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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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 v2+, read the file 'COPYING' for more information.
*/
#include <gdk/gdkkeysyms.h>
#include "zoom-tool.h"
#include "desktop.h"
#include "rubberband.h"
#include "selection-chemistry.h"
#include "include/macros.h"
namespace Inkscape {
namespace UI {
namespace Tools {
ZoomTool::ZoomTool(SPDesktop *desktop)
: ToolBase(desktop, "/tools/zoom", "zoom-in.svg")
, escaped(false)
{
Inkscape::Preferences *prefs = Inkscape::Preferences::get();
if (prefs->getBool("/tools/zoom/selcue")) {
this->enableSelectionCue();
}
if (prefs->getBool("/tools/zoom/gradientdrag")) {
this->enableGrDrag();
}
}
ZoomTool::~ZoomTool()
{
this->enableGrDrag(false);
ungrabCanvasEvents();
}
bool ZoomTool::root_handler(GdkEvent* event) {
Inkscape::Preferences *prefs = Inkscape::Preferences::get();
tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
double const zoom_inc = prefs->getDoubleLimited("/options/zoomincrement/value", M_SQRT2, 1.01, 10);
bool 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) {
// 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(button_dt, zoom_rel);
ret = true;
}
grabCanvasEvents(Gdk::KEY_PRESS_MASK |
Gdk::KEY_RELEASE_MASK |
Gdk::BUTTON_PRESS_MASK |
Gdk::BUTTON_RELEASE_MASK |
Gdk::POINTER_MOTION_MASK );
break;
}
case GDK_MOTION_NOTIFY:
if ((event->motion.state & GDK_BUTTON1_MASK)) {
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) {
Geom::OptRect const b = Inkscape::Rubberband::get(_desktop)->getRectangle();
if (b && !within_tolerance && !(GDK_SHIFT_MASK & event->button.state) ) {
_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(button_dt, zoom_rel);
}
ret = true;
}
Inkscape::Rubberband::get(_desktop)->stop();
ungrabCanvasEvents();
xp = yp = 0;
escaped = false;
break;
}
case GDK_KEY_PRESS:
switch (get_latin_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(event))
ret = true;
break;
case GDK_KEY_Shift_L:
case GDK_KEY_Shift_R:
this->set_cursor("zoom-out.svg");
break;
case GDK_KEY_Delete:
case GDK_KEY_KP_Delete:
case GDK_KEY_BackSpace:
ret = this->deleteSelectedDrag(MOD__CTRL_ONLY(event));
break;
default:
break;
}
break;
case GDK_KEY_RELEASE:
switch (get_latin_keyval (&event->key)) {
case GDK_KEY_Shift_L:
case GDK_KEY_Shift_R:
this->set_cursor("zoom-in.svg");
break;
default:
break;
}
break;
default:
break;
}
if (!ret) {
ret = ToolBase::root_handler(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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