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      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_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 padding between the last decoration and the edit box.
     80   int item_edit_padding_;
     81 
     82   // The list of decorations to layout.
     83   Decorations decorations_;
     84 
     85   DISALLOW_COPY_AND_ASSIGN(LocationBarLayout);
     86 };
     87 
     88 #endif  // CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_LAYOUT_H_
     89