harbour-fernschreiber/qml/components/MultilineEmojiLabel.qml

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/*
Copyright (C) 2020 Slava Monich and other contributors
This file is part of Fernschreiber.
Fernschreiber is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Fernschreiber is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Fernschreiber. If not, see <http://www.gnu.org/licenses/>.
*/
import QtQuick 2.0
import Sailfish.Silica 1.0
import "../js/twemoji.js" as Emoji
// Combination of maximumLineCount and TruncationMode.Elide (or Fade) breaks
// Emoji image alignment, pushing the image down. This one aligns the image
// correctly on its line.
Label {
property string rawText
property int maxLineCount
wrapMode: Text.Wrap
textFormat: Text.StyledText
truncationMode: TruncationMode.Elide
// lineCount is unreliable for StyledText with images and line breaks
readonly property int fontSize: font.pixelSize
readonly property int actualLineHeight: (text === rawText) ? fontSize : (fontSize * 6 / 5)
readonly property int actualLineCount: Math.floor(implicitHeight/actualLineHeight)
Component.onCompleted: refitText()
onFontSizeChanged: refitText()
onWidthChanged: refitText()
onRawTextChanged: refitText()
onMaxLineCountChanged: refitText()
function emojify(str) {
return Emoji.emojify(str, fontSize)
}
function refitText() {
text = emojify(rawText)
if (maxLineCount > 0) {
var divisor = 1
var max = rawText.length
var min = max
while (actualLineCount > maxLineCount && divisor < rawText.length) {
max = min
divisor++
min = rawText.length/divisor
text = emojify(rawText.substr(0, min) + "…")
}
while (min < max) {
var mid = Math.floor((min + max)/2)
if (mid === min) {
text = emojify(rawText.substr(0, min) + "…")
break
} else {
text = emojify(rawText.substr(0, mid) + "…")
if (actualLineCount > maxLineCount) {
max = mid
} else {
min = mid
}
}
}
}
}
}