Sorry for so many small mails on one topic.

In my current project, I implements something similar to line numbers.
At the beginning, I separate them into different canvases so that the GUI
behaves like iTunes(later I found that they do not implement it in a
consistent way), but now I like the way that racket already provides, to
override the (on-paint) method of text%, its first argument gives the
change to draw something before or after the text% itself is displayed.

On Thu, Mar 9, 2017 at 9:51 AM, WarGrey Gyoudmon Ju <juzhenli...@gmail.com>
wrote:

> Okay, in the gui framework, there is an interface text:line-numbers<%>
>
> On Thu, Mar 9, 2017 at 9:46 AM, WarGrey Gyoudmon Ju <juzhenli...@gmail.com
> > wrote:
>
>> But sometimes I happened to see that some one-line codes and their line
>> number are overlapped.
>> And line numbers are also controlled by the same horizontal scrollbar(I
>> mean, it is contained in the scrollbar's view, if there is another canvas
>> this should not happen).
>>
>> Maybe they are displayed in a special image box(also, those non-string
>> snips may produce lines that bigger than text line height).
>>
>> On Thu, Mar 9, 2017 at 9:31 AM, WarGrey Gyoudmon Ju <
>> juzhenli...@gmail.com> wrote:
>>
>>> I think, line numbers are likely displayed in another canvas.
>>> The current implementation of text% does not support advanced font
>>> features, the line height therefore is always the same. Displaying the line
>>> numbers just consists of a bit of arithmetic.
>>>
>>> On Thu, Mar 9, 2017 at 8:31 AM, 武晓宇 <guluguluc...@gmail.com> wrote:
>>>
>>>>   I want to implement a text% object. And display the line number when
>>>> string is inserted the text/canvas area.
>>>>   Like the DrRacket IDE in "show line number" mode.
>>>>   I read the source code of DrRacket but do not find the answer. Could
>>>> anyone give a hand?
>>>>
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>>>
>>>
>>
>

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