diff -r 000000000000 -r 804d8803eade ui/common/document.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/common/document.c	Wed Dec 09 11:32:01 2020 +0100
@@ -0,0 +1,102 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "document.h"
+
+static UcxMap *documents;
+
+void uic_docmgr_init() {
+    documents = ucx_map_new(32);
+}
+
+void ui_set_document(UiObject *obj, void *document) {
+    uic_context_detach_all(obj->ctx);
+    obj->ctx->attach_document(obj->ctx, document);
+}
+
+void ui_detach_document(UiObject *obj) {
+    uic_context_detach_all(obj->ctx);
+}
+
+void* ui_get_document(UiObject *obj) {
+    return obj->ctx->document;
+}
+
+void ui_set_subdocument(void *document, void *sub) {
+    UiContext *ctx = ui_document_context(document);
+    if(!ctx) {
+        fprintf(stderr, "UI Error: pointer is not a document\n");
+    }
+    // TODO
+}
+
+void ui_detach_subdocument(void *document, void *sub) {
+    UiContext *ctx = ui_document_context(document);
+    if(!ctx) {
+        fprintf(stderr, "UI Error: pointer is not a document\n");
+    }
+    // TODO
+}
+
+void* ui_get_subdocument(void *document) {
+    UiContext *ctx = ui_document_context(document);
+    if(!ctx) {
+        fprintf(stderr, "UI Error: pointer is not a document\n");
+    }
+    // TODO
+    return NULL;
+}
+
+void* ui_document_new(size_t size) {
+    UcxMempool *mp = ucx_mempool_new(256);
+    UiContext *ctx = ucx_mempool_calloc(mp, 1, sizeof(UiContext));
+    ctx->attach_document = uic_context_attach_document;
+    ctx->detach_document2 = uic_context_detach_document2;
+    ctx->mempool = mp;
+    ctx->vars = ucx_map_new_a(mp->allocator, 16);
+    
+    void *document = ucx_mempool_calloc(mp, 1, size);
+    ucx_map_put(documents, ucx_key(&document, sizeof(void*)), ctx);
+    return document;
+}
+
+void ui_document_destroy(void *doc) {
+    // TODO
+}
+
+UiContext* ui_document_context(void *doc) {
+    if(doc) {
+        return ucx_map_get(documents, ucx_key(&doc, sizeof(void*)));
+    } else {
+        return NULL;
+    }
+}