Code

Enable item-selection by cycling through them (using Alt+mouse wheel scroll).
[inkscape.git] / src / select-context.cpp
index 1daf6b0e56967be6363dfba5b2c67f47feb2b4df..96758a9f13d76f528b352fc533cad02f202fc6cf 100644 (file)
@@ -1,11 +1,10 @@
-#define __SP_SELECT_CONTEXT_C__
-
 /*
  * Selection and transformation context
  *
  * Authors:
  *   Lauris Kaplinski <lauris@kaplinski.com>
  *   bulia byak <buliabyak@users.sf.net>
+ *   Abhishek Sharma
  *
  * Copyright (C) 2006      Johan Engelen <johan@shouraizou.nl>
  * Copyright (C) 1999-2005 Authors
@@ -41,6 +40,9 @@
 #include "selection-describer.h"
 #include "seltrans.h"
 #include "box3d.h"
+#include "display/nr-arena-item.h"
+
+using Inkscape::DocumentUndo;
 
 static void sp_select_context_class_init(SPSelectContextClass *klass);
 static void sp_select_context_init(SPSelectContext *select_context);
@@ -98,6 +100,22 @@ sp_select_context_class_init(SPSelectContextClass *klass)
     event_context_class->set = sp_select_context_set;
     event_context_class->root_handler = sp_select_context_root_handler;
     event_context_class->item_handler = sp_select_context_item_handler;
+}
+
+static void
+sp_select_context_init(SPSelectContext *sc)
+{
+    sc->dragging = FALSE;
+    sc->moved = FALSE;
+    sc->button_press_shift = false;
+    sc->button_press_ctrl = false;
+    sc->button_press_alt = false;
+    sc->is_cycling = false;
+    sc->cycling_items = NULL;
+    sc->cycling_items_selected_before = NULL;
+    sc->cycling_cur_item = NULL;
+    sc->_seltrans = NULL;
+    sc->_describer = NULL;
 
     // cursors in select context
     CursorSelectMouseover = sp_cursor_new_from_xpm(cursor_select_m_xpm , 1, 1);
@@ -116,19 +134,6 @@ sp_select_context_class_init(SPSelectContextClass *klass)
     handles[10] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_sw_xpm);
     handles[11] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_rotate_w_xpm);
     handles[12] = gdk_pixbuf_new_from_xpm_data((gchar const **)handle_center_xpm);
-
-}
-
-static void
-sp_select_context_init(SPSelectContext *sc)
-{
-    sc->dragging = FALSE;
-    sc->moved = FALSE;
-    sc->button_press_shift = false;
-    sc->button_press_ctrl = false;
-    sc->button_press_alt = false;
-    sc->_seltrans = NULL;
-    sc->_describer = NULL;
 }
 
 static void
@@ -172,7 +177,12 @@ sp_select_context_setup(SPEventContext *ec)
 
     SPDesktop *desktop = ec->desktop;
 
-    select_context->_describer = new Inkscape::SelectionDescriber(desktop->selection, desktop->messageStack());
+    select_context->_describer = new Inkscape::SelectionDescriber(
+                desktop->selection, 
+                desktop->messageStack(),
+                _("Click selection to toggle scale/rotation handles"),
+                _("No objects selected. Click, Shift+click, Alt+scroll mouse on top of objects, or drag around objects to select.")
+        );
 
     select_context->_seltrans = new Inkscape::SelTrans(desktop);
 
@@ -212,12 +222,13 @@ sp_select_context_abort(SPEventContext *event_context)
             seltrans->ungrab();
             sc->moved = FALSE;
             sc->dragging = FALSE;
+            sp_event_context_discard_delayed_snap_event(event_context);
             drag_escaped = 1;
 
             if (sc->item) {
                 // only undo if the item is still valid
                 if (SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))) {
-                    sp_document_undo(sp_desktop_document(desktop));
+                    DocumentUndo::undo(sp_desktop_document(desktop));
                 }
 
                 sp_object_unref( SP_OBJECT(sc->item), NULL);
@@ -225,7 +236,7 @@ sp_select_context_abort(SPEventContext *event_context)
                 // NOTE:  This is a workaround to a bug.
                 // When the ctrl key is held, sc->item is not defined
                 // so in this case (only), we skip the object doc check
-                sp_document_undo(sp_desktop_document(desktop));
+                DocumentUndo::undo(sp_desktop_document(desktop));
             }
             sc->item = NULL;
 
@@ -325,8 +336,10 @@ sp_select_context_item_handler(SPEventContext *event_context, SPItem *item, GdkE
                     sc->dragging = TRUE;
                     sc->moved = FALSE;
 
+                    gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, CursorSelectDragging);
+
                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
-                    
+
                     // remember the clicked item in sc->item:
                     if (sc->item) {
                         sp_object_unref(sc->item, NULL);
@@ -360,14 +373,15 @@ sp_select_context_item_handler(SPEventContext *event_context, SPItem *item, GdkE
 
         case GDK_ENTER_NOTIFY:
         {
-            GdkCursor *cursor = gdk_cursor_new(GDK_FLEUR);
-            gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, cursor);
-            gdk_cursor_destroy(cursor);
+            if (!desktop->isWaitingCursor() && !sc->dragging) {
+                gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, CursorSelectMouseover);
+            }
             break;
         }
 
         case GDK_LEAVE_NOTIFY:
-            gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
+            if (!desktop->isWaitingCursor() && !sc->dragging)
+                gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
             break;
 
         case GDK_KEY_PRESS:
@@ -392,6 +406,43 @@ sp_select_context_item_handler(SPEventContext *event_context, SPItem *item, GdkE
     return ret;
 }
 
+static void
+sp_select_context_cycle_through_items(SPSelectContext *sc, Inkscape::Selection *selection, GdkEventScroll *scroll_event, bool shift_pressed) {
+    if (!sc->cycling_cur_item)
+        return;
+
+    NRArenaItem *arenaitem;
+    SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
+    SPItem *item = SP_ITEM(sc->cycling_cur_item->data);
+
+    // Deactivate current item
+    if (!g_list_find(sc->cycling_items_selected_before, item) && selection->includes(item))
+        selection->remove(item);
+    arenaitem = item->get_arenaitem(desktop->dkey);
+    nr_arena_item_set_opacity (arenaitem, 0.3);
+
+    // Find next item and activate it
+    GList *next;
+    if (scroll_event->direction == GDK_SCROLL_UP) {
+        next = sc->cycling_cur_item->next;
+        if (next == NULL)
+            next = sc->cycling_items;
+    } else {
+        next = sc->cycling_cur_item->prev;
+        if (next == NULL)
+            next = g_list_last(sc->cycling_items);
+    }
+    sc->cycling_cur_item = next;
+    item = SP_ITEM(sc->cycling_cur_item->data);
+    arenaitem = item->get_arenaitem(desktop->dkey);
+    nr_arena_item_set_opacity (arenaitem, 1.0);
+
+    if (shift_pressed)
+        selection->add(item);
+    else
+        selection->set(item);
+}
+
 static gint
 sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 {
@@ -405,11 +456,6 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
     Inkscape::Selection *selection = sp_desktop_selection(desktop);
     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 
-    gdouble const nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000); // in px
-    gdouble const offset = prefs->getDoubleLimited("/options/defaultscale/value", 2, 0, 1000);
-    tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
-    int const snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
-
     // make sure we still have valid objects to move around
     if (sc->item && SP_OBJECT_DOCUMENT( SP_OBJECT(sc->item))==NULL) {
         sp_select_context_abort(event_context);
@@ -424,10 +470,13 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
                         desktop->setCurrentLayer(reinterpret_cast<SPObject *>(clicked_item));
                         sp_desktop_selection(desktop)->clear();
                         sc->dragging = false;
+                        sp_event_context_discard_delayed_snap_event(event_context);
 
                         sp_canvas_end_forced_full_redraws(desktop->canvas);
                     } else { // switch tool
-                        tools_switch_by_item (desktop, clicked_item);
+                        Geom::Point const button_pt(event->button.x, event->button.y);
+                        Geom::Point const p(desktop->w2d(button_pt));
+                        tools_switch_by_item (desktop, clicked_item, p);
                     }
                 } else {
                     sp_select_context_up_one_layer(desktop);
@@ -474,7 +523,24 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
             break;
 
         case GDK_MOTION_NOTIFY:
-            if (event->motion.state & GDK_BUTTON1_MASK && !event_context->space_panning) {
+        {
+            SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
+            if (sc->is_cycling) {
+                // Abort cycle-select
+                NRArenaItem *arenaitem;
+                for (GList *l = sc->cycling_items; l != NULL; l = g_list_next(l)) {
+                    arenaitem = item->get_arenaitem(desktop->dkey);
+                    nr_arena_item_set_opacity (arenaitem, 1.0);
+                }
+                g_list_free(sc->cycling_items);
+                g_list_free(sc->cycling_items_selected_before);
+                sc->cycling_items = NULL;
+                sc->cycling_cur_item = NULL;
+                sc->is_cycling = false;
+            }
+
+               tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
+               if (event->motion.state & GDK_BUTTON1_MASK && !event_context->space_panning) {
                 Geom::Point const motion_pt(event->motion.x, event->motion.y);
                 Geom::Point const p(desktop->w2d(motion_pt));
 
@@ -491,7 +557,8 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
                 if (sc->button_press_ctrl || (sc->button_press_alt && !sc->button_press_shift && !selection->isEmpty())) {
                     // if it's not click and ctrl or alt was pressed (the latter with some selection
                     // but not with shift) we want to drag rather than rubberband
-                    sc->dragging = TRUE;
+                       sc->dragging = TRUE;
+                    gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, CursorSelectDragging);
 
                     sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
                 }
@@ -502,19 +569,21 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
                     // and also when we started within tolerance, but trespassed tolerance outside of item
                     Inkscape::Rubberband::get(desktop)->stop();
                     SP_EVENT_CONTEXT(sc)->defaultMessageContext()->clear();
-                    item_at_point = desktop->item_at_point(Geom::Point(event->button.x, event->button.y), FALSE);
+                    item_at_point = desktop->getItemAtPoint(Geom::Point(event->button.x, event->button.y), FALSE);
                     if (!item_at_point) // if no item at this point, try at the click point (bug 1012200)
-                        item_at_point = desktop->item_at_point(Geom::Point(xp, yp), FALSE);
+                        item_at_point = desktop->getItemAtPoint(Geom::Point(xp, yp), FALSE);
                     if (item_at_point || sc->moved || sc->button_press_alt) {
                         // drag only if starting from an item, or if something is already grabbed, or if alt-dragging
                         if (!sc->moved) {
-                            item_in_group = desktop->item_at_point(Geom::Point(event->button.x, event->button.y), TRUE);
-                            group_at_point = desktop->group_at_point(Geom::Point(event->button.x, event->button.y));
+                            item_in_group = desktop->getItemAtPoint(Geom::Point(event->button.x, event->button.y), TRUE);
+                            group_at_point = desktop->getGroupAtPoint(Geom::Point(event->button.x, event->button.y));
+                            if (SP_IS_LAYER(selection->single()))
+                                group_at_point = SP_GROUP(selection->single());
 
-                            // group-at-point is meant to be topmost item if it's a group, 
+                            // group-at-point is meant to be topmost item if it's a group,
                             // not topmost group of all items at point
-                            if (group_at_point != item_in_group && 
-                                !(group_at_point && item_at_point && 
+                            if (group_at_point != item_in_group &&
+                                !(group_at_point && item_at_point &&
                                   group_at_point->isAncestorOf(item_at_point)))
                                 group_at_point = NULL;
 
@@ -530,7 +599,7 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
                                 if (item_at_point && !selection->includes(item_at_point))
                                     selection->set(item_at_point);
                             } // otherwise, do not change selection so that dragging selected-within-group items, as well as alt-dragging, is possible
-                            seltrans->grab(p, -1, -1, FALSE);
+                            seltrans->grab(p, -1, -1, FALSE, TRUE);
                             sc->moved = TRUE;
                         }
                         if (!seltrans->isEmpty())
@@ -540,7 +609,7 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
                         ret = TRUE;
                     } else {
                         sc->dragging = FALSE;
-
+                        sp_event_context_discard_delayed_snap_event(event_context);
                         sp_canvas_end_forced_full_redraws(desktop->canvas);
                     }
                 } else {
@@ -556,6 +625,7 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
                 }
             }
             break;
+        }
         case GDK_BUTTON_RELEASE:
             xp = yp = 0;
             if ((event->button.button == 1) && (sc->grabbed) && !event_context->space_panning) {
@@ -572,9 +642,12 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
                                 seltrans->resetState();
                                 selection->toggle(sc->item);
                             } else {
+                                SPObject* single = selection->single();
                                 // without shift, increase state (i.e. toggle scale/rotation handles)
                                 if (selection->includes(sc->item)) {
                                     seltrans->increaseState();
+                                } else if (SP_IS_LAYER(single) && single->isAncestorOf(sc->item)) {
+                                    seltrans->increaseState();
                                 } else {
                                     seltrans->resetState();
                                     selection->set(sc->item);
@@ -586,7 +659,8 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
                         }
                     }
                     sc->dragging = FALSE;
-
+                    gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, CursorSelectMouseover);
+                    sp_event_context_discard_delayed_snap_event(event_context);
                     sp_canvas_end_forced_full_redraws(desktop->canvas);
 
                     if (sc->item) {
@@ -594,15 +668,15 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
                     }
                     sc->item = NULL;
                 } else {
-                    Inkscape::Rubberband::Rubberband *r = Inkscape::Rubberband::get(desktop);
+                    Inkscape::Rubberband *r = Inkscape::Rubberband::get(desktop);
                     if (r->is_started() && !within_tolerance) {
                         // this was a rubberband drag
                         GSList *items = NULL;
                         if (r->getMode() == RUBBERBAND_MODE_RECT) {
                             Geom::OptRect const b = r->getRectangle();
-                            items = sp_document_items_in_box(sp_desktop_document(desktop), desktop->dkey, *b);
+                            items = sp_desktop_document(desktop)->getItemsInBox(desktop->dkey, *b);
                         } else if (r->getMode() == RUBBERBAND_MODE_TOUCHPATH) {
-                            items = sp_document_items_at_points(sp_desktop_document(desktop), desktop->dkey, r->getPoints());
+                            items = sp_desktop_document(desktop)->getItemsAtPoints(desktop->dkey, r->getPoints());
                         }
 
                         seltrans->resetState();
@@ -673,7 +747,7 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
                     sp_canvas_item_ungrab(sc->grabbed, event->button.time);
                     sc->grabbed = NULL;
                 }
-                
+
                 desktop->updateNow();
             }
             if (event->button.button == 1) {
@@ -684,10 +758,47 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
             sc->button_press_alt = false;
             break;
 
+        case GDK_SCROLL:
+        {
+            SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
+            GdkEventScroll *scroll_event = (GdkEventScroll*) event;
+
+            if (scroll_event->state & GDK_MOD1_MASK) { // alt modified pressed
+                bool shift_pressed = scroll_event->state & GDK_SHIFT_MASK;
+
+                if(sc->is_cycling == false) {
+                    // Build a list of items underneath the mouse pointer (for cycle-selection) and reduce their opacity
+                    Geom::Point p = desktop->d2w(desktop->point());
+                    SPItem *item = desktop->getItemAtPoint(p, true, NULL);
+                    while(item != NULL) {
+                        sc->cycling_items = g_list_append(sc->cycling_items, item);
+                        if (selection->includes(item)) {
+                            // already selected items are stored separately, too
+                            sc->cycling_items_selected_before = g_list_append(sc->cycling_items_selected_before, item);
+                        }
+                        NRArenaItem *arenaitem = item->get_arenaitem(desktop->dkey);
+                        nr_arena_item_set_opacity (arenaitem, 0.3);
+
+                        item = desktop->getItemAtPoint(p, true, item);
+                    }
+                    // Here we set the current item to the bottommost one so that the cycling step below re-starts at the top
+                    sc->cycling_cur_item = g_list_last(sc->cycling_items);
+                    sc->is_cycling = true;
+                }
+
+                // Cycle through the items underneath the mouse pointer, one-by-one
+                sp_select_context_cycle_through_items(sc, selection, scroll_event, shift_pressed);
+
+                ret = TRUE;
+            }
+            break;
+        }
+
         case GDK_KEY_PRESS: // keybindings for select context
 
-            {
-            guint keyval = get_group0_keyval(&event->key);
+                       {
+                       {
+               guint keyval = get_group0_keyval(&event->key);
             bool alt = ( MOD__ALT
                                     || (keyval == GDK_Alt_L)
                                     || (keyval == GDK_Alt_R)
@@ -711,19 +822,21 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
                     sp_event_show_modifier_tip (event_context->defaultMessageContext(), event,
                                                 _("<b>Ctrl</b>: click to select in groups; drag to move hor/vert"),
                                                 _("<b>Shift</b>: click to toggle select; drag for rubberband selection"),
-                                                _("<b>Alt</b>: click to select under; drag to move selected or select by touch"));
+                                                _("<b>Alt</b>: click to select under; scroll mouse-wheel to cycle-select; drag to move selected or select by touch"));
                     // if Alt and nonempty selection, show moving cursor ("move selected"):
-                    if (alt && !selection->isEmpty()) {
-                        GdkCursor *cursor = gdk_cursor_new(GDK_FLEUR);
-                        gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, cursor);
-                        gdk_cursor_destroy(cursor);
+                    if (alt && !selection->isEmpty() && !desktop->isWaitingCursor()) {
+                        gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, CursorSelectDragging);
                     }
                     //*/
                     break;
             }
-            }
+                       }
+
+            gdouble const nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000); // in px
+                       gdouble const offset = prefs->getDoubleLimited("/options/defaultscale/value", 2, 0, 1000);
+                       int const snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
 
-            switch (get_group0_keyval (&event->key)) {
+                       switch (get_group0_keyval (&event->key)) {
                 case GDK_Left: // move selection left
                 case GDK_KP_Left:
                 case GDK_KP_4:
@@ -797,6 +910,7 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
                         selection->clear();
                     ret = TRUE;
                     break;
+
                 case GDK_a:
                 case GDK_A:
                     if (MOD__CTRL_ONLY) {
@@ -902,7 +1016,7 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
                         }
                         ret = TRUE;
                     }
-                    break;                  
+                    break;
                 case GDK_g:
                 case GDK_G:
                     if (MOD__SHIFT_ONLY) {
@@ -914,7 +1028,7 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
                     break;
             }
             break;
-
+                       }
         case GDK_KEY_RELEASE:
             {
             guint keyval = get_group0_keyval(&event->key);
@@ -932,10 +1046,29 @@ sp_select_context_root_handler(SPEventContext *event_context, GdkEvent *event)
                 if (alt) {
                     Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_RECT);
                 }
+            } else {
+                if (alt && sc->is_cycling) {
+                    // quit cycle-selection and reset opacities
+                    SPSelectContext *sc = SP_SELECT_CONTEXT(event_context);
+                    NRArenaItem *arenaitem;
+                    for (GList *l = sc->cycling_items; l != NULL; l = g_list_next(l)) {
+                        arenaitem = SP_ITEM(l->data)->get_arenaitem(desktop->dkey);
+                        nr_arena_item_set_opacity (arenaitem, 1.0);
+                    }
+                    g_list_free(sc->cycling_items);
+                    g_list_free(sc->cycling_items_selected_before);
+                    sc->cycling_items = NULL;
+                    sc->cycling_items_selected_before = NULL;
+                    sc->cycling_cur_item = NULL;
+                    sc->is_cycling = false;
+                }
             }
+
             }
             // set cursor to default.
-            gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
+            if (!desktop->isWaitingCursor()) {
+                gdk_window_set_cursor(GTK_WIDGET(sp_desktop_canvas(desktop))->window, event_context->cursor);
+            }
             break;
         default:
             break;