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 <memory> 9 10 #include "base/macros.h" 11 #include "ui/gfx/font_list.h" 12 #include "ui/views/controls/table/table_view.h" 13 #include "ui/views/view.h" 14 #include "ui/views/views_export.h" 15 16 namespace views { 17 18 // Views used to render the header for the table. 19 class VIEWS_EXPORT TableHeader : public views::View { 20 public: 21 // Internal class name. 22 static const char kViewClassName[]; 23 24 // Amount the text is padded on the left/right side. 25 static const int kHorizontalPadding; 26 27 // Amount of space reserved for the indicator and padding. 28 static const int kSortIndicatorWidth; 29 30 explicit TableHeader(TableView* table); 31 ~TableHeader() override; 32 font_list()33 const gfx::FontList& font_list() const { return font_list_; } 34 35 void ResizeColumnViaKeyboard(int index, 36 TableView::AdvanceDirection direction); 37 38 // views::View overrides. 39 void OnPaint(gfx::Canvas* canvas) override; 40 const char* GetClassName() const override; 41 gfx::Size CalculatePreferredSize() const override; 42 bool GetNeedsNotificationWhenVisibleBoundsChange() const override; 43 void OnVisibleBoundsChanged() override; 44 void AddedToWidget() override; 45 gfx::NativeCursor GetCursor(const ui::MouseEvent& event) override; 46 bool OnMousePressed(const ui::MouseEvent& event) override; 47 bool OnMouseDragged(const ui::MouseEvent& event) override; 48 void OnMouseReleased(const ui::MouseEvent& event) override; 49 void OnMouseCaptureLost() override; 50 void OnGestureEvent(ui::GestureEvent* event) override; 51 void OnThemeChanged() override; 52 53 private: 54 // Used to track the column being resized. 55 struct ColumnResizeDetails { 56 ColumnResizeDetails() = default; 57 58 // Index into table_->visible_columns() that is being resized. 59 int column_index = 0; 60 61 // X-coordinate of the mouse at the time the resize started. 62 int initial_x = 0; 63 64 // Width of the column when the drag started. 65 int initial_width = 0; 66 }; 67 68 // If not already resizing and |event| is over a resizable column starts 69 // resizing. 70 bool StartResize(const ui::LocatedEvent& event); 71 72 // Continues a resize operation. Does nothing if not in the process of 73 // resizing. 74 void ContinueResize(const ui::LocatedEvent& event); 75 76 // Toggles the sort order of the column at the location in |event|. 77 void ToggleSortOrder(const ui::LocatedEvent& event); 78 79 // Returns the column to resize given the specified x-coordinate, or -1 if |x| 80 // is not in the resize range of any columns. 81 int GetResizeColumn(int x) const; 82 is_resizing()83 bool is_resizing() const { return resize_details_.get() != nullptr; } 84 85 const gfx::FontList font_list_; 86 87 TableView* table_; 88 89 // If non-null a resize is in progress. 90 std::unique_ptr<ColumnResizeDetails> resize_details_; 91 92 DISALLOW_COPY_AND_ASSIGN(TableHeader); 93 }; 94 95 } // namespace views 96 97 #endif // UI_VIEWS_CONTROLS_TABLE_TABLE_HEADER_H_ 98