1 files changed, 158 insertions, 0 deletions
diff --git a/src/display/control/canvas-item-group.cpp b/src/display/control/canvas-item-group.cpp
new file mode 100644
index 0000000..8e53857
--- /dev/null
+++ b/src/display/control/canvas-item-group.cpp
@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * A CanvasItem that contains other CanvasItem's.
+ */
+
+/*
+ * Author:
+ *   Tavmjong Bah
+ *
+ * Copyright (C) 2020 Tavmjong Bah
+ *
+ * Rewrite of SPCanvasGroup
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "canvas-item-group.h"
+#include "canvas-item-ctrl.h"  // Update sizes
+
+namespace Inkscape {
+
+CanvasItemGroup::CanvasItemGroup(CanvasItemGroup *group)
+    : CanvasItem(group)
+{
+    _name = "CanvasItemGroup";
+    _pickable = true; // For now all groups are pickable... look into turning this off for some groups (e.g. temp).
+}
+
+CanvasItemGroup::~CanvasItemGroup()
+{
+    while (!items.empty()) {
+        CanvasItem & item = items.front();
+        remove(&item);
+    }
+
+    if (_parent) {
+        _parent->remove(this, false); // remove() should not delete this or we'll double delete!
+    }
+}
+
+void CanvasItemGroup::add(CanvasItem *item)
+{
+#ifdef CANVAS_ITEM_DEBUG
+    std::cout << "CanvasItemGroup::add: " << item->get_name() << " to " << _name << " " << items.size() << std::endl;
+#endif
+    items.push_back(*item);
+    // canvas request update
+}
+
+void CanvasItemGroup::remove(CanvasItem *item, bool Delete)
+{
+#ifdef CANVAS_ITEM_DEBUG
+    std::cout << "CanvasItemGroup::remove: " << item->get_name() << " from " << _name << " " << items.size() << std::endl;
+#endif
+    auto position = items.iterator_to(*item);
+    if (position != items.end()) {
+        position->set_parent(nullptr);
+        items.erase(position);
+        if (Delete) {
+            delete (&*position);  // An item directly deleted should not be deleted here.
+        }
+    }
+}
+
+void CanvasItemGroup::update(Geom::Affine const &affine)
+{
+    if (_affine == affine && !_need_update) {
+        // Nothing to do.
+        return;
+    }
+
+    _affine = affine;
+    _need_update = false;
+
+    _bounds = Geom::Rect();  // Zero
+
+    // Update all children and calculate new bounds.
+    for (auto & item : items) {
+        // We don't need to update what is not visible
+        if (!item.is_visible()) continue;
+        item.update(_affine);
+        _bounds.unionWith(item.get_bounds());
+    }
+}
+
+void CanvasItemGroup::render(Inkscape::CanvasItemBuffer *buf)
+{
+    if (_visible) {
+        if (_bounds.interiorIntersects(buf->rect)) {
+            for (auto & item : items) {
+                item.render(buf);
+            }
+         }
+    }
+}
+
+// Return last visible and pickable item that contains point.
+// SPCanvasGroup returned distance but it was not used.
+CanvasItem* CanvasItemGroup::pick_item(Geom::Point& p)
+{
+#ifdef CANVAS_ITEM_DEBUG
+    std::cout << "CanvasItemGroup::pick_item:" << std::endl;
+    std::cout << "  PICKING: In group: " << _name << "  bounds: " << _bounds << std::endl;
+#endif
+    for (auto item = items.rbegin(); item != items.rend(); ++item) { // C++20 will allow us to loop in reverse.
+#ifdef CANVAS_ITEM_DEBUG
+        std::cout << "    PICKING: Checking: " << item->get_name() << "  bounds: " << item->get_bounds() << std::endl;
+#endif
+        CanvasItem* picked_item = nullptr;
+        if (item->is_visible()   &&
+            item->is_pickable()  &&
+            item->contains(p)    ) {
+
+            auto group = dynamic_cast<CanvasItemGroup *>(&*item);
+            if (group) {
+                picked_item = group->pick_item(p);
+            } else {
+                picked_item = &*item;
+            }
+        }
+
+        if (picked_item != nullptr) {
+#ifdef CANVAS_ITEM_DEBUG
+            std::cout << "  PICKING: pick_item: " << picked_item->get_name() << std::endl;
+#endif
+            return picked_item;
+        }
+    }
+
+    return nullptr;   
+}
+
+void CanvasItemGroup::update_canvas_item_ctrl_sizes(int size_index)
+{
+    for (auto & item : items) {
+        auto ctrl = dynamic_cast<CanvasItemCtrl *>(&item);
+        if (ctrl) {
+            // We can't use set_size_default as the preference file is updated ->after<- the signal is emitted!
+            ctrl->set_size_via_index(size_index);
+        }
+        auto group = dynamic_cast<CanvasItemGroup *>(&item);
+        if (group) {
+            group->update_canvas_item_ctrl_sizes(size_index);
+        }
+    }
+}
+
+} // 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 :