Experimental alignment layout manager using a property on the views

ui/views/examples/anchor_example.cc

+// Copyright (c) 2012 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 "ui/views/examples/anchor_example.h"
+
+#include "base/macros.h"
+#include "base/strings/utf_string_conversions.h"
+#include "build/build_config.h"
+#include "ui/views/background.h"
+#include "ui/views/border.h"
+#include "ui/views/controls/button/checkbox.h"
+#include "ui/views/controls/button/md_text_button.h"
+#include "ui/views/controls/button/radio_button.h"
+#include "ui/views/layout/align_layout.h"
+#include "ui/views/view.h"
+#include "ui/views/widget/widget.h"
+
+using base::ASCIIToUTF16;
+
+namespace views {
+namespace examples {
+
+static constexpr Fill Fill_None =
+    static_cast<Fill>(static_cast<int>(Fill::Content) + 1);
+
+AnchorExample::AnchorExample() : ExampleBase("Anchor") {}
+
+AnchorExample::~AnchorExample() {}
+
+void AnchorExample::CreateExampleView(View* container) {
+  container->SetLayoutManager(new AlignLayout());
+  work_panel_ = new View();
+  work_panel_->SetLayoutManager(new AlignLayout());
+  work_panel_->SetBounds(
+      0, 0, container->parent()->GetContentsBounds().width() > 0
+                ? container->parent()->GetContentsBounds().width() - 175
+                : 600,
+      10);
+  work_panel_->attributes().Add(
+      base::WrapUnique(new FillAttribute(Fill::Right)));
+  work_panel_->attributes().Add(base::WrapUnique(new AnchorAttribute(
+      {Anchor::Left, Anchor::Top, Anchor::Right, Anchor::Bottom})));
+  work_panel_->SetBorder(Border::CreateSolidBorder(1, SK_ColorGRAY));
+  container->AddChildView(work_panel_);
+  for (int i = 0; i < 4; i++) {
+    Anchor anchor = static_cast<Anchor>(i);
+    Checkbox* checkbox = new Checkbox(AnchorText(anchor));
+    checkbox->set_listener(this);
+    checkbox->SetFocusForPlatform();
+    checkbox->SetGroup(10);
+    checkbox->set_id(i);
+    checkbox->SetBounds(10, 20 * i, 150, 20);
+    checkbox->SetChecked(current_anchors_.Contains(anchor));
+    container->AddChildView(checkbox);
+  }
+  for (int i = 0; i < 6; i++) {
+    Fill fill = static_cast<Fill>(i);
+    RadioButton* radiobutton = new RadioButton(FillText(fill), 5);
+    radiobutton->set_listener(this);
+    radiobutton->SetFocusForPlatform();
+    radiobutton->set_id(i);
+    radiobutton->SetBounds(10, 20 * i + 100, 150, 20);
+    container->AddChildView(radiobutton);
+  }
+  LabelButton* reset_button = MdTextButton::Create(this, ASCIIToUTF16("Reset"));
+  reset_button->SetFocusForPlatform();
+  reset_button->SetBounds(20, 240, 80, 25);
+  container->AddChildView(reset_button);
+  anchored_view_label_ = new Label(AnchorsText(current_anchors_));
+  anchored_view_label_->SetBounds(125, 150, 150, 30);
+  anchored_view_label_->SetBorder(Border::CreateSolidBorder(1, SK_ColorGRAY));
+  anchored_view_label_->attributes().Add(
+      base::WrapUnique(new AnchorAttribute(current_anchors_)));
+  work_panel_->AddChildView(anchored_view_label_);
+}
+
+void AnchorExample::ButtonPressed(Button* sender, const ui::Event& event) {
+  base::string16 class_name = ASCIIToUTF16(sender->GetClassName());
+  if (class_name == ASCIIToUTF16("Checkbox")) {
+    AnchorAttribute* attribute = nullptr;
+    Checkbox* checkbox = static_cast<Checkbox*>(sender);
+    Anchor anchor = static_cast<Anchor>(checkbox->id());
+    if (checkbox->checked())
+      current_anchors_.Include(anchor);
+    else
+      current_anchors_.Exclude(anchor);
+    if (anchored_view_label_->attributes().Find(attribute)) {
+      anchored_view_label_->SetText(AnchorsText(current_anchors_));
+      attribute->GetContent().SetAnchors(current_anchors_);
+      work_panel_->Layout();
+    }
+  } else if (class_name == ASCIIToUTF16("RadioButton")) {
+    FillAttribute* attribute = nullptr;
+    AnchorAttribute* anchors = nullptr;
+    RadioButton* radiobutton = static_cast<RadioButton*>(sender);
+    Fill fill = static_cast<Fill>(radiobutton->id());
+    if (fill == Fill_None) {
+      anchored_view_label_->attributes().Remove(
+          GetAttributeId<FillAttribute>());
+    } else {
+      if (!anchored_view_label_->attributes().Find(attribute))
+        anchored_view_label_->attributes().Add(
+            base::WrapUnique(new FillAttribute(fill)));
+      else
+        attribute->SetFill(fill);
+    }
+    if (anchored_view_label_->attributes().Find(anchors))
+      ReflectAnchors(sender->parent(), anchors);
+    work_panel_->Layout();
+  } else if (class_name == ASCIIToUTF16("LabelButton")) {
+    AnchorAttribute* anchors = nullptr;
+    anchored_view_label_->attributes().Remove(GetAttributeId<FillAttribute>());
+    anchored_view_label_->SetBounds(125, 150, 150, 30);
+    if (anchored_view_label_->attributes().Find(anchors))
+      ReflectAnchors(sender->parent(), anchors);
+    ClearAlignButtons(sender->parent());
+  }
+}
+
+base::string16 AnchorExample::FillText(Fill fill) {
+  switch (fill) {
+    case Fill::Left:
+      return ASCIIToUTF16("Fill::Left");
+    case Fill::Top:
+      return ASCIIToUTF16("Fill::Top");
+    case Fill::Right:
+      return ASCIIToUTF16("Fill::Right");
+    case Fill::Bottom:
+      return ASCIIToUTF16("Fill::Bottom");
+    case Fill::Content:
+      return ASCIIToUTF16("Fill::Content");
+  }
+  return ASCIIToUTF16("Fill_None");
+}
+
+base::string16 AnchorExample::AnchorText(Anchor anchor) {
+  switch (anchor) {
+    case Anchor::Left:
+      return ASCIIToUTF16("Anchor::Left");
+    case Anchor::Top:
+      return ASCIIToUTF16("Anchor::Top");
+    case Anchor::Right:
+      return ASCIIToUTF16("Anchor::Right");
+    case Anchor::Bottom:
+      return ASCIIToUTF16("Anchor::Bottom");
+  }
+  return ASCIIToUTF16("Invalid");
+}
+
+base::string16 AnchorExample::AnchorsText(Anchors anchors) {
+  base::string16 result;
+  for (int i = 0; i < 4; i++) {
+    Anchor anchor = static_cast<Anchor>(i);
+    if (anchors.Contains(anchor)) {
+      if (!result.empty())
+        result.append(ASCIIToUTF16(", "));
+      result.append(AnchorText(anchor));
+    }
+  }
+  return result;
+}
+
+void AnchorExample::ClearAlignButtons(View* view) {
+  for (int i = 0; i < view->child_count(); i++) {
+    View* child = view->child_at(i);
+    base::string16 classname = ASCIIToUTF16(child->GetClassName());
+    if (classname == ASCIIToUTF16("RadioButton")) {
+      RadioButton* radiobutton = static_cast<RadioButton*>(child);
+      radiobutton->SetChecked(false);
+    }
+  }
+}
+
+void AnchorExample::ReflectAnchors(View* view, AnchorAttribute* attribute) {
+  for (int i = 0; i < view->child_count(); i++) {
+    View* child = view->child_at(i);
+    base::string16 classname = ASCIIToUTF16(child->GetClassName());
+    if (classname == ASCIIToUTF16("Checkbox")) {
+      Checkbox* checkbox = static_cast<Checkbox*>(child);
+      Anchor anchor = static_cast<Anchor>(checkbox->id());
+      checkbox->SetChecked(attribute->GetContent().anchors().Contains(anchor));
+    }
+  }
+}
+
+}  // namespace examples
+}  // namespace views