[DevTools] Make UI.GlassPane position contentElement for different overlay controls.

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

+// Copyright 2017 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.
+
+UI.GlassPane = class {
+  /**
+   * @param {!Document} document
+   * @param {boolean} dimmed
+   * @param {boolean} blockPointerEvents
+   */
+  constructor(document, dimmed, blockPointerEvents) {
+    this.element = createElementWithClass('div', 'glass-pane');
+    this.element.style.backgroundColor = dimmed ? 'rgba(255, 255, 255, 0.5)' : 'transparent';
+    if (!blockPointerEvents)
+      this.element.style.pointerEvents = 'none';
+
+    this._document = document;
+    /** @type {?Element} */
+    this._contentElement = null;
+    this._visible = false;
+    /** @type {?UI.Size} */
+    this._maxSize = null;
+    /** @type {?number} */
+    this._positionX = null;
+    /** @type {?number} */
+    this._positionY = null;
+    /** @type {?AnchorBox} */
+    this._anchorBox = null;
+    this._anchorBehavior = UI.GlassPane.AnchorBehavior.PreferTop;
+  }
+
+  /**
+   * @param {?Element} contentElement
+   */
+  setContentElement(contentElement) {
+    if (this._contentElement) {
+      this._contentElement.classList.remove('glass-pane-content');
+      if (this._visible)
+        this.element.removeChild(this._contentElement);
+    }
+    this._contentElement = contentElement;
+    if (this._contentElement) {
+      this._contentElement.classList.add('glass-pane-content');
+      if (this._visible)
+        this.element.appendChild(this._contentElement);
+    }
+  }
+
+  /**
+   * @param {?UI.Size} size
+   */
+  setMaxContentSize(size) {
+    this._maxSize = size;
+  }
+
+  /**
+   * @param {?number} x
+   * @param {?number} y
+   * Position is relative to root element.
+   */
+  setContentPosition(x, y) {
+    this._positionX = x;
+    this._positionY = y;
+  }
+
+  /**
+   * @param {?AnchorBox} anchorBox
+   * Anchor box is relative to the document.
+   */
+  setAnchorBox(anchorBox) {
+    this._anchorBox = anchorBox;
+  }
+
+  /**
+   * @param {!UI.GlassPane.AnchorBehavior} behavior
+   */
+  setAnchorBehavior(behavior) {
+    this._anchorBehavior = behavior;
+  }
+
+  show() {
+    if (this._visible)
+      return;
+    this._visible = true;
+    // Deliberately starts with 3000 to hide other z-indexed elements below.
+    this.element.style.zIndex = 3000 + 1000 * UI.GlassPane._panes.size;
+    this._document.body.appendChild(this.element);
+    if (this._contentElement)
+      this.element.appendChild(this._contentElement);
+    UI.GlassPane._panes.add(this);
+  }
+
+  hide() {
+    if (!this._visible)
+      return;
+    UI.GlassPane._panes.delete(this);
+    if (this._contentElement)
+      this.element.removeChild(this._contentElement);
+    this._document.body.removeChild(this.element);
+    this._visible = false;
+  }
+
+  /**
+   * @return {boolean}
+   */
+  visible() {
+    return this._visible;
+  }
+
+  positionContent() {
+    if (!this._visible || !this._contentElement)
+      return;
+
+    var gutterSize = 5;
+    var container = UI.GlassPane._containers.get(this._document);
+    var containerWidth = container.offsetWidth;
+    var containerHeight = container.offsetHeight;
+
+    var width = containerWidth - gutterSize * 2;
+    var height = containerHeight - gutterSize * 2;
+    var positionX = gutterSize;
+    var positionY = gutterSize;
+
+    if (this._maxSize) {
+      width = Math.min(width, this._maxSize.width);
+      height = Math.min(height, this._maxSize.height);
+    }
+
+    if (this._anchorBox) {
+      var anchorBox = this._anchorBox.relativeToElement(container);
+      var behavior = this._anchorBehavior;
+
+      if (behavior === UI.GlassPane.AnchorBehavior.PreferTop || behavior === UI.GlassPane.AnchorBehavior.PreferBottom) {
+        var top = anchorBox.y - gutterSize;
+        var bottom = containerHeight - anchorBox.y - anchorBox.height - gutterSize;
+        if (behavior === UI.GlassPane.AnchorBehavior.PreferTop && top < height && bottom >= height)
+          behavior = UI.GlassPane.AnchorBehavior.PreferBottom;
+        if (behavior === UI.GlassPane.AnchorBehavior.PreferBottom && bottom < height && top >= height)
+          behavior = UI.GlassPane.AnchorBehavior.PreferTop;
+
+        positionX = Math.max(gutterSize, Math.min(anchorBox.x, containerWidth - width - gutterSize));
+        width = Math.min(width, containerWidth - positionX - gutterSize);
+        if (behavior === UI.GlassPane.AnchorBehavior.PreferTop) {
+          positionY = Math.max(gutterSize, anchorBox.y - height);
+          height = Math.min(height, anchorBox.y - positionY);
+        } else {
+          positionY = anchorBox.y + anchorBox.height;
+          height = Math.min(height, containerHeight - positionY - gutterSize);
+        }
+      } else {
+        var left = anchorBox.x - gutterSize;
+        var right = containerWidth - anchorBox.x - anchorBox.width - gutterSize;
+        if (behavior === UI.GlassPane.AnchorBehavior.PreferLeft && left < width && right >= width)
+          behavior = UI.GlassPane.AnchorBehavior.PreferRight;
+        if (behavior === UI.GlassPane.AnchorBehavior.PreferRight && right < width && left >= width)
+          behavior = UI.GlassPane.AnchorBehavior.PreferLeft;
+
+        positionY = Math.max(gutterSize, Math.min(anchorBox.y, containerHeight - height - gutterSize));
+        height = Math.min(height, containerHeight - positionY - gutterSize);
+        if (behavior === UI.GlassPane.AnchorBehavior.PreferLeft) {
+          positionX = Math.max(gutterSize, anchorBox.x - width);
+          width = Math.min(width, anchorBox.x - positionX);
+        } else {
+          positionX = anchorBox.x + anchorBox.width;
+          width = Math.min(width, containerWidth - positionX - gutterSize);
+        }
+      }
+    } else {
+      positionX = this._positionX !== null ? this._positionX : (containerWidth - width) / 2;
+      positionY = this._positionY !== null ? this._positionY : (containerHeight - height) / 2;
+      width = Math.min(width, containerWidth - positionX - gutterSize);
+      height = Math.min(height, containerHeight - positionY - gutterSize);
+    }
+
+    this._contentElement.style.width = width + 'px';
+    this._contentElement.style.height = height + 'px';
+    this._contentElement.positionAt(positionX, positionY, container);
+  }
+
+  /**
+   * @param {!Element} element
+   */
+  static setContainer(element) {
+    UI.GlassPane._containers.set(/** @type {!Document} */ (element.ownerDocument), element);
+    UI.GlassPane.containerMoved(element);
+  }
+
+  /**
+   * @param {!Document} document
+   * @return {!Element}
+   */
+  static container(document) {
+    return UI.GlassPane._containers.get(document);
+  }
+
+  /**
+   * @param {!Element} element
+   */
+  static containerMoved(element) {
+    for (var pane of UI.GlassPane._panes) {
+      if (pane._document === element.ownerDocument)
+        pane.positionContent();
+    }
+  }
+};
+
+/**
+ * @enum {symbol}
+ */
+UI.GlassPane.AnchorBehavior = {
+  PreferTop: Symbol('PreferTop'),
+  PreferBottom: Symbol('PreferBottom'),
+  PreferLeft: Symbol('PreferLeft'),
+  PreferRight: Symbol('PreferRight'),
+};
+
+/** @type {!Map<!Document, !Element>} */
+UI.GlassPane._containers = new Map();
+/** @type {!Set<!UI.GlassPane>} */
+UI.GlassPane._panes = new Set();