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Copy pathmenu.ts
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354 lines (329 loc) · 11.4 KB
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import { G2_LENS_HEIGHT, G2_LENS_WIDTH, GrayImage } from "../graphics/image";
import { wrapText } from "../graphics/textwrap";
import { getDefaultSmallFont, type BdfFont } from "../graphics/bdffont";
import { clamp } from "../util/numeric-util";
import { DashboardInputEvent, Layer, LayerContext, PaintBelow } from "./layers";
import { GESTURE_DOUBLE_CLICK } from "./gestures";
const DEFAULT_MENU_X = 8;
const DEFAULT_MENU_Y = 8;
const DEFAULT_MENU_WIDTH = 272;
// Menus grow with their item count, from half the screen (matching the old
// fixed quarter-screen-era look) up to the full screen, then scroll.
const DEFAULT_MENU_MIN_HEIGHT = G2_LENS_HEIGHT / 2 - 2 * DEFAULT_MENU_Y;
const MENU_TITLE_HEIGHT = 16;
const MENU_ROW_HEIGHT = 20;
const MENU_BODY_PADDING = 8;
const MENU_HIGHLIGHT_Y_OFFSET = 0;
const MENU_TOGGLE_SWITCH_Y_OFFSET = 1;
const MENU_HIGHLIGHT_HEIGHT = MENU_ROW_HEIGHT - 1;
const MENU_HIGHLIGHT_SELECTED_BACKGROUND_FILL = 15;
const MENU_HIGHLIGHT_SELECTED_BORDER_STROKE = 45;
export type MenuLayout = {
x: number;
y: number;
width: number;
/** Smallest box to draw even when items don't fill it. Default: top half of the screen. */
minHeight?: number;
/** Height cap before the menu starts scrolling. Default: the full screen. */
maxHeight?: number;
};
export type MenuItemRenderArgs = {
image: GrayImage;
x: number;
y: number;
width: number;
height: number;
selected: boolean;
disabled: boolean;
text: string;
ctx: LayerContext;
};
export type MenuItem = {
label: string;
/** Extended description; the Settings panel shows it below the list while the item is selected. */
description?: string;
/** Disabled rows stay visible but render dimly and ignore clicks. */
disabled?: boolean | (() => boolean);
onSelect: (ctx: LayerContext, menu: MenuLayer) => Promise<void> | void;
render?: (args: MenuItemRenderArgs) => void;
};
/**
* Draw a selection highlight for a list row. A focused list fills the row and
* outlines it; a visible-but-unfocused list draws only the outline, so the
* selection stays legible without implying it will receive input.
*/
export function drawSelectionHighlight(
image: GrayImage,
x: number,
y: number,
width: number,
height: number,
focused: boolean,
radius = 6,
): void {
if (focused) {
image.fillRoundedRect(x, y, width, height, MENU_HIGHLIGHT_SELECTED_BACKGROUND_FILL, radius);
}
image.drawRoundedRect(x, y, width, height, MENU_HIGHLIGHT_SELECTED_BORDER_STROKE, radius);
}
/**
* Move a list's scroll position the minimum distance needed to keep the
* selected row inside the visible window, clamped to the list bounds.
* Returns the new scroll row (the index of the first visible item).
*/
export function scrollToKeepSelectionVisible(
scrollRow: number,
selectedIndex: number,
visibleRowCount: number,
itemCount: number,
): number {
if (selectedIndex < scrollRow) {
scrollRow = selectedIndex;
} else if (selectedIndex >= scrollRow + visibleRowCount) {
scrollRow = selectedIndex - visibleRowCount + 1;
}
return clamp(scrollRow, 0, Math.max(0, itemCount - visibleRowCount));
}
/**
* Draw a vertical scrollbar beside a row-scrolled list: a dim track with a
* proportional thumb positioned by scroll fraction. Only call when the list
* actually overflows (itemCount > visibleRowCount).
*/
export function drawListScrollbar(
image: GrayImage,
trackX: number,
trackY: number,
trackHeight: number,
scrollRow: number,
visibleRowCount: number,
itemCount: number,
): void {
image.fillRect(trackX, trackY, 3, trackHeight, 30);
const thumbHeight = Math.max(8, (trackHeight * visibleRowCount / itemCount) | 0);
const maxScrollRow = Math.max(1, itemCount - visibleRowCount);
const thumbY = trackY + (((trackHeight - thumbHeight) * clamp(scrollRow, 0, maxScrollRow) / maxScrollRow) | 0);
image.fillRect(trackX, thumbY, 3, thumbHeight, 120);
}
/**
* Draw a ">" submenu indicator inset at the right edge of a row's selection
* highlight box, vertically centered within it. Pass the same rect as the
* row's drawSelectionHighlight call (the row need not actually be selected).
*/
export function drawSubmenuIndicator(
image: GrayImage,
font: BdfFont,
highlightX: number,
highlightY: number,
highlightWidth: number,
highlightHeight: number,
value: number,
): void {
const arrow = ">";
const x = highlightX + highlightWidth - font.measureText(arrow) - 4;
const y = highlightY + (((highlightHeight - font.lineHeight) / 2) | 0);
image.drawText(font, x, y, arrow, value);
}
export function drawToggleMenuItem(
image: GrayImage,
font: BdfFont,
x: number,
y: number,
width: number,
label: string,
enabled: boolean,
selected: boolean,
): void {
const switchWidth = 34;
const switchHeight = 16;
const switchX = x + width - switchWidth - 2;
const switchY = y + MENU_TOGGLE_SWITCH_Y_OFFSET;
image.drawText(font, x, y + 3, label, 200);
const offFill = selected ? 1 : 18;
image.fillRoundedRect(switchX, switchY, switchWidth, switchHeight, enabled ? 70 : offFill, 8);
image.drawRoundedRect(switchX, switchY, switchWidth, switchHeight, enabled ? 130 : 55, 8);
const knobSize = 12;
const knobX = enabled ? switchX + switchWidth - knobSize - 2 : switchX + 2;
image.fillRoundedRect(knobX, switchY + 2, knobSize, knobSize, enabled ? 230 : selected ? 170 : 90, 6);
}
export function drawRightValueMenuItem(
image: GrayImage,
font: BdfFont,
x: number,
y: number,
width: number,
label: string,
value: string,
): void {
image.drawText(font, x, y + 3, label, 200);
const valueX = x + width - font.measureText(value) - 2;
image.drawText(font, valueX, y + 3, value, 220);
}
export class MenuLayer implements Layer {
private selectedIndex = 0;
private scrollRow = 0;
constructor(
private readonly title: string | null,
private readonly items: MenuItem[],
private readonly layout: MenuLayout = {
x: DEFAULT_MENU_X,
y: DEFAULT_MENU_Y,
width: DEFAULT_MENU_WIDTH,
},
public readonly paintOverBase = false,
) {}
/** Start a newly opened picker on its current value. */
selectItem(index: number): this {
this.selectedIndex = clamp(index, 0, Math.max(0, this.items.length - 1));
return this;
}
paint(ctx: LayerContext, paintBelow: PaintBelow): GrayImage {
const font = getDefaultSmallFont();
const image = paintBelow();
const { x, y, width } = this.layout;
const chromeTop = (this.title ? MENU_TITLE_HEIGHT : 0) + MENU_BODY_PADDING;
const minHeight = this.layout.minHeight ?? DEFAULT_MENU_MIN_HEIGHT;
// Cap to the surface being painted on: a window's stack image may be much
// shorter than the full screen (min-height windows).
const maxHeight = Math.min(
this.layout.maxHeight ?? image.height - y - DEFAULT_MENU_Y,
image.height - y,
);
const contentHeight = chromeTop + this.items.length * MENU_ROW_HEIGHT + MENU_BODY_PADDING;
const height = clamp(contentHeight, Math.min(minHeight, maxHeight), maxHeight);
const visibleRowCount = Math.max(1, ((height - chromeTop - MENU_BODY_PADDING) / MENU_ROW_HEIGHT) | 0);
this.scrollRow = scrollToKeepSelectionVisible(
this.scrollRow,
this.selectedIndex,
visibleRowCount,
this.items.length,
);
// Fill 1, not 0: identical after 4bpp quantization, but 0 is the
// transparent color key when a menu paints on the shell surface.
image.fillRoundedRect(x, y, width, height, 1);
image.drawRoundedRect(x, y, width, height, 72);
if (this.title) {
image.drawText(font, x + 12, y + 8, this.title, 220);
}
const bodyY = y + chromeTop;
const focused = ctx.stack.isFocused();
const lastVisibleRow = Math.min(this.items.length, this.scrollRow + visibleRowCount);
for (let index = this.scrollRow; index < lastVisibleRow; index++) {
const item = this.items[index]!;
const rowY = bodyY + (index - this.scrollRow) * MENU_ROW_HEIGHT;
const selected = index === this.selectedIndex;
const disabled = isMenuItemDisabled(item);
if (selected) {
drawSelectionHighlight(
image,
x + 12,
rowY + MENU_HIGHLIGHT_Y_OFFSET,
width - 24,
MENU_HIGHLIGHT_HEIGHT,
focused,
8,
);
}
if (item.render) {
item.render({
image,
x: x + 22,
y: rowY,
width: width - 44,
height: MENU_ROW_HEIGHT - 3,
selected,
disabled,
text: item.label,
ctx,
});
} else {
image.drawText(font, x + 22, rowY + 3, item.label, disabled ? 70 : selected ? 255 : 200);
}
}
if (this.items.length > visibleRowCount) {
drawListScrollbar(
image,
x + width - 7,
bodyY,
visibleRowCount * MENU_ROW_HEIGHT - 4,
this.scrollRow,
visibleRowCount,
this.items.length,
);
}
return image;
}
async handleInput(event: DashboardInputEvent, ctx: LayerContext): Promise<void> {
if (!this.items.length) {
if (event.type === "double-click") {
ctx.stack.pop();
}
return;
}
switch (event.type) {
case "scroll-up":
this.selectedIndex = (this.selectedIndex + this.items.length - 1) % this.items.length;
return;
case "scroll-down":
this.selectedIndex = (this.selectedIndex + 1) % this.items.length;
return;
case "double-click":
ctx.stack.pop();
return;
case "click":
if (!isMenuItemDisabled(this.items[this.selectedIndex]!)) {
await this.items[this.selectedIndex]!.onSelect(ctx, this);
}
return;
default:
return;
}
}
}
/** Open a centered, bordered menu over the current layer. */
export function openModalMenu(
ctx: LayerContext,
title: string,
items: MenuItem[],
initialSelectedIndex = 0,
): void {
const { width, height } = ctx.stack.getBaseSize();
const menuWidth = Math.min(320, width - 40);
const naturalHeight = MENU_TITLE_HEIGHT + 2 * MENU_BODY_PADDING + items.length * MENU_ROW_HEIGHT;
const menuHeight = Math.min(naturalHeight, height - 40);
const layout: MenuLayout = {
x: ((width - menuWidth) / 2) | 0,
y: ((height - menuHeight) / 2) | 0,
width: menuWidth,
minHeight: menuHeight,
maxHeight: menuHeight,
};
ctx.stack.push(new MenuLayer(title, items, layout).selectItem(initialSelectedIndex));
}
export function isMenuItemDisabled(item: MenuItem): boolean {
return typeof item.disabled === "function" ? item.disabled() : item.disabled === true;
}
export class TextPageLayer implements Layer {
constructor(
private readonly title: string,
private readonly body: string,
) {}
paint(ctx: LayerContext): GrayImage {
const font = getDefaultSmallFont();
const image = new GrayImage(G2_LENS_WIDTH, G2_LENS_HEIGHT, 0);
image.drawText(font, 18, 14, this.title, 220);
image.drawRect(12, 12, G2_LENS_WIDTH - 24, G2_LENS_HEIGHT - 24, 52);
const wrapped = wrapText(font, this.body, G2_LENS_WIDTH - 60);
const footerY = G2_LENS_HEIGHT - 48;
const maxBodyLines = Math.max(0, Math.floor((footerY - 50) / 14));
for (let index = 0; index < Math.min(wrapped.length, maxBodyLines); index++) {
image.
38A3
drawText(font, 24, 42 + index * 14, wrapped[index]!, 190);
}
image.drawText(font, 24, footerY, `${GESTURE_DOUBLE_CLICK} back`, 110);
return image;
}
handleInput(event: DashboardInputEvent, ctx: LayerContext): void {
if (event.type === "double-click") {
ctx.stack.pop();
}
}
}