Press n or j to go to the next uncovered block, b, p or k for the previous block.
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| Title: SlateControls.ts |
| UI overlay for geometry diagrams: reset, maximize, new window. |
| Buttons are canvas-drawn icons overlaid on each Slate canvas. |
| Keyboard shortcuts match the original Java applet: |
| r / space → reset |
| u / return → new window |
| m → maximize/minimize |
+----------------------------------------------------------------------*/
import {Slate} from "./Slate";
interface IInitConfig {
background: string;
title: string;
align?: number;
canvasid?: string;
pivot?: string;
elements: any[];
}
const BTN_SIZE = 20;
const BTN_GAP = 4;
const BTN_MARGIN = 8;
export function createControls(slate: Slate, canvas: HTMLCanvasElement, config: IInitConfig): void {
// Skip in headless/test environments
if (!canvas.parentElement) return;
let controls = new SlateControls(slate, canvas, config);
controls.init();
}
class SlateControls {
private _slate: Slate;
private _canvas: HTMLCanvasElement;
private _config: IInitConfig;
private _wrapper: HTMLDivElement;
private _maximized: boolean = false;
private _savedStyles: {
wrapperPosition: string;
wrapperTop: string;
wrapperLeft: string;
wrapperWidth: string;
wrapperHeight: string;
wrapperZIndex: string;
wrapperBackground: string;
canvasStyleWidth: string;
canvasStyleHeight: string;
canvasAttrWidth: number;
canvasAttrHeight: number;
} = null;
constructor(slate: Slate, canvas: HTMLCanvasElement, config: IInitConfig) {
this._slate = slate;
this._canvas = canvas;
this._config = config;
}
init(): void {
this._wrapper = this.createWrapper();
this.createButtons();
this.addKeyboardShortcuts();
}
private createWrapper(): HTMLDivElement {
let wrapper = document.createElement("div");
wrapper.style.position = "relative";
wrapper.style.display = "inline-block";
// Insert wrapper before canvas, then move canvas into it
this._canvas.parentElement.insertBefore(wrapper, this._canvas);
wrapper.appendChild(this._canvas);
// Make canvas focusable for keyboard shortcuts
this._canvas.setAttribute("tabindex", "0");
this._canvas.style.outline = "none"; // default no outline
this._canvas.addEventListener("focus", () => {
this._canvas.style.outline = "2px solid rgba(66,133,244,0.5)";
});
this._canvas.addEventListener("blur", () => {
this._canvas.style.outline = "none";
});
return wrapper;
}
private createButtons(): void {
let buttons = [
{ draw: drawResetIcon, action: () => this.onReset(), title: "Reset (r)" },
{ draw: drawMaximizeIcon, action: () => this.onMaximize(), title: "Maximize (m)" },
{ draw: drawNewWindowIcon, action: () => this.onNewWindow(), title: "New Window (u)" },
];
for (let i = 0; i < buttons.length; i++) {
let btn = document.createElement("button");
btn.style.position = "absolute";
btn.style.top = BTN_MARGIN + "px";
btn.style.right = (BTN_MARGIN + i * (BTN_SIZE + BTN_GAP)) + "px";
btn.style.width = BTN_SIZE + "px";
btn.style.height = BTN_SIZE + "px";
btn.style.padding = "0";
btn.style.border = "none";
btn.style.cursor = "pointer";
btn.style.background = "rgba(0,0,0,0.12)";
btn.style.borderRadius = "3px";
btn.title = buttons[i].title;
btn.addEventListener("mouseenter", () => {
btn.style.background = "rgba(0,0,0,0.3)";
});
btn.addEventListener("mouseleave", () => {
btn.style.background = "rgba(0,0,0,0.12)";
});
// Draw icon on a small canvas inside the button
let iconCanvas = document.createElement("canvas");
iconCanvas.width = BTN_SIZE;
iconCanvas.height = BTN_SIZE;
iconCanvas.style.display = "block";
let ctx = iconCanvas.getContext("2d");
buttons[i].draw(ctx, BTN_SIZE);
btn.appendChild(iconCanvas);
btn.addEventListener("click", (e) => {
e.stopPropagation();
buttons[i].action();
// Return focus to the main canvas after button click
this._canvas.focus();
});
// Store reference for maximize icon swap
if (i === 1) {
(this as any)._maxBtn = btn;
(this as any)._maxIconCanvas = iconCanvas;
}
this._wrapper.appendChild(btn);
}
}
private addKeyboardShortcuts(): void {
this._canvas.addEventListener("keydown", (e: KeyboardEvent) => {
switch (e.key) {
case "r":
case "R":
case " ":
e.preventDefault();
this.onReset();
break;
case "u":
case "U":
case "Enter":
e.preventDefault();
this.onNewWindow();
break;
case "m":
case "M":
e.preventDefault();
this.onMaximize();
break;
}
});
}
private onReset(): void {
this._slate.reset();
}
private onMaximize(): void {
if (this._maximized) {
this.minimize();
} else {
this.maximize();
}
}
private maximize(): void {
// Save current styles AND canvas width/height attributes. The attrs
// are the canvas bitmap resolution; resizeAndRedraw() overwrites them
// to match the maximized CSS size, so minimize() must restore them.
this._savedStyles = {
wrapperPosition: this._wrapper.style.position,
wrapperTop: this._wrapper.style.top,
wrapperLeft: this._wrapper.style.left,
wrapperWidth: this._wrapper.style.width,
wrapperHeight: this._wrapper.style.height,
wrapperZIndex: this._wrapper.style.zIndex,
wrapperBackground: this._wrapper.style.background,
canvasStyleWidth: this._canvas.style.width,
canvasStyleHeight: this._canvas.style.height,
canvasAttrWidth: this._canvas.width,
canvasAttrHeight: this._canvas.height,
};
// Maximize wrapper to fill viewport
this._wrapper.style.position = "fixed";
this._wrapper.style.top = "0";
this._wrapper.style.left = "0";
this._wrapper.style.width = "100vw";
this._wrapper.style.height = "100vh";
this._wrapper.style.zIndex = "9999";
this._wrapper.style.background = "white";
// Expand canvas to fill wrapper
this._canvas.style.width = "100%";
this._canvas.style.height = "100%";
this.resizeAndRedraw();
this._maximized = true;
this.updateMaximizeIcon();
}
private minimize(): void {
if (!this._savedStyles) return;
// Restore saved styles
this._wrapper.style.position = this._savedStyles.wrapperPosition;
this._wrapper.style.top = this._savedStyles.wrapperTop;
this._wrapper.style.left = this._savedStyles.wrapperLeft;
this._wrapper.style.width = this._savedStyles.wrapperWidth;
this._wrapper.style.height = this._savedStyles.wrapperHeight;
this._wrapper.style.zIndex = this._savedStyles.wrapperZIndex;
this._wrapper.style.background = this._savedStyles.wrapperBackground;
this._canvas.style.width = this._savedStyles.canvasStyleWidth;
this._canvas.style.height = this._savedStyles.canvasStyleHeight;
// Restore the canvas bitmap resolution to match its pre-maximize
// intrinsic size. Without this, the canvas keeps the enlarged
// width/height attributes from the maximize pass and (when style
// width/height are empty) falls back to those attrs for its CSS
// size — leaving the diagram rendered full-width.
this._canvas.width = this._savedStyles.canvasAttrWidth;
this._canvas.height = this._savedStyles.canvasAttrHeight;
this.resizeAndRedraw();
this._maximized = false;
this._savedStyles = null;
this.updateMaximizeIcon();
}
private resizeAndRedraw(): void {
// Sync canvas internal resolution to CSS size
let w = this._canvas.clientWidth;
let h = this._canvas.clientHeight;
if (this._canvas.width !== w || this._canvas.height !== h) {
this._canvas.width = w;
this._canvas.height = h;
}
this._slate.update();
}
private updateMaximizeIcon(): void {
let iconCanvas = (this as any)._maxIconCanvas as HTMLCanvasElement;
let btn = (this as any)._maxBtn as HTMLButtonElement;
if (!iconCanvas) return;
let ctx = iconCanvas.getContext("2d");
ctx.clearRect(0, 0, BTN_SIZE, BTN_SIZE);
if (this._maximized) {
drawMinimizeIcon(ctx, BTN_SIZE);
btn.title = "Minimize (m)";
} else {
drawMaximizeIcon(ctx, BTN_SIZE);
btn.title = "Maximize (m)";
}
}
private onNewWindow(): void {
// Find the bundle.js script path from the current page
let scripts = document.querySelectorAll("script[src]");
let bundleSrc = "bundle.js";
for (let i = 0; i < scripts.length; i++) {
let src = (scripts[i] as HTMLScriptElement).src;
if (src.indexOf("bundle.js") >= 0) {
bundleSrc = src;
break;
}
}
// Override the config's canvasid so geomlib.init() targets the
// new window's canvas (id="canvasId"), not the source page's canvas
// which doesn't exist in the new document. Without the override,
// init() would look up this._config.canvasid (e.g. "canvas_0") in
// the new document, get null, and throw in resizeCanvasToDisplaySize.
let newWinConfig = Object.assign({}, this._config, { canvasid: "canvasId" });
let configJSON = JSON.stringify(newWinConfig);
let title = this._config.title || "Geometry";
// Open maximized: use full screen dimensions, canvas fills viewport
let html = `<!DOCTYPE html>
<html><head><title>${title}</title></head>
<body style="margin:0;padding:0;overflow:hidden;">
<canvas id="canvasId" style="width:100vw;height:100vh;"></canvas>
<script src="${bundleSrc}"><\/script>
<script>geomlib.init(${configJSON});<\/script>
</body></html>`;
let newWin = window.open("", "_blank");
if (newWin) {
newWin.document.write(html);
newWin.document.close();
}
}
}
// --- Icon drawing functions ---
// All draw on a size×size canvas with 3px padding
function drawResetIcon(ctx: CanvasRenderingContext2D, size: number): void {
let cx = size / 2;
let cy = size / 2;
let r = size * 0.32;
let pad = 2;
ctx.strokeStyle = "rgba(0,0,0,0.7)";
ctx.fillStyle = "rgba(0,0,0,0.7)";
ctx.lineWidth = 1.5;
// Circular arc (270 degrees)
ctx.beginPath();
ctx.arc(cx, cy, r, -Math.PI * 0.5, Math.PI * 0.75);
ctx.stroke();
// Arrowhead at the end of the arc
let endAngle = Math.PI * 0.75;
let ax = cx + r * Math.cos(endAngle);
let ay = cy + r * Math.sin(endAngle);
let headLen = 4;
let a1 = endAngle + Math.PI * 0.3;
let a2 = endAngle + Math.PI * 0.9;
ctx.beginPath();
ctx.moveTo(ax, ay);
ctx.lineTo(ax + headLen * Math.cos(a1), ay + headLen * Math.sin(a1));
ctx.lineTo(ax + headLen * Math.cos(a2), ay + headLen * Math.sin(a2));
ctx.closePath();
ctx.fill();
}
function drawMaximizeIcon(ctx: CanvasRenderingContext2D, size: number): void {
let pad = 4;
let s = size - pad * 2;
ctx.strokeStyle = "rgba(0,0,0,0.7)";
ctx.fillStyle = "rgba(0,0,0,0.7)";
ctx.lineWidth = 1.5;
// Top-right outward arrow
let ax = pad + s * 0.55;
let ay = pad + s * 0.45;
let bx = pad + s;
let by = pad;
ctx.beginPath();
ctx.moveTo(ax, ay);
ctx.lineTo(bx, by);
ctx.stroke();
// Arrowhead
ctx.beginPath();
ctx.moveTo(bx, by);
ctx.lineTo(bx - 5, by);
ctx.lineTo(bx, by + 5);
ctx.closePath();
ctx.fill();
// Bottom-left outward arrow
ax = pad + s * 0.45;
ay = pad + s * 0.55;
bx = pad;
by = pad + s;
ctx.beginPath();
ctx.moveTo(ax, ay);
ctx.lineTo(bx, by);
ctx.stroke();
ctx.beginPath();
ctx.moveTo(bx, by);
ctx.lineTo(bx + 5, by);
ctx.lineTo(bx, by - 5);
ctx.closePath();
ctx.fill();
}
function drawMinimizeIcon(ctx: CanvasRenderingContext2D, size: number): void {
let pad = 4;
let s = size - pad * 2;
ctx.strokeStyle = "rgba(0,0,0,0.7)";
ctx.fillStyle = "rgba(0,0,0,0.7)";
ctx.lineWidth = 1.5;
// Top-right inward arrow
let ax = pad + s;
let ay = pad;
let bx = pad + s * 0.55;
let by = pad + s * 0.45;
ctx.beginPath();
ctx.moveTo(ax, ay);
ctx.lineTo(bx, by);
ctx.stroke();
ctx.beginPath();
ctx.moveTo(bx, by);
ctx.lineTo(bx + 5, by);
ctx.lineTo(bx, by - 5);
ctx.closePath();
ctx.fill();
// Bottom-left inward arrow
ax = pad;
ay = pad + s;
bx = pad + s * 0.45;
by = pad + s * 0.55;
ctx.beginPath();
ctx.moveTo(ax, ay);
ctx.lineTo(bx, by);
ctx.stroke();
ctx.beginPath();
ctx.moveTo(bx, by);
ctx.lineTo(bx - 5, by);
ctx.lineTo(bx, by + 5);
ctx.closePath();
ctx.fill();
}
function drawNewWindowIcon(ctx: CanvasRenderingContext2D, size: number): void {
let pad = 4;
let s = size - pad * 2;
ctx.strokeStyle = "rgba(0,0,0,0.7)";
ctx.fillStyle = "rgba(0,0,0,0.7)";
ctx.lineWidth = 1.5;
// Small rectangle (the window)
let rx = pad;
let ry = pad + s * 0.3;
let rw = s * 0.65;
let rh = s * 0.7;
ctx.strokeRect(rx, ry, rw, rh);
// Arrow pointing up-right out of the rectangle
let arrowStartX = pad + s * 0.4;
let arrowStartY = pad + s * 0.6;
let arrowEndX = pad + s;
let arrowEndY = pad;
ctx.beginPath();
ctx.moveTo(arrowStartX, arrowStartY);
ctx.lineTo(arrowEndX, arrowEndY);
ctx.stroke();
// Arrowhead
ctx.beginPath();
ctx.moveTo(arrowEndX, arrowEndY);
ctx.lineTo(arrowEndX - 5, arrowEndY);
ctx.lineTo(arrowEndX, arrowEndY + 5);
ctx.closePath();
ctx.fill();
}
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