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Viewer: Calculate default column widths based on current font size

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Kovid Goyal 2020-02-18 08:15:09 +05:30
parent 3d93979fdb
commit ea7ad6fc0a
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1 changed files with 21 additions and 1 deletions
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22
src/pyj/read_book/paged_mode.pyj
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@ -119,6 +119,26 @@ def fit_images():
set_elem_data(img, 'height-limited', True)
def cps_by_em_size():
ans = cps_by_em_size.ans
fs = window.getComputedStyle(document.body).fontSize
if not ans or cps_by_em_size.at_font_size is not fs:
d = document.createElement('span')
d.style.position = 'absolute'
d.style.visibility = 'hidden'
d.style.width = '1rem'
d.style.fontSize = '1rem'
d.style.paddingTop = d.style.paddingBottom = d.style.paddingLeft = d.style.paddingRight = '0'
d.style.marginTop = d.style.marginBottom = d.style.marginLeft = d.style.marginRight = '0'
d.style.borderStyle = 'none'
document.body.appendChild(d)
w = d.clientWidth
document.body.removeChild(d)
ans = cps_by_em_size.ans = max(2, w)
cps_by_em_size.at_font_size = fs
return ans
def calc_columns_per_screen():
cps = opts.columns_per_screen or {}
cps = cps.landscape if scroll_viewport.width() > scroll_viewport.height() else cps.portrait
@ -127,7 +147,7 @@ def calc_columns_per_screen():
except:
cps = 0
if not cps:
cps = int(Math.floor(scroll_viewport.width() / 500.0))
cps = int(Math.floor(scroll_viewport.width() / (35 * cps_by_em_size())))
cps = max(1, min(cps or 1, 20))
return cps