1 files changed, 137 insertions, 0 deletions
diff --git a/src/ui/widget/spinbutton.cpp b/src/ui/widget/spinbutton.cpp
new file mode 100644
index 0000000..c633035
--- /dev/null
+++ b/src/ui/widget/spinbutton.cpp
@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Author:
+ *   Johan B. C. Engelen
+ *
+ * Copyright (C) 2011 Author
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "spinbutton.h"
+#include "unit-menu.h"
+#include "unit-tracker.h"
+#include "util/expression-evaluator.h"
+#include "ui/tools/tool-base.h"
+
+namespace Inkscape {
+namespace UI {
+namespace Widget {
+
+
+void
+SpinButton::connect_signals() {
+    signal_input().connect(sigc::mem_fun(*this, &SpinButton::on_input));
+    signal_focus_in_event().connect(sigc::mem_fun(*this, &SpinButton::on_my_focus_in_event));
+    signal_key_press_event().connect(sigc::mem_fun(*this, &SpinButton::on_my_key_press_event));
+    gtk_widget_add_events(GTK_WIDGET(gobj()), GDK_SCROLL_MASK | GDK_SMOOTH_SCROLL_MASK);
+    signal_scroll_event().connect(sigc::mem_fun(*this, &SpinButton::on_scroll_event));
+    set_focus_on_click(true);
+};
+
+int SpinButton::on_input(double* newvalue)
+{
+    try {
+        Inkscape::Util::EvaluatorQuantity result;
+        if (_unit_menu || _unit_tracker) {
+            Unit const *unit = nullptr;
+            if (_unit_menu) {
+                unit = _unit_menu->getUnit();
+            } else {
+                unit = _unit_tracker->getActiveUnit();
+            }
+            Inkscape::Util::ExpressionEvaluator eval = Inkscape::Util::ExpressionEvaluator(get_text().c_str(), unit);
+            result = eval.evaluate();
+            // check if output dimension corresponds to input unit
+            if (result.dimension != (unit->isAbsolute() ? 1 : 0) ) {
+                throw Inkscape::Util::EvaluatorException("Input dimensions do not match with parameter dimensions.","");
+            }
+        } else {
+            Inkscape::Util::ExpressionEvaluator eval = Inkscape::Util::ExpressionEvaluator(get_text().c_str(), nullptr);
+            result = eval.evaluate();
+        }
+        *newvalue = result.value;
+    }
+    catch(Inkscape::Util::EvaluatorException &e) {
+        g_message ("%s", e.what());
+
+        return false;
+    }
+
+    return true;
+}
+
+bool SpinButton::on_my_focus_in_event(GdkEventFocus* /*event*/)
+{
+    _on_focus_in_value = get_value();
+    return false; // do not consume the event
+}
+
+
+
+bool SpinButton::on_scroll_event(GdkEventScroll *event)
+{
+    if (!is_focus()) {
+        return false;
+    }
+    double step, page;
+    get_increments(step, page);
+    if (event->state & GDK_CONTROL_MASK) {
+        step = page;
+    }
+    double change = 0.0;
+    if (event->direction == GDK_SCROLL_UP) {
+        change = step;
+    } else if (event->direction == GDK_SCROLL_DOWN) {
+        change = -step;
+    } else if (event->direction == GDK_SCROLL_SMOOTH) {
+        double delta_y_clamped = CLAMP(event->delta_y, -1, 1); // values > 1 result in excessive changes
+        change = step * -delta_y_clamped;
+    } else {
+        return false;
+    }
+    set_value(get_value() + change);
+    return true;
+}
+
+bool SpinButton::on_my_key_press_event(GdkEventKey* event)
+{
+    switch (Inkscape::UI::Tools::get_latin_keyval (event)) {
+    case GDK_KEY_Escape:
+        undo();
+        return true; // I consumed the event
+        break;
+    case GDK_KEY_z:
+    case GDK_KEY_Z:
+        if (event->state & GDK_CONTROL_MASK) {
+            undo();
+            return true; // I consumed the event
+        }
+        break;
+    default:
+        break;
+    }
+
+    return false; // do not consume the event
+}
+
+void SpinButton::undo()
+{
+    set_value(_on_focus_in_value);
+}
+
+
+} // namespace Widget
+} // 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 :