1 files changed, 153 insertions, 0 deletions
diff --git a/src/ui/tool/selector.cpp b/src/ui/tool/selector.cpp
new file mode 100644
index 0000000..5b2fd45
--- /dev/null
+++ b/src/ui/tool/selector.cpp
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Selector component (click and rubberband)
+ */
+/* 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 <gdk/gdkkeysyms.h>
+
+#include "control-point.h"
+#include "desktop.h"
+
+#include "display/control/canvas-item-rect.h"
+
+#include "ui/tools/tool-base.h"
+#include "ui/tool/event-utils.h"
+#include "ui/tool/selector.h"
+
+namespace Inkscape {
+namespace UI {
+
+/** A hidden control point used for rubberbanding and selection.
+ * It uses a clever hack: the canvas item is hidden and only receives events when they
+ * are passed to it using Selector's event() function. When left mouse button
+ * is pressed, it grabs events and handles drags and clicks in the usual way. */
+class SelectorPoint : public ControlPoint {
+public:
+    SelectorPoint(SPDesktop *d, Inkscape::CanvasItemGroup *group, Selector *s) :
+        ControlPoint(d, Geom::Point(0,0), SP_ANCHOR_CENTER,
+                     Inkscape::CANVAS_ITEM_CTRL_TYPE_INVISIPOINT,
+                     invisible_cset, group),
+        _selector(s),
+        _cancel(false)
+    {
+        _canvas_item_ctrl->set_name("CanvasItemCtrl:SelectorPoint");
+        setVisible(false);
+        _rubber = new Inkscape::CanvasItemRect(_desktop->getCanvasControls());
+        _rubber->set_name("CanavasItemRect:SelectorPoint:Rubberband");
+        _rubber->set_stroke(0x8080ffff);
+        _rubber->set_inverted(true);
+        _rubber->hide();
+   }
+
+    ~SelectorPoint() override {
+        delete _rubber;
+    }
+
+    SPDesktop *desktop() { return _desktop; }
+
+    bool event(Inkscape::UI::Tools::ToolBase *ec, GdkEvent *e) {
+        return _eventHandler(ec, e);
+    }
+
+protected:
+    bool _eventHandler(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event) override {
+        if (event->type == GDK_KEY_PRESS               &&
+            shortcut_key(event->key) == GDK_KEY_Escape &&
+            _rubber->is_visible()                       )
+        {
+            _cancel = true;
+            _rubber->hide();
+            return true;
+        }
+        return ControlPoint::_eventHandler(event_context, event);
+    }
+
+private:
+    bool grabbed(GdkEventMotion *) override {
+        _cancel = false;
+        _start = position();
+        _rubber->show();
+        return false;
+    }
+
+    void dragged(Geom::Point &new_pos, GdkEventMotion *) override {
+        if (_cancel) return;
+        Geom::Rect sel(_start, new_pos);
+        _rubber->set_rect(sel);
+    }
+
+    void ungrabbed(GdkEventButton *event) override {
+        if (_cancel) return;
+        _rubber->hide();
+        Geom::Rect sel(_start, position());
+        _selector->signal_area.emit(sel, event);
+    }
+
+    bool clicked(GdkEventButton *event) override {
+        if (event->button != 1) return false;
+        _selector->signal_point.emit(position(), event);
+        return true;
+    }
+
+    Inkscape::CanvasItemRect *_rubber;
+    Selector *_selector;
+    Geom::Point _start;
+    bool _cancel;
+};
+
+
+Selector::Selector(SPDesktop *desktop)
+    : Manipulator(desktop)
+    , _dragger(new SelectorPoint(desktop, desktop->getCanvasControls(), this))
+{
+    _dragger->setVisible(false);
+}
+
+Selector::~Selector()
+{
+    delete _dragger;
+}
+
+bool Selector::event(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event)
+{
+    // The hidden control point will capture all events after it obtains the grab,
+    // but it relies on this function to initiate it. If we pass only first button
+    // press events here, it won't interfere with any other event handling.
+    switch (event->type) {
+    case GDK_BUTTON_PRESS:
+        // Do not pass button presses other than left button to the control point.
+        // This way middle click and right click can be handled in ToolBase.
+        if (event->button.button == 1 && !event_context->is_space_panning()) {
+            _dragger->setPosition(_desktop->w2d(event_point(event->motion)));
+            return _dragger->event(event_context, event);
+        }
+        break;
+    default: break;
+    }
+    return false;
+}
+
+bool Selector::doubleClicked() {
+    return _dragger->doubleClicked();
+}
+
+} // 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 :