app/create_object.c

   1 /* Dia -- an diagram creation/manipulation program
   2  * Copyright (C) 1998 Alexander Larsson
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  */
  18 #include "create_object.h"
  19 #include "connectionpoint_ops.h"
  20 #include "handle_ops.h"
  21 #include "object_ops.h"
  22 #include "preferences.h"
  23 #include "undo.h"
  24
  25 static void create_object_button_press(CreateObjectTool *tool, GdkEventButton *event,
  26                                      DDisplay *ddisp);
  27 static void create_object_button_release(CreateObjectTool *tool, GdkEventButton *event,
  28                                        DDisplay *ddisp);
  29 static void create_object_motion(CreateObjectTool *tool, GdkEventMotion *event,
  30                                  DDisplay *ddisp);
  31 static void create_object_double_click(CreateObjectTool *tool, GdkEventMotion *event,
  32                                        DDisplay *ddisp);
  33
  34
  35 static void
  36 create_object_button_press(CreateObjectTool *tool, GdkEventButton *event,
  37                            DDisplay *ddisp)
  38 {
  39   Point clickedpoint, origpoint;
  40   Handle *handle1;
  41   Handle *handle2;
  42   Object *obj;
  43
  44   ddisplay_untransform_coords(ddisp,
  45                               (int)event->x, (int)event->y,
  46                               &clickedpoint.x, &clickedpoint.y);
  47
  48   origpoint = clickedpoint;
  49
  50   snap_to_grid(ddisp, &clickedpoint.x, &clickedpoint.y);
  51
  52   obj = tool->objtype->ops->create(&clickedpoint, tool->user_data,
  53                                    &handle1, &handle2);
  54   diagram_add_object(ddisp->diagram, obj);
  55
  56   /* Try a connect */
  57   if (handle1 != NULL &&
  58       handle1->connect_type != HANDLE_NONCONNECTABLE) {
  59     ConnectionPoint *connectionpoint;
  60     connectionpoint =
  61       object_find_connectpoint_display(ddisp, &origpoint);
  62     if (connectionpoint != NULL) {
  63       (obj->ops->move)(obj, &origpoint);
  64     }
  65   }
  66
  67   if (!(event->state & GDK_SHIFT_MASK)) {
  68     /* Not Multi-select => remove current selection */
  69     diagram_remove_all_selected(ddisp->diagram, TRUE);
  70   }
  71   diagram_select(ddisp->diagram, obj);
  72
  73   obj->ops->selectf(obj, &clickedpoint,
  74                    (Renderer *)ddisp->renderer);
  75
  76   tool->obj = obj;
  77
  78   /* Connect first handle if possible: */
  79   if ((handle1!= NULL) &&
  80       (handle1->connect_type != HANDLE_NONCONNECTABLE)) {
  81     object_connect_display(ddisp, obj, handle1);
  82   }
  83
  84   object_add_updates(obj, ddisp->diagram);
  85   diagram_flush(ddisp->diagram);
  86
  87   if (handle2 != NULL) {
  88     tool->handle = handle2;
  89     tool->moving = TRUE;
  90     tool->last_to = handle2->pos;
  91
  92     gdk_pointer_grab (ddisp->canvas->window, FALSE,
  93                       GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON1_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
  94                       NULL, NULL, event->time);
  95   } else {
  96     diagram_update_extents(ddisp->diagram);
  97     tool->moving = FALSE;
  98   }
  99 }
 100
 101 static void
 102 create_object_double_click(CreateObjectTool *tool, GdkEventMotion *event,
 103                            DDisplay *ddisp)
 104 {
 105 }
 106
 107 static void
 108 create_object_button_release(CreateObjectTool *tool, GdkEventButton *event,
 109                              DDisplay *ddisp)
 110 {
 111   GList *list = NULL;
 112   if (tool->moving) {
 113     gdk_pointer_ungrab (event->time);
 114
 115     object_add_updates(tool->obj, ddisp->diagram);
 116     tool->obj->ops->move_handle(tool->obj, tool->handle, &tool->last_to,
 117                                 HANDLE_MOVE_CREATE_FINAL,0);
 118     object_add_updates(tool->obj, ddisp->diagram);
 119
 120   }
 121
 122   list = g_list_prepend(list, tool->obj);
 123
 124   undo_insert_objects(ddisp->diagram, list, 1);
 125
 126   if (tool->moving) {
 127     if (tool->handle->connect_type != HANDLE_NONCONNECTABLE) {
 128       object_connect_display(ddisp, tool->obj, tool->handle);
 129       diagram_update_connections_selection(ddisp->diagram);
 130       diagram_flush(ddisp->diagram);
 131     }
 132     tool->moving = FALSE;
 133     tool->handle = NULL;
 134     tool->obj = NULL;
 135   }
 136
 137   diagram_update_extents(ddisp->diagram);
 138   diagram_modified(ddisp->diagram);
 139
 140   undo_set_transactionpoint(ddisp->diagram->undo);
 141
 142   if (prefs.reset_tools_after_create)
 143       tool_reset();
 144 }
 145 static void
 146 create_object_motion(CreateObjectTool *tool, GdkEventMotion *event,
 147                    DDisplay *ddisp)
 148 {
 149   Point to;
 150   ConnectionPoint *connectionpoint;
 151
 152   if (!tool->moving)
 153     return;
 154
 155   ddisplay_untransform_coords(ddisp, event->x, event->y, &to.x, &to.y);
 156
 157   /* Move to ConnectionPoint if near: */
 158   if ((tool->handle != NULL &&
 159        tool->handle->connect_type != HANDLE_NONCONNECTABLE) &&
 160       ((connectionpoint =
 161         object_find_connectpoint_display(ddisp, &to)) != NULL)) {
 162     to = connectionpoint->pos;
 163   } else {
 164     /* No connectionopoint near, then snap to grid (if enabled) */
 165     snap_to_grid(ddisp, &to.x, &to.y);
 166   }
 167
 168   object_add_updates(tool->obj, ddisp->diagram);
 169   tool->obj->ops->move_handle(tool->obj, tool->handle, &to,
 170                               HANDLE_MOVE_CREATE, 0);
 171   object_add_updates(tool->obj, ddisp->diagram);
 172
 173   diagram_flush(ddisp->diagram);
 174
 175   tool->last_to = to;
 176
 177   return;
 178 }
 179
 180
 181
 182 Tool *create_create_object_tool(ObjectType *objtype, void *user_data)
 183 {
 184   CreateObjectTool *tool;
 185
 186   tool = g_new(CreateObjectTool, 1);
 187   tool->tool.type = CREATE_OBJECT_TOOL;
 188   tool->tool.button_press_func = (ButtonPressFunc) &create_object_button_press;
 189   tool->tool.button_release_func = (ButtonReleaseFunc) &create_object_button_release;
 190   tool->tool.motion_func = (MotionFunc) &create_object_motion;
 191   tool->tool.double_click_func = (DoubleClickFunc) &create_object_double_click;
 192
 193   tool->objtype = objtype;
 194   tool->user_data = user_data;
 195   tool->moving = FALSE;
 196
 197   return (Tool *) tool;
 198 }
 199
 200 void free_create_object_tool(Tool *tool)
 201 {
 202   g_free(tool);
 203 }