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 #include <gtk/gtkmain.h>
  30
  31 #include "debugging/debugging.h"
  32
  33 typedef struct _GdkCursor GdkCursor;
  34 typedef struct _GtkWidget GtkWidget;
  35 typedef struct _GtkWindow GtkWindow;
  36
  37 #if 0
  38 GdkCursor* create_blank_cursor();
  39 void blank_cursor( GtkWidget* widget );
  40 void default_cursor( GtkWidget* widget );
  41 #endif
  42 void Sys_GetCursorPos( GtkWindow* window, int *x, int *y );
  43 void Sys_SetCursorPos( GtkWindow* window, int x, int y );
  44
  45
  46
  47 class DeferredMotion
  48 {
  49 guint m_handler;
  50 typedef void ( *MotionFunction )( gdouble x, gdouble y, guint state, void* data );
  51 MotionFunction m_function;
  52 void* m_data;
  53 gdouble m_x;
  54 gdouble m_y;
  55 guint m_state;
  56
  57 static gboolean deferred( DeferredMotion* self ){
  58         self->m_handler = 0;
  59         self->m_function( self->m_x, self->m_y, self->m_state, self->m_data );
  60         return FALSE;
  61 }
  62 public:
  63 DeferredMotion( MotionFunction function, void* data ) : m_handler( 0 ), m_function( function ), m_data( data ){
  64 }
  65 void motion( gdouble x, gdouble y, guint state ){
  66         m_x = x;
  67         m_y = y;
  68         m_state = state;
  69         if ( m_handler == 0 ) {
  70                 m_handler = g_idle_add( (GSourceFunc)deferred, this );
  71         }
  72 }
  73 static gboolean gtk_motion( GtkWidget *widget, GdkEventMotion *event, DeferredMotion* self ){
  74         self->motion( event->x, event->y, event->state );
  75         return FALSE;
  76 }
  77 };
  78
  79 class DeferredMotionDelta
  80 {
  81 int m_delta_x;
  82 int m_delta_y;
  83 guint m_motion_handler;
  84 typedef void ( *MotionDeltaFunction )( int x, int y, void* data );
  85 MotionDeltaFunction m_function;
  86 void* m_data;
  87
  88 static gboolean deferred_motion( gpointer data ){
  89         reinterpret_cast<DeferredMotionDelta*>( data )->m_function(
  90                 reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_x,
  91                 reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_y,
  92                 reinterpret_cast<DeferredMotionDelta*>( data )->m_data
  93                 );
  94         reinterpret_cast<DeferredMotionDelta*>( data )->m_motion_handler = 0;
  95         reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_x = 0;
  96         reinterpret_cast<DeferredMotionDelta*>( data )->m_delta_y = 0;
  97         return FALSE;
  98 }
  99 public:
 100 DeferredMotionDelta( MotionDeltaFunction function, void* data ) : m_delta_x( 0 ), m_delta_y( 0 ), m_motion_handler( 0 ), m_function( function ), m_data( data ){
 101 }
 102 void flush(){
 103         if ( m_motion_handler != 0 ) {
 104                 g_source_remove( m_motion_handler );
 105                 deferred_motion( this );
 106         }
 107 }
 108 void motion_delta( int x, int y, unsigned int state ){
 109         m_delta_x += x;
 110         m_delta_y += y;
 111         if ( m_motion_handler == 0 ) {
 112                 m_motion_handler = g_idle_add( deferred_motion, this );
 113         }
 114 }
 115 };
 116
 117 class FreezePointer
 118 {
 119 unsigned int handle_motion;
 120 int recorded_x, recorded_y, last_x, last_y, center_x, center_y;
 121 GtkWidget* m_weedjet;
 122 typedef void ( *MotionDeltaFunction )( int x, int y, unsigned int state, void* data );
 123 MotionDeltaFunction m_function;
 124 void* m_data;
 125 public:
 126 FreezePointer() : handle_motion( 0 ), m_function( 0 ), m_data( 0 ){
 127 }
 128 static gboolean motion_delta( GtkWidget *widget, GdkEventMotion *event, FreezePointer* self ){
 129         int current_x, current_y;
 130         Sys_GetCursorPos( GTK_WINDOW( widget ), &current_x, &current_y );
 131         int dx = current_x - self->last_x;
 132         int dy = current_y - self->last_y;
 133         int ddx = current_x - self->center_x;
 134         int ddy = current_y - self->center_y;
 135         self->last_x = current_x;
 136         self->last_y = current_y;
 137         if ( dx != 0 || dy != 0 ) {
 138                 //globalOutputStream() << "motion x: " << dx << ", y: " << dy << "\n";
 139                 if (ddx < -32 || ddx > 32 || ddy < -32 || ddy > 32) {
 140                         Sys_SetCursorPos( GTK_WINDOW( widget ), self->center_x, self->center_y );
 141                         self->last_x = self->center_x;
 142                         self->last_y = self->center_y;
 143                 }
 144                 self->m_function( dx, dy, event->state, self->m_data );
 145         }
 146         return FALSE;
 147 }
 148
 149 void freeze_pointer( GtkWindow* window, GtkWidget* widget, MotionDeltaFunction function, void* data ){
 150         ASSERT_MESSAGE( m_function == 0, "can't freeze pointer" );
 151
 152         const GdkEventMask mask = static_cast<GdkEventMask>( GDK_POINTER_MOTION_MASK
 153                                                                                                                  | GDK_POINTER_MOTION_HINT_MASK
 154                                                                                                                  | GDK_BUTTON_MOTION_MASK
 155                                                                                                                  | GDK_BUTTON1_MOTION_MASK
 156                                                                                                                  | GDK_BUTTON2_MOTION_MASK
 157                                                                                                                  | GDK_BUTTON3_MOTION_MASK
 158                                                                                                                  | GDK_BUTTON_PRESS_MASK
 159                                                                                                                  | GDK_BUTTON_RELEASE_MASK
 160                                                                                                                  | GDK_VISIBILITY_NOTIFY_MASK );
 161
 162         GdkCursor* cursor = gdk_cursor_new( GDK_BLANK_CURSOR );
 163         //GdkCursor* cursor = create_blank_cursor();
 164         //GdkGrabStatus status =
 165         /*      fixes cursor runaways during srsly quick drags in camera
 166         drags with pressed buttons have no problem at all w/o this      */
 167         gdk_pointer_grab( GTK_WIDGET( window )->window, TRUE, mask, 0, cursor, GDK_CURRENT_TIME );
 168         //gdk_window_set_cursor ( GTK_WIDGET( window )->window, cursor );
 169         /*      is needed to fix activating neighbour widgets, that happens, if using upper one */
 170         gtk_grab_add( widget );
 171         m_weedjet = widget;
 172
 173         gdk_cursor_unref( cursor );
 174
 175         Sys_GetCursorPos( window, &recorded_x, &recorded_y );
 176
 177         /*      using center for tracking for max safety        */
 178         gdk_window_get_origin( widget->window, &center_x, &center_y );
 179         center_y += widget->allocation.height / 2;
 180         center_x += widget->allocation.width / 2;
 181
 182         Sys_SetCursorPos( window, center_x, center_y );
 183
 184         last_x = center_x;
 185         last_y = center_y;
 186
 187         m_function = function;
 188         m_data = data;
 189
 190         handle_motion = g_signal_connect( G_OBJECT( window ), "motion_notify_event", G_CALLBACK( motion_delta ), this );
 191 }
 192
 193 void unfreeze_pointer( GtkWindow* window, bool centerize ){
 194         g_signal_handler_disconnect( G_OBJECT( window ), handle_motion );
 195
 196         m_function = 0;
 197         m_data = 0;
 198
 199         if( centerize ){
 200                 Sys_SetCursorPos( window, center_x, center_y );
 201         }
 202         else{
 203                 Sys_SetCursorPos( window, recorded_x, recorded_y );
 204         }
 205 //      gdk_window_set_cursor( GTK_WIDGET( window )->window, 0 );
 206         gdk_pointer_ungrab( GDK_CURRENT_TIME );
 207         if( m_weedjet )
 208                 gtk_grab_remove( m_weedjet );
 209 }
 210 };
 211
 212 #endif