ash/wm/workspace/magnetism_matcher_unittest.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 "ash/wm/workspace/magnetism_matcher.h"

#include "testing/gtest/include/gtest/gtest.h"

namespace ash {

// Trivial test case verifying assertions on left edge.
TEST(MagnetismMatcherTest, TrivialLeft) {
  const int distance = MagnetismMatcher::kMagneticDistance;
  const gfx::Rect initial_bounds(20, 10, 50, 60);
  MagnetismMatcher matcher(initial_bounds, kAllMagnetismEdges);
  EXPECT_FALSE(matcher.AreEdgesObscured());
  MatchedEdge edge;
  EXPECT_FALSE(
      matcher.ShouldAttach(gfx::Rect(initial_bounds.x() - distance - 10,
                                     initial_bounds.y() - distance - 10, 2, 3),
                           &edge));
  EXPECT_FALSE(matcher.AreEdgesObscured());
  EXPECT_TRUE(matcher.ShouldAttach(
      gfx::Rect(initial_bounds.x() - 2, initial_bounds.y(), 1, 1), &edge));
  EXPECT_EQ(MAGNETISM_EDGE_LEFT, edge.primary_edge);
  EXPECT_EQ(SECONDARY_MAGNETISM_EDGE_LEADING, edge.secondary_edge);

  EXPECT_TRUE(
      matcher.ShouldAttach(gfx::Rect(initial_bounds.x() - 2,
                                     initial_bounds.y() + distance + 1, 1, 1),
                           &edge));
  EXPECT_EQ(MAGNETISM_EDGE_LEFT, edge.primary_edge);
  EXPECT_EQ(SECONDARY_MAGNETISM_EDGE_NONE, edge.secondary_edge);
}

// Trivial test case verifying assertions on bottom edge.
TEST(MagnetismMatcherTest, TrivialBottom) {
  const int distance = MagnetismMatcher::kMagneticDistance;
  const gfx::Rect initial_bounds(20, 10, 50, 60);
  MagnetismMatcher matcher(initial_bounds, kAllMagnetismEdges);
  EXPECT_FALSE(matcher.AreEdgesObscured());
  MatchedEdge edge;
  EXPECT_FALSE(
      matcher.ShouldAttach(gfx::Rect(initial_bounds.x() - distance - 10,
                                     initial_bounds.y() - distance - 10, 2, 3),
                           &edge));
  EXPECT_FALSE(matcher.AreEdgesObscured());
  EXPECT_TRUE(matcher.ShouldAttach(
      gfx::Rect(initial_bounds.x() - 2, initial_bounds.bottom() + 4, 10, 1),
      &edge));
  EXPECT_EQ(MAGNETISM_EDGE_BOTTOM, edge.primary_edge);
  EXPECT_EQ(SECONDARY_MAGNETISM_EDGE_LEADING, edge.secondary_edge);

  EXPECT_TRUE(
      matcher.ShouldAttach(gfx::Rect(initial_bounds.x() + distance + 1,
                                     initial_bounds.bottom() + 4, 10, 1),
                           &edge));
  EXPECT_EQ(MAGNETISM_EDGE_BOTTOM, edge.primary_edge);
  EXPECT_EQ(SECONDARY_MAGNETISM_EDGE_NONE, edge.secondary_edge);

  EXPECT_TRUE(
      matcher.ShouldAttach(gfx::Rect(initial_bounds.right() - 10 - 1,
                                     initial_bounds.bottom() + 4, 10, 1),
                           &edge));
  EXPECT_EQ(MAGNETISM_EDGE_BOTTOM, edge.primary_edge);
  EXPECT_EQ(SECONDARY_MAGNETISM_EDGE_TRAILING, edge.secondary_edge);
}

// Verifies we don't match an obscured corner.
TEST(MagnetismMatcherTest, ObscureLeading) {
  const int distance = MagnetismMatcher::kMagneticDistance;
  const gfx::Rect initial_bounds(20, 10, 150, 160);
  MagnetismMatcher matcher(initial_bounds, kAllMagnetismEdges);
  MatchedEdge edge;
  // Overlap with the upper right corner.
  EXPECT_FALSE(
      matcher.ShouldAttach(gfx::Rect(initial_bounds.right() - distance * 2,
                                     initial_bounds.y() - distance - 2,
                                     distance * 3, (distance + 2) * 2),
                           &edge));
  EXPECT_FALSE(matcher.AreEdgesObscured());
  // Verify doesn't match the following which is obscured by first.
  EXPECT_FALSE(matcher.ShouldAttach(
      gfx::Rect(initial_bounds.right() + 1, initial_bounds.y(), distance, 5),
      &edge));
  // Should match the following which extends into non-overlapping region.
  EXPECT_TRUE(matcher.ShouldAttach(
      gfx::Rect(initial_bounds.right() + 1, initial_bounds.y() + distance + 1,
                distance, 15),
      &edge));
  EXPECT_EQ(MAGNETISM_EDGE_RIGHT, edge.primary_edge);
  EXPECT_EQ(SECONDARY_MAGNETISM_EDGE_NONE, edge.secondary_edge);
}

// Verifies obscuring one side doesn't obscure the other.
TEST(MagnetismMatcherTest, DontObscureOtherSide) {
  const int distance = MagnetismMatcher::kMagneticDistance;
  const gfx::Rect initial_bounds(20, 10, 150, 160);
  MagnetismMatcher matcher(initial_bounds, kAllMagnetismEdges);
  MatchedEdge edge;
  // Overlap with the left side.
  EXPECT_FALSE(matcher.ShouldAttach(
      gfx::Rect(initial_bounds.x() - distance + 1, initial_bounds.y() + 2,
                distance * 2 + 2, initial_bounds.height() + distance * 4),
      &edge));
  EXPECT_FALSE(matcher.AreEdgesObscured());
  // Should match the right side since it isn't obscured.
  EXPECT_TRUE(matcher.ShouldAttach(
      gfx::Rect(initial_bounds.right() - 1, initial_bounds.y() + distance + 1,
                distance, 5),
      &edge));
  EXPECT_EQ(MAGNETISM_EDGE_RIGHT, edge.primary_edge);
  EXPECT_EQ(SECONDARY_MAGNETISM_EDGE_NONE, edge.secondary_edge);
}

// Verifies we don't match an obscured center.
TEST(MagnetismMatcherTest, ObscureCenter) {
  const int distance = MagnetismMatcher::kMagneticDistance;
  const gfx::Rect initial_bounds(20, 10, 150, 160);
  MagnetismMatcher matcher(initial_bounds, kAllMagnetismEdges);
  MatchedEdge edge;
  // Overlap with the center bottom edge.
  EXPECT_FALSE(matcher.ShouldAttach(
      gfx::Rect(100, initial_bounds.bottom() - distance - 2, 20,
                (distance + 2) * 2),
      &edge));
  EXPECT_FALSE(matcher.AreEdgesObscured());
  // Verify doesn't match the following which is obscured by first.
  EXPECT_FALSE(matcher.ShouldAttach(
      gfx::Rect(110, initial_bounds.bottom() + 1, 10, 5), &edge));
  // Should match the following which extends into non-overlapping region.
  EXPECT_TRUE(matcher.ShouldAttach(
      gfx::Rect(90, initial_bounds.bottom() + 1, 10, 5), &edge));
  EXPECT_EQ(MAGNETISM_EDGE_BOTTOM, edge.primary_edge);
  EXPECT_EQ(SECONDARY_MAGNETISM_EDGE_NONE, edge.secondary_edge);
}

// Verifies we don't match an obscured trailing edge.
TEST(MagnetismMatcherTest, ObscureTrailing) {
  const int distance = MagnetismMatcher::kMagneticDistance;
  const gfx::Rect initial_bounds(20, 10, 150, 160);
  MagnetismMatcher matcher(initial_bounds, kAllMagnetismEdges);
  MatchedEdge edge;
  // Overlap with the trailing left edge.
  EXPECT_FALSE(matcher.ShouldAttach(
      gfx::Rect(initial_bounds.x() - distance - 2, 150, (distance + 2) * 2, 50),
      &edge));
  EXPECT_FALSE(matcher.AreEdgesObscured());
  // Verify doesn't match the following which is obscured by first.
  EXPECT_FALSE(matcher.ShouldAttach(
      gfx::Rect(initial_bounds.x() - 4, 160, 3, 20), &edge));
  // Should match the following which extends into non-overlapping region.
  EXPECT_TRUE(matcher.ShouldAttach(
      gfx::Rect(initial_bounds.x() - 4, 140, 3, 20), &edge));
  EXPECT_EQ(MAGNETISM_EDGE_LEFT, edge.primary_edge);
  EXPECT_EQ(SECONDARY_MAGNETISM_EDGE_NONE, edge.secondary_edge);
}

}  // namespace ash