Add views::RichLabel, a class which creates multi-line text with mixed

ui/views/controls/rich_label.cc

+// 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/rich_label.h"
+
+#include <deque>
+
+#include "base/string_util.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/base/text/text_elider.h"
+#include "ui/views/controls/label.h"
+#include "ui/views/controls/link.h"
+
+namespace views {
+
+RichLabel::RichLabel(const std::vector<string16>& text,
+                     const std::vector<GURL>& urls)
+    : strings_(text),
+      urls_(urls) {}
+
+RichLabel::~RichLabel() {}
+
+gfx::Size RichLabel::GetPreferredSize() {
+  return gfx::Size(100, 100);
+}
+
+void RichLabel::Layout() {
+  RemoveAllChildViews(true);
+  gfx::Font font =
+      ResourceBundle::GetSharedInstance().GetFont(ResourceBundle::BaseFont);
+  gfx::Rect total_bounds(GetLocalBounds());
+  int height = font.GetHeight();
+  int line = 0;
+  int x = 0;
+
+  std::deque<string16> queue(strings_.begin(), strings_.end());
+  int url_index = 0;
+
+  while (!queue.empty()) {
+    string16 string = queue.front();
+    // Don't put whitespace at beginning of line.
+    if (x == 0)
+      TrimWhitespace(string, TRIM_LEADING, &string);
+    queue.pop_front();
+    gfx::Rect bounds = total_bounds;
+    bounds.set_height(2 * height);
+    bounds.set_x(x);
+    bounds.set_width(bounds.width() - x);
+
+    std::vector<string16> substrings;
+    ui::ElideRectangleText(string,
+                           font,
+                           bounds.width(), bounds.height(),
+                           ui::IGNORE_LONG_WORDS,
+                           &substrings);
+
+    View* view = NULL;
+    if (urls_[url_index].is_empty())
+      view = new Label(string);
+    else if (substrings.size() == 1)
+      view = new Link(string);
+
+    if (view) {
+      AddChildView(view);
+      view->SetBoundsRect(gfx::Rect(gfx::Point(x, line * height),
+                                    view->GetPreferredSize()));
+      x += view->bounds().width();
+
+      if (substrings.size() == 1) {
+        // It all fit on one line.
+        url_index++;
+      } else {
+        // Only part of the string fit on this line. Wrap the remainder to a new
+        // line.
+        queue.push_front(string.substr(substrings[0].size()));
+        line++;
+        x = 0;
+      }
+    } else {
+      // There may be a link that's too long to fit on an entire line. Don't get
+      // stuck in a loop; just ignore that link.
+      if (x != 0)
+        queue.push_front(string);
+      x = 0;
+      line++;
+    }
+  }
+}
+
+}  // namespace views