aboutsummaryrefslogtreecommitdiff
path: root/src/tool_select.c
blob: acc6ac458e92c97f45456225bedf4bfb6633033d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
/*
 * tool_sekect.c
 *
 * Colloquium - A tiny presentation program
 *
 * Copyright (c) 2011 Thomas White <taw@bitwiz.org.uk>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <string.h>
#include <assert.h>

#include "presentation.h"
#include "objects.h"
#include "mainwindow.h"
#include "slide_render.h"


enum select_drag_reason
{
	SELECT_DRAG_REASON_NONE,
	SELECT_DRAG_REASON_POTENTIAL_MOVE,
	SELECT_DRAG_REASON_MOVE,
};


struct select_toolinfo
{
	struct toolinfo base;
	double drag_offs_x;
	double drag_offs_y;
	double box_x;
	double box_y;
	double box_width;
	double box_height;
	enum select_drag_reason drag_reason;
};


static void click_select(struct presentation *p, struct toolinfo *tip,
                         double x, double y, GdkEventButton *event,
                         enum drag_status *drag_status,
	                 enum drag_reason *drag_reason)
{
	struct select_toolinfo *ti = (struct select_toolinfo *)tip;
	struct object *clicked = p->editing_object;

	ti->drag_offs_x = clicked->x - x;
	ti->drag_offs_y = clicked->y - y;

	*drag_status = DRAG_STATUS_COULD_DRAG;
	*drag_reason = DRAG_REASON_TOOL;
	ti->drag_reason = SELECT_DRAG_REASON_POTENTIAL_MOVE;
}


static void update_box(struct select_toolinfo *ti, double x, double y,
                       struct object *o)
{
	double nx, ny;
	double eright, ebottom;

	nx = x + ti->drag_offs_x;
	ny = y + ti->drag_offs_y;

	/* Enforce margins */
	eright = o->parent->parent->slide_width - o->style->margin_right;
	ebottom = o->parent->parent->slide_height - o->style->margin_bottom;
	if ( nx < o->style->margin_left ) nx = o->style->margin_left;
	if ( ny < o->style->margin_top ) ny = o->style->margin_top;
	if ( nx+o->bb_width > eright ) nx = eright - o->bb_width;
	if ( ny+o->bb_height > ebottom ) ny = ebottom - o->bb_height;

	ti->box_x = nx;
	ti->box_y = ny;
	ti->box_width = o->bb_width;
	ti->box_height = o->bb_height;
}


static void drag(struct toolinfo *tip, struct presentation *p,
                 struct object *o, double x, double y)
{
	struct select_toolinfo *ti = (struct select_toolinfo *)tip;

	if ( ti->drag_reason == SELECT_DRAG_REASON_POTENTIAL_MOVE ) {
		ti->drag_reason = SELECT_DRAG_REASON_MOVE;
	}

	if ( ti->drag_reason != SELECT_DRAG_REASON_MOVE ) return;

	update_box(ti, x, y, o);

	redraw_overlay(p);
}


static void end_drag(struct toolinfo *tip, struct presentation *p,
                     struct object *o, double x, double y)
{
	struct select_toolinfo *ti = (struct select_toolinfo *)tip;

	update_box(ti, x, y, o);
	o->x = ti->box_x;
	o->y = ti->box_y;
	ti->drag_reason = SELECT_DRAG_REASON_NONE;
	redraw_slide(o->parent);
}


static void create_region(struct toolinfo *tip, struct presentation *p,
                          double x1, double y1, double x2, double y2)
{
	/* FIXME: Select multiple objects */
}


static void select_object(struct object *o,struct toolinfo *tip)
{
	/* Do nothing */
}


static int deselect_object(struct object *o,struct toolinfo *tip)
{
	/* Do nothing */
	return 0;
}


static void draw_overlay(struct toolinfo *tip, cairo_t *cr, struct object *o)
{
	struct select_toolinfo *ti = (struct select_toolinfo *)tip;

	if ( o != NULL ) {
		draw_editing_box(cr, o->x, o->y, o->bb_width, o->bb_height);
	}

	if ( ti->drag_reason == SELECT_DRAG_REASON_MOVE ) {
		draw_rubberband_box(cr, ti->box_x, ti->box_y,
		                        ti->box_width, ti->box_height);
	}
}


static void key_pressed(struct object *o, guint keyval, struct toolinfo *tip)
{
	/* Do nothing */
}


static void im_commit(struct object *o, gchar *str, struct toolinfo *tip)
{
	/* Do nothing */
}


static int valid_object(struct object *o)
{
	return 1;
}


static gint delete_sig(GtkWidget *widget, struct presentation *p)
{
	if ( p->editing_object == NULL ) return FALSE;

	delete_object(p->editing_object);
	p->editing_object = NULL;
	redraw_slide(p->cur_edit_slide);

	return FALSE;
}


static void realise(struct toolinfo *ti, GtkWidget *w, struct presentation *p)
{
	GtkWidget *hbox;
	GtkWidget *del;

	hbox = gtk_hbox_new(FALSE, 0.0);
	ti->tbox = hbox;

	del = gtk_button_new_from_stock(GTK_STOCK_DELETE);
	g_signal_connect(G_OBJECT(del), "clicked", G_CALLBACK(delete_sig), p);
	gtk_box_pack_start(GTK_BOX(hbox), del, 0, 0, FALSE);

	g_object_ref(ti->tbox);
	gtk_widget_show_all(ti->tbox);
}


struct toolinfo *initialise_select_tool()
{
	struct select_toolinfo *ti;

	ti = malloc(sizeof(*ti));

	ti->drag_reason = SELECT_DRAG_REASON_NONE;

	ti->base.click_select = click_select;
	ti->base.create_default = NULL;
	ti->base.select = select_object;
	ti->base.deselect = deselect_object;
	ti->base.drag = drag;
	ti->base.end_drag = end_drag;
	ti->base.create_region = create_region;
	ti->base.draw_editing_overlay = draw_overlay;
	ti->base.key_pressed = key_pressed;
	ti->base.im_commit = im_commit;
	ti->base.valid_object = valid_object;
	ti->base.realise = realise;

	return (struct toolinfo *)ti;
}