gtkradiant/tools/urt/libs/gtkutil/cursor.h

#if !defined( INCLUDED_GTKUTIL_CURSOR_H )
#define INCLUDED_GTKUTIL_CURSOR_H

#include <glib/gmain.h>
#include <gdk/gdkevents.h>
#include <gtk/gtkwidget.h>

#include "debugging/debugging.h"

typedef struct _GdkCursor GdkCursor;
typedef struct _GtkWidget GtkWidget;

GdkCursor* create_blank_cursor();
void blank_cursor( GtkWidget* widget );
void default_cursor( GtkWidget* widget );
void Sys_GetCursorPos( int *x, int *y );
void Sys_SetCursorPos( int x, int y );



class DeferredMotion
{
guint m_handler;
typedef void ( *MotionFunction )( gdouble x, gdouble y, guint state, void* data );
MotionFunction m_function;
void* m_data;
gdouble m_x;
gdouble m_y;
guint m_state;

static gboolean deferred( DeferredMotion* self ){
	self->m_handler = 0;
	self->m_function( self->m_x, self->m_y, self->m_state, self->m_data );
	return FALSE;
}
public:
DeferredMotion( MotionFunction function, void* data ) : m_handler( 0 ), m_function( function ), m_data( data ){
}
void motion( gdouble x, gdouble y, guint state ){
	m_x = x;
	m_y = y;
	m_state = state;
	if ( m_handler == 0 ) {
		m_handler = g_idle_add( (GSourceFunc)deferred, this );
	}
}
static gboolean gtk_motion( GtkWidget *widget, GdkEventMotion *event, DeferredMotion* self ){
	self->motion( event->x, event->y, event->state );
	return FALSE;
}
};

class DeferredMotionDelta
{
int m_delta_x;
int m_delta_y;
guint m_motion_handler;
typedef void ( *MotionDeltaFunction )( int x, int y, void* data );
MotionDeltaFunction m_function;
void* m_data;

static gboolean deferred_motion( gpointer data ){
	reinterpret_cast<DeferredMotionDelta*>( data )->m_function(
		reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_x,
		reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_y,
		reinterpret_cast<DeferredMotionDelta*>( data )->m_data
		);
	reinterpret_cast<DeferredMotionDelta*>( data )->m_motion_handler = 0;
	reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_x = 0;
	reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_y = 0;
	return FALSE;
}
public:
DeferredMotionDelta( MotionDeltaFunction function, void* data ) : m_delta_x( 0 ), m_delta_y( 0 ), m_motion_handler( 0 ), m_function( function ), m_data( data ){
}
void flush(){
	if ( m_motion_handler != 0 ) {
		g_source_remove( m_motion_handler );
		deferred_motion( this );
	}
}
void motion_delta( int x, int y, unsigned int state ){
	m_delta_x += x;
	m_delta_y += y;
	if ( m_motion_handler == 0 ) {
		m_motion_handler = g_idle_add( deferred_motion, this );
	}
}
};

class FreezePointer
{
unsigned int handle_motion;
int recorded_x, recorded_y;
typedef void ( *MotionDeltaFunction )( int x, int y, unsigned int state, void* data );
MotionDeltaFunction m_function;
void* m_data;
public:
FreezePointer() : handle_motion( 0 ), m_function( 0 ), m_data( 0 ){
}
static gboolean motion_delta( GtkWidget *widget, GdkEventMotion *event, FreezePointer* self ){
	int current_x, current_y;
	Sys_GetCursorPos( &current_x, &current_y );
	int dx = current_x - self->recorded_x;
	int dy = current_y - self->recorded_y;
	if ( dx != 0 || dy != 0 ) {
		//globalOutputStream() << "motion x: " << dx << ", y: " << dy << "\n";
		Sys_SetCursorPos( self->recorded_x, self->recorded_y );
		self->m_function( dx, dy, event->state, self->m_data );
	}
	return FALSE;
}

void freeze_pointer( GtkWidget* window, MotionDeltaFunction function, void* data ){
	ASSERT_MESSAGE( m_function == 0, "can't freeze pointer" );

	blank_cursor( window );

	const GdkEventMask mask = static_cast<GdkEventMask>( GDK_POINTER_MOTION_MASK
														 | GDK_POINTER_MOTION_HINT_MASK
														 | GDK_BUTTON_MOTION_MASK
														 | GDK_BUTTON1_MOTION_MASK
														 | GDK_BUTTON2_MOTION_MASK
														 | GDK_BUTTON3_MOTION_MASK
														 | GDK_BUTTON_PRESS_MASK
														 | GDK_BUTTON_RELEASE_MASK
														 | GDK_VISIBILITY_NOTIFY_MASK );

	//GdkGrabStatus status =
	gdk_pointer_grab( window->window, TRUE, mask, window->window, 0, GDK_CURRENT_TIME );

	Sys_GetCursorPos( &recorded_x, &recorded_y );

	Sys_SetCursorPos( recorded_x, recorded_y );

	m_function = function;
	m_data = data;

	handle_motion = g_signal_connect( G_OBJECT( window ), "motion_notify_event", G_CALLBACK( motion_delta ), this );
}

void unfreeze_pointer( GtkWidget* window ){
	g_signal_handler_disconnect( G_OBJECT( window ), handle_motion );

	m_function = 0;
	m_data = 0;

	Sys_SetCursorPos( recorded_x, recorded_y );

	gdk_pointer_ungrab( GDK_CURRENT_TIME );

	default_cursor( window );
}
};

#endif