| // 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/layout/ng/ng_block_layout_algorithm.h" |
| |
| #include "core/layout/ng/ng_box.h" |
| #include "core/layout/ng/ng_constraint_space.h" |
| #include "core/layout/ng/ng_physical_fragment.h" |
| #include "core/layout/ng/ng_length_utils.h" |
| #include "core/style/ComputedStyle.h" |
| #include "testing/gtest/include/gtest/gtest.h" |
| |
| namespace blink { |
| namespace { |
| |
| class NGBlockLayoutAlgorithmTest : public ::testing::Test { |
| protected: |
| void SetUp() override { style_ = ComputedStyle::create(); } |
| |
| RefPtr<ComputedStyle> style_; |
| }; |
| |
| TEST_F(NGBlockLayoutAlgorithmTest, FixedSize) { |
| style_->setWidth(Length(30, Fixed)); |
| style_->setHeight(Length(40, Fixed)); |
| |
| NGConstraintSpace* space = new NGConstraintSpace( |
| HorizontalTopBottom, NGLogicalSize(LayoutUnit(100), NGSizeIndefinite)); |
| |
| NGBlockLayoutAlgorithm algorithm(style_, nullptr); |
| NGPhysicalFragment* frag; |
| while (!algorithm.Layout(space, &frag)) |
| ; |
| EXPECT_EQ(frag->Width(), LayoutUnit(30)); |
| EXPECT_EQ(frag->Height(), LayoutUnit(40)); |
| } |
| |
| // Verifies that two children are laid out with the correct size and position. |
| TEST_F(NGBlockLayoutAlgorithmTest, LayoutBlockChildren) { |
| const int kWidth = 30; |
| const int kHeight1 = 20; |
| const int kHeight2 = 30; |
| const int kMarginTop = 5; |
| const int kMarginBottom = 20; |
| style_->setWidth(Length(kWidth, Fixed)); |
| |
| NGConstraintSpace* space = new NGConstraintSpace( |
| HorizontalTopBottom, NGLogicalSize(LayoutUnit(100), NGSizeIndefinite)); |
| |
| RefPtr<ComputedStyle> first_style = ComputedStyle::create(); |
| first_style->setHeight(Length(kHeight1, Fixed)); |
| NGBox* first_child = new NGBox(first_style.get()); |
| |
| RefPtr<ComputedStyle> second_style = ComputedStyle::create(); |
| second_style->setHeight(Length(kHeight2, Fixed)); |
| second_style->setMarginTop(Length(kMarginTop, Fixed)); |
| second_style->setMarginBottom(Length(kMarginBottom, Fixed)); |
| NGBox* second_child = new NGBox(second_style.get()); |
| |
| first_child->SetNextSibling(second_child); |
| |
| NGBlockLayoutAlgorithm algorithm(style_, first_child); |
| NGPhysicalFragment* frag; |
| while (!algorithm.Layout(space, &frag)) |
| ; |
| EXPECT_EQ(frag->Width(), LayoutUnit(kWidth)); |
| EXPECT_EQ(frag->Height(), LayoutUnit(kHeight1 + kHeight2 + kMarginTop)); |
| EXPECT_EQ(frag->Type(), NGPhysicalFragmentBase::FragmentBox); |
| ASSERT_EQ(frag->Children().size(), 2UL); |
| |
| const NGPhysicalFragmentBase* child = frag->Children()[0]; |
| EXPECT_EQ(child->Height(), kHeight1); |
| EXPECT_EQ(child->TopOffset(), 0); |
| |
| child = frag->Children()[1]; |
| EXPECT_EQ(child->Height(), kHeight2); |
| EXPECT_EQ(child->TopOffset(), kHeight1 + kMarginTop); |
| } |
| |
| // Verifies the collapsing margins case for the next pair: |
| // - top margin of a box and top margin of its first in-flow child. |
| // |
| // Test case's HTML representation: |
| // <div style="margin-top: 20px; height: 50px;"> <!-- DIV1 --> |
| // <div style="margin-top: 10px"></div> <!-- DIV2 --> |
| // </div> |
| // |
| // Expected: |
| // Margins are collapsed resulting a single margin 20px = max(20px, 10px) |
| TEST_F(NGBlockLayoutAlgorithmTest, CollapsingMarginsCase1) { |
| const int kHeight = 50; |
| const int kDiv1MarginTop = 20; |
| const int kDiv2MarginTop = 10; |
| |
| // DIV1 |
| RefPtr<ComputedStyle> div1_style = ComputedStyle::create(); |
| div1_style->setHeight(Length(kHeight, Fixed)); |
| div1_style->setMarginTop(Length(kDiv1MarginTop, Fixed)); |
| NGBox* div1 = new NGBox(div1_style.get()); |
| |
| // DIV2 |
| RefPtr<ComputedStyle> div2_style = ComputedStyle::create(); |
| div2_style->setMarginTop(Length(kDiv2MarginTop, Fixed)); |
| NGBox* div2 = new NGBox(div2_style.get()); |
| |
| div1->SetFirstChild(div2); |
| |
| NGConstraintSpace* space = new NGConstraintSpace( |
| HorizontalTopBottom, NGLogicalSize(LayoutUnit(100), NGSizeIndefinite)); |
| NGBlockLayoutAlgorithm algorithm(style_, div1); |
| NGPhysicalFragment* frag; |
| while (!algorithm.Layout(space, &frag)) |
| ; |
| |
| EXPECT_EQ(frag->MarginStrut().margin_block_start, kDiv1MarginTop); |
| ASSERT_EQ(frag->Children().size(), 1UL); |
| const NGPhysicalFragmentBase* div2_fragment = frag->Children()[0]; |
| EXPECT_EQ(div2_fragment->MarginStrut().margin_block_start, kDiv2MarginTop); |
| } |
| |
| // Verifies the collapsing margins case for the next pair: |
| // - bottom margin of box and top margin of its next in-flow following sibling. |
| // |
| // Test case's HTML representation: |
| // <div style="margin-bottom: 20px; height: 50px;"> <!-- DIV1 --> |
| // <div style="margin-bottom: -15px"></div> <!-- DIV2 --> |
| // </div> |
| // <div style="margin-top: 10px; height: 50px;"> <!-- DIV3 --> |
| // <div style="margin-top: -30px"></div> <!-- DIV4 --> |
| // </div> |
| // |
| // Expected: |
| // Margins are collapsed resulting an overlap |
| // -10px = max(20px, 10px) - max(abs(-15px), abs(-30px)) |
| // between DIV2 and DIV3. |
| TEST_F(NGBlockLayoutAlgorithmTest, CollapsingMarginsCase2) { |
| const int kHeight = 50; |
| const int kDiv1MarginBottom = 20; |
| const int kDiv2MarginBottom = -15; |
| const int kDiv3MarginTop = 10; |
| const int kDiv4MarginTop = -30; |
| const int kExpectedCollapsedMargin = -10; |
| |
| // DIV1 |
| RefPtr<ComputedStyle> div1_style = ComputedStyle::create(); |
| div1_style->setHeight(Length(kHeight, Fixed)); |
| div1_style->setMarginBottom(Length(kDiv1MarginBottom, Fixed)); |
| NGBox* div1 = new NGBox(div1_style.get()); |
| |
| // DIV2 |
| RefPtr<ComputedStyle> div2_style = ComputedStyle::create(); |
| div2_style->setMarginBottom(Length(kDiv2MarginBottom, Fixed)); |
| NGBox* div2 = new NGBox(div2_style.get()); |
| |
| // DIV3 |
| RefPtr<ComputedStyle> div3_style = ComputedStyle::create(); |
| div3_style->setHeight(Length(kHeight, Fixed)); |
| div3_style->setMarginTop(Length(kDiv3MarginTop, Fixed)); |
| NGBox* div3 = new NGBox(div3_style.get()); |
| |
| // DIV4 |
| RefPtr<ComputedStyle> div4_style = ComputedStyle::create(); |
| div4_style->setMarginTop(Length(kDiv4MarginTop, Fixed)); |
| NGBox* div4 = new NGBox(div4_style.get()); |
| |
| div1->SetFirstChild(div2); |
| div3->SetFirstChild(div4); |
| div1->SetNextSibling(div3); |
| |
| NGConstraintSpace* space = new NGConstraintSpace( |
| HorizontalTopBottom, NGLogicalSize(LayoutUnit(100), NGSizeIndefinite)); |
| NGBlockLayoutAlgorithm algorithm(style_, div1); |
| NGPhysicalFragment* frag; |
| while (!algorithm.Layout(space, &frag)) |
| ; |
| |
| ASSERT_EQ(frag->Children().size(), 2UL); |
| |
| const NGPhysicalFragmentBase* child = frag->Children()[0]; |
| EXPECT_EQ(child->Height(), kHeight); |
| EXPECT_EQ(child->TopOffset(), 0); |
| |
| child = frag->Children()[1]; |
| EXPECT_EQ(child->Height(), kHeight); |
| EXPECT_EQ(child->TopOffset(), kHeight + kExpectedCollapsedMargin); |
| } |
| } // namespace |
| } // namespace blink |