QGIS API Documentation  2.99.0-Master (c42dad3)
qgsscalerangewidget.cpp
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1 /***************************************************************************
2  qgsscalerangewidget.cpp
3  --------------------------------------
4  Date : 25.04.2014
5  Copyright : (C) 2014 Denis Rouzaud
6  Email : [email protected]
7 ***************************************************************************
8 * *
9 * This program is free software; you can redistribute it and/or modify *
10 * it under the terms of the GNU General Public License as published by *
11 * the Free Software Foundation; either version 2 of the License, or *
12 * (at your option) any later version. *
13 * *
14 ***************************************************************************/
15 
16 #include "qgsscalerangewidget.h"
17 #include "qgsapplication.h"
18 #include "qgsproject.h"
19 #include "qgsscalewidget.h"
20 
22  : QWidget( parent )
23  , mCanvas( nullptr )
24 {
25  mLayout = new QGridLayout( this );
26  mLayout->setContentsMargins( 0, 0, 0, 0 );
27 
28  QLabel* minLbl = new QLabel( tr( "Minimum (exclusive)" ), this );
29  minLbl->setWordWrap( true );
30  minLbl->setAlignment( Qt::AlignTop );
31  minLbl->setToolTip( tr( "Minimum scale, i.e. maximum scale denominator. "
32  "This limit is exclusive, that means the layer will not be displayed on this scale." ) );
33  QLabel* maxLbl = new QLabel( tr( "Maximum (inclusive)" ), this );
34  maxLbl->setWordWrap( true );
35  maxLbl->setAlignment( Qt::AlignTop );
36  maxLbl->setToolTip( tr( "Maximum scale, i.e. minimum scale denominator. "
37  "This limit is inclusive, that means the layer will be displayed on this scale." ) );
38 
39  mMinimumScaleIconLabel = new QLabel( this );
40  mMinimumScaleIconLabel->setPixmap( QgsApplication::getThemePixmap( QStringLiteral( "/mActionZoomOut.svg" ) ) );
41  mMaximumScaleIconLabel = new QLabel( this );
42  mMaximumScaleIconLabel->setPixmap( QgsApplication::getThemePixmap( QStringLiteral( "/mActionZoomIn.svg" ) ) );
43 
44  mMinimumScaleWidget = new QgsScaleWidget( this );
45  mMaximumScaleWidget = new QgsScaleWidget( this );
46  connect( mMinimumScaleWidget, SIGNAL( scaleChanged( double ) ), mMaximumScaleWidget, SLOT( setMinScale( double ) ) );
47  mMinimumScaleWidget->setShowCurrentScaleButton( true );
48  mMaximumScaleWidget->setShowCurrentScaleButton( true );
50  // add start, add comprehension of scales by settings fake ordered values
51  mMinimumScaleWidget->setScale( 1.0 / 100000 );
52  mMaximumScaleWidget->setScale( 1.0 / 1000 );
53 
54  mLayout->addWidget( minLbl, 0, 0, 1, 2 );
55  mLayout->addWidget( mMinimumScaleIconLabel, 1, 0 );
56  mLayout->addWidget( mMinimumScaleWidget, 1, 1 );
57  mLayout->addWidget( maxLbl, 0, 2, 1, 2 );
58  mLayout->addWidget( mMaximumScaleIconLabel, 1, 2 );
59  mLayout->addWidget( mMaximumScaleWidget, 1, 3 );
60 
61  mLayout->setColumnStretch( 0, 0 );
62  mLayout->setColumnStretch( 1, 3 );
63  mLayout->setColumnStretch( 2, 0 );
64  mLayout->setColumnStretch( 3, 3 );
65 
66  connect( mMinimumScaleWidget, SIGNAL( scaleChanged( double ) ), this, SLOT( emitRangeChanged() ) );
67  connect( mMaximumScaleWidget, SIGNAL( scaleChanged( double ) ), this, SLOT( emitRangeChanged() ) );
68 }
69 
71 {
72 }
73 
75 {
76  bool projectScales = QgsProject::instance()->readBoolEntry( QStringLiteral( "Scales" ), QStringLiteral( "/useProjectScales" ) );
77  if ( projectScales )
78  {
79  QStringList scalesList = QgsProject::instance()->readListEntry( QStringLiteral( "Scales" ), QStringLiteral( "/ScalesList" ) );
80  mMinimumScaleWidget->updateScales( scalesList );
81  mMaximumScaleWidget->updateScales( scalesList );
82  }
83 }
84 
86 {
87  mMinimumScaleWidget->setMapCanvas( mapCanvas );
88  mMaximumScaleWidget->setMapCanvas( mapCanvas );
89 }
90 
92 {
93  if ( qIsInf( scale ) )
94  scale = 0;
95  mMinimumScaleWidget->setScale( scale );
96 }
97 
99 {
100  return mMinimumScaleWidget->scale();
101 }
102 
104 {
105  if ( qIsInf( scale ) )
106  scale = 0;
107  mMaximumScaleWidget->setScale( scale );
108 }
109 
111 {
112  return mMaximumScaleWidget->scale();
113 }
114 
116 {
117  double scale = maximumScale();
118  if ( scale == 0 )
119  return 0;
120  else
121  return qRound( 1.0 / scale );
122 }
123 
125 {
126  double scale = minimumScale();
127  if ( scale == 0 )
128  return 0;
129  else
130  return qRound( 1.0 / scale );
131 }
132 
134 {
135  setMaximumScale( max );
136  setMinimumScale( min );
137 }
138 
139 void QgsScaleRangeWidget::emitRangeChanged()
140 {
142 }
143 
double minimumScale()
return the minimum scale
bool readBoolEntry(const QString &scope, const QString &key, bool def=false, bool *ok=nullptr) const
QgsScaleRangeWidget(QWidget *parent=nullptr)
A combobox which lets the user select map scale from predefined list and highlights nearest to curren...
void setMaximumScale(double scale)
Set the maximum scale.
void setScale(double scale)
Function to set the selected scale from double.
double minimumScaleDenom()
Returns the minimum scale denominator ( = 1 / maximum scale ) In case of maximum scale = 0 it will al...
static QPixmap getThemePixmap(const QString &theName)
Helper to get a theme icon as a pixmap.
Map canvas is a class for displaying all GIS data types on a canvas.
Definition: qgsmapcanvas.h:106
void reloadProjectScales()
call to reload the project scales and apply them to the 2 scales combo boxes
void setShowCurrentScaleButton(bool showCurrentScaleButton)
shows a button to set the scale to the current scale of the map canvas next to the combobox ...
double maximumScaleDenom()
Returns the maximum scale denominator ( = 1 / minimum scale ) In case of minimum scale = 0 it will al...
void updateScales(const QStringList &scales=QStringList())
double maximumScale()
return the maximum scale
QStringList readListEntry(const QString &scope, const QString &key, const QStringList &def=QStringList(), bool *ok=nullptr) const
Key value accessors.
void setMinimumScale(double scale)
Set the minimum scale.
double ANALYSIS_EXPORT min(double x, double y)
Returns the minimum of two doubles or the first argument if both are equal.
Definition: MathUtils.cc:452
double ANALYSIS_EXPORT max(double x, double y)
Returns the maximum of two doubles or the first argument if both are equal.
Definition: MathUtils.cc:437
void setScaleRange(double min, double max)
static QgsProject * instance()
Returns the QgsProject singleton instance.
Definition: qgsproject.cpp:348
void setMapCanvas(QgsMapCanvas *canvas)
set the map canvas associated to the current button
void setMapCanvas(QgsMapCanvas *mapCanvas)
set the map canvas which will be used for the current scale buttons
void rangeChanged(double min, double max)
Emitted when the scale range set in the widget is changed.