Implement learn more bubble on views.

chrome/browser/ui/views/autofill/info_bubble.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 "chrome/browser/ui/views/autofill/info_bubble.h"
+
+#include "base/i18n/rtl.h"
+#include "ui/gfx/point.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/size.h"
+#include "ui/gfx/text_constants.h"
+#include "ui/views/bubble/bubble_border.h"
+#include "ui/views/bubble/bubble_frame_view.h"
+#include "ui/views/controls/combobox/combobox.h"
+#include "ui/views/controls/label.h"
+#include "ui/views/layout/fill_layout.h"
+#include "ui/views/layout/layout_constants.h"
+#include "ui/views/widget/widget.h"
+
+namespace autofill {
+
+namespace {
+
+// The visible width of bubble borders (differs from the actual width) in px.
+const int kBubbleBorderVisibleWidth = 1;
+
+// The margin between the content of the error bubble and its border.
+const int kInfoBubbleHorizontalMargin = 14;
+const int kInfoBubbleVerticalMargin = 12;
+
+}  // namespace
+
+InfoBubble::InfoBubble(views::View* anchor, const base::string16& message)
+    : anchor_(anchor),
+      align_to_anchor_edge_(false),
+      preferred_width_(233),
+      show_above_anchor_(false) {
+  DCHECK(anchor_);
+  SetAnchorView(anchor_);
+
+  set_margins(gfx::Insets(kInfoBubbleVerticalMargin,
+                          kInfoBubbleHorizontalMargin,
+                          kInfoBubbleVerticalMargin,
+                          kInfoBubbleHorizontalMargin));
+  set_use_focusless(true);
+
+  SetLayoutManager(new views::FillLayout);
+  views::Label* label = new views::Label(message);
+  label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
+  label->SetMultiLine(true);
+  AddChildView(label);
+}
+
+InfoBubble::~InfoBubble() {
+  DCHECK(!widget_);
+}
+
+void InfoBubble::Show() {
+  // TODO(dbeam): currently we assume that combobox menus always show downward
+  // (which isn't true). If the invalid combobox is low enough on the screen,
+  // its menu will actually show upward and obscure the bubble. Figure out when
+  // this might happen and adjust |show_above_anchor_| accordingly. This is not
+  // that big of deal because it rarely happens in practice.
+  if (show_above_anchor_) {
+    set_arrow(ShouldArrowGoOnTheRight() ? views::BubbleBorder::BOTTOM_RIGHT :
+                                          views::BubbleBorder::BOTTOM_LEFT);
+  } else {
+    set_arrow(ShouldArrowGoOnTheRight() ? views::BubbleBorder::TOP_RIGHT :
+                                          views::BubbleBorder::TOP_LEFT);
+  }
+
+  widget_ = views::BubbleDelegateView::CreateBubble(this);
+  UpdatePosition();
+}
+
+void InfoBubble::Hide() {
+  views::Widget* widget = GetWidget();
+  if (widget && !widget->IsClosed())
+    widget->Close();
+}
+
+void InfoBubble::UpdatePosition() {
+  if (!widget_)
+    return;
+
+  if (!anchor_->GetVisibleBounds().IsEmpty()) {
+    SizeToContents();
+    widget_->SetVisibilityChangedAnimationsEnabled(true);
+    widget_->ShowInactive();
+  } else {
+    widget_->SetVisibilityChangedAnimationsEnabled(false);
+    widget_->Hide();
+  }
+}
+
+gfx::Size InfoBubble::GetPreferredSize() {
+  int pref_width = preferred_width_;
+  pref_width -= GetBubbleFrameView()->GetInsets().width();
+  pref_width -= 2 * kBubbleBorderVisibleWidth;
+  return gfx::Size(pref_width, GetHeightForWidth(pref_width));
+}
+
+gfx::Rect InfoBubble::GetBubbleBounds() {
+  gfx::Rect bounds = views::BubbleDelegateView::GetBubbleBounds();
+  gfx::Rect anchor_rect = GetAnchorRect();
+
+  if (show_above_anchor_)
+    bounds.set_y(anchor_rect.y() - GetBubbleFrameView()->height());
+  else
+    bounds.set_y(anchor_rect.bottom());
+
+  if (align_to_anchor_edge_) {
+    anchor_rect.Inset(-GetBubbleFrameView()->bubble_border()->GetInsets());
+    bounds.set_x(ShouldArrowGoOnTheRight() ?
+        anchor_rect.right() - bounds.width() - kBubbleBorderVisibleWidth :
+        anchor_rect.x() + kBubbleBorderVisibleWidth);
+  }
+
+  return bounds;
+}
+
+void InfoBubble::OnWidgetClosing(views::Widget* widget) {
+  if (widget == widget_)
+    widget_ = NULL;
+}
+
+bool InfoBubble::ShouldFlipArrowForRtl() const {
+  return false;
+}
+
+bool InfoBubble::ShouldArrowGoOnTheRight() {
+  views::View* container = anchor_->GetWidget()->non_client_view();
+  DCHECK(container->Contains(anchor_));
+
+  gfx::Point anchor_offset;
+  views::View::ConvertPointToTarget(anchor_, container, &anchor_offset);
+  anchor_offset.Offset(-container_insets_.left(), 0);
+
+  if (base::i18n::IsRTL()) {
+    int anchor_right_x = anchor_offset.x() + anchor_->width();
+    return anchor_right_x >= preferred_width_;
+  }
+
+  int container_width = container->width() - container_insets_.width();
+  return anchor_offset.x() + preferred_width_ > container_width;
+}
+
+}  // namespace autofill