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Evenly distribute stretched Nodes in BoxContainer

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Add any leftover fractional pixels to an error accumulator. When the
accumulator is greater or equal to one, add one pixel to the current
Node's size and subtract one from the accumulator.

Closes #36522

(cherry picked from commit 04ea6ec88d)
This commit is contained in:
Daniel Ting 2020-07-15 15:56:00 -05:00 committed by Rémi Verschelde
parent 400a780050
commit 6f71bc2a06
1 changed files with 9 additions and 2 deletions
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11
scene/gui/box_container.cpp
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@ -103,6 +103,7 @@ void BoxContainer::_resort() {
has_stretched = true;
bool refit_successful = true; //assume refit-test will go well
float error = 0; // Keep track of accumulated error in pixels
for (int i = 0; i < get_child_count(); i++) {
@ -117,8 +118,9 @@ void BoxContainer::_resort() {
if (msc.will_stretch) { //wants to stretch
//let's see if it can really stretch
int final_pixel_size = stretch_avail * c->get_stretch_ratio() / stretch_ratio_total;
float final_pixel_size = stretch_avail * c->get_stretch_ratio() / stretch_ratio_total;
// Add leftover fractional pixels to error accumulator
error += final_pixel_size - (int)final_pixel_size;
if (final_pixel_size < msc.min_size) {
//if available stretching area is too small for widget,
//then remove it from stretching area
@ -130,6 +132,11 @@ void BoxContainer::_resort() {
break;
} else {
msc.final_size = final_pixel_size;
// Dump accumulated error if one pixel or more
if (error >= 1) {
msc.final_size += 1;
error -= 1;
}
}
}
}