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// 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.
#ifndef UI_EVENTS_X_DEVICE_LIST_CACHE_X_H_
#define UI_EVENTS_X_DEVICE_LIST_CACHE_X_H_
#include <X11/extensions/XInput.h>
#include <X11/extensions/XInput2.h>
#include <map>
#include "base/basictypes.h"
#include "ui/events/events_base_export.h"
template <typename T> struct DefaultSingletonTraits;
typedef struct _XDisplay Display;
template <typename T>
struct DeviceList {
DeviceList() : devices(NULL), count(0) {
}
T& operator[] (int x) {
return devices[x];
}
const T& operator[](int x) const { return devices[x]; }
T* devices;
int count;
};
typedef struct DeviceList<XDeviceInfo> XDeviceList;
typedef struct DeviceList<XIDeviceInfo> XIDeviceList;
namespace ui {
// A class to cache the current XInput device list. This minimized the
// round-trip time to the X server whenever such a device list is needed. The
// update function will be called on each incoming XI_HierarchyChanged event.
class EVENTS_BASE_EXPORT DeviceListCacheX {
public:
static DeviceListCacheX* GetInstance();
void UpdateDeviceList(Display* display);
// Returns the list of devices associated with |display|. Uses the old X11
// protocol to get the list of the devices.
const XDeviceList& GetXDeviceList(Display* display);
// Returns the list of devices associated with |display|. Uses the newer
// XINPUT2 protocol to get the list of devices. Before making this call, make
// sure that XInput2 support is available (e.g. by calling
// IsXInput2Available()).
const XIDeviceList& GetXI2DeviceList(Display* display);
private:
friend struct DefaultSingletonTraits<DeviceListCacheX>;
DeviceListCacheX();
~DeviceListCacheX();
std::map<Display*, XDeviceList> x_dev_list_map_;
std::map<Display*, XIDeviceList> xi_dev_list_map_;
DISALLOW_COPY_AND_ASSIGN(DeviceListCacheX);
};
} // namespace ui
#endif // UI_EVENTS_X_DEVICE_LIST_CACHE_X_H_
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