Merge Chromium src@r53293

Change-Id: Ia79acf8670f385cee48c45b0a75371d8e950af34

1 files changed, 247 insertions, 0 deletions

diff --git a/chrome/browser/chromeos/panels/panel_scroller.cc b/chrome/browser/chromeos/panels/panel_scroller.cc
new file mode 100644
index 0000000..daaa3fc
--- /dev/null
+++ b/chrome/browser/chromeos/panels/panel_scroller.cc
@@ -0,0 +1,247 @@
+// Copyright (c) 2010 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/chromeos/panels/panel_scroller.h"
+
+#include "base/compiler_specific.h"
+#include "base/logging.h"
+#include "base/stl_util-inl.h"
+#include "base/string_util.h"
+#include "gfx/canvas.h"
+#include "chrome/browser/chromeos/panels/panel_scroller_container.h"
+#include "chrome/browser/chromeos/panels/panel_scroller_header.h"
+#include "views/widget/widget_gtk.h"
+
+struct PanelScroller::Panel {
+  PanelScrollerHeader* header;
+  PanelScrollerContainer* container;
+};
+
+PanelScroller::PanelScroller()
+    : views::View(),
+      divider_height_(18),
+      needs_layout_(true),
+      scroll_pos_(0),
+      ALLOW_THIS_IN_INITIALIZER_LIST(animation_(this)),
+      animated_scroll_begin_(0),
+      animated_scroll_end_(0) {
+  animation_.SetTweenType(Tween::EASE_IN_OUT);
+  animation_.SetSlideDuration(300);
+
+  Panel* panel = new Panel;
+  panel->header = new PanelScrollerHeader(this);
+  panel->header->set_title(ASCIIToUTF16("Email"));
+  panel->container = new PanelScrollerContainer(this, new views::View());
+  panels_.push_back(panel);
+
+  panel = new Panel;
+  panel->header = new PanelScrollerHeader(this);
+  panel->header->set_title(ASCIIToUTF16("Chat"));
+  panel->container = new PanelScrollerContainer(this, new views::View());
+  panels_.push_back(panel);
+
+  panel = new Panel;
+  panel->header = new PanelScrollerHeader(this);
+  panel->header->set_title(ASCIIToUTF16("Calendar"));
+  panel->container = new PanelScrollerContainer(this, new views::View());
+  panels_.push_back(panel);
+
+  panel = new Panel;
+  panel->header = new PanelScrollerHeader(this);
+  panel->header->set_title(ASCIIToUTF16("Recent searches"));
+  panel->container = new PanelScrollerContainer(this, new views::View());
+  panels_.push_back(panel);
+
+  panel = new Panel;
+  panel->header = new PanelScrollerHeader(this);
+  panel->header->set_title(ASCIIToUTF16("Pony news"));
+  panel->container = new PanelScrollerContainer(this, new views::View());
+  panels_.push_back(panel);
+
+  // Add the containers first since they're on the bottom.
+  AddChildView(panels_[0]->container);
+  AddChildView(panels_[1]->container);
+  AddChildView(panels_[2]->container);
+  AddChildView(panels_[3]->container);
+  AddChildView(panels_[4]->container);
+
+  AddChildView(panels_[0]->header);
+  AddChildView(panels_[1]->header);
+  AddChildView(panels_[2]->header);
+  AddChildView(panels_[3]->header);
+  AddChildView(panels_[4]->header);
+}
+
+PanelScroller::~PanelScroller() {
+  STLDeleteContainerPointers(panels_.begin(), panels_.end());
+}
+
+// static
+PanelScroller* PanelScroller::CreateWindow() {
+  views::WidgetGtk* widget =
+      new views::WidgetGtk(views::WidgetGtk::TYPE_WINDOW);
+  widget->set_delete_on_destroy(true);
+  widget->Init(NULL, gfx::Rect(0, 0, 100, 800));
+
+  PanelScroller* scroller = new PanelScroller();
+  widget->SetContentsView(scroller);
+
+  widget->Show();
+
+  return scroller;
+}
+
+void PanelScroller::ViewHierarchyChanged(bool is_add,
+                                         views::View* parent,
+                                         views::View* child) {
+  // Our child views changed without us knowing it. Stop the animation and mark
+  // us as dirty (needs_layout_ = true).
+  animation_.Stop();
+  needs_layout_ = true;
+}
+
+gfx::Size PanelScroller::GetPreferredSize() {
+  return gfx::Size(75, 200);
+}
+
+void PanelScroller::Layout() {
+/* TODO(brettw) this doesn't work for some reason.
+  if (!needs_layout_ || !animation_.IsShowing())
+    return;
+  needs_layout_ = false;*/
+
+  // The current location in the content that we're laying out. This is before
+  // scrolling is accounted for.
+  int cur_content_pos = 0;
+
+  // Number of pixels used by headers stuck to the top of the scroll area.
+  int top_header_pixel_count = 0;
+
+  int panel_count = static_cast<int>(panels_.size());
+  for (int i = 0; i < panel_count; i++) {
+    if (cur_content_pos < scroll_pos_ + top_header_pixel_count) {
+      // This panel is at least partially off the top. Put the header below the
+      // others already there.
+      panels_[i]->header->SetBounds(gfx::Rect(0, top_header_pixel_count,
+                                              width(), divider_height_));
+      top_header_pixel_count += divider_height_;
+
+    } else if (cur_content_pos > height() + scroll_pos_ -
+               (panel_count - i) * divider_height_) {
+      // When we've hit the bottom of the visible content, all the remaining
+      // headers will stack up at the bottom. Counting this header, there are
+      // (size() - i) left, which is used in the expression above.
+      int top = height() - (panel_count - i) * divider_height_;
+      panels_[i]->header->SetBounds(gfx::Rect(0, top,
+                                              width(), divider_height_));
+    } else {
+      // Normal header positioning in-flow.
+      panels_[i]->header->SetBounds(gfx::Rect(0, cur_content_pos - scroll_pos_,
+                                              width(), divider_height_));
+    }
+
+    cur_content_pos += divider_height_;
+
+    // Now position the content. It always goes in-flow ignoring any stacked
+    // up headers at the top or bottom.
+    int container_height = panels_[i]->container->GetPreferredSize().height();
+    panels_[i]->container->SetBounds(
+        gfx::Rect(0, cur_content_pos - scroll_pos_,
+                  width(), container_height));
+    cur_content_pos += container_height;
+  }
+}
+
+bool PanelScroller::OnMousePressed(const views::MouseEvent& event) {
+  return true;
+}
+
+bool PanelScroller::OnMouseDragged(const views::MouseEvent& event) {
+  return true;
+}
+
+void PanelScroller::OnMouseReleased(const views::MouseEvent& event,
+                                    bool canceled) {
+}
+
+void PanelScroller::HeaderClicked(PanelScrollerHeader* source) {
+  for (size_t i = 0; i < panels_.size(); i++) {
+    if (panels_[i]->header == source) {
+      ScrollToPanel(static_cast<int>(i));
+      return;
+    }
+  }
+  NOTREACHED() << "Invalid panel passed to HeaderClicked.";
+}
+
+void PanelScroller::ScrollToPanel(int index) {
+  int affected_panel_height =
+      panels_[index]->container->GetPreferredSize().height();
+
+  // The pixel size we need to reserve for the stuck headers.
+  int top_stuck_header_pixel_size = index * divider_height_;
+  int bottom_stuck_header_pixel_size =
+      (static_cast<int>(panels_.size()) - index - 1) * divider_height_;
+
+  // Compute the offset of the top of the panel to scroll to.
+  int space_above = 0;
+  for (int i = 0; i < index; i++) {
+    space_above += divider_height_ +
+        panels_[i]->container->GetPreferredSize().height();
+  }
+
+  // Compute the space below the top of the panel.
+  int space_below = 0;
+  for (int i = index; i < static_cast<int>(panels_.size()); i++) {
+    space_below += divider_height_ +
+        panels_[i]->container->GetPreferredSize().height();
+  }
+
+  // The scroll position of the top of the stuck headers is the space above
+  // minus the size of the headers stuck there.
+  int top_stuck_headers_scroll_pos = space_above - top_stuck_header_pixel_size;
+
+  // If the panel is already fully visible, do nothing.
+  if (scroll_pos_ <= top_stuck_headers_scroll_pos &&
+      space_above + divider_height_ + affected_panel_height -
+      bottom_stuck_header_pixel_size <= scroll_pos_ + height())
+    return;
+
+  // Compute the scroll position.
+  if (height() > space_below) {
+    // There's enough room for this panel and everything below it to fit on the
+    // screen.
+    animated_scroll_end_ = (space_above + space_below) - height();
+    if (animated_scroll_end_ > top_stuck_headers_scroll_pos)
+      animated_scroll_end_ = top_stuck_headers_scroll_pos;
+  } else if (space_above > scroll_pos_) {
+    // If we're going to be scrolling the content up, scroll just until the
+    // panel in question is fully visible.
+    animated_scroll_end_ = space_above +
+        divider_height_ + affected_panel_height +  // Size of this panel.
+        bottom_stuck_header_pixel_size -  // Leave room for these.
+        height();  // Available size in the window.
+    if (animated_scroll_end_ > top_stuck_headers_scroll_pos)
+      animated_scroll_end_ = top_stuck_headers_scroll_pos;
+  } else {
+    animated_scroll_end_ = top_stuck_headers_scroll_pos;
+  }
+
+  animated_scroll_begin_ = scroll_pos_;
+  if (animated_scroll_begin_ == animated_scroll_end_)
+    return;  // Nothing to animate.
+
+  // Start animating to the destination.
+  animation_.Reset();
+  animation_.Show();
+}
+
+void PanelScroller::AnimationProgressed(const Animation* animation) {
+  scroll_pos_ = static_cast<int>(
+      static_cast<double>(animated_scroll_end_ - animated_scroll_begin_) *
+      animation_.GetCurrentValue()) + animated_scroll_begin_;
+
+  Layout();
+  SchedulePaint();
+}