QGIS API Documentation  3.20.0-Odense (decaadbb31)
qgslocatormodelbridge.cpp
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1 /***************************************************************************
2  qgslocatormodelbridge.cpp
3  ------------------
4  begin : November 2018
5  copyright : (C) 2018 by Denis Rouzaud
6  email : [email protected]
7  ***************************************************************************/
8 
9 /***************************************************************************
10  * *
11  * This program is free software; you can redistribute it and/or modify *
12  * it under the terms of the GNU General Public License as published by *
13  * the Free Software Foundation; either version 2 of the License, or *
14  * (at your option) any later version. *
15  * *
16  ***************************************************************************/
17 
18 #include "qgslocatormodelbridge.h"
19 #include "qgslocator.h"
20 #include "qgslocatormodel.h"
21 
22 
24  : QObject( parent )
25  , mLocator( new QgsLocator( this ) )
26  , mLocatorModel( new QgsLocatorModel( this ) )
27 {
28  mProxyModel = new QgsLocatorProxyModel( mLocatorModel );
29  mProxyModel->setSourceModel( mLocatorModel );
30 
31  connect( mLocator, &QgsLocator::foundResult, this, &QgsLocatorModelBridge::addResult );
32  connect( mLocator, &QgsLocator::finished, this, &QgsLocatorModelBridge::searchFinished );
33 }
34 
36 {
37  return mIsRunning;
38 }
39 
40 void QgsLocatorModelBridge::triggerResult( const QModelIndex &index, const int actionId )
41 {
42  mLocator->clearPreviousResults();
43  QgsLocatorResult result = mProxyModel->data( index, QgsLocatorModel::ResultDataRole ).value< QgsLocatorResult >();
44  if ( result.filter )
45  {
46  if ( actionId >= 0 )
47  result.filter->triggerResultFromAction( result, actionId );
48  else
49  result.filter->triggerResult( result );
50  }
51 }
52 
53 void QgsLocatorModelBridge::setIsRunning( bool isRunning )
54 {
55  if ( mIsRunning == isRunning )
56  return;
57 
58  mIsRunning = isRunning;
59  emit isRunningChanged();
60 }
61 
63 {
64  mLocator->cancelWithoutBlocking();
65  mLocatorModel->clear();
66 }
67 
69 {
70  mCanvasExtent = extent;
71 }
72 
74 {
75  mCanvasCrs = crs;
76 }
77 
78 void QgsLocatorModelBridge::addResult( const QgsLocatorResult &result )
79 {
80  mLocatorModel->addResult( result );
81  emit resultAdded();
82 }
83 
84 
85 void QgsLocatorModelBridge::searchFinished()
86 {
87  if ( mHasQueuedRequest )
88  {
89  // a queued request was waiting for this - run the queued search now
90  QString nextSearch = mNextRequestedString;
91  mNextRequestedString.clear();
92  mHasQueuedRequest = false;
93  performSearch( nextSearch );
94  }
95  else
96  {
97  if ( !mLocator->isRunning() )
98  setIsRunning( false );
99  }
100 }
101 
102 void QgsLocatorModelBridge::performSearch( const QString &text )
103 {
104  setIsRunning( true );
105 
106  if ( mLocator->isRunning() )
107  {
108  // can't do anything while a query is running, and can't block
109  // here waiting for the current query to cancel
110  // so we queue up this string until cancel has happened
111  mLocator->cancelWithoutBlocking();
112  mNextRequestedString = text;
113  mHasQueuedRequest = true;
114  return;
115  }
116  else
117  {
118  emit resultsCleared();
119  mLocatorModel->deferredClear();
120  mLocator->fetchResults( text, createContext() );
121  }
122 }
123 
125 {
126  return mLocator;
127 }
128 
130 {
131  return mProxyModel;
132 }
133 
135 {
136  return mHasQueuedRequest;
137 }
138 
139 QgsLocatorContext QgsLocatorModelBridge::createContext()
140 {
141  QgsLocatorContext context;
142  context.targetExtent = mCanvasExtent;
143  context.targetExtentCrs = mCanvasCrs;
144  context.transformContext = mTransformContext;
145  return context;
146 }
This class represents a coordinate reference system (CRS).
Encapsulates the properties relating to the context of a locator search.
QgsCoordinateTransformContext transformContext
Coordinate transform context, to use whenever performing coordinate transformations inside a locator.
QgsCoordinateReferenceSystem targetExtentCrs
Coordinate reference system for the map extent variable.
QgsRectangle targetExtent
Map extent to target in results.
virtual void triggerResultFromAction(const QgsLocatorResult &result, const int actionId)
Triggers a filter result from this filter for an entry in the context menu.
virtual void triggerResult(const QgsLocatorResult &result)=0
Triggers a filter result from this filter.
QgsLocatorModelBridge(QObject *parent=nullptr)
Constructor of QgsLocatorModelBridge.
Q_INVOKABLE QgsLocatorProxyModel * proxyModel() const
Returns the proxy model.
void isRunningChanged()
Emitted when the running status changes.
void resultAdded()
Emitted when a result is added.
void triggerResult(const QModelIndex &index, const int actionId=-1)
Triggers the result at given index and with optional actionId if an additional action was triggered.
QgsLocator * locator() const
Returns the locator.
bool hasQueueRequested() const
Returns true if some text to be search is pending in the queue.
Q_INVOKABLE void performSearch(const QString &text)
Perform a search.
void resultsCleared()
Emitted when the results are cleared.
void updateCanvasCrs(const QgsCoordinateReferenceSystem &crs)
Update the canvas CRS used to create search context.
void updateCanvasExtent(const QgsRectangle &extent)
Update the canvas extent used to create search context.
void invalidateResults()
This will invalidate current search results.
An abstract list model for displaying the results of locator searches.
void deferredClear()
Resets the model and clears all existing results after a short delay, or whenever the next result is ...
void addResult(const QgsLocatorResult &result)
Adds a new result to the model.
void clear()
Resets the model and clears all existing results.
@ ResultDataRole
QgsLocatorResult data.
A sort proxy model for QgsLocatorModel, which automatically sorts results by precedence.
Encapsulates properties of an individual matching result found by a QgsLocatorFilter.
QgsLocatorFilter * filter
Filter from which the result was obtained.
Handles the management of QgsLocatorFilter objects and async collection of search results from them.
Definition: qgslocator.h:59
void finished()
Emitted when locator has finished a query, either as a result of successful completion or early cance...
void foundResult(const QgsLocatorResult &result)
Emitted whenever a filter encounters a matching result after the fetchResults() method is called.
void fetchResults(const QString &string, const QgsLocatorContext &context, QgsFeedback *feedback=nullptr)
Triggers the background fetching of filter results for a specified search string.
Definition: qgslocator.cpp:129
void clearPreviousResults()
Will call clearPreviousResults on all filters.
Definition: qgslocator.cpp:266
bool isRunning() const
Returns true if a query is currently being executed by the locator.
Definition: qgslocator.cpp:261
void cancelWithoutBlocking()
Triggers cancellation of any current running query without blocking.
Definition: qgslocator.cpp:255
A rectangle specified with double values.
Definition: qgsrectangle.h:42
const QgsCoordinateReferenceSystem & crs