Line-Height of Text in TextArea !

sierdzio

Don't worry about paintedHeight and implicitHeight for now, just use regular height.

Also how can I change the painted Height of TextArea ?

By modifying font size, adding more text, changing max number of lines, changing wrapping etc. There are many many ways.

AnonymousCoder

@sierdzio Yes Even I did that ..Changed to regular height but when I calculate paintedHeight in Console.log() function it is still showing me 60 which means line-height is still 20px right?
And how do I check that line height is changed?

sierdzio

And what does height show? Is it also 60?

Maybe set font size in pixels instead of font size? font.pixelSize: 22

AnonymousCoder

@sierdzio Just now I calculated the Textarea's height .It showed me 66 px .
But using

font.pixelSize:22px

The rectangle's height is changing to 108

console.log(textarea.paintedHeight)
console.log(parentrect.width)
console.log(textarea.heigh
console.log(parentrect.height)
console.log(textarea.lineCount)
QML Flickable: Binding loop detected for property "height"
qml: 60
qml: 288
qml: 66
qml: 78
qml: 3

sierdzio

@AnonymousCoder said in Line-Height of Text in TextArea !:

@sierdzio Just now I calculated the Textarea's height .It showed me 66 px .
But using
font.pixelSize:22px

22, no px - it's just a number.

The rectangle's height is changing to 108

That's probably because of all the padding you've added.

AnonymousCoder

@sierdzio This was the result earlier .

console.log(textarea.paintedHeight                     qml: 60
console.log(parentrect.width)                                qml: 288
 console.log(textarea.height)                                   qml: 66
  console.log(parentrect.height)                               qml: 78
   console.log(textarea.lineCount)                            qml: 3

And also this statement .Could you please clarify?
QML Flickable: Binding loop detected for property "height"

sierdzio

QML Flickable: Binding loop detected for property "height"

That means you set some property, which updates another, which sets the first prop again etc. - an infinite loop.

Hey wait, why is there a ScrollView there? Remove it, you don't need it. It is very likely to mess up with the logic here.

AnonymousCoder

@sierdzio Okay as You said I have removed the ScrollView But then If the text is more than the height of the Rectangle then it should scroll right .

So I have added ScrollBar inside Flickable .

Flickable {
       id:flickitem
       width: textarea.width
       height: textarea.height
       anchors.fill: parent
       boundsBehavior: Flickable.StopAtBounds
       flickableDirection: Flickable.HorizontalFlick
       interactive: true
       ScrollBar.vertical: Scrollbar{}
TextArea{...}

Scrollbar.qml

ScrollBar {
    id: control
    size: 0.3
    position: 0.2
    active: true
    orientation: Qt.Vertical
    anchors.right: parent.right

    contentItem: Rectangle {
        implicitWidth: 4
        implicitHeight: 76
        radius: width / 2
        color: control.pressed ? "#81e889" : "#c2f4c6"
    }
}

But still it is not scrolling .

sierdzio

@AnonymousCoder said in Line-Height of Text in TextArea !:

Scrollbar.qml

You don't need that, there is https://doc.qt.io/qt-5/qml-qtquick-controls2-scrollbar.html. As said, keep custom code to minimum until you make it work.

Flickable {
id:flickitem
width: textarea.width
height: textarea.height

You set TextArea size to be the same as Flickable - so there is nothing to scroll - the entire text area will be shown.

You need to make the Flickable smaller than TextArea, then set Flickable's contentHeight and contentWidth to match that of TextArea.

AnonymousCoder

This post is deleted!

AnonymousCoder

@sierdzio As you said I kept the code as minimum as possible and I tried to do it from scratch.
so for now I have given only TextArea{} and its background:Rectangle{}

Which I have shared here with the results.

TextArea{
        id:area
        width: 288
        height: 22*area.lineCount
        font.pixelSize: 16
        font.family: "GE Inspira Sans"
        topPadding: 6
        bottomPadding: 6
        leftPadding: 12
        rightPadding: 12
        text: "Lorem ipsum dolor sit amet, conse ctetur adipiscing elit, sed do eiusmod tempor incididunt ut labor."
        wrapMode: TextArea.WordWrap
        background: Rectangle{
            id:rect
            width: 288
            height: 78
            border.color: "black"
        }
        Component.onCompleted: {
            console.log(area.paintedHeight)
            console.log(area.height)
            console.log(rect.height)

        }

     }

Results :

qml: 60
qml: 66
qml: 78

And suppose if I get line-height correctly also then how should I check whether it is correct or not?
Is there any way to implement Html here in TextArea?

Also I have shared a link to images which I need ( See images with Black background) and those with the above code (see images with white background).
Click here

AnonymousCoder

@sierdzio Hi , Actually I tried many ways but I got something which is not fully working but still 50% of work is fine .

i am using css property inside text: like

text: "<body style=\"line-height:137.5% ;\">"

but i am not sure this is the correct way to do or not .
And now the issue is when I use 137.5% which is 22px line-height then always the 3rd line comes half when the application runs .
So how to fix that ?

AnonymousCoder

HI @sierdzio and anyone who is watching this thread.
I got one solution on how to achieve line-height of text inside TextArea.
I took help from QTextDocument and tried to use it but there is one limitation with this solution.
Actually when I tried to use the keyboard operations (undo,redo,cut,copy,paste,select-all) then every operation is working but when i tried paste operations (cut-paste, copy-paste ) then the undo, redo operations won't work . They will only work again when I do select-all operation. so this is the limitation with this solution.

Now When you see the code in TextDoc.cpp there you will find 2 statements which contains setUndoRedoEnabled(false) & setUndoRedoEnabled(true) . Here the question arises that why playing with Undo, Redo is needed ? So the answer is its needed because if I dont give these lines then after the paste operation the line-height property is lost ...therefore to achieve it we need that .

Again the issue is still "How to achieve line-height of Text in TextArea?" But if you have solution to the above Undo , Redo issue ...Then please help .
Thanks !

Mail.Qml

import QtQuick 2.15
import QtQuick.Window 2.15
import QtQuick.Controls 2.12
import TextDoc 1.0

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")
    property int cursor_pos: 0
    property bool pasted: false
    property int prev_len: 0
    property int pix: 50

    function fun(s) {
        return (s).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
    }

    ScrollView {
        y:200
        clip: true
        width: 600
        height: 400

        TextArea {
            id: ta
            width: 600
            height: 400
            wrapMode: Text.WrapAnywhere
            textFormat: TextEdit.PlainText
            placeholderText: "Hint Text"
            text: "sdfffffffffffffff dsf sdf sdf \n sdfdsfdsffsd\n dsfdsfdsfdsfdsfdsfdfdsfsdfdssssssssssssssssssssssssssssss"
            font.pixelSize: 16
            font.family: "courier"
            background: Rectangle {
                width: 600
                height: 400
                border.color: "blue"
            }
            Keys.onPressed: {
                if ( (event.key === Qt.Key_V) && (event.modifiers  & Qt.ControlModifier ) ) {
                    pasted = true;

                }
            }
            Keys.onReleased: {
               if ((event.key === Qt.Key_V) && (pasted)){
                   pasted = false;
                   tdoc.onCompleted(pix);
               }
            }

            TextDoc {
                id: tdoc
            }

            Component.onCompleted: {
                tdoc.setTDoc(ta.textDocument);
                tdoc.onCompleted(pix);
            }


        }
    }
}

TextDoc.h

#include <QTextDocument>
#include <QQuickTextDocument>
#include <QDebug>

class TextDo : public QObject
{
Q_OBJECT
public:
    explicit TextDo(QObject* parent = nullptr);

    static void registerQmlType();

    Q_INVOKABLE void onCompleted(int c);

    Q_INVOKABLE void setTDoc(QQuickTextDocument* newTDoc) {
        qDebug() << "setTDoc called";

        tDoc = newTDoc;
    };

private:
    QQuickTextDocument *tDoc;
};

TextDoc.cpp

#include "TextDoc.h"
#include <QTextFrame>


void TextDo::onCompleted(int c)
{
    qDebug() << "onCompleted called";


    tDoc->textDocument()->setUndoRedoEnabled(false);

    QTextBlockFormat blockFmt = QTextBlockFormat();
    blockFmt.setLineHeight(c, QTextBlockFormat::FixedHeight);

    QTextCursor theCursor(tDoc->textDocument());
    theCursor.clearSelection();
    theCursor.select(QTextCursor::Document);
    theCursor.mergeBlockFormat(blockFmt);

    tDoc->textDocument()->setUndoRedoEnabled(true);
}

TextDo::TextDo(QObject *parent)
{

}

void TextDo::registerQmlType()
{
    qmlRegisterType<TextDo>("TextDoc", 1, 0, "TextDoc");
}

In Main.cpp just add 1 more statement

TextDo::registerQmlType();

AnonymousCoder

Hey @sierdzio
I have found the solution to this generic issue which is "How to achieve line - height of Text in Textarea or Textbox or Textedit (Editable items) ?" .
Actually frankly speaking we don't have a direct solution for this so we will use something which is a bit complicated.

Based on my previous comment I would like to add something that the above code is the solution for this issue but there we will have to add some more 2-3 lines of code because previous solution has some issues actually.

Main.qml

import QtQuick 2.15
import QtQuick.Window 2.15
import QtQuick.Controls 2.12
import TextDoc 1.0

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")
    property int cursor_pos: 0
    property bool pasted: false
    property int prev_len: 0
    property int pix: 50

    function fun(s) {
        return (s).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
    }

    ScrollView {
        y:200
        clip: true
        width: 600
        height: 400

        TextArea {
            id: ta
            width: 600
            height: 400
            wrapMode: Text.WrapAnywhere
            textFormat: TextEdit.PlainText
            placeholderText: "Hint Text"
            text: "sdfffffffffffffff dsf sdf sdf \n sdfdsfdsffsd\n dsfdsfdsfdsfdsfdsfdfdsfsdfdssssssssssssssssssssssssssssss"
            font.pixelSize: 16
            font.family: "courier"
            background: Rectangle {
                width: 600
                height: 400
                border.color: "blue"
            }
            Keys.onPressed: {
                if ( (event.key === Qt.Key_V) && (event.modifiers  & Qt.ControlModifier ) ) {
                    event.accepted = true;
                    pasted = true;

                }
            }
            Keys.onReleased: {
               if ((event.key === Qt.Key_V) && (pasted)){
                   event.accepted = true;
                   pasted = false;
                   tdoc.pasteText(cursorPosition, selectionStart, selectionEnd);
               }
            }

            TextDoc {
                id: tdoc
            }

            Component.onCompleted: {
                tdoc.setTDoc(ta.textDocument);
                tdoc.onCompleted(pix);
            }


        }
    }
}

TextDoc.h

TextDoc.h

#include <QTextDocument>
#include <QQuickTextDocument>
#include <QDebug>

class TextDo : public QObject
{
Q_OBJECT
public:
    explicit TextDo(QObject* parent = nullptr);

    static void registerQmlType();

    Q_INVOKABLE void onCompleted(int c);
    
    Q_INVOKABLE void pasteText(int pos, int selectionStart, int selectionEnd);

    Q_INVOKABLE void setTDoc(QQuickTextDocument* newTDoc) {
        qDebug() << "setTDoc called";

        tDoc = newTDoc;
    };

private:
    QQuickTextDocument *tDoc;
};

TextDoc.cpp

#include "TextDoc.h"
#include <QTextFrame>


void TextDo::onCompleted(int c)
{
    qDebug() << "onCompleted called";


    tDoc->textDocument()->setUndoRedoEnabled(false);

    QTextBlockFormat blockFmt = QTextBlockFormat();
    blockFmt.setLineHeight(c, QTextBlockFormat::FixedHeight);

    QTextCursor theCursor(tDoc->textDocument());
    theCursor.clearSelection();
    theCursor.select(QTextCursor::Document);
    theCursor.mergeBlockFormat(blockFmt);

    tDoc->textDocument()->setUndoRedoEnabled(true);
}
void TextDoc::pasteText(int pos, int selectionStart, int selectionEnd)  {

const QString text = QGuiApplication::clipboard()->text()
if(text.isNull()) {
return;
}
QTextCursor theCursor(tDoc->textDocument());
if(selectionStart >=  0 && selectionEnd >= 0) {
   theCursor.setPosition(selectionStart, QTextCursor::MoveAnchor);
   theCursor.setPosition(selectionEnd, QTextCursor::KeepAnchor);
} else {
  theCursor.setPosition(pos);
}
theCursor.beginEditBlock();
theCursor.insertText(text);
theCursor.endEditBlock();
}


TextDo::TextDo(QObject *parent)
{

}

void TextDo::registerQmlType()
{
    qmlRegisterType<TextDo>("TextDoc", 1, 0, "TextDoc");
}

In Main.cpp just add 1 more statement

TextDo::registerQmlType();

Therefore in the above code you can see I have added one more function to TextDoc class which is pasteText() , it actually pastes the text to the clipboard and then tries to apply other clipboard operations.
So this solution is working fine for me and I hope it works for others too.

Thanks @sierdzio for helping me and others who are watching this thread.