| <!doctype HTML> |
| |
| <!-- |
| Runs an acquireDisplayLock which constructs and measures a subtree. |
| This should do a forced layout. |
| --> |
| |
| <style> |
| #container { |
| contain: content; |
| width: 100px; |
| height: 100px; |
| background: lightgreen; |
| } |
| .child { |
| width: 20px; |
| height: 20%; |
| background: cyan; |
| } |
| #spacer { |
| width: 150px; |
| height: 150px; |
| background: green; |
| } |
| </style> |
| |
| <div id="parent"></div> |
| <div id="spacer"></div> |
| |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| |
| <script> |
| async_test((t) => { |
| function createChild(id) { |
| let child = document.createElement("div"); |
| child.classList = "child"; |
| child.id = id; |
| return child; |
| } |
| |
| function measure(context) { |
| context.lockedElement.appendChild(createChild("0")); |
| context.lockedElement.appendChild(createChild("1")); |
| context.lockedElement.appendChild(createChild("2")); |
| |
| t.step(() => { |
| // Ensure children are laid out; this forces a layout. |
| assert_equals(document.getElementById("0").offsetTop, 0, "0 in measure"); |
| assert_equals(document.getElementById("1").offsetTop, 20, "1 in measure"); |
| assert_equals(document.getElementById("2").offsetTop, 40, "2 in measure"); |
| // Both parent should be 0 height, since it's locked. Both parent and spacers |
| // should have 8 offsetTop. |
| assert_equals(document.getElementById("parent").offsetTop, 8, "parent in measure"); |
| assert_equals(document.getElementById("spacer").offsetTop, 8, "spacer in measure"); |
| }); |
| } |
| |
| function acquire() { |
| let container = document.createElement("div"); |
| container.id = "container"; |
| container.acquireDisplayLock(measure).then(() => { |
| // We have to do the final measurement on the next frame, since in the promise |
| // resolution we still can be relocked. |
| window.requestAnimationFrame(() => { |
| t.step(() => { |
| // Ensure children are still laid out. |
| assert_equals(document.getElementById("0").offsetTop, 0, "0 in completion"); |
| assert_equals(document.getElementById("1").offsetTop, 20, "1 in completion"); |
| assert_equals(document.getElementById("2").offsetTop, 40, "2 in completion"); |
| // Now the parent should encompass a container, so spacer is pushed down. |
| assert_equals(document.getElementById("parent").offsetTop, 8, "parent in completion"); |
| assert_equals(document.getElementById("spacer").offsetTop, 108, "spacer in completion"); |
| }); |
| t.done(); |
| }); |
| }); |
| document.getElementById("parent").appendChild(container); |
| } |
| |
| acquire(); |
| }, "Measure Forced Layout"); |
| </script> |
| |
