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      1 // Copyright (c) 2012 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 "ui/views/ime/input_method_base.h"
      6 
      7 #include "base/logging.h"
      8 #include "ui/base/events/event.h"
      9 #include "ui/base/ime/text_input_client.h"
     10 #include "ui/views/view.h"
     11 #include "ui/views/widget/widget.h"
     12 
     13 namespace views {
     14 
     15 InputMethodBase::InputMethodBase() : delegate_(NULL), widget_(NULL) {}
     16 
     17 InputMethodBase::~InputMethodBase() {
     18   DetachFromWidget();
     19 }
     20 
     21 void InputMethodBase::SetDelegate(internal::InputMethodDelegate* delegate) {
     22   DCHECK(delegate);
     23   delegate_ = delegate;
     24 }
     25 
     26 void InputMethodBase::Init(Widget* widget) {
     27   DCHECK(widget);
     28   DCHECK(widget->GetFocusManager());
     29   DCHECK(!widget_) << "The input method is already initialized.";
     30 
     31   widget_ = widget;
     32   // Alert the InputMethod of the Widget's currently focused view.
     33   View* focused = widget->GetFocusManager()->GetFocusedView();
     34   if (focused)
     35     OnWillChangeFocus(NULL, focused);
     36   widget->GetFocusManager()->AddFocusChangeListener(this);
     37 }
     38 
     39 views::View* InputMethodBase::GetFocusedView() const {
     40   return widget_ ? widget_->GetFocusManager()->GetFocusedView() : NULL;
     41 }
     42 
     43 void InputMethodBase::OnTextInputTypeChanged(View* view) {}
     44 
     45 ui::TextInputClient* InputMethodBase::GetTextInputClient() const {
     46   return (widget_ && widget_->IsActive() && GetFocusedView()) ?
     47       GetFocusedView()->GetTextInputClient() : NULL;
     48 }
     49 
     50 ui::TextInputType InputMethodBase::GetTextInputType() const {
     51   ui::TextInputClient* client = GetTextInputClient();
     52   return client ? client->GetTextInputType() : ui::TEXT_INPUT_TYPE_NONE;
     53 }
     54 
     55 bool InputMethodBase::IsMock() const {
     56   return false;
     57 }
     58 
     59 void InputMethodBase::OnWillChangeFocus(View* focused_before, View* focused) {}
     60 
     61 void InputMethodBase::OnDidChangeFocus(View* focused_before, View* focused) {}
     62 
     63 bool InputMethodBase::IsViewFocused(View* view) const {
     64   return widget_ && widget_->IsActive() && view && GetFocusedView() == view;
     65 }
     66 
     67 bool InputMethodBase::IsTextInputTypeNone() const {
     68   return GetTextInputType() == ui::TEXT_INPUT_TYPE_NONE;
     69 }
     70 
     71 void InputMethodBase::OnInputMethodChanged() const {
     72   ui::TextInputClient* client = GetTextInputClient();
     73   if (client && client->GetTextInputType() != ui::TEXT_INPUT_TYPE_NONE)
     74     client->OnInputMethodChanged();
     75 }
     76 
     77 void InputMethodBase::DispatchKeyEventPostIME(const ui::KeyEvent& key) const {
     78   if (delegate_)
     79     delegate_->DispatchKeyEventPostIME(key);
     80 }
     81 
     82 bool InputMethodBase::GetCaretBoundsInWidget(gfx::Rect* rect) const {
     83   DCHECK(rect);
     84   ui::TextInputClient* client = GetTextInputClient();
     85   if (!client || client->GetTextInputType() == ui::TEXT_INPUT_TYPE_NONE)
     86     return false;
     87 
     88   gfx::Rect caret_bounds = client->GetCaretBounds();
     89   gfx::Point caret_origin = caret_bounds.origin();
     90   View::ConvertPointFromScreen(GetFocusedView(), &caret_origin);
     91   caret_bounds.set_origin(caret_origin);
     92   *rect = GetFocusedView()->ConvertRectToWidget(caret_bounds);
     93 
     94   // Convert coordinates if the focused view is inside a child Widget.
     95   if (GetFocusedView()->GetWidget() != widget_)
     96     return Widget::ConvertRect(GetFocusedView()->GetWidget(), widget_, rect);
     97   return true;
     98 }
     99 
    100 void InputMethodBase::DetachFromWidget() {
    101   if (!widget_)
    102     return;
    103 
    104   widget_->GetFocusManager()->RemoveFocusChangeListener(this);
    105   widget_ = NULL;
    106 }
    107 
    108 }  // namespace views
    109