ui/views/controls/table/table_header.h

   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
  12 namespace views {
  13
  14 class TableView;
  15
  16 // Views used to render the header for the table.
  17 class 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_