behavior-batch-selector.js
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	/**
	* @provides javelin-behavior-maniphest-batch-selector
	* @requires javelin-behavior
	* javelin-dom
	* javelin-stratcom
	* javelin-util
	*/

	JX.behavior('maniphest-batch-selector', function(config) {

	var selected = {};

	// Test if a task node is selected.

	var get_id = function(task) {
	return JX.Stratcom.getData(task).taskID;
	};

	var is_selected = function(task) {
	return (get_id(task) in selected);
	};

	// Change the selected state of a task.

	var change = function(task, to) {
	if (to === undefined) {
	to = !is_selected(task);
	}

	if (to) {
	selected[get_id(task)] = true;
	} else {
	delete selected[get_id(task)];
	}

	JX.DOM.alterClass(
	task,
	'phui-oi-selected',
	is_selected(task));

	update();
	};

	// Change all tasks to some state (used by "select all" / "clear selection"
	// buttons).

	var changeall = function(to) {
	var inputs = JX.DOM.scry(document.body, 'li', 'maniphest-task');
	for (var ii = 0; ii < inputs.length; ii++) {
	change(inputs[ii], to);
	}
	};

	// Clear any document text selection after toggling a task via shift click,
	// since errant clicks tend to start selecting various ranges otherwise.

	var clear_selection = function() {
	if (window.getSelection) {
	if (window.getSelection().empty) {
	window.getSelection().empty();
	} else if (window.getSelection().removeAllRanges) {
	window.getSelection().removeAllRanges();
	}
	} else if (document.selection) {
	document.selection.empty();
	}
	};

	// Update the status text showing how many tasks are selected, and the button
	// state.

	var update = function() {
	var count = JX.keys(selected).length;
	var status;
	if (count === 0) {
	status = 'Shift-Click to Select Tasks';
	} else if (status == 1) {
	status = '1 Selected Task';
	} else {
	status = count + ' Selected Tasks';
	}
	JX.DOM.setContent(JX.$(config.status), status);

	var submit = JX.$(config.submit);
	var disable = (count === 0);
	submit.disabled = disable;
	JX.DOM.alterClass(submit, 'disabled', disable);
	};

	// When he user shift-clicks the task, update the rest of the application
	// state.

	JX.Stratcom.listen(
	'click',
	'maniphest-task',
	function(e) {
	var raw = e.getRawEvent();
	if (!raw.shiftKey) {
	return;
	}

	if (raw.ctrlKey \|\| raw.altKey \|\| raw.metaKey \|\| e.isRightButton()) {
	return;
	}

	if (JX.Stratcom.pass(e)) {
	return;
	}

	e.kill();
	change(e.getNode('maniphest-task'));

	clear_selection();
	});


	// When the user clicks "Select All", select all tasks.

	JX.DOM.listen(
	JX.$(config.selectNone),
	'click',
	null,
	function(e) {
	changeall(false);
	e.kill();
	});


	// When the user clicks "Clear Selection", clear the selection.

	JX.DOM.listen(
	JX.$(config.selectAll),
	'click',
	null,
	function(e) {
	changeall(true);
	e.kill();
	});

	// When the user submits the form, dump selected state into it.

	JX.DOM.listen(
	JX.$(config.formID),
	'submit',
	null,
	function() {
	var ids = [];
	for (var k in selected) {
	ids.push(k);
	}
	ids = ids.join(',');

	var input = JX.$N('input', {type: 'hidden', name: 'ids', value: ids});

	JX.DOM.setContent(JX.$(config.idContainer), input);
	});

	update();

	});

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