1 /** @file
2 * Selector component (click and rubberband)
3 */
4 /* Authors:
5 * Krzysztof KosiĆski <tweenk.pl@gmail.com>
6 *
7 * Copyright (C) 2009 Authors
8 * Released under GNU GPL, read the file 'COPYING' for more information
9 */
11 #include "desktop.h"
12 #include "desktop-handles.h"
13 #include "display/sodipodi-ctrlrect.h"
14 #include "event-context.h"
15 #include "preferences.h"
16 #include "ui/tool/control-point.h"
17 #include "ui/tool/event-utils.h"
18 #include "ui/tool/selector.h"
20 namespace Inkscape {
21 namespace UI {
23 /** A hidden control point used for rubberbanding and selection.
24 * It uses a clever hack: the canvas item is hidden and only receives events when fed */
25 class SelectorPoint : public ControlPoint {
26 public:
27 SelectorPoint(SPDesktop *d, SPCanvasGroup *group, Selector *s)
28 : ControlPoint(d, Geom::Point(0,0), Gtk::ANCHOR_CENTER, SP_CTRL_SHAPE_SQUARE,
29 1, &invisible_cset, group)
30 , _selector(s)
31 , _cancel(false)
32 {
33 setVisible(false);
34 _rubber = static_cast<CtrlRect*>(sp_canvas_item_new(sp_desktop_controls(_desktop),
35 SP_TYPE_CTRLRECT, NULL));
36 sp_canvas_item_hide(_rubber);
38 signal_clicked.connect(sigc::mem_fun(*this, &SelectorPoint::_clicked));
39 signal_grabbed.connect(
40 sigc::bind_return(
41 sigc::hide(
42 sigc::mem_fun(*this, &SelectorPoint::_grabbed)),
43 false));
44 signal_dragged.connect(
45 sigc::hide<0>( sigc::hide(
46 sigc::mem_fun(*this, &SelectorPoint::_dragged))));
47 signal_ungrabbed.connect(sigc::mem_fun(*this, &SelectorPoint::_ungrabbed));
48 }
49 ~SelectorPoint() {
50 gtk_object_destroy(_rubber);
51 }
52 SPDesktop *desktop() { return _desktop; }
53 bool event(GdkEvent *e) {
54 return _eventHandler(e);
55 }
57 protected:
58 virtual bool _eventHandler(GdkEvent *event) {
59 if (event->type == GDK_KEY_PRESS && shortcut_key(event->key) == GDK_Escape &&
60 sp_canvas_item_is_visible(_rubber))
61 {
62 _cancel = true;
63 sp_canvas_item_hide(_rubber);
64 return true;
65 }
66 return ControlPoint::_eventHandler(event);
67 }
69 private:
70 bool _clicked(GdkEventButton *event) {
71 if (event->button != 1) return false;
72 _selector->signal_point.emit(position(), event);
73 return true;
74 }
75 void _grabbed() {
76 _cancel = false;
77 _start = position();
78 sp_canvas_item_show(_rubber);
79 }
80 void _dragged(Geom::Point &new_pos) {
81 if (_cancel) return;
82 Geom::Rect sel(_start, new_pos);
83 _rubber->setRectangle(sel);
84 }
85 void _ungrabbed(GdkEventButton *event) {
86 if (_cancel) return;
87 sp_canvas_item_hide(_rubber);
88 Geom::Rect sel(_start, position());
89 _selector->signal_area.emit(sel, event);
90 }
91 CtrlRect *_rubber;
92 Selector *_selector;
93 Geom::Point _start;
94 bool _cancel;
95 };
98 Selector::Selector(SPDesktop *d)
99 : Manipulator(d)
100 , _dragger(new SelectorPoint(d, sp_desktop_controls(d), this))
101 {
102 _dragger->setVisible(false);
103 }
105 Selector::~Selector()
106 {
107 delete _dragger;
108 }
110 bool Selector::event(GdkEvent *event)
111 {
112 switch (event->type) {
113 case GDK_BUTTON_PRESS:
114 _dragger->setPosition(_desktop->w2d(event_point(event->motion)));
115 break;
116 default: break;
117 }
118 return _dragger->event(event);
119 }
121 } // namespace UI
122 } // namespace Inkscape
124 /*
125 Local Variables:
126 mode:c++
127 c-file-style:"stroustrup"
128 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
129 indent-tabs-mode:nil
130 fill-column:99
131 End:
132 */
133 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :