issue in deleting a layout and setting a new layout..

[sathyanarayanan.se]

hi i am trying to delete the old layout and then set the other layout... i used delete layout before setting the new layout... this sets the new layout on top of the old layout and both are visible... is there any function for clearing the screen before setting another layout?

[divanov]

Call widget->update();

[sathyanarayanan.se]

this also doesnot solve my problem...
i am posting a sample code... hope it will help ..
first i am adding a widget to the QGridlayout layout using the following lines.

layout->addWidget(treeWidget,0,0);
setLayout(layout);

then removing that widget and updating and deleting the gridlayout.

layout->removeWidget(treeWidget);
layout->update();
delete layout;

here i am trying to set the new gridlayout on screen

layout1->addWidget(checkbox,j,0);
setLayout(layout1);

if i do like this the layout recently set appears over the old one...

[divanov]

Did you consider possibility to re-use layout?

layout->addWidget(treeWidget,0,0);
setLayout(layout);
// do something
layout->removeWidget(treeWidget);
layout->addWidget(checkbox,j,0);

[sathyanarayanan.se]

yeah ... but that also didnot work as expected..

[divanov]

yeah ... but that also didnot work as expected..

This must work as expected unless there is something else in your code.

[sathyanarayanan.se]

i dont find any problem with my code... ok do u mean that reusing the layout is the only option and creating another layout and setting it cannot be done?

[divanov]

i dont find any problem with my code... ok do u mean that reusing the layout is the only option and creating another layout and setting it cannot be done?

If you don't find problems it doesn't mean they are absent. You can measure performance to see that re-using is actually faster.

[achipa]

i dont find any problem with my code... ok do u mean that reusing the layout is the only option and creating another layout and setting it cannot be done?

If you are operating with two layouts, you will need to synchronize their relation/appearance yourself, while if you are reusing one layout, it's both faster and avoids the need for strategically placed calls to update, processEvents, show and similar. If your layout break because of this, then you are not cleaning things up properly (in plain English: you are solving a problem by introducing a different one )