BoxLayout now suports per-view margins.

ui/views/examples/box_layout_example.h

+// 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 UI_VIEWS_EXAMPLES_BOX_LAYOUT_EXAMPLE_H_
+#define UI_VIEWS_EXAMPLES_BOX_LAYOUT_EXAMPLE_H_
+
+#include "base/macros.h"
+#include "ui/views/controls/button/button.h"
+#include "ui/views/controls/button/label_button.h"
+#include "ui/views/controls/combobox/combobox_listener.h"
+#include "ui/views/controls/textfield/textfield_controller.h"
+#include "ui/views/examples/example_base.h"
+#include "ui/views/layout/box_layout.h"
+
+namespace views {
+
+class Checkbox;
+class Combobox;
+class Textfield;
+
+namespace examples {
+
+namespace {
+
+class ChildPanel;
+}
+
+class VIEWS_EXAMPLES_EXPORT BoxLayoutExample : public ExampleBase,
+                                               public ButtonListener,
+                                               public ComboboxListener,
+                                               public TextfieldController {
+ public:
+  BoxLayoutExample();
+  ~BoxLayoutExample() override;
+
+  // ExampleBase
+  void CreateExampleView(View* container) override;
+
+ private:
+  friend class ChildPanel;
+  // ButtonListener
+  void ButtonPressed(Button* sender, const ui::Event& event) override;
+
+  // ComboboxListener
+  void OnPerformAction(Combobox* combobox) override;
+
+  // TextfieldController
+  void ContentsChanged(Textfield* sender,
+                       const base::string16& new_contents) override;
+
+  // Force the box_layout_panel_ to layout and repaint.
+  void RefreshLayoutPanel();
+
+  // Set the border insets on the current BoxLayout instance.
+  void UpdateBorderInsets();
+
+  // Create a new BoxLayout and ensure all settings match the current state of
+  // the various control_panel_ controls.
+  void UpdateLayoutManager();
+
+  // Create a Combobox with a label with |label_text| to the left. Adjust
+  // |vertical_pos| to |vertical_pos| + combo_box->height() + kSpacing.
+  Combobox* CreateCombobox(const base::string16& label_text,
+                           const char** items,
+                           int count,
+                           int& vertical_pos);
+
+  // Create just a Textfield at the current position of |horizontal_pos| and
+  // |vertical_pos|. Update |horizontal_pos| to |horizontal_pos| +
+  // text_field->width() + kSpacing.
+  Textfield* CreateRawTextfield(int& horizontal_pos,
+                                int vertical_pos,
+                                bool add);
+
+  // Create a Textfield with a label with |label_text| to the left. Adjust
+  // |vertical_pos| to |vertical_pos| + combo_box->height() + kSpacing.
+  Textfield* CreateTextfield(const base::string16& label_text,
+                             int& vertical_pos);
+
+  // Returns the current values contained in the child_panel_size_[] Textfields
+  // as a gfx::Size. If either value is negative or not a valid integer,
+  // default values are returned, 180 x 90 for width and height, respectively.
+  gfx::Size GetChildPanelSize() const;
+
+  BoxLayout* layout_ = nullptr;
+  View* full_panel_ = nullptr;
+  View* box_layout_panel_ = nullptr;
+  View* control_panel_ = nullptr;
+  LabelButton* add_button_ = nullptr;
+  Combobox* orientation_ = nullptr;
+  Combobox* main_axis_alignment_ = nullptr;
+  Combobox* cross_axis_alignment_ = nullptr;
+  Textfield* between_child_spacing_ = nullptr;
+  Textfield* default_flex_ = nullptr;
+  Textfield* min_cross_axis_size_ = nullptr;
+  Textfield* border_insets_[4] = {nullptr, nullptr, nullptr, nullptr};
+  Textfield* child_panel_size_[2] = {nullptr, nullptr};
+  Checkbox* collapse_margins_ = nullptr;
+  int panel_count_ = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(BoxLayoutExample);
+};
+
+}  // namespace examples
+}  // namespace views
+#endif  // UI_VIEWS_EXAMPLES_BOX_LAYOUT_EXAMPLE_H_