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mutter/clutter/clutter-event.h
Emmanuele Bassi d6d208da7d Remove Units from the public API 
With the recent change to internal floating point values, ClutterUnit
has become a redundant type, defined to be a float. All integer entry
points are being internally converted to floating point values to be
passed to the GL pipeline with the least amount of conversion.

ClutterUnit is thus exposed as just a "pixel with fractionary bits",
and not -- as users might think -- as generic, resolution and device
independent units. not that it was the case, but a definitive amount
of people was convinced it did provide this "feature", and was flummoxed
about the mere existence of this type.

So, having ClutterUnit exposed in the public API doubles the entry
points and has the following disadvantages:

  - we have to maintain twice the amount of entry points in ClutterActor
  - we still do an integer-to-float implicit conversion
  - we introduce a weird impedance between pixels and "pixels with
    fractionary bits"
  - language bindings will have to choose what to bind, and resort
    to manually overriding the API
    + *except* for language bindings based on GObject-Introspection, as
      they cannot do manual overrides, thus will replicate the entire
      set of entry points

For these reason, we should coalesces every Actor entry point for
pixels and for ClutterUnit into a single entry point taking a float,
like:

  void clutter_actor_set_x (ClutterActor *self,
                            gfloat        x);
  void clutter_actor_get_size (ClutterActor *self,
                               gfloat       *width,
                               gfloat       *height);
  gfloat clutter_actor_get_height (ClutterActor *self);

etc.

The issues I have identified are:

  - we'll have a two cases of compiler warnings:
    - printf() format of the return values from %d to %f
    - clutter_actor_get_size() taking floats instead of unsigned ints
  - we'll have a problem with varargs when passing an integer instead
    of a floating point value, except on 64bit platforms where the
    size of a float is the same as the size of an int

To be clear: the *intent* of the API should not change -- we still use
pixels everywhere -- but:

  - we remove ambiguity in the API with regard to pixels and units
  - we remove entry points we get to maintain for the whole 1.0
    version of the API
  - we make things simpler to bind for both manual language bindings
    and automatic (gobject-introspection based) ones
  - we have the simplest API possible while still exposing the
    capabilities of the underlying GL implementation
2009-05-06 16:44:47 +01:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
#error "Only <clutter/clutter.h> can be included directly."
#endif
#ifndef __CLUTTER_EVENT_H__
#define __CLUTTER_EVENT_H__
#include <glib-object.h>
#include <clutter/clutter-types.h>
#define CLUTTER_TYPE_EVENT (clutter_event_get_type ())
/**
* CLUTTER_PRIORITY_EVENTS:
*
* Priority for event handling.
*
* Since: 0.4
*/
#define CLUTTER_PRIORITY_EVENTS (G_PRIORITY_DEFAULT)
/**
* CLUTTER_CURRENT_TIME:
*
* Default value for "now".
*
* Since: 0.4
*/
#define CLUTTER_CURRENT_TIME 0L
G_BEGIN_DECLS
/**
* ClutterModifierType:
* @CLUTTER_SHIFT_MASK: Mask applied by the Shift key
* @CLUTTER_LOCK_MASK: Mask applied by the Caps Lock key
* @CLUTTER_CONTROL_MASK: Mask applied by the Control key
* @CLUTTER_MOD1_MASK: Mask applied by the first Mod key
* @CLUTTER_MOD2_MASK: Mask applied by the second Mod key
* @CLUTTER_MOD3_MASK: Mask applied by the third Mod key
* @CLUTTER_MOD4_MASK: Mask applied by the fourth Mod key
* @CLUTTER_MOD5_MASK: Mask applied by the fifth Mod key
* @CLUTTER_BUTTON1_MASK: Mask applied by the first pointer button
* @CLUTTER_BUTTON2_MASK: Mask applied by the second pointer button
* @CLUTTER_BUTTON3_MASK: Mask applied by the third pointer button
* @CLUTTER_BUTTON4_MASK: Mask applied by the fourth pointer button
* @CLUTTER_BUTTON5_MASK: Mask applied by the fifth pointer button
* @CLUTTER_SUPER_MASK: Mask applied by the Super key
* @CLUTTER_HYPER_MASK: Mask applied by the Hyper key
* @CLUTTER_META_MASK: Mask applied by the Meta key
* @CLUTTER_RELEASE_MASK: Mask applied during release
* @CLUTTER_MODIFIER_MASK: A mask covering all modifier types
*
* Masks applied to a #ClutterEvent by modifiers.
*
* Since: 0.4
*/
typedef enum {
CLUTTER_SHIFT_MASK = 1 << 0,
CLUTTER_LOCK_MASK = 1 << 1,
CLUTTER_CONTROL_MASK = 1 << 2,
CLUTTER_MOD1_MASK = 1 << 3,
CLUTTER_MOD2_MASK = 1 << 4,
CLUTTER_MOD3_MASK = 1 << 5,
CLUTTER_MOD4_MASK = 1 << 6,
CLUTTER_MOD5_MASK = 1 << 7,
CLUTTER_BUTTON1_MASK = 1 << 8,
CLUTTER_BUTTON2_MASK = 1 << 9,
CLUTTER_BUTTON3_MASK = 1 << 10,
CLUTTER_BUTTON4_MASK = 1 << 11,
CLUTTER_BUTTON5_MASK = 1 << 12,
/* bits 15 to 25 are currently unused; bit 29 is used internally */
CLUTTER_SUPER_MASK = 1 << 26,
CLUTTER_HYPER_MASK = 1 << 27,
CLUTTER_META_MASK = 1 << 28,
CLUTTER_RELEASE_MASK = 1 << 30,
CLUTTER_MODIFIER_MASK = 0x5c001fff
} ClutterModifierType;
/**
* ClutterEventFlags:
* @CLUTTER_EVENT_FLAG_SYNTHETIC: Synthetic event
*
* Flags for the #ClutterEvent
*
* Since: 0.6
*/
typedef enum {
CLUTTER_EVENT_FLAG_SYNTHETIC = 1 << 0,
} ClutterEventFlags;
/**
* ClutterEventType:
* @CLUTTER_NOTHING: Empty event
* @CLUTTER_KEY_PRESS: Key press event
* @CLUTTER_KEY_RELEASE: Key release event
* @CLUTTER_MOTION: Pointer motion event
* @CLUTTER_ENTER: Actor enter event
* @CLUTTER_LEAVE: Actor leave event
* @CLUTTER_BUTTON_PRESS: Pointer button press event
* @CLUTTER_BUTTON_RELEASE: Pointer button release event
* @CLUTTER_SCROLL: Pointer scroll event
* @CLUTTER_STAGE_STATE: Stage stage change event
* @CLUTTER_DESTROY_NOTIFY: Destroy notification event
* @CLUTTER_CLIENT_MESSAGE: Client message event
* @CLUTTER_DELETE: Stage delete event
*
* Types of events.
*
* Since: 0.4
*/
typedef enum
{
CLUTTER_NOTHING = 0,
CLUTTER_KEY_PRESS,
CLUTTER_KEY_RELEASE,
CLUTTER_MOTION,
CLUTTER_ENTER,
CLUTTER_LEAVE,
CLUTTER_BUTTON_PRESS,
CLUTTER_BUTTON_RELEASE,
CLUTTER_SCROLL,
CLUTTER_STAGE_STATE,
CLUTTER_DESTROY_NOTIFY,
CLUTTER_CLIENT_MESSAGE,
CLUTTER_DELETE
} ClutterEventType;
/**
* ClutterScrollDirection:
* @CLUTTER_SCROLL_UP: Scroll up
* @CLUTTER_SCROLL_DOWN: Scroll down
* @CLUTTER_SCROLL_LEFT: Scroll left
* @CLUTTER_SCROLL_RIGHT: Scroll right
*
* Direction of a pointer scroll event.
*
* Since: 0.4
*/
typedef enum
{
CLUTTER_SCROLL_UP,
CLUTTER_SCROLL_DOWN,
CLUTTER_SCROLL_LEFT,
CLUTTER_SCROLL_RIGHT
} ClutterScrollDirection;
/**
* ClutterStageState:
* @CLUTTER_STAGE_STATE_FULLSCREEN: Fullscreen mask
* @CLUTTER_STAGE_STATE_OFFSCREEN: Offscreen mask
* @CLUTTER_STAGE_STATE_ACTIVATED: Activated mask
*
* Stage state masks
*
* Since: 0.4
*/
typedef enum
{
CLUTTER_STAGE_STATE_FULLSCREEN = (1<<1),
CLUTTER_STAGE_STATE_OFFSCREEN = (1<<2),
CLUTTER_STAGE_STATE_ACTIVATED = (1<<3)
} ClutterStageState;
typedef union _ClutterEvent ClutterEvent;
typedef struct _ClutterAnyEvent ClutterAnyEvent;
typedef struct _ClutterButtonEvent ClutterButtonEvent;
typedef struct _ClutterKeyEvent ClutterKeyEvent;
typedef struct _ClutterMotionEvent ClutterMotionEvent;
typedef struct _ClutterScrollEvent ClutterScrollEvent;
typedef struct _ClutterStageStateEvent ClutterStageStateEvent;
typedef struct _ClutterCrossingEvent ClutterCrossingEvent;
/**
* ClutterInputDevice:
*
* Generic representation of an input device. The
* actual contents of this structure depend on the
* backend used.
*/
typedef struct _ClutterInputDevice ClutterInputDevice;
/**
* ClutterAnyEvent:
* @type: event type
* @time: event time
* @flags: event flags
* @source: event source actor
*
* Common members for a #ClutterEvent
*
* Since: 0.2
*/
struct _ClutterAnyEvent
{
ClutterEventType type;
guint32 time;
ClutterEventFlags flags;
ClutterStage *stage;
ClutterActor *source;
};
/**
* ClutterKeyEvent:
* @type: event type
* @time: event time
* @flags: event flags
* @stage: event source stage
* @source: event source actor
* @modifier_state: key modifiers
* @keyval: raw key value
* @hardware_keycode: raw hardware key value
* @unicode_value: Unicode representation
* @device: reserved for future use
*
* Key event
*
* Since: 0.2
*/
struct _ClutterKeyEvent
{
ClutterEventType type;
guint32 time;
ClutterEventFlags flags;
ClutterStage *stage;
ClutterActor *source;
ClutterModifierType modifier_state;
guint keyval;
guint16 hardware_keycode;
gunichar unicode_value;
ClutterInputDevice *device;
};
/**
* ClutterButtonEvent:
* @type: event type
* @time: event time
* @flags: event flags
* @stage: event source stage
* @source: event source actor
* @x: event X coordinate, relative to the stage
* @y: event Y coordinate, relative to the stage
* @modifier_state: button modifiers
* @button: event button
* @click_count: number of button presses within the default time
* and radius
* @axes: reserved for future use
* @device: reserved for future use
*
* Button event.
*
* The event coordinates are relative to the stage that received the
* event, and can be transformed into actor-relative coordinates by
* using clutter_actor_transform_stage_point().
*
* Since: 0.2
*/
struct _ClutterButtonEvent
{
ClutterEventType type;
guint32 time;
ClutterEventFlags flags;
ClutterStage *stage;
ClutterActor *source;
gfloat x;
gfloat y;
ClutterModifierType modifier_state;
guint32 button;
guint click_count;
gdouble *axes; /* Future use */
ClutterInputDevice *device; /* Future use */
};
/**
* ClutterCrossingEvent:
* @type: event type
* @time: event time
* @flags: event flags
* @stage: event source stage
* @source: event source actor
* @x: event X coordinate
* @y: event Y coordinate
* @related: actor related to the crossing
* @device: reserved for future use
*
* Event for the movement of the pointer across different actors
*
* Since: 0.2
*/
struct _ClutterCrossingEvent
{
ClutterEventType type;
guint32 time;
ClutterEventFlags flags;
ClutterStage *stage;
ClutterActor *source;
gfloat x;
gfloat y;
ClutterInputDevice *device; /* future use */
ClutterActor *related;
};
/**
* ClutterMotionEvent:
* @type: event type
* @time: event time
* @flags: event flags
* @stage: event source stage
* @source: event source actor
* @x: event X coordinate
* @y: event Y coordinate
* @modifier_state: button modifiers
* @axes: reserved for future use
* @device: reserved for future use
*
* Event for the pointer motion
*
* Since: 0.2
*/
struct _ClutterMotionEvent
{
ClutterEventType type;
guint32 time;
ClutterEventFlags flags;
ClutterStage *stage;
ClutterActor *source;
gfloat x;
gfloat y;
ClutterModifierType modifier_state;
gdouble *axes; /* Future use */
ClutterInputDevice *device; /* Future use */
};
/**
* ClutterScrollEvent:
* @type: event type
* @time: event time
* @flags: event flags
* @stage: event source stage
* @source: event source actor
* @x: event X coordinate
* @y: event Y coordinate
* @direction: direction of the scrolling
* @modifier_state: button modifiers
* @axes: reserved for future use
* @device: reserved for future use
*
* Scroll wheel (or similar device) event
*
* Since: 0.2
*/
struct _ClutterScrollEvent
{
ClutterEventType type;
guint32 time;
ClutterEventFlags flags;
ClutterStage *stage;
ClutterActor *source;
gfloat x;
gfloat y;
ClutterScrollDirection direction;
ClutterModifierType modifier_state;
gdouble *axes; /* future use */
ClutterInputDevice *device; /* future use */
};
/**
* ClutterStageStateEvent:
* @type: event type
* @time: event time
* @flags: event flags
* @stage: event source stage
* @source: event source actor (unused)
* @changed_mask: bitwise OR of the changed flags
* @new_state: bitwise OR of the current state flags
*
* Event signalling a change in the #ClutterStage state.
*
* Since: 0.2
*/
struct _ClutterStageStateEvent
{
ClutterEventType type;
guint32 time;
ClutterEventFlags flags;
ClutterStage *stage;
ClutterActor *source; /* unused XXX: should probably be the stage itself */
ClutterStageState changed_mask;
ClutterStageState new_state;
};
/**
* ClutterEvent:
* @type: event type
*
* Generic event wrapper.
*
* Since: 0.2
*/
union _ClutterEvent
{
ClutterEventType type;
ClutterAnyEvent any;
ClutterButtonEvent button;
ClutterKeyEvent key;
ClutterMotionEvent motion;
ClutterScrollEvent scroll;
ClutterStageStateEvent stage_state;
ClutterCrossingEvent crossing;
};
GType clutter_event_get_type (void) G_GNUC_CONST;
gboolean clutter_events_pending (void);
ClutterEvent * clutter_event_get (void);
ClutterEvent * clutter_event_peek (void);
void clutter_event_put (ClutterEvent *event);
ClutterEvent * clutter_event_new (ClutterEventType type);
ClutterEvent * clutter_event_copy (ClutterEvent *event);
void clutter_event_free (ClutterEvent *event);
ClutterEventType clutter_event_type (ClutterEvent *event);
guint32 clutter_event_get_time (ClutterEvent *event);
ClutterModifierType clutter_event_get_state (ClutterEvent *event);
void clutter_event_get_coords (ClutterEvent *event,
gfloat *x,
gfloat *y);
gint clutter_event_get_device_id (ClutterEvent *event);
ClutterActor* clutter_event_get_source (ClutterEvent *event);
guint clutter_key_event_symbol (ClutterKeyEvent *keyev);
guint16 clutter_key_event_code (ClutterKeyEvent *keyev);
guint32 clutter_key_event_unicode (ClutterKeyEvent *keyev);
guint32 clutter_button_event_button (ClutterButtonEvent *buttev);
guint32 clutter_keysym_to_unicode (guint keyval);
ClutterStage* clutter_event_get_stage (ClutterEvent *event);
guint32 clutter_get_current_event_time (void);
G_END_DECLS
#endif /* __CLUTTER_EVENT_H__ */
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