1 files changed, 63 insertions, 0 deletions
diff --git a/ui/views/widget/tooltip_manager.cc b/ui/views/widget/tooltip_manager.cc
new file mode 100644
index 0000000..7f4d193
--- /dev/null
+++ b/ui/views/widget/tooltip_manager.cc
@@ -0,0 +1,63 @@
+// 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 "ui/views/widget/tooltip_manager.h"
+
+#include <vector>
+
+#include "base/string_split.h"
+#include "base/utf_string_conversions.h"
+#include "ui/base/text/text_elider.h"
+
+namespace {
+
+// Maximum number of characters we allow in a tooltip.
+const size_t kMaxTooltipLength = 1024;
+
+// Maximum number of lines we allow in the tooltip.
+const size_t kMaxLines = 6;
+
+}  // namespace
+
+namespace views {
+
+// static
+void TooltipManager::TrimTooltipToFit(string16* text,
+                                      int* max_width,
+                                      int* line_count,
+                                      int x,
+                                      int y) {
+  *max_width = 0;
+  *line_count = 0;
+
+  // Clamp the tooltip length to kMaxTooltipLength so that we don't
+  // accidentally DOS the user with a mega tooltip.
+  if (text->length() > kMaxTooltipLength)
+    *text = text->substr(0, kMaxTooltipLength);
+
+  // Determine the available width for the tooltip.
+  int available_width = GetMaxWidth(x, y);
+
+  // Split the string into at most kMaxLines lines.
+  std::vector<string16> lines;
+  base::SplitString(*text, '\n', &lines);
+  if (lines.size() > kMaxLines)
+    lines.resize(kMaxLines);
+  *line_count = static_cast<int>(lines.size());
+
+  // Format each line to fit.
+  gfx::Font font = GetDefaultFont();
+  string16 result;
+  for (std::vector<string16>::iterator i = lines.begin(); i != lines.end();
+       ++i) {
+    string16 elided_text = ui::ElideText(*i, font, available_width, false);
+    *max_width = std::max(*max_width, font.GetStringWidth(elided_text));
+    if (!result.empty())
+      result.push_back('\n');
+    result.append(elided_text);
+  }
+  *text = result;
+}
+
+}  // namespace views