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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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