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Diffstat (limited to 'src/ui/tools/zoom-tool.cpp')
| -rw-r--r-- | src/ui/tools/zoom-tool.cpp | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/src/ui/tools/zoom-tool.cpp b/src/ui/tools/zoom-tool.cpp new file mode 100644 index 0000000..dec3a52 --- /dev/null +++ b/src/ui/tools/zoom-tool.cpp @@ -0,0 +1,214 @@ +// 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 : |