90 lines
3.4 KiB
Diff
90 lines
3.4 KiB
Diff
From 01a0f96b40345642b1100a583b13a2f67487f642 Mon Sep 17 00:00:00 2001
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From: Michael Gratton <mike@vee.net>
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Date: Sat, 17 Oct 2020 11:29:05 +1100
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Subject: [PATCH 103/124] ui/components-web-view.js: Use ResizeObserver for
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watching pref height
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Rather than guessing when the height might change by using a number
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of different event listeners, use a ResizeObserver to get direct
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notifications of any changes to the HTML element's size.
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---
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ui/components-web-view.js | 54 ++++-----------------------------------
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1 file changed, 5 insertions(+), 49 deletions(-)
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diff --git a/ui/components-web-view.js b/ui/components-web-view.js
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index d0998a67..34bf0430 100644
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--- a/ui/components-web-view.js
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+++ b/ui/components-web-view.js
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@@ -41,7 +41,12 @@ PageState.prototype = {
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}
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});
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+ this.heightObserver = new ResizeObserver((entries) => {
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+ state.updatePreferredHeight();
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+ });
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+
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document.addEventListener("DOMContentLoaded", function(e) {
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+ state.heightObserver.observe(window.document.documentElement);
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state.loaded();
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});
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@@ -49,55 +54,6 @@ PageState.prototype = {
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state.selectionChanged();
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});
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- // Coalesce multiple calls to updatePreferredHeight using a
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- // timeout to avoid the overhead of multiple JS messages sent
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- // to the app and hence view multiple resizes being queued.
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- let queueTimeout = null;
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- let queuePreferredHeightUpdate = function() {
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- if (queueTimeout != null) {
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- clearTimeout(queueTimeout);
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- }
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- queueTimeout = setTimeout(
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- function() { state.updatePreferredHeight(); }, 100
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- );
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- };
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-
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- // Queues an update when the complete document is loaded.
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- //
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- // Note also that the delay introduced here by this last call
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- // to queuePreferredHeightUpdate when the complete document is
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- // loaded seems to be important to get an accurate idea of the
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- // final document size.
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- window.addEventListener("load", function(e) {
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- queuePreferredHeightUpdate();
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- }, true); // load does not bubble
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-
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- // Queues updates for any STYLE, IMG and other loaded
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- // elements, hence handles resizing when the user later
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- // requests remote images loading.
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- document.addEventListener("load", function(e) {
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- queuePreferredHeightUpdate();
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- }, true); // load does not bubble
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-
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- // Queues an update if the window changes size, e.g. if the
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- // user resized the window. Only trigger when the width has
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- // changed however since the height should only change as the
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- // body is being loaded.
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- let width = window.innerWidth;
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- window.addEventListener("resize", function(e) {
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- let currentWidth = window.innerWidth;
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- if (width != currentWidth) {
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- width = currentWidth;
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- queuePreferredHeightUpdate();
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- }
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- }, false); // load does not bubble
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-
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- // Queues an update when a transition has completed, e.g. if the
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- // user resized the window
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- window.addEventListener("transitionend", function(e) {
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- queuePreferredHeightUpdate();
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- }, false); // load does not bubble
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-
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this.testResult = null;
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},
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getPreferredHeight: function() {
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--
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2.29.2
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