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// extend NixOS options to handle the Tree View. Should be better to keep a
// separation of concern here.
Option.prototype.tv_opened = false;
Option.prototype.tv_size = 1;
Option.prototype.tv_open = function () {
this.tv_opened = true;
this.tv_size = 1;
// load an option if it is not loaded yet, and initialize them to be
// read by the Option view.
if (!this.isLoaded)
this.load();
// If this is not an option, then add it's lits of sub-options size.
if (!this.isOption)
{
for (var i = 0; i < this.subOptions.length; i++)
this.tv_size += this.subOptions[i].tv_size;
}
};
Option.prototype.tv_close = function () {
this.tv_opened = false;
this.tv_size = 1;
};
function OptionView (root, selCallback) {
root.tv_open();
this.rootOption = root;
this.selCallback = selCallback;
}
OptionView.prototype = {
rootOption: null,
selCallback: null,
// This function returns the path to option which is at the specified row.
reach_cache: null,
reachRow: function (row) {
var o = this.rootOption; // Current option.
var r = 0; // Number of rows traversed.
var c = 0; // Child index.
var path = [{ row: r, opt: o }]; // new Array();
// hypothesis: this.rootOption.tv_size is always open and bigger than
// Use the previous returned value to avoid making to many checks and to
// optimize for frequent access of near rows.
if (this.reach_cache != null)
{
for (var i = this.reach_cache.length - 2; i >= 0; i--) {
var p = this.reach_cache[i];
// If we will have to go the same path.
if (row >= p.row && row < p.row + p.opt.tv_size)
{
path.unshift(p);
r = path[0].row;
o = path[0].opt;
}
else
break;
};
}
while (r != row)
{
// Go deeper in the child which contains the requested row. The
// tv_size contains the size of the tree starting from each option.
c = 0;
while (c < o.subOptions.length && r + o.subOptions[c].tv_size < row)
{
r += o.subOptions[c].tv_size;
c += 1;
}
if (c < o.subOptions.length && r + o.subOptions[c].tv_size >= row)
{
// Count the current option as a row.
o = o.subOptions[c];
r += 1;
}
else
alert("WTF: " + o.name + " ask: " + row + " children: " + o.subOptions + " c: " + c);
path.unshift({ row: r, opt: o });
}
this.reach_cache = path;
return path;
},
// needs to return true if there is a /row/ at the same level /after/ a
// given row.
hasNextSibling: function(row, after) {
log("sibling " + row + " after " + after);
var path = reachRow(row);
if (path.length > 1)
{
var last = path[1].row + path[1].opt.tv_size;
// Has a next sibling if the row is not over the size of the
// parent and if the current one is not the last child.
return after + 1 < last && path[0].row + path[0].opt.tv_size < last;
}
else
// The top-level option has no sibling.
return false;
},
// Does the current row contain any sub-options?
isContainer: function(row) {
return !this.reachRow(row)[0].opt.isOption;
},
isContainerEmpty: function(row) {
return this.reachRow(row)[0].opt.subOptions.length == 0;
},
isContainerOpen: function(row) {
return this.reachRow(row)[0].opt.tv_opened;
},
// Open or close an option.
toggleOpenState: function (row) {
var path = this.reachRow(row);
var delta = -path[0].opt.tv_size;
if (path[0].opt.tv_opened)
path[0].opt.tv_close();
else
path[0].opt.tv_open();
delta += path[0].opt.tv_size;
// Parents are alreay opened, but we need to update the tv_size
// counters. Thus we have to invalidate the reach cache.
this.reach_cache = null;
for (var i = 1; i < path.length; i++)
path[i].opt.tv_open();
this.tree.rowCountChanged(row + 1, delta);
},
// Return the identation level of the option at the line /row/. The
// top-level level is 0.
getLevel: function(row) {
return this.reachRow(row).length - 1;
},
// Obtain the index of a parent row. If there is no parent row,
// returns -1.
getParentIndex: function(row) {
var path = this.reachRow(row);
if (path.length > 1)
return path[1].row;
else
return -1;
},
// Return the content of each row base on the column name.
getCellText: function(row, column) {
if (column.id == "opt-name")
return this.reachRow(row)[0].opt.name;
if (column.id == "dbg-size")
return this.reachRow(row)[0].opt.tv_size;
return "";
},
// We have no column with images.
getCellValue: function(row, column) { },
isSelectable: function(row, column) { return true; },
// Get the selection out of the tree and give options to the call back
// function.
selectionChanged: function() {
if (this.selCallback == null)
return;
var opts = [];
var start = new Object();
var end = new Object();
var numRanges = this.tree.view.selection.getRangeCount();
for (var t = 0; t < numRanges; t++) {
this.tree.view.selection.getRangeAt(t,start,end);
for (var v = start.value; v <= end.value; v++) {
var opt = this.reachRow(v)[0].opt;
if (!opt.isLoaded)
opt.load();
if (opt.isOption)
opts.push(opt);
// FIXME: no need to make things slowing down, because our current
// callback do not handle multiple option display.
if (!opts.empty)
break;
}
// FIXME: no need to make things slowing down, because our current
// callback do not handle multiple option display.
if (!opts.empty)
break;
}
if (!opts.empty)
this.selCallback(opts);
},
set rowCount(c) { throw "rowCount is a readonly property"; },
get rowCount() { return this.rootOption.tv_size; },
// refuse drag-n-drop of options.
canDrop: function (index, orientation, dataTransfer) { return false; },
drop: function (index, orientation, dataTransfer) { },
// ?
getCellProperties: function(row, column, prop) { },
getColumnProperties: function(column, prop) { },
getRowProperties: function(row, prop) { },
getImageSrc: function(row, column) { },
// No progress columns are used.
getProgressMode: function(row, column) { },
// Do not add options yet.
isEditable: function(row, column) { return false; },
setCellValue: function(row, column, value) { },
setCellText: function(row, column, value) { },
// ...
isSeparator: function(index) { return false; },
isSorted: function() { return false; },
performAction: function(action) { },
performActionOnCell: function(action, row, column) { },
performActionOnRow: function(action, row) { }, // ??
// ??
cycleCell: function (row, col) { },
cycleHeader: function(col) { },
selection: null,
tree: null,
setTree: function(tree) { this.tree = tree; }
};
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