gimp/app/tools/gimpmovetool.c

/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "config.h"

#include <stdlib.h>

#include <gtk/gtk.h>

#include "libgimpwidgets/gimpwidgets.h"

#include "tools-types.h"

#include "core/gimpimage.h"
#include "core/gimpimage-mask.h"
#include "core/gimplayer.h"

#include "display/gimpdisplay.h"
#include "display/gimpdisplay-foreach.h"
#include "display/gimpdisplayshell.h"

#include "gimpeditselectiontool.h"
#include "gimpmovetool.h"
#include "tool_manager.h"
#include "tool_options.h"

#include "colormaps.h"
#include "floating_sel.h"
#include "undo.h"

#include "libgimp/gimpintl.h"


static void   gimp_move_tool_class_init (GimpMoveToolClass *klass);
static void   gimp_move_tool_init       (GimpMoveTool      *move_tool);

static void   move_tool_control	        (GimpTool          *tool,
					 ToolAction         tool_action,
					 GimpDisplay       *gdisp);
static void   move_tool_button_press    (GimpTool          *tool,
                                         GimpCoords        *coords,
                                         guint32            time,
					 GdkModifierType    state,
					 GimpDisplay       *gdisp);
static void   move_tool_button_release  (GimpTool          *tool,
                                         GimpCoords        *coords,
                                         guint32            time,
					 GdkModifierType    state,
					 GimpDisplay       *gdisp);
static void   move_tool_motion          (GimpTool          *tool,
                                         GimpCoords        *coords,
                                         guint32            time,
					 GdkModifierType    state,
					 GimpDisplay       *gdisp);
static void   move_tool_cursor_update   (GimpTool          *tool,
                                         GimpCoords        *coords,
					 GdkModifierType    state,
					 GimpDisplay       *gdisp);

static void   move_create_gc            (GimpDisplay       *gdisp);
static void   move_draw_guide           (GimpDisplay       *gdisp, 
                                         GimpGuide         *guide);


/*  the move tool options  */
static GimpToolOptions *move_options = NULL;

/*  local variables  */
static GdkGC *move_gc = NULL;

static GimpToolClass *parent_class = NULL;


void
gimp_move_tool_register (Gimp *gimp)
{
  tool_manager_register_tool (gimp,
			      GIMP_TYPE_MOVE_TOOL,
                              FALSE,
			      "gimp:move_tool",
			      _("Move Tool"),
			      _("Move layers & selections"),
			      N_("/Tools/Transform Tools/Move"), "M",
			      NULL, "tools/move.html",
			      GIMP_STOCK_TOOL_MOVE);
}

GType
gimp_move_tool_get_type (void)
{
  static GType tool_type = 0;

  if (! tool_type)
    {
      static const GTypeInfo tool_info =
      {
        sizeof (GimpMoveToolClass),
	(GBaseInitFunc) NULL,
	(GBaseFinalizeFunc) NULL,
	(GClassInitFunc) gimp_move_tool_class_init,
	NULL,           /* class_finalize */
	NULL,           /* class_data     */
	sizeof (GimpMoveTool),
	0,              /* n_preallocs    */
	(GInstanceInitFunc) gimp_move_tool_init,
      };

      tool_type = g_type_register_static (GIMP_TYPE_TOOL,
					  "GimpMoveTool", 
                                          &tool_info, 0);
    }

  return tool_type;
}

static void
gimp_move_tool_class_init (GimpMoveToolClass *klass)
{
  GimpToolClass *tool_class;

  tool_class = GIMP_TOOL_CLASS (klass);

  parent_class = g_type_class_peek_parent (klass);

  tool_class->control        = move_tool_control;
  tool_class->button_press   = move_tool_button_press;
  tool_class->button_release = move_tool_button_release;
  tool_class->motion         = move_tool_motion;
  tool_class->arrow_key      = gimp_edit_selection_tool_arrow_key;
  tool_class->cursor_update  = move_tool_cursor_update;
}

static void
gimp_move_tool_init (GimpMoveTool *move_tool)
{
  GimpTool *tool;

  tool = GIMP_TOOL (move_tool);

  /*  The tool options  */
  if (! move_options)
    {
      move_options = tool_options_new ();

      tool_manager_register_tool_options (GIMP_TYPE_MOVE_TOOL,
					  (GimpToolOptions *) move_options);
    }

  move_tool->layer = NULL;
  move_tool->guide = NULL;
  move_tool->disp  = NULL;

  tool->tool_cursor  = GIMP_MOVE_TOOL_CURSOR;

  tool->auto_snap_to = FALSE;  /*  Don't snap to guides  */
}

static void
move_tool_control (GimpTool    *tool,
		   ToolAction   action,
		   GimpDisplay *gdisp)
{
  GimpMoveTool *move_tool;

  move_tool = GIMP_MOVE_TOOL (tool);

  switch (action)
    {
    case PAUSE:
      break;

    case RESUME:
      if (move_tool->guide)
	gimp_display_shell_draw_guide (GIMP_DISPLAY_SHELL (gdisp->shell),
                                       move_tool->guide, TRUE);
      break;

    case HALT:
      if (move_tool->guide)
        gimp_display_shell_draw_guide (GIMP_DISPLAY_SHELL (gdisp->shell),
                                       move_tool->guide, FALSE);
      break;

    default:
      break;
    }

  if (GIMP_TOOL_CLASS (parent_class)->control)
    GIMP_TOOL_CLASS (parent_class)->control (tool, action, gdisp);
}

static void
move_tool_button_press (GimpTool        *tool,
                        GimpCoords      *coords,
                        guint32          time,
			GdkModifierType  state,
			GimpDisplay     *gdisp)
{
  GimpMoveTool     *move;
  GimpDisplayShell *shell;
  GimpLayer        *layer;
  GimpGuide        *guide;

  move = GIMP_MOVE_TOOL (tool);

  shell = GIMP_DISPLAY_SHELL (gdisp->shell);

  tool->gdisp = gdisp;
  move->layer = NULL;
  move->guide = NULL;
  move->disp  = NULL;

  if ((state & GDK_MOD1_MASK) && ! gimage_mask_is_empty (gdisp->gimage))
    {
      init_edit_selection (tool, gdisp, coords, EDIT_MASK_TRANSLATE);
      tool->state = ACTIVE;
    }
  else if (state & GDK_SHIFT_MASK)
    {
      init_edit_selection (tool, gdisp, coords, EDIT_LAYER_TRANSLATE);
      tool->state = ACTIVE;
    }
  else
    {
      if (gdisp->draw_guides &&
	  (guide = gimp_image_find_guide (gdisp->gimage, coords->x, coords->y)))
	{
	  undo_push_guide (gdisp->gimage, guide);

	  gdisplays_expose_guide (gdisp->gimage, guide);
	  gimp_image_remove_guide (gdisp->gimage, guide);
	  gdisplay_flush (gdisp);
	  gimp_image_add_guide (gdisp->gimage, guide);

	  move->guide = guide;
	  move->disp  = gdisp;

	  tool->scroll_lock = TRUE;
	  tool->state       = ACTIVE;

	  move_draw_guide (gdisp, move->guide);
	}
      else if ((layer = gimp_image_pick_correlate_layer (gdisp->gimage,
                                                         coords->x,
                                                         coords->y)))
	{
	  /*  If there is a floating selection, and this aint it,
	   *  use the move tool
	   */
	  if (gimp_image_floating_sel (gdisp->gimage) &&
	      ! gimp_layer_is_floating_sel (layer))
	    {
	      move->layer = gimp_image_floating_sel (gdisp->gimage);
	    }
	  /*  Otherwise, init the edit selection  */
	  else
	    {
	      gimp_image_set_active_layer (gdisp->gimage, layer);
	      init_edit_selection (tool, gdisp, coords, EDIT_LAYER_TRANSLATE);
	    }
	  tool->state = ACTIVE;
	}
    }

  /* if we've got an active tool grab the pointer */
  if (tool->state == ACTIVE)      
    {
      gdk_pointer_grab (shell->canvas->window, FALSE,
			GDK_POINTER_MOTION_HINT_MASK |
			GDK_BUTTON1_MOTION_MASK |
			GDK_BUTTON_RELEASE_MASK,
			NULL, NULL, time);
    }
}

static void
move_tool_button_release (GimpTool        *tool,
                          GimpCoords      *coords,
                          guint32          time,
			  GdkModifierType  state,
			  GimpDisplay     *gdisp)
{
  GimpMoveTool *move;
  gboolean      delete_guide;
  gint          x1, y1;
  gint          x2, y2;

  move = GIMP_MOVE_TOOL (tool);

  tool->state = INACTIVE;

  gdk_pointer_ungrab (time);
  gdk_flush ();

  if (move->guide)
    {
      GimpDisplayShell *shell;

      shell = GIMP_DISPLAY_SHELL (tool->gdisp->shell);

      tool->scroll_lock = FALSE;

      delete_guide = FALSE;
      gdisplay_untransform_coords (gdisp,
                                   0, 0,
                                   &x1, &y1,
                                   FALSE, FALSE);
      gdisplay_untransform_coords (gdisp,
                                   shell->disp_width, shell->disp_height,
				   &x2, &y2,
                                   FALSE, FALSE);

      if (x1 < 0) x1 = 0;
      if (y1 < 0) y1 = 0;
      if (x2 > gdisp->gimage->width)  x2 = gdisp->gimage->width;
      if (y2 > gdisp->gimage->height) y2 = gdisp->gimage->height;

      switch (move->guide->orientation)
	{
	case ORIENTATION_HORIZONTAL:
	  if ((move->guide->position < y1) || (move->guide->position > y2))
	    delete_guide = TRUE;
	  break;

	case ORIENTATION_VERTICAL:
	  if ((move->guide->position < x1) || (move->guide->position > x2))
	    delete_guide = TRUE;
	  break;

	default:
	  break;
	}

      gdisplays_expose_guide (gdisp->gimage, move->guide);

      move_draw_guide (gdisp, move->guide);

      if (delete_guide)
	{
	  gimp_image_delete_guide (gdisp->gimage, move->guide);
	  move->guide = NULL;
	  move->disp  = NULL;
	}

      gdisplay_selection_visibility (gdisp, GIMP_SELECTION_RESUME);
      gdisplays_flush ();

      if (move->guide)
	gimp_display_shell_draw_guide (shell, move->guide, TRUE);
    }
  else
    {
      /*  Take care of the case where the user "cancels" the action  */
      if (! (state & GDK_BUTTON3_MASK))
	{
	  if (move->layer)
	    {
	      floating_sel_anchor (move->layer);
	      gdisplays_flush ();
	    }
	}
    }
}

static void
move_tool_motion (GimpTool        *tool,
                  GimpCoords      *coords,
                  guint32          time,
		  GdkModifierType  state,
		  GimpDisplay     *gdisp)

{
  GimpMoveTool *move;

  move = GIMP_MOVE_TOOL (tool);

  if (move->guide)
    {
      GimpDisplayShell *shell;
      gint              tx, ty;

      shell = GIMP_DISPLAY_SHELL (gdisp->shell);

      move_draw_guide (gdisp, move->guide);

      gdisplay_transform_coords (gdisp,
                                 coords->x, coords->y,
                                 &tx, &ty,
                                 FALSE);

      if (tx < 0 ||
          ty < 0 ||
          tx >= shell->disp_width ||
          ty >= shell->disp_height)
	{
	  move->guide->position = -1;
	}
      else
        {
          if (move->guide->orientation == ORIENTATION_HORIZONTAL)
            move->guide->position = ROUND (coords->y);
          else
            move->guide->position = ROUND (coords->x);

          move_draw_guide (gdisp, move->guide);
        }
    }
}

static void
move_tool_cursor_update (GimpTool        *tool,
                         GimpCoords      *coords,
			 GdkModifierType  state,
			 GimpDisplay     *gdisp)
{
  GimpMoveTool     *move;
  GimpDisplayShell *shell;
  GimpGuide        *guide;
  GimpLayer        *layer;

  move = GIMP_MOVE_TOOL (tool);

  shell = GIMP_DISPLAY_SHELL (gdisp->shell);

  if ((state & GDK_MOD1_MASK) && ! gimage_mask_is_empty (gdisp->gimage))
    {
      gimp_display_shell_install_tool_cursor (shell,
                                              GIMP_MOUSE_CURSOR,
                                              GIMP_RECT_SELECT_TOOL_CURSOR,
                                              GIMP_CURSOR_MODIFIER_MOVE);
    }
  else if (state & GDK_SHIFT_MASK)
    {
      gimp_display_shell_install_tool_cursor (shell,
                                              GIMP_MOUSE_CURSOR,
                                              GIMP_MOVE_TOOL_CURSOR,
                                              GIMP_CURSOR_MODIFIER_NONE);
    }
  else
    {
      if (gdisp->draw_guides &&
	  (guide = gimp_image_find_guide (gdisp->gimage, coords->x, coords->y)))
	{
	  tool->gdisp = gdisp;

	  gimp_display_shell_install_tool_cursor (shell,
                                                  GDK_HAND2,
                                                  GIMP_TOOL_CURSOR_NONE,
                                                  GIMP_CURSOR_MODIFIER_HAND);

	  if (tool->state != ACTIVE)
	    {
	      if (move->guide)
		{
		  gdisp = gdisplays_check_valid (move->disp, move->disp->gimage);

		  if (gdisp)
                    {
                      shell = GIMP_DISPLAY_SHELL (gdisp->shell);

                      gimp_display_shell_draw_guide (shell, move->guide, FALSE);
                    }
		}

	      gimp_display_shell_draw_guide (shell, guide, TRUE);

	      move->guide = guide;
	      move->disp  = gdisp;
	    }
	}
      else if ((layer = gimp_image_pick_correlate_layer (gdisp->gimage,
                                                         coords->x, coords->y)))
	{
	  /*  if there is a floating selection, and this aint it...  */
	  if (gimp_image_floating_sel (gdisp->gimage) &&
	      ! gimp_layer_is_floating_sel (layer))
	    {
	      gimp_display_shell_install_tool_cursor (shell,
                                                      GIMP_MOUSE_CURSOR,
                                                      GIMP_RECT_SELECT_TOOL_CURSOR,
                                                      GIMP_CURSOR_MODIFIER_ANCHOR);
	    }
	  else if (layer == gimp_image_get_active_layer (gdisp->gimage))
	    {
	      gimp_display_shell_install_tool_cursor (shell,
                                                      GIMP_MOUSE_CURSOR,
                                                      GIMP_MOVE_TOOL_CURSOR,
                                                      GIMP_CURSOR_MODIFIER_NONE);
	    }
	  else
	    {
	      gimp_display_shell_install_tool_cursor (shell,
                                                      GDK_HAND2,
                                                      GIMP_TOOL_CURSOR_NONE,
                                                      GIMP_CURSOR_MODIFIER_HAND);
	    }
	}
      else
	{
	  gimp_display_shell_install_tool_cursor (shell,
                                                  GIMP_BAD_CURSOR,
                                                  GIMP_MOVE_TOOL_CURSOR,
                                                  GIMP_CURSOR_MODIFIER_NONE);
	}
    }
}

static void
move_create_gc (GimpDisplay *gdisp)
{
  if (! move_gc)
    {
      GimpDisplayShell *shell;
      GdkGCValues       values;

      shell = GIMP_DISPLAY_SHELL (gdisp->shell);

      values.foreground.pixel = g_white_pixel;
      values.function         = GDK_INVERT;
      move_gc = gdk_gc_new_with_values (shell->canvas->window, &values,
					GDK_GC_FUNCTION);
    }
}

static void
move_draw_guide (GimpDisplay *gdisp, 
		 GimpGuide   *guide)
{
  GimpDisplayShell *shell;
  gint              x1, y1;
  gint              x2, y2;
  gint              w, h;
  gint              x, y;

  shell = GIMP_DISPLAY_SHELL (gdisp->shell);

  if (!move_gc)
    move_create_gc (gdisp);

  if (guide->position == -1)
    return;
  
  gdisplay_transform_coords (gdisp, gdisp->gimage->width, 
			     gdisp->gimage->height, &x2, &y2, FALSE); 

  w = shell->canvas->allocation.width;
  h = shell->canvas->allocation.height;

  switch (guide->orientation)
    {
    case ORIENTATION_HORIZONTAL:
      gdisplay_transform_coords (gdisp, 0, guide->position, &x1, &y, FALSE);
      if (x1 < 0) x1 = 0;
      if (x2 > w) x2 = w;

      gdk_draw_line (shell->canvas->window, move_gc, x1, y, x2, y); 
      break;

    case ORIENTATION_VERTICAL:
      gdisplay_transform_coords (gdisp, guide->position, 0, &x, &y1, FALSE);
      if (y1 < 0) y1 = 0;
      if (y2 > h) y2 = h;

      gdk_draw_line (shell->canvas->window, move_gc, x, y1, x, y2);
      break;

    default:
      g_warning ("mdg / BAD FALLTHROUGH");
      break;
    }
}

void
gimp_move_tool_start_hguide (GimpTool    *tool,
			     GimpDisplay *gdisp)
{
  GimpMoveTool *move;

  move = GIMP_MOVE_TOOL (tool);

  gdisplay_selection_visibility (gdisp, GIMP_SELECTION_PAUSE);

  tool->gdisp       = gdisp;
  tool->scroll_lock = TRUE;

  if (move->guide && move->disp && move->disp->gimage)
    gimp_display_shell_draw_guide (GIMP_DISPLAY_SHELL (move->disp->shell),
                                   move->guide, FALSE);

  move->guide = gimp_image_add_hguide (gdisp->gimage);
  move->disp  = gdisp;

  tool->state = ACTIVE;

  undo_push_guide (gdisp->gimage, move->guide);
}

void
gimp_move_tool_start_vguide (GimpTool    *tool,
			     GimpDisplay *gdisp)
{
  GimpMoveTool *move;

  move = GIMP_MOVE_TOOL (tool);

  gdisplay_selection_visibility (gdisp, GIMP_SELECTION_PAUSE);

  tool->gdisp       = gdisp;
  tool->scroll_lock = TRUE;

  if (move->guide && move->disp && move->disp->gimage)
    gimp_display_shell_draw_guide (GIMP_DISPLAY_SHELL (move->disp->shell),
                                   move->guide, FALSE);

  move->guide = gimp_image_add_vguide (gdisp->gimage);
  move->disp  = gdisp;

  tool->state = ACTIVE;

  undo_push_guide (gdisp->gimage, move->guide);
}