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Code Issues Releases Wiki Activity

Fixed bug, wrong menu position.

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This commit is contained in:
stonegate 2020-08-02 23:29:13 +08:00
parent da4a31a81e
commit fe63491c55
1 changed files with 17 additions and 6 deletions
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23
lib/util/custom_dropdown.dart
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@ -463,10 +463,17 @@ class _DropdownRoute<T> extends PopupRoute<_DropdownRouteResult<T>> {
var offset = kMaterialListPadding.top;
if (items.isNotEmpty && index > 0) {
assert(items.length == itemHeights?.length);
offset += itemHeights
.sublist(0, index)
.reduce((total, height) => total + height);
if (displayItemCount == null) {
offset += itemHeights
.sublist(0, index)
.reduce((total, height) => total + height);
} else {
offset += itemHeights
.sublist(math.max(0, index + 1 - displayItemCount), index)
.reduce((total, height) => total + height);
}
}
return offset;
}
@ -476,7 +483,10 @@ class _DropdownRoute<T> extends PopupRoute<_DropdownRouteResult<T>> {
// that's possible given availableHeight.
_MenuLimits getMenuLimits(
Rect buttonRect, double availableHeight, int index) {
final maxMenuHeight = availableHeight - 2.0 * _kMenuItemHeight;
final maxMenuHeight = displayItemCount == null
? availableHeight - 2.0 * _kMenuItemHeight
: math.min(_kMenuItemHeight * displayItemCount,
availableHeight - 2 * _kMenuItemHeight);
final buttonTop = buttonRect.top;
final buttonBottom = math.min(buttonRect.bottom, availableHeight);
final selectedItemOffset = getItemOffset(index);
@ -522,8 +532,9 @@ class _DropdownRoute<T> extends PopupRoute<_DropdownRouteResult<T>> {
// (the default).
final scrollOffset = preferredMenuHeight <= maxMenuHeight
? 0.0
: math.max(0.0, selectedItemOffset - (buttonTop - menuTop));
: displayItemCount == null || displayItemCount > index
? math.max(0.0, selectedItemOffset - (buttonTop - menuTop))
: math.max(0.0, (index - displayItemCount + 1) * _kMenuItemHeight);
return _MenuLimits(menuTop, menuBottom, menuHeight, scrollOffset);
}
}