enigma-bbs/core/vertical_menu_view.js

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/* jslint node: true */
'use strict';
// ENiGMA½
const MenuView = require('./menu_view.js').MenuView;
const ansi = require('./ansi_term.js');
const strUtil = require('./string_util.js');
const formatString = require('./string_format');
const pipeToAnsi = require('./color_codes.js').pipeToAnsi;
// deps
const util = require('util');
const _ = require('lodash');
const { throws } = require('assert');
exports.VerticalMenuView = VerticalMenuView;
function VerticalMenuView(options) {
options.cursor = options.cursor || 'hide';
options.justify = options.justify || 'left';
this.focusItemAtTop = true;
MenuView.call(this, options);
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this.initDefaultWidth();
const self = this;
// we want page up/page down by default
if (!_.isObject(options.specialKeyMap)) {
Object.assign(this.specialKeyMap, {
'page up': ['page up'],
'page down': ['page down'],
});
}
this.autoAdjustHeightIfEnabled = function () {
if (this.autoAdjustHeight) {
this.dimens.height =
this.items.length * (this.itemSpacing + 1) - this.itemSpacing;
this.dimens.height = Math.min(
this.dimens.height,
this.client.term.termHeight - this.position.row
);
}
};
this.autoAdjustHeightIfEnabled();
this.updateViewVisibleItems = function () {
self.maxVisibleItems = Math.ceil(self.dimens.height / (self.itemSpacing + 1));
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const topIndex = (this.focusItemAtTop ? this.focusedItemIndex : 0) || 0;
self.viewWindow = {
top: topIndex,
bottom: Math.min(topIndex + self.maxVisibleItems, self.items.length) - 1,
};
};
this.drawItem = function (index) {
const item = self.items[index];
if (!item) {
return;
}
const cached = this.getRenderCacheItem(index, item.focused);
if (cached) {
return self.client.term.write(
`${ansi.goto(item.row, self.position.col)}${cached}`
);
}
let text;
let sgr;
if (item.focused && self.hasFocusItems()) {
const focusItem = self.focusItems[index];
text = focusItem ? focusItem.text : item.text;
sgr = '';
} else if (this.complexItems) {
text = pipeToAnsi(
formatString(
item.focused && this.focusItemFormat
? this.focusItemFormat
: this.itemFormat,
item
)
);
sgr = this.focusItemFormat
? ''
: index === self.focusedItemIndex
? self.getFocusSGR()
: self.getSGR();
} else {
text = strUtil.stylizeString(
item.text,
item.focused ? self.focusTextStyle : self.textStyle
);
sgr = index === self.focusedItemIndex ? self.getFocusSGR() : self.getSGR();
}
text = `${sgr}${strUtil.pad(
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`${text}${this.styleSGR1}`,
this.dimens.width,
this.fillChar,
this.justify
)}`;
self.client.term.write(`${ansi.goto(item.row, self.position.col)}${text}`);
this.setRenderCacheItem(index, text, item.focused);
};
this.drawRemovedItem = function (index) {
if (index <= this.items.length - 1) {
return;
}
const row = this.position.row + index;
this.client.term.rawWrite(
`${ansi.goto(row, this.position.col)}${ansi.normal()}${this.fillChar.repeat(
this.dimens.width
)}`
);
};
}
util.inherits(VerticalMenuView, MenuView);
VerticalMenuView.prototype.redraw = function () {
VerticalMenuView.super_.prototype.redraw.call(this);
// :TODO: rename positionCacheExpired to something that makese sense; combine methods for such
if (this.positionCacheExpired) {
this.autoAdjustHeightIfEnabled();
this.updateViewVisibleItems();
this.positionCacheExpired = false;
}
// erase old items
// :TODO: optimize this: only needed if a item is removed or new max width < old.
if (this.oldDimens) {
const blank = new Array(Math.max(this.oldDimens.width, this.dimens.width)).join(
' '
);
let seq = ansi.goto(this.position.row, this.position.col) + this.getSGR() + blank;
let row = this.position.row + 1;
const endRow = row + this.oldDimens.height - 2;
while (row <= endRow) {
seq += ansi.goto(row, this.position.col) + blank;
row += 1;
}
this.client.term.write(seq);
delete this.oldDimens;
}
if (this.items.length) {
let row = this.position.row;
for (let i = this.viewWindow.top; i <= this.viewWindow.bottom; ++i) {
this.items[i].row = row;
row += this.itemSpacing + 1;
this.items[i].focused = this.focusedItemIndex === i;
this.drawItem(i);
}
}
const remain = Math.max(0, this.dimens.height - this.items.length);
for (let i = this.items.length; i < remain; ++i) {
this.drawRemovedItem(i);
}
};
VerticalMenuView.prototype.setHeight = function (height) {
VerticalMenuView.super_.prototype.setHeight.call(this, height);
this.positionCacheExpired = true;
this.autoAdjustHeight = false;
};
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.setFocusItemIndex = function (index) {
VerticalMenuView.super_.prototype.setFocusItemIndex.call(this, index); // sets this.focusedItemIndex
const remainAfterFocus = this.focusItemAtTop
? this.items.length - index
: this.items.length;
if (remainAfterFocus >= this.maxVisibleItems) {
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const topIndex = (this.focusItemAtTop ? this.focusedItemIndex : 0) || 0;
this.viewWindow = {
top: topIndex,
bottom: Math.min(topIndex + this.maxVisibleItems, this.items.length) - 1,
};
this.positionCacheExpired = false; // skip standard behavior
this.autoAdjustHeightIfEnabled();
}
this.redraw();
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};
VerticalMenuView.prototype.onKeyPress = function (ch, key) {
if (key) {
if (this.isKeyMapped('up', key.name)) {
this.focusPrevious();
} else if (this.isKeyMapped('down', key.name)) {
this.focusNext();
} else if (this.isKeyMapped('page up', key.name)) {
this.focusPreviousPageItem();
} else if (this.isKeyMapped('page down', key.name)) {
this.focusNextPageItem();
} else if (this.isKeyMapped('home', key.name)) {
this.focusFirst();
} else if (this.isKeyMapped('end', key.name)) {
this.focusLast();
}
}
VerticalMenuView.super_.prototype.onKeyPress.call(this, ch, key);
};
VerticalMenuView.prototype.getData = function () {
const item = this.getItem(this.focusedItemIndex);
if (!item) {
return this.focusedItemIndex;
}
return _.isString(item.data) ? item.data : this.focusedItemIndex;
};
VerticalMenuView.prototype.setItems = function (items) {
// if we have items already, save off their drawing area so we don't leave fragments at redraw
if (this.items && this.items.length) {
this.oldDimens = Object.assign({}, this.dimens);
}
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VerticalMenuView.super_.prototype.setItems.call(this, items);
this.positionCacheExpired = true;
};
VerticalMenuView.prototype.removeItem = function (index) {
if (this.items && this.items.length) {
this.oldDimens = Object.assign({}, this.dimens);
}
VerticalMenuView.super_.prototype.removeItem.call(this, index);
};
// :TODO: Apply draw optimizaitons when only two items need drawn vs entire view!
VerticalMenuView.prototype.focusNext = function () {
if (this.items.length - 1 === this.focusedItemIndex) {
this.focusedItemIndex = 0;
this.viewWindow = {
top: 0,
bottom: Math.min(this.maxVisibleItems, this.items.length) - 1,
};
} else {
this.focusedItemIndex++;
if (this.focusedItemIndex > this.viewWindow.bottom) {
this.viewWindow.top++;
this.viewWindow.bottom++;
}
}
this.redraw();
VerticalMenuView.super_.prototype.focusNext.call(this);
};
VerticalMenuView.prototype.focusPrevious = function () {
if (0 === this.focusedItemIndex) {
this.focusedItemIndex = this.items.length - 1;
this.viewWindow = {
//top : this.items.length - this.maxVisibleItems,
top: Math.max(this.items.length - this.maxVisibleItems, 0),
bottom: this.items.length - 1,
};
} else {
this.focusedItemIndex--;
if (this.focusedItemIndex < this.viewWindow.top) {
this.viewWindow.top--;
this.viewWindow.bottom--;
// adjust for focus index being set & window needing expansion as we scroll up
const rem = this.viewWindow.bottom - this.viewWindow.top + 1;
if (
rem < this.maxVisibleItems &&
this.items.length - 1 > this.focusedItemIndex
) {
this.viewWindow.bottom = this.items.length - 1;
}
}
}
this.redraw();
VerticalMenuView.super_.prototype.focusPrevious.call(this);
};
VerticalMenuView.prototype.focusPreviousPageItem = function () {
//
// Jump to current - up to page size or top
// If already at the top, jump to bottom
//
if (0 === this.focusedItemIndex) {
return this.focusPrevious(); // will jump to bottom
}
const index = Math.max(this.focusedItemIndex - this.dimens.height, 0);
if (index < this.viewWindow.top) {
this.oldDimens = Object.assign({}, this.dimens);
}
this.setFocusItemIndex(index);
return VerticalMenuView.super_.prototype.focusPreviousPageItem.call(this);
};
VerticalMenuView.prototype.focusNextPageItem = function () {
//
// Jump to current + up to page size or bottom
// If already at the bottom, jump to top
//
if (this.items.length - 1 === this.focusedItemIndex) {
return this.focusNext(); // will jump to top
}
const index = Math.min(
this.focusedItemIndex + this.maxVisibleItems,
this.items.length - 1
);
if (index > this.viewWindow.bottom) {
this.oldDimens = Object.assign({}, this.dimens);
this.focusedItemIndex = index;
this.viewWindow = {
top: this.focusedItemIndex,
bottom:
Math.min(
this.focusedItemIndex + this.maxVisibleItems,
this.items.length
) - 1,
};
this.redraw();
} else {
this.setFocusItemIndex(index);
}
return VerticalMenuView.super_.prototype.focusNextPageItem.call(this);
};
VerticalMenuView.prototype.focusFirst = function () {
if (0 < this.viewWindow.top) {
this.oldDimens = Object.assign({}, this.dimens);
}
this.setFocusItemIndex(0);
return VerticalMenuView.super_.prototype.focusFirst.call(this);
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};
VerticalMenuView.prototype.focusLast = function () {
const index = this.items.length - 1;
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if (index > this.viewWindow.bottom) {
this.oldDimens = Object.assign({}, this.dimens);
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this.focusedItemIndex = index;
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this.viewWindow = {
top: this.focusedItemIndex,
bottom:
Math.min(
this.focusedItemIndex + this.maxVisibleItems,
this.items.length
) - 1,
};
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this.redraw();
} else {
this.setFocusItemIndex(index);
}
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return VerticalMenuView.super_.prototype.focusLast.call(this);
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};
VerticalMenuView.prototype.setFocusItems = function (items) {
VerticalMenuView.super_.prototype.setFocusItems.call(this, items);
this.positionCacheExpired = true;
};
VerticalMenuView.prototype.setItemSpacing = function (itemSpacing) {
VerticalMenuView.super_.prototype.setItemSpacing.call(this, itemSpacing);
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this.positionCacheExpired = true;
};
VerticalMenuView.prototype.setPropertyValue = function (propName, value) {
if (propName === 'focusItemAtTop' && _.isBoolean(value)) {
this.focusItemAtTop = value;
}
VerticalMenuView.super_.prototype.setPropertyValue.call(this, propName, value);
};