initial version of auto VK switching.

chrome/browser/chromeos/input_method/virtual_keyboard_selector.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 "chrome/browser/chromeos/input_method/virtual_keyboard_selector.h"
+
+#include "base/logging.h"
+#include "base/stl_util-inl.h"
+
+namespace {
+const char kDefaultURLPath[] = "index.html";
+const size_t kDefaultURLPathLen = arraysize(kDefaultURLPath) - 1;
+}  // namespace
+
+namespace chromeos {
+namespace input_method {
+
+GURL VirtualKeyboard::GetURLForLayout(const std::string& layout) const {
+  if (layout.empty()) {
+    return url_;
+  }
+  url_canon::Replacements<char> replacements;
+  replacements.SetPath(
+      kDefaultURLPath, url_parse::Component(0, kDefaultURLPathLen));
+  // TODO(yusukes): would be better to URL-encode the |layout|?
+  replacements.SetRef(layout.c_str(), url_parse::Component(0, layout.length()));
+  return url_.ReplaceComponents(replacements);
+}
+
+VirtualKeyboardSelector::VirtualKeyboardSelector()
+    : current_(NULL) {
+}
+
+VirtualKeyboardSelector::~VirtualKeyboardSelector() {
+  STLDeleteElements(&keyboards_);
+}
+
+void VirtualKeyboardSelector::AddVirtualKeyboard(
+    const GURL& url,
+    const std::set<std::string>& supported_layouts,
+    bool is_system) {
+  const VirtualKeyboard* new_keyboard = new VirtualKeyboard(url,
+                                                            supported_layouts,
+                                                            is_system);
+  if (is_system) {
+    system_keyboards_.push_front(new_keyboard);
+  } else {
+    keyboards_.push_front(new_keyboard);
+  }
+  current_ =
+      keyboards_.empty() ? system_keyboards_.front() : keyboards_.front();
+}
+
+const VirtualKeyboard* VirtualKeyboardSelector::SelectVirtualKeyboard(
+    const std::string& layout) {
+  if (layout.empty()) {
+    LOG(ERROR) << "No layout is specified";
+    return NULL;
+  }
+
+  // First, check whether the current keyboard supports the layout.
+  if (current_ && current_->supported_layouts().count(layout) > 0) {
+    return current_;
+  }
+
+  const VirtualKeyboard* keyboard = SelectVirtualKeyboardInternal(layout);
+  if (!keyboard) {
+    VLOG(1) << "No virtual keyboard for " << layout << " is found";
+    return NULL;
+  }
+
+  current_ = keyboard;
+  return keyboard;
+}
+
+const VirtualKeyboard* VirtualKeyboardSelector::SelectVirtualKeyboardInternal(
+    const std::string& layout) {
+  std::list<const VirtualKeyboard*>::const_iterator iter;
+  for (iter = keyboards_.begin(); iter != keyboards_.end(); ++iter) {
+    if ((*iter)->supported_layouts().count(layout) > 0) {
+      return *iter;
+    }
+  }
+  for (iter = system_keyboards_.begin();
+       iter != system_keyboards_.end(); ++iter) {
+    if ((*iter)->supported_layouts().count(layout) > 0) {
+      return *iter;
+    }
+  }
+  return NULL;
+}
+
+}  // namespace input_method
+}  // namespace chromeos