Revert 188637 "Added text line limits to collapsed and expanded ..."

ui/message_center/views/bounded_label.cc

-// Copyright (c) 2012 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/message_center/views/bounded_label.h"
-
-#include <limits>
-
-#include "base/string_util.h"
-#include "base/utf_string_conversions.h"
-#include "ui/base/text/text_elider.h"
-#include "ui/gfx/canvas.h"
-
-namespace message_center {
-
-BoundedLabel::BoundedLabel(string16 text, size_t max_lines)
-    : views::Label(text, gfx::Font()) {
-  Init(max_lines);
-}
-
-BoundedLabel::BoundedLabel(string16 text, gfx::Font font, size_t max_lines)
-    : views::Label(text, font) {
-  Init(max_lines);
-}
-
-BoundedLabel::~BoundedLabel() {
-}
-
-void BoundedLabel::SetMaxLines(size_t lines) {
-  is_preferred_lines_valid_ = false;
-  is_text_size_valid_ = false;
-  max_lines_ = lines;
-}
-
-size_t BoundedLabel::GetMaxLines() {
-  return max_lines_;
-}
-
-size_t BoundedLabel::GetPreferredLines() {
-  if (!is_preferred_lines_valid_) {
-    int wrap_width = width() - GetInsets().width();
-    int unlimited_lines = std::numeric_limits<size_t>::max();
-    preferred_lines_ = SplitLines(wrap_width, unlimited_lines).size();
-    is_preferred_lines_valid_ = true;
-  }
-  return preferred_lines_;
-}
-
-int BoundedLabel::GetHeightForWidth(int width) {
-  gfx::Insets insets = GetInsets();
-  return GetTextHeightForWidth(width - insets.width()) + insets.height();
-}
-
-gfx::Size BoundedLabel::GetTextSize() const {
-  if (!is_text_size_valid_) {
-    text_size_.set_width(width() - GetInsets().width());
-    text_size_.set_height(GetTextHeightForWidth(text_size_.width()));
-    is_text_size_valid_ = true;
-  }
-  return text_size_;
-}
-
-void BoundedLabel::OnBoundsChanged(const gfx::Rect& previous_bounds) {
-  is_preferred_lines_valid_ = false;
-  is_text_size_valid_ = false;
-}
-
-void BoundedLabel::PaintText(gfx::Canvas* canvas,
-                             const string16& paint_text,
-                             const gfx::Rect& text_bounds,
-                             int flags) {
-  gfx::Insets insets = GetInsets();
-  gfx::Rect bounds(gfx::Point(insets.left(), insets.top()), GetTextSize());
-  string16 text = JoinString(SplitLines(bounds.width(), max_lines_), '\n');
-  views::Label::PaintText(canvas, text, bounds, GetTextFlags());
-}
-
-void BoundedLabel::Init(size_t max_lines) {
-  SetMultiLine(true);
-  SetAllowCharacterBreak(true);
-  SetElideBehavior(views::Label::ELIDE_AT_END);
-  max_lines_ = max_lines;
-  is_preferred_lines_valid_ = false;
-  is_text_size_valid_ = false;
-}
-
-int BoundedLabel::GetTextFlags() const {
-  int flags = gfx::Canvas::MULTI_LINE | gfx::Canvas::CHARACTER_BREAK;
-
-  // We can't use subpixel rendering if the background is non-opaque.
-  if (SkColorGetA(background_color()) != 0xFF)
-    flags |= gfx::Canvas::NO_SUBPIXEL_RENDERING;
-
-  if (directionality_mode() == AUTO_DETECT_DIRECTIONALITY) {
-    base::i18n::TextDirection direction =
-        base::i18n::GetFirstStrongCharacterDirection(text());
-    if (direction == base::i18n::RIGHT_TO_LEFT)
-      flags |= gfx::Canvas::FORCE_RTL_DIRECTIONALITY;
-    else
-      flags |= gfx::Canvas::FORCE_LTR_DIRECTIONALITY;
-  }
-
-  switch (horizontal_alignment()) {
-    case gfx::ALIGN_LEFT:
-      flags |= gfx::Canvas::TEXT_ALIGN_LEFT;
-      break;
-    case gfx::ALIGN_CENTER:
-      flags |= gfx::Canvas::TEXT_ALIGN_CENTER;
-      break;
-    case gfx::ALIGN_RIGHT:
-      flags |= gfx::Canvas::TEXT_ALIGN_RIGHT;
-      break;
-  }
-
-  return flags;
-}
-
-int BoundedLabel::GetTextHeightForWidth(int width) const {
-  int height = font().GetHeight();
-  width = std::max(width, 0);
-  string16 text = JoinString(SplitLines(width, max_lines_), '\n');
-  gfx::Canvas::SizeStringInt(text, font(), &width, &height, GetTextFlags());
-  return height;
-}
-
-std::vector<string16> BoundedLabel::SplitLines(int width,
-                                               size_t max_lines) const {
-  // Adjust max_lines so (max_lines + 1) * line_height <= INT_MAX, then use the
-  // adjusted max_lines to get a max_height of (max_lines + 1) * line_height.
-  size_t max_height = std::numeric_limits<int>::max();
-  size_t line_height = std::max(font().GetHeight(), 2);  // At least 2 pixels!
-  max_lines = std::min(max_lines, max_height / line_height - 1);
-  max_height = (max_lines + 1) * line_height;
-
-  // Split. Do not use ui::WRAP_LONG_WORDS instead of ui::IGNORE_LONG_WORDS
-  // below as this may cause ui::ElideRectangleText() to go into an infinite
-  // loop for small width values.
-  std::vector<string16> lines;
-  ui::ElideRectangleText(text(), font(), width, max_height,
-                         ui::IGNORE_LONG_WORDS, &lines);
-
-  // Elide if necessary.
-  if (lines.size() > max_lines) {
-    // Add an ellipsis to the last line. If this ellipsis makes the last line
-    // too wide, that line will be further elided by the ui::ElideText below,
-    // so for example "ABC" could become "ABC..." here and "AB..." below.
-    string16 last = lines[max_lines - 1] + UTF8ToUTF16(ui::kEllipsis);
-    lines.resize(max_lines - 1);
-    lines.push_back((font().GetStringWidth(last) > width) ?
-                    ui::ElideText(last, font(), width, ui::ELIDE_AT_END) :
-                    last);
-  }
-
-  return lines;
-}
-
-}  // namespace message_center