How to judge there is content in QTextEdit?

victor wang

Hi All,
I'm trying to judge whether there is content in QTextEdit or not.
If there is content inside, I want to use "append" to show more information in TextEdit.
If not then I want to use "SetText" to show it.

How can I do that?
Is there any element like "isEmpty"?

JKSH

@victor-wang said in How to judge there is content in QTextEdit?:

If there is content inside, I want to use "append" to show more information in TextEdit.
If not then I want to use "SetText" to show it.

Why? append() still works when the QTextEdit is empty.

Is there any element like "isEmpty"?

Not quite, but you can call textEdit->document()->characterCount();

Note: Empty documents have characterCount() == 1 (not 0)

victor wang

@JKSH
I did try to use append to show text in empty QTextEdit.
However, it didn't show anything unless I use "Settext" at the first time then "append".
This confused me too.
That's why I try to get another way to solve it.

JKSH

@victor-wang said in How to judge there is content in QTextEdit?:

However, it didn't show anything unless I use "Settext" at the first time then "append".

That's strange. Which version of Qt? This code works for me on Qt 5.12.0 (MinGW 7.3.0, 64-bit):

QTextEdit e;
e.append("Hello");
e.show();