1 files changed, 87 insertions, 0 deletions
diff --git a/devtools/client/inspector/fonts/components/FontSize.js b/devtools/client/inspector/fonts/components/FontSize.js
new file mode 100644
index 0000000000..dbb67a66d9
--- /dev/null
+++ b/devtools/client/inspector/fonts/components/FontSize.js
@@ -0,0 +1,87 @@
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const {
+  createFactory,
+  PureComponent,
+} = require("resource://devtools/client/shared/vendor/react.js");
+const PropTypes = require("resource://devtools/client/shared/vendor/react-prop-types.js");
+
+const FontPropertyValue = createFactory(
+  require("resource://devtools/client/inspector/fonts/components/FontPropertyValue.js")
+);
+
+const {
+  getStr,
+} = require("resource://devtools/client/inspector/fonts/utils/l10n.js");
+const {
+  getUnitFromValue,
+  getStepForUnit,
+} = require("resource://devtools/client/inspector/fonts/utils/font-utils.js");
+
+class FontSize extends PureComponent {
+  static get propTypes() {
+    return {
+      disabled: PropTypes.bool.isRequired,
+      onChange: PropTypes.func.isRequired,
+      value: PropTypes.string.isRequired,
+    };
+  }
+
+  constructor(props) {
+    super(props);
+    this.historicMax = {};
+  }
+
+  render() {
+    const value = parseFloat(this.props.value);
+    const unit = getUnitFromValue(this.props.value);
+    let max;
+    switch (unit) {
+      case "em":
+      case "rem":
+        max = 4;
+        break;
+      case "vh":
+      case "vw":
+      case "vmin":
+      case "vmax":
+        max = 10;
+        break;
+      case "%":
+        max = 200;
+        break;
+      default:
+        max = 72;
+        break;
+    }
+
+    // Allow the upper bound to increase so it accomodates the out-of-bounds value.
+    max = Math.max(max, value);
+    // Ensure we store the max value ever reached for this unit type. This will be the
+    // max value of the input and slider. Without this memoization, the value and slider
+    // thumb get clamped at the upper bound while decrementing an out-of-bounds value.
+    this.historicMax[unit] = this.historicMax[unit]
+      ? Math.max(this.historicMax[unit], max)
+      : max;
+
+    return FontPropertyValue({
+      allowOverflow: true,
+      disabled: this.props.disabled,
+      label: getStr("fontinspector.fontSizeLabel"),
+      min: 0,
+      max: this.historicMax[unit],
+      name: "font-size",
+      onChange: this.props.onChange,
+      step: getStepForUnit(unit),
+      unit,
+      unitOptions: ["em", "rem", "%", "px", "vh", "vw"],
+      value,
+    });
+  }
+}
+
+module.exports = FontSize;