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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_ + ')');
};
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