views: add a "footnote view" to DialogClientView.

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BUG=170511

Review URL: https://codereview.chromium.org/12047102

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@180585 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 61 insertions, 3 deletions

diff --git a/ui/views/window/dialog_client_view.cc b/ui/views/window/dialog_client_view.cc
index df2c83b..ba16988 100644
--- a/ui/views/window/dialog_client_view.cc
+++ b/ui/views/window/dialog_client_view.cc
@@ -119,6 +119,7 @@ DialogClientView::DialogClientView(Widget* owner, View* contents_view)
       cancel_button_(NULL),
       default_button_(NULL),
       extra_view_(NULL),
+      footnote_view_(NULL),
       size_extra_view_height_to_buttons_(false),
       notified_delegate_(false),
       listening_to_focus_(false),
@@ -222,9 +223,8 @@ void DialogClientView::UpdateDialogButtons() {
   if (buttons & ui::DIALOG_BUTTON_OK)
     UpdateButtonHelper(ok_button_, dd, ui::DIALOG_BUTTON_OK);
 
-  if (buttons & ui::DIALOG_BUTTON_CANCEL) {
+  if (buttons & ui::DIALOG_BUTTON_CANCEL)
     UpdateButtonHelper(cancel_button_, dd, ui::DIALOG_BUTTON_CANCEL);
-  }
 
   LayoutDialogButtons();
   SchedulePaint();
@@ -318,6 +318,10 @@ void DialogClientView::PaintChildren(gfx::Canvas* canvas) {
 void DialogClientView::Layout() {
   if (has_dialog_buttons())
     LayoutDialogButtons();
+
+  if (footnote_view_)
+    LayoutFootnoteView();
+
   LayoutContentsView();
 }
 
@@ -335,6 +339,7 @@ void DialogClientView::ViewHierarchyChanged(bool is_add, View* parent,
     // The "extra view" must be created and installed after the contents view
     // has been inserted into the view hierarchy.
     CreateExtraView();
+    CreateFootnoteView();
     UpdateDialogButtons();
     Layout();
   }
@@ -365,6 +370,13 @@ gfx::Size DialogClientView::GetPreferredSize() {
     }
   }
   prefsize.Enlarge(0, button_height);
+
+  if (footnote_view_) {
+    gfx::Size footnote_size = footnote_view_->GetPreferredSize();
+    prefsize.Enlarge(0, footnote_size.height());
+    prefsize.set_width(std::max(prefsize.width(), footnote_size.width()));
+  }
+
   return prefsize;
 }
 
@@ -481,10 +493,17 @@ int DialogClientView::GetDialogButtonsAreaHeight() const {
       style_params_.button_vedge_margin;
 }
 
+int DialogClientView::GetFootnoteViewHeight() const {
+  return footnote_view_ ? footnote_view_->GetPreferredSize().height() : 0;
+}
+
 void DialogClientView::LayoutDialogButtons() {
   gfx::Rect lb = GetContentsBounds();
   gfx::Rect extra_bounds;
   int bottom_y = lb.bottom() - style_params_.button_vedge_margin;
+  if (footnote_view_)
+    bottom_y -= footnote_view_->GetPreferredSize().height();
+
   int button_height = GetButtonsHeight();
   if (cancel_button_) {
     gfx::Size ps = cancel_button_->GetPreferredSize();
@@ -521,11 +540,21 @@ void DialogClientView::LayoutDialogButtons() {
 
 void DialogClientView::LayoutContentsView() {
   gfx::Rect lb = GetContentsBounds();
-  lb.set_height(std::max(0, lb.height() - GetDialogButtonsAreaHeight()));
+  lb.set_height(std::max(0, lb.height() - GetDialogButtonsAreaHeight() -
+                            GetFootnoteViewHeight()));
   contents_view()->SetBoundsRect(lb);
   contents_view()->Layout();
 }
 
+void DialogClientView::LayoutFootnoteView() {
+  int height = GetFootnoteViewHeight();
+  gfx::Rect bounds = GetContentsBounds();
+  bounds.set_y(bounds.height() - height);
+  bounds.set_height(height);
+  footnote_view_->SetBoundsRect(bounds);
+  footnote_view_->Layout();
+}
+
 void DialogClientView::CreateExtraView() {
   View* extra_view = GetDialogDelegate()->GetExtraView();
   if (extra_view && !extra_view_) {
@@ -537,6 +566,15 @@ void DialogClientView::CreateExtraView() {
   }
 }
 
+void DialogClientView::CreateFootnoteView() {
+  if (footnote_view_)
+    return;
+
+  footnote_view_ = GetDialogDelegate()->GetFootnoteView();
+  if (footnote_view_)
+    AddChildView(footnote_view_);
+}
+
 DialogDelegate* DialogClientView::GetDialogDelegate() const {
   return GetWidget()->widget_delegate()->AsDialogDelegate();
 }
diff --git a/ui/views/window/dialog_client_view.h b/ui/views/window/dialog_client_view.h
index 6550819..c8136d4 100644
--- a/ui/views/window/dialog_client_view.h
+++ b/ui/views/window/dialog_client_view.h
@@ -119,9 +119,14 @@ class VIEWS_EXPORT DialogClientView : public ClientView,
   // and the spacing between bottom of buttons to end of the dialog.
   int GetDialogButtonsAreaHeight() const;
 
+  // Returns the preferred height of |footnote_view_|, or 0 if that view is
+  // NULL.
+  int GetFootnoteViewHeight() const;
+
   // Position and size various sub-views.
   void LayoutDialogButtons();
   void LayoutContentsView();
+  void LayoutFootnoteView();
 
   // Makes the specified button the default button.
   void SetDefaultButton(TextButton* button);
@@ -131,6 +136,9 @@ class VIEWS_EXPORT DialogClientView : public ClientView,
   // Create and add the extra view, if supplied by the delegate.
   void CreateExtraView();
 
+  // Creates and adds the footnote view, if supplied by the delegate.
+  void CreateFootnoteView();
+
   // Returns the DialogDelegate for the window.
   DialogDelegate* GetDialogDelegate() const;
 
@@ -153,6 +161,9 @@ class VIEWS_EXPORT DialogClientView : public ClientView,
   // The button-level extra view, NULL unless the dialog delegate supplies one.
   View* extra_view_;
 
+  // The view that resides beneath the dialog buttons, or NULL.
+  View* footnote_view_;
+
   // See description of DialogDelegate::GetSizeExtraViewHeightToButtons for
   // details on this.
   bool size_extra_view_height_to_buttons_;
diff --git a/ui/views/window/dialog_delegate.cc b/ui/views/window/dialog_delegate.cc
index d9b0517..80606fc 100644
--- a/ui/views/window/dialog_delegate.cc
+++ b/ui/views/window/dialog_delegate.cc
@@ -92,6 +92,10 @@ bool DialogDelegate::GetSizeExtraViewHeightToButtons() {
   return false;
 }
 
+View* DialogDelegate::GetFootnoteView() {
+  return NULL;
+}
+
 bool DialogDelegate::Cancel() {
   return true;
 }
diff --git a/ui/views/window/dialog_delegate.h b/ui/views/window/dialog_delegate.h
index 174648b..a039e8f 100644
--- a/ui/views/window/dialog_delegate.h
+++ b/ui/views/window/dialog_delegate.h
@@ -74,6 +74,11 @@ class VIEWS_EXPORT DialogDelegate : public WidgetDelegate {
   // max(extra_view preferred height, buttons preferred height).
   virtual bool GetSizeExtraViewHeightToButtons();
 
+  // Like GetExtraView, this function can be overridden to display an auxiliary
+  // view in the dialog. This view will be placed beneath the dialog buttons and
+  // will extend all the way from the left to the right of the dialog.
+  virtual View* GetFootnoteView();
+
   // For Dialog boxes, if there is a "Cancel" button or no dialog button at all,
   // this is called when the user presses the "Cancel" button or the Close
   // button on the window or in the system menu, or presses the Esc key.