qt - QMainWindow.saveState() / .restoreState() handle central widget incorrectly -

-

i'm struggling qmainwindow , qdockwidgets, seems messy area.

i need simple thing: when application closed, arrangement of dockwidgets should saved, , when application opened, arrangement should restored.

the problem savestate()/restorestate() methods deal strangely central widget. there several variants, , each has own problems:

1. central widget set to, say, qplaintextedit or qlabel

when state restored, dockwidgets occupy horizontal space possible, thin central widget in middle of left , right dockwidgets. size , position of central widget kept vertically, horizontal boundaries between dockwidgets , central widget not saved.

2. central widget set null

if explicitly call: 

this->setcentralwidget(null);

then statesave()/staterestore() work: state saved , restored correctly, strange reason user unable dock widgets @ top or bottom. widgets can docked in 1 horizontal row, no matter how hard try dock @ top or bottom.

3. no central widget

by "no central widget" mean not touching central widget @ all. reason, behavior different comparing null central widget:

state saved , restored correctly, if make window small, , expand again, dockwidgets remain small huge unused area in middle. so, user have resize them manually.

all of looks strange. i'll have go "no central widget" variant, i'm confused because don't understand behavior, maybe it's bug, , then, behavior may change in future versions.

so, each of these ways has own problems. if can give me clue on solving of them, i'd glad.


Comments

Post a Comment

Popular posts from this blog

php - Zend Framework / Skeleton-Application / Composer install issue -

-
i trying create zend framework application using skeleton in netbeans. when run composer install, following error message: "c:\php\php.exe" "c:\composer\composer.phar" "--ansi" "--no-interaction" "update" "--dev" using deprecated option "dev". dev packages installed default now. loading composer repositories package information updating dependencies (including require-dev) requirements not resolved installable set of packages. problem 1 - package requires php >=5.5 php version (5.4.42) not satisfy requirement. problem 2 - installation request zendframework/zendframework 2.5.1 -> satisfiable zendframework/zendframework[2.5.1]. - zendframework/zendframework 2.5.1 requires php >=5.5 -> php version (5.4.42) not satisfy requirement. done. apparently, zend framework only needs php 5.3+ contradicts above. need use php 5.4. my composer.json following: { "name": "
Read more

c# - Better 64-bit byte array hash -

-
i need hash algorithm produces 64-bit hash code ( long ) fewer collisions string.gethashcode() , fast (no expensive calls cryptographic functions). here's implementation of fnv still shows 3% of collisions after testing 2 million random strings. need number way lower. void main() { const string chars = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz!#@$%^&*()_+}{\":?><,./;'[]0123456789\\"; const int n = 2000000; var random = new random(); var hashes = new hashset<long>(); int collisions = 0; for(int = 0; < n; i++) { var len = random.next(chars.length); var str = new char[len]; (int j = 0; j < len; j++) { str[j] = chars[random.next(chars.length)]; } var s = new string(str); if(!hashes.add(get64bithash( s ))) collisions++; } console.writeline("collision percentage after " + n + " random strings: " + ((doubl
Read more

python - PyCharm Type error Message -

-
i'm newbie trying out ml/dbn in python (3.4) under pycharm (comm.ed 4.5). following definition def make_thetas(xmin,xmax,n): xs = np.linespace(xmin,xmax,n) widths = (xs[1:] - xs[:-1])/2.0 thetas = xs[:-1] + widths return thetas throws error "class 'tuple' not define ' sub ', '-' operator cannot used on instance" on - operator on third line (widths = ....) ideas on how code running under pycharm - works alright in interactive python window. thx. to all, after g'g lot have found workaround seems work within pycharm. workaround because (even python newbie) expected python not need explicit typecasting, not when using datatypes imported lib such numpy. def make_thetas(xmin,xmax,n): xs = np.array(np.linspace(xmin,xmax,n)) widths = (xs[1:] - xs[:-1])/2.0 thetas = xs[:-1]+ widths return thetas using docstrings type-hinting such below did not work def make_thetas(xmin,xmax,n): "&q
Read more