- Extending Qt Creator Manual
- ILocatorFilter
- Extending Qt Creator Manual 6.0.2

# ILocatorFilter Class

class Core::ILocatorFilter

The ILocatorFilter class adds a locator filter. More...

Header: | #include <coreplugin/locator/ilocatorfilter.h>
Inherited By: | Core::BaseFileFilter

- List of all members, including inherited members

## Public Types

enum class | MatchLevel { Best, Better, Good, Normal, Count }
enum | Priority { Highest, High, Medium, Low }

## Public Functions

| ILocatorFilter(QObject *parent = nullptr)
virtual void | accept(Core::LocatorFilterEntry selection, QString *newText, int *selectionStart, int *selectionLength) const = 0
Utils::Id | actionId() const
QString | description() const
QString | displayName() const
Utils::Id | id() const
bool | isConfigurable() const
bool | isEnabled() const
bool | isHidden() const
bool | isIncludedByDefault() const
virtual QList<Core::LocatorFilterEntry> | matchesFor(QFutureInterface<Core::LocatorFilterEntry> &future, const QString &entry) = 0
virtual bool | openConfigDialog(QWidget *parent, bool &needsRefresh)
virtual void | prepareSearch(const QString &entry)
Core::ILocatorFilter::Priority | priority() const
virtual void | refresh(QFutureInterface<void> &future)
virtual void | restoreState(const QByteArray &state)
virtual QByteArray | saveState() const
void | setDefaultIncludedByDefault(bool includedByDefault)
void | setDefaultShortcutString(const QString &shortcut)
void | setDescription(const QString &description)
void | setDisplayName(const QString &displayString)
void | setIncludedByDefault(bool includedByDefault)
void | setShortcutString(const QString &shortcut)
QString | shortcutString() const

## Public Slots

void | setEnabled(bool enabled)

## Static Public Members

const QList<Core::ILocatorFilter *> | allLocatorFilters()
Qt::CaseSensitivity | caseSensitivity(const QString &str)
QRegularExpression | createRegExp(const QString &text, Qt::CaseSensitivity caseSensitivity = Qt::CaseInsensitive)
LocatorFilterEntry::HighlightInfo | highlightInfo(const QRegularExpressionMatch &match, LocatorFilterEntry::HighlightInfo::DataType dataType = LocatorFilterEntry::HighlightInfo::DisplayName)
QString | msgConfigureDialogTitle()
QString | msgIncludeByDefault()
QString | msgIncludeByDefaultToolTip()
QString | msgPrefixLabel()
QString | msgPrefixToolTip()

## Protected Functions

bool | openConfigDialog(QWidget *parent, QWidget *additionalWidget)
virtual void | restoreState(const QJsonObject &object)
virtual void | saveState(QJsonObject &object) const
void | setConfigurable(bool configurable)
void | setHidden(bool hidden)
void | setId(Utils::Id id)
void | setPriority(Core::ILocatorFilter::Priority priority)

## Static Protected Members

bool | isOldSetting(const QByteArray &state)

## Detailed Description

The filter is added to Tools > Locate.

## Member Type Documentation

### enum class ILocatorFilter::MatchLevel

This enum value holds the level for ordering the results based on how well they match the search criteria.

Constant | Value | Description
--- | --- | ---
`Core::ILocatorFilter::MatchLevel::Best` | `0` | The result is the best match for the regular expression.
`Core::ILocatorFilter::MatchLevel::Better` | `1` |
`Core::ILocatorFilter::MatchLevel::Good` | `2` |
`Core::ILocatorFilter::MatchLevel::Normal` | `3` |
`Core::ILocatorFilter::MatchLevel::Count` | `4` | The result has the highest number of matches for the regular expression.

### enum ILocatorFilter::Priority

This enum value holds the priority that is used for ordering the results when multiple filters are used.

Constant | Value | Description
--- | --- | ---
`Core::ILocatorFilter::Highest` | `0` | The results for this filter are placed above the results for filters that have other priorities.
`Core::ILocatorFilter::High` | `1` |
`Core::ILocatorFilter::Medium` | `2` | The default value.
`Core::ILocatorFilter::Low` | `3` | The results for this filter are placed below the results for filters that have other priorities.

## Member Function Documentation

### ILocatorFilter::ILocatorFilter(QObject *parent = nullptr)

Constructs a locator filter with parent. Call from subclasses.

### `[slot]` void ILocatorFilter::setEnabled(bool enabled)

Sets whether the filter is currently available to enabled.

See also isEnabled().

### `[pure virtual]` void ILocatorFilter::accept(Core::LocatorFilterEntry selection, QString *newText, int *selectionStart, int *selectionLength) const

Called with the entry specified by selection when the user activates it in the result list. Implementations can return a new search term newText, which has selectionLength characters starting from selectionStart preselected, and the cursor set to the end of the selection.

### Utils::Id ILocatorFilter::actionId() const

Returns the filter's action ID.

### `[static]` const QList<Core::ILocatorFilter *> ILocatorFilter::allLocatorFilters()

Returns the list of all locator filters.

### `[static]` Qt::CaseSensitivity ILocatorFilter::caseSensitivity(const QString &str)

Returns whether a case sensitive or case insensitive search should be performed for the search term str.

### `[static]` QRegularExpression ILocatorFilter::createRegExp(const QString &text, Qt::CaseSensitivity caseSensitivity = Qt::CaseInsensitive)

Creates the search term text as a regular expression with case sensitivity set to caseSensitivity.

### QString ILocatorFilter::description() const

Returns a longer, human-readable description of what the filter does.

See also setDescription().

### QString ILocatorFilter::displayName() const

Returns the filter's translated display name.

See also setDisplayName().

### `[static]` LocatorFilterEntry::HighlightInfo ILocatorFilter::highlightInfo(const QRegularExpressionMatch &match, LocatorFilterEntry::HighlightInfo::DataType dataType = LocatorFilterEntry::HighlightInfo::DisplayName)

Returns information for highlighting the results of matching the regular expression, specified by match, for the data of the type dataType.

### Utils::Id ILocatorFilter::id() const

Returns the filter's unique ID.

See also setId().

### bool ILocatorFilter::isConfigurable() const

Returns whether a configuration dialog is available for this filter.

The default is `true`.

See also setConfigurable().

### bool ILocatorFilter::isEnabled() const

Returns whether the filter is currently available. Disabled filters are neither visible in menus nor included in searches, even when the search is prefixed with their shortcut string.

The default is `true`.

See also setEnabled().

### bool ILocatorFilter::isHidden() const

Returns whether the filter should be hidden in the Locator filters filter, menus, and locator settings.

The default is `false`.

See also setHidden().

### bool ILocatorFilter::isIncludedByDefault() const

Returns whether using the shortcut string is required to use this filter. The default is `false`.

See also shortcutString() and setIncludedByDefault().

### `[static protected]` bool ILocatorFilter::isOldSetting(const QByteArray &state)

Returns if state must be restored via pre-4.15 settings reading.

### `[pure virtual]` QList<Core::LocatorFilterEntry> ILocatorFilter::matchesFor(QFutureInterface<Core::LocatorFilterEntry> &future, const QString &entry)

Returns the list of results of this filter for the search term entry. This is run in a separate thread, but is guaranteed to only run in a single thread at any given time. Quickly running preparations can be done in the GUI thread in prepareSearch().

Implementations should do a case sensitive or case insensitive search depending on caseSensitivity(). If future is `canceled`, the search should be aborted.

See also prepareSearch() and caseSensitivity().

### `[static]` QString ILocatorFilter::msgConfigureDialogTitle()

Specifies a title for configuration dialogs.

### `[static]` QString ILocatorFilter::msgIncludeByDefault()

Specifies a label for the include by default input field in configuration dialogs.

### `[static]` QString ILocatorFilter::msgIncludeByDefaultToolTip()

Specifies a tooltip for the include by default input field in configuration dialogs.

### `[static]` QString ILocatorFilter::msgPrefixLabel()

Specifies a label for the prefix input field in configuration dialogs.

### `[static]` QString ILocatorFilter::msgPrefixToolTip()

Specifies a tooltip for the prefix input field in configuration dialogs.

### `[virtual]` bool ILocatorFilter::openConfigDialog(QWidget *parent, bool &needsRefresh)

Opens a dialog for the parent widget that allows the user to configure various aspects of the filter. Called when the user requests to configure the filter.

Set needsRefresh to `true`, if a refresh() should be done after closing the dialog. Return `false` if the user canceled the dialog.

The default implementation allows changing the shortcut and whether the filter is included by default.

See also refresh().

### `[protected]` bool ILocatorFilter::openConfigDialog(QWidget *parent, QWidget *additionalWidget)

Shows the standard configuration dialog with options for the prefix string and for isIncludedByDefault(). The additionalWidget is added at the top. Ownership of additionalWidget stays with the caller, but its parent is reset to `nullptr`.

Returns `false` if the user canceled the dialog.

### `[virtual]` void ILocatorFilter::prepareSearch(const QString &entry)

Performs actions that need to be done in the main thread before actually running the search for entry.

Called on the main thread before matchesFor() is called in a separate thread.

The default implementation does nothing.

See also matchesFor().

### Core::ILocatorFilter::Priority ILocatorFilter::priority() const

Returns the priority that is used for ordering the results when multiple filters are used.

The default is ILocatorFilter::Medium.

See also setPriority().

### `[virtual]` void ILocatorFilter::refresh(QFutureInterface<void> &future)

Refreshes cached data asynchronously.

If future is `canceled`, the refresh should be aborted.

### `[virtual]` void ILocatorFilter::restoreState(const QByteArray &state)

Restores the state of the filter from data previously created by saveState().

See also saveState().

### `[virtual protected]` void ILocatorFilter::restoreState(const QJsonObject &object)

Reads the filter settings and state from the JSON object

The default implementation does nothing.

Implementations should read their custom settings from the object, resetting any missing setting to its default value.

### `[virtual]` QByteArray ILocatorFilter::saveState() const

Returns data that can be used to restore the settings for this filter (for example at startup). By default, adds the base settings (shortcut string, included by default) and calls saveState() with a JSON object where subclasses should write their custom settings.

See also restoreState().

### `[virtual protected]` void ILocatorFilter::saveState(QJsonObject &object) const

Saves the filter settings and state to the JSON object.

The default implementation does nothing.

Implementations should write key-value pairs to the object for their custom settings that changed from the default. Default values should never be saved.

### `[protected]` void ILocatorFilter::setConfigurable(bool configurable)

Sets whether the filter provides a configuration dialog to configurable. Most filters should at least provide the default dialog.

See also isConfigurable().

### void ILocatorFilter::setDefaultIncludedByDefault(bool includedByDefault)

Sets the default setting for whether using the shortcut string is required to use this filter to includedByDefault.

Call for example from the constructor of subclasses.

See also isIncludedByDefault().

### void ILocatorFilter::setDefaultShortcutString(const QString &shortcut)

Sets the default shortcut string that can be used to explicitly choose this filter in the locator input field. Call for example from the constructor of subclasses.

See also shortcutString().

### void ILocatorFilter::setDescription(const QString &description)

Sets the longer, human-readable description of what the filter does.

See also description().

### void ILocatorFilter::setDisplayName(const QString &displayString)

Sets the translated display name of this filter to displayString.

Subclasses must set the display name in their constructor.

See also displayName().

### `[protected]` void ILocatorFilter::setHidden(bool hidden)

Sets the filter in the Locator filters filter, menus, and locator settings to hidden. Call in the constructor of subclasses.

See also isHidden().

### `[protected]` void ILocatorFilter::setId(Utils::Id id)

Sets the filter's unique id. Subclasses must set the ID in their constructor.

See also id().

### void ILocatorFilter::setIncludedByDefault(bool includedByDefault)

Sets whether using the shortcut string is required to use this filter to includedByDefault. Use setDefaultIncludedByDefault() if you want to set the default value instead.

See also isIncludedByDefault() and setDefaultIncludedByDefault().

### `[protected]` void ILocatorFilter::setPriority(Core::ILocatorFilter::Priority priority)

Sets the priority of results of this filter in the result list.

See also priority().

### void ILocatorFilter::setShortcutString(const QString &shortcut)

Sets the current shortcut string of the filter to shortcut. Use setDefaultShortcutString() if you want to set the default shortcut string instead.

See also shortcutString() and setDefaultShortcutString().

### QString ILocatorFilter::shortcutString() const

Specifies a shortcut string that can be used to explicitly choose this filter in the locator input field by preceding the search term with the shortcut string and a whitespace.

The default value is an empty string.

See also setShortcutString().