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const Gtk = imports.gi.Gtk;
const Lang = imports.lang;
const CategoryLayoutManager = new Lang.Class({
Name: 'CategoryLayoutManager',
Extends: Gtk.Grid,
_init: function(props) {
props = props || {};
props.row_homogeneous = true;
//we don't make the columns homogenous because the 0th column
//needs to be 37% of the screen, according to designs.
this.parent(props);
this._childWidgets = [];
this._mainWidget = null;
},
// Distribute children in two columns, except for the last one if an odd
// number; that should span two columns
_redistributeChildren: function() {
let numChildren = this._childWidgets.length;
let oddNumber = numChildren % 2 == 1;
let numRows = 1;
this._childWidgets.forEach(function(child, index) {
let column = (index % 2) + 1; //plus 1 because the mainWidget is the 0 column.
let row = Math.floor(index / 2);
if(numRows < row + 1)
numRows = row + 1; //our running count of how many rows we have, which we
//need when we add the main widget.
if(child.get_parent() === this)
Gtk.Container.prototype.remove.call(this,
this._childWidgets[index]);
if(oddNumber && index == numChildren - 1)
this.attach(child, 1, row, 2, 1);
else
this.attach(child, column, row, 1, 1);
}, this);
if(this._mainWidget) {
if(this._mainWidget.get_parent() === this) {
Gtk.Container.prototype.remove.call(this, this._mainWidget);
}
this.attach(this._mainWidget, 0, 0, 1, numRows);
}
},
add: function(child) {
if(child.is_main_category) {
this._mainWidget = child;
} else {
this._childWidgets.push(child);
}
this._redistributeChildren();
},
remove: function(child) {
let index = this._childWidgets.indexOf(child);
if(index == -1) {
printerr('Widget', System.addressOf(child),
'is not contained in CategoryLayoutManager');
return;
}
this._childWidgets.splice(index, 1); // remove
this._redistributeChildren();
}
});
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