1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef UI_VIEWS_CONTROLS_TABLE_TABLE_HEADER_H_
6#define UI_VIEWS_CONTROLS_TABLE_TABLE_HEADER_H_
7
8#include "ui/gfx/font_list.h"
9#include "ui/views/view.h"
10#include "ui/views/views_export.h"
11
12namespace views {
13
14class TableView;
15
16// Views used to render the header for the table.
17class VIEWS_EXPORT TableHeader : public views::View {
18 public:
19  // Amount the text is padded on the left/right side.
20  static const int kHorizontalPadding;
21
22  // Amount of space reserved for the indicator and padding.
23  static const int kSortIndicatorWidth;
24
25  explicit TableHeader(TableView* table);
26  virtual ~TableHeader();
27
28  const gfx::FontList& font_list() const { return font_list_; }
29
30  // views::View overrides.
31  virtual void Layout() OVERRIDE;
32  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
33  virtual gfx::Size GetPreferredSize() const OVERRIDE;
34  virtual gfx::NativeCursor GetCursor(const ui::MouseEvent& event) OVERRIDE;
35  virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
36  virtual bool OnMouseDragged(const ui::MouseEvent& event) OVERRIDE;
37  virtual void OnMouseReleased(const ui::MouseEvent& event) OVERRIDE;
38  virtual void OnMouseCaptureLost() OVERRIDE;
39  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
40
41 private:
42  // Used to track the column being resized.
43  struct ColumnResizeDetails {
44    ColumnResizeDetails() : column_index(0), initial_x(0), initial_width(0) {}
45
46    // Index into table_->visible_columns() that is being resized.
47    int column_index;
48
49    // X-coordinate of the mouse at the time the resize started.
50    int initial_x;
51
52    // Width of the column when the drag started.
53    int initial_width;
54  };
55
56  // If not already resizing and |event| is over a resizable column starts
57  // resizing.
58  bool StartResize(const ui::LocatedEvent& event);
59
60  // Continues a resize operation. Does nothing if not in the process of
61  // resizing.
62  void ContinueResize(const ui::LocatedEvent& event);
63
64  // Toggles the sort order of the column at the location in |event|.
65  void ToggleSortOrder(const ui::LocatedEvent& event);
66
67  // Returns the column to resize given the specified x-coordinate, or -1 if |x|
68  // is not in the resize range of any columns.
69  int GetResizeColumn(int x) const;
70
71  bool is_resizing() const { return resize_details_.get() != NULL; }
72
73  const gfx::FontList font_list_;
74
75  TableView* table_;
76
77  // If non-null a resize is in progress.
78  scoped_ptr<ColumnResizeDetails> resize_details_;
79
80  DISALLOW_COPY_AND_ASSIGN(TableHeader);
81};
82
83}  // namespace views
84
85#endif  // UI_VIEWS_CONTROLS_TABLE_TABLE_HEADER_H_
86