views: Support longer tooltips.

ui/views/corewm/tooltip_aura.cc

 // Copyright 2013 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/views/corewm/tooltip_aura.h"
 
 #include "base/strings/string_split.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/screen.h"
 #include "ui/gfx/text_elider.h"
 #include "ui/gfx/text_utils.h"
 #include "ui/native_theme/native_theme.h"
 #include "ui/views/background.h"
 #include "ui/views/border.h"
 #include "ui/views/widget/widget.h"
 
 namespace {
 
-const int kTooltipHorizontalPadding = 3;
-
-// Max visual tooltip width. If a tooltip is greater than this width, it will
-// be wrapped.
-const int kTooltipMaxWidthPixels = 400;
-
-const size_t kMaxLines = 10;
-
-// TODO(derat): This padding is needed on Chrome OS devices but seems excessive
-// when running the same binary on a Linux workstation; presumably there's a
-// difference in font metrics.  Rationalize this.
-const int kTooltipVerticalPadding = 2;
-
 // FIXME: get cursor offset from actual cursor size.
 const int kCursorOffsetX = 10;
 const int kCursorOffsetY = 15;
 
 // Creates a widget of type TYPE_TOOLTIP
 views::Widget* CreateTooltipWidget(aura::Window* tooltip_window) {
   views::Widget* widget = new views::Widget;
   views::Widget::InitParams params;
   // For aura, since we set the type to TYPE_TOOLTIP, the widget will get
   // auto-parented to the right container.
@@ skipping 16 matching lines @@
       widget_(NULL),
       tooltip_window_(NULL) {
   label_.set_owned_by_client();
   label_.SetMultiLine(true);
 }
 
 TooltipAura::~TooltipAura() {
   DestroyWidget();
 }
 
-// static
-void TooltipAura::TrimTooltipToFit(const gfx::FontList& font_list,
-                                   int max_width,
-                                   base::string16* text,
-                                   int* width,
-                                   int* line_count) {
-  *width = 0;
-  *line_count = 0;
-
-  // Determine the available width for the tooltip.
-  int available_width = std::min(kTooltipMaxWidthPixels, max_width);
-
-  std::vector<base::string16> lines;
-  base::SplitString(*text, '\n', &lines);
-  std::vector<base::string16> result_lines;
-
-  // Format each line to fit.
-  for (std::vector<base::string16>::iterator l = lines.begin();
-       l != lines.end(); ++l) {
-    // We break the line at word boundaries, then stuff as many words as we can
-    // in the available width to the current line, and move the remaining words
-    // to a new line.
-    std::vector<base::string16> words;
-    base::SplitStringDontTrim(*l, ' ', &words);
-    int current_width = 0;
-    base::string16 line;
-    for (std::vector<base::string16>::iterator w = words.begin();
-         w != words.end(); ++w) {
-      base::string16 word = *w;
-      if (w + 1 != words.end())
-        word.push_back(' ');
-      int word_width = gfx::GetStringWidth(word, font_list);
-      if (current_width + word_width > available_width) {
-        // Current width will exceed the available width. Must start a new line.
-        if (!line.empty())
-          result_lines.push_back(line);
-        current_width = 0;
-        line.clear();
-      }
-      current_width += word_width;
-      line.append(word);
-    }
-    result_lines.push_back(line);
-  }
-
-  // Clamp number of lines to |kMaxLines|.
-  if (result_lines.size() > kMaxLines) {
-    result_lines.resize(kMaxLines);
-    // Add ellipses character to last line.
-    result_lines[kMaxLines - 1] = gfx::TruncateString(
-        result_lines.back(), result_lines.back().length() - 1, gfx::WORD_BREAK);
-  }
-  *line_count = result_lines.size();
-
-  // Flatten the result.
-  base::string16 result;
-  for (std::vector<base::string16>::iterator l = result_lines.begin();
-      l != result_lines.end(); ++l) {
-    if (!result.empty())
-      result.push_back('\n');
-    int line_width = gfx::GetStringWidth(*l, font_list);
-    // Since we only break at word boundaries, it could happen that due to some
-    // very long word, line_width is greater than the available_width. In such
-    // case, we simply truncate at available_width and add ellipses at the end.
-    if (line_width > available_width) {
-      *width = available_width;
-      result.append(gfx::ElideText(*l, font_list, available_width,
-                                   gfx::ELIDE_TAIL));
-    } else {
-      *width = std::max(*width, line_width);
-      result.append(*l);
-    }
-  }
-  *text = result;
-}
-
 int TooltipAura::GetMaxWidth(const gfx::Point& location) const {
-  // TODO(varunjain): implementation duplicated in tooltip_manager_aura. Figure
-  // out a way to merge.
   gfx::Screen* screen = gfx::Screen::GetScreenByType(screen_type_);
   gfx::Rect display_bounds(screen->GetDisplayNearestPoint(location).bounds());
-  return (display_bounds.width() + 1) / 2;
+  return display_bounds.width() * 3 / 4;
 }
 
 void TooltipAura::SetTooltipBounds(const gfx::Point& mouse_pos,
-                                   int tooltip_width,
-                                   int tooltip_height) {
-  gfx::Rect tooltip_rect(mouse_pos.x(), mouse_pos.y(), tooltip_width,
-                         tooltip_height);
+                                   const gfx::Size& tooltip_size) {
+  gfx::Rect tooltip_rect(mouse_pos, tooltip_size);
 
   tooltip_rect.Offset(kCursorOffsetX, kCursorOffsetY);
   gfx::Screen* screen = gfx::Screen::GetScreenByType(screen_type_);
   gfx::Rect display_bounds(screen->GetDisplayNearestPoint(mouse_pos).bounds());
 
   // If tooltip is out of bounds on the x axis, we simply shift it
   // horizontally by the offset.
   if (tooltip_rect.right() > display_bounds.right()) {
     int h_offset = tooltip_rect.right() - display_bounds.right();
     tooltip_rect.Offset(-h_offset, 0);
   }
 
   // If tooltip is out of bounds on the y axis, we flip it to appear above the
   // mouse cursor instead of below.
   if (tooltip_rect.bottom() > display_bounds.bottom())
-    tooltip_rect.set_y(mouse_pos.y() - tooltip_height);
+    tooltip_rect.set_y(mouse_pos.y() - tooltip_rect.height());
 
   tooltip_rect.AdjustToFit(display_bounds);
   widget_->SetBounds(tooltip_rect);
 }
 
 void TooltipAura::DestroyWidget() {
   if (widget_) {
     widget_->RemoveObserver(this);
     widget_->Close();
     widget_ = NULL;
   }
 }
 
 void TooltipAura::SetText(aura::Window* window,
                           const base::string16& tooltip_text,
                           const gfx::Point& location) {
   tooltip_window_ = window;
-  int max_width, line_count;
-  base::string16 trimmed_text(tooltip_text);
-  TrimTooltipToFit(label_.font_list(), GetMaxWidth(location), &trimmed_text,
-                   &max_width, &line_count);
-  label_.SetText(trimmed_text);
 
-  int width = max_width + 2 * kTooltipHorizontalPadding;
-  int height = label_.GetHeightForWidth(max_width) +
-      2 * kTooltipVerticalPadding;
+  label_.SetText(tooltip_text);
+  label_.SizeToFit(GetMaxWidth(location));
 
   if (!widget_) {
     widget_ = CreateTooltipWidget(tooltip_window_);
     widget_->SetContentsView(&label_);
     widget_->AddObserver(this);
   }
 
-  SetTooltipBounds(location, width, height);
+  SetTooltipBounds(location, label_.GetPreferredSize());
 
   ui::NativeTheme* native_theme = widget_->GetNativeTheme();
   label_.set_background(
       views::Background::CreateSolidBackground(
           native_theme->GetSystemColor(
               ui::NativeTheme::kColorId_TooltipBackground)));
 
   label_.SetAutoColorReadabilityEnabled(false);
   label_.SetEnabledColor(native_theme->GetSystemColor(
       ui::NativeTheme::kColorId_TooltipText));
@@ skipping 17 matching lines @@
 }
 
 void TooltipAura::OnWidgetDestroying(views::Widget* widget) {
   DCHECK_EQ(widget_, widget);
   widget_ = NULL;
   tooltip_window_ = NULL;
 }
 
 }  // namespace corewm
 }  // namespace views