ng-zorro-antd
Version:
An enterprise-class UI components based on Ant Design and Angular
205 lines • 35 kB
JavaScript
/**
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE
*/
import { drag } from 'd3-drag';
import { pointer, select } from 'd3-selection';
import { zoomIdentity } from 'd3-zoom';
const FRAC_VIEWPOINT_AREA = 0.8;
export class Minimap {
constructor(svg, zoomG, mainZoom, minimap, maxWidth, labelPadding) {
this.svg = svg;
this.labelPadding = labelPadding;
this.zoomG = zoomG;
this.mainZoom = mainZoom;
this.maxWidth = maxWidth;
const minimapElement = select(minimap);
const minimapSvgElement = minimapElement.select('svg');
const viewpointElement = minimapSvgElement.select('rect');
this.canvas = minimapElement.select('canvas.viewport').node();
this.canvasRect = this.canvas.getBoundingClientRect();
const handleEvent = (event) => {
const minimapOffset = this.minimapOffset();
const width = Number(viewpointElement.attr('width'));
const height = Number(viewpointElement.attr('height'));
const clickCoords = pointer(event, minimapSvgElement.node());
this.viewpointCoord.x = clickCoords[0] - width / 2 - minimapOffset.x;
this.viewpointCoord.y = clickCoords[1] - height / 2 - minimapOffset.y;
this.updateViewpoint();
};
this.viewpointCoord = { x: 0, y: 0 };
const dragEvent = drag().subject(Object).on('drag', handleEvent);
viewpointElement.datum(this.viewpointCoord).call(dragEvent);
// Make the minimap clickable.
minimapSvgElement.on('click', event => {
if (event.defaultPrevented) {
// This click was part of a drag event, so suppress it.
return;
}
handleEvent(event);
});
this.viewpoint = viewpointElement.node();
this.minimapSvg = minimapSvgElement.node();
this.minimap = minimap;
this.canvasBuffer = minimapElement.select('canvas.buffer').node();
this.update();
}
minimapOffset() {
return {
x: (this.canvasRect.width - this.minimapSize.width) / 2,
y: (this.canvasRect.height - this.minimapSize.height) / 2
};
}
updateViewpoint() {
// Update the coordinates of the viewpoint rectangle.
select(this.viewpoint).attr('x', this.viewpointCoord.x).attr('y', this.viewpointCoord.y);
// Update the translation vector of the main svg to reflect the
// new viewpoint.
const mainX = (-this.viewpointCoord.x * this.scaleMain) / this.scaleMinimap;
const mainY = (-this.viewpointCoord.y * this.scaleMain) / this.scaleMinimap;
select(this.svg).call(this.mainZoom.transform, zoomIdentity.translate(mainX, mainY).scale(this.scaleMain));
}
update() {
let sceneSize = null;
try {
// Get the size of the entire scene.
sceneSize = this.zoomG.getBBox();
if (sceneSize.width === 0) {
// There is no scene anymore. We have been detached from the dom.
return;
}
}
catch (e) {
// Firefox produced NS_ERROR_FAILURE if we have been
// detached from the dom.
return;
}
const svgSelection = select(this.svg);
// Read all the style rules in the document and embed them into the svg.
// The svg needs to be self contained, i.e. all the style rules need to be
// embedded so the canvas output matches the origin.
let stylesText = '';
for (const k of new Array(document.styleSheets.length).keys()) {
try {
const cssRules = document.styleSheets[k].cssRules || document.styleSheets[k].rules;
if (cssRules == null) {
continue;
}
for (const i of new Array(cssRules.length).keys()) {
// Remove tf-* selectors from the styles.
stylesText += `${cssRules[i].cssText.replace(/ ?tf-[\w-]+ ?/g, '')}\n`;
}
}
catch (e) {
if (e.name !== 'SecurityError') {
throw e;
}
}
}
// Temporarily add the css rules to the main svg.
const svgStyle = svgSelection.append('style');
svgStyle.text(stylesText);
// Temporarily remove the zoom/pan transform from the main svg since we
// want the minimap to show a zoomed-out and centered view.
const zoomGSelection = select(this.zoomG);
const zoomTransform = zoomGSelection.attr('transform');
zoomGSelection.attr('transform', null);
// Since we add padding, account for that here.
sceneSize.height += this.labelPadding * 2;
sceneSize.width += this.labelPadding * 2;
// Temporarily assign an explicit width/height to the main svg, since
// it doesn't have one (uses flex-box), but we need it for the canvas
// to work.
svgSelection.attr('width', sceneSize.width).attr('height', sceneSize.height);
// Since the content inside the svg changed (e.g. a node was expanded),
// the aspect ratio have also changed. Thus, we need to update the scale
// factor of the minimap. The scale factor is determined such that both
// the width and height of the minimap are <= maximum specified w/h.
this.scaleMinimap = this.maxWidth / Math.max(sceneSize.width, sceneSize.height);
this.minimapSize = {
width: sceneSize.width * this.scaleMinimap,
height: sceneSize.height * this.scaleMinimap
};
const minimapOffset = this.minimapOffset();
// Update the size of the minimap's svg, the buffer canvas and the
// viewpoint rect.
select(this.minimapSvg).attr(this.minimapSize);
select(this.canvasBuffer).attr(this.minimapSize);
if (this.translate != null && this.zoom != null) {
// Update the viewpoint rectangle shape since the aspect ratio of the
// map has changed.
requestAnimationFrame(() => this.zoom());
}
// Serialize the main svg to a string which will be used as the rendering
// content for the canvas.
const svgXml = new XMLSerializer().serializeToString(this.svg);
// Now that the svg is serialized for rendering, remove the temporarily
// assigned styles, explicit width and height and bring back the pan/zoom
// transform.
svgStyle.remove();
svgSelection.attr('width', '100%').attr('height', '100%');
zoomGSelection.attr('transform', zoomTransform);
const image = document.createElement('img');
image.onload = () => {
// Draw the svg content onto the buffer canvas.
const context = this.canvasBuffer.getContext('2d');
context.clearRect(0, 0, this.canvasBuffer.width, this.canvasBuffer.height);
context.drawImage(image, minimapOffset.x, minimapOffset.y, this.minimapSize.width, this.minimapSize.height);
requestAnimationFrame(() => {
// Hide the old canvas and show the new buffer canvas.
select(this.canvasBuffer).style('display', 'block');
select(this.canvas).style('display', 'none');
// Swap the two canvases.
[this.canvas, this.canvasBuffer] = [this.canvasBuffer, this.canvas];
});
};
image.src = `data:image/svg+xml;charset=utf-8,${encodeURIComponent(svgXml)}`;
}
/**
* Handles changes in zooming/panning. Should be called from the main svg
* to notify that a zoom/pan was performed and this minimap will update it's
* viewpoint rectangle.
*
* @param transform
*/
zoom(transform) {
if (this.scaleMinimap == null) {
// Scene is not ready yet.
return;
}
// Update the new translate and scale params, only if specified.
if (transform) {
this.translate = [transform.x, transform.y];
this.scaleMain = transform.k;
}
// Update the location of the viewpoint rectangle.
const svgRect = this.svg.getBoundingClientRect();
const minimapOffset = this.minimapOffset();
const viewpointSelection = select(this.viewpoint);
this.viewpointCoord.x = (-this.translate[0] * this.scaleMinimap) / this.scaleMain;
this.viewpointCoord.y = (-this.translate[1] * this.scaleMinimap) / this.scaleMain;
const viewpointWidth = (svgRect.width * this.scaleMinimap) / this.scaleMain;
const viewpointHeight = (svgRect.height * this.scaleMinimap) / this.scaleMain;
viewpointSelection
.attr('x', this.viewpointCoord.x + minimapOffset.x)
.attr('y', this.viewpointCoord.y + minimapOffset.y)
.attr('width', viewpointWidth)
.attr('height', viewpointHeight);
// Show/hide the minimap depending on the viewpoint area as fraction of the
// whole minimap.
const mapWidth = this.minimapSize.width;
const mapHeight = this.minimapSize.height;
const x = this.viewpointCoord.x;
const y = this.viewpointCoord.y;
const w = Math.min(Math.max(0, x + viewpointWidth), mapWidth) - Math.min(Math.max(0, x), mapWidth);
const h = Math.min(Math.max(0, y + viewpointHeight), mapHeight) - Math.min(Math.max(0, y), mapHeight);
const fracIntersect = (w * h) / (mapWidth * mapHeight);
if (fracIntersect < FRAC_VIEWPOINT_AREA) {
this.minimap.classList.remove('hidden');
}
else {
this.minimap.classList.add('hidden');
}
}
}
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* Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE\n */\n\nimport { drag } from 'd3-drag';\nimport { pointer, select } from 'd3-selection';\nimport { ZoomBehavior, zoomIdentity, ZoomTransform } from 'd3-zoom';\n\nimport { NzSafeAny } from 'ng-zorro-antd/core/types';\n\nimport { NzZoomTransform } from '../interface';\n\nconst FRAC_VIEWPOINT_AREA = 0.8;\n\nexport class Minimap {\n  private minimap: HTMLElement;\n  private canvas: HTMLCanvasElement;\n  private canvasRect: ClientRect;\n  private canvasBuffer: HTMLCanvasElement;\n  private minimapSvg: SVGSVGElement;\n  private viewpoint: SVGRectElement;\n  private scaleMinimap!: number;\n  private scaleMain!: number;\n  private maxWidth: number;\n  private translate!: [number, number];\n  private viewpointCoord: { x: number; y: number };\n  private minimapSize!: { width: number; height: number };\n  private labelPadding: number;\n\n  private svg: SVGSVGElement;\n  private zoomG: SVGGElement;\n  private mainZoom: ZoomBehavior<NzSafeAny, NzSafeAny>;\n\n  constructor(\n    svg: SVGSVGElement,\n    zoomG: SVGGElement,\n    mainZoom: ZoomBehavior<NzSafeAny, NzSafeAny>,\n    minimap: HTMLElement,\n    maxWidth: number,\n    labelPadding: number\n  ) {\n    this.svg = svg;\n    this.labelPadding = labelPadding;\n    this.zoomG = zoomG;\n    this.mainZoom = mainZoom;\n    this.maxWidth = maxWidth;\n    const minimapElement = select(minimap);\n    const minimapSvgElement = minimapElement.select('svg');\n    const viewpointElement = minimapSvgElement.select('rect');\n    this.canvas = minimapElement.select('canvas.viewport').node() as HTMLCanvasElement;\n    this.canvasRect = this.canvas.getBoundingClientRect();\n\n    const handleEvent = (event: NzSafeAny): void => {\n      const minimapOffset = this.minimapOffset();\n      const width = Number(viewpointElement.attr('width'));\n      const height = Number(viewpointElement.attr('height'));\n      const clickCoords = pointer(event, minimapSvgElement.node() as NzSafeAny);\n      this.viewpointCoord.x = clickCoords[0] - width / 2 - minimapOffset.x;\n      this.viewpointCoord.y = clickCoords[1] - height / 2 - minimapOffset.y;\n      this.updateViewpoint();\n    };\n    this.viewpointCoord = { x: 0, y: 0 };\n    const dragEvent = drag().subject(Object).on('drag', handleEvent);\n    viewpointElement.datum(this.viewpointCoord as NzSafeAny).call(dragEvent as NzSafeAny);\n\n    // Make the minimap clickable.\n    minimapSvgElement.on('click', event => {\n      if ((event as Event).defaultPrevented) {\n        // This click was part of a drag event, so suppress it.\n        return;\n      }\n      handleEvent(event);\n    });\n    this.viewpoint = viewpointElement.node() as SVGRectElement;\n    this.minimapSvg = minimapSvgElement.node() as SVGSVGElement;\n    this.minimap = minimap;\n    this.canvasBuffer = minimapElement.select('canvas.buffer').node() as HTMLCanvasElement;\n    this.update();\n  }\n\n  private minimapOffset(): { x: number; y: number } {\n    return {\n      x: (this.canvasRect.width - this.minimapSize.width) / 2,\n      y: (this.canvasRect.height - this.minimapSize.height) / 2\n    };\n  }\n\n  private updateViewpoint(): void {\n    // Update the coordinates of the viewpoint rectangle.\n    select(this.viewpoint).attr('x', this.viewpointCoord.x).attr('y', this.viewpointCoord.y);\n    // Update the translation vector of the main svg to reflect the\n    // new viewpoint.\n    const mainX = (-this.viewpointCoord.x * this.scaleMain) / this.scaleMinimap;\n    const mainY = (-this.viewpointCoord.y * this.scaleMain) / this.scaleMinimap;\n    select(this.svg).call(this.mainZoom.transform, zoomIdentity.translate(mainX, mainY).scale(this.scaleMain));\n  }\n\n  update(): void {\n    let sceneSize = null;\n    try {\n      // Get the size of the entire scene.\n      sceneSize = this.zoomG.getBBox();\n      if (sceneSize.width === 0) {\n        // There is no scene anymore. We have been detached from the dom.\n        return;\n      }\n    } catch (e) {\n      // Firefox produced NS_ERROR_FAILURE if we have been\n      // detached from the dom.\n      return;\n    }\n\n    const svgSelection = select(this.svg);\n    // Read all the style rules in the document and embed them into the svg.\n    // The svg needs to be self contained, i.e. all the style rules need to be\n    // embedded so the canvas output matches the origin.\n    let stylesText = '';\n\n    for (const k of new Array(document.styleSheets.length).keys()) {\n      try {\n        const cssRules =\n          (document.styleSheets[k] as NzSafeAny).cssRules || (document.styleSheets[k] as NzSafeAny).rules;\n        if (cssRules == null) {\n          continue;\n        }\n        for (const i of new Array(cssRules.length).keys()) {\n          // Remove tf-* selectors from the styles.\n          stylesText += `${cssRules[i].cssText.replace(/ ?tf-[\\w-]+ ?/g, '')}\\n`;\n        }\n      } catch (e) {\n        if (e.name !== 'SecurityError') {\n          throw e;\n        }\n      }\n    }\n\n    // Temporarily add the css rules to the main svg.\n    const svgStyle = svgSelection.append('style');\n    svgStyle.text(stylesText);\n\n    // Temporarily remove the zoom/pan transform from the main svg since we\n    // want the minimap to show a zoomed-out and centered view.\n    const zoomGSelection = select(this.zoomG);\n    const zoomTransform = zoomGSelection.attr('transform');\n    zoomGSelection.attr('transform', null);\n\n    // Since we add padding, account for that here.\n    sceneSize.height += this.labelPadding * 2;\n    sceneSize.width += this.labelPadding * 2;\n\n    // Temporarily assign an explicit width/height to the main svg, since\n    // it doesn't have one (uses flex-box), but we need it for the canvas\n    // to work.\n    svgSelection.attr('width', sceneSize.width).attr('height', sceneSize.height);\n\n    // Since the content inside the svg changed (e.g. a node was expanded),\n    // the aspect ratio have also changed. Thus, we need to update the scale\n    // factor of the minimap. The scale factor is determined such that both\n    // the width and height of the minimap are <= maximum specified w/h.\n    this.scaleMinimap = this.maxWidth / Math.max(sceneSize.width, sceneSize.height);\n    this.minimapSize = {\n      width: sceneSize.width * this.scaleMinimap,\n      height: sceneSize.height * this.scaleMinimap\n    };\n\n    const minimapOffset = this.minimapOffset();\n\n    // Update the size of the minimap's svg, the buffer canvas and the\n    // viewpoint rect.\n    select(this.minimapSvg).attr(this.minimapSize as NzSafeAny);\n    select(this.canvasBuffer).attr(this.minimapSize as NzSafeAny);\n\n    if (this.translate != null && this.zoom != null) {\n      // Update the viewpoint rectangle shape since the aspect ratio of the\n      // map has changed.\n      requestAnimationFrame(() => this.zoom());\n    }\n\n    // Serialize the main svg to a string which will be used as the rendering\n    // content for the canvas.\n    const svgXml = new XMLSerializer().serializeToString(this.svg);\n\n    // Now that the svg is serialized for rendering, remove the temporarily\n    // assigned styles, explicit width and height and bring back the pan/zoom\n    // transform.\n    svgStyle.remove();\n    svgSelection.attr('width', '100%').attr('height', '100%');\n\n    zoomGSelection.attr('transform', zoomTransform);\n\n    const image = document.createElement('img');\n    image.onload = () => {\n      // Draw the svg content onto the buffer canvas.\n      const context = this.canvasBuffer.getContext('2d');\n      context!.clearRect(0, 0, this.canvasBuffer.width, this.canvasBuffer.height);\n\n      context!.drawImage(image, minimapOffset.x, minimapOffset.y, this.minimapSize.width, this.minimapSize.height);\n      requestAnimationFrame(() => {\n        // Hide the old canvas and show the new buffer canvas.\n        select(this.canvasBuffer).style('display', 'block');\n        select(this.canvas).style('display', 'none');\n        // Swap the two canvases.\n        [this.canvas, this.canvasBuffer] = [this.canvasBuffer, this.canvas];\n      });\n    };\n    image.src = `data:image/svg+xml;charset=utf-8,${encodeURIComponent(svgXml)}`;\n  }\n\n  /**\n   * Handles changes in zooming/panning. Should be called from the main svg\n   * to notify that a zoom/pan was performed and this minimap will update it's\n   * viewpoint rectangle.\n   *\n   * @param transform\n   */\n  zoom(transform?: ZoomTransform | NzZoomTransform): void {\n    if (this.scaleMinimap == null) {\n      // Scene is not ready yet.\n      return;\n    }\n    // Update the new translate and scale params, only if specified.\n    if (transform) {\n      this.translate = [transform.x, transform.y];\n      this.scaleMain = transform.k;\n    }\n\n    // Update the location of the viewpoint rectangle.\n    const svgRect = this.svg.getBoundingClientRect();\n    const minimapOffset = this.minimapOffset();\n    const viewpointSelection = select(this.viewpoint);\n    this.viewpointCoord.x = (-this.translate[0] * this.scaleMinimap) / this.scaleMain;\n    this.viewpointCoord.y = (-this.translate[1] * this.scaleMinimap) / this.scaleMain;\n    const viewpointWidth = (svgRect.width * this.scaleMinimap) / this.scaleMain;\n    const viewpointHeight = (svgRect.height * this.scaleMinimap) / this.scaleMain;\n    viewpointSelection\n      .attr('x', this.viewpointCoord.x + minimapOffset.x)\n      .attr('y', this.viewpointCoord.y + minimapOffset.y)\n      .attr('width', viewpointWidth)\n      .attr('height', viewpointHeight);\n    // Show/hide the minimap depending on the viewpoint area as fraction of the\n    // whole minimap.\n    const mapWidth = this.minimapSize.width;\n    const mapHeight = this.minimapSize.height;\n    const x = this.viewpointCoord.x;\n    const y = this.viewpointCoord.y;\n    const w = Math.min(Math.max(0, x + viewpointWidth), mapWidth) - Math.min(Math.max(0, x), mapWidth);\n    const h = Math.min(Math.max(0, y + viewpointHeight), mapHeight) - Math.min(Math.max(0, y), mapHeight);\n    const fracIntersect = (w * h) / (mapWidth * mapHeight);\n    if (fracIntersect < FRAC_VIEWPOINT_AREA) {\n      this.minimap.classList.remove('hidden');\n    } else {\n      this.minimap.classList.add('hidden');\n    }\n  }\n}\n"]}