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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "ui/base/x/x11_window_event_manager.h" | |
| 6 | |
| 7 #include <stddef.h> | |
| 8 #include <X11/Xlib.h> | |
| 9 #include <X11/Xlib-xcb.h> | |
| 10 #include <xcb/xcb.h> | |
| 11 | |
| 12 #include "base/compiler_specific.h" | |
| 13 #include "base/memory/singleton.h" | |
| 14 | |
| 15 namespace ui { | |
| 16 | |
| 17 XScopedEventSelector::XScopedEventSelector(XID xid, uint32_t event_mask) | |
| 18 : xid_(xid), event_mask_(event_mask) { | |
| 19 XWindowEventManager::GetInstance()->SelectEvents(xid_, event_mask_); | |
| 20 } | |
| 21 | |
| 22 XScopedEventSelector::~XScopedEventSelector() { | |
| 23 XWindowEventManager::GetInstance()->DeselectEvents(xid_, event_mask_); | |
| 24 } | |
| 25 | |
| 26 // static | |
| 27 XWindowEventManager* XWindowEventManager::GetInstance() { | |
| 28 return base::Singleton<XWindowEventManager>::get(); | |
| 29 } | |
| 30 | |
| 31 class XWindowEventManager::MultiMask { | |
| 32 public: | |
| 33 MultiMask() { | |
| 34 for (int i = 0; i < kMaskSize; i++) | |
| 35 mask_bits_[i] = 0; | |
| 36 } | |
| 37 | |
| 38 ~MultiMask() {} | |
| 39 | |
| 40 void AddMask(uint32_t mask) { | |
| 41 for (int i = 0; i < kMaskSize; i++) { | |
| 42 if (mask & (1 << i)) | |
| 43 mask_bits_[i]++; | |
| 44 } | |
| 45 } | |
| 46 | |
| 47 void RemoveMask(uint32_t mask) { | |
| 48 for (int i = 0; i < kMaskSize; i++) { | |
| 49 if (mask & (1 << i)) | |
| 50 DCHECK(mask_bits_[i]); | |
| 51 mask_bits_[i]--; | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 uint32_t ToMask() const { | |
| 56 uint32_t mask = NoEventMask; | |
| 57 for (int i = 0; i < kMaskSize; i++) { | |
| 58 if (mask_bits_[i]) | |
| 59 mask |= (1 << i); | |
| 60 } | |
| 61 return mask; | |
| 62 } | |
| 63 | |
| 64 private: | |
| 65 static constexpr auto kMaskSize = 25; | |
| 66 | |
| 67 int mask_bits_[kMaskSize]; | |
| 68 | |
| 69 DISALLOW_COPY_AND_ASSIGN(MultiMask); | |
| 70 }; | |
| 71 | |
| 72 XWindowEventManager::XWindowEventManager() {} | |
| 73 XWindowEventManager::~XWindowEventManager() {} | |
| 74 | |
| 75 void XWindowEventManager::SelectEvents(XID xid, uint32_t event_mask) { | |
| 76 std::unique_ptr<MultiMask>& mask = mask_map_[xid]; | |
| 77 if (!mask) | |
| 78 mask.reset(new MultiMask()); | |
| 79 uint32_t old_mask = mask_map_[xid]->ToMask(); | |
| 80 mask->AddMask(event_mask); | |
| 81 AfterMaskChanged(xid, old_mask); | |
| 82 } | |
| 83 | |
| 84 void XWindowEventManager::DeselectEvents(XID xid, uint32_t event_mask) { | |
| 85 DCHECK(mask_map_.find(xid) != mask_map_.end()); | |
| 86 std::unique_ptr<MultiMask>& mask = mask_map_[xid]; | |
| 87 uint32_t old_mask = mask->ToMask(); | |
| 88 mask->RemoveMask(event_mask); | |
| 89 AfterMaskChanged(xid, old_mask); | |
| 90 } | |
| 91 | |
| 92 void XWindowEventManager::AfterMaskChanged(XID xid, uint32_t old_mask) { | |
| 93 uint32_t new_mask = mask_map_[xid]->ToMask(); | |
| 94 if (new_mask == old_mask) | |
| 95 return; | |
| 96 | |
| 97 XDisplay* display = gfx::GetXDisplay(); | |
| 98 xcb_connection_t* connection = XGetXCBConnection(display); | |
| 99 auto cookie = xcb_change_window_attributes(connection, xid, XCB_CW_EVENT_MASK, | |
| 100 &new_mask); | |
| 101 // Window |xid| may already be destroyed at this point, so the | |
| 102 // change_attributes request may give a BadWindow error. In this case, just | |
| 103 // ignore the error. | |
| 104 xcb_discard_reply(connection, cookie.sequence); | |
| 105 | |
| 106 if (new_mask == NoEventMask) | |
| 107 mask_map_.erase(xid); | |
| 108 } | |
| 109 | |
| 110 } // namespace ui | |
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Chromium Code Reviews
Issue 2326223002:
Revert of Refactor X11ForeignWindowManager (Closed)
