[pdm-devel] [PATCH proxmox-yew-widget-toolkit v2 1/1] data table: add get_property helper for displaying optional values

[Stefan Hanreich]

In some cases, particularly for tree views, it might make sense to not
show values for some cells. In order to simplify handling optional
values, add two get_property helpers that can work with optional
values. It renders the values if it exists and nothing otherwise.
Since Option implements Ord, the widget can use its Ord implementation
for sorting. The current helpers cannot be used, since Option does not
implement Display, so the trait bounds are not satisfied. Analogous to
the existing helpers, add one for owned values and one for references.

Signed-off-by: Stefan Hanreich <s.hanreich at proxmox.com>
---

Notes:
    Changes from v1:
    * add helper for owned values as well

 src/widget/data_table/column.rs | 36 ++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/src/widget/data_table/column.rs b/src/widget/data_table/column.rs
index 016be99..6cd8e1b 100644
--- a/src/widget/data_table/column.rs
+++ b/src/widget/data_table/column.rs
@@ -5,7 +5,7 @@ use derivative::Derivative;
 use yew::html::IntoPropValue;
 use yew::prelude::*;
 
-use yew::virtual_dom::Key;
+use yew::virtual_dom::{Key, VNode};
 
 use crate::props::{CallbackMut, IntoEventCallbackMut, IntoSorterFn, RenderFn, SorterFn};
 use crate::state::TreeStore;
@@ -328,6 +328,40 @@ impl<T: 'static> DataTableColumn<T> {
         .render(move |item: &T| html! {{get_property_fn(item)}})
     }
 
+    /// Builder style method to set a get_property_fn for renderer and sorter
+    /// the given fn must return the value as an Option containing a reference.
+    pub fn get_property_optional<E: Ord + std::fmt::Display>(
+        self,
+        get_property_fn: impl 'static + Fn(&T) -> Option<&E>,
+    ) -> Self {
+        let get_property_fn = Rc::new(get_property_fn);
+        self.sorter({
+            let get_property_fn = get_property_fn.clone();
+            move |itema: &T, itemb: &T| get_property_fn(itema).cmp(&get_property_fn(itemb))
+        })
+        .render(
+            move |item: &T| html! {{get_property_fn(item).map(VNode::from).unwrap_or_default()}},
+        )
+    }
+
+    /// Builder style method to set a get_property_fn for renderer and sorter
+    /// the given fn must return the value as an Option containing an owned value.
+    /// NOTE: on sort this will be called multiple times per entry, so use with caution for large
+    /// lists.
+    pub fn get_property_optional_owned<E: Ord + std::fmt::Display>(
+        self,
+        get_property_fn: impl 'static + Fn(&T) -> Option<E>,
+    ) -> Self {
+        let get_property_fn = Rc::new(get_property_fn);
+        self.sorter({
+            let get_property_fn = get_property_fn.clone();
+            move |itema: &T, itemb: &T| get_property_fn(itema).cmp(&get_property_fn(itemb))
+        })
+        .render(
+            move |item: &T| html! {{get_property_fn(item).map(VNode::from).unwrap_or_default()}},
+        )
+    }
+
     /// Builder style method for [`Self::set_tree_column`]
     pub fn tree_column(mut self, store: impl IntoPropValue<Option<TreeStore<T>>>) -> Self {
         self.set_tree_column(store);
-- 
2.47.2