[New-bugs-announce] [issue22628] Idle: Tree lines are spaced too close together.

[Terry J. Reedy]

New submission from Terry J. Reedy:

(Mentioned on #16233) At least on my windows 7 system, the lines of idlelib.TreeWidget, used for Path Browser and Class (Module) Browser, are spaced too narrowly.  They are so close together that they overlap and each cuts off enough of the line above to make reading difficult.

TreeWidget is actually a canvas painted with icons, connecting lines, and lines of text. There is no automatic spacing of text lines as with tkinter.Text.  A comment in the draw method notes "XXX This hard-codes too many geometry constants!".

The attached patch changes two of the constants.  Increasing dy spreads the line apart a bit so there is very little clipping. (Both g and y are sometimes complete, sometimes not.) The other change moves the lines up relative to the icons so they are not offset.

Saimadhav, does this change look ok on linux?

I think the long term fix (before 3.5) is to use ttk.Treeview.  So I am not inclined to spend lots of time fine-tuning on various systems or adding user configuration (though we might for Treeview).  However, dy could be made conditional on, for instance, sys.platform[0:3] == 'win'.

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assignee: terry.reedy
files: atree.diff
keywords: patch
messages: 229277
nosy: sahutd, terry.reedy
priority: normal
severity: normal
stage: patch review
status: open
title: Idle: Tree lines are spaced too close together.
type: behavior
versions: Python 2.7, Python 3.4, Python 3.5
Added file: http://bugs.python.org/file36905/atree.diff

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<http://bugs.python.org/issue22628>
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