Commit 774db790 authored by Jonathan Wilkes's avatar Jonathan Wilkes
Browse files

fix scrollbar/menu display bug-- activating the menu was causing bottom scrollbar to appear

fix edge case where menu was appearing on top of the dropdown button
more commenting of oddities
parent 93437a5a
......@@ -4597,7 +4597,7 @@ function dropdown_populate(cid, label_array, current_index) {
function gui_dropdown_activate(cid, obj_tag, tag, current_index, font_size, state, label_array) {
var g, select_elem, svg_view, g_bbox,
w_height, // excluding the scrollbar
doc_height, // document height, excluding the scrollbar
menu_height, // height of the list of elements inside the div
div_y, // position of div containing the dropdown menu
div_max, // max height of the div
......@@ -4612,16 +4612,21 @@ function gui_dropdown_activate(cid, obj_tag, tag, current_index, font_size, stat
.viewBox.baseVal;
select_elem = patchwin[cid]
.window.document.querySelector("#dropdown_list");
select_elem.style.setProperty("display", "inline");
dropdown_populate(cid, label_array, current_index);
// stick the obj_tag in a data field
select_elem.setAttribute("data-callback", obj_tag);
// display the menu so we can measure it
g_bbox = g.getBoundingClientRect();
w_height =
// Measuring the document height is tricky-- the following
// method is the only reliable one I've found. And even here,
// if you display the select_elem as inline _before_ measuring
// the doc height, the result ends up being _smaller_. No idea.
doc_height =
patchwin[cid].window.document.documentElement
.clientHeight;
// Now let's display the select_elem div so we can measure it
select_elem.style.setProperty("display", "inline");
menu_height = select_elem.querySelector("ol")
.getBoundingClientRect().height;
scroll_y = patchwin[cid].window.scrollY;
......@@ -4630,18 +4635,18 @@ function gui_dropdown_activate(cid, obj_tag, tag, current_index, font_size, stat
// If the entire menu won't fit below the object but _will_
// fit above it, display it above the object.
// If the menu needs a scrollbar, display it below the object
if (w_height - g_bbox.bottom <= 75
|| (menu_height > w_height - g_bbox.bottom
if (doc_height - g_bbox.bottom <= 75
|| (menu_height > doc_height - g_bbox.bottom
&& menu_height <= g_bbox.top)) {
// menu on top
offset_anchor = "bottom";
div_max = g_bbox.top - 1;
div_y = w_height - (g_bbox.top + scroll_y);
div_max = g_bbox.top - 2;
div_y = doc_height - (g_bbox.top + scroll_y);
}
else {
// menu on bottom (possibly with scrollbar)
offset_anchor = "top";
div_max = w_height - g_bbox.bottom - 1;
div_max = doc_height - g_bbox.bottom - 2;
div_y = g_bbox.bottom + scroll_y;
}
// set a max-height to force scrollbar if needed
......
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