1 /** \file
2 * Gtkmm facade/wrapper around zoom_status code that formerly lived
3 * in desktop-widget.cpp
4 *
5 * Authors:
6 * Ralf Stephan <ralf@ark.in-berlin.de>
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 * MenTaLguY <mental@rydia.net>
9 * bulia byak <buliabyak@users.sf.net>
10 *
11 * Copyright (C) 2005 Ralf Stephan
12 * Copyright (C) 2004 MenTaLguY
13 * Copyright (C) 1999-2002 Lauris Kaplinski
14 * Copyright (C) 2000-2001 Ximian, Inc.
15 *
16 * Released under GNU GPL, read the file 'COPYING' for more information
17 */
19 #include "ui/widget/zoom-status.h"
20 #include "desktop.h"
21 #include "desktop-handles.h"
22 #include "widgets/spw-utilities.h"
23 #include "libnr/nr-convert2geom.h"
25 namespace Inkscape {
26 namespace UI {
27 namespace Widget {
29 ZoomStatus::ZoomStatus()
30 : _adj(0.0, -1.0, 1.0, 0.1, 0.1)
31 {
32 _dt = 0;
33 _upd_f = false;
35 property_numeric() = false;
36 property_update_policy() = Gtk::UPDATE_ALWAYS;
37 sp_set_font_size_smaller(static_cast<GtkWidget*>((void*)gobj()));
38 }
40 ZoomStatus::~ZoomStatus()
41 {
42 _dt = 0;
43 }
45 void
46 ZoomStatus::init(SPDesktop *dt)
47 {
48 _dt = dt;
49 property_digits() = 4;
50 _adj.set_value(0.0);
51 _adj.set_lower(log(SP_DESKTOP_ZOOM_MIN)/log(2.0));
52 _adj.set_upper(log(SP_DESKTOP_ZOOM_MAX)/log(2.0));
53 _adj.set_step_increment(0.1);
54 _adj.set_page_increment(0.1);
55 set_adjustment(_adj);
56 }
58 void
59 ZoomStatus::update()
60 {
61 if (!_dt) return;
62 _upd_f = true;
63 set_value(log(_dt->current_zoom())/log(2.0));
64 _upd_f = false;
65 }
67 inline double
68 value_to_display(double value)
69 {
70 return floor(pow(2, value) * 100.0 + 0.5);
71 }
73 inline double
74 display_to_value(double value)
75 {
76 return log(value / 100.0) / log(2.0);
77 }
79 int
80 ZoomStatus::on_input(double *new_val)
81 {
82 double new_scrolled = get_value();
83 double new_typed = atof(get_text().c_str());
85 if (value_to_display(new_scrolled) == new_typed)
86 { // the new value is set by scrolling
87 *new_val = new_scrolled;
88 } else { // the new value is typed in
89 *new_val = display_to_value(new_typed);
90 }
92 return true;
93 }
95 bool
96 ZoomStatus::on_output()
97 {
98 gchar b[64];
99 g_snprintf(b, 64, "%4.0f%%", value_to_display(get_value()));
100 set_text(b);
101 return true;
102 }
104 void
105 ZoomStatus::on_value_changed()
106 {
107 if (_upd_f) return;
108 _upd_f = true;
109 g_assert(_dt);
110 double zoom_factor = pow(2, get_value());
111 Geom::Rect const d = _dt->get_display_area();
112 _dt->zoom_absolute(d.midpoint()[Geom::X], d.midpoint()[Geom::Y], zoom_factor);
113 gtk_widget_grab_focus(static_cast<GtkWidget*>((void*)_dt->canvas)); /// \todo this no love song
114 _upd_f = false;
115 }
117 }}}
119 /*
120 Local Variables:
121 mode:c++
122 c-file-style:"stroustrup"
123 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
124 indent-tabs-mode:nil
125 fill-column:99
126 End:
127 */
128 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :