how do i make a full text area scroll up when i add more text?
73 ビュー (過去 30 日間)
i designed a gui for running automated tests using App Designer. it writes messages to a text area. after the text area fills up, it continues add the text to the bottom of the text array and adds a scroll bar on the right of the text area. all new text is added off-screen, below the bottom of the displayed text area and you have manually scroll to see any new messages. how do I make it automatically scroll, so that you always see the new messages without have to keep scrolling it manually?
その他の回答 (4 件)
Eric Sargent 2020 年 12 月 9 日
編集済み: Eric Sargent 2020 年 12 月 9 日
As of R2020b uitextarea now supports scroll.
In this case you could use:
Ted Shultz 2018 年 6 月 4 日
I had the exact same issue. My crude work around was to add the new text to the start rather than the end of the text block. As new lines are added (now to the top) they remain visible as the scroll bar stays at the top and the older entries go down. I maintained two separate text objects, one (added to the bottom) for saving a text file, and one added to the top for displaying in the app designer window. Because all my events include a timestamp, it is not as bad as you may think. BUT yes, I completely agree with the implied premise of this question, of "can I set scroll = 100". I also would have liked this feature.
Walter Roberson 2017 年 8 月 1 日
I have not looked at this using app designer. If you were doing it outside of app designer you would have two choices:
1) go in at the Java level to adjust the properties of the Java swing object; or
2) put the text area inside a uipanel that is inside a second uipanel, and as you add text, keep making the text area larger so that it does not create scroll bars, and set the position of the inner uipanel so that the bottom of it is visible inside the outer uipanel. The outer uipanel works like a frame allowing only a fixed size of the inner panel to be visible.
Mark Myong-Sik Otero 2019 年 9 月 9 日
Hi there's an easy workaround that I implemented:
% Append to Text Area
msg = 'Hello World';
% Where app.taLog is a TextArea component
app.taLog.Value = [msg;app.taLog.Value];