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 <gdk/gdkevents.h>
  27 #include <gtk/gtkwidget.h>
  28 #include <gtk/gtkwindow.h>
  29
  30 #include "debugging/debugging.h"
  31
  32 typedef struct _GdkCursor GdkCursor;
  33 typedef struct _GtkWidget GtkWidget;
  34 typedef struct _GtkWindow GtkWindow;
  35
  36 GdkCursor* create_blank_cursor();
  37 void blank_cursor( GtkWidget* widget );
  38 void default_cursor( GtkWidget* widget );
  39 void Sys_GetCursorPos( GtkWindow* window, int *x, int *y );
  40 void Sys_SetCursorPos( GtkWindow* window, int x, int y );
  41
  42
  43
  44 class DeferredMotion
  45 {
  46 guint m_handler;
  47 typedef void ( *MotionFunction )( gdouble x, gdouble y, guint state, void* data );
  48 MotionFunction m_function;
  49 void* m_data;
  50 gdouble m_x;
  51 gdouble m_y;
  52 guint m_state;
  53
  54 static gboolean deferred( DeferredMotion* self ){
  55         self->m_handler = 0;
  56         self->m_function( self->m_x, self->m_y, self->m_state, self->m_data );
  57         return FALSE;
  58 }
  59 public:
  60 DeferredMotion( MotionFunction function, void* data ) : m_handler( 0 ), m_function( function ), m_data( data ){
  61 }
  62 void motion( gdouble x, gdouble y, guint state ){
  63         m_x = x;
  64         m_y = y;
  65         m_state = state;
  66         if ( m_handler == 0 ) {
  67                 m_handler = g_idle_add( (GSourceFunc)deferred, this );
  68         }
  69 }
  70 static gboolean gtk_motion( GtkWidget *widget, GdkEventMotion *event, DeferredMotion* self ){
  71         self->motion( event->x, event->y, event->state );
  72         return FALSE;
  73 }
  74 };
  75
  76 class DeferredMotionDelta
  77 {
  78 int m_delta_x;
  79 int m_delta_y;
  80 guint m_motion_handler;
  81 typedef void ( *MotionDeltaFunction )( int x, int y, void* data );
  82 MotionDeltaFunction m_function;
  83 void* m_data;
  84
  85 static gboolean deferred_motion( gpointer data ){
  86         reinterpret_cast<DeferredMotionDelta*>( data )->m_function(
  87                 reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_x,
  88                 reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_y,
  89                 reinterpret_cast<DeferredMotionDelta*>( data )->m_data
  90                 );
  91         reinterpret_cast<DeferredMotionDelta*>( data )->m_motion_handler = 0;
  92         reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_x = 0;
  93         reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_y = 0;
  94         return FALSE;
  95 }
  96 public:
  97 DeferredMotionDelta( MotionDeltaFunction function, void* data ) : m_delta_x( 0 ), m_delta_y( 0 ), m_motion_handler( 0 ), m_function( function ), m_data( data ){
  98 }
  99 void flush(){
 100         if ( m_motion_handler != 0 ) {
 101                 g_source_remove( m_motion_handler );
 102                 deferred_motion( this );
 103         }
 104 }
 105 void motion_delta( int x, int y, unsigned int state ){
 106         m_delta_x += x;
 107         m_delta_y += y;
 108         if ( m_motion_handler == 0 ) {
 109                 m_motion_handler = g_idle_add( deferred_motion, this );
 110         }
 111 }
 112 };
 113
 114 class FreezePointer
 115 {
 116 unsigned int handle_motion;
 117 int recorded_x, recorded_y;
 118 typedef void ( *MotionDeltaFunction )( int x, int y, unsigned int state, void* data );
 119 MotionDeltaFunction m_function;
 120 void* m_data;
 121 public:
 122 FreezePointer() : handle_motion( 0 ), m_function( 0 ), m_data( 0 ){
 123 }
 124 static gboolean motion_delta( GtkWidget *widget, GdkEventMotion *event, FreezePointer* self ){
 125         int current_x, current_y;
 126         Sys_GetCursorPos( GTK_WINDOW( widget ), &current_x, &current_y );
 127         int dx = current_x - self->recorded_x;
 128         int dy = current_y - self->recorded_y;
 129         if ( dx != 0 || dy != 0 ) {
 130                 //globalOutputStream() << "motion x: " << dx << ", y: " << dy << "\n";
 131                 Sys_SetCursorPos( GTK_WINDOW( widget ), self->recorded_x, self->recorded_y );
 132                 self->m_function( dx, dy, event->state, self->m_data );
 133         }
 134         return FALSE;
 135 }
 136
 137 void freeze_pointer( GtkWindow* window, MotionDeltaFunction function, void* data ){
 138         ASSERT_MESSAGE( m_function == 0, "can't freeze pointer" );
 139
 140         const GdkEventMask mask = static_cast<GdkEventMask>( GDK_POINTER_MOTION_MASK
 141                                                                                                                  | GDK_POINTER_MOTION_HINT_MASK
 142                                                                                                                  | GDK_BUTTON_MOTION_MASK
 143                                                                                                                  | GDK_BUTTON1_MOTION_MASK
 144                                                                                                                  | GDK_BUTTON2_MOTION_MASK
 145                                                                                                                  | GDK_BUTTON3_MOTION_MASK
 146                                                                                                                  | GDK_BUTTON_PRESS_MASK
 147                                                                                                                  | GDK_BUTTON_RELEASE_MASK
 148                                                                                                                  | GDK_VISIBILITY_NOTIFY_MASK );
 149
 150         GdkCursor* cursor = create_blank_cursor();
 151         //GdkGrabStatus status =
 152         gdk_pointer_grab( GTK_WIDGET( window )->window, TRUE, mask, 0, cursor, GDK_CURRENT_TIME );
 153         gdk_cursor_unref( cursor );
 154
 155         Sys_GetCursorPos( window, &recorded_x, &recorded_y );
 156
 157         Sys_SetCursorPos( window, recorded_x, recorded_y );
 158
 159         m_function = function;
 160         m_data = data;
 161
 162         handle_motion = g_signal_connect( G_OBJECT( window ), "motion_notify_event", G_CALLBACK( motion_delta ), this );
 163 }
 164
 165 void unfreeze_pointer( GtkWindow* window ){
 166         g_signal_handler_disconnect( G_OBJECT( window ), handle_motion );
 167
 168         m_function = 0;
 169         m_data = 0;
 170
 171         Sys_SetCursorPos( window, recorded_x, recorded_y );
 172
 173         gdk_pointer_ungrab( GDK_CURRENT_TIME );
 174 }
 175 };
 176
 177 #endif