views: add layout delegates

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

+// 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.
+
+#include "chrome/browser/ui/views/harmony/layout_delegate.h"
+#include "base/lazy_instance.h"
+#include "chrome/browser/ui/views/harmony/harmony_layout_delegate.h"
+#include "ui/base/material_design/material_design_controller.h"
+#include "ui/views/layout/layout_constants.h"
+
+static base::LazyInstance<LayoutDelegate> layout_delegate_ =
+    LAZY_INSTANCE_INITIALIZER;
+
+// static
+LayoutDelegate* LayoutDelegate::Get() {
+  return layout_delegate_.Pointer();
+}
+
+// static
+LayoutDelegate* LayoutDelegate::GetActiveInstance() {
+  return ui::MaterialDesignController::IsSecondaryUiMaterial()
+             ? HarmonyLayoutDelegate::Get()
+             : LayoutDelegate::Get();
+}
+
+int LayoutDelegate::GetLayoutDistance(LayoutDistanceType type) const {
+  switch (type) {
+    case LayoutDistanceType::PANEL_VERT_MARGIN:
+      return views::kPanelVertMargin;
+    case LayoutDistanceType::RELATED_BUTTON_HORIZONTAL_SPACING:
+      return views::kRelatedButtonHSpacing;
+    case LayoutDistanceType::RELATED_CONTROL_HORIZONTAL_SPACING:
+      return views::kRelatedControlHorizontalSpacing;
+    case LayoutDistanceType::RELATED_CONTROL_VERTICAL_SPACING:
+      return views::kRelatedControlVerticalSpacing;
+    case LayoutDistanceType::UNRELATED_CONTROL_VERTICAL_SPACING:
+      return views::kUnrelatedControlVerticalSpacing;
+    case LayoutDistanceType::UNRELATED_CONTROL_LARGE_VERTICAL_SPACING:
+      return views::kUnrelatedControlLargeVerticalSpacing;
+    case LayoutDistanceType::BUTTON_VEDGE_MARGIN_NEW:
+      return views::kButtonVEdgeMarginNew;
+    case LayoutDistanceType::BUTTON_HEDGE_MARGIN_NEW:
+      return views::kButtonHEdgeMarginNew;
+  }
+  return 0;
+}
+
+views::GridLayout::Alignment LayoutDelegate::GetControlLabelGridAlignment()
+    const {
+  return views::kControlLabelGridAlignment;
+}
+
+bool LayoutDelegate::UseExtraDialogPadding() const {
+  return true;
+}