2016-03-02T18:53:01 LayoutPosition

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

+// 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 "core/editing/LayoutPosition.h"
+
+#include "core/dom/Element.h"
+#include "core/dom/NodeTraversal.h"
+#include "core/dom/Text.h"
+#include "core/editing/EditingTestBase.h"
+#include "core/editing/VisibleUnits.h"
+#include "core/layout/LayoutView.h"
+#include "core/layout/line/InlineTextBox.h"
+#include "wtf/Noncopyable.h"
+
+namespace blink {
+
+class LayoutPositionTest : public EditingTestBase {
+    WTF_MAKE_NONCOPYABLE(LayoutPositionTest);
+
+public:
+    // |LayoutPosition| constructors
+    LayoutPosition afterAnchorOf(LayoutObject*);
+    LayoutPosition beforeAnchorOf(LayoutObject*);
+    LayoutPosition beforeChildrenOf(LayoutObject*);
+    LayoutPosition textPositionOf(InlineBox*, int offsetInBox);
+
+    // |LayoutPosition| member variable getters
+    static PositionAnchorType anchorTypeOf(const LayoutPosition&);
+    static InlineBox* inlineBoxOf(const LayoutPosition&);
+    static LayoutObject* layoutObjectOf(const LayoutPosition&);
+    static int textOffsetOf(const LayoutPosition&);
+
+protected:
+    LayoutPositionTest() = default;
+
+    FloatQuad caretQuadOf(const LayoutPosition& position)
+    {
+        return position.computeCaretQuad();
+    }
+
+    // Shortcuts
+    LayoutPosition layoutPositionAfter(Node* node)
+    {
+        return LayoutPosition::create(Position::afterNode(node));
+    }
+
+    LayoutPosition layoutPositionBefore(Node* node)
+    {
+        return LayoutPosition::create(Position::beforeNode(node));
+    }
+
+    LayoutPosition layoutPositionOf(Node* node, int offset)
+    {
+        return LayoutPosition::create(Position(node, offset));
+    }
+};
+
+// static
+LayoutPosition LayoutPositionTest::afterAnchorOf(LayoutObject* layoutObject)
+{
+    return LayoutPosition::afterAnchorOf(layoutObject);
+}
+
+// static
+LayoutPosition LayoutPositionTest::beforeAnchorOf(LayoutObject* layoutObject)
+{
+    return LayoutPosition::beforeAnchorOf(layoutObject);
+}
+
+// static
+LayoutPosition LayoutPositionTest::beforeChildrenOf(LayoutObject* layoutObject)
+{
+    return LayoutPosition::beforeChildrenOf(layoutObject);
+}
+
+LayoutPosition LayoutPositionTest::textPositionOf(InlineBox* box, int offsetInBox)
+{
+    return LayoutPosition(InlineBoxPosition(box, offsetInBox));
+}
+
+// static
+PositionAnchorType LayoutPositionTest::anchorTypeOf(const LayoutPosition& position)
+{
+    return position.m_anchorType;
+}
+
+// static
+InlineBox* LayoutPositionTest::inlineBoxOf(const LayoutPosition& position)
+{
+    return position.m_inlineBox;
+}
+
+// static
+LayoutObject* LayoutPositionTest::layoutObjectOf(const LayoutPosition& position)
+{
+    return position.m_layoutObject;
+}
+
+// static
+int LayoutPositionTest::textOffsetOf(const LayoutPosition& position)
+{
+    ASSERT(position.isOffsetInAnchor());
+    return position.m_offsetInBox;
+}
+
+TEST_F(LayoutPositionTest, canPlaceCaret)
+{
+    setBodyContent("<div>  234  <br> </div>");
+    updateAllLifecyclePhases();
+
+    // Layout Tree of this test:
+    // +LayoutView {#document} (0,0)+800x600
+    // |  +LayoutBlockFlow {HTML} (0,0)+800x600
+    // |  |  +LayoutBlockFlow {BODY} (8,8)+784x584
+    // |  |  |  +LayoutBlockFlow {DIV} (0,0)+784x2
+    // |  |  |  |  |  |  +-RootInlineBox DIV frameRect=(0,0)+4x2 bidiLevel=0
+    // |  |  |  |  |  |  |  +InlineTextBox "234 " start=2 end=5 bidiLevel=0
+    // |  |  |  |  +LayoutText {"  234  "}
+    // ------------>LayoutBR {BR}
+    Element* const body = document().body();
+    Node* const div = body->firstChild();
+    Node* const text = div->firstChild();
+    Node* const br = text->nextSibling();
+    Node* const lastText = div->lastChild();
+
+    EXPECT_TRUE(layoutPositionOf(body, 0).canPlaceCaret());
+    EXPECT_TRUE(layoutPositionBefore(div).canPlaceCaret());
+
+    EXPECT_TRUE(layoutPositionOf(div, 0).canPlaceCaret());
+    EXPECT_TRUE(layoutPositionBefore(text).canPlaceCaret());
+    EXPECT_TRUE(layoutPositionAfter(text).canPlaceCaret());
+    EXPECT_TRUE(layoutPositionOf(text, 0).canPlaceCaret());
+    EXPECT_TRUE(layoutPositionOf(text, 1).canPlaceCaret());
+    EXPECT_TRUE(layoutPositionOf(text, 2).canPlaceCaret());
+    EXPECT_TRUE(layoutPositionOf(text, 3).canPlaceCaret());
+    EXPECT_TRUE(layoutPositionOf(text, 4).canPlaceCaret());
+    EXPECT_TRUE(layoutPositionOf(text, 5).canPlaceCaret());
+    EXPECT_TRUE(layoutPositionOf(text, 6).canPlaceCaret());
+    EXPECT_TRUE(layoutPositionOf(text, 6).canPlaceCaret());
+
+    EXPECT_FALSE(layoutPositionBefore(br).canPlaceCaret());
+    EXPECT_FALSE(layoutPositionOf(div, 1).canPlaceCaret());
+    EXPECT_FALSE(layoutPositionAfter(br).canPlaceCaret())
+        << "Since it is hard to compute caret quad for after BR, we don't allow to place caret after BR.";
+
+    EXPECT_FALSE(layoutPositionBefore(lastText).canPlaceCaret())
+        << "We can't place caret before collapsed whitespace.";
+    EXPECT_FALSE(layoutPositionOf(div, 2).canPlaceCaret())
+        << "We can't place caret before collapsed whitespace.";
+    EXPECT_FALSE(layoutPositionAfter(lastText).canPlaceCaret())
+        << "We can't place caret before collapsed whitespace.";
+    EXPECT_FALSE(layoutPositionOf(div, 3).canPlaceCaret())
+        << "We can't place caret before collapsed whitespace.";
+
+    EXPECT_TRUE(layoutPositionAfter(div).canPlaceCaret());
+    EXPECT_TRUE(layoutPositionOf(body, 1).canPlaceCaret());
+}
+
+TEST_F(LayoutPositionTest, ctorLeftToRightSimple)
+{
+    setBodyContent("<div id=one>222</div>");
+    updateAllLifecyclePhases();
+
+    Element* const body = document().body();
+    Element* const one = body->querySelector("#one", ASSERT_NO_EXCEPTION);
+    InlineTextBox* const textBox = toLayoutText(one->firstChild()->layoutObject())->firstTextBox();
+
+    EXPECT_EQ(beforeAnchorOf(one->layoutObject()), layoutPositionOf(body, 0));
+    EXPECT_EQ(afterAnchorOf(one->layoutObject()), layoutPositionOf(body, 1));
+
+    EXPECT_EQ(beforeAnchorOf(one->layoutObject()), layoutPositionBefore(one))
+        << "beforeAnchor(one) is a valid position";
+    EXPECT_EQ(textPositionOf(textBox, 0), LayoutPosition::create(Position::firstPositionInNode(one)))
+        << "beforeChildren(one) should be text box position";
+    EXPECT_EQ(textPositionOf(textBox, 1), layoutPositionOf(one->firstChild(), 1))
+        << "offsetInAnchor('222') should be text box position";
+    EXPECT_EQ(textPositionOf(textBox, 3), LayoutPosition::create(Position::lastPositionInNode(one)))
+        << "afterChildren(one) should be end of text box";
+    EXPECT_EQ(afterAnchorOf(one->layoutObject()), layoutPositionAfter(one))
+        << "afterAnchor(one) is a valid position";
+
+    EXPECT_EQ(layoutPositionOf(body, 0), layoutPositionBefore(one))
+        << "(body, 0) and before(one) should be same.";
+    EXPECT_EQ(layoutPositionOf(body, 1), layoutPositionAfter(one))
+        << "(body, 0) and after(one) should be same.";
+
+    EXPECT_EQ(layoutPositionOf(one, 0), layoutPositionOf(one->firstChild(), 0))
+        << "(one, 0) and (text, 0) should be same.";
+    EXPECT_EQ(layoutPositionOf(one, 1), layoutPositionOf(one->firstChild(), 3))
+        << "(one, 1) and (text, 3) should be same.";
+}
+
+// See http://unicode.org/cldr/utility/bidi.jsp for BiDi level and ordering.
+TEST_F(LayoutPositionTest, ctorRightToLeftMixed)
+{
+    setBodyContent("<div id=one>mark 3.1% &#x0645;&#x0627;&#x0631;&#x0652;&#x0643 2.0.</div>");
+    updateAllLifecyclePhases();
+
+    Element* body = document().body();
+    Element* one = body->querySelector("#one", ASSERT_NO_EXCEPTION);
+    Node* text = one->firstChild();
+    // |text| node has four inline boxes based on BiIDi level.
+    // Node: "mark 3.1% "(L0) "ARABIC"(L1) "2.0"(L2) "."(L0)
+    // Layout: "mark 3.1% " "2.0" "ARABIC" "."
+    InlineTextBox* const textBox0 = toLayoutText(text->layoutObject())->firstTextBox();
+    InlineTextBox* const textBox1 = textBox0->nextTextBox();
+    InlineTextBox* const textBox2 = textBox1->nextTextBox();
+    InlineTextBox* const textBox3 = textBox2->nextTextBox();
+    ASSERT(textBox3 == toLayoutText(text->layoutObject())->lastTextBox());
+
+    EXPECT_EQ(textPositionOf(textBox0, 0), layoutPositionOf(text, 0));
+    EXPECT_EQ(textPositionOf(textBox0, 1), layoutPositionOf(text, 1));
+    EXPECT_EQ(textPositionOf(textBox0, 9), layoutPositionOf(text, 9));
+
+    EXPECT_EQ(textPositionOf(textBox2, 10), layoutPositionOf(text, 10));
+    EXPECT_EQ(textPositionOf(textBox2, 11), layoutPositionOf(text, 11));
+    EXPECT_EQ(textPositionOf(textBox2, 14), layoutPositionOf(text, 14));
+    EXPECT_EQ(textPositionOf(textBox2, 15), layoutPositionOf(text, 15));
+
+    EXPECT_EQ(textPositionOf(textBox1, 16), layoutPositionOf(text, 16));
+    EXPECT_EQ(textPositionOf(textBox1, 17), layoutPositionOf(text, 17));
+    EXPECT_EQ(textPositionOf(textBox1, 18), layoutPositionOf(text, 18));
+
+    EXPECT_EQ(textPositionOf(textBox3, 19), layoutPositionOf(text, 19));
+}
+
+TEST_F(LayoutPositionTest, ctorRightToLeftWithBidiOverride)
+{
+    setBodyContent("<span id=one dir=rtl>abc <bdo id=two dir=rtl>def</bdo> ghi</span>");
+    updateAllLifecyclePhases();
+
+    Element* body = document().body();
+    Element* one = body->querySelector("#one", ASSERT_NO_EXCEPTION);
+    Element* two = body->querySelector("#two", ASSERT_NO_EXCEPTION);
+
+    Node* firstText = one->firstChild();
+    Node* rtlText = two->firstChild();
+    Node* lastText = one->lastChild();
+
+    InlineTextBox* firstTextBox = toLayoutText(firstText->layoutObject())->lastTextBox();
+    InlineTextBox* rtlTextBox = toLayoutText(rtlText->layoutObject())->firstTextBox();
+    InlineTextBox* lastTextBox = toLayoutText(lastText->layoutObject())->firstTextBox();
+
+    EXPECT_EQ(textPositionOf(firstTextBox, 0), layoutPositionOf(firstText, 0));
+    EXPECT_EQ(textPositionOf(firstTextBox, 1), layoutPositionOf(firstText, 1));
+    EXPECT_EQ(textPositionOf(firstTextBox, 2), layoutPositionOf(firstText, 2));
+
+    EXPECT_EQ(textPositionOf(rtlTextBox, 0), layoutPositionOf(rtlText, 0));
+    EXPECT_EQ(textPositionOf(rtlTextBox, 1), layoutPositionOf(rtlText, 1));
+    EXPECT_EQ(textPositionOf(rtlTextBox, 2), layoutPositionOf(rtlText, 2));
+
+    EXPECT_EQ(textPositionOf(lastTextBox->nextTextBox(), 0), layoutPositionOf(lastText, 0));
+    EXPECT_EQ(textPositionOf(lastTextBox, 1), layoutPositionOf(lastText, 1));
+    EXPECT_EQ(textPositionOf(lastTextBox, 2), layoutPositionOf(lastText, 2));
+    EXPECT_EQ(textPositionOf(lastTextBox, 3), layoutPositionOf(lastText, 3));
+}
+
+TEST_F(LayoutPositionTest, isCaretEquivalentWithBr)
+{
+    setBodyContent("<div>one<br>two</div>");
+    updateAllLifecyclePhases();
+    Element* div = document().querySelector("div", ASSERT_NO_EXCEPTION);
+    Node* one = div->firstChild();
+    Node* two = div->lastChild();
+    Element* br = document().querySelector("br", ASSERT_NO_EXCEPTION);
+
+    const LayoutPosition& beforeBr = layoutPositionBefore(br);
+    const LayoutPosition& afterBr = layoutPositionAfter(br);
+    const LayoutPosition& one3 = layoutPositionOf(one, 3);
+    const LayoutPosition& two0 = layoutPositionOf(two, 0);
+
+    EXPECT_FALSE(beforeBr.isCaretEquivalent(afterBr));
+    EXPECT_TRUE(one3.isCaretEquivalent(beforeBr))
+        << "End of text and before BR should be equivalent.";
+    EXPECT_FALSE(two0.isCaretEquivalent(afterBr))
+        << "Since we can't place caret after BR, after BR and first position of next line aren't equivalent.";
+}
+
+TEST_F(LayoutPositionTest, isCaretEquivalentWithCollapsedWhitespace)
+{
+    setBodyContent("<div>  234  </div>");
+    updateAllLifecyclePhases();
+    Element* div = document().querySelector("div", ASSERT_NO_EXCEPTION);
+    Node* text = div->firstChild();
+
+    const LayoutPosition& before2 = layoutPositionOf(text, 2);
+    EXPECT_TRUE(before2.isCaretEquivalent(layoutPositionOf(text, 0)));
+    EXPECT_TRUE(before2.isCaretEquivalent(layoutPositionOf(text, 1)));
+    EXPECT_FALSE(before2.isCaretEquivalent(layoutPositionBefore(div)));
+    EXPECT_EQ(Position(div, 0), mostBackwardCaretPosition(Position(text, 2)));
+
+    const LayoutPosition& before5 = layoutPositionOf(text, 5);
+    EXPECT_TRUE(before5.isCaretEquivalent(layoutPositionOf(text, 6)));
+    EXPECT_TRUE(before5.isCaretEquivalent(layoutPositionOf(text, 7)));
+    EXPECT_FALSE(before2.isCaretEquivalent(layoutPositionAfter(div)));
+}
+
+TEST_F(LayoutPositionTest, null)
+{
+    EXPECT_TRUE(LayoutPosition().isNull());
+    EXPECT_FALSE(LayoutPosition().isNotNull());
+    EXPECT_TRUE(LayoutPosition() == LayoutPosition());
+    EXPECT_FALSE(LayoutPosition() != LayoutPosition());
+}
+
+} // namespace blink