1 files changed, 135 insertions, 0 deletions
diff --git a/devtools/client/shared/test/browser_inplace-editor_maxwidth.js b/devtools/client/shared/test/browser_inplace-editor_maxwidth.js
new file mode 100644
index 0000000000..b48ddd6ddc
--- /dev/null
+++ b/devtools/client/shared/test/browser_inplace-editor_maxwidth.js
@@ -0,0 +1,135 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+/* import-globals-from helper_inplace_editor.js */
+
+"use strict";
+
+loadHelperScript("helper_inplace_editor.js");
+
+const MAX_WIDTH = 300;
+const START_TEXT = "Start text";
+const LONG_TEXT =
+  "I am a long text and I will not fit in a 300px container. " +
+  "I expect the inplace editor to wrap over more than two lines.";
+
+// Test the inplace-editor behavior with a maxWidth configuration option
+// defined.
+
+add_task(async function () {
+  await addTab("data:text/html;charset=utf-8,inplace editor max width tests");
+  const { host, doc } = await createHost();
+
+  info("Testing the maxWidth option in pixels, to precisely check the size");
+  await new Promise(resolve => {
+    createInplaceEditorAndClick(
+      {
+        multiline: true,
+        maxWidth: MAX_WIDTH,
+        start: testMaxWidth,
+        done: resolve,
+      },
+      doc,
+      START_TEXT
+    );
+  });
+
+  host.destroy();
+  gBrowser.removeCurrentTab();
+});
+
+const testMaxWidth = async function (editor) {
+  is(editor.input.value, START_TEXT, "Span text content should be used");
+  ok(
+    editor.input.offsetWidth < MAX_WIDTH,
+    "Input width should be strictly smaller than MAX_WIDTH"
+  );
+  is(getLines(editor.input), 1, "Input should display 1 line of text");
+
+  info("Check a text is on several lines if it does not fit MAX_WIDTH");
+  for (const key of LONG_TEXT) {
+    EventUtils.sendChar(key);
+    checkScrollbars(editor.input);
+  }
+
+  is(editor.input.value, LONG_TEXT, "Long text should be the input value");
+  is(
+    editor.input.offsetWidth,
+    MAX_WIDTH,
+    "Input width should be the same as MAX_WIDTH"
+  );
+  is(getLines(editor.input), 3, "Input should display 3 lines of text");
+  checkScrollbars(editor.input);
+
+  info("Delete all characters on line 3.");
+  while (getLines(editor.input) === 3) {
+    EventUtils.sendKey("BACK_SPACE");
+    checkScrollbars(editor.input);
+  }
+
+  is(
+    editor.input.offsetWidth,
+    MAX_WIDTH,
+    "Input width should be the same as MAX_WIDTH"
+  );
+  is(getLines(editor.input), 2, "Input should display 2 lines of text");
+  checkScrollbars(editor.input);
+
+  info("Delete all characters on line 2.");
+  while (getLines(editor.input) === 2) {
+    EventUtils.sendKey("BACK_SPACE");
+    checkScrollbars(editor.input);
+  }
+
+  is(getLines(editor.input), 1, "Input should display 1 line of text");
+  checkScrollbars(editor.input);
+
+  info("Delete all characters.");
+  while (editor.input.value !== "") {
+    EventUtils.sendKey("BACK_SPACE");
+    checkScrollbars(editor.input);
+  }
+
+  ok(
+    editor.input.offsetWidth < MAX_WIDTH,
+    "Input width should again be strictly smaller than MAX_WIDTH"
+  );
+  ok(
+    editor.input.offsetWidth > 0,
+    "Even with no content, the input has a non-zero width"
+  );
+  is(getLines(editor.input), 1, "Input should display 1 line of text");
+  checkScrollbars(editor.input);
+
+  info("Leave the inplace-editor");
+  EventUtils.sendKey("RETURN");
+};
+
+/**
+ * Retrieve the current number of lines displayed in the provided textarea.
+ *
+ * @param {DOMNode} textarea
+ * @return {Number} the number of lines
+ */
+function getLines(textarea) {
+  const win = textarea.ownerDocument.defaultView;
+  const style = win.getComputedStyle(textarea);
+  return Math.floor(textarea.clientHeight / parseFloat(style.fontSize));
+}
+
+/**
+ * Verify that the provided textarea has no vertical or horizontal scrollbar.
+ *
+ * @param {DOMNode} textarea
+ */
+function checkScrollbars(textarea) {
+  is(
+    textarea.scrollHeight,
+    textarea.clientHeight,
+    "Textarea should never have vertical scrollbars"
+  );
+  is(
+    textarea.scrollWidth,
+    textarea.clientWidth,
+    "Textarea should never have horizontal scrollbars"
+  );
+}