1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "ui/views/widget/tooltip_manager.h" 6 7 #include <vector> 8 9 #include "base/strings/string_split.h" 10 #include "base/strings/utf_string_conversions.h" 11 #include "ui/base/text/text_elider.h" 12 13 namespace { 14 15 // Maximum number of characters we allow in a tooltip. 16 const size_t kMaxTooltipLength = 1024; 17 18 // Maximum number of lines we allow in the tooltip. 19 const size_t kMaxLines = 6; 20 21 } // namespace 22 23 namespace views { 24 25 // static 26 void TooltipManager::TrimTooltipToFit(string16* text, 27 int* max_width, 28 int* line_count, 29 int x, 30 int y, 31 gfx::NativeView context) { 32 *max_width = 0; 33 *line_count = 0; 34 35 // Clamp the tooltip length to kMaxTooltipLength so that we don't 36 // accidentally DOS the user with a mega tooltip. 37 if (text->length() > kMaxTooltipLength) 38 *text = text->substr(0, kMaxTooltipLength); 39 40 // Determine the available width for the tooltip. 41 int available_width = GetMaxWidth(x, y, context); 42 43 // Split the string into at most kMaxLines lines. 44 std::vector<string16> lines; 45 base::SplitString(*text, '\n', &lines); 46 if (lines.size() > kMaxLines) 47 lines.resize(kMaxLines); 48 *line_count = static_cast<int>(lines.size()); 49 50 // Format each line to fit. 51 gfx::Font font = GetDefaultFont(); 52 string16 result; 53 for (std::vector<string16>::iterator i = lines.begin(); i != lines.end(); 54 ++i) { 55 string16 elided_text = 56 ui::ElideText(*i, font, available_width, ui::ELIDE_AT_END); 57 *max_width = std::max(*max_width, font.GetStringWidth(elided_text)); 58 if (!result.empty()) 59 result.push_back('\n'); 60 result.append(elided_text); 61 } 62 *text = result; 63 } 64 65 } // namespace views 66
