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Add method to create a "this" expression from GObject types #710

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Dec 14, 2021
Merged

Add method to create a "this" expression from GObject types #710

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11 changes: 6 additions & 5 deletions examples/expressions/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -36,19 +36,20 @@ fn build_ui(app: &gtk::Application) {

// Instead of binding properties and manually unbinding them, you can create expressions.
// The value can be obtained even if it is several steps away.
let metadata_expression = list_item
list_item
.property_expression("item")
.chain_property::<Note>("metadata");

metadata_expression
.chain_property::<Note>("metadata")
.chain_property::<Metadata>("title")
.chain_closure_with_callback(|args| {
let title: String = args[1].get().unwrap();
format!("Title: {}", title)
})
.bind(&title_label, "label", gtk::Widget::NONE);

metadata_expression
// Property expressions can also start from the `this` value, which is set as the last
// argument to the `bind` function.
gtk::ListItem::this_expression("item")
.chain_property::<Note>("metadata")
.chain_property::<Metadata>("last-modified")
.chain_closure::<String>(closure!(
|_: gtk::ListItem, last_modified: glib::DateTime| {
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9 changes: 9 additions & 0 deletions gtk4/src/expression.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -277,6 +277,10 @@ pub trait GObjectPropertyExpressionExt {
// rustdoc-stripper-ignore-next
/// Create an expression looking up an object's property with a weak reference.
fn property_expression_weak(&self, property_name: &str) -> crate::PropertyExpression;

// rustdoc-stripper-ignore-next
/// Create an expression looking up a property in the bound `this` object.
fn this_expression(property_name: &str) -> crate::PropertyExpression;
}

impl<T: IsA<glib::Object>> GObjectPropertyExpressionExt for T {
Expand All @@ -289,6 +293,11 @@ impl<T: IsA<glib::Object>> GObjectPropertyExpressionExt for T {
let obj_expr = crate::ObjectExpression::new(self);
crate::PropertyExpression::new(T::static_type(), Some(&obj_expr), property_name)
}

fn this_expression(property_name: &str) -> crate::PropertyExpression {
skip_assert_initialized!();
crate::PropertyExpression::new(T::static_type(), Expression::NONE, property_name)
}
}

macro_rules! define_expression {
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