** $Id: workarea.cpp,v 1.3 2005/01/16 19:55:57 darco Exp $
**
** \legal
-** Copyright (c) 2002 Robert B. Quattlebaum Jr.
+** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+** Copyright 2006 Yue Shi Lai
**
-** This software and associated documentation
-** are CONFIDENTIAL and PROPRIETARY property of
-** the above-mentioned copyright holder.
+** This package 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.
**
-** You may not copy, print, publish, or in any
-** other way distribute this software without
-** a prior written agreement with
-** the copyright holder.
+** This package 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.
** \endlegal
*/
/* ========================================================================= */
/* === C L A S S E S ======================================================= */
-class WorkAreaTarget : public synfig::Target_Tile
+class studio::WorkAreaTarget : public synfig::Target_Tile
{
public:
WorkArea *workarea;
};
-class WorkAreaTarget_Full : public synfig::Target_Scanline
+class studio::WorkAreaTarget_Full : public synfig::Target_Scanline
{
public:
WorkArea *workarea;
canvas(canvas_interface->get_canvas()),
scrollx_adjustment(0,-4,4,0.01,0.1),
scrolly_adjustment(0,-4,4,0.01,0.1),
+ w(128),
+ h(128),
+ last_event_time(0),
progresscallback(0),
dragging(DRAG_NONE),
show_grid(false),
// button_pressed=0;
}
}
+ // GDK mouse scrolling events
+ else if(event->any.type==GDK_SCROLL)
+ {
+ // GDK information needed to properly interprete mouse
+ // scrolling events are: scroll.state, scroll.x/scroll.y, and
+ // scroll.direction. The value of scroll.direction will be
+ // obtained later.
+ modifier=Gdk::ModifierType(event->scroll.state);
+ mouse_pos=synfig::Point(screen_to_comp_coords(synfig::Point(event->scroll.x,event->scroll.y)));
+ }
// Handle the renderables
{
return ret;
}
break;
+ case GDK_SCROLL:
+ {
+ // Handle a mouse scrolling event like Xara Xtreme and
+ // Inkscape:
+
+ // Scroll up/down: scroll up/down
+ // Shift + scroll up/down: scroll left/right
+ // Control + scroll up/down: zoom in/out
+
+ if(modifier&GDK_CONTROL_MASK)
+ {
+
+ // The zoom is performed while preserving the pointer
+ // position as a fixed point (similarly to Xara Xtreme and
+ // Inkscape).
+
+ // The strategy used below is to scroll to the updated
+ // position, then zoom. This is easy to implement within
+ // the present architecture, but has the disadvantage of
+ // triggering multiple visible refreshes. Note: 1.25 is
+ // the hard wired ratio in zoom_in()/zoom_out(). The
+ // variable "drift" compensates additional inaccuracies in
+ // the zoom. There is also an additional minus sign for
+ // the inverted y coordinates.
+
+ // FIXME: One might want to figure out where in the code
+ // this empirical drift is been introduced.
+
+ const synfig::Point scroll_point(get_scrollx_adjustment()->get_value(),get_scrolly_adjustment()->get_value());
+ const double drift = 0.052;
+
+ switch(event->scroll.direction)
+ {
+ case GDK_SCROLL_UP:
+ get_scrollx_adjustment()->set_value(scroll_point[0]+(mouse_pos[0]-scroll_point[0])*(1.25-(1+drift)));
+ get_scrolly_adjustment()->set_value(scroll_point[1]-(mouse_pos[1]+scroll_point[1])*(1.25-(1+drift)));
+ zoom_in();
+ break;
+ case GDK_SCROLL_DOWN:
+ get_scrollx_adjustment()->set_value(scroll_point[0]+(mouse_pos[0]-scroll_point[0])*(1/1.25-(1+drift)));
+ get_scrolly_adjustment()->set_value(scroll_point[1]-(mouse_pos[1]+scroll_point[1])*(1/1.25-(1+drift)));
+ zoom_out();
+ break;
+ default:
+ break;
+ }
+ }
+ else if(modifier&GDK_SHIFT_MASK)
+ {
+ // Scroll in either direction by 20 pixels. Ideally, the
+ // amount of pixels per scrolling event should be
+ // configurable. Xara Xtreme currently uses an (hard
+ // wired) amount 20 pixel, Inkscape defaults to 40 pixels.
+
+ const int scroll_pixel = 20;
+
+ switch(event->scroll.direction)
+ {
+ case GDK_SCROLL_UP:
+ get_scrollx_adjustment()->set_value(get_scrollx_adjustment()->get_value()-scroll_pixel*pw);
+ break;
+ case GDK_SCROLL_DOWN:
+ get_scrollx_adjustment()->set_value(get_scrollx_adjustment()->get_value()+scroll_pixel*pw);
+ break;
+ default:
+ break;
+ }
+ }
+ else
+ {
+ // Scroll in either direction by 20 pixels. Ideally, the
+ // amount of pixels per scrolling event should be
+ // configurable. Xara Xtreme currently uses an (hard
+ // wired) amount 20 pixel, Inkscape defaults to 40 pixels.
+
+ const int scroll_pixel = 20;
+
+ switch(event->scroll.direction)
+ {
+ case GDK_SCROLL_UP:
+ get_scrolly_adjustment()->set_value(get_scrolly_adjustment()->get_value()+scroll_pixel*ph);
+ break;
+ case GDK_SCROLL_DOWN:
+ get_scrolly_adjustment()->set_value(get_scrolly_adjustment()->get_value()-scroll_pixel*ph);
+ break;
+ default:
+ break;
+ }
+ }
+ }
+ break;
default:
break;
}
projects / synfig.git / blobdiff