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Lazy Layout: don't assume bg is already cleared

master
Ben Whittaker 2021-09-27 11:00:22 -04:00
parent f3fd0f256a
commit be5539d948
1 changed files with 11 additions and 7 deletions
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18
modules/Layout.js
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@ -154,16 +154,20 @@ function touchHandler(l,e) {
if (l.c) l.c.forEach(n => touchHandler(n,e));
}
function prepareLazyRender(l, rectsToClear, drawList, rects, bgCol) {
if ((l.bgCol != null && l.bgCol != bgCol) || l.type == "txt" || l.type == "btn" || l.type == "img" || l.type == "custom") {
function prepareLazyRender(l, rectsToClear, drawList, rects, parentBg) {
var bgCol = l.bgCol == null ? parentBg : g.toColor(l.bgCol);
if (bgCol != parentBg || l.type == "txt" || l.type == "btn" || l.type == "img" || l.type == "custom") {
// Hash the layoutObject without including its children
let c = l.c;
var c = l.c;
delete l.c;
let hash = "H"+E.CRC32(E.toJS(l)); // String keys maintain insertion order
var hash = "H"+E.CRC32(E.toJS(l)); // String keys maintain insertion order
if (c) l.c = c;
if (!delete rectsToClear[hash]) {
rects[hash] = {bg: bgCol, r: [l.x,l.y,l.x+l.w-1,l.y+l.h-1]};
rects[hash] = {
bg: parentBg == null ? g.theme.bg : parentBg,
r: [l.x,l.y,l.x+l.w-1,l.y+l.h-1]
};
if (drawList) {
drawList.push(l);
drawList = null; // Prevent children from being redundantly added to the drawList
@ -171,7 +175,7 @@ function prepareLazyRender(l, rectsToClear, drawList, rects, bgCol) {
}
}
if (l.c) for (let ch of l.c) prepareLazyRender(ch, rectsToClear, drawList, rects, l.bgCol == null ? bgCol : l.bgCol);
if (l.c) for (var ch of l.c) prepareLazyRender(ch, rectsToClear, drawList, rects, bgCol);
}
Layout.prototype.render = function (l) {
@ -220,7 +224,7 @@ Layout.prototype.render = function (l) {
if (!this.rects) this.rects = {};
var rectsToClear = this.rects.clone();
var drawList = [];
prepareLazyRender(l, rectsToClear, drawList, this.rects, g.getBgColor());
prepareLazyRender(l, rectsToClear, drawList, this.rects, null);
for (var h in rectsToClear) delete this.rects[h];
var clearList = Object.keys(rectsToClear).map(k=>rectsToClear[k]).reverse(); // Rects are cleared in reverse order so that the original bg color is restored
for (var r of clearList) g.setBgColor(r.bg).clearRect.apply(g, r.r);