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/*
* Handy zooming tool
*
* Authors:
* Lauris Kaplinski <lauris@kaplinski.com>
* Frank Felfe <innerspace@iname.com>
* bulia byak <buliabyak@users.sf.net>
*
* Copyright (C) 1999-2002 Authors
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#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_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 gint xp = 0, yp = 0; // where drag started
static gint tolerance = 0;
static bool within_tolerance = false;
static bool escaped;
G_DEFINE_TYPE(SPZoomContext, sp_zoom_context, SP_TYPE_EVENT_CONTEXT);
static void sp_zoom_context_class_init(SPZoomContextClass *klass)
{
SPEventContextClass *event_context_class = SP_EVENT_CONTEXT_CLASS(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(sp_zoom_context_parent_class))->setup) {
(SP_EVENT_CONTEXT_CLASS(sp_zoom_context_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(sp_zoom_context_parent_class))->item_handler) {
ret = (SP_EVENT_CONTEXT_CLASS(sp_zoom_context_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(sp_zoom_context_parent_class))->root_handler) {
ret = (SP_EVENT_CONTEXT_CLASS(sp_zoom_context_parent_class))->root_handler(event_context, event);
}
}
return ret;
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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