refactor layout.h into single file per Node* classes

engine/node_dialog_open.cpp

@@ -0,0 +1,41 @@
+#include "pch.h"
+#include "log.h"
+#include "node_dialog_open.h"
+#include "canvas.h"
+#include "node_image_texture.h"
+
+Node* NodeDialogOpen::clone_instantiate() const
+{
+    return new NodeDialogOpen();
+}
+
+void NodeDialogOpen::clone_finalize(Node* dest) const
+{
+    NodeDialogOpen* n = static_cast<NodeDialogOpen*>(dest);
+    n->init_controls();
+}
+
+void NodeDialogOpen::init()
+{
+    auto tpl = static_cast<const NodeBorder*>(init_template("dialog-open"));
+    m_color = tpl->m_color;
+    m_border_color = tpl->m_border_color;;
+    m_thinkness = tpl->m_thinkness;;
+    init_controls();
+}
+
+void NodeDialogOpen::init_controls()
+{
+    btn_ok = find<NodeButton>("btn-ok");
+    btn_cancel = find<NodeButton>("btn-cancel");
+    btn_cancel->on_click = [this](Node*) {
+        destroy();
+    };
+}
+
+void NodeDialogOpen::loaded()
+{
+    ui::Image thumb = ui::Canvas::I->thumbnail_read(data_path);
+    auto image_tex = find<NodeImageTexture>("thumb-tex");
+    image_tex->tex.create(thumb);
+}