#include <gdk/gdkkeysyms.h>

#include "macros.h"

#include "display/sp-ctrlline.h"

#include "display/sp-canvas-item.h"

#include "display/sp-canvas-util.h"

#include "desktop.h"

#include "pixmaps/cursor-measure.xpm"

#include "preferences.h"

#include "inkscape.h"

#include "desktop-handles.h"

#include "measure-context.h"

#include "display/canvas-text.h"

static void sp_measure_context_class_init(SPMeasureContextClass *klass);

static void sp_measure_context_init(SPMeasureContext *measure_context);

static void sp_measure_context_setup(SPEventContext *ec);

static void sp_measure_context_finish (SPEventContext *ec);

static gint sp_measure_context_root_handler(SPEventContext *event_context, GdkEvent *event);

static gint sp_measure_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);

static SPEventContextClass *parent_class;

static gint xp = 0, yp = 0; // where drag started

static gint tolerance = 0;

static bool within_tolerance = false;

static SPCanvasItem * line = NULL;

Geom::Point start_point;

SPCanvasItem *measure_text = NULL;

GType sp_measure_context_get_type(void)

{

static GType type = 0;

if (!type) {

GTypeInfo info = {

sizeof(SPMeasureContextClass),

NULL, NULL,

(GClassInitFunc) sp_measure_context_class_init,

NULL, NULL,

sizeof(SPMeasureContext),

4,

(GInstanceInitFunc) sp_measure_context_init,

NULL, /* value_table */

};

type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPMeasureContext", &info, (GTypeFlags) 0);

}

return type;

}

static void sp_measure_context_class_init(SPMeasureContextClass *klass)

{

SPEventContextClass *event_context_class = (SPEventContextClass *) klass;

parent_class = (SPEventContextClass*) g_type_class_peek_parent(klass);

event_context_class->setup = sp_measure_context_setup;

event_context_class->finish = sp_measure_context_finish;

event_context_class->root_handler = sp_measure_context_root_handler;

event_context_class->item_handler = sp_measure_context_item_handler;

}

static void sp_measure_context_init (SPMeasureContext *measure_context)

{

SPEventContext *event_context = SP_EVENT_CONTEXT(measure_context);

event_context->cursor_shape = cursor_measure_xpm;

event_context->hot_x = 3;

event_context->hot_y = 5;

}

static void

sp_measure_context_finish (SPEventContext *ec)

{

SPMeasureContext *mc = SP_MEASURE_CONTEXT(ec);

ec->enableGrDrag(false);

if (mc->grabbed) {

sp_canvas_item_ungrab(mc->grabbed, GDK_CURRENT_TIME);

mc->grabbed = NULL;

}

}

static void sp_measure_context_setup(SPEventContext *ec)

{

if (((SPEventContextClass *) parent_class)->setup) {

((SPEventContextClass *) parent_class)->setup(ec);

}

}

static gint sp_measure_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)

{

gint ret = FALSE;

if (((SPEventContextClass *) parent_class)->item_handler) {

ret = ((SPEventContextClass *) parent_class)->item_handler (event_context, item, event);

}

return ret;

}

static gint sp_measure_context_root_handler(SPEventContext *event_context, GdkEvent *event)

{

SPDesktop *desktop = event_context->desktop;

Inkscape::Preferences *prefs = Inkscape::Preferences::get();

tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);

SPMeasureContext *mc = SP_MEASURE_CONTEXT(event_context);

gint ret = FALSE;

switch (event->type) {

case GDK_BUTTON_PRESS:

{

Geom::Point const button_w(event->button.x, event->button.y);

start_point = desktop->w2d(button_w);

if (event->button.button == 1 && !event_context->space_panning) {

// save drag origin

xp = (gint) event->button.x;

yp = (gint) event->button.y;

within_tolerance = true;

ret = TRUE;

}

if (!line){

SPDesktop *desktop = inkscape_active_desktop();

line = sp_canvas_item_new(sp_desktop_controls(desktop), SP_TYPE_CTRLLINE, NULL);

}

if (!measure_text){

measure_text = sp_canvastext_new(sp_desktop_tempgroup(desktop), desktop, start_point, "");

SP_CANVASTEXT(measure_text)->rgba = 0x7f7f7fff;

sp_canvastext_set_anchor(SP_CANVASTEXT(measure_text), -1, 1);//why?

}

sp_ctrlline_set_coords (SP_CTRLLINE(line), start_point, start_point);

sp_canvastext_set_text (SP_CANVASTEXT(measure_text), "");

sp_canvas_item_show (line);

sp_canvas_item_show (measure_text);

sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),

GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK,

NULL, event->button.time);

mc->grabbed = SP_CANVAS_ITEM(desktop->acetate);

break;

}

case GDK_MOTION_NOTIFY:

{

if (event->motion.state & GDK_BUTTON1_MASK && !event_context->space_panning) {

ret = TRUE;

if ( within_tolerance

&& ( abs( (gint) event->motion.x - xp ) < tolerance )

&& ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {

break; // do not drag if we're within tolerance from origin

}

// Once the user has moved farther than tolerance from the original location

// (indicating they intend to move the object, not click), then always process the

// motion notify coordinates as given (no snapping back to origin)

within_tolerance = false;

Geom::Point const motion_w(event->motion.x, event->motion.y);

Geom::Point const motion_dt(desktop->w2d(motion_w));

sp_ctrlline_set_coords (SP_CTRLLINE(line), start_point[Geom::X], start_point[Geom::Y], motion_dt[Geom::X], motion_dt[Geom::Y]);

Geom::Point measure_text_pos = (start_point + motion_dt)/2;

double length = (start_point - motion_dt).length();

char* measure_str = (char*) malloc(sizeof(char)*20);

sprintf(measure_str, "%2f", length);

sp_canvastext_set_coords (SP_CANVASTEXT(measure_text), desktop->dt2doc(measure_text_pos));

sp_canvastext_set_text (SP_CANVASTEXT(measure_text), measure_str);

free(measure_str);

gobble_motion_events(GDK_BUTTON1_MASK);

}

break;

}

case GDK_BUTTON_RELEASE:

{

if (line){

sp_canvas_item_hide(line);

}

if (measure_text){

sp_canvas_item_hide(measure_text);

}

if (mc->grabbed) {

sp_canvas_item_ungrab(mc->grabbed, event->button.time);

mc->grabbed = NULL;

}

xp = yp = 0;

break;

}

default:

break;

}

if (!ret) {

if (((SPEventContextClass *) parent_class)->root_handler) {

ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);

}

}

return ret;

}