106 lines
3.0 KiB
TypeScript
106 lines
3.0 KiB
TypeScript
/// <reference no-default-lib="true"/>
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/**
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* Reading and writing data to the console output.
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*/
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//% weight=12 color=#00451A icon="\uf112"
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//% advanced=true
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namespace console {
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type Listener = (text: string) => void;
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const listeners: Listener[] = [
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(text: string) => serial.writeLine(text)
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];
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/**
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* Write a line of text to the console output.
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* @param value to send
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*/
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//% weight=90
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//% help=console/log blockGap=8
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//% blockId=console_log block="console|log %text"
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export function log(text: string): void {
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for (let i = 0; i < listeners.length; ++i)
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listeners[i](text);
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}
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/**
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* Write a name:value pair as a line of text to the console output.
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* @param name name of the value stream, eg: "x"
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* @param value to write
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*/
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//% weight=88 blockGap=8
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//% help=console/log-value
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//% blockId=console_log_value block="console|log value %name|= %value"
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export function logValue(name: string, value: number): void {
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log(`${name}: ${value}`)
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}
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/**
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* Adds a listener for the log messages
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* @param listener
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*/
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//%
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export function addListener(listener: (text: string) => void) {
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if (!listener) return;
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listeners.push(listener);
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}
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/**
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* Sends the log messages to the brick screen and uses the brick up and down buttons to scroll.
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*/
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//% blockId=logsendtostreen block="send console to screen"
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//% weight=1
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export function sendToScreen(): void {
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console.screen.attach();
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}
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}
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namespace console.screen {
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const maxLines = 100;
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const screenLines = 8;
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let lines: string[];
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let scrollPosition = 0;
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export function attach() {
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if (!lines) {
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lines = [];
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console.addListener(log);
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brick.buttonUp.onEvent(ButtonEvent.Click, () => scroll(-1))
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brick.buttonDown.onEvent(ButtonEvent.Click, () => scroll(1))
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}
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}
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function printLog() {
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brick.clearScreen()
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if (!lines) return;
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for (let i = 0; i < screenLines; ++i) {
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const line = lines[i + scrollPosition];
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if (line)
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brick.print(line, 0, 4 + i * brick.LINE_HEIGHT)
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}
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}
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function scroll(pos: number) {
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if (!pos) return;
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scrollPosition += pos >> 0;
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if (scrollPosition >= lines.length) scrollPosition = lines.length - 1;
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if (scrollPosition < 0) scrollPosition = 0;
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printLog();
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}
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function log(msg: string): void {
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lines.push(msg);
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if (lines.length + 5 > maxLines) {
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lines.splice(0, maxLines - lines.length);
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scrollPosition = Math.min(scrollPosition, lines.length - 1)
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}
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// move down scroll once it gets large than the screen
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if (lines.length > screenLines
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&& lines.length >= scrollPosition + screenLines) {
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scrollPosition++;
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}
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printLog();
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}
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} |