Clean-up positioning and spacing in chrome/browser/ui/views/location_bar/location_bar_view.cc

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

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_LAYOUT_H_
+#define CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_LAYOUT_H_
+
+#include "base/memory/scoped_vector.h"
+
+namespace gfx {
+class Rect;
+}
+
+namespace views {
+class View;
+}
+
+struct LocationBarDecoration;
+
+// Helper class used to layout a list of decorations inside the omnibox.
+class LocationBarLayout {
+
+ public:
+  enum Position {
+    LEFT_EDGE = 0,
+    RIGHT_EDGE,
+  };
+
+  LocationBarLayout(Position position,
+                    int item_edit_padding,
+                    int edge_edit_padding);
+  virtual ~LocationBarLayout();
+
+  // Add a decoration, specifying:
+  // - The |y| position inside its parent;
+  // - The |height| in pixel, 0 meaning the preferred height of the |view|;
+  // - Whether the decoration should |auto_collapse| if there is no room for it;
+  // - The |max_fraction| it can use within the omnibox, or 0 for non-resizable
+  //   decorations;
+  // - |edge_item_padding|, the padding between the omnibox edge and the item,
+  //   if the item is the first one drawn;
+  // - |item_padding|, the padding between the previous item and this one;
+  // - |builtin_padding|, any padding directly built into the item;
+  // - The |view| corresponding to this decoration, a weak pointer.
+  // Note that |auto_collapse| can be true if and only if |max_fraction| is 0.
+  void AddDecoration(int y,
+                     int height,
+                     bool auto_collapse,
+                     double max_fraction,
+                     int edge_item_padding,
+                     int item_padding,
+                     int builtin_padding,
+                     views::View* view);
+
+  // Add a non-resizable decoration with standard padding.
+  void AddDecoration(int height, int builtin_padding, views::View* view);
+
+  // First pass of decoration layout process. Pass the full width of the
+  // location bar in |entry_width|. This pass will adjust it to account for
+  // non-collapsible and non-resizable decorations.
+  void LayoutPass1(int* entry_width);
+
+  // Second pass of decoration layout process. Pass the |entry_width| computed
+  // by the first pass. This pass will adjust it to account for resizable
+  // decorations.
+  void LayoutPass2(int* entry_width);
+
+  // Third and final pass of decoration layout process. Pass the |bounds|
+  // corresponding to the entire space available in the location bar. This pass
+  // will update it as decorations are laid out. |available_width| measures the
+  // empty space within the location bar, taking the decorations and text into
+  // account. |decorations| must always be ordered from the edge of the location
+  // bar towards the middle.
+  void LayoutPass3(gfx::Rect* bounds, int* available_width);
+
+ private:
+  // LEFT_EDGE means decorations are added from left to right and stacked on
+  // the left of the omnibox, RIGHT_EDGE means the opposite.
+  Position position_;
+
+  // The padding between the last decoration and the edit box.
+  int item_edit_padding_;
+
+  // The padding between the edge and the edit box, if there are no decorations.
+  int edge_edit_padding_;
+
+  // The list of decorations to layout.
+  ScopedVector<LocationBarDecoration> decorations_;
+
+  DISALLOW_COPY_AND_ASSIGN(LocationBarLayout);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_LAYOUT_H_