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/**
* @license
* Visual Blocks Editor
*
* Copyright 2013 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 A div that floats on top of Blockly. This singleton contains
* temporary HTML UI widgets that the user is currently interacting with.
* E.g. text input areas, colour pickers, context menus.
* @author fraser@google.com (Neil Fraser)
*/
'use strict';
goog.provide('Blockly.WidgetDiv');
goog.require('Blockly.Css');
goog.require('goog.dom');
goog.require('goog.dom.TagName');
goog.require('goog.style');
/**
* The HTML container. Set once by Blockly.WidgetDiv.createDom.
* @type {Element}
*/
Blockly.WidgetDiv.DIV = null;
/**
* The object currently using this container.
* @type {Object}
* @private
*/
Blockly.WidgetDiv.owner_ = null;
/**
* Optional cleanup function set by whichever object uses the widget.
* @type {Function}
* @private
*/
Blockly.WidgetDiv.dispose_ = null;
/**
* Create the widget div and inject it onto the page.
*/
Blockly.WidgetDiv.createDom = function() {
if (Blockly.WidgetDiv.DIV) {
return; // Already created.
}
// Create an HTML container for popup overlays (e.g. editor widgets).
Blockly.WidgetDiv.DIV =
goog.dom.createDom(goog.dom.TagName.DIV, 'blocklyWidgetDiv');
document.body.appendChild(Blockly.WidgetDiv.DIV);
};
/**
* Initialize and display the widget div. Close the old one if needed.
* @param {!Object} newOwner The object that will be using this container.
* @param {boolean} rtl Right-to-left (true) or left-to-right (false).
* @param {Function} dispose Optional cleanup function to be run when the widget
* is closed.
*/
Blockly.WidgetDiv.show = function(newOwner, rtl, dispose) {
Blockly.WidgetDiv.hide();
Blockly.WidgetDiv.owner_ = newOwner;
Blockly.WidgetDiv.dispose_ = dispose;
// Temporarily move the widget to the top of the screen so that it does not
// cause a scrollbar jump in Firefox when displayed.
var xy = goog.style.getViewportPageOffset(document);
Blockly.WidgetDiv.DIV.style.top = xy.y + 'px';
Blockly.WidgetDiv.DIV.style.direction = rtl ? 'rtl' : 'ltr';
Blockly.WidgetDiv.DIV.style.display = 'block';
};
/**
* Destroy the widget and hide the div.
*/
Blockly.WidgetDiv.hide = function() {
if (Blockly.WidgetDiv.owner_) {
Blockly.WidgetDiv.owner_ = null;
Blockly.WidgetDiv.DIV.style.display = 'none';
Blockly.WidgetDiv.DIV.style.left = '';
Blockly.WidgetDiv.DIV.style.top = '';
Blockly.WidgetDiv.dispose_ && Blockly.WidgetDiv.dispose_();
Blockly.WidgetDiv.dispose_ = null;
goog.dom.removeChildren(Blockly.WidgetDiv.DIV);
}
};
/**
* Is the container visible?
* @return {boolean} True if visible.
*/
Blockly.WidgetDiv.isVisible = function() {
return !!Blockly.WidgetDiv.owner_;
};
/**
* Destroy the widget and hide the div if it is being used by the specified
* object.
* @param {!Object} oldOwner The object that was using this container.
*/
Blockly.WidgetDiv.hideIfOwner = function(oldOwner) {
if (Blockly.WidgetDiv.owner_ == oldOwner) {
Blockly.WidgetDiv.hide();
}
};
/**
* Position the widget at a given location. Prevent the widget from going
* offscreen top or left (right in RTL).
* @param {number} anchorX Horizontal location (window coorditates, not body).
* @param {number} anchorY Vertical location (window coorditates, not body).
* @param {!goog.math.Size} windowSize Height/width of window.
* @param {!goog.math.Coordinate} scrollOffset X/y of window scrollbars.
* @param {boolean} rtl True if RTL, false if LTR.
*/
Blockly.WidgetDiv.position = function(anchorX, anchorY, windowSize,
scrollOffset, rtl) {
// Don't let the widget go above the top edge of the window.
if (anchorY < scrollOffset.y) {
anchorY = scrollOffset.y;
}
if (rtl) {
// Don't let the widget go right of the right edge of the window.
if (anchorX > windowSize.width + scrollOffset.x) {
anchorX = windowSize.width + scrollOffset.x;
}
} else {
// Don't let the widget go left of the left edge of the window.
if (anchorX < scrollOffset.x) {
anchorX = scrollOffset.x;
}
}
Blockly.WidgetDiv.DIV.style.left = anchorX + 'px';
Blockly.WidgetDiv.DIV.style.top = anchorY + 'px';
Blockly.WidgetDiv.DIV.style.height = windowSize.height + 'px';
};
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