work on UI components

This commit introduces some HTML and javascript (and tests for it) to use in constructing the new UI. This is partial work that is not yet finished.

1 files changed, 189 insertions, 0 deletions

diff --git a/html/item_list.js b/html/item_list.js
new file mode 100644
index 0000000..f6b9bd3
--- /dev/null
+++ b/html/item_list.js
@@ -0,0 +1,189 @@
+/**
+ * This file is part of Haketilo.
+ *
+ * Function: Showing a list of resources/mappings in a browser.
+ *
+ * Copyright (C) 2022 Wojtek Kosior
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * As additional permission under GNU GPL version 3 section 7, you
+ * may distribute forms of that code without the copy of the GNU
+ * GPL normally required by section 4, provided you include this
+ * license notice and, in case of non-source distribution, a URL
+ * through which recipients can access the Corresponding Source.
+ * If you modify file(s) with this exception, you may extend this
+ * exception to your version of the file(s), but you are not
+ * obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ *
+ * As a special exception to the GPL, any HTML file which merely
+ * makes function calls to this code, and for that purpose
+ * includes it by reference shall be deemed a separate work for
+ * copyright law purposes. If you modify this code, you may extend
+ * this exception to your version of the code, but you are not
+ * obligated to do so. If you do not wish to do so, delete this
+ * exception statement from your version.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * I, Wojtek Kosior, thereby promise not to sue for violation of this file's
+ * license. Although I request that you do not make use of this code in a
+ * proprietary program, I am not going to enforce this in court.
+ */
+
+#IMPORT common/indexeddb.js AS haketilodb
+#IMPORT html/dialog.js
+
+#FROM html/item_preview.js IMPORT resource_preview, mapping_preview
+#FROM html/DOM_helpers.js IMPORT clone_template
+
+function preview_item(list_ctx, item, ignore_dialog=false)
+{
+    if (list_ctx.dialog_ctx.shown && !ignore_dialog)
+	return;
+
+    list_ctx.preview_ctx =
+	list_ctx.preview_cb(item.definition, list_ctx.preview_ctx);
+    list_ctx.preview_container
+	.prepend(list_ctx.preview_ctx.main_div);
+
+    if (list_ctx.previewed_item !== null)
+	list_ctx.previewed_item.li.classList.remove("item_li_highlight");
+
+    list_ctx.previewed_item = item;
+    item.li.classList.add("item_li_highlight");
+
+    list_ctx.preview_container.classList.remove("hide");
+}
+
+function insert_item(list_ctx, definition, idx)
+{
+    const li = document.createElement("li");
+    li.innerText = definition.long_name;
+    if (idx)
+	list_ctx.items[idx - 1].li.after(li);
+    else
+	list_ctx.ul.prepend(li);
+
+    const item = {definition, li};
+    list_ctx.items.splice(idx, 0, item);
+    list_ctx.by_identifier.set(definition.identifier, item);
+
+    li.addEventListener("click", () => preview_item(list_ctx, item));
+
+    return item;
+}
+
+const coll = new Intl.Collator();
+
+function item_cmp(def1, def2)
+{
+    return coll.compare(def1.long_name, def2.long_name) ||
+	coll.compare(def1.identifier, def2.identifier);
+}
+
+function find_item_idx(definition)
+{
+    /* Perform a binary search of item's (new or not) index in sorted array. */
+    let left = 0, right = list_ctx.items.length;
+
+    while (left < right) {
+	const mid = (left + right) >> 1;
+	if (item_cmp(definition, list_ctx.items[mid].definition) > 0)
+	    left = mid + 1;
+	else /* <= 0 */
+	    right = mid;
+    }
+
+    return left;
+}
+
+function item_changed(list_ctx, change)
+{
+
+    /* Remove item. */
+    const old_item = list_ctx.by_identifier.get(change.key);
+    if (old_item !== undefined) {
+	list_ctx.items.splice(find_item_idx(old_item.definition), 1);
+	list_ctx.by_identifier.delete(change.key);
+	old_item.li.remove();
+
+	if (list_ctx.previewed_item === old_item) {
+	    list_ctx.preview_container.classList.add("hide");
+	    list_ctx.previewed_item = null;
+	}
+    }
+
+    if (change.new_val === undefined)
+	return;
+
+    const new_item = insert_item(list_ctx, change.new_val,
+				 find_item_idx(change.new_val));
+    if (list_ctx.previewed_item === old_item)
+	preview_item(list_ctx, new_item, true);
+}
+
+async function item_list(preview_cb, track_cb)
+{
+    const list_ctx = clone_template("item_list");
+
+    const [tracking, definitions] =
+	  await track_cb(ch => item_changed(list_ctx, ch));
+
+    definitions.sort(item_cmp);
+
+    Object.assign(list_ctx, {
+	items: [],
+	by_identifier: new Map(),
+	tracking,
+	previewed_item: null,
+	preview_cb,
+	dialog_ctx: dialog.make(() => on_dialog_show(list_ctx),
+				() => on_dialog_hide(list_ctx))
+    });
+    list_ctx.dialog_container.append(list_ctx.dialog_ctx.main_div);
+
+    for (const def of definitions)
+	insert_item(list_ctx, def, list_ctx.items.length);
+
+    return list_ctx;
+}
+
+function on_dialog_show(list_ctx)
+{
+    list_ctx.ul;
+    list_ctx.preview_container.classList.add("hide");
+    list_ctx.dialog_container.classList.remove("hide");
+}
+
+function on_dialog_hide(list_ctx)
+{
+    list_ctx.ul;
+    list_ctx.preview_container.classList.remove("hide");
+    list_ctx.dialog_container.classList.add("hide");
+}
+
+const resource_list =
+      () => item_list(resource_preview, haketilodb.track.resources);
+#EXPORT resource_list
+
+const mapping_list =
+      () => item_list(mapping_preview, haketilodb.track.mappings);
+#EXPORT mapping_list
+
+function destroy_list(list_ctx)
+{
+    haketilodb.untrack(list_ctx.tracking);
+    list_ctx.main_div.remove();
+}
+#EXPORT destroy_list