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// Copyright (c) 2010 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 "views/widget/tooltip_manager.h"
#include <vector>
#include "app/text_elider.h"
#include "base/utf_string_conversions.h"
namespace views {
// Maximum number of characters we allow in a tooltip.
static const size_t kMaxTooltipLength = 1024;
// Maximum number of lines we allow in the tooltip.
static const size_t kMaxLines = 6;
// Breaks |text| along line boundaries, placing each line of text into lines.
static void SplitTooltipString(const std::wstring& text,
std::vector<std::wstring>* lines) {
size_t index = 0;
size_t next_index;
while ((next_index = text.find(TooltipManager::GetLineSeparator(), index))
!= std::wstring::npos && lines->size() < kMaxLines) {
lines->push_back(text.substr(index, next_index - index));
index = next_index + TooltipManager::GetLineSeparator().size();
}
if (next_index != text.size() && lines->size() < kMaxLines)
lines->push_back(text.substr(index, text.size() - index));
}
// static
void TooltipManager::TrimTooltipToFit(std::wstring* 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.
std::vector<std::wstring> lines;
SplitTooltipString(*text, &lines);
*line_count = static_cast<int>(lines.size());
// Format each line to fit.
gfx::Font font = GetDefaultFont();
std::wstring result;
for (std::vector<std::wstring>::iterator i = lines.begin(); i != lines.end();
++i) {
std::wstring elided_text = UTF16ToWideHack(gfx::ElideText(WideToUTF16Hack(
*i), font, available_width, false));
*max_width = std::max(*max_width, font.GetStringWidth(elided_text));
if (i == lines.begin() && i + 1 == lines.end()) {
*text = elided_text;
return;
}
if (!result.empty())
result.append(GetLineSeparator());
result.append(elided_text);
}
*text = result;
}
} // namespace views
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