enigma-bbs/core/vertical_menu_view.js

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JavaScript
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/* jslint node: true */
'use strict';
var MenuView = require('./menu_view.js').MenuView;
var ansi = require('./ansi_term.js');
var strUtil = require('./string_util.js');
var util = require('util');
var assert = require('assert');
exports.VerticalMenuView = VerticalMenuView;
function VerticalMenuView(options) {
options.cursor = options.cursor || 'hide';
MenuView.call(this, options);
var self = this;
this.itemSpacing = 3;
this.calculateDimens = function() {
if(!self.dimens || !self.dimens.width) {
var l = 0;
self.items.forEach(function onItem(item) {
if(item.text.length > l) {
l = item.text.length;
}
});
self.dimens = self.dimens || {};
self.dimens.width = l;
}
if(this.items.length > 0) {
this.dimens.height = (self.items.length * self.itemSpacing) - (self.itemSpacing - 1);
} else {
this.dimens.height = 0;
}
};
this.calculateDimens();
this.cachePositions = function() {
if(self.positionCacheExpired) {
var count = this.items.length;
var x = self.position.x;
for(var i = 0; i < count; ++i) {
if(i > 0) {
x += self.itemSpacing;
}
self.items[i].xPosition = x;
}
self.positionCacheExpired = false;
}
};
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this.drawItem = function(index) {
assert(!this.positionCacheExpired);
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var item = self.items[index];
if(!item) {
return;
}
self.client.term.write(ansi.goto(item.xPosition, self.position.y));
this.client.term.write(self.getANSIColor(
index === self.focusedItemIndex || item.selected ? self.getFocusColor() : self.getColor()));
var text = strUtil.stylizeString(item.text, item.focused ? self.focusTextStyle : self.textStyle);
self.client.term.write(
strUtil.pad(text, this.dimens.width, this.fillChar, this.justify));
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};
}
util.inherits(VerticalMenuView, MenuView);
VerticalMenuView.prototype.setPosition = function(pos) {
VerticalMenuView.super_.prototype.setPosition.call(this, pos);
this.positionCacheExpired = true;
};
VerticalMenuView.prototype.setFocus = function(focused) {
VerticalMenuView.super_.prototype.setFocus.call(this, focused);
this.redraw();
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};
VerticalMenuView.prototype.onSpecialKeyPress = function(keyName) {
var prevFocusedItemIndex = this.focusedItemIndex;
if(this.isSpecialKeyMapped('up', keyName)) {
if(0 === this.focusedItemIndex) {
this.focusedItemIndex = this.items.length - 1;
} else {
this.focusedItemIndex--;
}
} else if(this.isSpecialKeyMapped('down', keyName)) {
if(this.items.length - 1 === this.focusedItemIndex) {
this.focusedItemIndex = 0;
} else {
this.focusedItemIndex++;
}
}
if(prevFocusedItemIndex !== this.focusedItemIndex) {
this.moveSelection(prevFocusedItemIndex, this.focusedItemIndex);
}
VerticalMenuView.super_.prototype.onSpecialKeyPress.call(this, keyName);
};
VerticalMenuView.prototype.getViewData = function() {
return this.focusedItemIndex;
};
VerticalMenuView.prototype.setItems = function(items) {
VerticalMenuView.super_.prototype.setItems.call(this, items);
this.positionCacheExpired = true;
this.cachePositions();
this.calculateDimens();
};