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   // Internal class name.
  20   static const char kViewClassName[];
  21
  22   // Amount the text is padded on the left/right side.
  23   static const int kHorizontalPadding;
  24
  25   // Amount of space reserved for the indicator and padding.
  26   static const int kSortIndicatorWidth;
  27
  28   explicit TableHeader(TableView* table);
  29   ~TableHeader() override;
  30
  31   const gfx::FontList& font_list() const { return font_list_; }
  32
  33   // views::View overrides.
  34   void Layout() override;
  35   void OnPaint(gfx::Canvas* canvas) override;
  36   const char* GetClassName() const override;
  37   gfx::Size GetPreferredSize() const override;
  38   gfx::NativeCursor GetCursor(const ui::MouseEvent& event) override;
  39   bool OnMousePressed(const ui::MouseEvent& event) override;
  40   bool OnMouseDragged(const ui::MouseEvent& event) override;
  41   void OnMouseReleased(const ui::MouseEvent& event) override;
  42   void OnMouseCaptureLost() override;
  43   void OnGestureEvent(ui::GestureEvent* event) override;
  44
  45  private:
  46   // Used to track the column being resized.
  47   struct ColumnResizeDetails {
  48     ColumnResizeDetails() : column_index(0), initial_x(0), initial_width(0) {}
  49
  50     // Index into table_->visible_columns() that is being resized.
  51     int column_index;
  52
  53     // X-coordinate of the mouse at the time the resize started.
  54     int initial_x;
  55
  56     // Width of the column when the drag started.
  57     int initial_width;
  58   };
  59
  60   // If not already resizing and |event| is over a resizable column starts
  61   // resizing.
  62   bool StartResize(const ui::LocatedEvent& event);
  63
  64   // Continues a resize operation. Does nothing if not in the process of
  65   // resizing.
  66   void ContinueResize(const ui::LocatedEvent& event);
  67
  68   // Toggles the sort order of the column at the location in |event|.
  69   void ToggleSortOrder(const ui::LocatedEvent& event);
  70
  71   // Returns the column to resize given the specified x-coordinate, or -1 if |x|
  72   // is not in the resize range of any columns.
  73   int GetResizeColumn(int x) const;
  74
  75   bool is_resizing() const { return resize_details_.get() != NULL; }
  76
  77   const gfx::FontList font_list_;
  78
  79   TableView* table_;
  80
  81   // If non-null a resize is in progress.
  82   scoped_ptr<ColumnResizeDetails> resize_details_;
  83
  84   DISALLOW_COPY_AND_ASSIGN(TableHeader);
  85 };
  86
  87 }  // namespace views
  88
  89 #endif  // UI_VIEWS_CONTROLS_TABLE_TABLE_HEADER_H_