event_utils.h revision 03b57e008b61dfcb1fbad3aea950ae0e001748b0
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 3// found in the LICENSE file. 4 5#ifndef UI_EVENTS_EVENT_UTILS_H_ 6#define UI_EVENTS_EVENT_UTILS_H_ 7 8#include "base/event_types.h" 9#include "base/memory/scoped_ptr.h" 10#include "ui/events/event_constants.h" 11#include "ui/events/keycodes/keyboard_codes.h" 12#include "ui/gfx/display.h" 13#include "ui/gfx/native_widget_types.h" 14#include "ui/events/events_export.h" 15 16#if defined(OS_WIN) 17#include <windows.h> 18#endif 19 20namespace gfx { 21class Point; 22class Vector2d; 23} 24 25namespace base { 26class TimeDelta; 27} 28 29namespace ui { 30 31class Event; 32class MouseEvent; 33 34// Updates the list of devices for cached properties. 35EVENTS_EXPORT void UpdateDeviceList(); 36 37// Returns a ui::Event wrapping a native event. Ownership of the returned value 38// is transferred to the caller. 39EVENTS_EXPORT scoped_ptr<Event> EventFromNative( 40 const base::NativeEvent& native_event); 41 42// Get the EventType from a native event. 43EVENTS_EXPORT EventType EventTypeFromNative( 44 const base::NativeEvent& native_event); 45 46// Get the EventFlags from a native event. 47EVENTS_EXPORT int EventFlagsFromNative(const base::NativeEvent& native_event); 48 49// Get the timestamp from a native event. 50EVENTS_EXPORT base::TimeDelta EventTimeFromNative( 51 const base::NativeEvent& native_event); 52 53// Create a timestamp based on the current time. 54EVENTS_EXPORT base::TimeDelta EventTimeForNow(); 55 56// Get the location from a native event. The coordinate system of the resultant 57// |Point| has the origin at top-left of the "root window". The nature of 58// this "root window" and how it maps to platform-specific drawing surfaces is 59// defined in ui/aura/root_window.* and ui/aura/window_tree_host*. 60// TODO(tdresser): Return gfx::PointF here. See crbug.com/337827. 61EVENTS_EXPORT gfx::Point EventLocationFromNative( 62 const base::NativeEvent& native_event); 63 64// Gets the location in native system coordinate space. 65EVENTS_EXPORT gfx::Point EventSystemLocationFromNative( 66 const base::NativeEvent& native_event); 67 68#if defined(USE_X11) 69// Returns the 'real' button for an event. The button reported in slave events 70// does not take into account any remapping (e.g. using xmodmap), while the 71// button reported in master events do. This is a utility function to always 72// return the mapped button. 73EVENTS_EXPORT int EventButtonFromNative(const base::NativeEvent& native_event); 74#endif 75 76// Returns the KeyboardCode from a native event. 77EVENTS_EXPORT KeyboardCode KeyboardCodeFromNative( 78 const base::NativeEvent& native_event); 79 80// Returns the DOM KeyboardEvent code (physical location in the 81// keyboard) from a native event. The ownership of the return value 82// is NOT trasferred to the caller. 83EVENTS_EXPORT const char* CodeFromNative( 84 const base::NativeEvent& native_event); 85 86// Returns the platform related key code. For X11, it is xksym value. 87EVENTS_EXPORT uint32 PlatformKeycodeFromNative( 88 const base::NativeEvent& native_event); 89 90// Returns the windows key code. Note that this value is different from 91// KeyboardCodeFromNative (there is a divergence between ui::KeyboardCode and 92// windows key codes). 93EVENTS_EXPORT uint32 WindowsKeycodeFromNative( 94 const base::NativeEvent& native_event); 95 96// Returns the text generated by this keystroke. Used in the value we pass to 97// blink. 98EVENTS_EXPORT uint16 TextFromNative(const base::NativeEvent& native_event); 99 100// Returns the unmodified text generated by this keystroke. Used in the value 101// we pass to blink. 102EVENTS_EXPORT uint16 UnmodifiedTextFromNative( 103 const base::NativeEvent& native_event); 104 105#if defined(OS_LINUX) 106// Returns a control character sequences from a |windows_key_code|. 107EVENTS_EXPORT uint16 GetControlCharacterForKeycode(int windows_key_code, 108 bool shift); 109#endif 110 111// Returns true if the keyboard event is a character event rather than 112// a keystroke event. 113EVENTS_EXPORT bool IsCharFromNative(const base::NativeEvent& native_event); 114 115// Returns the flags of the button that changed during a press/release. 116EVENTS_EXPORT int GetChangedMouseButtonFlagsFromNative( 117 const base::NativeEvent& native_event); 118 119// Gets the mouse wheel offsets from a native event. 120EVENTS_EXPORT gfx::Vector2d GetMouseWheelOffset( 121 const base::NativeEvent& native_event); 122 123// Returns a copy of |native_event|. Depending on the platform, this copy may 124// need to be deleted with ReleaseCopiedNativeEvent(). 125base::NativeEvent CopyNativeEvent( 126 const base::NativeEvent& native_event); 127 128// Delete a |native_event| previously created by CopyNativeEvent(). 129void ReleaseCopiedNativeEvent( 130 const base::NativeEvent& native_event); 131 132// Gets the touch id from a native event. 133EVENTS_EXPORT int GetTouchId(const base::NativeEvent& native_event); 134 135// Increases the number of times |ClearTouchIdIfReleased| needs to be called on 136// an event with a given touch id before it will actually be cleared. 137EVENTS_EXPORT void IncrementTouchIdRefCount( 138 const base::NativeEvent& native_event); 139 140// Clear the touch id from bookkeeping if it is a release/cancel event. 141EVENTS_EXPORT void ClearTouchIdIfReleased( 142 const base::NativeEvent& native_event); 143 144// Gets the radius along the X/Y axis from a native event. Default is 1.0. 145EVENTS_EXPORT float GetTouchRadiusX(const base::NativeEvent& native_event); 146EVENTS_EXPORT float GetTouchRadiusY(const base::NativeEvent& native_event); 147 148// Gets the angle of the major axis away from the X axis. Default is 0.0. 149EVENTS_EXPORT float GetTouchAngle(const base::NativeEvent& native_event); 150 151// Gets the force from a native_event. Normalized to be [0, 1]. Default is 0.0. 152EVENTS_EXPORT float GetTouchForce(const base::NativeEvent& native_event); 153 154// Gets the fling velocity from a native event. is_cancel is set to true if 155// this was a tap down, intended to stop an ongoing fling. 156EVENTS_EXPORT bool GetFlingData(const base::NativeEvent& native_event, 157 float* vx, 158 float* vy, 159 float* vx_ordinal, 160 float* vy_ordinal, 161 bool* is_cancel); 162 163// Returns whether this is a scroll event and optionally gets the amount to be 164// scrolled. |x_offset|, |y_offset| and |finger_count| can be NULL. 165EVENTS_EXPORT bool GetScrollOffsets(const base::NativeEvent& native_event, 166 float* x_offset, 167 float* y_offset, 168 float* x_offset_ordinal, 169 float* y_offset_ordinal, 170 int* finger_count); 171 172// Returns whether natural scrolling should be used for touchpad. 173EVENTS_EXPORT bool ShouldDefaultToNaturalScroll(); 174 175// Returns whether or not the internal display produces touch events. 176EVENTS_EXPORT gfx::Display::TouchSupport GetInternalDisplayTouchSupport(); 177 178#if defined(OS_WIN) 179EVENTS_EXPORT int GetModifiersFromACCEL(const ACCEL& accel); 180EVENTS_EXPORT int GetModifiersFromKeyState(); 181 182// Returns true if |message| identifies a mouse event that was generated as the 183// result of a touch event. 184EVENTS_EXPORT bool IsMouseEventFromTouch(UINT message); 185 186// Converts scan code and lParam each other. The scan code 187// representing an extended key contains 0xE000 bits. 188EVENTS_EXPORT uint16 GetScanCodeFromLParam(LPARAM lParam); 189EVENTS_EXPORT LPARAM GetLParamFromScanCode(uint16 scan_code); 190 191#endif 192 193#if defined(USE_X11) 194// Update the native X11 event to correspond to the new flags. 195EVENTS_EXPORT void UpdateX11EventForFlags(Event* event); 196// Update the native X11 event to correspond to the new button flags. 197EVENTS_EXPORT void UpdateX11EventForChangedButtonFlags(MouseEvent* event); 198#endif 199 200// Registers a custom event type. 201EVENTS_EXPORT int RegisterCustomEventType(); 202 203} // namespace ui 204 205#endif // UI_EVENTS_EVENT_UTILS_H_ 206