Start implementing rich-text editor
This commit is contained in:
Tobias Fella
committed by
James Graham
James Graham
parent
1f723d1fdf
commit
9cbe9f7280
249
src/libneochat/nestedlisthelper.cpp
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249
src/libneochat/nestedlisthelper.cpp
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/**
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* Nested list helper
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*
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* SPDX-FileCopyrightText: 2008 Stephen Kelly <steveire@gmail.com>
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#include "nestedlisthelper_p.h"
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#include <QKeyEvent>
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#include <QTextBlock>
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#include <QTextCursor>
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#include <QTextList>
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NestedListHelper::NestedListHelper()
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{
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listBottomMargin = 12;
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listTopMargin = 12;
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listNoMargin = 0;
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}
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bool NestedListHelper::handleBeforeKeyPressEvent(QKeyEvent *event, const QTextCursor &cursor)
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{
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// Only attempt to handle Backspace while on a list
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if ((event->key() != Qt::Key_Backspace) || (!cursor.currentList())) {
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return false;
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}
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bool handled = false;
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if (!cursor.hasSelection() && cursor.currentList() && event->key() == Qt::Key_Backspace && cursor.atBlockStart()) {
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handleOnIndentLess(cursor);
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handled = true;
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}
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return handled;
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}
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bool NestedListHelper::canIndent(const QTextCursor &textCursor) const
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{
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if ((textCursor.block().isValid())
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// && ( textEdit->textCursor().block().previous().isValid() )
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) {
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const QTextBlock block = textCursor.block();
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const QTextBlock prevBlock = textCursor.block().previous();
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if (block.textList()) {
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if (prevBlock.textList()) {
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return block.textList()->format().indent() <= prevBlock.textList()->format().indent();
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}
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} else {
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return true;
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}
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}
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return false;
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}
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bool NestedListHelper::canDedent(const QTextCursor &textCursor) const
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{
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QTextBlock thisBlock = textCursor.block();
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QTextBlock nextBlock = thisBlock.next();
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if (thisBlock.isValid()) {
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int nextBlockIndent = 0;
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if (nextBlock.isValid() && nextBlock.textList()) {
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nextBlockIndent = nextBlock.textList()->format().indent();
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}
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if (thisBlock.textList()) {
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const int thisBlockIndent = thisBlock.textList()->format().indent();
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if (thisBlockIndent >= nextBlockIndent) {
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return thisBlockIndent > 0;
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}
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}
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}
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return false;
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}
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bool NestedListHelper::handleAfterKeyPressEvent(QKeyEvent *event, const QTextCursor &cursor)
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{
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// Only attempt to handle Backspace and Return
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if ((event->key() != Qt::Key_Backspace) && (event->key() != Qt::Key_Return)) {
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return false;
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}
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bool handled = false;
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if (!cursor.hasSelection() && cursor.currentList()) {
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// Check if we're on the last list item.
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// itemNumber is zero indexed
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QTextBlock currentBlock = cursor.block();
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if (cursor.currentList()->count() == cursor.currentList()->itemNumber(currentBlock) + 1) {
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// Last block in this list, but may have just gained another list below.
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if (currentBlock.next().textList()) {
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reformatList(cursor.block());
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}
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reformatList(cursor.block());
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// No need to reformatList in this case. reformatList is slow.
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if ((event->key() == Qt::Key_Return) || (event->key() == Qt::Key_Backspace)) {
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handled = true;
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}
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} else {
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reformatList(cursor.block());
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}
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}
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return handled;
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}
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void NestedListHelper::processList(QTextList *list)
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{
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QTextBlock block = list->item(0);
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const int thisListIndent = list->format().indent();
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QTextCursor cursor = QTextCursor(block);
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list = cursor.createList(list->format());
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bool processingSubList = false;
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while (block.next().textList() != nullptr) {
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block = block.next();
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QTextList *nextList = block.textList();
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const int nextItemIndent = nextList->format().indent();
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if (nextItemIndent < thisListIndent) {
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return;
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} else if (nextItemIndent > thisListIndent) {
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if (processingSubList) {
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continue;
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}
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processingSubList = true;
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processList(nextList);
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} else {
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processingSubList = false;
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list->add(block);
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}
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}
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// delete nextList;
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// nextList = 0;
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}
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void NestedListHelper::reformatList(QTextBlock block)
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{
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if (block.textList()) {
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const int minimumIndent = block.textList()->format().indent();
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// Start at the top of the list
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while (block.previous().textList() != nullptr) {
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if (block.previous().textList()->format().indent() < minimumIndent) {
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break;
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}
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block = block.previous();
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}
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processList(block.textList());
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}
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}
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QTextCursor NestedListHelper::topOfSelection(QTextCursor cursor)
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{
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if (cursor.hasSelection()) {
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cursor.setPosition(qMin(cursor.position(), cursor.anchor()));
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}
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return cursor;
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}
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QTextCursor NestedListHelper::bottomOfSelection(QTextCursor cursor)
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{
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if (cursor.hasSelection()) {
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cursor.setPosition(qMax(cursor.position(), cursor.anchor()));
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}
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return cursor;
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}
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void NestedListHelper::handleOnIndentMore(const QTextCursor &textCursor)
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{
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QTextCursor cursor = textCursor;
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QTextListFormat listFmt;
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if (!cursor.currentList()) {
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QTextListFormat::Style style;
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cursor = topOfSelection(textCursor);
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cursor.movePosition(QTextCursor::PreviousBlock);
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if (cursor.currentList()) {
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style = cursor.currentList()->format().style();
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} else {
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cursor = bottomOfSelection(textCursor);
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cursor.movePosition(QTextCursor::NextBlock);
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if (cursor.currentList()) {
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style = cursor.currentList()->format().style();
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} else {
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style = QTextListFormat::ListDisc;
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}
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}
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handleOnBulletType(style, textCursor);
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} else {
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listFmt = cursor.currentList()->format();
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listFmt.setIndent(listFmt.indent() + 1);
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cursor.createList(listFmt);
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reformatList(textCursor.block());
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}
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}
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void NestedListHelper::handleOnIndentLess(const QTextCursor &textCursor)
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{
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QTextCursor cursor = textCursor;
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QTextList *currentList = cursor.currentList();
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if (!currentList) {
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return;
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}
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QTextListFormat listFmt = currentList->format();
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if (listFmt.indent() > 1) {
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listFmt.setIndent(listFmt.indent() - 1);
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cursor.createList(listFmt);
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reformatList(cursor.block());
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} else {
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QTextBlockFormat bfmt;
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bfmt.setObjectIndex(-1);
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cursor.setBlockFormat(bfmt);
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reformatList(cursor.block().next());
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}
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}
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void NestedListHelper::handleOnBulletType(int styleIndex, const QTextCursor &textCursor)
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{
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QTextCursor cursor = textCursor;
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if (styleIndex != 0) {
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auto style = static_cast<QTextListFormat::Style>(styleIndex);
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QTextList *currentList = cursor.currentList();
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QTextListFormat listFmt;
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cursor.beginEditBlock();
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if (currentList) {
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listFmt = currentList->format();
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listFmt.setStyle(style);
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currentList->setFormat(listFmt);
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} else {
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listFmt.setStyle(style);
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cursor.createList(listFmt);
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}
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cursor.endEditBlock();
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} else {
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QTextBlockFormat bfmt;
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bfmt.setObjectIndex(-1);
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cursor.setBlockFormat(bfmt);
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}
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reformatList(textCursor.block());
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}
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