Add overflow indicator count on Windows.

chrome/browser/ui/panels/panel_overflow_strip.cc

 // Copyright (c) 2011 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 "chrome/browser/ui/panels/panel_overflow_strip.h"
 
 #include "base/logging.h"
 #include "chrome/browser/ui/panels/panel_manager.h"
 #include "chrome/browser/ui/panels/panel_mouse_watcher.h"
+#include "chrome/browser/ui/panels/panel_overflow_indicator.h"
 #include "chrome/browser/ui/panels/panel_strip.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/public/browser/notification_service.h"
 #include "ui/base/animation/slide_animation.h"
 
 namespace {
 // The width of the overflow area that is expanded to show more info, i.e.
 // titles, when the mouse hovers over the area.
 static const int kOverflowAreaHoverWidth = 200;
 
-// Maximium number of overflow panels allowed to be shown.
-const size_t kMaxVisibleOverflowPanelsAllowed = 6;
+// Maximium number of visible overflow panels when the overflow area is shrunk.
+const size_t kMaxVisibleOverflowPanelsOnShrunk = 6;
+
+// Height to display-area ratio that maximium number of visible overflow panels
+// cannot occupy more than when the overflow area is expanded.
+const double kHeightRatioForMaxVisibleOverflowPanelsOnExpanded = 0.67;
 
 // This value is experimental and subjective.
 const int kOverflowHoverAnimationMs = 180;
 }
 
 PanelOverflowStrip::PanelOverflowStrip(PanelManager* panel_manager)
     : panel_manager_(panel_manager),
       current_display_width_(0),
-      max_visible_panels_(kMaxVisibleOverflowPanelsAllowed),
+      max_visible_panels_on_shrunk_(kMaxVisibleOverflowPanelsOnShrunk),
+      max_visible_panels_on_expanded_(kMaxVisibleOverflowPanelsOnShrunk),
       are_overflow_titles_shown_(false),
       overflow_hover_animator_start_width_(0),
       overflow_hover_animator_end_width_(0) {
+  registrar_.Add(this, content::NOTIFICATION_APP_TERMINATING,
+                 content::NotificationService::AllSources());
 }
 
 PanelOverflowStrip::~PanelOverflowStrip() {
   DCHECK(panels_.empty());
+  DCHECK(!overflow_indicator_.get());
 }
 
 void PanelOverflowStrip::SetDisplayArea(const gfx::Rect& display_area) {
   if (display_area_ == display_area)
     return;
+  display_area_ = display_area;
 
-  display_area_ = display_area;
+  UpdateMaxVisibkePanelsOnExpanded();
   UpdateCurrentWidth();
 
   Refresh();
 }
 
+void PanelOverflowStrip::UpdateMaxVisibkePanelsOnExpanded() {
+  // The maximum number of visible overflow panels cannot occupy more than
+  // certain percentage of the display area height.
+  // Note that we need to delay the computation of this value if no overflow
+  // panel is added.
+  if (panels_.empty()) {
+    max_visible_panels_on_expanded_ = 0;
+  } else {
+    max_visible_panels_on_expanded_ =
+        kHeightRatioForMaxVisibleOverflowPanelsOnExpanded *
+        display_area_.height() /
+        panels_.front()->IconOnlySize().height();
+  }
+}
+
 void PanelOverflowStrip::UpdateCurrentWidth() {
   current_display_width_ = are_overflow_titles_shown_ ? kOverflowAreaHoverWidth
                                                       : display_area_.width();
 }
 
 void PanelOverflowStrip::AddPanel(Panel* panel) {
   // TODO(jianli): consider using other container to improve the perf for
   // inserting to the front. http://crbug.com/106222
   DCHECK_EQ(Panel::IN_OVERFLOW, panel->expansion_state());
   // Newly created panels that were temporarily in the panel strip
   // are added to the back of the overflow, whereas panels that are
   // bumped from the panel strip by other panels go to the front
   // of overflow.
   if (panel->has_temporary_layout()) {
     panel->set_has_temporary_layout(false);
     panels_.push_back(panel);
     DoRefresh(panels_.size() - 1, panels_.size() - 1);
   } else {
     panels_.insert(panels_.begin(), panel);
     Refresh();
   }
 
   if (panels_.size() == 1)
     panel_manager_->mouse_watcher()->AddObserver(this);
+
+  UpdateOverflowIndicator(current_display_width_);
 }
 
 bool PanelOverflowStrip::Remove(Panel* panel) {
   size_t index = 0;
   for (Panels::iterator iter = panels_.begin(); iter != panels_.end();
        ++iter, ++index) {
     if (*iter == panel) {
       panels_.erase(iter);
       DoRefresh(index, panels_.size() - 1);
       panel_manager_->OnPanelRemoved(panel);
-      if (panels_.empty())
+      if (panels_.empty()) {
         panel_manager_->mouse_watcher()->RemoveObserver(this);
+        overflow_indicator_.reset();
+      }
+      UpdateOverflowIndicator(current_display_width_);
       return true;
     }
   }
   return false;
 }
 
 void PanelOverflowStrip::RemoveAll() {
   // Make a copy of the iterator as closing panels can modify the vector.
   Panels panels_copy = panels_;
 
   // Start from the bottom to avoid reshuffling.
   for (Panels::reverse_iterator iter = panels_copy.rbegin();
        iter != panels_copy.rend(); ++iter)
     (*iter)->Close();
 }
 
 void PanelOverflowStrip::OnPanelExpansionStateChanged(
     Panel* panel, Panel::ExpansionState old_state) {
   DCHECK(panel->expansion_state() == Panel::IN_OVERFLOW);
   panel_manager_->panel_strip()->Remove(panel);
   AddPanel(panel);
   panel->SetAppIconVisibility(false);
 }
 
+void PanelOverflowStrip::OnPanelAttentionStateChanged(Panel* panel) {
+  DCHECK(panel->expansion_state() == Panel::IN_OVERFLOW);
+  UpdateOverflowIndicator(current_display_width_);
+}
+
 void PanelOverflowStrip::Refresh() {
   if (panels_.empty())
     return;
   DoRefresh(0, panels_.size() - 1);
 }
 
 void PanelOverflowStrip::DoRefresh(size_t start_index, size_t end_index) {
   if (panels_.empty() || start_index == panels_.size())
     return;
 
   DCHECK(end_index < panels_.size());
 
   for (size_t index = start_index; index <= end_index; ++index) {
     Panel* panel = panels_[index];
     gfx::Rect new_bounds = ComputeLayout(index,
                                          panel->IconOnlySize());
     panel->SetPanelBounds(new_bounds);
   }
 }
 
+void PanelOverflowStrip::UpdateOverflowIndicator(int width) {
+  if (!overflow_indicator_.get())
+    overflow_indicator_.reset(PanelOverflowIndicator::Create());
+
+  UpdateMaxVisibkePanelsOnExpanded();
+  int max_visible_panels = width > display_area_.width() ?
+      max_visible_panels_on_expanded_ : max_visible_panels_on_shrunk_;
+
+  // Setting the count to 0 will hide the indicator.
+  if (num_panels() <= max_visible_panels) {
+    overflow_indicator_->SetCount(0);
+    return;
+  }
+
+  // Update the bounds and count.
+  int height = overflow_indicator_->GetHeight();
+  overflow_indicator_->SetBounds(gfx::Rect(
+      display_area_.x(),
+      panels_[max_visible_panels - 1]->GetBounds().y() - height,
+      width,
+      height));
+  overflow_indicator_->SetCount(num_panels() - max_visible_panels);
+
+  // The overflow indicator is painted as drawing attention only when there is
+  // at least one hidden panel that is drawing attention.
+  bool is_drawing_attention = false;
+  for (int index = max_visible_panels; index < num_panels(); ++index) {
+    if (panels_[index]->IsDrawingAttention())
+      is_drawing_attention = true;
+  }
+  if (is_drawing_attention)
+    overflow_indicator_->DrawAttention();
+  else
+    overflow_indicator_->StopDrawingAttention();
+}
+
 gfx::Rect PanelOverflowStrip::ComputeLayout(
     size_t index, const gfx::Size& iconified_size) const {
   DCHECK(index != kInvalidPanelIndex);
 
   gfx::Rect bounds;
   int bottom = (index == 0) ? display_area_.bottom() :
       panels_[index - 1]->GetBounds().y();
   bounds.set_x(display_area_.x());
   bounds.set_y(bottom - iconified_size.height());
 
-  if (are_overflow_titles_shown_ ||
-      static_cast<int>(index) < max_visible_panels_) {
+  if (static_cast<int>(index) < max_visible_panels()) {
     bounds.set_width(current_display_width_);
     bounds.set_height(iconified_size.height());
   } else {
     // Invisible for overflow-on-overflow.
     bounds.set_width(0);
     bounds.set_height(0);
   }
 
   return bounds;
 }
 
 void PanelOverflowStrip::OnMouseMove(const gfx::Point& mouse_position) {
   bool show_overflow_titles = ShouldShowOverflowTitles(mouse_position);
   ShowOverflowTitles(show_overflow_titles);
 }
 
 bool PanelOverflowStrip::ShouldShowOverflowTitles(
     const gfx::Point& mouse_position) const {
   if (panels_.empty())
     return false;
 
   Panel* top_visible_panel;
   if (are_overflow_titles_shown_) {
     top_visible_panel = panels_.back();
   } else {
-    top_visible_panel = num_panels() >= max_visible_panels_ ?
-        panels_[max_visible_panels_ - 1] : panels_.back();
+    top_visible_panel = num_panels() >= max_visible_panels_on_shrunk_ ?
+        panels_[max_visible_panels_on_shrunk_ - 1] : panels_.back();
   }
   return mouse_position.x() <= display_area_.x() + current_display_width_ &&
          top_visible_panel->GetBounds().y() <= mouse_position.y() &&
          mouse_position.y() <= display_area_.bottom();
 }
 
 void PanelOverflowStrip::ShowOverflowTitles(bool show_overflow_titles) {
   if (show_overflow_titles == are_overflow_titles_shown_)
     return;
   are_overflow_titles_shown_ = show_overflow_titles;
@@ skipping 32 matching lines @@
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_PANEL_BOUNDS_ANIMATIONS_FINISHED,
       content::Source<PanelOverflowStrip>(this),
       content::NotificationService::NoDetails());
 }
 
 void PanelOverflowStrip::AnimationProgressed(const ui::Animation* animation) {
   int current_display_width = overflow_hover_animator_->CurrentValueBetween(
       overflow_hover_animator_start_width_, overflow_hover_animator_end_width_);
   bool end_of_shrinking = current_display_width == display_area_.width();
+  int max_visible_panels = end_of_shrinking ?
+      max_visible_panels_on_shrunk_ : max_visible_panels_on_expanded_;
 
   // Update each overflow panel.
-  for (size_t i = 0; i < panels_.size(); ++i) {
+  for (int i = 0; i < num_panels(); ++i) {
     Panel* overflow_panel = panels_[i];
     gfx::Rect bounds = overflow_panel->GetBounds();
 
-    if (static_cast<int>(i) >= max_visible_panels_ && end_of_shrinking) {
+    if (i >= max_visible_panels) {
       bounds.set_width(0);
       bounds.set_height(0);
     } else {
       bounds.set_width(current_display_width);
       bounds.set_height(overflow_panel->IconOnlySize().height());
     }
 
     overflow_panel->SetPanelBoundsInstantly(bounds);
   }
+
+  // Update the indicator.
+  UpdateOverflowIndicator(current_display_width);
+}
+
+void PanelOverflowStrip::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  DCHECK(type == content::NOTIFICATION_APP_TERMINATING);
+
+  // The overflow indicator needs to be disposed when the last browser is
+  // closed. Our destructor is called too late in the shutdown sequence.
+  if (overflow_indicator_.get())
+    overflow_indicator_.reset();
 }
 
 void PanelOverflowStrip::OnFullScreenModeChanged(bool is_full_screen) {
   for (size_t i = 0; i < panels_.size(); ++i)
     panels_[i]->FullScreenModeChanged(is_full_screen);
 }