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ui/views/controls/scroll_view.h

Index: ui/views/controls/scroll_view.h
diff --git a/ui/views/controls/scroll_view.h b/ui/views/controls/scroll_view.h
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-// Copyright (c) 2012 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.
-
-#ifndef UI_VIEWS_CONTROLS_SCROLL_VIEW_H_
-#define UI_VIEWS_CONTROLS_SCROLL_VIEW_H_
-
-#include <string>
-
-#include "base/compiler_specific.h"
-#include "ui/views/controls/scrollbar/scroll_bar.h"
-
-namespace views {
-
-/////////////////////////////////////////////////////////////////////////////
-//
-// ScrollView class
-//
-// A ScrollView is used to make any View scrollable. The view is added to
-// a viewport which takes care of clipping.
-//
-// In this current implementation both horizontal and vertical scrollbars are
-// added as needed.
-//
-// The scrollview supports keyboard UI and mousewheel.
-//
-/////////////////////////////////////////////////////////////////////////////
-
-class VIEWS_EXPORT ScrollView : public View, public ScrollBarController {
- public:
-  static const char kViewClassName[];
-
-  ScrollView();
-
-  virtual ~ScrollView();
-
-  // Creates a ScrollView with a theme specific border.
-  static ScrollView* CreateScrollViewWithBorder();
-
-  // Set the contents. Any previous contents will be deleted. The contents
-  // is the view that needs to scroll.
-  void SetContents(View* a_view);
-  const View* contents() const { return contents_; }
-  View* contents() { return contents_; }
-
-  // Sets the header, deleting the previous header.
-  void SetHeader(View* header);
-
-  // Returns the visible region of the content View.
-  gfx::Rect GetVisibleRect() const;
-
-  void set_hide_horizontal_scrollbar(bool visible) {
-    hide_horizontal_scrollbar_ = visible;
-  }
-
-  // Turns this scroll view into a bounded scroll view, with a fixed height.
-  // By default, a ScrollView will stretch to fill its outer container.
-  void ClipHeightTo(int min_height, int max_height);
-
-  // Returns whether or not the ScrollView is bounded (as set by ClipHeightTo).
-  bool is_bounded() const { return max_height_ >= 0 && min_height_ >= 0; }
-
-  // Retrieves the width/height of scrollbars. These return 0 if the scrollbar
-  // has not yet been created.
-  int GetScrollBarWidth() const;
-  int GetScrollBarHeight() const;
-
-  // Returns the horizontal/vertical scrollbar. This may return NULL.
-  const ScrollBar* horizontal_scroll_bar() const { return horiz_sb_; }
-  const ScrollBar* vertical_scroll_bar() const { return vert_sb_; }
-
-  // Customize the scrollbar design. ScrollView takes the ownership of the
-  // specified ScrollBar. |horiz_sb| and |vert_sb| cannot be NULL.
-  void SetHorizontalScrollBar(ScrollBar* horiz_sb);
-  void SetVerticalScrollBar(ScrollBar* vert_sb);
-
-  // View overrides:
-  virtual gfx::Size GetPreferredSize() const override;
-  virtual int GetHeightForWidth(int width) const override;
-  virtual void Layout() override;
-  virtual bool OnKeyPressed(const ui::KeyEvent& event) override;
-  virtual bool OnMouseWheel(const ui::MouseWheelEvent& e) override;
-  virtual void OnMouseEntered(const ui::MouseEvent& event) override;
-  virtual void OnMouseExited(const ui::MouseEvent& event) override;
-  virtual void OnGestureEvent(ui::GestureEvent* event) override;
-  virtual const char* GetClassName() const override;
-
-  // ScrollBarController overrides:
-  virtual void ScrollToPosition(ScrollBar* source, int position) override;
-  virtual int GetScrollIncrement(ScrollBar* source,
-                                 bool is_page,
-                                 bool is_positive) override;
-
- private:
-  FRIEND_TEST_ALL_PREFIXES(ScrollViewTest, CornerViewVisibility);
-  class Viewport;
-
-  // Used internally by SetHeader() and SetContents() to reset the view.  Sets
-  // |member| to |new_view|. If |new_view| is non-null it is added to |parent|.
-  void SetHeaderOrContents(View* parent, View* new_view, View** member);
-
-  // Scrolls the minimum amount necessary to make the specified rectangle
-  // visible, in the coordinates of the contents view. The specified rectangle
-  // is constrained by the bounds of the contents view. This has no effect if
-  // the contents have not been set.
-  void ScrollContentsRegionToBeVisible(const gfx::Rect& rect);
-
-  // Computes the visibility of both scrollbars, taking in account the view port
-  // and content sizes.
-  void ComputeScrollBarsVisibility(const gfx::Size& viewport_size,
-                                   const gfx::Size& content_size,
-                                   bool* horiz_is_shown,
-                                   bool* vert_is_shown) const;
-
-  // Shows or hides the scrollbar/corner_view based on the value of
-  // |should_show|.
-  void SetControlVisibility(View* control, bool should_show);
-
-  // Update the scrollbars positions given viewport and content sizes.
-  void UpdateScrollBarPositions();
-
-  // The current contents and its viewport. |contents_| is contained in
-  // |contents_viewport_|.
-  View* contents_;
-  View* contents_viewport_;
-
-  // The current header and its viewport. |header_| is contained in
-  // |header_viewport_|.
-  View* header_;
-  View* header_viewport_;
-
-  // Horizontal scrollbar.
-  ScrollBar* horiz_sb_;
-
-  // Vertical scrollbar.
-  ScrollBar* vert_sb_;
-
-  // Corner view.
-  View* corner_view_;
-
-  // The min and max height for the bounded scroll view. These are negative
-  // values if the view is not bounded.
-  int min_height_;
-  int max_height_;
-
-  // If true, never show the horizontal scrollbar (even if the contents is wider
-  // than the viewport).
-  bool hide_horizontal_scrollbar_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScrollView);
-};
-
-// VariableRowHeightScrollHelper is intended for views that contain rows of
-// varying height. To use a VariableRowHeightScrollHelper create one supplying
-// a Controller and delegate GetPageScrollIncrement and GetLineScrollIncrement
-// to the helper. VariableRowHeightScrollHelper calls back to the
-// Controller to determine row boundaries.
-class VariableRowHeightScrollHelper {
- public:
-  // The origin and height of a row.
-  struct RowInfo {
-    RowInfo(int origin, int height) : origin(origin), height(height) {}
-
-    // Origin of the row.
-    int origin;
-
-    // Height of the row.
-    int height;
-  };
-
-  // Used to determine row boundaries.
-  class Controller {
-   public:
-    // Returns the origin and size of the row at the specified location.
-    virtual VariableRowHeightScrollHelper::RowInfo GetRowInfo(int y) = 0;
-  };
-
-  // Creates a new VariableRowHeightScrollHelper. Controller is
-  // NOT deleted by this VariableRowHeightScrollHelper.
-  explicit VariableRowHeightScrollHelper(Controller* controller);
-  virtual ~VariableRowHeightScrollHelper();
-
-  // Delegate the View methods of the same name to these. The scroll amount is
-  // determined by querying the Controller for the appropriate row to scroll
-  // to.
-  int GetPageScrollIncrement(ScrollView* scroll_view,
-                             bool is_horizontal, bool is_positive);
-  int GetLineScrollIncrement(ScrollView* scroll_view,
-                             bool is_horizontal, bool is_positive);
-
- protected:
-  // Returns the row information for the row at the specified location. This
-  // calls through to the method of the same name on the controller.
-  virtual RowInfo GetRowInfo(int y);
-
- private:
-  Controller* controller_;
-
-  DISALLOW_COPY_AND_ASSIGN(VariableRowHeightScrollHelper);
-};
-
-// FixedRowHeightScrollHelper is intended for views that contain fixed height
-// height rows. To use a FixedRowHeightScrollHelper delegate
-// GetPageScrollIncrement and GetLineScrollIncrement to it.
-class FixedRowHeightScrollHelper : public VariableRowHeightScrollHelper {
- public:
-  // Creates a FixedRowHeightScrollHelper. top_margin gives the distance from
-  // the top of the view to the first row, and may be 0. row_height gives the
-  // height of each row.
-  FixedRowHeightScrollHelper(int top_margin, int row_height);
-
- protected:
-  // Calculates the bounds of the row from the top margin and row height.
-  virtual RowInfo GetRowInfo(int y) override;
-
- private:
-  int top_margin_;
-  int row_height_;
-
-  DISALLOW_COPY_AND_ASSIGN(FixedRowHeightScrollHelper);
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_CONTROLS_SCROLL_VIEW_H_