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
  28 #include "debugging/debugging.h"
  29
  30 typedef struct _GdkCursor GdkCursor;
  31 typedef struct _GtkWidget GtkWidget;
  32 typedef struct _GtkWindow GtkWindow;
  33
  34 GdkCursor* create_blank_cursor();
  35 void blank_cursor( GtkWidget* widget );
  36 void default_cursor( GtkWidget* widget );
  37 void Sys_GetCursorPos( GtkWindow* window, int *x, int *y );
  38 void Sys_SetCursorPos( GtkWindow* window, int x, int y );
  39
  40
  41
  42 class DeferredMotion
  43 {
  44 guint m_handler;
  45 typedef void ( *MotionFunction )( gdouble x, gdouble y, guint state, void* data );
  46 MotionFunction m_function;
  47 void* m_data;
  48 gdouble m_x;
  49 gdouble m_y;
  50 guint m_state;
  51
  52 static gboolean deferred( DeferredMotion* self ){
  53         self->m_handler = 0;
  54         self->m_function( self->m_x, self->m_y, self->m_state, self->m_data );
  55         return FALSE;
  56 }
  57 public:
  58 DeferredMotion( MotionFunction function, void* data ) : m_handler( 0 ), m_function( function ), m_data( data ){
  59 }
  60 void motion( gdouble x, gdouble y, guint state ){
  61         m_x = x;
  62         m_y = y;
  63         m_state = state;
  64         if ( m_handler == 0 ) {
  65                 m_handler = g_idle_add( (GSourceFunc)deferred, this );
  66         }
  67 }
  68 static gboolean gtk_motion( GtkWidget *widget, GdkEventMotion *event, DeferredMotion* self ){
  69         self->motion( event->x, event->y, event->state );
  70         return FALSE;
  71 }
  72 };
  73
  74 class DeferredMotionDelta
  75 {
  76 int m_delta_x;
  77 int m_delta_y;
  78 guint m_motion_handler;
  79 typedef void ( *MotionDeltaFunction )( int x, int y, void* data );
  80 MotionDeltaFunction m_function;
  81 void* m_data;
  82
  83 static gboolean deferred_motion( gpointer data ){
  84         reinterpret_cast<DeferredMotionDelta*>( data )->m_function(
  85                 reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_x,
  86                 reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_y,
  87                 reinterpret_cast<DeferredMotionDelta*>( data )->m_data
  88                 );
  89         reinterpret_cast<DeferredMotionDelta*>( data )->m_motion_handler = 0;
  90         reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_x = 0;
  91         reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_y = 0;
  92         return FALSE;
  93 }
  94 public:
  95 DeferredMotionDelta( MotionDeltaFunction function, void* data ) : m_delta_x( 0 ), m_delta_y( 0 ), m_motion_handler( 0 ), m_function( function ), m_data( data ){
  96 }
  97 void flush(){
  98         if ( m_motion_handler != 0 ) {
  99                 g_source_remove( m_motion_handler );
 100                 deferred_motion( this );
 101         }
 102 }
 103 void motion_delta( int x, int y, unsigned int state ){
 104         m_delta_x += x;
 105         m_delta_y += y;
 106         if ( m_motion_handler == 0 ) {
 107                 m_motion_handler = g_idle_add( deferred_motion, this );
 108         }
 109 }
 110 };
 111
 112 class FreezePointer
 113 {
 114 unsigned int handle_motion;
 115 int recorded_x, recorded_y, last_x, last_y;
 116 typedef void ( *MotionDeltaFunction )( int x, int y, unsigned int state, void* data );
 117 MotionDeltaFunction m_function;
 118 void* m_data;
 119 public:
 120 FreezePointer() : handle_motion( 0 ), m_function( 0 ), m_data( 0 ){
 121 }
 122 static gboolean motion_delta( GtkWidget *widget, GdkEventMotion *event, FreezePointer* self ){
 123         int current_x, current_y;
 124         Sys_GetCursorPos( GTK_WINDOW( widget ), &current_x, &current_y );
 125         int dx = current_x - self->last_x;
 126         int dy = current_y - self->last_y;
 127         int ddx = current_x - self->recorded_x;
 128         int ddy = current_y - self->recorded_y;
 129         self->last_x = current_x;
 130         self->last_y = current_y;
 131         if ( dx != 0 || dy != 0 ) {
 132                 //globalOutputStream() << "motion x: " << dx << ", y: " << dy << "\n";
 133                 if (ddx < -32 || ddx > 32 || ddy < -32 || ddy > 32) {
 134                         Sys_SetCursorPos( GTK_WINDOW( widget ), self->recorded_x, self->recorded_y );
 135                         self->last_x = self->recorded_x;
 136                         self->last_y = self->recorded_y;
 137                 }
 138                 self->m_function( dx, dy, event->state, self->m_data );
 139         }
 140         return FALSE;
 141 }
 142
 143 void freeze_pointer( GtkWindow* window, MotionDeltaFunction function, void* data ){
 144         ASSERT_MESSAGE( m_function == 0, "can't freeze pointer" );
 145
 146         const GdkEventMask mask = static_cast<GdkEventMask>( GDK_POINTER_MOTION_MASK
 147                                                                                                                  | GDK_POINTER_MOTION_HINT_MASK
 148                                                                                                                  | GDK_BUTTON_MOTION_MASK
 149                                                                                                                  | GDK_BUTTON1_MOTION_MASK
 150                                                                                                                  | GDK_BUTTON2_MOTION_MASK
 151                                                                                                                  | GDK_BUTTON3_MOTION_MASK
 152                                                                                                                  | GDK_BUTTON_PRESS_MASK
 153                                                                                                                  | GDK_BUTTON_RELEASE_MASK
 154                                                                                                                  | GDK_VISIBILITY_NOTIFY_MASK );
 155
 156         GdkCursor* cursor = create_blank_cursor();
 157         //GdkGrabStatus status =
 158         gdk_pointer_grab( gtk_widget_get_window(GTK_WIDGET(window)), TRUE, mask, 0, cursor, GDK_CURRENT_TIME );
 159         gdk_cursor_unref( cursor );
 160
 161         Sys_GetCursorPos( window, &recorded_x, &recorded_y );
 162
 163         Sys_SetCursorPos( window, recorded_x, recorded_y );
 164
 165         last_x = recorded_x;
 166         last_y = recorded_y;
 167
 168         m_function = function;
 169         m_data = data;
 170
 171         handle_motion = g_signal_connect( G_OBJECT( window ), "motion_notify_event", G_CALLBACK( motion_delta ), this );
 172 }
 173
 174 void unfreeze_pointer( GtkWindow* window ){
 175         g_signal_handler_disconnect( G_OBJECT( window ), handle_motion );
 176
 177         m_function = 0;
 178         m_data = 0;
 179
 180         Sys_SetCursorPos( window, recorded_x, recorded_y );
 181
 182         gdk_pointer_ungrab( GDK_CURRENT_TIME );
 183 }
 184 };
 185
 186 #endif