DevTools: extract modules (non-extensions)

third_party/WebKit/Source/devtools/front_end/ui/CSSShadowEditor.js

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-/**
- * @unrestricted
- */
-UI.CSSShadowEditor = class extends UI.VBox {
-  constructor() {
-    super(true);
-    this.registerRequiredCSS('ui/cssShadowEditor.css');
-    this.contentElement.tabIndex = 0;
-    this.setDefaultFocusedElement(this.contentElement);
-
-    this._typeField = this.contentElement.createChild('div', 'shadow-editor-field');
-    this._typeField.createChild('label', 'shadow-editor-label').textContent = Common.UIString('Type');
-    this._outsetButton = this._typeField.createChild('button', 'shadow-editor-button-left');
-    this._outsetButton.textContent = Common.UIString('Outset');
-    this._outsetButton.addEventListener('click', this._onButtonClick.bind(this), false);
-    this._insetButton = this._typeField.createChild('button', 'shadow-editor-button-right');
-    this._insetButton.textContent = Common.UIString('Inset');
-    this._insetButton.addEventListener('click', this._onButtonClick.bind(this), false);
-
-    var xField = this.contentElement.createChild('div', 'shadow-editor-field');
-    this._xInput = this._createTextInput(xField, Common.UIString('X offset'));
-    var yField = this.contentElement.createChild('div', 'shadow-editor-field');
-    this._yInput = this._createTextInput(yField, Common.UIString('Y offset'));
-    this._xySlider = xField.createChild('canvas', 'shadow-editor-2D-slider');
-    this._xySlider.width = UI.CSSShadowEditor.canvasSize;
-    this._xySlider.height = UI.CSSShadowEditor.canvasSize;
-    this._xySlider.tabIndex = -1;
-    this._halfCanvasSize = UI.CSSShadowEditor.canvasSize / 2;
-    this._innerCanvasSize = this._halfCanvasSize - UI.CSSShadowEditor.sliderThumbRadius;
-    UI.installDragHandle(this._xySlider, this._dragStart.bind(this), this._dragMove.bind(this), null, 'default');
-    this._xySlider.addEventListener('keydown', this._onCanvasArrowKey.bind(this), false);
-    this._xySlider.addEventListener('blur', this._onCanvasBlur.bind(this), false);
-
-    var blurField = this.contentElement.createChild('div', 'shadow-editor-blur-field');
-    this._blurInput = this._createTextInput(blurField, Common.UIString('Blur'));
-    this._blurSlider = this._createSlider(blurField);
-
-    this._spreadField = this.contentElement.createChild('div', 'shadow-editor-field');
-    this._spreadInput = this._createTextInput(this._spreadField, Common.UIString('Spread'));
-    this._spreadSlider = this._createSlider(this._spreadField);
-  }
-
-  /**
-   * @param {!Element} field
-   * @param {string} propertyName
-   * @return {!Element}
-   */
-  _createTextInput(field, propertyName) {
-    var label = field.createChild('label', 'shadow-editor-label');
-    label.textContent = propertyName;
-    label.setAttribute('for', propertyName);
-    var textInput = field.createChild('input', 'shadow-editor-text-input');
-    textInput.type = 'text';
-    textInput.id = propertyName;
-    textInput.addEventListener('keydown', this._handleValueModification.bind(this), false);
-    textInput.addEventListener('mousewheel', this._handleValueModification.bind(this), false);
-    textInput.addEventListener('input', this._onTextInput.bind(this), false);
-    textInput.addEventListener('blur', this._onTextBlur.bind(this), false);
-    return textInput;
-  }
-
-  /**
-   * @param {!Element} field
-   * @return {!Element}
-   */
-  _createSlider(field) {
-    var slider = UI.createSliderLabel(0, UI.CSSShadowEditor.maxRange, -1);
-    slider.addEventListener('input', this._onSliderInput.bind(this), false);
-    field.appendChild(slider);
-    return slider;
-  }
-
-  /**
-   * @override
-   */
-  wasShown() {
-    this._updateUI();
-  }
-
-  /**
-   * @param {!Common.CSSShadowModel} model
-   */
-  setModel(model) {
-    this._model = model;
-    this._typeField.hidden = !model.isBoxShadow();
-    this._spreadField.hidden = !model.isBoxShadow();
-    this._updateUI();
-  }
-
-  _updateUI() {
-    this._updateButtons();
-    this._xInput.value = this._model.offsetX().asCSSText();
-    this._yInput.value = this._model.offsetY().asCSSText();
-    this._blurInput.value = this._model.blurRadius().asCSSText();
-    this._spreadInput.value = this._model.spreadRadius().asCSSText();
-    this._blurSlider.value = this._model.blurRadius().amount;
-    this._spreadSlider.value = this._model.spreadRadius().amount;
-    this._updateCanvas(false);
-  }
-
-  _updateButtons() {
-    this._insetButton.classList.toggle('enabled', this._model.inset());
-    this._outsetButton.classList.toggle('enabled', !this._model.inset());
-  }
-
-  /**
-   * @param {boolean} drawFocus
-   */
-  _updateCanvas(drawFocus) {
-    var context = this._xySlider.getContext('2d');
-    context.clearRect(0, 0, this._xySlider.width, this._xySlider.height);
-
-    // Draw dashed axes.
-    context.save();
-    context.setLineDash([1, 1]);
-    context.strokeStyle = 'rgba(210, 210, 210, 0.8)';
-    context.beginPath();
-    context.moveTo(this._halfCanvasSize, 0);
-    context.lineTo(this._halfCanvasSize, UI.CSSShadowEditor.canvasSize);
-    context.moveTo(0, this._halfCanvasSize);
-    context.lineTo(UI.CSSShadowEditor.canvasSize, this._halfCanvasSize);
-    context.stroke();
-    context.restore();
-
-    var thumbPoint = this._sliderThumbPosition();
-    // Draw 2D slider line.
-    context.save();
-    context.translate(this._halfCanvasSize, this._halfCanvasSize);
-    context.lineWidth = 2;
-    context.strokeStyle = 'rgba(130, 130, 130, 0.75)';
-    context.beginPath();
-    context.moveTo(0, 0);
-    context.lineTo(thumbPoint.x, thumbPoint.y);
-    context.stroke();
-    // Draw 2D slider thumb.
-    if (drawFocus) {
-      context.beginPath();
-      context.fillStyle = 'rgba(66, 133, 244, 0.4)';
-      context.arc(thumbPoint.x, thumbPoint.y, UI.CSSShadowEditor.sliderThumbRadius + 2, 0, 2 * Math.PI);
-      context.fill();
-    }
-    context.beginPath();
-    context.fillStyle = '#4285F4';
-    context.arc(thumbPoint.x, thumbPoint.y, UI.CSSShadowEditor.sliderThumbRadius, 0, 2 * Math.PI);
-    context.fill();
-    context.restore();
-  }
-
-  /**
-   * @param {!Event} event
-   */
-  _onButtonClick(event) {
-    var insetClicked = (event.currentTarget === this._insetButton);
-    if (insetClicked && this._model.inset() || !insetClicked && !this._model.inset())
-      return;
-    this._model.setInset(insetClicked);
-    this._updateButtons();
-    this.dispatchEventToListeners(UI.CSSShadowEditor.Events.ShadowChanged, this._model);
-  }
-
-  /**
-   * @param {!Event} event
-   */
-  _handleValueModification(event) {
-    var modifiedValue = UI.createReplacementString(event.currentTarget.value, event, customNumberHandler);
-    if (!modifiedValue)
-      return;
-    var length = Common.CSSLength.parse(modifiedValue);
-    if (!length)
-      return;
-    if (event.currentTarget === this._blurInput && length.amount < 0)
-      length.amount = 0;
-    event.currentTarget.value = length.asCSSText();
-    event.currentTarget.selectionStart = 0;
-    event.currentTarget.selectionEnd = event.currentTarget.value.length;
-    this._onTextInput(event);
-    event.consume(true);
-
-    /**
-     * @param {string} prefix
-     * @param {number} number
-     * @param {string} suffix
-     * @return {string}
-     */
-    function customNumberHandler(prefix, number, suffix) {
-      if (!suffix.length)
-        suffix = UI.CSSShadowEditor.defaultUnit;
-      return prefix + number + suffix;
-    }
-  }
-
-  /**
-   * @param {!Event} event
-   */
-  _onTextInput(event) {
-    this._changedElement = event.currentTarget;
-    this._changedElement.classList.remove('invalid');
-    var length = Common.CSSLength.parse(event.currentTarget.value);
-    if (!length || event.currentTarget === this._blurInput && length.amount < 0)
-      return;
-    if (event.currentTarget === this._xInput) {
-      this._model.setOffsetX(length);
-      this._updateCanvas(false);
-    } else if (event.currentTarget === this._yInput) {
-      this._model.setOffsetY(length);
-      this._updateCanvas(false);
-    } else if (event.currentTarget === this._blurInput) {
-      this._model.setBlurRadius(length);
-      this._blurSlider.value = length.amount;
-    } else if (event.currentTarget === this._spreadInput) {
-      this._model.setSpreadRadius(length);
-      this._spreadSlider.value = length.amount;
-    }
-    this.dispatchEventToListeners(UI.CSSShadowEditor.Events.ShadowChanged, this._model);
-  }
-
-  _onTextBlur() {
-    if (!this._changedElement)
-      return;
-    var length = !this._changedElement.value.trim() ? Common.CSSLength.zero() :
-                                                      Common.CSSLength.parse(this._changedElement.value);
-    if (!length)
-      length = Common.CSSLength.parse(this._changedElement.value + UI.CSSShadowEditor.defaultUnit);
-    if (!length) {
-      this._changedElement.classList.add('invalid');
-      this._changedElement = null;
-      return;
-    }
-    if (this._changedElement === this._xInput) {
-      this._model.setOffsetX(length);
-      this._xInput.value = length.asCSSText();
-      this._updateCanvas(false);
-    } else if (this._changedElement === this._yInput) {
-      this._model.setOffsetY(length);
-      this._yInput.value = length.asCSSText();
-      this._updateCanvas(false);
-    } else if (this._changedElement === this._blurInput) {
-      if (length.amount < 0)
-        length = Common.CSSLength.zero();
-      this._model.setBlurRadius(length);
-      this._blurInput.value = length.asCSSText();
-      this._blurSlider.value = length.amount;
-    } else if (this._changedElement === this._spreadInput) {
-      this._model.setSpreadRadius(length);
-      this._spreadInput.value = length.asCSSText();
-      this._spreadSlider.value = length.amount;
-    }
-    this._changedElement = null;
-    this.dispatchEventToListeners(UI.CSSShadowEditor.Events.ShadowChanged, this._model);
-  }
-
-  /**
-   * @param {!Event} event
-   */
-  _onSliderInput(event) {
-    if (event.currentTarget === this._blurSlider) {
-      this._model.setBlurRadius(new Common.CSSLength(
-          this._blurSlider.value, this._model.blurRadius().unit || UI.CSSShadowEditor.defaultUnit));
-      this._blurInput.value = this._model.blurRadius().asCSSText();
-      this._blurInput.classList.remove('invalid');
-    } else if (event.currentTarget === this._spreadSlider) {
-      this._model.setSpreadRadius(new Common.CSSLength(
-          this._spreadSlider.value, this._model.spreadRadius().unit || UI.CSSShadowEditor.defaultUnit));
-      this._spreadInput.value = this._model.spreadRadius().asCSSText();
-      this._spreadInput.classList.remove('invalid');
-    }
-    this.dispatchEventToListeners(UI.CSSShadowEditor.Events.ShadowChanged, this._model);
-  }
-
-  /**
-   * @param {!MouseEvent} event
-   * @return {boolean}
-   */
-  _dragStart(event) {
-    this._xySlider.focus();
-    this._updateCanvas(true);
-    this._canvasOrigin = new Common.Geometry.Point(
-        this._xySlider.totalOffsetLeft() + this._halfCanvasSize,
-        this._xySlider.totalOffsetTop() + this._halfCanvasSize);
-    var clickedPoint = new Common.Geometry.Point(event.x - this._canvasOrigin.x, event.y - this._canvasOrigin.y);
-    var thumbPoint = this._sliderThumbPosition();
-    if (clickedPoint.distanceTo(thumbPoint) >= UI.CSSShadowEditor.sliderThumbRadius)
-      this._dragMove(event);
-    return true;
-  }
-
-  /**
-   * @param {!MouseEvent} event
-   */
-  _dragMove(event) {
-    var point = new Common.Geometry.Point(event.x - this._canvasOrigin.x, event.y - this._canvasOrigin.y);
-    if (event.shiftKey)
-      point = this._snapToClosestDirection(point);
-    var constrainedPoint = this._constrainPoint(point, this._innerCanvasSize);
-    var newX = Math.round((constrainedPoint.x / this._innerCanvasSize) * UI.CSSShadowEditor.maxRange);
-    var newY = Math.round((constrainedPoint.y / this._innerCanvasSize) * UI.CSSShadowEditor.maxRange);
-
-    if (event.shiftKey) {
-      this._model.setOffsetX(new Common.CSSLength(newX, this._model.offsetX().unit || UI.CSSShadowEditor.defaultUnit));
-      this._model.setOffsetY(new Common.CSSLength(newY, this._model.offsetY().unit || UI.CSSShadowEditor.defaultUnit));
-    } else {
-      if (!event.altKey) {
-        this._model.setOffsetX(
-            new Common.CSSLength(newX, this._model.offsetX().unit || UI.CSSShadowEditor.defaultUnit));
-      }
-      if (!UI.KeyboardShortcut.eventHasCtrlOrMeta(event)) {
-        this._model.setOffsetY(
-            new Common.CSSLength(newY, this._model.offsetY().unit || UI.CSSShadowEditor.defaultUnit));
-      }
-    }
-    this._xInput.value = this._model.offsetX().asCSSText();
-    this._yInput.value = this._model.offsetY().asCSSText();
-    this._xInput.classList.remove('invalid');
-    this._yInput.classList.remove('invalid');
-    this._updateCanvas(true);
-    this.dispatchEventToListeners(UI.CSSShadowEditor.Events.ShadowChanged, this._model);
-  }
-
-  _onCanvasBlur() {
-    this._updateCanvas(false);
-  }
-
-  /**
-   * @param {!Event} event
-   */
-  _onCanvasArrowKey(event) {
-    var shiftX = 0;
-    var shiftY = 0;
-    if (event.key === 'ArrowRight')
-      shiftX = 1;
-    else if (event.key === 'ArrowLeft')
-      shiftX = -1;
-    else if (event.key === 'ArrowUp')
-      shiftY = -1;
-    else if (event.key === 'ArrowDown')
-      shiftY = 1;
-
-    if (!shiftX && !shiftY)
-      return;
-    event.consume(true);
-
-    if (shiftX) {
-      var offsetX = this._model.offsetX();
-      var newAmount =
-          Number.constrain(offsetX.amount + shiftX, -UI.CSSShadowEditor.maxRange, UI.CSSShadowEditor.maxRange);
-      if (newAmount === offsetX.amount)
-        return;
-      this._model.setOffsetX(new Common.CSSLength(newAmount, offsetX.unit || UI.CSSShadowEditor.defaultUnit));
-      this._xInput.value = this._model.offsetX().asCSSText();
-      this._xInput.classList.remove('invalid');
-    }
-    if (shiftY) {
-      var offsetY = this._model.offsetY();
-      var newAmount =
-          Number.constrain(offsetY.amount + shiftY, -UI.CSSShadowEditor.maxRange, UI.CSSShadowEditor.maxRange);
-      if (newAmount === offsetY.amount)
-        return;
-      this._model.setOffsetY(new Common.CSSLength(newAmount, offsetY.unit || UI.CSSShadowEditor.defaultUnit));
-      this._yInput.value = this._model.offsetY().asCSSText();
-      this._yInput.classList.remove('invalid');
-    }
-    this._updateCanvas(true);
-    this.dispatchEventToListeners(UI.CSSShadowEditor.Events.ShadowChanged, this._model);
-  }
-
-  /**
-   * @param {!Common.Geometry.Point} point
-   * @param {number} max
-   * @return {!Common.Geometry.Point}
-   */
-  _constrainPoint(point, max) {
-    if (Math.abs(point.x) <= max && Math.abs(point.y) <= max)
-      return new Common.Geometry.Point(point.x, point.y);
-    return point.scale(max / Math.max(Math.abs(point.x), Math.abs(point.y)));
-  }
-
-  /**
-   * @param {!Common.Geometry.Point} point
-   * @return {!Common.Geometry.Point}
-   */
-  _snapToClosestDirection(point) {
-    var minDistance = Number.MAX_VALUE;
-    var closestPoint = point;
-
-    var directions = [
-      new Common.Geometry.Point(0, -1),  // North
-      new Common.Geometry.Point(1, -1),  // Northeast
-      new Common.Geometry.Point(1, 0),   // East
-      new Common.Geometry.Point(1, 1)    // Southeast
-    ];
-
-    for (var direction of directions) {
-      var projection = point.projectOn(direction);
-      var distance = point.distanceTo(projection);
-      if (distance < minDistance) {
-        minDistance = distance;
-        closestPoint = projection;
-      }
-    }
-
-    return closestPoint;
-  }
-
-  /**
-   * @return {!Common.Geometry.Point}
-   */
-  _sliderThumbPosition() {
-    var x = (this._model.offsetX().amount / UI.CSSShadowEditor.maxRange) * this._innerCanvasSize;
-    var y = (this._model.offsetY().amount / UI.CSSShadowEditor.maxRange) * this._innerCanvasSize;
-    return this._constrainPoint(new Common.Geometry.Point(x, y), this._innerCanvasSize);
-  }
-};
-
-/** @enum {symbol} */
-UI.CSSShadowEditor.Events = {
-  ShadowChanged: Symbol('ShadowChanged')
-};
-
-/** @type {number} */
-UI.CSSShadowEditor.maxRange = 20;
-/** @type {string} */
-UI.CSSShadowEditor.defaultUnit = 'px';
-/** @type {number} */
-UI.CSSShadowEditor.sliderThumbRadius = 6;
-/** @type {number} */
-UI.CSSShadowEditor.canvasSize = 88;