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Edit style: retain scroll position of window & editor

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This commit is contained in:
tophf 2015-03-11 00:48:42 +03:00
parent f654cc734f
commit c084ea3973
1 changed files with 39 additions and 2 deletions
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41
edit.js
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@ -1,5 +1,6 @@
var styleId = null;
var dirty = false;
var lockScroll; // ensure the section doesn't jump when clicking selected text
var appliesToTemplate = document.createElement("li");
appliesToTemplate.innerHTML = '<select name="applies-type" class="applies-type"><option value="url">' + t("appliesUrlOption") + '</option><option value="url-prefix">' + t("appliesUrlPrefixOption") + '</option><option value="domain">' + t("appliesDomainOption") + '</option><option value="regexp">' + t("appliesRegexpOption") + '</option></select><input name="applies-value" class="applies-value"><button class="remove-applies-to">' + t("appliesRemove") + '</button><button class="add-applies-to">' + t("appliesAdd") + '</button>';
@ -53,17 +54,53 @@ function setupCodeMirror(textarea) {
var section = cm.display.wrapper.parentNode;
var bounds = section.getBoundingClientRect();
if ((bounds.bottom > window.innerHeight && bounds.top > 0) || (bounds.top < 0 && bounds.bottom < window.innerHeight)) {
if (bounds.top > window.innerHeight || bounds.top < 0) {
section.scrollIntoView();
lockScroll = null;
if (bounds.top < 0) {
window.scrollBy(0, bounds.top - 1);
} else {
window.scrollBy(0, bounds.bottom - window.innerHeight + 1);
}
// prevent possible double fire of selection change event induced by window.scrollBy
var selectionChangeCount = 0, selection;
function beforeSelectionChange(cm, obj) {
if (++selectionChangeCount == 1) {
selection = obj.ranges;
} else {
obj.update(selection);
cm.off("beforeSelectionChange", beforeSelectionChange);
}
}
cm.on("beforeSelectionChange", beforeSelectionChange);
setTimeout(function() {
cm.off("beforeSelectionChange", beforeSelectionChange)
}, 200);
}
});
// ensure the section doesn't jump when clicking selected text
cm.on("cursorActivity", function(cm) {
setTimeout(function() {
lockScroll = {
windowScrollY: window.scrollY,
editor: cm,
editorScrollInfo: cm.getScrollInfo()
}
}, 0);
});
editors.push(cm);
}
// ensure the section doesn't jump when clicking selected text
document.addEventListener("scroll", function(e) {
if (lockScroll && lockScroll.windowScrollY != window.scrollY) {
window.scrollTo(0, lockScroll.windowScrollY);
lockScroll.editor.scrollTo(lockScroll.editorScrollInfo.left, lockScroll.editorScrollInfo.top);
lockScroll = null;
}
});
function makeDirty() {
dirty = true;
}