create NodeDialogOpen and bind it to the layout template

engine/layout.h

@@ -1898,6 +1898,42 @@ public:
     }
 };
 
+class NodeDialogOpen : public NodeBorder
+{
+public:
+    NodeButton* btn_cancel;
+    NodeButton* btn_ok;
+    std::string data_path;
+    virtual Node* clone_instantiate() const override { return new NodeDialogOpen(); }
+    virtual void clone_finalize(Node* dest) const override
+    {
+        NodeDialogOpen* n = static_cast<NodeDialogOpen*>(dest);
+        n->init_controls();
+    }
+    virtual void init() override
+    {
+        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 init_controls()
+    {
+        btn_ok = find<NodeButton>("btn-ok");
+        btn_cancel = find<NodeButton>("btn-cancel");
+        btn_cancel->on_click = [this](Node*) {
+            destroy();
+        };
+    }
+    virtual void loaded() override
+    {
+        ui::Image thumb = ui::Canvas::I->thumbnail_read(data_path);
+        auto image_tex = find<NodeImageTexture>("thumb-tex");
+        image_tex->tex.create(thumb);
+    }
+};
+
 class NodeCanvas : public Node
 {
     bool m_dragging = false;