libs/gtkutil/cursor.h

   1 /*
   2    Copyright (C) 2001-2006, William Joseph.
   3    All Rights Reserved.
   4
   5    This file is part of GtkRadiant.
   6
   7    GtkRadiant is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    GtkRadiant is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GtkRadiant; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  20  */
  21
  22 #if !defined( INCLUDED_GTKUTIL_CURSOR_H )
  23 #define INCLUDED_GTKUTIL_CURSOR_H
  24
  25 #include <glib.h>
  26 #include <gtk/gtk.h>
  27 #include <uilib/uilib.h>
  28
  29 #include "debugging/debugging.h"
  30
  31 typedef struct _GdkCursor GdkCursor;
  32
  33 GdkCursor* create_blank_cursor();
  34 void blank_cursor( ui::Widget widget );
  35 void default_cursor( ui::Widget widget );
  36 void Sys_GetCursorPos( ui::Window window, int *x, int *y );
  37 void Sys_SetCursorPos( ui::Window window, int x, int y );
  38
  39
  40
  41 class DeferredMotion
  42 {
  43 guint m_handler;
  44 typedef void ( *MotionFunction )( gdouble x, gdouble y, guint state, void* data );
  45 MotionFunction m_function;
  46 void* m_data;
  47 gdouble m_x;
  48 gdouble m_y;
  49 guint m_state;
  50
  51 static gboolean deferred( DeferredMotion* self ){
  52         self->m_handler = 0;
  53         self->m_function( self->m_x, self->m_y, self->m_state, self->m_data );
  54         return FALSE;
  55 }
  56 public:
  57 DeferredMotion( MotionFunction function, void* data ) : m_handler( 0 ), m_function( function ), m_data( data ){
  58 }
  59 void motion( gdouble x, gdouble y, guint state ){
  60         m_x = x;
  61         m_y = y;
  62         m_state = state;
  63         if ( m_handler == 0 ) {
  64                 m_handler = g_idle_add( (GSourceFunc)deferred, this );
  65         }
  66 }
  67 static gboolean gtk_motion( ui::Widget widget, GdkEventMotion *event, DeferredMotion* self ){
  68         self->motion( event->x, event->y, event->state );
  69         return FALSE;
  70 }
  71 };
  72
  73 class DeferredMotionDelta
  74 {
  75 int m_delta_x;
  76 int m_delta_y;
  77 guint m_motion_handler;
  78 typedef void ( *MotionDeltaFunction )( int x, int y, void* data );
  79 MotionDeltaFunction m_function;
  80 void* m_data;
  81
  82 static gboolean deferred_motion( gpointer data ){
  83         reinterpret_cast<DeferredMotionDelta*>( data )->m_function(
  84                 reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_x,
  85                 reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_y,
  86                 reinterpret_cast<DeferredMotionDelta*>( data )->m_data
  87                 );
  88         reinterpret_cast<DeferredMotionDelta*>( data )->m_motion_handler = 0;
  89         reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_x = 0;
  90         reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_y = 0;
  91         return FALSE;
  92 }
  93 public:
  94 DeferredMotionDelta( MotionDeltaFunction function, void* data ) : m_delta_x( 0 ), m_delta_y( 0 ), m_motion_handler( 0 ), m_function( function ), m_data( data ){
  95 }
  96 void flush(){
  97         if ( m_motion_handler != 0 ) {
  98                 g_source_remove( m_motion_handler );
  99                 deferred_motion( this );
 100         }
 101 }
 102 void motion_delta( int x, int y, unsigned int state ){
 103         m_delta_x += x;
 104         m_delta_y += y;
 105         if ( m_motion_handler == 0 ) {
 106                 m_motion_handler = g_idle_add( deferred_motion, this );
 107         }
 108 }
 109 };
 110
 111 class FreezePointer
 112 {
 113 unsigned int handle_motion;
 114 int recorded_x, recorded_y, last_x, last_y;
 115 typedef void ( *MotionDeltaFunction )( int x, int y, unsigned int state, void* data );
 116 MotionDeltaFunction m_function;
 117 void* m_data;
 118 public:
 119 FreezePointer() : handle_motion( 0 ), m_function( 0 ), m_data( 0 ){
 120 }
 121 static gboolean motion_delta( ui::Widget widget, GdkEventMotion *event, FreezePointer* self ){
 122         int current_x, current_y;
 123         Sys_GetCursorPos( ui::Window(GTK_WINDOW( widget )), &current_x, &current_y );
 124         int dx = current_x - self->last_x;
 125         int dy = current_y - self->last_y;
 126         int ddx = current_x - self->recorded_x;
 127         int ddy = current_y - self->recorded_y;
 128         self->last_x = current_x;
 129         self->last_y = current_y;
 130         if ( dx != 0 || dy != 0 ) {
 131                 //globalOutputStream() << "motion x: " << dx << ", y: " << dy << "\n";
 132                 if (ddx < -32 || ddx > 32 || ddy < -32 || ddy > 32) {
 133                         Sys_SetCursorPos( ui::Window(GTK_WINDOW( widget )), self->recorded_x, self->recorded_y );
 134                         self->last_x = self->recorded_x;
 135                         self->last_y = self->recorded_y;
 136                 }
 137                 self->m_function( dx, dy, event->state, self->m_data );
 138         }
 139         return FALSE;
 140 }
 141
 142 void freeze_pointer( ui::Window window, MotionDeltaFunction function, void* data ){
 143         ASSERT_MESSAGE( m_function == 0, "can't freeze pointer" );
 144
 145         const GdkEventMask mask = static_cast<GdkEventMask>( GDK_POINTER_MOTION_MASK
 146                                                                                                                  | GDK_POINTER_MOTION_HINT_MASK
 147                                                                                                                  | GDK_BUTTON_MOTION_MASK
 148                                                                                                                  | GDK_BUTTON1_MOTION_MASK
 149                                                                                                                  | GDK_BUTTON2_MOTION_MASK
 150                                                                                                                  | GDK_BUTTON3_MOTION_MASK
 151                                                                                                                  | GDK_BUTTON_PRESS_MASK
 152                                                                                                                  | GDK_BUTTON_RELEASE_MASK
 153                                                                                                                  | GDK_VISIBILITY_NOTIFY_MASK );
 154
 155         GdkCursor* cursor = create_blank_cursor();
 156         //GdkGrabStatus status =
 157         gdk_pointer_grab( gtk_widget_get_window(GTK_WIDGET(window)), TRUE, mask, 0, cursor, GDK_CURRENT_TIME );
 158         gdk_cursor_unref( cursor );
 159
 160         Sys_GetCursorPos( window, &recorded_x, &recorded_y );
 161
 162         Sys_SetCursorPos( window, recorded_x, recorded_y );
 163
 164         last_x = recorded_x;
 165         last_y = recorded_y;
 166
 167         m_function = function;
 168         m_data = data;
 169
 170         handle_motion = g_signal_connect( G_OBJECT( window ), "motion_notify_event", G_CALLBACK( motion_delta ), this );
 171 }
 172
 173 void unfreeze_pointer( ui::Window window ){
 174         g_signal_handler_disconnect( G_OBJECT( window ), handle_motion );
 175
 176         m_function = 0;
 177         m_data = 0;
 178
 179         Sys_SetCursorPos( window, recorded_x, recorded_y );
 180
 181         gdk_pointer_ungrab( GDK_CURRENT_TIME );
 182 }
 183 };
 184
 185 #endif