#include <gdk/gdkkeysyms.h>

#include "macros.h"

#include "rubberband.h"

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

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

#include "desktop.h"

#include "pixmaps/cursor-zoom.xpm"

#include "pixmaps/cursor-zoom-out.xpm"

#include "preferences.h"

#include "selection-chemistry.h"

#include "zoom-context.h"

static void sp_zoom_context_class_init(SPZoomContextClass *klass);

static void sp_zoom_context_init(SPZoomContext *zoom_context);

static void sp_zoom_context_setup(SPEventContext *ec);

static void sp_zoom_context_finish (SPEventContext *ec);

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

static gint sp_zoom_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 bool escaped;

GType sp_zoom_context_get_type(void)

{

static GType type = 0;

if (!type) {

GTypeInfo info = {

sizeof(SPZoomContextClass),

NULL, NULL,

(GClassInitFunc) sp_zoom_context_class_init,

NULL, NULL,

sizeof(SPZoomContext),

4,

(GInstanceInitFunc) sp_zoom_context_init,

NULL, /* value_table */

};

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

}

return type;

}

static void sp_zoom_context_class_init(SPZoomContextClass *klass)

{

SPEventContextClass *event_context_class = SP_EVENT_CONTEXT_CLASS(klass);

parent_class = SP_EVENT_CONTEXT_CLASS(g_type_class_peek_parent(klass));

event_context_class->setup = sp_zoom_context_setup;

event_context_class->finish = sp_zoom_context_finish;

event_context_class->root_handler = sp_zoom_context_root_handler;

event_context_class->item_handler = sp_zoom_context_item_handler;

}

static void sp_zoom_context_init (SPZoomContext *zoom_context)

{

SPEventContext *event_context = SP_EVENT_CONTEXT(zoom_context);

event_context->cursor_shape = cursor_zoom_xpm;

event_context->hot_x = 6;

event_context->hot_y = 6;

}

static void

sp_zoom_context_finish (SPEventContext *ec)

{

SPZoomContext *zc = SP_ZOOM_CONTEXT(ec);

ec->enableGrDrag(false);

if (zc->grabbed) {

sp_canvas_item_ungrab(zc->grabbed, GDK_CURRENT_TIME);

zc->grabbed = NULL;

}

}

static void sp_zoom_context_setup(SPEventContext *ec)

{

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

if (prefs->getBool("/tools/zoom/selcue")) {

ec->enableSelectionCue();

}

if (prefs->getBool("/tools/zoom/gradientdrag")) {

ec->enableGrDrag();

}

if ((SP_EVENT_CONTEXT_CLASS(parent_class))->setup) {

(SP_EVENT_CONTEXT_CLASS(parent_class))->setup(ec);

}

}

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

{

gint ret = FALSE;

if ((SP_EVENT_CONTEXT_CLASS(parent_class))->item_handler) {

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

}

return ret;

}

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

{

SPDesktop *desktop = event_context->desktop;

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

SPZoomContext *zc = SP_ZOOM_CONTEXT(event_context);

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

double const zoom_inc = prefs->getDoubleLimited("/options/zoomincrement/value", M_SQRT2, 1.01, 10);

gint ret = FALSE;

switch (event->type) {

case GDK_BUTTON_PRESS:

{

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

Geom::Point const button_dt(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;

Inkscape::Rubberband::get(desktop)->start(desktop, button_dt);

escaped = false;

ret = TRUE;

} else if (event->button.button == 3) {

double const zoom_rel( (event->button.state & GDK_SHIFT_MASK)

? zoom_inc

: 1 / zoom_inc );

desktop->zoom_relative_keep_point(button_dt, zoom_rel);

ret = TRUE;

}

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);

zc->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));

Inkscape::Rubberband::get(desktop)->move(motion_dt);

gobble_motion_events(GDK_BUTTON1_MASK);

}

break;

case GDK_BUTTON_RELEASE:

{

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

Geom::Point const button_dt(desktop->w2d(button_w));

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

Geom::OptRect const b = Inkscape::Rubberband::get(desktop)->getRectangle();

if (b && !within_tolerance) {

desktop->set_display_area(*b, 10);

} else if (!escaped) {

double const zoom_rel( (event->button.state & GDK_SHIFT_MASK)

? 1 / zoom_inc

: zoom_inc );

desktop->zoom_relative_keep_point(button_dt, zoom_rel);

}

ret = TRUE;

}

Inkscape::Rubberband::get(desktop)->stop();

if (zc->grabbed) {

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

zc->grabbed = NULL;

}

xp = yp = 0;

escaped = false;

break;

}

case GDK_KEY_PRESS:

switch (get_group0_keyval (&event->key)) {

case GDK_KEY_Escape:

if (!Inkscape::Rubberband::get(desktop)->is_started()) {

Inkscape::SelectionHelper::selectNone(desktop);

}

Inkscape::Rubberband::get(desktop)->stop();

xp = yp = 0;

escaped = true;

ret = TRUE;

break;

case GDK_KEY_Up:

case GDK_KEY_Down:

case GDK_KEY_KP_Up:

case GDK_KEY_KP_Down:

// prevent the zoom field from activation

if (!MOD__CTRL_ONLY)

ret = TRUE;

break;

case GDK_KEY_Shift_L:

case GDK_KEY_Shift_R:

event_context->cursor_shape = cursor_zoom_out_xpm;

sp_event_context_update_cursor(event_context);

break;

case GDK_KEY_Delete:

case GDK_KEY_KP_Delete:

case GDK_KEY_BackSpace:

ret = event_context->deleteSelectedDrag(MOD__CTRL_ONLY);

break;

default:

break;

}

break;

case GDK_KEY_RELEASE:

switch (get_group0_keyval (&event->key)) {

case GDK_KEY_Shift_L:

case GDK_KEY_Shift_R:

event_context->cursor_shape = cursor_zoom_xpm;

sp_event_context_update_cursor(event_context);

break;

default:

break;

}

break;

default:

break;

}

if (!ret) {

if ((SP_EVENT_CONTEXT_CLASS(parent_class))->root_handler) {

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

}

}

return ret;

}