ppapi/c/pp_input_event.h - chromium/src - Git at Google

 /* 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.
  */

 /* From pp_input_event.idl modified Thu Mar 28 10:52:59 2013. */

 #ifndef PPAPI_C_PP_INPUT_EVENT_H_
 #define PPAPI_C_PP_INPUT_EVENT_H_

 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/c/ppb_input_event.h"

 /**
  * @file
  * This file defines the API used to handle mouse and keyboard input events.
  */


 /**
  * @addtogroup Structs
  * @{
  */
 /**
  * The <code>PP_InputEvent_Key</code> struct represents a key up or key down
  * event.
  *
  * Key up and key down events correspond to physical keys on the keyboard. The
  * actual character that the user typed (if any) will be delivered in a
  * "character" event.
  *
  * If the user loses focus on the module while a key is down, a key up
  * event might not occur. For example, if the module has focus and the user
  * presses and holds the shift key, the module will see a "shift down" message.
  * Then if the user clicks elsewhere on the web page, the module's focus will
  * be lost and no more input events will be delivered.
  *
  * If your module depends on receiving key up events, it should also handle
  * "lost focus" as the equivalent of "all keys up."
  */
 struct PP_InputEvent_Key {
   /** This value is a bit field combination of the EVENT_MODIFIER flags. */
   uint32_t modifier;
   /**
    * This value reflects the DOM KeyboardEvent <code>keyCode</code> field.
    * Chrome populates this with the Windows-style Virtual Key code of the key.
    */
   uint32_t key_code;
 };
 PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_InputEvent_Key, 8);

 /**
  * The <code>PP_InputEvent_Character</code> struct represents a typed character
  * event.
  *
  * Normally, the program will receive a key down event, followed by a character
  * event, followed by a key up event. The character event will have any
  * modifier keys applied. Obvious examples are symbols, where Shift-5 gives you
  * a '%'. The key down and up events will give you the scan code for the "5"
  * key, and the character event will give you the '%' character.
  *
  * You may not get a character event for all key down events if the key doesn't
  * generate a character. Likewise, you may actually get multiple character
  * events in a row. For example, some locales have an accent key that modifies
  * the next character typed. You might get this stream of events: accent down,
  * accent up (it didn't generate a character), letter key down, letter with
  * accent character event (it was modified by the previous accent key), letter
  * key up.  If the letter can't be combined with the accent, like an umlaut and
  * an 'R', the system might send umlaut down, umlaut up, 'R' key down, umlaut
  * character (can't combine it with 'R', so just send the raw umlaut so it
  * isn't lost"), 'R' character event, 'R' key up.
  */
 struct PP_InputEvent_Character {
   /** A combination of the <code>PP_InputEvent_Modifier</code> flags. */
   uint32_t modifier;
   /**
    * This value represents the typed character as a single null-terminated UTF-8
    * character. Any unused bytes will be filled with null bytes. Since the
    * maximum UTF-8 character is 4 bytes, there will always be at least one null
    * at the end so you can treat this as a null-terminated UTF-8 string.
    */
   int8_t text[5];
 };
 PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_InputEvent_Character, 12);

 /**
  * The <code>PP_InputEvent_Mouse</code> struct represents all mouse events
  * except mouse wheel events.
  */
 struct PP_InputEvent_Mouse {
   /**
    * This value is a bit field combination of the
    * <code>PP_InputEvent_Modifier</code> flags.
    */
   uint32_t modifier;
   /**
    * This value represents the button that changed for mouse down or up events.
    * This value will be <code>PP_EVENT_MOUSEBUTTON_NONE</code> for mouse move,
    * enter, and leave events.
    */
   PP_InputEvent_MouseButton button;
   /**
    * This values represents the x coordinate of the mouse when the event
    * occurred.
    *
    * In most, but not all, cases these coordinates will just be integers.
    * For example, the plugin element might be arbitrarily scaled or transformed
    * in the DOM, and translating a mouse event into the coordinate space of the
    * plugin will give non-integer values.
    */
   float x;
   /**
    * This values represents the y coordinate of the mouse when the event
    * occurred.
    *
    * In most, but not all, cases these coordinates will just be integers.
    * For example, the plugin element might be arbitrarily scaled or transformed
    * in the DOM, and translating a mouse event into the coordinate space of the
    * plugin will give non-integer values.
    */
   float y;
   int32_t click_count;
 };
 PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_InputEvent_Mouse, 20);

 /**
  * The <code>PP_InputEvent_Wheel</code> struct represents all mouse wheel
  * events.
  */
 struct PP_InputEvent_Wheel {
   /**
    * This value represents a combination of the <code>EVENT_MODIFIER</code>
    * flags.
    */
   uint32_t modifier;
   /**
    * The mouse wheel's horizontal scroll amount. A scroll to the right
    * (where the content moves left) is represented as positive values,
    * and a scroll to the left (where the content moves right) is
    * represented as negative values.
    *
    * The units are either in pixels (when scroll_by_page is false) or pages
    * (when scroll_by_page is true). For example, delta_y = -3 means scroll up 3
    * pixels when scroll_by_page is false, and scroll up 3 pages when
    * scroll_by_page is true.
    *
    * This amount is system dependent and will take into account the user's
    * preferred scroll sensitivity and potentially also nonlinear acceleration
    * based on the speed of the scrolling.
    *
    * Devices will be of varying resolution. Some mice with large detents will
    * only generate integer scroll amounts. But fractional values are also
    * possible, for example, on some trackpads and newer mice that don't have
    * "clicks".
    */
   float delta_x;
   /**
    * The mouse wheel's vertical scroll amount. A scroll down (where the
    * content moves up) is represented as positive values, and a scroll up
    * (where the content moves down) is represented as negative values.
    *
    * The units are either in pixels (when scroll_by_page is false) or pages
    * (when scroll_by_page is true). For example, delta_y = -3 means scroll up 3
    * pixels when scroll_by_page is false, and scroll up 3 pages when
    * scroll_by_page is true.
    *
    * This amount is system dependent and will take into account the user's
    * preferred scroll sensitivity and potentially also nonlinear acceleration
    * based on the speed of the scrolling.
    *
    * Devices will be of varying resolution. Some mice with large detents will
    * only generate integer scroll amounts. But fractional values are also
    * possible, for example, on some trackpads and newer mice that don't have
    * "clicks".
    */
   float delta_y;
   /**
    * The number of "clicks" of the scroll wheel that have produced the
    * event. The value may have system-specific acceleration applied to it,
    * depending on the device. The positive and negative meanings are the same
    * as for <code>delta_x</code> and <code>delta_y</code>.
    *
    * If you are scrolling, you probably want to use the delta values above.
    * These tick events can be useful if you aren't doing actual scrolling and
    * don't want or pixel values. An example may be cycling between different
    * items in a game.
    *
    * You may receive fractional values for the wheel ticks if the mouse wheel
    * is high resolution or doesn't have "clicks". If your program wants
    * discrete events (as in the "picking items" example) you should accumulate
    * fractional click values from multiple messages until the total value
    * reaches positive or negative one. This should represent a similar amount
    * of scrolling as for a mouse that has a discrete mouse wheel.
    */
   float wheel_ticks_x;
   /** This value represents */
   float wheel_ticks_y;
   /**
    * Indicates if the scroll <code>delta_x</code>/<code>delta_y</code>
    * indicates pages or lines to scroll by. When true, the user is requesting
    * to scroll by pages.
    */
   PP_Bool scroll_by_page;
 };
 PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_InputEvent_Wheel, 24);
 /**
  * @}
  */

 #endif  /* PPAPI_C_PP_INPUT_EVENT_H_ */
	/* 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.
	*/

	/* From pp_input_event.idl modified Thu Mar 28 10:52:59 2013. */

	#ifndef PPAPI_C_PP_INPUT_EVENT_H_
	#define PPAPI_C_PP_INPUT_EVENT_H_

	#include "ppapi/c/pp_bool.h"
	#include "ppapi/c/pp_macros.h"
	#include "ppapi/c/pp_stdint.h"
	#include "ppapi/c/ppb_input_event.h"

	/**
	* @file
	* This file defines the API used to handle mouse and keyboard input events.
	*/


	/**
	* @addtogroup Structs
	* @{
	*/
	/**
	* The <code>PP_InputEvent_Key</code> struct represents a key up or key down
	* event.
	*
	* Key up and key down events correspond to physical keys on the keyboard. The
	* actual character that the user typed (if any) will be delivered in a
	* "character" event.
	*
	* If the user loses focus on the module while a key is down, a key up
	* event might not occur. For example, if the module has focus and the user
	* presses and holds the shift key, the module will see a "shift down" message.
	* Then if the user clicks elsewhere on the web page, the module's focus will
	* be lost and no more input events will be delivered.
	*
	* If your module depends on receiving key up events, it should also handle
	* "lost focus" as the equivalent of "all keys up."
	*/
	struct PP_InputEvent_Key {
	/** This value is a bit field combination of the EVENT_MODIFIER flags. */
	uint32_t modifier;
	/**
	* This value reflects the DOM KeyboardEvent <code>keyCode</code> field.
	* Chrome populates this with the Windows-style Virtual Key code of the key.
	*/
	uint32_t key_code;
	};
	PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_InputEvent_Key, 8);

	/**
	* The <code>PP_InputEvent_Character</code> struct represents a typed character
	* event.
	*
	* Normally, the program will receive a key down event, followed by a character
	* event, followed by a key up event. The character event will have any
	* modifier keys applied. Obvious examples are symbols, where Shift-5 gives you
	* a '%'. The key down and up events will give you the scan code for the "5"
	* key, and the character event will give you the '%' character.
	*
	* You may not get a character event for all key down events if the key doesn't
	* generate a character. Likewise, you may actually get multiple character
	* events in a row. For example, some locales have an accent key that modifies
	* the next character typed. You might get this stream of events: accent down,
	* accent up (it didn't generate a character), letter key down, letter with
	* accent character event (it was modified by the previous accent key), letter
	* key up. If the letter can't be combined with the accent, like an umlaut and
	* an 'R', the system might send umlaut down, umlaut up, 'R' key down, umlaut
	* character (can't combine it with 'R', so just send the raw umlaut so it
	* isn't lost"), 'R' character event, 'R' key up.
	*/
	struct PP_InputEvent_Character {
	/** A combination of the <code>PP_InputEvent_Modifier</code> flags. */
	uint32_t modifier;
	/**
	* This value represents the typed character as a single null-terminated UTF-8
	* character. Any unused bytes will be filled with null bytes. Since the
	* maximum UTF-8 character is 4 bytes, there will always be at least one null
	* at the end so you can treat this as a null-terminated UTF-8 string.
	*/
	int8_t text[5];
	};
	PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_InputEvent_Character, 12);

	/**
	* The <code>PP_InputEvent_Mouse</code> struct represents all mouse events
	* except mouse wheel events.
	*/
	struct PP_InputEvent_Mouse {
	/**
	* This value is a bit field combination of the
	* <code>PP_InputEvent_Modifier</code> flags.
	*/
	uint32_t modifier;
	/**
	* This value represents the button that changed for mouse down or up events.
	* This value will be <code>PP_EVENT_MOUSEBUTTON_NONE</code> for mouse move,
	* enter, and leave events.
	*/
	PP_InputEvent_MouseButton button;
	/**
	* This values represents the x coordinate of the mouse when the event
	* occurred.
	*
	* In most, but not all, cases these coordinates will just be integers.
	* For example, the plugin element might be arbitrarily scaled or transformed
	* in the DOM, and translating a mouse event into the coordinate space of the
	* plugin will give non-integer values.
	*/
	float x;
	/**
	* This values represents the y coordinate of the mouse when the event
	* occurred.
	*
	* In most, but not all, cases these coordinates will just be integers.
	* For example, the plugin element might be arbitrarily scaled or transformed
	* in the DOM, and translating a mouse event into the coordinate space of the
	* plugin will give non-integer values.
	*/
	float y;
	int32_t click_count;
	};
	PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_InputEvent_Mouse, 20);

	/**
	* The <code>PP_InputEvent_Wheel</code> struct represents all mouse wheel
	* events.
	*/
	struct PP_InputEvent_Wheel {
	/**
	* This value represents a combination of the <code>EVENT_MODIFIER</code>
	* flags.
	*/
	uint32_t modifier;
	/**
	* The mouse wheel's horizontal scroll amount. A scroll to the right
	* (where the content moves left) is represented as positive values,
	* and a scroll to the left (where the content moves right) is
	* represented as negative values.
	*
	* The units are either in pixels (when scroll_by_page is false) or pages
	* (when scroll_by_page is true). For example, delta_y = -3 means scroll up 3
	* pixels when scroll_by_page is false, and scroll up 3 pages when
	* scroll_by_page is true.
	*
	* This amount is system dependent and will take into account the user's
	* preferred scroll sensitivity and potentially also nonlinear acceleration
	* based on the speed of the scrolling.
	*
	* Devices will be of varying resolution. Some mice with large detents will
	* only generate integer scroll amounts. But fractional values are also
	* possible, for example, on some trackpads and newer mice that don't have
	* "clicks".
	*/
	float delta_x;
	/**
	* The mouse wheel's vertical scroll amount. A scroll down (where the
	* content moves up) is represented as positive values, and a scroll up
	* (where the content moves down) is represented as negative values.
	*
	* The units are either in pixels (when scroll_by_page is false) or pages
	* (when scroll_by_page is true). For example, delta_y = -3 means scroll up 3
	* pixels when scroll_by_page is false, and scroll up 3 pages when
	* scroll_by_page is true.
	*
	* This amount is system dependent and will take into account the user's
	* preferred scroll sensitivity and potentially also nonlinear acceleration
	* based on the speed of the scrolling.
	*
	* Devices will be of varying resolution. Some mice with large detents will
	* only generate integer scroll amounts. But fractional values are also
	* possible, for example, on some trackpads and newer mice that don't have
	* "clicks".
	*/
	float delta_y;
	/**
	* The number of "clicks" of the scroll wheel that have produced the
	* event. The value may have system-specific acceleration applied to it,
	* depending on the device. The positive and negative meanings are the same
	* as for <code>delta_x</code> and <code>delta_y</code>.
	*
	* If you are scrolling, you probably want to use the delta values above.
	* These tick events can be useful if you aren't doing actual scrolling and
	* don't want or pixel values. An example may be cycling between different
	* items in a game.
	*
	* You may receive fractional values for the wheel ticks if the mouse wheel
	* is high resolution or doesn't have "clicks". If your program wants
	* discrete events (as in the "picking items" example) you should accumulate
	* fractional click values from multiple messages until the total value
	* reaches positive or negative one. This should represent a similar amount
	* of scrolling as for a mouse that has a discrete mouse wheel.
	*/
	float wheel_ticks_x;
	/** This value represents */
	float wheel_ticks_y;
	/**
	* Indicates if the scroll <code>delta_x</code>/<code>delta_y</code>
	* indicates pages or lines to scroll by. When true, the user is requesting
	* to scroll by pages.
	*/
	PP_Bool scroll_by_page;
	};
	PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_InputEvent_Wheel, 24);
	/**
	* @}
	*/

	#endif /* PPAPI_C_PP_INPUT_EVENT_H_ */