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// Copyright 2017 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_TRY_CHROME_DIALOG_WIN_BUTTON_LAYOUT_H_
#define CHROME_BROWSER_UI_VIEWS_TRY_CHROME_DIALOG_WIN_BUTTON_LAYOUT_H_
#include "base/macros.h"
#include "ui/gfx/geometry/size.h"
#include "ui/views/layout/layout_manager.h"
namespace views {
class View;
}
// A LayoutManager that positions the TryChromeDialog's action button(s) based
// on the number and their width requirements. The possible layouts are:
//
// One narrow button: | [button 1]|
//
// Two narrow buttons: |[button 1] [button 2]|
//
// One wide button: |[ button 1 ]|
//
// Two wide buttons: |[ button 1 ]|
// |[ button 2 ]|
//
// An instance of this layout manager is expected to be installed on a View to
// which only the one or two action buttons are added.
class ButtonLayout : public views::LayoutManager {
public:
// The dialog's one or two action button(s) must be the only children of
// |view|. |view_width| is the desired width of the view, which controls the
// width of the individual buttons as above. The layout manager of |view|'s
// parent must respect this width (by, for example, using SizeType::USE_PREF
// for the hosting column's size_type if it uses GridLayout).
explicit ButtonLayout(int view_width);
~ButtonLayout() override;
protected:
// views::LayoutManager:
void Layout(views::View* host) override;
gfx::Size GetPreferredSize(const views::View* host) const override;
private:
friend class ButtonLayoutTest;
// The horizontal or vertical space between two buttons.
enum { kPaddingBetweenButtons = 4 };
// Returns the preferred size of the largest child of |host|.
static gfx::Size GetMaxChildPreferredSize(const views::View* host);
// Returns true if wide buttons must be used based on the given widths.
static bool UseWideButtons(int host_width, int max_child_width);
// The desired width of the view.
const int view_width_;
DISALLOW_COPY_AND_ASSIGN(ButtonLayout);
};
#endif // CHROME_BROWSER_UI_VIEWS_TRY_CHROME_DIALOG_WIN_BUTTON_LAYOUT_H_