| // 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" |
| |
| 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 = gfx::ElideText(*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 |