layout.js

var zrUtil = require("zrender/lib/core/util");

var BoundingRect = require("zrender/lib/core/BoundingRect");

var _number = require("./number");

var parsePercent = _number.parsePercent;

var formatUtil = require("./format");

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/
// Layout helpers for each component positioning
var each = zrUtil.each;
/**
 * @public
 */

var LOCATION_PARAMS = ['left', 'right', 'top', 'bottom', 'width', 'height'];
/**
 * @public
 */

var HV_NAMES = [['width', 'left', 'right'], ['height', 'top', 'bottom']];

function boxLayout(orient, group, gap, maxWidth, maxHeight) {
  var x = 0;
  var y = 0;

  if (maxWidth == null) {
    maxWidth = Infinity;
  }

  if (maxHeight == null) {
    maxHeight = Infinity;
  }

  var currentLineMaxSize = 0;
  group.eachChild(function (child, idx) {
    var position = child.position;
    var rect = child.getBoundingRect();
    var nextChild = group.childAt(idx + 1);
    var nextChildRect = nextChild && nextChild.getBoundingRect();
    var nextX;
    var nextY;

    if (orient === 'horizontal') {
      var moveX = rect.width + (nextChildRect ? -nextChildRect.x + rect.x : 0);
      nextX = x + moveX; // Wrap when width exceeds maxWidth or meet a `newline` group
      // FIXME compare before adding gap?

      if (nextX > maxWidth || child.newline) {
        x = 0;
        nextX = moveX;
        y += currentLineMaxSize + gap;
        currentLineMaxSize = rect.height;
      } else {
        // FIXME: consider rect.y is not `0`?
        currentLineMaxSize = Math.max(currentLineMaxSize, rect.height);
      }
    } else {
      var moveY = rect.height + (nextChildRect ? -nextChildRect.y + rect.y : 0);
      nextY = y + moveY; // Wrap when width exceeds maxHeight or meet a `newline` group

      if (nextY > maxHeight || child.newline) {
        x += currentLineMaxSize + gap;
        y = 0;
        nextY = moveY;
        currentLineMaxSize = rect.width;
      } else {
        currentLineMaxSize = Math.max(currentLineMaxSize, rect.width);
      }
    }

    if (child.newline) {
      return;
    }

    position[0] = x;
    position[1] = y;
    orient === 'horizontal' ? x = nextX + gap : y = nextY + gap;
  });
}
/**
 * VBox or HBox layouting
 * @param {string} orient
 * @param {module:zrender/container/Group} group
 * @param {number} gap
 * @param {number} [width=Infinity]
 * @param {number} [height=Infinity]
 */


var box = boxLayout;
/**
 * VBox layouting
 * @param {module:zrender/container/Group} group
 * @param {number} gap
 * @param {number} [width=Infinity]
 * @param {number} [height=Infinity]
 */

var vbox = zrUtil.curry(boxLayout, 'vertical');
/**
 * HBox layouting
 * @param {module:zrender/container/Group} group
 * @param {number} gap
 * @param {number} [width=Infinity]
 * @param {number} [height=Infinity]
 */

var hbox = zrUtil.curry(boxLayout, 'horizontal');
/**
 * If x or x2 is not specified or 'center' 'left' 'right',
 * the width would be as long as possible.
 * If y or y2 is not specified or 'middle' 'top' 'bottom',
 * the height would be as long as possible.
 *
 * @param {Object} positionInfo
 * @param {number|string} [positionInfo.x]
 * @param {number|string} [positionInfo.y]
 * @param {number|string} [positionInfo.x2]
 * @param {number|string} [positionInfo.y2]
 * @param {Object} containerRect {width, height}
 * @param {string|number} margin
 * @return {Object} {width, height}
 */

function getAvailableSize(positionInfo, containerRect, margin) {
  var containerWidth = containerRect.width;
  var containerHeight = containerRect.height;
  var x = parsePercent(positionInfo.x, containerWidth);
  var y = parsePercent(positionInfo.y, containerHeight);
  var x2 = parsePercent(positionInfo.x2, containerWidth);
  var y2 = parsePercent(positionInfo.y2, containerHeight);
  (isNaN(x) || isNaN(parseFloat(positionInfo.x))) && (x = 0);
  (isNaN(x2) || isNaN(parseFloat(positionInfo.x2))) && (x2 = containerWidth);
  (isNaN(y) || isNaN(parseFloat(positionInfo.y))) && (y = 0);
  (isNaN(y2) || isNaN(parseFloat(positionInfo.y2))) && (y2 = containerHeight);
  margin = formatUtil.normalizeCssArray(margin || 0);
  return {
    width: Math.max(x2 - x - margin[1] - margin[3], 0),
    height: Math.max(y2 - y - margin[0] - margin[2], 0)
  };
}
/**
 * Parse position info.
 *
 * @param {Object} positionInfo
 * @param {number|string} [positionInfo.left]
 * @param {number|string} [positionInfo.top]
 * @param {number|string} [positionInfo.right]
 * @param {number|string} [positionInfo.bottom]
 * @param {number|string} [positionInfo.width]
 * @param {number|string} [positionInfo.height]
 * @param {number|string} [positionInfo.aspect] Aspect is width / height
 * @param {Object} containerRect
 * @param {string|number} [margin]
 *
 * @return {module:zrender/core/BoundingRect}
 */


function getLayoutRect(positionInfo, containerRect, margin) {
  margin = formatUtil.normalizeCssArray(margin || 0);
  var containerWidth = containerRect.width;
  var containerHeight = containerRect.height;
  var left = parsePercent(positionInfo.left, containerWidth);
  var top = parsePercent(positionInfo.top, containerHeight);
  var right = parsePercent(positionInfo.right, containerWidth);
  var bottom = parsePercent(positionInfo.bottom, containerHeight);
  var width = parsePercent(positionInfo.width, containerWidth);
  var height = parsePercent(positionInfo.height, containerHeight);
  var verticalMargin = margin[2] + margin[0];
  var horizontalMargin = margin[1] + margin[3];
  var aspect = positionInfo.aspect; // If width is not specified, calculate width from left and right

  if (isNaN(width)) {
    width = containerWidth - right - horizontalMargin - left;
  }

  if (isNaN(height)) {
    height = containerHeight - bottom - verticalMargin - top;
  }

  if (aspect != null) {
    // If width and height are not given
    // 1. Graph should not exceeds the container
    // 2. Aspect must be keeped
    // 3. Graph should take the space as more as possible
    // FIXME
    // Margin is not considered, because there is no case that both
    // using margin and aspect so far.
    if (isNaN(width) && isNaN(height)) {
      if (aspect > containerWidth / containerHeight) {
        width = containerWidth * 0.8;
      } else {
        height = containerHeight * 0.8;
      }
    } // Calculate width or height with given aspect


    if (isNaN(width)) {
      width = aspect * height;
    }

    if (isNaN(height)) {
      height = width / aspect;
    }
  } // If left is not specified, calculate left from right and width


  if (isNaN(left)) {
    left = containerWidth - right - width - horizontalMargin;
  }

  if (isNaN(top)) {
    top = containerHeight - bottom - height - verticalMargin;
  } // Align left and top


  switch (positionInfo.left || positionInfo.right) {
    case 'center':
      left = containerWidth / 2 - width / 2 - margin[3];
      break;

    case 'right':
      left = containerWidth - width - horizontalMargin;
      break;
  }

  switch (positionInfo.top || positionInfo.bottom) {
    case 'middle':
    case 'center':
      top = containerHeight / 2 - height / 2 - margin[0];
      break;

    case 'bottom':
      top = containerHeight - height - verticalMargin;
      break;
  } // If something is wrong and left, top, width, height are calculated as NaN


  left = left || 0;
  top = top || 0;

  if (isNaN(width)) {
    // Width may be NaN if only one value is given except width
    width = containerWidth - horizontalMargin - left - (right || 0);
  }

  if (isNaN(height)) {
    // Height may be NaN if only one value is given except height
    height = containerHeight - verticalMargin - top - (bottom || 0);
  }

  var rect = new BoundingRect(left + margin[3], top + margin[0], width, height);
  rect.margin = margin;
  return rect;
}
/**
 * Position a zr element in viewport
 *  Group position is specified by either
 *  {left, top}, {right, bottom}
 *  If all properties exists, right and bottom will be igonred.
 *
 * Logic:
 *     1. Scale (against origin point in parent coord)
 *     2. Rotate (against origin point in parent coord)
 *     3. Traslate (with el.position by this method)
 * So this method only fixes the last step 'Traslate', which does not affect
 * scaling and rotating.
 *
 * If be called repeatly with the same input el, the same result will be gotten.
 *
 * @param {module:zrender/Element} el Should have `getBoundingRect` method.
 * @param {Object} positionInfo
 * @param {number|string} [positionInfo.left]
 * @param {number|string} [positionInfo.top]
 * @param {number|string} [positionInfo.right]
 * @param {number|string} [positionInfo.bottom]
 * @param {number|string} [positionInfo.width] Only for opt.boundingModel: 'raw'
 * @param {number|string} [positionInfo.height] Only for opt.boundingModel: 'raw'
 * @param {Object} containerRect
 * @param {string|number} margin
 * @param {Object} [opt]
 * @param {Array.<number>} [opt.hv=[1,1]] Only horizontal or only vertical.
 * @param {Array.<number>} [opt.boundingMode='all']
 *        Specify how to calculate boundingRect when locating.
 *        'all': Position the boundingRect that is transformed and uioned
 *               both itself and its descendants.
 *               This mode simplies confine the elements in the bounding
 *               of their container (e.g., using 'right: 0').
 *        'raw': Position the boundingRect that is not transformed and only itself.
 *               This mode is useful when you want a element can overflow its
 *               container. (Consider a rotated circle needs to be located in a corner.)
 *               In this mode positionInfo.width/height can only be number.
 */


function positionElement(el, positionInfo, containerRect, margin, opt) {
  var h = !opt || !opt.hv || opt.hv[0];
  var v = !opt || !opt.hv || opt.hv[1];
  var boundingMode = opt && opt.boundingMode || 'all';

  if (!h && !v) {
    return;
  }

  var rect;

  if (boundingMode === 'raw') {
    rect = el.type === 'group' ? new BoundingRect(0, 0, +positionInfo.width || 0, +positionInfo.height || 0) : el.getBoundingRect();
  } else {
    rect = el.getBoundingRect();

    if (el.needLocalTransform()) {
      var transform = el.getLocalTransform(); // Notice: raw rect may be inner object of el,
      // which should not be modified.

      rect = rect.clone();
      rect.applyTransform(transform);
    }
  } // The real width and height can not be specified but calculated by the given el.


  positionInfo = getLayoutRect(zrUtil.defaults({
    width: rect.width,
    height: rect.height
  }, positionInfo), containerRect, margin); // Because 'tranlate' is the last step in transform
  // (see zrender/core/Transformable#getLocalTransform),
  // we can just only modify el.position to get final result.

  var elPos = el.position;
  var dx = h ? positionInfo.x - rect.x : 0;
  var dy = v ? positionInfo.y - rect.y : 0;
  el.attr('position', boundingMode === 'raw' ? [dx, dy] : [elPos[0] + dx, elPos[1] + dy]);
}
/**
 * @param {Object} option Contains some of the properties in HV_NAMES.
 * @param {number} hvIdx 0: horizontal; 1: vertical.
 */


function sizeCalculable(option, hvIdx) {
  return option[HV_NAMES[hvIdx][0]] != null || option[HV_NAMES[hvIdx][1]] != null && option[HV_NAMES[hvIdx][2]] != null;
}
/**
 * Consider Case:
 * When defulat option has {left: 0, width: 100}, and we set {right: 0}
 * through setOption or media query, using normal zrUtil.merge will cause
 * {right: 0} does not take effect.
 *
 * @example
 * ComponentModel.extend({
 *     init: function () {
 *         ...
 *         var inputPositionParams = layout.getLayoutParams(option);
 *         this.mergeOption(inputPositionParams);
 *     },
 *     mergeOption: function (newOption) {
 *         newOption && zrUtil.merge(thisOption, newOption, true);
 *         layout.mergeLayoutParam(thisOption, newOption);
 *     }
 * });
 *
 * @param {Object} targetOption
 * @param {Object} newOption
 * @param {Object|string} [opt]
 * @param {boolean|Array.<boolean>} [opt.ignoreSize=false] Used for the components
 *  that width (or height) should not be calculated by left and right (or top and bottom).
 */


function mergeLayoutParam(targetOption, newOption, opt) {
  !zrUtil.isObject(opt) && (opt = {});
  var ignoreSize = opt.ignoreSize;
  !zrUtil.isArray(ignoreSize) && (ignoreSize = [ignoreSize, ignoreSize]);
  var hResult = merge(HV_NAMES[0], 0);
  var vResult = merge(HV_NAMES[1], 1);
  copy(HV_NAMES[0], targetOption, hResult);
  copy(HV_NAMES[1], targetOption, vResult);

  function merge(names, hvIdx) {
    var newParams = {};
    var newValueCount = 0;
    var merged = {};
    var mergedValueCount = 0;
    var enoughParamNumber = 2;
    each(names, function (name) {
      merged[name] = targetOption[name];
    });
    each(names, function (name) {
      // Consider case: newOption.width is null, which is
      // set by user for removing width setting.
      hasProp(newOption, name) && (newParams[name] = merged[name] = newOption[name]);
      hasValue(newParams, name) && newValueCount++;
      hasValue(merged, name) && mergedValueCount++;
    });

    if (ignoreSize[hvIdx]) {
      // Only one of left/right is premitted to exist.
      if (hasValue(newOption, names[1])) {
        merged[names[2]] = null;
      } else if (hasValue(newOption, names[2])) {
        merged[names[1]] = null;
      }

      return merged;
    } // Case: newOption: {width: ..., right: ...},
    // or targetOption: {right: ...} and newOption: {width: ...},
    // There is no conflict when merged only has params count
    // little than enoughParamNumber.


    if (mergedValueCount === enoughParamNumber || !newValueCount) {
      return merged;
    } // Case: newOption: {width: ..., right: ...},
    // Than we can make sure user only want those two, and ignore
    // all origin params in targetOption.
    else if (newValueCount >= enoughParamNumber) {
        return newParams;
      } else {
        // Chose another param from targetOption by priority.
        for (var i = 0; i < names.length; i++) {
          var name = names[i];

          if (!hasProp(newParams, name) && hasProp(targetOption, name)) {
            newParams[name] = targetOption[name];
            break;
          }
        }

        return newParams;
      }
  }

  function hasProp(obj, name) {
    return obj.hasOwnProperty(name);
  }

  function hasValue(obj, name) {
    return obj[name] != null && obj[name] !== 'auto';
  }

  function copy(names, target, source) {
    each(names, function (name) {
      target[name] = source[name];
    });
  }
}
/**
 * Retrieve 'left', 'right', 'top', 'bottom', 'width', 'height' from object.
 * @param {Object} source
 * @return {Object} Result contains those props.
 */


function getLayoutParams(source) {
  return copyLayoutParams({}, source);
}
/**
 * Retrieve 'left', 'right', 'top', 'bottom', 'width', 'height' from object.
 * @param {Object} source
 * @return {Object} Result contains those props.
 */


function copyLayoutParams(target, source) {
  source && target && each(LOCATION_PARAMS, function (name) {
    source.hasOwnProperty(name) && (target[name] = source[name]);
  });
  return target;
}

exports.LOCATION_PARAMS = LOCATION_PARAMS;
exports.HV_NAMES = HV_NAMES;
exports.box = box;
exports.vbox = vbox;
exports.hbox = hbox;
exports.getAvailableSize = getAvailableSize;
exports.getLayoutRect = getLayoutRect;
exports.positionElement = positionElement;
exports.sizeCalculable = sizeCalculable;
exports.mergeLayoutParam = mergeLayoutParam;
exports.getLayoutParams = getLayoutParams;
exports.copyLayoutParams = copyLayoutParams;