[Mac] Implement the system dictionary popup by implementing NSTextInput methods.

chrome/common/attributed_string_coder_mac.mm

+// 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/common/attributed_string_coder_mac.h"
+
+#include <AppKit/AppKit.h>
+
+#include "base/logging.h"
+#include "base/memory/scoped_nsobject.h"
+#include "base/sys_string_conversions.h"
+#include "base/utf_string_conversions.h"
+#include "content/common/common_param_traits.h"
+#include "content/common/view_messages.h"
+#include "ipc/ipc_message_utils.h"
+
+namespace mac {
+
+// static
+const AttributedStringCoder::EncodedString* AttributedStringCoder::Encode(
+    NSAttributedString* str) {
+  // Create the return value.
+  EncodedString* encoded_string =
+      new EncodedString(base::SysNSStringToUTF16([str string]));
+  // Iterate over all the attributes in the string.
+  NSUInteger length = [str length];
+  for (NSUInteger i = 0; i < length; ) {
+    NSRange effective_range;
+    NSDictionary* ns_attributes = [str attributesAtIndex:i
+                                          effectiveRange:&effective_range];
+    // Convert the attributes to IPC-friendly types.
+    FontAttribute attrs(ns_attributes, ui::Range(effective_range));
+    // Only encode the attributes if the filtered set contains font information.
+    if (attrs.ShouldEncode()) {
+      encoded_string->attributes()->push_back(attrs);
+    }
+    // Advance the iterator to the position outside of the effective range.
+    i = NSMaxRange(effective_range);
+  }
+  return encoded_string;
+}
+
+// static
+NSAttributedString* AttributedStringCoder::Decode(
+    const AttributedStringCoder::EncodedString* str) {
+  // Create the return value.
+  NSString* plain_text = base::SysUTF16ToNSString(str->string());
+  scoped_nsobject<NSMutableAttributedString> decoded_string(
+      [[NSMutableAttributedString alloc] initWithString:plain_text]);
+  // Iterate over all the encoded attributes, attaching each to the string.
+  const std::vector<FontAttribute> attributes = str->attributes();
+  for (std::vector<FontAttribute>::const_iterator it = attributes.begin();
+       it != attributes.end(); ++it) {
+    [decoded_string addAttributes:it->ToAttributesDictionary()
+                            range:it->effective_range().ToNSRange()];
+  }
+  return [decoded_string.release() autorelease];
+}
+
+// Data Types //////////////////////////////////////////////////////////////////
+
+AttributedStringCoder::EncodedString::EncodedString(string16 string)
+    : string_(string) {
+}
+
+AttributedStringCoder::EncodedString::EncodedString()
+    : string_() {
+}
+
+AttributedStringCoder::EncodedString::~EncodedString() {
+}
+
+AttributedStringCoder::FontAttribute::FontAttribute(NSDictionary* dict,
+                                                    ui::Range effective_range)
+    : font_descriptor_(),
+      effective_range_(effective_range) {
+  NSFont* font = [dict objectForKey:NSFontAttributeName];
+  if (font) {
+    font_descriptor_ = FontDescriptor(font);
+  }
+}
+
+AttributedStringCoder::FontAttribute::FontAttribute(FontDescriptor font,
+                                                    ui::Range range)
+    : font_descriptor_(font),
+      effective_range_(range) {
+}
+
+AttributedStringCoder::FontAttribute::FontAttribute()
+    : font_descriptor_(),
+      effective_range_() {
+}
+
+AttributedStringCoder::FontAttribute::~FontAttribute() {
+}
+
+NSDictionary* AttributedStringCoder::FontAttribute::ToAttributesDictionary(
+    void) const {
+  DCHECK(ShouldEncode());
+  NSFont* font = font_descriptor_.ToNSFont();
+  return [NSDictionary dictionaryWithObject:font forKey:NSFontAttributeName];
+}
+
+bool AttributedStringCoder::FontAttribute::ShouldEncode() const {
+  return !font_descriptor_.font_name.empty();
+}
+
+}  // namespace mac
+
+// IPC ParamTraits specialization //////////////////////////////////////////////
+
+namespace IPC {
+
+using mac::AttributedStringCoder;
+
+void ParamTraits<AttributedStringCoder::EncodedString>::Write(
+    Message* m, const param_type& p) {
+  WriteParam(m, p.string());
+  WriteParam(m, p.attributes());
+}
+
+bool ParamTraits<AttributedStringCoder::EncodedString>::Read(
+    const Message* m, void** iter, param_type* p) {
+  bool success = true;
+
+  string16 result;
+  success &= ReadParam(m, iter, &result);
+  *p = AttributedStringCoder::EncodedString(result);
+
+  success &= ReadParam(m, iter, p->attributes());
+  return success;
+}
+
+void ParamTraits<AttributedStringCoder::EncodedString>::Log(
+    const param_type& p, std::string* l) {
+  l->append(UTF16ToUTF8(p.string()));
+}
+
+void ParamTraits<AttributedStringCoder::FontAttribute>::Write(
+    Message* m, const param_type& p) {
+  WriteParam(m, p.font_descriptor());
+  WriteParam(m, p.effective_range());
+}
+
+bool ParamTraits<AttributedStringCoder::FontAttribute>::Read(
+    const Message* m, void** iter, param_type* p) {
+  bool success = true;
+
+  FontDescriptor font;
+  success &= ReadParam(m, iter, &font);
+
+  ui::Range range;
+  success &= ReadParam(m, iter, &range);
+
+  if (success) {
+    *p = AttributedStringCoder::FontAttribute(font, range);
+  }
+  return success;
+}
+
+void ParamTraits<AttributedStringCoder::FontAttribute>::Log(
+    const param_type& p, std::string* l) {
+}
+
+}  // namespace IPC