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1 | #ifndef SCIQLOP_DATASOURCETREEWIDGETHELPER_H | |
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2 | #define SCIQLOP_DATASOURCETREEWIDGETHELPER_H | |
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3 | ||
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4 | #include <functional> | |
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5 | ||
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6 | class DataSourceTreeWidgetItem; | |
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7 | class QTreeWidget; | |
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8 | ||
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9 | class DataSourceTreeWidgetHelper { | |
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10 | public: | |
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11 | /// Signature of the function associated to the filtering action | |
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12 | using FilterFunction = std::function<bool(const DataSourceTreeWidgetItem &dataSourceItem)>; | |
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13 | ||
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14 | /** | |
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15 | * Filters a tree widget according to a function. If an item is valid according to this | |
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16 | * function, all of its ancestors and children are shown | |
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17 | * @param treeWidget the widget to filter | |
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18 | * @param fun the filter function | |
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19 | */ | |
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20 | static void filter(QTreeWidget &treeWidget, FilterFunction fun) noexcept; | |
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21 | }; | |
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22 | ||
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23 | #endif // SCIQLOP_DATASOURCETREEWIDGETHELPER_H | |
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1 | #include "DataSource/DataSourceTreeWidgetHelper.h" | |
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2 | #include "DataSource/DataSourceTreeWidgetItem.h" | |
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3 | ||
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4 | namespace { | |
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5 | ||
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6 | bool filterTreeItem(DataSourceTreeWidgetItem &treeItem, | |
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7 | DataSourceTreeWidgetHelper::FilterFunction fun, bool parentValid = false) | |
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8 | { | |
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9 | auto selfValid = parentValid || fun(treeItem); | |
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10 | ||
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11 | auto childValid = false; | |
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12 | auto childCount = treeItem.childCount(); | |
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13 | for (auto i = 0; i < childCount; ++i) { | |
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14 | if (auto childItem = dynamic_cast<DataSourceTreeWidgetItem *>(treeItem.child(i))) { | |
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15 | childValid |= filterTreeItem(*childItem, fun, selfValid); | |
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16 | } | |
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17 | } | |
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18 | ||
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19 | auto valid = selfValid || childValid; | |
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20 | ||
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21 | treeItem.setHidden(!valid); | |
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22 | ||
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23 | return valid; | |
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24 | } | |
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25 | ||
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26 | } // namespace | |
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27 | ||
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28 | void DataSourceTreeWidgetHelper::filter(QTreeWidget &treeWidget, FilterFunction fun) noexcept | |
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29 | { | |
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30 | auto itemCount = treeWidget.topLevelItemCount(); | |
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31 | for (auto i = 0; i < itemCount; ++i) { | |
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32 | if (auto item = dynamic_cast<DataSourceTreeWidgetItem *>(treeWidget.topLevelItem(i))) { | |
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33 | filterTreeItem(*item, fun); | |
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34 | } | |
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35 | } | |
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36 | } | |
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