61 lines
1.8 KiB
TypeScript
61 lines
1.8 KiB
TypeScript
namespace console {
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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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//% help=console/send-to-screen
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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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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.Bumped, () => scroll(-3))
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brick.buttonDown.onEvent(ButtonEvent.Bumped, () => scroll(3))
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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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const screenLines = brick.lineCount();
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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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screen.print(line, 0, 4 + i * brick.lineHeight(), 1, brick.font)
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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(priority: ConsolePriority, 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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const screenLines = brick.lineCount();
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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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} |