chrome/browser/ui/views/location_bar/location_bar_layout.h

   1 // Copyright 2013 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 CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_LAYOUT_H_
   6 #define CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_LAYOUT_H_
   7
   8 #include "base/memory/scoped_vector.h"
   9
  10 namespace gfx {
  11 class Rect;
  12 }
  13
  14 namespace views {
  15 class View;
  16 }
  17
  18 struct LocationBarDecoration;
  19
  20 // Helper class used to layout a list of decorations inside the omnibox.
  21 class LocationBarLayout {
  22
  23  public:
  24   enum Position {
  25     LEFT_EDGE = 0,
  26     RIGHT_EDGE,
  27   };
  28
  29   LocationBarLayout(Position position, int item_padding, int item_edit_padding);
  30   virtual ~LocationBarLayout();
  31
  32   // Add a decoration, specifying:
  33   // - The |y| position inside its parent;
  34   // - The |height| in pixel, 0 meaning the preferred height of the |view|;
  35   // - Whether the decoration should |auto_collapse| if there is no room for it;
  36   // - The |max_fraction| it can use within the omnibox, or 0 for non-resizable
  37   //   decorations;
  38   // - |edge_item_padding|, the padding between the omnibox edge and the item,
  39   //   if the item is the first one drawn;
  40   // - |item_padding|, the padding between the previous item and this one;
  41   // - The |view| corresponding to this decoration, a weak pointer.
  42   // Note that |auto_collapse| can be true if and only if |max_fraction| is 0.
  43   void AddDecoration(int y,
  44                      int height,
  45                      bool auto_collapse,
  46                      double max_fraction,
  47                      int edge_item_padding,
  48                      int item_padding,
  49                      views::View* view);
  50
  51   // Add a non-resizable decoration with standard padding.
  52   void AddDecoration(int y, int height, views::View* view);
  53
  54   // First pass of decoration layout process. Pass the full width of the
  55   // location bar in |entry_width|. This pass will adjust it to account for
  56   // non-collapsible and non-resizable decorations.
  57   void LayoutPass1(int* entry_width);
  58
  59   // Second pass of decoration layout process. Pass the |entry_width| computed
  60   // by the first pass. This pass will adjust it to account for resizable
  61   // decorations.
  62   void LayoutPass2(int* entry_width);
  63
  64   // Third and final pass of decoration layout process. Pass the |bounds|
  65   // corresponding to the entire space available in the location bar. This pass
  66   // will update it as decorations are laid out. |available_width| measures the
  67   // empty space within the location bar, taking the decorations and text into
  68   // account. |decorations| must always be ordered from the edge of the location
  69   // bar towards the middle.
  70   void LayoutPass3(gfx::Rect* bounds, int* available_width);
  71
  72  private:
  73   typedef ScopedVector<LocationBarDecoration> Decorations;
  74
  75   // LEFT_EDGE means decorations are added from left to right and stacked on
  76   // the left of the omnibox, RIGHT_EDGE means the opposite.
  77   Position position_;
  78
  79   // The default padding between items.
  80   int item_padding_;
  81
  82   // The padding between the last decoration and the edit box.
  83   int item_edit_padding_;
  84
  85   // The list of decorations to layout.
  86   Decorations decorations_;
  87
  88   DISALLOW_COPY_AND_ASSIGN(LocationBarLayout);
  89 };
  90
  91 #endif  // CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_LAYOUT_H_