1 files changed, 239 insertions, 0 deletions
diff --git a/blockly/core/zoom_controls.js b/blockly/core/zoom_controls.js
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+/**
+ * @license
+ * Visual Blocks Editor
+ *
+ * Copyright 2015 Google Inc.
+ * https://developers.google.com/blockly/
+ *
+ * Licensed 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.
+ */
+
+/**
+ * @fileoverview Object representing a zoom icons.
+ * @author carloslfu@gmail.com (Carlos Galarza)
+ */
+'use strict';
+
+goog.provide('Blockly.ZoomControls');
+
+goog.require('goog.dom');
+
+
+/**
+ * Class for a zoom controls.
+ * @param {!Blockly.Workspace} workspace The workspace to sit in.
+ * @constructor
+ */
+Blockly.ZoomControls = function(workspace) {
+  this.workspace_ = workspace;
+};
+
+/**
+ * Width of the zoom controls.
+ * @type {number}
+ * @private
+ */
+Blockly.ZoomControls.prototype.WIDTH_ = 32;
+
+/**
+ * Height of the zoom controls.
+ * @type {number}
+ * @private
+ */
+Blockly.ZoomControls.prototype.HEIGHT_ = 110;
+
+/**
+ * Distance between zoom controls and bottom edge of workspace.
+ * @type {number}
+ * @private
+ */
+Blockly.ZoomControls.prototype.MARGIN_BOTTOM_ = 20;
+
+/**
+ * Distance between zoom controls and right edge of workspace.
+ * @type {number}
+ * @private
+ */
+Blockly.ZoomControls.prototype.MARGIN_SIDE_ = 20;
+
+/**
+ * The SVG group containing the zoom controls.
+ * @type {Element}
+ * @private
+ */
+Blockly.ZoomControls.prototype.svgGroup_ = null;
+
+/**
+ * Left coordinate of the zoom controls.
+ * @type {number}
+ * @private
+ */
+Blockly.ZoomControls.prototype.left_ = 0;
+
+/**
+ * Top coordinate of the zoom controls.
+ * @type {number}
+ * @private
+ */
+Blockly.ZoomControls.prototype.top_ = 0;
+
+/**
+ * Create the zoom controls.
+ * @return {!Element} The zoom controls SVG group.
+ */
+Blockly.ZoomControls.prototype.createDom = function() {
+  var workspace = this.workspace_;
+  /* Here's the markup that will be generated:
+  <g class="blocklyZoom">
+    <clippath id="blocklyZoomoutClipPath837493">
+      <rect width="32" height="32" y="77"></rect>
+    </clippath>
+    <image width="96" height="124" x="-64" y="-15" xlink:href="media/sprites.png"
+        clip-path="url(#blocklyZoomoutClipPath837493)"></image>
+    <clippath id="blocklyZoominClipPath837493">
+      <rect width="32" height="32" y="43"></rect>
+    </clippath>
+    <image width="96" height="124" x="-32" y="-49" xlink:href="media/sprites.png"
+        clip-path="url(#blocklyZoominClipPath837493)"></image>
+    <clippath id="blocklyZoomresetClipPath837493">
+      <rect width="32" height="32"></rect>
+    </clippath>
+    <image width="96" height="124" y="-92" xlink:href="media/sprites.png"
+        clip-path="url(#blocklyZoomresetClipPath837493)"></image>
+  </g>
+  */
+  this.svgGroup_ = Blockly.createSvgElement('g',
+      {'class': 'blocklyZoom'}, null);
+  var rnd = String(Math.random()).substring(2);
+
+  var clip = Blockly.createSvgElement('clipPath',
+      {'id': 'blocklyZoomoutClipPath' + rnd},
+      this.svgGroup_);
+  Blockly.createSvgElement('rect',
+      {'width': 32, 'height': 32, 'y': 77},
+      clip);
+  var zoomoutSvg = Blockly.createSvgElement('image',
+      {'width': Blockly.SPRITE.width,
+       'height': Blockly.SPRITE.height, 'x': -64,
+       'y': -15,
+       'clip-path': 'url(#blocklyZoomoutClipPath' + rnd + ')'},
+      this.svgGroup_);
+  zoomoutSvg.setAttributeNS('http://www.w3.org/1999/xlink', 'xlink:href',
+      workspace.options.pathToMedia + Blockly.SPRITE.url);
+
+  var clip = Blockly.createSvgElement('clipPath',
+      {'id': 'blocklyZoominClipPath' + rnd},
+      this.svgGroup_);
+  Blockly.createSvgElement('rect',
+      {'width': 32, 'height': 32, 'y': 43},
+      clip);
+  var zoominSvg = Blockly.createSvgElement('image',
+      {'width': Blockly.SPRITE.width,
+       'height': Blockly.SPRITE.height,
+       'x': -32,
+       'y': -49,
+       'clip-path': 'url(#blocklyZoominClipPath' + rnd + ')'},
+      this.svgGroup_);
+  zoominSvg.setAttributeNS('http://www.w3.org/1999/xlink', 'xlink:href',
+      workspace.options.pathToMedia + Blockly.SPRITE.url);
+
+  var clip = Blockly.createSvgElement('clipPath',
+      {'id': 'blocklyZoomresetClipPath' + rnd},
+      this.svgGroup_);
+  Blockly.createSvgElement('rect',
+      {'width': 32, 'height': 32},
+      clip);
+  var zoomresetSvg = Blockly.createSvgElement('image',
+      {'width': Blockly.SPRITE.width,
+       'height': Blockly.SPRITE.height, 'y': -92,
+       'clip-path': 'url(#blocklyZoomresetClipPath' + rnd + ')'},
+      this.svgGroup_);
+  zoomresetSvg.setAttributeNS('http://www.w3.org/1999/xlink', 'xlink:href',
+      workspace.options.pathToMedia + Blockly.SPRITE.url);
+
+  // Attach event listeners.
+  Blockly.bindEvent_(zoomresetSvg, 'mousedown', null, function(e) {
+    workspace.setScale(1);
+    workspace.scrollCenter();
+    e.stopPropagation();  // Don't start a workspace scroll.
+    e.preventDefault();  // Stop double-clicking from selecting text.
+  });
+  Blockly.bindEvent_(zoominSvg, 'mousedown', null, function(e) {
+    workspace.zoomCenter(1);
+    e.stopPropagation();  // Don't start a workspace scroll.
+    e.preventDefault();  // Stop double-clicking from selecting text.
+  });
+  Blockly.bindEvent_(zoomoutSvg, 'mousedown', null, function(e) {
+    workspace.zoomCenter(-1);
+    e.stopPropagation();  // Don't start a workspace scroll.
+    e.preventDefault();  // Stop double-clicking from selecting text.
+  });
+
+  return this.svgGroup_;
+};
+
+/**
+ * Initialize the zoom controls.
+ * @param {number} bottom Distance from workspace bottom to bottom of controls.
+ * @return {number} Distance from workspace bottom to the top of controls.
+ */
+Blockly.ZoomControls.prototype.init = function(bottom) {
+  this.bottom_ = this.MARGIN_BOTTOM_ + bottom;
+  return this.bottom_ + this.HEIGHT_;
+};
+
+/**
+ * Dispose of this zoom controls.
+ * Unlink from all DOM elements to prevent memory leaks.
+ */
+Blockly.ZoomControls.prototype.dispose = function() {
+  if (this.svgGroup_) {
+    goog.dom.removeNode(this.svgGroup_);
+    this.svgGroup_ = null;
+  }
+  this.workspace_ = null;
+};
+
+/**
+ * Move the zoom controls to the bottom-right corner.
+ */
+Blockly.ZoomControls.prototype.position = function() {
+  var metrics = this.workspace_.getMetrics();
+  if (!metrics) {
+    // There are no metrics available (workspace is probably not visible).
+    return;
+  }
+  if (this.workspace_.RTL) {
+    this.left_ = this.MARGIN_SIDE_ + Blockly.Scrollbar.scrollbarThickness;
+    if (metrics.toolboxPosition == Blockly.TOOLBOX_AT_LEFT) {
+      this.left_ += metrics.flyoutWidth;
+      if (this.workspace_.toolbox_) {
+        this.left_ += metrics.absoluteLeft;
+      }
+    }
+  } else {
+    this.left_ = metrics.viewWidth + metrics.absoluteLeft -
+        this.WIDTH_ - this.MARGIN_SIDE_ - Blockly.Scrollbar.scrollbarThickness;
+
+    if (metrics.toolboxPosition == Blockly.TOOLBOX_AT_RIGHT) {
+      this.left_ -= metrics.flyoutWidth;
+    }
+  }
+  this.top_ = metrics.viewHeight + metrics.absoluteTop -
+      this.HEIGHT_ - this.bottom_;
+  if (metrics.toolboxPosition == Blockly.TOOLBOX_AT_BOTTOM) {
+    this.top_ -= metrics.flyoutHeight;
+  }
+  this.svgGroup_.setAttribute('transform',
+      'translate(' + this.left_ + ',' + this.top_ + ')');
+};