mirror of
https://github.com/scratchfoundation/scratch-blocks.git
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127 lines
3.8 KiB
JavaScript
127 lines
3.8 KiB
JavaScript
/**
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* @license
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* Visual Blocks Editor
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*
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* Copyright 2013 Google Inc.
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* https://developers.google.com/blockly/
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview A div that floats on top of Blockly. This singleton contains
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* temporary HTML UI widgets that the user is currently interacting with.
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* E.g. text input areas, colour pickers, context menus.
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* @author fraser@google.com (Neil Fraser)
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*/
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'use strict';
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goog.provide('Blockly.WidgetDiv');
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goog.require('Blockly.Css');
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goog.require('goog.dom');
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/**
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* The HTML container. Set once by inject.js's Blockly.createDom_.
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* @type Element
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*/
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Blockly.WidgetDiv.DIV = null;
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/**
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* The object currently using this container.
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* @private
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* @type Object
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*/
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Blockly.WidgetDiv.owner_ = null;
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/**
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* Optional cleanup function set by whichever object uses the widget.
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* @private
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* @type Function
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*/
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Blockly.WidgetDiv.dispose_ = null;
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/**
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* Initialize and display the widget div. Close the old one if needed.
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* @param {!Object} newOwner The object that will be using this container.
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* @param {Function} dispose Optional cleanup function to be run when the widget
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* is closed.
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*/
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Blockly.WidgetDiv.show = function(newOwner, dispose) {
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Blockly.WidgetDiv.hide();
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Blockly.WidgetDiv.owner_ = newOwner;
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Blockly.WidgetDiv.dispose_ = dispose;
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Blockly.WidgetDiv.DIV.style.display = 'block';
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};
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/**
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* Destroy the widget and hide the div.
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*/
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Blockly.WidgetDiv.hide = function() {
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if (Blockly.WidgetDiv.owner_) {
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Blockly.WidgetDiv.DIV.style.display = 'none';
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Blockly.WidgetDiv.dispose_ && Blockly.WidgetDiv.dispose_();
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Blockly.WidgetDiv.owner_ = null;
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Blockly.WidgetDiv.dispose_ = null;
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goog.dom.removeChildren(Blockly.WidgetDiv.DIV);
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}
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};
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/**
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* Is the container visible?
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* @return {boolean} True if visible.
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*/
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Blockly.WidgetDiv.isVisible = function() {
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return !!Blockly.WidgetDiv.owner_;
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};
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/**
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* Destroy the widget and hide the div if it is being used by the specified
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* object.
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* @param {!Object} oldOwner The object that was using this container.
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*/
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Blockly.WidgetDiv.hideIfOwner = function(oldOwner) {
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if (Blockly.WidgetDiv.owner_ == oldOwner) {
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Blockly.WidgetDiv.hide();
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}
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};
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/**
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* Position the widget at a given location. Prevent the widget from going
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* offscreen top or left (right in RTL).
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* @param {number} anchorX Horizontal location (window coorditates, not body).
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* @param {number} anchorY Vertical location (window coorditates, not body).
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* @param {!goog.math.Size} windowSize Height/width of window.
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* @param {!goog.math.Coordinate} scrollOffset X/y of window scrollbars.
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*/
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Blockly.WidgetDiv.position = function(anchorX, anchorY, windowSize,
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scrollOffset) {
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// Don't let the widget go above the top edge of the window.
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if (anchorY < scrollOffset.y) {
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anchorY = scrollOffset.y;
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}
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if (Blockly.RTL) {
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// Don't let the menu go right of the right edge of the window.
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if (anchorX > windowSize.width + scrollOffset.x) {
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anchorX = windowSize.width + scrollOffset.x;
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}
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} else {
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// Don't let the widget go left of the left edge of the window.
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if (anchorX < scrollOffset.x) {
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anchorX = scrollOffset.x;
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}
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}
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Blockly.WidgetDiv.DIV.style.left = anchorX + 'px';
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Blockly.WidgetDiv.DIV.style.top = anchorY + 'px';
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};
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