F(NativeTextfieldViewsTest, DoubleAndTripleClickTest) {
+  InitTextfield(Textfield::STYLE_DEFAULT);
+  textfield_->SetText(ASCIIToUTF16("hello world"));
+  MouseEvent me(MouseEvent::ET_MOUSE_PRESSED, 0, 0, Event::EF_LEFT_BUTTON_DOWN);
+  EXPECT_EQ(NativeTextfieldViews::NONE, GetClickState());
+
+  // Test for double click.
+  textfield_view_->OnMousePressed(me);
+  EXPECT_STR_EQ("", textfield_->GetSelectedText());
+  EXPECT_EQ(NativeTextfieldViews::TRACKING_DOUBLE_CLICK, GetClickState());
+  textfield_view_->OnMousePressed(me);
+  EXPECT_STR_EQ("hello", textfield_->GetSelectedText());
+  EXPECT_EQ(NativeTextfieldViews::TRACKING_TRIPLE_CLICK, GetClickState());
+
+  // Test for triple click.
+  textfield_view_->OnMousePressed(me);
+  EXPECT_STR_EQ("hello world", textfield_->GetSelectedText());
+  EXPECT_EQ(NativeTextfieldViews::NONE, GetClickState());
+
+  // Another click should reset back to single click.
+  textfield_view_->OnMousePressed(me);
+  EXPECT_STR_EQ("", textfield_->GetSelectedText());
+  EXPECT_EQ(NativeTextfieldViews::TRACKING_DOUBLE_CLICK, GetClickState());
+}
+
 TEST_F(NativeTextfieldViewsTest, ReadOnlyTest) {
   scoped_ptr<TestViewsDelegate> test_views_delegate(new TestViewsDelegate());
   AutoReset<views::ViewsDelegate*> auto_reset(
diff --git a/views/controls/textfield/textfield_views_model.cc b/views/controls/textfield/textfield_views_model.cc
index 585840d..d9449d3 100644
--- a/views/controls/textfield/textfield_views_model.cc
+++ b/views/controls/textfield/textfield_views_model.cc
@@ -235,6 +235,41 @@ void TextfieldViewsModel::SelectAll() {
   selection_begin_ = 0;
 }
 
+void TextfieldViewsModel::SelectWord() {
+  // First we setup selection_begin_ and cursor_pos_. There are so many cases
+  // because we try to emulate what select-word looks like in a gtk textfield.
+  // See associated testcase for different cases.
+  if (cursor_pos_ > 0 && cursor_pos_ < text_.length()) {
+    if (isalnum(text_[cursor_pos_])) {
+      selection_begin_ = cursor_pos_;
+      cursor_pos_++;
+    } else
+      selection_begin_ = cursor_pos_ - 1;
+  } else if (cursor_pos_ == 0) {
+    selection_begin_ = cursor_pos_;
+    if (text_.length() > 0)
+      cursor_pos_++;
+  } else {
+    selection_begin_ = cursor_pos_ - 1;
+  }
+
+  // Now we move selection_begin_ to beginning of selection. Selection boundary
+  // is defined as the position where we have alpha-num character on one side
+  // and non-alpha-num char on the other side.
+  for (; selection_begin_ > 0; selection_begin_--) {
+    if (IsPositionAtWordSelectionBoundary(selection_begin_))
+      break;
+  }
+
+  // Now we move cursor_pos_ to end of selection. Selection boundary
+  // is defined as the position where we have alpha-num character on one side
+  // and non-alpha-num char on the other side.
+  for (; cursor_pos_ < text_.length(); cursor_pos_++) {
+    if (IsPositionAtWordSelectionBoundary(cursor_pos_))
+      break;
+  }
+}
+
 void TextfieldViewsModel::ClearSelection() {
   selection_begin_ = cursor_pos_;
 }
@@ -292,6 +327,11 @@ string16 TextfieldViewsModel::GetVisibleText(size_t begin, size_t end) const {
   return text_.substr(begin, end - begin);
 }
 
+bool TextfieldViewsModel::IsPositionAtWordSelectionBoundary(size_t pos) {
+  return (isalnum(text_[pos - 1]) && !isalnum(text_[pos])) ||
+      (!isalnum(text_[pos - 1]) && isalnum(text_[pos]));
+}
+
 size_t TextfieldViewsModel::GetSafePosition(size_t position) const {
   if (position > text_.length()) {
     return text_.length();
diff --git a/views/controls/textfield/textfield_views_model.h b/views/controls/textfield/textfield_views_model.h
index a87157a..bcdc6bc 100644
--- a/views/controls/textfield/textfield_views_model.h
+++ b/views/controls/textfield/textfield_views_model.h
@@ -123,6 +123,9 @@ class TextfieldViewsModel {
   // Selects all text.
   void SelectAll();
 
+  // Selects the word at which the cursor is currently positioned.
+  void SelectWord();
+
   // Clears selection.
   void ClearSelection();
 
@@ -155,6 +158,9 @@ class TextfieldViewsModel {
   // Returns the visible text given |start| and |end|.
   string16 GetVisibleText(size_t start, size_t end) const;
 
+  // Utility for SelectWord(). Checks whether position pos is at word boundary.
+  bool IsPositionAtWordSelectionBoundary(size_t pos);
+
   // Returns the normalized cursor position that does not exceed the
   // text length.
   size_t GetSafePosition(size_t position) const;
diff --git a/views/controls/textfield/textfield_views_model_unittest.cc b/views/controls/textfield/textfield_views_model_unittest.cc
index 1c45d74..b0a29c4 100644
--- a/views/controls/textfield/textfield_views_model_unittest.cc
+++ b/views/controls/textfield/textfield_views_model_unittest.cc
@@ -361,6 +361,49 @@ TEST_F(TextfieldViewsModelTest, Clipboard) {
   EXPECT_EQ(29U, model.cursor_pos());
 }
 
+void SelectWordTestVerifier(TextfieldViewsModel &model,
+    const std::string &expected_selected_string, size_t expected_cursor_pos) {
+  EXPECT_STR_EQ(expected_selected_string, model.GetSelectedText());
+  EXPECT_EQ(expected_cursor_pos, model.cursor_pos());
+}
+
+TEST_F(TextfieldViewsModelTest, SelectWordTest) {
+  TextfieldViewsModel model;
+  model.Append(ASCIIToUTF16("  HELLO  !!  WO     RLD "));
+
+  // Test when cursor is at the beginning.
+  model.MoveCursorToStart(false);
+  model.SelectWord();
+  SelectWordTestVerifier(model, "  ", 2U);
+
+  // Test when cursor is at the beginning of a word.
+  model.MoveCursorTo(2U, false);
+  model.SelectWord();
+  SelectWordTestVerifier(model, "HELLO", 7U);
+
+  // Test when cursor is at the end of a word.
+  model.MoveCursorTo(15U, false);
+  model.SelectWord();
+  SelectWordTestVerifier(model, "WO", 15U);
+
+  // Test when cursor is somewhere in a non-alph-numeric fragment.
+  for (size_t cursor_pos = 8; cursor_pos < 13U; cursor_pos++) {
+    model.MoveCursorTo(cursor_pos, false);
+    model.SelectWord();
+    SelectWordTestVerifier(model, "  !!  ", 13U);
+  }
+
+  // Test when cursor is somewhere in a whitespace fragment.
+  model.MoveCursorTo(17U, false);
+  model.SelectWord();
+  SelectWordTestVerifier(model, "     ", 20U);
+
+  // Test when cursor is at the end.
+  model.MoveCursorToEnd(false);
+  model.SelectWord();
+  SelectWordTestVerifier(model, " ", 24U);
+}
+
 TEST_F(TextfieldViewsModelTest, RangeTest) {
   TextfieldViewsModel model;
   model.Append(ASCIIToUTF16("HELLO WORLD"));
diff --git a/views/event.cc b/views/event.cc
index 7584a4d..cead011 100644
--- a/views/event.cc
+++ b/views/event.cc
@@ -10,11 +10,7 @@ namespace views {
 
 Event::Event(EventType type, int flags)
     : type_(type),
-#if defined(OS_WIN)
-      time_stamp_(GetTickCount()),
-#else
-      time_stamp_(0),
-#endif
+      time_stamp_(base::Time::NowFromSystemTime()),
       flags_(flags) {
 }
 
diff --git a/views/event.h b/views/event.h
index 3815886..c893eeaf 100644
--- a/views/event.h
+++ b/views/event.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include "base/basictypes.h"
+#include "base/time.h"
 #include "gfx/point.h"
 #include "ui/base/keycodes/keyboard_codes.h"
 
@@ -80,8 +81,8 @@ class Event {
     return type_;
   }
 
-  // Return the event time stamp in ticks
-  int GetTimeStamp() const {
+  // Return the event time stamp.
+  const base::Time& GetTimeStamp() const {
     return time_stamp_;
   }
 
@@ -157,7 +158,7 @@ class Event {
   void operator=(const Event&);
 
   EventType type_;
-  int time_stamp_;
+  base::Time time_stamp_;
   int flags_;
 };