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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef ASH_WM_COMMON_WORKSPACE_MAGNETISM_MATCHER_H_ | 5 #ifndef ASH_WM_COMMON_WORKSPACE_MAGNETISM_MATCHER_H_ |
6 #define ASH_WM_COMMON_WORKSPACE_MAGNETISM_MATCHER_H_ | 6 #define ASH_WM_COMMON_WORKSPACE_MAGNETISM_MATCHER_H_ |
7 | 7 |
8 #include <stdint.h> | 8 #include <stdint.h> |
9 | 9 |
10 #include <utility> | 10 #include <utility> |
11 #include <vector> | 11 #include <vector> |
12 | 12 |
13 #include "ash/wm/common/ash_wm_common_export.h" | 13 #include "ash/ash_export.h" |
14 #include "base/compiler_specific.h" | 14 #include "base/compiler_specific.h" |
15 #include "base/logging.h" | 15 #include "base/logging.h" |
16 #include "base/macros.h" | 16 #include "base/macros.h" |
17 #include "base/memory/scoped_vector.h" | 17 #include "base/memory/scoped_vector.h" |
18 #include "ui/gfx/geometry/rect.h" | 18 #include "ui/gfx/geometry/rect.h" |
19 | 19 |
20 namespace ash { | 20 namespace ash { |
21 | 21 |
22 enum MagnetismEdge { | 22 enum MagnetismEdge { |
23 MAGNETISM_EDGE_TOP = 1 << 0, | 23 MAGNETISM_EDGE_TOP = 1 << 0, |
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150 SecondaryMagnetismEdge secondary_edge; | 150 SecondaryMagnetismEdge secondary_edge; |
151 }; | 151 }; |
152 | 152 |
153 // MagnetismMatcher is used to test if a window should snap to another window. | 153 // MagnetismMatcher is used to test if a window should snap to another window. |
154 // To use MagnetismMatcher do the following: | 154 // To use MagnetismMatcher do the following: |
155 // . Create it with the bounds of the window being dragged. | 155 // . Create it with the bounds of the window being dragged. |
156 // . Iterate over the child windows checking if the window being dragged should | 156 // . Iterate over the child windows checking if the window being dragged should |
157 // attach to it using ShouldAttach(). | 157 // attach to it using ShouldAttach(). |
158 // . Use AreEdgesObscured() to test if no other windows can match (because all | 158 // . Use AreEdgesObscured() to test if no other windows can match (because all |
159 // edges are completely obscured). | 159 // edges are completely obscured). |
160 class ASH_WM_COMMON_EXPORT MagnetismMatcher { | 160 class ASH_EXPORT MagnetismMatcher { |
161 public: | 161 public: |
162 static const int kMagneticDistance; | 162 static const int kMagneticDistance; |
163 | 163 |
164 // |edges| is a bitmask of MagnetismEdges to match against. | 164 // |edges| is a bitmask of MagnetismEdges to match against. |
165 MagnetismMatcher(const gfx::Rect& bounds, uint32_t edges); | 165 MagnetismMatcher(const gfx::Rect& bounds, uint32_t edges); |
166 ~MagnetismMatcher(); | 166 ~MagnetismMatcher(); |
167 | 167 |
168 // Returns true if |bounds| is close enough to the initial bounds that the two | 168 // Returns true if |bounds| is close enough to the initial bounds that the two |
169 // should be attached. If true is returned |edge| is set to indicates how the | 169 // should be attached. If true is returned |edge| is set to indicates how the |
170 // two should snap together. See description of MatchedEdge for details. | 170 // two should snap together. See description of MatchedEdge for details. |
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183 const int32_t edges_; | 183 const int32_t edges_; |
184 | 184 |
185 ScopedVector<MagnetismEdgeMatcher> matchers_; | 185 ScopedVector<MagnetismEdgeMatcher> matchers_; |
186 | 186 |
187 DISALLOW_COPY_AND_ASSIGN(MagnetismMatcher); | 187 DISALLOW_COPY_AND_ASSIGN(MagnetismMatcher); |
188 }; | 188 }; |
189 | 189 |
190 } // namespace ash | 190 } // namespace ash |
191 | 191 |
192 #endif // ASH_WM_COMMON_WORKSPACE_MAGNETISM_MATCHER_H_ | 192 #endif // ASH_WM_COMMON_WORKSPACE_MAGNETISM_MATCHER_H_ |
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