From 8f0ce19765daa3dfd8aaae4f118c9fa8d1da5735 Mon Sep 17 00:00:00 2001
From: LoukasPap <loukas.ppd@gmail.com>
Date: Thu, 18 Jun 2026 15:16:17 +0300
Subject: [PATCH] Fix floating toolbar positioning to ensure it fits within the
 viewport

---
 src/display/editor/toolbar.js              |  43 ++++++-
 test/integration/floating_toolbar_spec.mjs | 137 +++++++++++++++++++++
 test/pdfs/.gitignore                       |   1 +
 test/pdfs/floating-toolbar-positioning.pdf | Bin 0 -> 16350 bytes
 test/test_manifest.json                    |   7 ++
 5 files changed, 186 insertions(+), 2 deletions(-)
 create mode 100644 test/integration/floating_toolbar_spec.mjs
 create mode 100644 test/pdfs/floating-toolbar-positioning.pdf

diff --git a/src/display/editor/toolbar.js b/src/display/editor/toolbar.js
index 563ad965e01e2..36e286210e70b 100644
--- a/src/display/editor/toolbar.js
+++ b/src/display/editor/toolbar.js
@@ -341,8 +341,47 @@ class FloatingToolbar {
     const [x, y] = this.#getLastPoint(boxes, isLTR);
     const { style } = (this.#toolbar ||= this.#render());
     parent.append(this.#toolbar);
-    style.insetInlineEnd = `${100 * x}%`;
-    style.top = `calc(${100 * y}% + var(--editor-toolbar-vert-offset))`;
+
+    const parentRect = parent.getBoundingClientRect();
+    const parentHeight = parentRect.height;
+    const parentWidth = parentRect.width;
+
+    const toolbarRect = this.#toolbar.getBoundingClientRect();
+    const toolbarHeight = toolbarRect.height;
+    const toolbarWidth = toolbarRect.width;
+    const offset = parseFloat(
+      getComputedStyle(parent).getPropertyValue("--editor-toolbar-vert-offset")
+    );
+
+    // Y-axis positioning: check if toolbar fits below the text
+    const textBottomY = parentHeight * y;
+    const toolbarBottomY = textBottomY + offset + toolbarHeight;
+
+    if (toolbarBottomY <= parentHeight) {
+      // Toolbar fits below: position toolbar below the text
+      style.top = `calc(${100 * y}% + var(--editor-toolbar-vert-offset))`;
+    } else {
+      // Toolbar doesn't fit below: position toolbar above the text.
+      // The first box will always have the lowest Y because reading
+      // is from top to bottom and boxes[0] is the topmost text.
+      const lowestY = boxes[0].y * 100;
+      style.top = `max(0px, calc(${lowestY}% - ${toolbarHeight}px - var(--editor-toolbar-vert-offset)))`;
+    }
+
+    // X-axis positioning: check if toolbar fits on the right side
+    const textRightX = parentWidth * (1 - x);
+    const toolbarLeftX = textRightX - toolbarWidth;
+
+    if (toolbarLeftX >= 0) {
+      // Toolbar fits on the right: align right with the text
+      style.insetInlineEnd = `${100 * x}%`;
+      style.insetInlineStart = "";
+    } else {
+      // Toolbar doesn't fit on the right: align left with the start of the text
+      const minX = boxes[0].x * 100;
+      style.insetInlineStart = `${minX}%`;
+      style.insetInlineEnd = "";
+    }
   }
 
   hide() {
diff --git a/test/integration/floating_toolbar_spec.mjs b/test/integration/floating_toolbar_spec.mjs
new file mode 100644
index 0000000000000..c20822febc0b5
--- /dev/null
+++ b/test/integration/floating_toolbar_spec.mjs
@@ -0,0 +1,137 @@
+/* Copyright 2026 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {
+  closePages,
+  getRect,
+  getSpanRectFromText,
+  loadAndWait,
+} from "./test_utils.mjs";
+
+async function selectTextAndShowToolbar(page, pageNumber, text) {
+  const rect = await getSpanRectFromText(page, pageNumber, text);
+  const x = rect.x + rect.width * 0.5;
+  const y = rect.y + rect.height * 0.5;
+  await page.mouse.click(x, y, { count: 2, delay: 400 });
+  await page.waitForSelector(".editToolbar", { timeout: 2000 });
+  return rect;
+}
+
+function expectToolbarWithinPage(browserName, toolbarBounds, pageBounds) {
+  expect(toolbarBounds.x)
+    .withContext(
+      `In ${browserName}: Toolbar should not be cut off at the left of the page`
+    )
+    .toBeGreaterThanOrEqual(pageBounds.x);
+
+  expect(toolbarBounds.x + toolbarBounds.width)
+    .withContext(
+      `In ${browserName}: Toolbar should not be cut off at the right of the page`
+    )
+    .toBeLessThanOrEqual(pageBounds.x + pageBounds.width);
+
+  expect(toolbarBounds.y)
+    .withContext(
+      `In ${browserName}: Toolbar should not be cut off at the top of the page`
+    )
+    .toBeGreaterThanOrEqual(pageBounds.y);
+
+  expect(toolbarBounds.y + toolbarBounds.height)
+    .withContext(
+      `In ${browserName}: Toolbar should not be cut off at the bottom of the page`
+    )
+    .toBeLessThanOrEqual(pageBounds.y + pageBounds.height);
+}
+
+function expectToolbarBelowText(browserName, toolbarBounds, textRect) {
+  expect(toolbarBounds.y)
+    .withContext(`In ${browserName}: Toolbar should be shown below the text`)
+    .toBeGreaterThanOrEqual(textRect.y + textRect.height);
+}
+
+function expectToolbarAboveText(browserName, toolbarBounds, textRect) {
+  expect(toolbarBounds.y + toolbarBounds.height)
+    .withContext(`In ${browserName}: Toolbar should be shown above the text`)
+    .toBeLessThanOrEqual(textRect.y);
+}
+
+describe("Floating Toolbar Positioning", () => {
+  describe("Toolbar positioning with text selection", () => {
+    let pages;
+
+    beforeEach(async () => {
+      pages = await loadAndWait(
+        "floating-toolbar-positioning.pdf",
+        ".textLayer"
+      );
+    });
+
+    afterEach(async () => {
+      await closePages(pages);
+    });
+
+    it("must show the toolbar below the text and inside the page when selecting BR", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          const textRect = await selectTextAndShowToolbar(page, 1, "BR");
+          const toolbarBounds = await getRect(page, ".editToolbar");
+          const pageBounds = await getRect(page, '.page[data-page-number="1"]');
+
+          expectToolbarWithinPage(browserName, toolbarBounds, pageBounds);
+          expectToolbarBelowText(browserName, toolbarBounds, textRect);
+        })
+      );
+    });
+
+    it("must show the toolbar below the text and inside the page when selecting BL", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          const textRect = await selectTextAndShowToolbar(page, 1, "BL");
+          const toolbarBounds = await getRect(page, ".editToolbar");
+          const pageBounds = await getRect(page, '.page[data-page-number="1"]');
+
+          expectToolbarWithinPage(browserName, toolbarBounds, pageBounds);
+          expectToolbarBelowText(browserName, toolbarBounds, textRect);
+        })
+      );
+    });
+
+    it("must show the toolbar above the text and inside the page when selecting TR", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          const textRect = await selectTextAndShowToolbar(page, 1, "TR");
+          const toolbarBounds = await getRect(page, ".editToolbar");
+          const pageBounds = await getRect(page, '.page[data-page-number="1"]');
+
+          expectToolbarWithinPage(browserName, toolbarBounds, pageBounds);
+          expectToolbarAboveText(browserName, toolbarBounds, textRect);
+        })
+      );
+    });
+
+    it("must show the toolbar above the text and inside the page when selecting TL", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          const textRect = await selectTextAndShowToolbar(page, 1, "TL");
+          const toolbarBounds = await getRect(page, ".editToolbar");
+          const pageBounds = await getRect(page, '.page[data-page-number="1"]');
+
+          expectToolbarWithinPage(browserName, toolbarBounds, pageBounds);
+          expectToolbarAboveText(browserName, toolbarBounds, textRect);
+        })
+      );
+    });
+  });
+});
diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index b617ab60badf8..196c3b1b711ff 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -547,6 +547,7 @@
 !issue11549_reduced.pdf
 !issue8097_reduced.pdf
 !issue15262.pdf
+!floating-toolbar-positioning.pdf
 !issue17904.pdf
 !bug1743245.pdf
 !quadpoints.pdf
diff --git a/test/pdfs/floating-toolbar-positioning.pdf b/test/pdfs/floating-toolbar-positioning.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..d7ae60da7fa9dabb746dafcdc8de92ec6cd350d5
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literal 0
HcmV?d00001

diff --git a/test/test_manifest.json b/test/test_manifest.json
index 08b6dfdbf7ec8..417c656a05ee0 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -13501,6 +13501,13 @@
     "type": "eq",
     "useWasm": false
   },
+  {
+    "id": "floating-toolbar-positioning",
+    "file": "pdfs/floating-toolbar-positioning.pdf",
+    "md5": "bef4ff1ef3b51b1dffb3e84e60d1c900",
+    "rounds": 1,
+    "type": "eq"
+  },
   {
     "id": "jbig2_bitmap_initially_unknown_size",
     "file": "pdfs/bitmap-initially-unknown-size.pdf",