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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 "views/widget/tooltip_manager.h" | |
6 | |
7 #include <vector> | |
8 | |
9 #include "base/string_split.h" | |
10 #include "base/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 *max_width = 0; | |
32 *line_count = 0; | |
33 | |
34 // Clamp the tooltip length to kMaxTooltipLength so that we don't | |
35 // accidentally DOS the user with a mega tooltip. | |
36 if (text->length() > kMaxTooltipLength) | |
37 *text = text->substr(0, kMaxTooltipLength); | |
38 | |
39 // Determine the available width for the tooltip. | |
40 int available_width = GetMaxWidth(x, y); | |
41 | |
42 // Split the string into at most kMaxLines lines. | |
43 std::vector<string16> lines; | |
44 base::SplitString(*text, '\n', &lines); | |
45 if (lines.size() > kMaxLines) | |
46 lines.resize(kMaxLines); | |
47 *line_count = static_cast<int>(lines.size()); | |
48 | |
49 // Format each line to fit. | |
50 gfx::Font font = GetDefaultFont(); | |
51 string16 result; | |
52 for (std::vector<string16>::iterator i = lines.begin(); i != lines.end(); | |
53 ++i) { | |
54 string16 elided_text = ui::ElideText(*i, font, available_width, false); | |
55 *max_width = std::max(*max_width, font.GetStringWidth(elided_text)); | |
56 if (!result.empty()) | |
57 result.push_back('\n'); | |
58 result.append(elided_text); | |
59 } | |
60 *text = result; | |
61 } | |
62 | |
63 } // namespace views | |
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