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// 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/strings/string_split.h"
#include "base/strings/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,
gfx::NativeView context) {
*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, context);
// 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, ui::ELIDE_AT_END);
*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
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