70 lines
2.5 KiB
JavaScript
70 lines
2.5 KiB
JavaScript
const MARGIN_VERTICAL = 14;
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/** Sets the editor position and determines a proper orientation **/
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const setPosition = (wrapperEl, editorEl, selectedEl, autoPosition) => {
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// Container element bounds
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const containerBounds = wrapperEl.getBoundingClientRect();
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// Re-set orientation class
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editorEl.className = 'r6o-editor r6o-arrow-top r6o-arrow-left';
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// Default orientation (upwards arrow, at bottom-left of shape)
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const { left, top, right, bottom } = selectedEl.getBoundingClientRect();
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editorEl.style.top = `${bottom - containerBounds.top + MARGIN_VERTICAL}px`;
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editorEl.style.left = `${left - containerBounds.left}px`;
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if (autoPosition) {
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const defaultOrientation = editorEl.children[1].getBoundingClientRect();
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const { innerWidth, innerHeight } = wrapperEl.ownerDocument.defaultView;
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// Test 1: does right edge extend beyond the width of the page?
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// If so, flip horizontally
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if (defaultOrientation.right > innerWidth) {
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editorEl.classList.remove('r6o-arrow-left');
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editorEl.classList.add('r6o-arrow-right');
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editorEl.style.left = `${right - defaultOrientation.width - containerBounds.left}px`;
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}
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// Test 2: does the bottom edge extend beyond the height of the page?
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// If so, flip vertically
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if (defaultOrientation.bottom > innerHeight) {
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editorEl.classList.remove('r6o-arrow-top');
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editorEl.classList.add('r6o-arrow-bottom');
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const editorHeight = editorEl.children[1].getBoundingClientRect().height;
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editorEl.style.top = `${top - containerBounds.top - editorHeight - MARGIN_VERTICAL}px`;
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}
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// Get bounding box in current orientation for next tests
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const currentOrientation = editorEl.children[1].getBoundingClientRect();
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// Test 3: does the top (still?) extend beyond top of the page?
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// If so, push it down
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if (currentOrientation.top < 0) {
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editorEl.classList.add('pushed', 'down');
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editorEl.style.top = `${-containerBounds.top}px`;
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const shapeBottom = bottom - containerBounds.top;
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const editorBottom = currentOrientation.height - containerBounds.top;
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if (editorBottom > shapeBottom)
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editorEl.classList.remove('r6o-arrow-bottom');
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}
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// Test 4: does the left edge extend beyond the start of the page?
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// If so, push inward
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if (currentOrientation.left < 0) {
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editorEl.classList.add('pushed', 'right');
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editorEl.style.left = `${-containerBounds.left}px`;
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}
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// Make visible
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requestAnimationFrame(() =>
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editorEl.style.opacity = 1);
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}
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}
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export default setPosition;
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