components/html_viewer/ime_controller.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/html_viewer/ime_controller.h"
   6
   7 #include "components/html_viewer/blink_input_events_type_converters.h"
   8 #include "components/html_viewer/blink_text_input_type_converters.h"
   9 #include "components/mus/public/cpp/view.h"
  10 #include "third_party/WebKit/public/web/WebInputEvent.h"
  11 #include "third_party/WebKit/public/web/WebWidget.h"
  12
  13 namespace html_viewer {
  14
  15 ImeController::ImeController(mus::View* view, blink::WebWidget* widget)
  16     : view_(view), widget_(widget) {}
  17
  18 ImeController::~ImeController() {}
  19
  20 void ImeController::ResetInputMethod() {
  21   // TODO(penghuang): Reset IME.
  22 }
  23
  24 void ImeController::DidHandleGestureEvent(const blink::WebGestureEvent& event,
  25                                           bool event_cancelled) {
  26   // Called when a gesture event is handled.
  27   if (event_cancelled)
  28     return;
  29
  30   if (event.type == blink::WebInputEvent::GestureTap) {
  31     const bool show_ime = true;
  32     UpdateTextInputState(show_ime);
  33   } else if (event.type == blink::WebInputEvent::GestureLongPress) {
  34     // Only show IME if the textfield contains text.
  35     const bool show_ime = !widget_->textInputInfo().value.isEmpty();
  36     UpdateTextInputState(show_ime);
  37   }
  38 }
  39
  40 void ImeController::DidUpdateTextOfFocusedElementByNonUserInput() {
  41   // Called when value of focused textfield gets dirty, e.g. value is
  42   // modified by script, not by user input.
  43   const bool show_ime = false;
  44   UpdateTextInputState(show_ime);
  45 }
  46
  47 void ImeController::ShowImeIfNeeded() {
  48   // Request the browser to show the IME for current input type.
  49   const bool show_ime = true;
  50   UpdateTextInputState(show_ime);
  51 }
  52
  53 void ImeController::UpdateTextInputState(bool show_ime) {
  54   blink::WebTextInputInfo new_info = widget_->textInputInfo();
  55   // Only show IME if the focused element is editable.
  56   show_ime = show_ime && new_info.type != blink::WebTextInputTypeNone;
  57   if (show_ime || text_input_info_ != new_info) {
  58     text_input_info_ = new_info;
  59     mojo::TextInputStatePtr state = mojo::TextInputState::New();
  60     state->type = mojo::ConvertTo<mojo::TextInputType>(new_info.type);
  61     state->flags = new_info.flags;
  62     state->text = mojo::String::From(new_info.value.utf8());
  63     state->selection_start = new_info.selectionStart;
  64     state->selection_end = new_info.selectionEnd;
  65     state->composition_start = new_info.compositionStart;
  66     state->composition_end = new_info.compositionEnd;
  67     if (show_ime)
  68       view_->SetImeVisibility(true, state.Pass());
  69     else
  70       view_->SetTextInputState(state.Pass());
  71   }
  72 }
  73
  74 }  // namespace html_viewer