Algorithm for deciding if a frame's selection should be hidden

third_party/WebKit/Source/core/editing/FrameSelectionTest.cpp

 // Copyright 2014 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 "core/editing/FrameSelection.h"
 
 #include <memory>
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
@@ skipping 310 matching lines @@
 
   Selection().SetSelectedRange(
       EphemeralRange(Position(text, 0), Position(text, 12)),
       VP_DEFAULT_AFFINITY, SelectionDirectionalMode::kNonDirectional, 0);
 
   EXPECT_TRUE(Selection().IsHandleVisible())
       << "If handles were present before"
          "selectSetSelectedRange they should be present after it.";
 }
 
+TEST_F(FrameSelectionTest, CaretInFocusedShadowTree) {
+  SetBodyContent("<input id='field'>");  // <input> hosts a shadow tree.
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsNone());
+  EXPECT_TRUE(Selection().IsHidden());
+
+  Element* const field = GetDocument().GetElementById("field");
+  field->focus();
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsCaret());
+  EXPECT_FALSE(Selection().IsHidden());
+
+  field->blur();  // Move focus to document body.
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsCaret());
+  EXPECT_TRUE(Selection().IsHidden());  // Caret is now hidden.
+}
+
+TEST_F(FrameSelectionTest, CaretInFocusedEditableDiv) {
+  SetBodyContent("<div contenteditable id='ce'>blabla</div>");
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsNone());
+  EXPECT_TRUE(Selection().IsHidden());
+
+  Element* const ce = GetDocument().GetElementById("ce");
+  ce->focus();
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsCaret());
+  EXPECT_FALSE(Selection().IsHidden());
+
+  ce->blur();  // Move focus to document body.
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsCaret());
+  EXPECT_TRUE(Selection().IsHidden());  // Caret is now hidden.
+}
+
+TEST_F(FrameSelectionTest, SelectionInFocusedEditableDiv) {
+  SetBodyContent("<div contenteditable id='ce'>blabla</div>");
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsNone());
+  EXPECT_TRUE(Selection().IsHidden());
+
+  Element* const ce = GetDocument().GetElementById("ce");
+  ce->focus();
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsCaret());
+  EXPECT_FALSE(Selection().IsHidden());
+
+  Selection().SelectAll();
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsRange());
+  EXPECT_FALSE(Selection().IsHidden());
+
+  ce->blur();  // Move focus to document body.
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsRange());
+  EXPECT_FALSE(Selection().IsHidden());  // Range is still visible.
+}
+
+// crbug.com/692898
+TEST_F(FrameSelectionTest, FocusingLinkHidesCaretInTextControl) {
+  SetBodyContent("<input id='field'><a href='www' id='alink'>link</a>");
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsNone());
+  EXPECT_TRUE(Selection().IsHidden());
+
+  Element* const field = GetDocument().GetElementById("field");
+  field->focus();
+  EXPECT_FALSE(Selection().IsHidden());
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsCaret());
+
+  Element* const alink = GetDocument().GetElementById("alink");
+  alink->focus();
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsCaret());
+  EXPECT_TRUE(Selection().IsHidden());
+}
+
+// crbug.com/692898
+TEST_F(FrameSelectionTest, FocusingLinkHidesSelectionInTextControl) {
+  SetBodyContent("<input id='field'><a href='www' id='alink'>link</a>");
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsNone());
+  EXPECT_TRUE(Selection().IsHidden());
+
+  Element* const field = GetDocument().GetElementById("field");
+  field->focus();
+  EXPECT_FALSE(Selection().IsHidden());
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsCaret());
+
+  Selection().SelectAll();
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsRange());
+  EXPECT_FALSE(Selection().IsHidden());
+
+  Element* const alink = GetDocument().GetElementById("alink");
+  alink->focus();
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsRange());
+  EXPECT_TRUE(Selection().IsHidden());
+}
+
+// crbug.com/713051
+TEST_F(FrameSelectionTest, FocusedNonEditableParent) {
+  SetBodyContent("<div tabindex='-1' id='parent'><input id='field'></div>");
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsNone());
+  EXPECT_TRUE(Selection().IsHidden());
+
+  Element* const field = GetDocument().GetElementById("field");
+  field->focus();
+  EXPECT_FALSE(Selection().IsHidden());
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsCaret());
+
+  // Here the selection belongs to <input>'s shadow tree and that tree has a
+  // non-editable parent that is is focused.
+  Element* const parent = GetDocument().GetElementById("parent");
+  parent->focus();
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsCaret());
+  EXPECT_TRUE(Selection().IsHidden());  // Focus is outside editing boundary.
+}
+
+// crbug.com/707143
+TEST_F(FrameSelectionTest, RangeContainsFocus) {
+  SetBodyContent(
+      "<div id='outer'>"
+      "  <div>"
+      "    <span id='start'>start</span>"
+      "  </div>"
+      "  <a href='www' id='alink'>link</a>"
+      "  <div>line 1</div>"
+      "  <div id='middle'>line 2</div>"
+      "  <div>line 3</div>"
+      "  <div>line 4</div>"
+      "  <span id='end'>end</span>"
+      "  <div></div>"
+      "</div>");
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsNone());
+  EXPECT_TRUE(Selection().IsHidden());
+
+  Element* const start = GetDocument().GetElementById("start");
+  Element* const end = GetDocument().GetElementById("end");
+  Selection().SetSelection(
+      SelectionInDOMTree::Builder()
+          .SetBaseAndExtent(Position(start, 0), Position(end, 0))
+          .Build());
+  EXPECT_FALSE(Selection().IsHidden());
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsRange());
+
+  Element* const alink = GetDocument().GetElementById("alink");
+  alink->focus();
+  EXPECT_FALSE(Selection().IsHidden());  // Range still visible.
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsRange());
+}
+
+// crbug.com/707143
+TEST_F(FrameSelectionTest, RangeOutsideFocus) {
+  SetBodyContent(
+      "<a href='www' id='alink'>link</a>"
+      "<div id='outer'>"
+      "  <div>"
+      "    <span id='start'>start</span>"
+      "  </div>"
+      "  <div>line 1</div>"
+      "  <div id='middle'>line 2</div>"
+      "  <div>line 3</div>"
+      "  <div>line 4</div>"
+      "  <span id='end'>end</span>"
+      "  <div></div>"
+      "</div>");
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsNone());
+  EXPECT_TRUE(Selection().IsHidden());
+
+  Element* const start = GetDocument().GetElementById("start");
+  Element* const end = GetDocument().GetElementById("end");
+  Selection().SetSelection(
+      SelectionInDOMTree::Builder()
+          .SetBaseAndExtent(Position(start, 0), Position(end, 0))
+          .Build());
+  EXPECT_FALSE(Selection().IsHidden());
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsRange());
+
+  Element* const alink = GetDocument().GetElementById("alink");
+  alink->focus();
+  EXPECT_FALSE(Selection().IsHidden());  // Range still visible.
+  EXPECT_TRUE(Selection().GetSelectionInDOMTree().IsRange());
+}
+
 }  // namespace blink