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Add fullscreen mode for mermaid diagrams #365

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183 changes: 183 additions & 0 deletions src/shared-mermaid/diagramManager.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -254,6 +254,7 @@ export class DiagramElement {
<button class="zoom-out-btn" title="Zoom Out"><span class="codicon codicon-zoom-out"></span></button>
<button class="zoom-in-btn" title="Zoom In"><span class="codicon codicon-zoom-in"></span></button>
<button class="zoom-reset-btn" title="Reset Zoom"><span class="codicon codicon-screen-normal"></span></button>
<button class="fullscreen-btn" title="Fullscreen"><span class="codicon codicon-screen-full"></span></button>
`;

this.panModeButton = controls.querySelector('.pan-mode-btn');
Expand All @@ -277,6 +278,11 @@ export class DiagramElement {
e.stopPropagation();
this.reset();
}, { signal });
controls.querySelector('.fullscreen-btn')?.addEventListener('click', e => {
e.preventDefault();
e.stopPropagation();
this.openFullscreen();
}, { signal });

this.container.appendChild(controls);
}
Expand Down Expand Up @@ -543,6 +549,183 @@ export class DiagramElement {
this.applyTransform();
}

private openFullscreen(): void {
const svg = this.content.querySelector('svg');
if (!svg) {
return;
}

const clonedSvg = svg.cloneNode(true) as SVGElement;

const ac = new AbortController();
const signal = ac.signal;

// Build overlay DOM
const overlay = document.createElement('div');
overlay.className = 'mermaid-fullscreen-overlay';

const header = document.createElement('div');
header.className = 'mermaid-fullscreen-header';

const toolbar = document.createElement('div');
toolbar.className = 'mermaid-fullscreen-toolbar';
toolbar.innerHTML = `
<button class="zoom-out-btn" title="Zoom Out"><span class="codicon codicon-zoom-out"></span></button>
<button class="zoom-in-btn" title="Zoom In"><span class="codicon codicon-zoom-in"></span></button>
<button class="zoom-reset-btn" title="Reset Zoom"><span class="codicon codicon-screen-normal"></span></button>
`;

const closeBtn = document.createElement('button');
closeBtn.className = 'mermaid-fullscreen-close';
closeBtn.title = 'Close';
closeBtn.innerHTML = '<span class="codicon codicon-close"></span>';

header.appendChild(toolbar);
header.appendChild(closeBtn);

const viewport = document.createElement('div');
viewport.className = 'mermaid-fullscreen-viewport';

const contentEl = document.createElement('div');
contentEl.className = 'mermaid-fullscreen-content';
contentEl.appendChild(clonedSvg);

viewport.appendChild(contentEl);
overlay.appendChild(header);
overlay.appendChild(viewport);

// Pan/zoom state
let fsScale = 1;
let fsTranslate = { x: 0, y: 0 };
let fsPanning = false;
let fsStartX = 0;
let fsStartY = 0;

const applyFsTransform = () => {
contentEl.style.transform = `translate(${fsTranslate.x}px, ${fsTranslate.y}px) scale(${fsScale})`;
};

const fsZoomAtPoint = (factor: number, x: number, y: number) => {
const newScale = Math.min(maxScale, Math.max(minScale, fsScale * factor));
const scaleFactor = newScale / fsScale;
fsTranslate = {
x: x - (x - fsTranslate.x) * scaleFactor,
y: y - (y - fsTranslate.y) * scaleFactor,
};
fsScale = newScale;
applyFsTransform();
};

const close = () => {
ac.abort();
overlay.remove();
};

// Close handlers
closeBtn.addEventListener('click', close, { signal });
document.addEventListener('keydown', e => {
if (e.key === 'Escape') {
close();
}
}, { signal });

// Toolbar buttons
toolbar.querySelector('.zoom-out-btn')?.addEventListener('click', () => {
const rect = viewport.getBoundingClientRect();
fsZoomAtPoint(0.8, rect.width / 2, rect.height / 2);
}, { signal });
toolbar.querySelector('.zoom-in-btn')?.addEventListener('click', () => {
const rect = viewport.getBoundingClientRect();
fsZoomAtPoint(1.25, rect.width / 2, rect.height / 2);
}, { signal });
toolbar.querySelector('.zoom-reset-btn')?.addEventListener('click', () => {
fsScale = 1;
fsTranslate = { x: 0, y: 0 };
fitAndCenter();
}, { signal });

// Mouse drag panning (always on)
viewport.addEventListener('mousedown', e => {
if (e.button !== 0) return;
e.preventDefault();
fsPanning = true;
fsStartX = e.clientX - fsTranslate.x;
fsStartY = e.clientY - fsTranslate.y;
viewport.style.cursor = 'grabbing';
}, { signal });

document.addEventListener('mousemove', e => {
if (!fsPanning) return;
if (e.buttons === 0) {
fsPanning = false;
viewport.style.cursor = '';
return;
}
fsTranslate = {
x: e.clientX - fsStartX,
y: e.clientY - fsStartY,
};
applyFsTransform();
}, { signal });

document.addEventListener('mouseup', () => {
if (fsPanning) {
fsPanning = false;
viewport.style.cursor = '';
}
}, { signal });

// Wheel zoom (always on)
viewport.addEventListener('wheel', e => {
e.preventDefault();
const rect = viewport.getBoundingClientRect();
const mouseX = e.clientX - rect.left;
const mouseY = e.clientY - rect.top;

const isPinch = e.ctrlKey;
const pinchMultiplier = isPinch ? 10 : 1;
const delta = -e.deltaY * zoomFactor * pinchMultiplier;
const newScale = Math.min(maxScale, Math.max(minScale, fsScale * (1 + delta)));

const scaleFactor = newScale / fsScale;
fsTranslate = {
x: mouseX - (mouseX - fsTranslate.x) * scaleFactor,
y: mouseY - (mouseY - fsTranslate.y) * scaleFactor,
};
fsScale = newScale;
applyFsTransform();
}, { passive: false, signal });

// Fit & center on open
const fitAndCenter = () => {
const vpRect = viewport.getBoundingClientRect();
// Temporarily reset transform to measure SVG
contentEl.style.transform = 'none';
const svgRect = clonedSvg.getBoundingClientRect();
const svgW = svgRect.width;
const svgH = svgRect.height;

if (svgW === 0 || svgH === 0) {
applyFsTransform();
return;
}

const padding = 40;
const availW = vpRect.width - padding * 2;
const availH = vpRect.height - padding * 2;

fsScale = Math.min(1, availW / svgW, availH / svgH);
fsTranslate = {
x: (vpRect.width - svgW * fsScale) / 2,
y: (vpRect.height - svgH * fsScale) / 2,
};
applyFsTransform();
};

document.body.appendChild(overlay);
requestAnimationFrame(fitAndCenter);
}

public reset(): void {
this.scale = 1;
this.translate = { x: 0, y: 0 };
Expand Down
64 changes: 64 additions & 0 deletions src/shared-mermaid/diagramStyles.css
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Original file line number Diff line number Diff line change
Expand Up @@ -97,3 +97,67 @@
opacity: 1;
transition-delay: 0.3s;
}

/* Fullscreen overlay */

.mermaid-fullscreen-overlay {
position: fixed;
inset: 0;
z-index: 10000;
display: flex;
flex-direction: column;
background: var(--vscode-editor-background);
}

.mermaid-fullscreen-header {
display: flex;
flex-direction: row;
justify-content: space-between;
align-items: center;
padding: 4px 8px;
background: var(--vscode-editorWidget-background);
border-bottom: 1px solid var(--vscode-editorWidget-border, transparent);
}

.mermaid-fullscreen-toolbar {
display: flex;
flex-direction: row;
gap: 2px;
}

.mermaid-fullscreen-toolbar button,
.mermaid-fullscreen-close {
display: flex;
align-items: center;
justify-content: center;
width: 22px;
height: 22px;
background: transparent;
color: var(--vscode-icon-foreground);
border: none;
border-radius: 4px;
cursor: pointer;
}

.mermaid-fullscreen-toolbar button:hover,
.mermaid-fullscreen-close:hover {
background: var(--vscode-toolbar-hoverBackground);
}

.mermaid-fullscreen-close:hover {
color: var(--vscode-errorForeground);
}

.mermaid-fullscreen-viewport {
flex: 1;
overflow: hidden;
cursor: grab;
}

.mermaid-fullscreen-viewport:active {
cursor: grabbing;
}

.mermaid-fullscreen-content {
transform-origin: 0 0;
}