moving trunk for module inkscape

(bzr r1)

1 files changed, 473 insertions, 0 deletions

diff --git a/src/spiral-context.cpp b/src/spiral-context.cpp
new file mode 100644
index 000000000..c1640d427
--- /dev/null
+++ b/src/spiral-context.cpp
@@ -0,0 +1,473 @@
+#define __SP_SPIRAL_CONTEXT_C__
+
+/*
+ * Spiral drawing context
+ *
+ * Authors:
+ *   Mitsuru Oka
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   bulia byak <buliabyak@users.sf.net>
+ *
+ * Copyright (C) 1999-2001 Lauris Kaplinski
+ * Copyright (C) 2001-2002 Mitsuru Oka
+ *
+ * Released under GNU GPL
+ */
+
+#include "config.h"
+
+#include <gdk/gdkkeysyms.h>
+
+#include "macros.h"
+#include "display/sp-canvas.h"
+#include "sp-spiral.h"
+#include "document.h"
+#include "sp-namedview.h"
+#include "selection.h"
+#include "desktop-handles.h"
+#include "desktop-affine.h"
+#include "snap.h"
+#include "desktop.h"
+#include "desktop-style.h"
+#include "message-context.h"
+#include "pixmaps/cursor-spiral.xpm"
+#include "spiral-context.h"
+#include "sp-metrics.h"
+#include <glibmm/i18n.h>
+#include "object-edit.h"
+#include "xml/repr.h"
+#include "xml/node-event-vector.h"
+#include "prefs-utils.h"
+#include "context-fns.h"
+
+static void sp_spiral_context_class_init(SPSpiralContextClass * klass);
+static void sp_spiral_context_init(SPSpiralContext *spiral_context);
+static void sp_spiral_context_dispose(GObject *object);
+static void sp_spiral_context_setup(SPEventContext *ec);
+static void sp_spiral_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
+
+static gint sp_spiral_context_root_handler(SPEventContext *event_context, GdkEvent *event);
+
+static void sp_spiral_drag(SPSpiralContext *sc, NR::Point p, guint state);
+static void sp_spiral_finish(SPSpiralContext *sc);
+
+static SPEventContextClass *parent_class;
+
+GtkType
+sp_spiral_context_get_type()
+{
+    static GType type = 0;
+    if (!type) {
+        GTypeInfo info = {
+            sizeof(SPSpiralContextClass),
+            NULL, NULL,
+            (GClassInitFunc) sp_spiral_context_class_init,
+            NULL, NULL,
+            sizeof(SPSpiralContext),
+            4,
+            (GInstanceInitFunc) sp_spiral_context_init,
+            NULL,    /* value_table */
+        };
+        type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPSpiralContext", &info, (GTypeFlags)0);
+    }
+    return type;
+}
+
+static void
+sp_spiral_context_class_init(SPSpiralContextClass *klass)
+{
+    GObjectClass *object_class = (GObjectClass *) klass;
+    SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
+
+    parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
+
+    object_class->dispose = sp_spiral_context_dispose;
+
+    event_context_class->setup = sp_spiral_context_setup;
+    event_context_class->set = sp_spiral_context_set;
+    event_context_class->root_handler = sp_spiral_context_root_handler;
+}
+
+static void
+sp_spiral_context_init(SPSpiralContext *spiral_context)
+{
+    SPEventContext *event_context = SP_EVENT_CONTEXT(spiral_context);
+
+    event_context->cursor_shape = cursor_spiral_xpm;
+    event_context->hot_x = 4;
+    event_context->hot_y = 4;
+    event_context->xp = 0;
+    event_context->yp = 0;
+    event_context->tolerance = 0;
+    event_context->within_tolerance = false;
+    event_context->item_to_select = NULL;
+
+    event_context->shape_repr = NULL;
+    event_context->shape_knot_holder = NULL;
+
+    spiral_context->item = NULL;
+
+    spiral_context->revo = 3.0;
+    spiral_context->exp = 1.0;
+    spiral_context->t0 = 0.0;
+
+    new (&spiral_context->sel_changed_connection) sigc::connection();
+}
+
+static void
+sp_spiral_context_dispose(GObject *object)
+{
+    SPSpiralContext *sc = SP_SPIRAL_CONTEXT(object);
+    SPEventContext *ec = SP_EVENT_CONTEXT(object);
+
+    ec->enableGrDrag(false);
+
+    sc->sel_changed_connection.disconnect();
+    sc->sel_changed_connection.~connection();
+
+    /* fixme: This is necessary because we do not grab */
+    if (sc->item) sp_spiral_finish(sc);
+
+    if (ec->shape_knot_holder) {
+        sp_knot_holder_destroy(ec->shape_knot_holder);
+        ec->shape_knot_holder = NULL;
+    }
+
+    if (ec->shape_repr) { // remove old listener
+        sp_repr_remove_listener_by_data(ec->shape_repr, ec);
+        Inkscape::GC::release(ec->shape_repr);
+        ec->shape_repr = 0;
+    }
+
+    if (sc->_message_context) {
+        delete sc->_message_context;
+    }
+
+    G_OBJECT_CLASS(parent_class)->dispose(object);
+}
+
+static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
+    NULL, /* child_added */
+    NULL, /* child_removed */
+    ec_shape_event_attr_changed,
+    NULL, /* content_changed */
+    NULL  /* order_changed */
+};
+
+/**
+\brief  Callback that processes the "changed" signal on the selection;
+destroys old and creates new knotholder
+*/
+void
+sp_spiral_context_selection_changed(Inkscape::Selection *selection, gpointer data)
+{
+    SPSpiralContext *sc = SP_SPIRAL_CONTEXT(data);
+    SPEventContext *ec = SP_EVENT_CONTEXT(sc);
+
+    if (ec->shape_knot_holder) { // desktroy knotholder
+        sp_knot_holder_destroy(ec->shape_knot_holder);
+        ec->shape_knot_holder = NULL;
+    }
+
+    if (ec->shape_repr) { // remove old listener
+        sp_repr_remove_listener_by_data(ec->shape_repr, ec);
+        Inkscape::GC::release(ec->shape_repr);
+        ec->shape_repr = 0;
+    }
+
+    SPItem *item = selection->singleItem();
+    if (item) {
+        ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
+        Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
+        if (shape_repr) {
+            ec->shape_repr = shape_repr;
+            Inkscape::GC::anchor(shape_repr);
+            sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
+            sp_repr_synthesize_events(shape_repr, &ec_shape_repr_events, ec);
+        }
+    }
+}
+
+static void
+sp_spiral_context_setup(SPEventContext *ec)
+{
+    SPSpiralContext *sc = SP_SPIRAL_CONTEXT(ec);
+
+    if (((SPEventContextClass *) parent_class)->setup)
+        ((SPEventContextClass *) parent_class)->setup(ec);
+
+    sp_event_context_read(ec, "expansion");
+    sp_event_context_read(ec, "revolution");
+    sp_event_context_read(ec, "t0");
+
+    Inkscape::Selection *selection = SP_DT_SELECTION(ec->desktop);
+
+    SPItem *item = selection->singleItem();
+    if (item) {
+        ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
+        Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
+        if (shape_repr) {
+            ec->shape_repr = shape_repr;
+            Inkscape::GC::anchor(shape_repr);
+            sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
+            sp_repr_synthesize_events(shape_repr, &ec_shape_repr_events, ec);
+        }
+    }
+
+    sc->sel_changed_connection.disconnect();
+    sc->sel_changed_connection = selection->connectChanged(sigc::bind(sigc::ptr_fun(&sp_spiral_context_selection_changed), (gpointer)sc));
+
+    if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
+        ec->enableSelectionCue();
+    }
+
+    if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
+        ec->enableGrDrag();
+    }
+
+    sc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
+}
+
+static void
+sp_spiral_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
+{
+    SPSpiralContext *sc = SP_SPIRAL_CONTEXT(ec);
+
+    if (!strcmp(key, "expansion")) {
+        sc->exp = (val) ? g_ascii_strtod(val, NULL) : 1.0;
+        sc->exp = CLAMP(sc->exp, 0.0, 1000.0);
+    } else if (!strcmp(key, "revolution")) {
+        sc->revo = (val) ? g_ascii_strtod(val, NULL) : 3.0;
+        sc->revo = CLAMP(sc->revo, 0.05, 40.0);
+    } else if (!strcmp(key, "t0")) {
+        sc->t0 = (val) ? g_ascii_strtod(val, NULL) : 0.0;
+        sc->t0 = CLAMP(sc->t0, 0.0, 0.999);
+    }
+}
+
+static gint
+sp_spiral_context_root_handler(SPEventContext *event_context, GdkEvent *event)
+{
+    static gboolean dragging;
+
+    SPDesktop *desktop = event_context->desktop;
+    Inkscape::Selection *selection = SP_DT_SELECTION (desktop);
+    SPSpiralContext *sc = SP_SPIRAL_CONTEXT(event_context);
+
+    event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
+
+    gint ret = FALSE;
+
+    switch (event->type) {
+        case GDK_BUTTON_PRESS:
+            if (event->button.button == 1) {
+
+                dragging = TRUE;
+                sc->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
+
+                SnapManager const m(desktop->namedview);
+                sc->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT, sc->center, sc->item).getPoint();
+                
+                sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
+                                    ( GDK_KEY_PRESS_MASK |
+                                      GDK_BUTTON_RELEASE_MASK |
+                                      GDK_POINTER_MOTION_MASK |
+                                      GDK_BUTTON_PRESS_MASK    ),
+                                    NULL, event->button.time);
+                ret = TRUE;
+            }
+            break;
+        case GDK_MOTION_NOTIFY:
+            if (dragging && event->motion.state && GDK_BUTTON1_MASK) {
+
+                if ( event_context->within_tolerance
+                     && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
+                     && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->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 draw, not click), then always process the
+                // motion notify coordinates as given (no snapping back to origin)
+                event_context->within_tolerance = false;
+
+                NR::Point const motion_w(event->motion.x, event->motion.y);
+                NR::Point const motion_dt(event_context->desktop->w2d(motion_w));
+                sp_spiral_drag(sc, motion_dt, event->motion.state);
+                ret = TRUE;
+            }
+            break;
+        case GDK_BUTTON_RELEASE:
+            event_context->xp = event_context->yp = 0;
+            if (event->button.button == 1) {
+                dragging = FALSE;
+                if (!event_context->within_tolerance) {
+                    // we've been dragging, finish the spiral
+                    sp_spiral_finish(sc);
+                } else if (event_context->item_to_select) {
+                    // no dragging, select clicked item if any
+                    if (event->button.state & GDK_SHIFT_MASK) {
+                        selection->toggle(event_context->item_to_select);
+                    } else {
+                        selection->set(event_context->item_to_select);
+                    }
+                } else {
+                    // click in an empty space
+                    selection->clear();
+                }
+
+                event_context->item_to_select = NULL;
+                ret = TRUE;
+                sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
+            }
+            break;
+        case GDK_KEY_PRESS:
+            switch (get_group0_keyval(&event->key)) {
+                case GDK_Alt_R:
+                case GDK_Control_L:
+                case GDK_Control_R:
+                case GDK_Shift_L:
+                case GDK_Shift_R:
+                case GDK_Meta_L:  // Meta is when you press Shift+Alt (at least on my machine)
+                case GDK_Meta_R:
+                    sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
+                                               _("<b>Ctrl</b>: snap angle"),
+                                               NULL,
+                                               _("<b>Alt</b>: lock spiral radius"));
+                    break;
+                case GDK_Up:
+                case GDK_Down:
+                case GDK_KP_Up:
+                case GDK_KP_Down:
+                    // prevent the zoom field from activation
+                    if (!MOD__CTRL_ONLY)
+                        ret = TRUE;
+                    break;
+                case GDK_x:
+                case GDK_X:
+                    if (MOD__ALT_ONLY) {
+                        desktop->setToolboxFocusTo ("altx-spiral");
+                        ret = TRUE;
+                    }
+                    break;
+                case GDK_Escape:
+                    SP_DT_SELECTION(desktop)->clear();
+                    //TODO: make dragging escapable by Esc
+                default:
+                    break;
+            }
+            break;
+        case GDK_KEY_RELEASE:
+            switch (get_group0_keyval(&event->key)) {
+                case GDK_Alt_L:
+                case GDK_Alt_R:
+                case GDK_Control_L:
+                case GDK_Control_R:
+                case GDK_Shift_L:
+                case GDK_Shift_R:
+                case GDK_Meta_L:  // Meta is when you press Shift+Alt
+                case GDK_Meta_R:
+                    event_context->defaultMessageContext()->clear();
+                    break;
+                default:
+                    break;
+            }
+            break;
+        default:
+            break;
+    }
+
+    if (!ret) {
+        if (((SPEventContextClass *) parent_class)->root_handler)
+            ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
+    }
+
+    return ret;
+}
+
+static void
+sp_spiral_drag(SPSpiralContext *sc, NR::Point p, guint state)
+{
+    SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
+
+    int const snaps = prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12);
+
+    if (!sc->item) {
+
+        if (Inkscape::have_viable_layer(desktop, sc->_message_context) == false) {
+            return;
+        }
+
+        /* Create object */
+        Inkscape::XML::Node *repr = sp_repr_new("svg:path");
+        repr->setAttribute("sodipodi:type", "spiral");
+
+        /* Set style */
+        sp_desktop_apply_style_tool(desktop, repr, "tools.shapes.spiral", false);
+
+        sc->item = (SPItem *) desktop->currentLayer()->appendChildRepr(repr);
+        Inkscape::GC::release(repr);
+        sc->item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
+        sc->item->updateRepr();
+    }
+
+    NR::Point const p0 = sp_desktop_dt2root_xy_point(desktop, sc->center);
+    NR::Point p1 = sp_desktop_dt2root_xy_point(desktop, p);
+    SnapManager const m(desktop->namedview);
+    p1 = m.freeSnap(Inkscape::Snapper::SNAP_POINT, p1, sc->item).getPoint();
+
+    SPSpiral *spiral = SP_SPIRAL(sc->item);
+
+    NR::Point const delta = p1 - p0;
+    gdouble const rad = NR::L2(delta);
+
+    gdouble arg = NR::atan2(delta) - 2.0*M_PI*spiral->revo;
+
+    if (state & GDK_CONTROL_MASK) {
+        arg = sp_round(arg, M_PI/snaps);
+    }
+
+    /* Fixme: these parameters should be got from dialog box */
+    sp_spiral_position_set(spiral, p0[NR::X], p0[NR::Y],
+                           /*expansion*/ sc->exp,
+                           /*revolution*/ sc->revo,
+                           rad, arg,
+                           /*t0*/ sc->t0);
+
+    /* status text */
+    GString *rads = SP_PX_TO_METRIC_STRING(rad, desktop->namedview->getDefaultMetric());
+    sc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
+                               _("<b>Spiral</b>: radius %s, angle %5g&#176;; with <b>Ctrl</b> to snap angle"),
+                               rads->str, sp_round((arg + 2.0*M_PI*spiral->revo)*180/M_PI, 0.0001));
+    g_string_free(rads, FALSE);
+}
+
+static void
+sp_spiral_finish(SPSpiralContext *sc)
+{
+    sc->_message_context->clear();
+
+    if (sc->item != NULL) {
+        SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
+        SPSpiral  *spiral = SP_SPIRAL(sc->item);
+
+        sp_shape_set_shape(SP_SHAPE(spiral));
+        SP_OBJECT(spiral)->updateRepr(NULL, SP_OBJECT_WRITE_EXT);
+
+        SP_DT_SELECTION(desktop)->set(sc->item);
+        sp_document_done(SP_DT_DOCUMENT(desktop));
+
+        sc->item = NULL;
+    }
+}
+
+
+/*
+  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:encoding=utf-8:textwidth=99 :