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Diffstat (limited to 'src/ui/tool/control-point.cpp')
| -rw-r--r-- | src/ui/tool/control-point.cpp | 597 |
1 files changed, 597 insertions, 0 deletions
diff --git a/src/ui/tool/control-point.cpp b/src/ui/tool/control-point.cpp new file mode 100644 index 0000000..da6bdaf --- /dev/null +++ b/src/ui/tool/control-point.cpp @@ -0,0 +1,597 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Authors: + * Krzysztof Kosiński <tweenk.pl@gmail.com> + * Jon A. Cruz <jon@joncruz.org> + * + * Copyright (C) 2009 Authors + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include <iostream> + +#include <gdk/gdkkeysyms.h> +#include <gdkmm.h> + +#include <2geom/point.h> + +#include "desktop.h" +#include "message-context.h" + +#include "display/control/canvas-item-enums.h" +#include "display/control/snap-indicator.h" + +#include "object/sp-namedview.h" + +#include "ui/tools/tool-base.h" +#include "ui/tool/control-point.h" +#include "ui/tool/event-utils.h" +#include "ui/tool/transform-handle-set.h" + +#include "ui/widget/canvas.h" // Forced redraws + +namespace Inkscape { +namespace UI { + + +// Default colors for control points +ControlPoint::ColorSet ControlPoint::_default_color_set = { + {0xffffff00, 0x01000000}, // normal fill, stroke + {0xff0000ff, 0x01000000}, // mouseover fill, stroke + {0x0000ffff, 0x01000000}, // clicked fill, stroke + // + {0x0000ffff, 0x000000ff}, // normal fill, stroke when selected + {0xff000000, 0x000000ff}, // mouseover fill, stroke when selected + {0xff000000, 0x000000ff} // clicked fill, stroke when selected +}; + +ControlPoint *ControlPoint::mouseovered_point = nullptr; + +sigc::signal<void, ControlPoint*> ControlPoint::signal_mouseover_change; + +Geom::Point ControlPoint::_drag_event_origin(Geom::infinity(), Geom::infinity()); + +Geom::Point ControlPoint::_drag_origin(Geom::infinity(), Geom::infinity()); + +Gdk::EventMask const ControlPoint::_grab_event_mask = (Gdk::BUTTON_PRESS_MASK | + Gdk::BUTTON_RELEASE_MASK | + Gdk::POINTER_MOTION_MASK | + Gdk::KEY_PRESS_MASK | + Gdk::KEY_RELEASE_MASK | + Gdk::SCROLL_MASK | + Gdk::SMOOTH_SCROLL_MASK ); + +bool ControlPoint::_drag_initiated = false; +bool ControlPoint::_event_grab = false; + +ControlPoint::ColorSet ControlPoint::invisible_cset = { + {0x00000000, 0x00000000}, + {0x00000000, 0x00000000}, + {0x00000000, 0x00000000}, + {0x00000000, 0x00000000}, + {0x00000000, 0x00000000}, + {0x00000000, 0x00000000} +}; + +ControlPoint::ControlPoint(SPDesktop *d, Geom::Point const &initial_pos, SPAnchorType anchor, + Glib::RefPtr<Gdk::Pixbuf> pixbuf, + ColorSet const &cset, + Inkscape::CanvasItemGroup *group) + : _desktop(d) + , _cset(cset) + , _position(initial_pos) +{ + _canvas_item_ctrl = new Inkscape::CanvasItemCtrl(group ? group : _desktop->getCanvasControls(), + Inkscape::CANVAS_ITEM_CTRL_SHAPE_BITMAP); + _canvas_item_ctrl->set_name("CanvasItemCtrl:ControlPoint"); + _canvas_item_ctrl->set_pixbuf(pixbuf->gobj()); + _canvas_item_ctrl->set_fill( _cset.normal.fill); + _canvas_item_ctrl->set_stroke(_cset.normal.stroke); + _canvas_item_ctrl->set_anchor(anchor); + + _commonInit(); +} + +ControlPoint::ControlPoint(SPDesktop *d, Geom::Point const &initial_pos, SPAnchorType anchor, + Inkscape::CanvasItemCtrlType type, + ColorSet const &cset, + Inkscape::CanvasItemGroup *group) + : _desktop(d) + , _cset(cset) + , _position(initial_pos) +{ + _canvas_item_ctrl = new Inkscape::CanvasItemCtrl(group ? group : _desktop->getCanvasControls(), type); + _canvas_item_ctrl->set_name("CanvasItemCtrl:ControlPoint"); + _canvas_item_ctrl->set_fill( _cset.normal.fill); + _canvas_item_ctrl->set_stroke(_cset.normal.stroke); + _canvas_item_ctrl->set_anchor(anchor); + + _commonInit(); +} + +ControlPoint::~ControlPoint() +{ + // avoid storing invalid points in mouseovered_point + if (this == mouseovered_point) { + _clearMouseover(); + } + + //g_signal_handler_disconnect(G_OBJECT(_canvas_item_ctrl), _event_handler_connection); + _event_handler_connection.disconnect(); + _canvas_item_ctrl->hide(); + delete _canvas_item_ctrl; +} + +void ControlPoint::_commonInit() +{ + _canvas_item_ctrl->set_position(_position); + _event_handler_connection = + _canvas_item_ctrl->connect_event(sigc::bind(sigc::ptr_fun(_event_handler), this)); + // _event_handler_connection = g_signal_connect(G_OBJECT(_canvas_item_ctrl), "event", + // G_CALLBACK(_event_handler), this); +} + +void ControlPoint::setPosition(Geom::Point const &pos) +{ + _position = pos; + _canvas_item_ctrl->set_position(_position); +} + +void ControlPoint::move(Geom::Point const &pos) +{ + setPosition(pos); +} + +void ControlPoint::transform(Geom::Affine const &m) { + move(position() * m); +} + +bool ControlPoint::visible() const +{ + return _canvas_item_ctrl->is_visible(); +} + +void ControlPoint::setVisible(bool v) +{ + if (v) { + _canvas_item_ctrl->show(); + } else { + _canvas_item_ctrl->hide(); + } +} + +Glib::ustring ControlPoint::format_tip(char const *format, ...) +{ + va_list args; + va_start(args, format); + char *dyntip = g_strdup_vprintf(format, args); + va_end(args); + Glib::ustring ret = dyntip; + g_free(dyntip); + return ret; +} + + +// ===== Setters ===== + +void ControlPoint::_setSize(unsigned int size) +{ + _canvas_item_ctrl->set_size(size); +} + +void ControlPoint::_setControlType(Inkscape::CanvasItemCtrlType type) +{ + _canvas_item_ctrl->set_type(type); +} + +void ControlPoint::_setAnchor(SPAnchorType anchor) +{ +// g_object_set(_canvas_item_ctrl, "anchor", anchor, nullptr); +} + +void ControlPoint::_setPixbuf(Glib::RefPtr<Gdk::Pixbuf> p) +{ + _canvas_item_ctrl->set_pixbuf(Glib::unwrap(p)); +} + +// re-routes events into the virtual function TODO: Refactor this nonsense. +bool ControlPoint::_event_handler(GdkEvent *event, ControlPoint *point) +{ + if ((point == nullptr) || (point->_desktop == nullptr)) { + return false; + } + return point->_eventHandler(point->_desktop->event_context, event); +} + +// main event callback, which emits all other callbacks. +bool ControlPoint::_eventHandler(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event) +{ + // NOTE the static variables below are shared for all points! + // TODO handle clicks and drags from other buttons too + + if (event == nullptr) + { + return false; + } + + if (event_context == nullptr) + { + return false; + } + if (_desktop == nullptr) + { + return false; + } + if(event_context->getDesktop() !=_desktop) + { + g_warning ("ControlPoint: desktop pointers not equal!"); + //return false; + } + // offset from the pointer hotspot to the center of the grabbed knot in desktop coords + static Geom::Point pointer_offset; + // number of last doubleclicked button + static unsigned next_release_doubleclick = 0; + _double_clicked = false; + + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + int drag_tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100); + + switch(event->type) + { + case GDK_BUTTON_PRESS: + next_release_doubleclick = 0; + if (event->button.button == 1 && !event_context->is_space_panning()) { + // 1st mouse button click. internally, start dragging, but do not emit signals + // or change position until drag tolerance is exceeded. + _drag_event_origin[Geom::X] = event->button.x; + _drag_event_origin[Geom::Y] = event->button.y; + pointer_offset = _position - _desktop->w2d(_drag_event_origin); + _drag_initiated = false; + // route all events to this handler + _canvas_item_ctrl->grab(_grab_event_mask, nullptr); // cursor is null + _event_grab = true; + _setState(STATE_CLICKED); + return true; + } + return _event_grab; + + case GDK_2BUTTON_PRESS: + // store the button number for next release + next_release_doubleclick = event->button.button; + return true; + + case GDK_MOTION_NOTIFY: + if (_event_grab && ! event_context->is_space_panning()) { + _desktop->snapindicator->remove_snaptarget(); + bool transferred = false; + if (!_drag_initiated) { + bool t = fabs(event->motion.x - _drag_event_origin[Geom::X]) <= drag_tolerance && + fabs(event->motion.y - _drag_event_origin[Geom::Y]) <= drag_tolerance; + if (t){ + return true; + } + + // if we are here, it means the tolerance was just exceeded. + _drag_origin = _position; + transferred = grabbed(&event->motion); + // _drag_initiated might change during the above virtual call + _drag_initiated = true; + } + + if (!transferred) { + // dragging in progress + Geom::Point new_pos = _desktop->w2d(event_point(event->motion)) + pointer_offset; + // the new position is passed by reference and can be changed in the handlers. + dragged(new_pos, &event->motion); + move(new_pos); + _updateDragTip(&event->motion); // update dragging tip after moving to new position + + _desktop->scroll_to_point(new_pos); + _desktop->set_coordinate_status(_position); + sp_event_context_snap_delay_handler(event_context, nullptr, + (gpointer) this, &event->motion, + Inkscape::UI::Tools::DelayedSnapEvent::CONTROL_POINT_HANDLER); + } + return true; + } + break; + + case GDK_BUTTON_RELEASE: + if (_event_grab && event->button.button == 1) { + // If we have any pending snap event, then invoke it now! + // (This is needed because we might not have snapped on the latest GDK_MOTION_NOTIFY event + // if the mouse speed was too high. This is inherent to the snap-delay mechanism. + // We must snap at some point in time though, and this is our last chance) + // PS: For other contexts this is handled already in start_item_handler or start_root_handler + // if (_desktop && _desktop->event_context && _desktop->event_context->_delayed_snap_event) { + if (event_context->_delayed_snap_event) { + sp_event_context_snap_watchdog_callback(event_context->_delayed_snap_event); + } + + _canvas_item_ctrl->ungrab(); + _setMouseover(this, event->button.state); + _event_grab = false; + + if (_drag_initiated) { + // it is the end of a drag + _drag_initiated = false; + ungrabbed(&event->button); + return true; + } else { + // it is the end of a click + if (next_release_doubleclick) { + _double_clicked = true; + return doubleclicked(&event->button); + } else { + return clicked(&event->button); + } + } + } + break; + + case GDK_ENTER_NOTIFY: + _setMouseover(this, event->crossing.state); + return true; + case GDK_LEAVE_NOTIFY: + _clearMouseover(); + return true; + + case GDK_GRAB_BROKEN: + if (_event_grab && !event->grab_broken.keyboard) { + { + ungrabbed(nullptr); + } + _setState(STATE_NORMAL); + _event_grab = false; + _drag_initiated = false; + return true; + } + break; + + // update tips on modifier state change + // TODO add ESC keybinding as drag cancel + case GDK_KEY_PRESS: + switch (Inkscape::UI::Tools::get_latin_keyval(&event->key)) + { + case GDK_KEY_Escape: { + // ignore Escape if this is not a drag + if (!_drag_initiated) break; + + // temporarily disable snapping - we might snap to a different place than we were initially + event_context->discard_delayed_snap_event(); + SnapPreferences &snapprefs = _desktop->namedview->snap_manager.snapprefs; + bool snap_save = snapprefs.getSnapEnabledGlobally(); + snapprefs.setSnapEnabledGlobally(false); + + Geom::Point new_pos = _drag_origin; + + // make a fake event for dragging + // ASSUMPTION: dragging a point without modifiers will never prevent us from moving it + // to its original position + GdkEventMotion fake; + fake.type = GDK_MOTION_NOTIFY; + fake.window = event->key.window; + fake.send_event = event->key.send_event; + fake.time = event->key.time; + fake.x = _drag_event_origin[Geom::X]; // these two are normally not used in handlers + fake.y = _drag_event_origin[Geom::Y]; // (and shouldn't be) + fake.axes = nullptr; + fake.state = 0; // unconstrained drag + fake.is_hint = FALSE; + fake.device = nullptr; + fake.x_root = -1; // not used in handlers (and shouldn't be) + fake.y_root = -1; // can be used as a flag to check for cancelled drag + + dragged(new_pos, &fake); + + _canvas_item_ctrl->ungrab(); + _clearMouseover(); // this will also reset state to normal + _event_grab = false; + _drag_initiated = false; + + ungrabbed(nullptr); // ungrabbed handlers can handle a NULL event + snapprefs.setSnapEnabledGlobally(snap_save); + } + return true; + case GDK_KEY_Tab: + {// Downcast from ControlPoint to TransformHandle, if possible + // This is an ugly hack; we should have the transform handle intercept the keystrokes itself + TransformHandle *th = dynamic_cast<TransformHandle*>(this); + if (th) { + th->getNextClosestPoint(false); + return true; + } + break; + } + case GDK_KEY_ISO_Left_Tab: + {// Downcast from ControlPoint to TransformHandle, if possible + // This is an ugly hack; we should have the transform handle intercept the keystrokes itself + TransformHandle *th = dynamic_cast<TransformHandle*>(this); + if (th) { + th->getNextClosestPoint(true); + return true; + } + break; + } + default: + break; + } + // Do not break here, to allow for updating tooltips and such + case GDK_KEY_RELEASE: + if (mouseovered_point != this){ + return false; + } + if (_drag_initiated) { + return true; // this prevents the tool from overwriting the drag tip + } else { + unsigned state = state_after_event(event); + if (state != event->key.state) { + // we need to return true if there was a tip available, otherwise the tool's + // handler will process this event and set the tool's message, overwriting + // the point's message + return _updateTip(state); + } + } + break; + + default: break; + } + + // do not propagate events during grab - it might cause problems + return _event_grab; +} + +void ControlPoint::_setMouseover(ControlPoint *p, unsigned state) +{ + bool visible = p->visible(); + if (visible) { // invisible points shouldn't get mouseovered + p->_setState(STATE_MOUSEOVER); + } + p->_updateTip(state); + + if (visible && mouseovered_point != p) { + mouseovered_point = p; + signal_mouseover_change.emit(mouseovered_point); + } +} + +bool ControlPoint::_updateTip(unsigned state) +{ + Glib::ustring tip = _getTip(state); + if (!tip.empty()) { + _desktop->event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, + tip.data()); + return true; + } else { + _desktop->event_context->defaultMessageContext()->clear(); + return false; + } +} + +bool ControlPoint::_updateDragTip(GdkEventMotion *event) +{ + if (!_hasDragTips()) { + return false; + } + Glib::ustring tip = _getDragTip(event); + if (!tip.empty()) { + _desktop->event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, + tip.data()); + return true; + } else { + _desktop->event_context->defaultMessageContext()->clear(); + return false; + } +} + +void ControlPoint::_clearMouseover() +{ + if (mouseovered_point) { + mouseovered_point->_desktop->event_context->defaultMessageContext()->clear(); + mouseovered_point->_setState(STATE_NORMAL); + mouseovered_point = nullptr; + signal_mouseover_change.emit(mouseovered_point); + } +} + +void ControlPoint::transferGrab(ControlPoint *prev_point, GdkEventMotion *event) +{ + if (!_event_grab) return; + + grabbed(event); + prev_point->_canvas_item_ctrl->ungrab(); + _canvas_item_ctrl->grab(_grab_event_mask, nullptr); // cursor is null + + _drag_initiated = true; + + prev_point->_setState(STATE_NORMAL); + _setMouseover(this, event->state); +} + +void ControlPoint::_setState(State state) +{ + ColorEntry current = {0, 0}; + ColorSet const &activeCset = (_isLurking()) ? invisible_cset : _cset; + switch(state) { + case STATE_NORMAL: + current = activeCset.normal; + break; + case STATE_MOUSEOVER: + current = activeCset.mouseover; + break; + case STATE_CLICKED: + current = activeCset.clicked; + break; + }; + _setColors(current); + _state = state; +} + +// TODO: RENAME +void ControlPoint::_handleControlStyling() +{ + _canvas_item_ctrl->set_size_default(); +} + +void ControlPoint::_setColors(ColorEntry colors) +{ + _canvas_item_ctrl->set_fill(colors.fill); + _canvas_item_ctrl->set_stroke(colors.stroke); +} + +bool ControlPoint::_isLurking() +{ + return _lurking; +} + +void ControlPoint::_setLurking(bool lurking) +{ + if (lurking != _lurking) { + _lurking = lurking; + _setState(_state); // TODO refactor out common part + } +} + + +bool ControlPoint::_is_drag_cancelled(GdkEventMotion *event) +{ + return !event || event->x_root == -1; +} + +// dummy implementations for handlers + +bool ControlPoint::grabbed(GdkEventMotion * /*event*/) +{ + return false; +} + +void ControlPoint::dragged(Geom::Point &/*new_pos*/, GdkEventMotion * /*event*/) +{ +} + +void ControlPoint::ungrabbed(GdkEventButton * /*event*/) +{ +} + +bool ControlPoint::clicked(GdkEventButton * /*event*/) +{ + return false; +} + +bool ControlPoint::doubleclicked(GdkEventButton * /*event*/) +{ + return false; +} + +} // namespace UI +} // namespace Inkscape + +/* + 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:fileencoding=utf-8:textwidth=99 : |