no native implementation of Textfield.

views/controls/textfield/native_textfield_views.cc

+// Copyright (c) 2010 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"
+#include "base/message_loop.h"
+#include "base/utf_string_conversions.h"
+#include "gfx/canvas.h"
+#include "gfx/canvas_skia.h"
+#include "gfx/insets.h"
+#include "views/background.h"
+#include "views/border.h"
+#include "views/controls/textfield/native_textfield_gtk.h"
+#include "views/controls/textfield/textfield.h"
+#include "views/controls/textfield/textfield_views_model.h"
+#include "views/event.h"
+
+namespace {
+
+// A global flag to switch the Textfield wrapper to TextfieldViews.
+bool textfield_view_enabled = false;
+
+// Color setttings for text, border, backgrounds and cursor.
+// These are tentative, and should be derived from theme, system
+// settings and current settings.
+const SkColor kSelectedTextColor = SK_ColorWHITE;
+const SkColor kReadonlyTextColor = SK_ColorDKGRAY;
+const SkColor kFocusedSelectionColor = SK_ColorBLUE;
+const SkColor kUnfocusedSelectionColor = SK_ColorLTGRAY;
+const SkColor kFocusedBorderColor = SK_ColorCYAN;
+const SkColor kDefaultBorderColor = SK_ColorGRAY;
+const SkColor kCursorColor = SK_ColorBLACK;
+
+// Parameters to control cursor blinking.
+const int kCursorVisibleTimeMs = 800;
+const int kCursorInvisibleTimeMs = 500;
+
+// A switch to enable NativeTextfieldViews;
+const char kEnableViewsBasedTextfieldSwitch[] = "enable-textfield-view";
+}  // namespace
+
+namespace views {
+
+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)) {
+  SetFocusable(true);
+  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);
+}
+
+NativeTextfieldViews::~NativeTextfieldViews() {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeTextfieldViews, View overrides:
+
+bool NativeTextfieldViews::OnMousePressed(const views::MouseEvent& e) {
+  RequestFocus();
+  size_t pos = FindCursorPosition(e.location());
+  if (model_->MoveCursorTo(pos, false)) {
+    UpdateCursorBoundsAndTextOffset();
+    SchedulePaint();
+  }
+  return true;
+}
+
+bool NativeTextfieldViews::OnMouseDragged(const views::MouseEvent& e) {
+  size_t pos = FindCursorPosition(e.location());
+  if (model_->MoveCursorTo(pos, true)) {
+    UpdateCursorBoundsAndTextOffset();
+    SchedulePaint();
+  }
+  return true;
+}
+
+void NativeTextfieldViews::OnMouseReleased(const views::MouseEvent& e,
+                                          bool canceled) {
+}
+
+bool NativeTextfieldViews::OnKeyPressed(const views::KeyEvent& e) {
+  Textfield::Controller* controller = textfield_->GetController();
+  bool handled = false;
+  if (controller) {
+    Textfield::Keystroke ks(&e);
+    handled = controller->HandleKeystroke(textfield_, ks);
+  }
+  return handled || HandleKeyEvent(e);
+}
+
+bool NativeTextfieldViews::OnKeyReleased(const views::KeyEvent& e) {
+  return true;
+}
+
+void NativeTextfieldViews::Paint(gfx::Canvas* canvas) {
+  text_border_->set_has_focus(HasFocus());
+  PaintBackground(canvas);
+  PaintTextAndCursor(canvas);
+  if (textfield_->draw_border())
+    PaintBorder(canvas);
+}
+
+void NativeTextfieldViews::WillGainFocus() {
+}
+
+void NativeTextfieldViews::DidGainFocus() {
+  is_cursor_visible_ = true;
+  SchedulePaint();
+  // Start blinking cursor.
+  MessageLoop::current()->PostDelayedTask(
+      FROM_HERE,
+      cursor_timer_.NewRunnableMethod(&NativeTextfieldViews::UpdateCursor),
+      kCursorVisibleTimeMs);
+}
+
+void NativeTextfieldViews::WillLoseFocus() {
+  // Stop blinking cursor.
+  cursor_timer_.RevokeAll();
+  if (is_cursor_visible_) {
+    is_cursor_visible_ = false;
+    RepaintCursor();
+  }
+}
+
+void NativeTextfieldViews::DidChangeBounds(const gfx::Rect& previous,
+                                          const gfx::Rect& current) {
+  UpdateCursorBoundsAndTextOffset();
+}
+
+/////////////////////////////////////////////////////////////////
+// NativeTextfieldViews, NativeTextifieldWrapper overrides:
+
+string16 NativeTextfieldViews::GetText() const {
+  return model_->text();
+}
+
+void NativeTextfieldViews::UpdateText() {
+  bool changed = model_->SetText(textfield_->text());
+  UpdateCursorBoundsAndTextOffset();
+  SchedulePaint();
+  if (changed) {
+    Textfield::Controller* controller = textfield_->GetController();
+    if (controller)
+      controller->ContentsChanged(textfield_, GetText());
+  }
+}
+
+void NativeTextfieldViews::AppendText(const string16& text) {
+  if (text.empty())
+    return;
+  model_->Append(text);
+  UpdateCursorBoundsAndTextOffset();
+  SchedulePaint();
+
+  Textfield::Controller* controller = textfield_->GetController();
+  if (controller)
+    controller->ContentsChanged(textfield_, GetText());
+}
+
+string16 NativeTextfieldViews::GetSelectedText() const {
+  return model_->GetSelectedText();
+}
+
+void NativeTextfieldViews::SelectAll() {
+  model_->SelectAll();
+  SchedulePaint();
+}
+
+void NativeTextfieldViews::ClearSelection() {
+  model_->ClearSelection();
+  SchedulePaint();
+}
+
+void NativeTextfieldViews::UpdateBorder() {
+  if (textfield_->draw_border()) {
+    gfx::Insets insets = GetInsets();
+    textfield_->SetHorizontalMargins(insets.left(), insets.right());
+    textfield_->SetVerticalMargins(insets.top(), insets.bottom());
+  } else {
+    textfield_->SetHorizontalMargins(0, 0);
+    textfield_->SetVerticalMargins(0, 0);
+  }
+}
+
+void NativeTextfieldViews::UpdateTextColor() {
+  SchedulePaint();
+}
+
+void NativeTextfieldViews::UpdateBackgroundColor() {
+  // TODO(oshima): Background has to match the border's shape.
+  set_background(
+      Background::CreateSolidBackground(textfield_->background_color()));
+  SchedulePaint();
+}
+
+void NativeTextfieldViews::UpdateReadOnly() {
+  SchedulePaint();
+}
+
+void NativeTextfieldViews::UpdateFont() {
+  UpdateCursorBoundsAndTextOffset();
+}
+
+void NativeTextfieldViews::UpdateIsPassword() {
+  model_->set_is_password(textfield_->IsPassword());
+  UpdateCursorBoundsAndTextOffset();
+  SchedulePaint();
+}
+
+void NativeTextfieldViews::UpdateEnabled() {
+  SchedulePaint();
+}
+
+bool NativeTextfieldViews::IsPassword() {
+  // looks unnecessary. should we remove?
+  NOTREACHED();
+  return false;
+}
+
+gfx::Insets NativeTextfieldViews::CalculateInsets() {
+  return GetInsets();
+}
+
+void NativeTextfieldViews::UpdateHorizontalMargins() {
+  int left, right;
+  if (!textfield_->GetHorizontalMargins(&left, &right))
+    return;
+  gfx::Insets inset = GetInsets();
+
+  text_border_->SetInsets(inset.top(), left, inset.bottom(), right);
+  UpdateCursorBoundsAndTextOffset();
+}
+
+void NativeTextfieldViews::UpdateVerticalMargins() {
+  int top, bottom;
+  if (!textfield_->GetVerticalMargins(&top, &bottom))
+    return;
+  gfx::Insets inset = GetInsets();
+
+  text_border_->SetInsets(top, inset.left(), bottom, inset.right());
+  UpdateCursorBoundsAndTextOffset();
+}
+
+void NativeTextfieldViews::SetFocus() {
+  RequestFocus();
+}
+
+View* NativeTextfieldViews::GetView() {
+  return this;
+}
+
+gfx::NativeView NativeTextfieldViews::GetTestingHandle() const {
+  NOTREACHED();
+  return NULL;
+}
+
+bool NativeTextfieldViews::IsIMEComposing() const {
+  return false;
+}
+
+// static
+bool NativeTextfieldViews::IsTextfieldViewsEnabled() {
+#if defined(TOUCH_UI)
+  return true;
+#else
+  return textfield_view_enabled ||
+      CommandLine::ForCurrentProcess()->HasSwitch(
+          kEnableViewsBasedTextfieldSwitch);
+#endif
+}
+
+// static
+void NativeTextfieldViews::SetEnableTextfieldViews(bool enabled) {
+  textfield_view_enabled = enabled;
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+// NativeTextfieldViews private:
+
+const gfx::Font& NativeTextfieldViews::GetFont() const {
+  return textfield_->font();
+}
+
+SkColor NativeTextfieldViews::GetTextColor() const {
+  return textfield_->text_color();
+}
+
+void NativeTextfieldViews::UpdateCursor() {
+  is_cursor_visible_ = !is_cursor_visible_;
+  RepaintCursor();
+  MessageLoop::current()->PostDelayedTask(
+      FROM_HERE,
+      cursor_timer_.NewRunnableMethod(&NativeTextfieldViews::UpdateCursor),
+      is_cursor_visible_ ? kCursorVisibleTimeMs : kCursorInvisibleTimeMs);
+}
+
+void NativeTextfieldViews::RepaintCursor() {
+  gfx::Rect r = cursor_bounds_;
+  r.Inset(-1, -1, -1, -1);
+  SchedulePaint(r, false);
+}
+
+void NativeTextfieldViews::UpdateCursorBoundsAndTextOffset() {
+  if (bounds().IsEmpty())
+    return;
+
+  gfx::Insets insets = GetInsets();
+
+  int width = bounds().width() - insets.width();
+
+  // TODO(oshima): bidi
+  const gfx::Font& font = GetFont();
+  int full_width = font.GetStringWidth(UTF16ToWide(model_->GetVisibleText()));
+  cursor_bounds_ = model_->GetCursorBounds(font);
+  cursor_bounds_.set_y(cursor_bounds_.y() + insets.top());
+
+  int x_right = text_offset_ + cursor_bounds_.right();
+  int x_left = text_offset_ + cursor_bounds_.x();
+
+  if (full_width < width) {
+    // Show all text whenever the text fits to the size.
+    text_offset_ = 0;
+  } else if (x_right > width) {
+    // when the cursor overflows to the right
+    text_offset_ = width - cursor_bounds_.right();
+  } else if (x_left < 0) {
+    // when the cursor overflows to the left
+    text_offset_ = -cursor_bounds_.x();
+  } else if(full_width > width && text_offset_ + full_width < width) {
+    // when the cursor moves within the textfield with the text
+    // longer than the field.
+    text_offset_ = width - full_width;
+  } else {
+    // move cursor freely.
+  }
+  // shift cursor bounds to fit insets.
+  cursor_bounds_.set_x(cursor_bounds_.x() + text_offset_ + insets.left());
+}
+
+void NativeTextfieldViews::PaintTextAndCursor(gfx::Canvas* canvas) {
+  gfx::Insets insets = GetInsets();
+
+  canvas->Save();
+  canvas->ClipRectInt(insets.left(), insets.top(),
+                      width() - insets.width(), height() - insets.height());
+
+  // TODO(oshima): bidi support
+  // TODO(varunjain): re-implement this so only that dirty text is painted.
+  TextfieldViewsModel::TextFragments fragments;
+  model_->GetFragments(&fragments);
+  int x_offset = text_offset_ + insets.left();
+  int y = insets.top();
+  int text_height = height() - insets.height();
+  SkColor selection_color =
+      HasFocus() ? kFocusedSelectionColor : kUnfocusedSelectionColor;
+  SkColor text_color =
+      textfield_->read_only() ? kReadonlyTextColor : GetTextColor();
+
+  for (TextfieldViewsModel::TextFragments::const_iterator iter =
+           fragments.begin();
+       iter != fragments.end();
+       iter++) {
+    string16 text = model_->GetVisibleText((*iter).begin, (*iter).end);
+    // TODO(oshima): This does not give the accurate position due to
+    // kerning. Figure out how webkit does this with skia.
+    int width = GetFont().GetStringWidth(UTF16ToWide(text));
+
+    if ((*iter).selected) {
+      canvas->FillRectInt(selection_color, x_offset, y, width, text_height);
+      canvas->DrawStringInt(
+          UTF16ToWide(text), GetFont(), kSelectedTextColor,
+          x_offset, y, width, text_height);
+    } else {
+      canvas->DrawStringInt(
+          UTF16ToWide(text), GetFont(), text_color,
+          x_offset, y, width, text_height);
+    }
+    x_offset += width;
+  }
+  canvas->Restore();
+
+  if (textfield_->IsEnabled() && is_cursor_visible_ &&
+      !model_->HasSelection()) {
+    // Paint Cursor. Replace cursor is drawn as rectangle for now.
+    canvas->DrawRectInt(kCursorColor,
+                        cursor_bounds_.x(),
+                        cursor_bounds_.y(),
+                        insert_ ? 0 : cursor_bounds_.width(),
+                        cursor_bounds_.height());
+  }
+}
+
+bool NativeTextfieldViews::HandleKeyEvent(const KeyEvent& key_event) {
+  // TODO(oshima): handle IME.
+  if (key_event.GetType() == views::Event::ET_KEY_PRESSED) {
+    app::KeyboardCode key_code = key_event.GetKeyCode();
+    // TODO(oshima): shift-tab does not work. Figure out why and fix.
+    if (key_code == app::VKEY_TAB)
+      return false;
+    bool selection = key_event.IsShiftDown();
+    bool control = key_event.IsControlDown();
+    bool text_changed = false;
+    bool cursor_changed = false;
+    switch (key_code) {
+      case app::VKEY_A:
+        if (control) {
+          model_->SelectAll();
+          cursor_changed = true;
+        }
+        break;
+      case app::VKEY_RIGHT:
+        control ? model_->MoveCursorToNextWord(selection)
+            : model_->MoveCursorRight(selection);
+        cursor_changed = true;
+        break;
+      case app::VKEY_LEFT:
+        control ? model_->MoveCursorToPreviousWord(selection)
+            : model_->MoveCursorLeft(selection);
+        cursor_changed = true;
+        break;
+      case app::VKEY_END:
+        model_->MoveCursorToEnd(selection);
+        cursor_changed = true;
+        break;
+      case app::VKEY_HOME:
+        model_->MoveCursorToStart(selection);
+        cursor_changed = true;
+        break;
+      case app::VKEY_BACK:
+        text_changed = model_->Backspace();
+        cursor_changed = true;
+        break;
+      case app::VKEY_DELETE:
+        text_changed = model_->Delete();
+        break;
+      case app::VKEY_INSERT:
+        insert_ = !insert_;
+        cursor_changed = true;
+        break;
+      default:
+        break;
+    }
+    char16 print_char = GetPrintableChar(key_event);
+    if (!control && print_char) {
+      if (insert_)
+        model_->Insert(print_char);
+      else
+        model_->Replace(print_char);
+      text_changed = true;
+    }
+    if (text_changed) {
+      textfield_->SyncText();
+      Textfield::Controller* controller = textfield_->GetController();
+      if (controller)
+        controller->ContentsChanged(textfield_, GetText());
+    }
+    if (text_changed || cursor_changed) {
+      UpdateCursorBoundsAndTextOffset();
+      SchedulePaint();
+    }
+  }
+  return false;
+}
+
+char16 NativeTextfieldViews::GetPrintableChar(const KeyEvent& key_event) {
+  // TODO(oshima): IME, i18n support.
+  // This only works for UCS-2 characters.
+  app::KeyboardCode key_code = key_event.GetKeyCode();
+  bool shift = key_event.IsShiftDown() ^ key_event.IsCapsLockDown();
+  // TODO(oshima): We should have a utility function
+  // under app to convert a KeyboardCode to a printable character,
+  // probably in keyboard_code_conversion{.h, _x
+  switch (key_code) {
+    case app::VKEY_NUMPAD0:
+      return '0';
+    case app::VKEY_NUMPAD1:
+      return '1';
+    case app::VKEY_NUMPAD2:
+      return '2';
+    case app::VKEY_NUMPAD3:
+      return '3';
+    case app::VKEY_NUMPAD4:
+      return '4';
+    case app::VKEY_NUMPAD5:
+      return '5';
+    case app::VKEY_NUMPAD6:
+      return '6';
+    case app::VKEY_NUMPAD7:
+      return '7';
+    case app::VKEY_NUMPAD8:
+      return '8';
+    case app::VKEY_NUMPAD9:
+      return '9';
+    case app::VKEY_MULTIPLY:
+      return '*';
+    case app::VKEY_ADD:
+      return '+';
+    case app::VKEY_SUBTRACT:
+      return '-';
+    case app::VKEY_DECIMAL:
+      return '.';
+    case app::VKEY_DIVIDE:
+      return '/';
+    case app::VKEY_SPACE:
+      return ' ';
+    case app::VKEY_0:
+      return shift ? ')' : '0';
+    case app::VKEY_1:
+      return shift ? '!' : '1';
+    case app::VKEY_2:
+      return shift ? '@' : '2';
+    case app::VKEY_3:
+      return shift ? '#' : '3';
+    case app::VKEY_4:
+      return shift ? '$' : '4';
+    case app::VKEY_5:
+      return shift ? '%' : '5';
+    case app::VKEY_6:
+      return shift ? '^' : '6';
+    case app::VKEY_7:
+      return shift ? '&' : '7';
+    case app::VKEY_8:
+      return shift ? '*' : '8';
+    case app::VKEY_9:
+      return shift ? '(' : '9';
+
+    case app::VKEY_A:
+    case app::VKEY_B:
+    case app::VKEY_C:
+    case app::VKEY_D:
+    case app::VKEY_E:
+    case app::VKEY_F:
+    case app::VKEY_G:
+    case app::VKEY_H:
+    case app::VKEY_I:
+    case app::VKEY_J:
+    case app::VKEY_K:
+    case app::VKEY_L:
+    case app::VKEY_M:
+    case app::VKEY_N:
+    case app::VKEY_O:
+    case app::VKEY_P:
+    case app::VKEY_Q:
+    case app::VKEY_R:
+    case app::VKEY_S:
+    case app::VKEY_T:
+    case app::VKEY_U:
+    case app::VKEY_V:
+    case app::VKEY_W:
+    case app::VKEY_X:
+    case app::VKEY_Y:
+    case app::VKEY_Z:
+      return (shift ? 'A' : 'a') + (key_code - app::VKEY_A);
+    case app::VKEY_OEM_1:
+      return shift ? ':' : ';';
+    case app::VKEY_OEM_PLUS:
+      return shift ? '+' : '=';
+    case app::VKEY_OEM_COMMA:
+      return shift ? '<' : ',';
+    case app::VKEY_OEM_MINUS:
+      return shift ? '_' : '-';
+    case app::VKEY_OEM_PERIOD:
+      return shift ? '>' : '.';
+    case app::VKEY_OEM_2:
+      return shift ? '?' : '/';
+    case app::VKEY_OEM_3:
+      return shift ? '~' : '`';
+    case app::VKEY_OEM_4:
+      return shift ? '}' : ']';
+    case app::VKEY_OEM_5:
+      return shift ? '|' : '\\';
+    case app::VKEY_OEM_6:
+      return shift ? '{' : '[';
+    case app::VKEY_OEM_7:
+      return shift ? '"' : '\'';
+    default:
+      return 0;
+  }
+}
+
+size_t NativeTextfieldViews::FindCursorPosition(const gfx::Point& point) const {
+  // TODO(oshima): BIDI/i18n support.
+  gfx::Font font = GetFont();
+  gfx::Insets insets = GetInsets();
+  std::wstring text = UTF16ToWide(model_->GetVisibleText());
+  int left = 0;
+  int left_pos = 0;
+  int right = font.GetStringWidth(text);
+  int right_pos = text.length();
+
+  int x = point.x() - insets.left() - text_offset_;
+  if (x <= left) return left_pos;
+  if (x >= right) return right_pos;
+  // binary searching the cursor position.
+  // TODO(oshima): use the center of character instead of edge.
+  // Binary search may not work for language like arabic.
+  while (std::abs(static_cast<long>(right_pos - left_pos) > 1)) {
+    int pivot_pos = left_pos + (right_pos - left_pos) / 2;
+    int pivot = font.GetStringWidth(text.substr(0, pivot_pos));
+    if (pivot < x) {
+      left = pivot;
+      left_pos = pivot_pos;
+    } else if (pivot == x) {
+      return pivot_pos;
+    } else {
+      right = pivot;
+      right_pos = pivot_pos;
+    }
+  }
+  return left_pos;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// NativeTextfieldWrapper:
+
+// static
+NativeTextfieldWrapper* NativeTextfieldWrapper::CreateWrapper(
+    Textfield* field) {
+  if (NativeTextfieldViews::IsTextfieldViewsEnabled()) {
+    return new NativeTextfieldViews(field);
+  } else {
+    return new NativeTextfieldGtk(field);
+  }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+//
+// TextifieldBorder
+//
+///////////////////////////////////////////////////////////////////////////////
+
+NativeTextfieldViews::TextfieldBorder::TextfieldBorder()
+    : has_focus_(false),
+      insets_(4, 4, 4, 4) {
+}
+
+void NativeTextfieldViews::TextfieldBorder::Paint(
+    const View& view, gfx::Canvas* canvas) const {
+  SkRect rect;
+  rect.set(SkIntToScalar(0), SkIntToScalar(0),
+           SkIntToScalar(view.width()), SkIntToScalar(view.height()));
+  SkScalar corners[8] = {
+    // top-left
+    insets_.left(),
+    insets_.top(),
+    // top-right
+    insets_.right(),
+    insets_.top(),
+    // bottom-right
+    insets_.right(),
+    insets_.bottom(),
+    // bottom-left
+    insets_.left(),
+    insets_.bottom(),
+  };
+  SkPath path;
+  path.addRoundRect(rect, corners);
+  SkPaint paint;
+  paint.setStyle(SkPaint::kStroke_Style);
+  paint.setFlags(SkPaint::kAntiAlias_Flag);
+  // TODO(oshima): Copy what WebKit does for focused border.
+  paint.setColor(has_focus_ ? kFocusedBorderColor : kDefaultBorderColor);
+  paint.setStrokeWidth(has_focus_ ? 2 : 1);
+
+  canvas->AsCanvasSkia()->drawPath(path, paint);
+}
+
+void NativeTextfieldViews::TextfieldBorder::GetInsets(gfx::Insets* insets) const
+{
+  *insets = insets_;
+}
+
+void NativeTextfieldViews::TextfieldBorder::SetInsets(int top,
+                                                      int left,
+                                                      int bottom,
+                                                      int right) {
+  insets_.Set(top, left, bottom, right);
+}
+
+}  // namespace views