Implement double/triple click functionality in views textfield.

views/controls/textfield/native_textfield_views.cc

 // Copyright (c) 2011 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 "views/controls/textfield/native_textfield_views.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 41 matching lines @@
 const char NativeTextfieldViews::kViewClassName[] =
     "views/NativeTextfieldViews";
 
 NativeTextfieldViews::NativeTextfieldViews(Textfield* parent)
     : textfield_(parent),
       model_(new TextfieldViewsModel()),
       text_border_(new TextfieldBorder()),
       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)),
+      tracking_triple_click_(false) {
   set_border(text_border_);
 
   // Multiline is not supported.
   DCHECK_NE(parent->style(), Textfield::STYLE_MULTILINE);
   // Lowercase is not supported.
   DCHECK_NE(parent->style(), Textfield::STYLE_LOWERCASE);
 
   SetContextMenuController(this);
 }
 
 NativeTextfieldViews::~NativeTextfieldViews() {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeTextfieldViews, View overrides:
 
 bool NativeTextfieldViews::OnMousePressed(const views::MouseEvent& e) {
   textfield_->RequestFocus();
-  if (e.IsLeftMouseButton()) {
+  if (e.IsLeftMouseButton() && !DetectAndHandleDoubleAndTripleClick(e)) {
     size_t pos = FindCursorPosition(e.location());
     if (model_->MoveCursorTo(pos, false)) {
       UpdateCursorBoundsAndTextOffset();
       SchedulePaint();
     }
   }
   return true;
 }
 
 bool NativeTextfieldViews::OnMouseDragged(const views::MouseEvent& e) {
@@ skipping 663 matching lines @@
     } else if (pivot == x) {
       return pivot_pos;
     } else {
       right = pivot;
       right_pos = pivot_pos;
     }
   }
   return left_pos;
 }
 
+bool NativeTextfieldViews::DetectAndHandleDoubleAndTripleClick(
+    const views::MouseEvent& e) {
+  if (!e.IsOnlyLeftMouseButton())
+    return false;

[oshima, 2011/01/18 19:52:54]

1) mouse move (with some threshold) should cancel the double/triple clicks.
2) the 3rd click should be same as single click (cursor selection)

It'd be clearer if this returns the type of action to take, and the caller
invokes the methods on model, something like

switch (GetClickAction(event)) {
  case CursorSelect:
  case SelectWord:
  case SelectAll:
}

[varunjain, 2011/01/25 04:06:40]

Done.

+  base::TimeDelta elapsed_time = e.GetTimeStamp() - last_mouse_press_time_;
+  last_mouse_press_time_ = e.GetTimeStamp();
+  if (elapsed_time.InMilliseconds() <= GetDoubleClickTimeMS()) {
+    if (tracking_triple_click_) {
+      model_->SelectAll();
+    } else {
+      model_->SelectWord();
+    }
+    tracking_triple_click_ = !tracking_triple_click_;
+    SchedulePaint();
+    return true;
+  } else {
+    tracking_triple_click_ = false;
+  }
+  return false;
+}
+
 void NativeTextfieldViews::PropagateTextChange() {
   textfield_->SyncText();
   Textfield::Controller* controller = textfield_->GetController();
   if (controller)
     controller->ContentsChanged(textfield_, GetText());
 }
 
 void NativeTextfieldViews::InitContextMenuIfRequired() {
   if (context_menu_menu_.get())
     return;
@@ skipping 56 matching lines @@
 }
 
 void NativeTextfieldViews::TextfieldBorder::SetInsets(int top,
                                                       int left,
                                                       int bottom,
                                                       int right) {
   insets_.Set(top, left, bottom, right);
 }
 
 }  // namespace views