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fix a division by zero of scrollbar

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This commit is contained in:
Jinhao 2015-09-30 17:03:49 +08:00
parent 3e4455fb18
commit 6ca50a7cb4
1 changed files with 5 additions and 1 deletions
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6
source/gui/widgets/scroll.cpp
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@ -90,7 +90,11 @@ namespace nana
metrics_.scroll_pos = pos; metrics_.scroll_pos = pos;
auto value_max = metrics_.peak - metrics_.range; auto value_max = metrics_.peak - metrics_.range;
metrics_.value = pos * value_max / scroll_area;
//Check scroll_area to avoiding division by zero.
if (scroll_area)
metrics_.value = pos * value_max / scroll_area;
if(metrics_.value < value_max) if(metrics_.value < value_max)
{ {
int selfpos = static_cast<int>(metrics_.value * scroll_area / value_max); int selfpos = static_cast<int>(metrics_.value * scroll_area / value_max);