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/*
* 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;
}
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