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block.js
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block.js
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import {
EditorState,
RichUtils,
Modifier,
DefaultDraftBlockRenderMap,
} from 'draft-js';
import { List, Map } from 'immutable';
/**
* Function returns collection of currently selected blocks.
*/
export function getSelectedBlocksMap(editorState) {
const selectionState = editorState.getSelection();
const contentState = editorState.getCurrentContent();
const startKey = selectionState.getStartKey();
const endKey = selectionState.getEndKey();
const blockMap = contentState.getBlockMap();
return blockMap
.toSeq()
.skipUntil((_, k) => k === startKey)
.takeUntil((_, k) => k === endKey)
.concat([[endKey, blockMap.get(endKey)]]);
}
/**
* Function returns collection of currently selected blocks.
*/
export function getSelectedBlocksList(editorState) {
return getSelectedBlocksMap(editorState).toList();
}
/**
* Function returns the first selected block.
*/
export function getSelectedBlock(editorState) {
if (editorState) {
return getSelectedBlocksList(editorState).get(0);
}
return undefined;
}
/**
* Function returns the block just before the selected block.
*/
export function getBlockBeforeSelectedBlock(editorState) {
if (editorState) {
const selectedBlock = getSelectedBlock(editorState);
const contentState = editorState.getCurrentContent();
const blockList = contentState
.getBlockMap()
.toSeq()
.toList();
let previousIndex = 0;
blockList.forEach((block, index) => {
if (block.get('key') === selectedBlock.get('key')) {
previousIndex = index - 1;
}
});
if (previousIndex > -1) {
return blockList.get(previousIndex);
}
}
return undefined;
}
/**
* Function returns list of all blocks in the editor.
*/
export function getAllBlocks(editorState) {
if (editorState) {
return editorState
.getCurrentContent()
.getBlockMap()
.toList();
}
return new List();
}
/**
* If all currently selected blocks are of same type the function will return their type,
* Else it will return empty string.
*/
export function getSelectedBlocksType(editorState) {
const blocks = getSelectedBlocksList(editorState);
const hasMultipleBlockTypes = blocks.some(
block => block.type !== blocks.get(0).type
);
if (!hasMultipleBlockTypes) {
return blocks.get(0).type;
}
return undefined;
}
/**
* Function will change block style to unstyled for selected blocks.
* RichUtils.tryToRemoveBlockStyle does not workd for blocks of length greater than 1.
*/
export function removeSelectedBlocksStyle(editorState) {
const newContentState = RichUtils.tryToRemoveBlockStyle(editorState);
if (newContentState) {
return EditorState.push(editorState, newContentState, 'change-block-type');
}
return editorState;
}
/**
* Function will return currently selected text in the editor.
*/
export function getSelectionText(editorState) {
let selectedText = '';
const currentSelection = editorState.getSelection();
let start = currentSelection.getAnchorOffset();
let end = currentSelection.getFocusOffset();
const selectedBlocks = getSelectedBlocksList(editorState);
if (selectedBlocks.size > 0) {
if (currentSelection.getIsBackward()) {
const temp = start;
start = end;
end = temp;
}
for (let i = 0; i < selectedBlocks.size; i += 1) {
const blockStart = i === 0 ? start : 0;
const blockEnd =
i === selectedBlocks.size - 1
? end
: selectedBlocks.get(i).getText().length;
selectedText += selectedBlocks
.get(i)
.getText()
.slice(blockStart, blockEnd);
}
}
return selectedText;
}
/**
* Function will handle followind keyPress scenario:
* case Shift+Enter, select not collapsed ->
* selected text will be removed and line break will be inserted.
*/
export function addLineBreakRemovingSelection(editorState) {
const content = editorState.getCurrentContent();
const selection = editorState.getSelection();
let newContent = Modifier.removeRange(content, selection, 'forward');
const fragment = newContent.getSelectionAfter();
const block = newContent.getBlockForKey(fragment.getStartKey());
newContent = Modifier.insertText(
newContent,
fragment,
'\n',
block.getInlineStyleAt(fragment.getStartOffset()),
null
);
return EditorState.push(editorState, newContent, 'insert-fragment');
}
/**
* Function will inset a new unstyled block.
*/
export function insertNewUnstyledBlock(editorState) {
const newContentState = Modifier.splitBlock(
editorState.getCurrentContent(),
editorState.getSelection()
);
const newEditorState = EditorState.push(
editorState,
newContentState,
'split-block'
);
return removeSelectedBlocksStyle(newEditorState);
}
/**
* Function will clear all content from the editor.
*/
export function clearEditorContent(editorState) {
const blocks = editorState
.getCurrentContent()
.getBlockMap()
.toList();
const updatedSelection = editorState.getSelection().merge({
anchorKey: blocks.first().get('key'),
anchorOffset: 0,
focusKey: blocks.last().get('key'),
focusOffset: blocks.last().getLength(),
});
const newContentState = Modifier.removeRange(
editorState.getCurrentContent(),
updatedSelection,
'forward'
);
return EditorState.push(editorState, newContentState, 'remove-range');
}
/**
* Function will add block level meta-data.
*/
export function setBlockData(editorState, data) {
const newContentState = Modifier.setBlockData(
editorState.getCurrentContent(),
editorState.getSelection(),
data
);
return EditorState.push(editorState, newContentState, 'change-block-data');
}
/**
* Function will return currently selected blocks meta data.
*/
export function getSelectedBlocksMetadata(editorState) {
let metaData = new Map({});
const selectedBlocks = getSelectedBlocksList(editorState);
if (selectedBlocks && selectedBlocks.size > 0) {
for (let i = 0; i < selectedBlocks.size; i += 1) {
const data = selectedBlocks.get(i).getData();
if (!data || data.size === 0) {
metaData = metaData.clear();
break;
}
if (i === 0) {
metaData = data;
} else {
metaData.forEach((value, key) => {
// eslint-disable-line no-loop-func
if (!data.get(key) || data.get(key) !== value) {
metaData = metaData.delete(key);
}
});
if (metaData.size === 0) {
metaData = metaData.clear();
break;
}
}
}
}
return metaData;
}
const newBlockRenderMap = Map({
code: {
element: 'pre',
},
});
export const blockRenderMap = DefaultDraftBlockRenderMap.merge(
newBlockRenderMap
);