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Fix significant project load regressions when multiple layout legends…
… are present
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| diff --git a/src/core/layout/qgslayoutitemlegend.cpp b/src/core/layout/qgslayoutitemlegend.cpp | ||
| index b2223d74d5d..07d3c2ebd60 100644 | ||
| --- a/src/core/layout/qgslayoutitemlegend.cpp | ||
| +++ b/src/core/layout/qgslayoutitemlegend.cpp | ||
| @@ -75,12 +75,8 @@ QgsLayoutItemLegend::QgsLayoutItemLegend( QgsLayout *layout ) | ||
| { | ||
| // NOTE -- we do NOT connect to ::refresh here, as we don't want to trigger the call to onAtlasFeature() which sets mFilterAskedForUpdate to true, | ||
| // causing an endless loop. | ||
| - | ||
| - // TODO -- the call to QgsLayoutItem::refresh() is probably NOT required! | ||
| - QgsLayoutItem::refresh(); | ||
| - | ||
| - // (this one is definitely required) | ||
| - clearLegendCachedData(); | ||
| + invalidateCache(); | ||
| + update(); | ||
| } ); | ||
| } | ||
|
|
||
| @@ -1047,25 +1043,10 @@ void QgsLayoutItemLegend::mapThemeChanged( const QString &theme ) | ||
| mThemeName = theme; | ||
|
|
||
| // map's theme has been changed, so make sure to update the legend here | ||
| - if ( mLegendFilterByMap ) | ||
| - { | ||
| - // legend is being filtered by map, so we need to re run the hit test too | ||
| - // as the style overrides may also have affected the visible symbols | ||
| - updateFilterByMap( false ); | ||
| - } | ||
| - else | ||
| - { | ||
| - if ( mThemeName.isEmpty() ) | ||
| - { | ||
| - setModelStyleOverrides( QMap<QString, QString>() ); | ||
| - } | ||
| - else | ||
| - { | ||
| - // get style overrides for theme | ||
| - const QMap<QString, QString> overrides = mLayout->project()->mapThemeCollection()->mapThemeStyleOverrides( mThemeName ); | ||
| - setModelStyleOverrides( overrides ); | ||
| - } | ||
| - } | ||
| + | ||
| + // legend is being filtered by map, so we need to re run the hit test too | ||
| + // as the style overrides may also have affected the visible symbols | ||
| + updateFilterByMap( false ); | ||
|
|
||
| adjustBoxSize(); | ||
|
|
||
| @@ -1085,22 +1066,28 @@ void QgsLayoutItemLegend::updateFilterByMap( bool redraw ) | ||
|
|
||
| void QgsLayoutItemLegend::doUpdateFilterByMap() | ||
| { | ||
| - if ( mMap ) | ||
| + // There's an incompatibility here between legend handling of linked map themes and layer style overrides vs | ||
| + // how expression evaluation is made in legend content text. The logic below is hacked together to get | ||
| + // all the existing unit tests passing, but these two features are incompatible with each other and fixing | ||
| + // this is extremely non-trivial. Let's just hope no-one tries to use those features together! | ||
| + // Ideally, all the branches below would be consistently using either "setModelStyleOverrides" (which forces | ||
| + // a rebuild of each layer's legend, and breaks legend text expression evaluation) OR | ||
| + // "mLegendModel->setLayerStyleOverrides" which just handles the expression updates but which doesn't correctly | ||
| + // generate the legend content from the associated theme settings. | ||
| + if ( mMap && !mThemeName.isEmpty() ) | ||
| { | ||
| - if ( !mThemeName.isEmpty() ) | ||
| - { | ||
| - // get style overrides for theme | ||
| - const QMap<QString, QString> overrides = mLayout->project()->mapThemeCollection()->mapThemeStyleOverrides( mThemeName ); | ||
| - mLegendModel->setLayerStyleOverrides( overrides ); | ||
| - } | ||
| - else | ||
| - { | ||
| - mLegendModel->setLayerStyleOverrides( mMap->layerStyleOverrides() ); | ||
| - } | ||
| + // get style overrides for theme | ||
| + const QMap<QString, QString> overrides = mLayout->project()->mapThemeCollection()->mapThemeStyleOverrides( mThemeName ); | ||
| + setModelStyleOverrides( overrides ); | ||
| + } | ||
| + else if ( mMap ) | ||
| + { | ||
| + mLegendModel->setLayerStyleOverrides( mMap->layerStyleOverrides() ); | ||
| } | ||
| else | ||
| + { | ||
| mLegendModel->setLayerStyleOverrides( QMap<QString, QString>() ); | ||
| - | ||
| + } | ||
|
|
||
| const bool filterByExpression = QgsLayerTreeUtils::hasLegendFilterExpression( *( mCustomLayerTree ? mCustomLayerTree.get() : mLayout->project()->layerTreeRoot() ) ); | ||
|
|
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