61 lines
2.0 KiB
JavaScript
61 lines
2.0 KiB
JavaScript
// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
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const Lang = imports.lang;
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const Clutter = imports.gi.Clutter;
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const CenterLayout = new Lang.Class({
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Name: 'CenterLayout',
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Extends: Clutter.BoxLayout,
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vfunc_allocate: function(container, box, flags) {
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let rtl = container.get_text_direction() == Clutter.TextDirection.RTL;
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let availWidth = box.x2 - box.x1;
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let availHeight = box.y2 - box.y1;
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// Assume that these are the first three widgets and they are all visible.
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let [left, center, right] = container.get_children();
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// Only support horizontal layouts for now.
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let [leftMinWidth, leftNaturalWidth] = left.get_preferred_width(availHeight);
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let [centerMinWidth, centerNaturalWidth] = center.get_preferred_width(availHeight);
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let [rightMinWidth, rightNaturalWidth] = right.get_preferred_width(availHeight);
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let sideWidth = (availWidth - centerMinWidth) / 2;
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let childBox = new Clutter.ActorBox();
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childBox.y1 = box.y1;
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childBox.y2 = box.y1 + availHeight;
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let leftSide = Math.min(Math.floor(sideWidth), leftNaturalWidth);
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let rightSide = Math.min(Math.floor(sideWidth), rightNaturalWidth);
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if (rtl) {
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childBox.x1 = availWidth - leftSide;
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childBox.x2 = availWidth;
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} else {
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childBox.x1 = 0;
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childBox.x2 = leftSide;
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}
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childBox.x1 += box.x1;
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left.allocate(childBox, flags);
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let maxSide = Math.max(leftSide, rightSide);
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let sideWidth = Math.max((availWidth - centerNaturalWidth) / 2, maxSide);
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childBox.x1 = box.x1 + Math.ceil(sideWidth);
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childBox.x2 = box.x2 - Math.ceil(sideWidth);
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center.allocate(childBox, flags);
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if (rtl) {
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childBox.x1 = 0;
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childBox.x2 = rightSide;
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} else {
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childBox.x1 = availWidth - rightSide;
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childBox.x2 = availWidth;
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}
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childBox.x1 += box.x1;
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right.allocate(childBox, flags);
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}
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});
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