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https://github.com/RGBCube/serenity
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ac6b3c989d
With this change, instead of applying scroll offsets during the recording of the painting command list, we do the following: 1. Collect all boxes with scrollable overflow into a PaintContext, each with an id and the total amount of scrolling offset accumulated from ancestor scrollable boxes. 2. During the recording phase assign a corresponding scroll_frame_id to each command that paints content within a scrollable box. 3. Before executing the recorded commands, translate each command that has a scroll_frame_id by the accumulated scroll offset. This approach has following advantages: - Implementing nested scrollables becomes much simpler, as the recording phase only requires the correct assignment of the nearest scrollable's scroll_frame_id, while the accumulated offset from ancestors is applied subsequently. - The recording of painting commands is not tied to a specific offset within scrollable boxes, which means in the future, it will be possible to update the scrolling offset and repaint without the need to re-record painting commands.
46 lines
1 KiB
HTML
46 lines
1 KiB
HTML
<link rel="match" href="reference/scrollable-box-with-nested-stacking-context-ref.html" />
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<style>
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#scrollable-box {
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width: 300px;
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height: 500px;
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overflow: auto;
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position: relative;
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border: 2px solid black;
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}
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.content {
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height: 1000px;
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background-color: lightblue;
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}
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.abspos {
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position: absolute;
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bottom: 0px;
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right: 0px;
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width: 150px;
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height: 50px;
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background-color: coral;
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z-index: 1000;
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display: flex;
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}
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.box {
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background-color: magenta;
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width: 100px;
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height: 100px;
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position: relative;
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top: 0px;
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left: 0px;
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}
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</style>
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<div id="scrollable-box">
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<div class="content">
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Lots of scrollable content here!
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<div class="box">box</div>
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</div>
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<div class="abspos"><div class="box">box</div></div>
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</div>
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<script>
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const scrollContainer = document.getElementById("scrollable-box");
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scrollContainer.scrollTop = 500;
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</script>
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