149 lines
4.1 KiB
C
149 lines
4.1 KiB
C
/*
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* xevents.c -- handling X events, and detecting single-click and double-click
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* mouse events.
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*
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* Copyright (C) 2009 Hugo Villeneuve <hugo@hugovil.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#if HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <signal.h>
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#include <time.h>
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#include <pthread.h>
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#include <sys/types.h>
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#include <X11/Xlib.h>
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#include "common.h"
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#include "dockapp.h"
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#include "xevents.h"
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/* Maximum time between mouse double-clicks, in milliseconds */
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#define DOUBLE_CLICK_MAX_INTERVAL_MS 250
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/* Function pointers to handle single and double mouse click events. */
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static void (*SingleClickCallback)( void ) = NULL;
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static void (*DoubleClickCallback)( void ) = NULL;
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void
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AudibleBeep( void )
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{
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/* The specified volume is relative to the base volume for the keyboard.
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To change the base volume of the keyboard, use XChangeKeyboardControl(). */
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(void) XBell( dockapp.display, 100 ); /* Volume = 100% */
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}
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/* This function must be called at the beginning of your program to initialize
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the function pointers to handle single and double click mouse events. */
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void
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ProcessXlibEventsInit( void (*single_click_callback)( void ),
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void (*double_click_callback)( void ) )
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{
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int status;
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/* This must be called before any other XLib functions. */
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status = XInitThreads();
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if( status == 0 ) {
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fprintf( stderr, "%s: XInitThreads() initialization failed\n", PACKAGE );
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ErrorLocation( __FILE__, __LINE__ );
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exit( EXIT_FAILURE );
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}
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SingleClickCallback = single_click_callback;
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DoubleClickCallback = double_click_callback;
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}
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/* Processing of X events */
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void
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ProcessXlibEvents( void )
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{
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bool quit = false;
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bool button1_pressed = false;
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bool check_for_double_click = false;
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XEvent Event;
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while( quit == false ) {
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if( ( check_for_double_click != false ) &&
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( XPending( dockapp.display ) == 0 ) ) {
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/* If no other button 1 events are received after the delay, then it is a
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single-click mouse event. */
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if( SingleClickCallback != NULL ) {
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(*SingleClickCallback)();
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}
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check_for_double_click = false;
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}
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/* XNextEvent is a blocking call: it will return only when an event is
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ready to be processed, thus freeing the CPU for other tasks when no
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events are available. */
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(void) XNextEvent( dockapp.display, &Event );
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switch( Event.type ) {
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case Expose:
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/* Window was uncovered... */
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RedrawWindow();
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break;
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case DestroyNotify:
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/* Window was killed... */
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/* Is this necessary ? */
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(void) XCloseDisplay( dockapp.display );
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quit = true;
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break;
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case ClientMessage:
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/* Doesn't seem to work... */
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printf( "Client message received...\n" );
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break;
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case ButtonPress:
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if( Event.xbutton.button == Button1 ) {
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/* Mouse LEFT button pressed. */
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button1_pressed = true;
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}
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break;
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case ButtonRelease:
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if( Event.xbutton.button == Button1 ) {
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/* Mouse LEFT button released. */
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if( button1_pressed != false ) {
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/* We act only when the button is released */
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if( check_for_double_click != false ) {
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/* Double-click */
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if( DoubleClickCallback != NULL ) {
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(*DoubleClickCallback)();
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}
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check_for_double_click = false;
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}
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else {
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(void) usleep( DOUBLE_CLICK_MAX_INTERVAL_MS * 1000 );
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check_for_double_click = true;
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}
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}
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}
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break;
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}
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} /* end while */
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}
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