refactor layout.h into single file per Node* classes

engine/node_panel_stroke.cpp

@@ -0,0 +1,52 @@
+#include "pch.h"
+#include "log.h"
+#include "node_panel_stroke.h"
+
+Node* NodePanelStroke::clone_instantiate() const
+{
+    return new NodePanelStroke();
+}
+
+void NodePanelStroke::clone_finalize(Node* dest) const
+{
+    NodePanelStroke* n = static_cast<NodePanelStroke*>(dest);
+    n->init_controls();
+}
+
+void NodePanelStroke::init()
+{
+    init_template("tpl-panel-stroke");
+    init_controls();
+}
+
+void NodePanelStroke::init_controls()
+{
+    m_canvas = find<NodeStrokePreview>("canvas");
+
+    init_slider(m_tip_size, "tip-size", &ui::Brush::m_tip_size);
+    init_slider(m_tip_spacing, "tip-spacing", &ui::Brush::m_tip_spacing);
+    init_slider(m_tip_flow, "tip-flow", &ui::Brush::m_tip_flow);
+    init_slider(m_tip_opacity, "tip-opacity", &ui::Brush::m_tip_opacity);
+    init_slider(m_tip_angle, "tip-angle", &ui::Brush::m_tip_angle);
+    init_slider(m_jitter_scale, "jitter-scale", &ui::Brush::m_jitter_scale);
+    init_slider(m_jitter_angle, "jitter-angle", &ui::Brush::m_jitter_angle);
+    init_slider(m_jitter_spread, "jitter-spread", &ui::Brush::m_jitter_spread);
+    init_slider(m_jitter_flow, "jitter-flow", &ui::Brush::m_jitter_flow);
+    //m_canvas->draw_stroke();
+}
+
+void NodePanelStroke::init_slider(NodeSliderH*& slider, const char* id, float ui::Brush::* prop)
+{
+    slider = find<NodeSliderH>(id);
+    slider->on_value_changed = std::bind(&NodePanelStroke::handle_slide,
+        this, prop, std::placeholders::_1, std::placeholders::_2);
+    m_canvas->m_brush.*prop = slider->m_value.x;
+}
+
+void NodePanelStroke::handle_slide(float ui::Brush::* prop, Node* target, float value)
+{
+    m_canvas->m_brush.*prop = value;
+    m_canvas->draw_stroke();
+    if (on_stroke_change)
+        on_stroke_change(this);
+}