root/ui/views/controls/prefix_selector.cc

DEFINITIONS

1. ConvertRectToScreen
2. OnViewBlur
3. SetCompositionText
4. ConfirmCompositionText
5. ClearCompositionText
6. InsertText
7. InsertChar
8. GetAttachedWindow
9. GetTextInputType
10. GetTextInputMode
11. CanComposeInline
12. GetCaretBounds
13. GetCompositionCharacterBounds
14. HasCompositionText
15. GetTextRange
16. GetCompositionTextRange
17. GetSelectionRange
18. SetSelectionRange
19. DeleteRange
20. GetTextFromRange
21. OnInputMethodChanged
22. ChangeTextDirectionAndLayoutAlignment
23. ExtendSelectionAndDelete
24. EnsureCaretInRect
25. OnCandidateWindowShown
26. OnCandidateWindowUpdated
27. OnCandidateWindowHidden
28. OnTextInput
29. TextAtRowMatchesText
30. ClearText

// Copyright 2013 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 "ui/views/controls/prefix_selector.h"

#include "base/i18n/case_conversion.h"
#include "ui/base/ime/text_input_type.h"
#include "ui/gfx/range/range.h"
#include "ui/views/controls/prefix_delegate.h"
#include "ui/views/widget/widget.h"

namespace views {

namespace {

const int64 kTimeBeforeClearingMS = 1000;

void ConvertRectToScreen(const views::View* src, gfx::Rect* r) {
  DCHECK(src);

  gfx::Point new_origin = r->origin();
  views::View::ConvertPointToScreen(src, &new_origin);
  r->set_origin(new_origin);
}

}  // namespace

PrefixSelector::PrefixSelector(PrefixDelegate* delegate)
    : prefix_delegate_(delegate) {
}

PrefixSelector::~PrefixSelector() {
}

void PrefixSelector::OnViewBlur() {
  ClearText();
}

void PrefixSelector::SetCompositionText(
    const ui::CompositionText& composition) {
}

void PrefixSelector::ConfirmCompositionText() {
}

void PrefixSelector::ClearCompositionText() {
}

void PrefixSelector::InsertText(const base::string16& text) {
  OnTextInput(text);
}

void PrefixSelector::InsertChar(base::char16 ch, int flags) {
  OnTextInput(base::string16(1, ch));
}

gfx::NativeWindow PrefixSelector::GetAttachedWindow() const {
  return prefix_delegate_->GetWidget()->GetNativeWindow();
}

ui::TextInputType PrefixSelector::GetTextInputType() const {
  return ui::TEXT_INPUT_TYPE_TEXT;
}

ui::TextInputMode PrefixSelector::GetTextInputMode() const {
  return ui::TEXT_INPUT_MODE_DEFAULT;
}

bool PrefixSelector::CanComposeInline() const {
  return false;
}

gfx::Rect PrefixSelector::GetCaretBounds() const {
  gfx::Rect rect(prefix_delegate_->GetVisibleBounds().origin(), gfx::Size());
  // TextInputClient::GetCaretBounds is expected to return a value in screen
  // coordinates.
  ConvertRectToScreen(prefix_delegate_, &rect);
  return rect;
}

bool PrefixSelector::GetCompositionCharacterBounds(uint32 index,
                                                   gfx::Rect* rect) const {
  // TextInputClient::GetCompositionCharacterBounds is expected to fill |rect|
  // in screen coordinates and GetCaretBounds returns screen coordinates.
  *rect = GetCaretBounds();
  return false;
}

bool PrefixSelector::HasCompositionText() const {
  return false;
}

bool PrefixSelector::GetTextRange(gfx::Range* range) const {
  *range = gfx::Range();
  return false;
}

bool PrefixSelector::GetCompositionTextRange(gfx::Range* range) const {
  *range = gfx::Range();
  return false;
}

bool PrefixSelector::GetSelectionRange(gfx::Range* range) const {
  *range = gfx::Range();
  return false;
}

bool PrefixSelector::SetSelectionRange(const gfx::Range& range) {
  return false;
}

bool PrefixSelector::DeleteRange(const gfx::Range& range) {
  return false;
}

bool PrefixSelector::GetTextFromRange(const gfx::Range& range,
                                        base::string16* text) const {
  return false;
}

void PrefixSelector::OnInputMethodChanged() {
  ClearText();
}

bool PrefixSelector::ChangeTextDirectionAndLayoutAlignment(
    base::i18n::TextDirection direction) {
  return true;
}

void PrefixSelector::ExtendSelectionAndDelete(size_t before, size_t after) {
}

void PrefixSelector::EnsureCaretInRect(const gfx::Rect& rect) {
}

void PrefixSelector::OnCandidateWindowShown() {
}

void PrefixSelector::OnCandidateWindowUpdated() {
}

void PrefixSelector::OnCandidateWindowHidden() {
}

void PrefixSelector::OnTextInput(const base::string16& text) {
  // Small hack to filter out 'tab' and 'enter' input, as the expectation is
  // that they are control characters and will not affect the currently-active
  // prefix.
  if (text.length() == 1 &&
      (text[0] == L'\t' || text[0] == L'\r' || text[0] == L'\n'))
    return;

  const int row_count = prefix_delegate_->GetRowCount();
  if (row_count == 0)
    return;

  // Search for |text| if it has been a while since the user typed, otherwise
  // append |text| to |current_text_| and search for that. If it has been a
  // while search after the current row, otherwise search starting from the
  // current row.
  int row = std::max(0, prefix_delegate_->GetSelectedRow());
  const base::TimeTicks now(base::TimeTicks::Now());
  if ((now - time_of_last_key_).InMilliseconds() < kTimeBeforeClearingMS) {
    current_text_ += text;
  } else {
    current_text_ = text;
    if (prefix_delegate_->GetSelectedRow() >= 0)
      row = (row + 1) % row_count;
  }
  time_of_last_key_ = now;

  const int start_row = row;
  const base::string16 lower_text(base::i18n::ToLower(current_text_));
  do {
    if (TextAtRowMatchesText(row, lower_text)) {
      prefix_delegate_->SetSelectedRow(row);
      return;
    }
    row = (row + 1) % row_count;
  } while (row != start_row);
}

bool PrefixSelector::TextAtRowMatchesText(int row,
                                          const base::string16& lower_text) {
  const base::string16 model_text(
      base::i18n::ToLower(prefix_delegate_->GetTextForRow(row)));
  return (model_text.size() >= lower_text.size()) &&
      (model_text.compare(0, lower_text.size(), lower_text) == 0);
}

void PrefixSelector::ClearText() {
  current_text_.clear();
  time_of_last_key_ = base::TimeTicks();
}

}  // namespace views