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// 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.
#include <memory>
#include <vector>
#include "base/macros.h"
namespace gfx {
class Rect;
namespace views {
class View;
struct DecorationInfo;
// Helper class used to layout a list of decorations inside the omnibox.
class LocationBarLayout {
enum class Position {
LocationBarLayout(Position position, int item_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;
// - 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,
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);
// 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 list of decorations to layout.
std::vector<std::unique_ptr<DecorationInfo>> decorations_;