Broke out layout metric information from ViewsDelegate to LayoutProvider

chrome/browser/ui/views/harmony/layout_delegate.h

-// Copyright 2016 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_HARMONY_LAYOUT_DELEGATE_H_
-#define CHROME_BROWSER_UI_VIEWS_HARMONY_LAYOUT_DELEGATE_H_
-
-#include "ui/views/layout/grid_layout.h"
-
-namespace views {
-class TypographyProvider;
-}
-
-class LayoutDelegate {
- public:
-  enum class Metric {
-    // Padding on the left and right side of a button's label.
-    BUTTON_HORIZONTAL_PADDING,
-    // The maximum width a button can have and still influence the sizes of
-    // other linked buttons.  This allows short buttons to have linked widths
-    // without long buttons making things overly wide.
-    BUTTON_MAX_LINKABLE_WIDTH,
-    // Default minimum width of a button.
-    BUTTON_MINIMUM_WIDTH,
-    // Margin between the edge of a dialog and the left, right, or bottom of a
-    // contained button.
-    DIALOG_BUTTON_MARGIN,
-    // Minimum width of a dialog button.
-    DIALOG_BUTTON_MINIMUM_WIDTH,
-    // Spacing between a dialog button and the content above it.
-    DIALOG_BUTTON_TOP_SPACING,
-    // Horizontal or vertical margin between the edge of a dialog and the close
-    // button in the upper trailing corner.
-    DIALOG_CLOSE_BUTTON_MARGIN,
-    // Horizontal or vertical margin between the edge of a panel and the
-    // contained content.
-    PANEL_CONTENT_MARGIN,
-    // Horizontal spacing between buttons that are logically related, e.g.
-    // for a button set.
-    RELATED_BUTTON_HORIZONTAL_SPACING,
-    // Horizontal spacing between other controls that are logically related.
-    RELATED_CONTROL_HORIZONTAL_SPACING,
-    // Smaller horizontal spacing between other controls that are logically
-    // related.
-    RELATED_CONTROL_HORIZONTAL_SPACING_SMALL,
-    // Vertical spacing between controls that are logically related.
-    RELATED_CONTROL_VERTICAL_SPACING,
-    // Smaller vertical spacing between controls that are logically related.
-    RELATED_CONTROL_VERTICAL_SPACING_SMALL,
-    // Horizontal spacing between an item such as an icon or checkbox and a
-    // label related to it.
-    RELATED_LABEL_HORIZONTAL_SPACING,
-    // Horizontal indent of a subsection relative to related items above, e.g.
-    // checkboxes below explanatory text/headings.
-    SUBSECTION_HORIZONTAL_INDENT,
-    // Horizontal spacing between controls that are logically unrelated.
-    UNRELATED_CONTROL_HORIZONTAL_SPACING,
-    // Larger horizontal spacing between unrelated controls.
-    UNRELATED_CONTROL_HORIZONTAL_SPACING_LARGE,
-    // Vertical spacing between controls that are logically unrelated.
-    UNRELATED_CONTROL_VERTICAL_SPACING,
-    // Larger vertical spacing between unrelated controls.
-    UNRELATED_CONTROL_VERTICAL_SPACING_LARGE,
-    // Padding to add to vector image buttons to increase their click and touch
-    // target size.
-    VECTOR_IMAGE_BUTTON_PADDING,
-  };
-
-  enum class DialogWidth {
-    SMALL,
-    MEDIUM,
-    LARGE,
-  };
-
-  LayoutDelegate() {}
-  virtual ~LayoutDelegate() {}
-
-  // Returns the active LayoutDelegate singleton, depending on UI configuration.
-  // This may be an instance of this class or a subclass, e.g. a
-  // HarmonyLayoutDelegate.
-  static LayoutDelegate* Get();
-
-  // Returns the requested metric in DIPs.
-  virtual int GetMetric(Metric metric) const;
-
-  // Returns the alignment used for control labels in a GridLayout; for example,
-  // in this GridLayout:
-  //   ---------------------------
-  //   | Label 1      Checkbox 1 |
-  //   | Label 2      Checkbox 2 |
-  //   ---------------------------
-  // This value controls the alignment used for "Label 1" and "Label 2".
-  virtual views::GridLayout::Alignment GetControlLabelGridAlignment() const;
-
-  // Returns whether to use extra padding on dialogs. If this is false, content
-  // Views for dialogs should not insert extra padding at their own edges.
-  virtual bool UseExtraDialogPadding() const;
-
-  // Returns whether to show the icon next to the title text on a dialog.
-  virtual bool ShouldShowWindowIcon() const;
-
-  // DEPRECATED.  Returns whether Harmony mode is enabled.
-  //
-  // Instead of using this, create a generic solution that works for all UI
-  // types, e.g. by adding a new LayoutDistance value that means what you need.
-  //
-  // TODO(pkasting): Fix callers and remove this.
-  virtual bool IsHarmonyMode() const;
-
-  // Returns the preferred width in DIPs for a dialog of the specified |width|.
-  // May return 0 if the dialog has no preferred width.
-  virtual int GetDialogPreferredWidth(DialogWidth width) const;
-
-  // Returns the class that maps views::style values (TextContext and TextStyle)
-  // to specific font properties (e.g. typeface, size, color, line spacing).
-  virtual const views::TypographyProvider& GetTypographyProvider() const;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(LayoutDelegate);
-};
-
-#endif  // CHROME_BROWSER_UI_VIEWS_HARMONY_LAYOUT_DELEGATE_H_