Temporary implementation of Canvas.MeasureText

components/script/dom/textmetrics.rs

@@ -0,0 +1,158 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use crate::dom::bindings::codegen::Bindings::TextMetricsBinding;
+use crate::dom::bindings::codegen::Bindings::TextMetricsBinding::TextMetricsMethods;
+use crate::dom::bindings::num::Finite;
+use crate::dom::bindings::reflector::{reflect_dom_object, Reflector};
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::globalscope::GlobalScope;
+use dom_struct::dom_struct;
+
+#[dom_struct]
+pub struct TextMetrics {
+    reflector_: Reflector,
+    width: Finite<f64>,
+    actualBoundingBoxLeft: Finite<f64>,
+    actualBoundingBoxRight: Finite<f64>,
+    fontBoundingBoxAscent: Finite<f64>,
+    fontBoundingBoxDescent: Finite<f64>,
+    actualBoundingBoxAscent: Finite<f64>,
+    actualBoundingBoxDescent: Finite<f64>,
+    emHeightAscent: Finite<f64>,
+    emHeightDescent: Finite<f64>,
+    hangingBaseline: Finite<f64>,
+    alphabeticBaseline: Finite<f64>,
+    ideographicBaseline: Finite<f64>,
+}
+
+impl TextMetrics {
+    fn new_inherited(
+        width: f64,
+        actualBoundingBoxLeft: f64,
+        actualBoundingBoxRight: f64,
+        fontBoundingBoxAscent: f64,
+        fontBoundingBoxDescent: f64,
+        actualBoundingBoxAscent: f64,
+        actualBoundingBoxDescent: f64,
+        emHeightAscent: f64,
+        emHeightDescent: f64,
+        hangingBaseline: f64,
+        alphabeticBaseline: f64,
+        ideographicBaseline: f64,
+    ) -> TextMetrics {
+        TextMetrics {
+            reflector_: Reflector::new(),
+            width: Finite::wrap(width),
+            actualBoundingBoxLeft: Finite::wrap(actualBoundingBoxLeft),
+            actualBoundingBoxRight: Finite::wrap(actualBoundingBoxRight),
+            fontBoundingBoxAscent: Finite::wrap(fontBoundingBoxAscent),
+            fontBoundingBoxDescent: Finite::wrap(fontBoundingBoxDescent),
+            actualBoundingBoxAscent: Finite::wrap(actualBoundingBoxAscent),
+            actualBoundingBoxDescent: Finite::wrap(actualBoundingBoxDescent),
+            emHeightAscent: Finite::wrap(emHeightAscent),
+            emHeightDescent: Finite::wrap(emHeightDescent),
+            hangingBaseline: Finite::wrap(hangingBaseline),
+            alphabeticBaseline: Finite::wrap(alphabeticBaseline),
+            ideographicBaseline: Finite::wrap(ideographicBaseline),
+        }
+    }
+
+    pub fn new(
+        global: &GlobalScope,
+        width: f64,
+        actualBoundingBoxLeft: f64,
+        actualBoundingBoxRight: f64,
+        fontBoundingBoxAscent: f64,
+        fontBoundingBoxDescent: f64,
+        actualBoundingBoxAscent: f64,
+        actualBoundingBoxDescent: f64,
+        emHeightAscent: f64,
+        emHeightDescent: f64,
+        hangingBaseline: f64,
+        alphabeticBaseline: f64,
+        ideographicBaseline: f64,
+    ) -> DomRoot<TextMetrics> {
+        reflect_dom_object(
+            Box::new(TextMetrics::new_inherited(
+                width,
+                actualBoundingBoxLeft,
+                actualBoundingBoxRight,
+                fontBoundingBoxAscent,
+                fontBoundingBoxDescent,
+                actualBoundingBoxAscent,
+                actualBoundingBoxDescent,
+                emHeightAscent,
+                emHeightDescent,
+                hangingBaseline,
+                alphabeticBaseline,
+                ideographicBaseline,
+            )),
+            global,
+            TextMetricsBinding::Wrap,
+        )
+    }
+}
+
+impl TextMetricsMethods for TextMetrics {
+    /// https://html.spec.whatwg.org/multipage/#dom-textmetrics-width
+    fn Width(&self) -> Finite<f64> {
+        self.width
+    }
+
+    /// https://html.spec.whatwg.org/multipage/#dom-textmetrics-actualboundingboxleft
+    fn ActualBoundingBoxLeft(&self) -> Finite<f64> {
+        self.actualBoundingBoxLeft
+    }
+
+    /// https://html.spec.whatwg.org/multipage/#dom-textmetrics-actualboundingboxright
+    fn ActualBoundingBoxRight(&self) -> Finite<f64> {
+        self.actualBoundingBoxRight
+    }
+
+    /// https://html.spec.whatwg.org/multipage/#dom-textmetrics-fontboundingboxascent
+    fn FontBoundingBoxAscent(&self) -> Finite<f64> {
+        self.fontBoundingBoxAscent
+    }
+
+    /// https://html.spec.whatwg.org/multipage/#dom-textmetrics-fontboundingboxascent
+    fn FontBoundingBoxDescent(&self) -> Finite<f64> {
+        self.fontBoundingBoxDescent
+    }
+
+    /// https://html.spec.whatwg.org/multipage/#dom-textmetrics-actualboundingboxascent
+    fn ActualBoundingBoxAscent(&self) -> Finite<f64> {
+        self.actualBoundingBoxAscent
+    }
+
+    /// https://html.spec.whatwg.org/multipage/#dom-textmetrics-actualboundingboxdescent
+    fn ActualBoundingBoxDescent(&self) -> Finite<f64> {
+        self.actualBoundingBoxDescent
+    }
+
+    /// https://html.spec.whatwg.org/multipage/#dom-textmetrics-emheightascent
+    fn EmHeightAscent(&self) -> Finite<f64> {
+        self.emHeightAscent
+    }
+
+    /// https://html.spec.whatwg.org/multipage/#dom-textmetrics-emheightdescent
+    fn EmHeightDescent(&self) -> Finite<f64> {
+        self.emHeightDescent
+    }
+
+    /// https://html.spec.whatwg.org/multipage/#dom-textmetrics-hangingbaseline
+    fn HangingBaseline(&self) -> Finite<f64> {
+        self.hangingBaseline
+    }
+
+    /// https://html.spec.whatwg.org/multipage/#dom-textmetrics-alphabeticbaseline
+    fn AlphabeticBaseline(&self) -> Finite<f64> {
+        self.alphabeticBaseline
+    }
+
+    /// https://html.spec.whatwg.org/multipage/#dom-textmetrics-ideographicbaseline
+    fn IdeographicBaseline(&self) -> Finite<f64> {
+        self.ideographicBaseline
+    }
+}