QGIS API Documentation 3.29.0-Master (da8bb1db43)
qgslayertreeembeddedwidgetsimpl.cpp
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1/***************************************************************************
2 qgslayertreeembeddedwidgetsimpl.h
3 --------------------------------------
4 Date : May 2016
5 Copyright : (C) 2016 by Martin Dobias
6 Email : wonder dot sk at gmail dot com
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
17
18#include <QFontMetrics>
19#include <QHBoxLayout>
20#include <QLabel>
21#include <QSlider>
22#include <QTimer>
23#include "qgsmaplayer.h"
24
26
27QgsLayerTreeOpacityWidget::QgsLayerTreeOpacityWidget( QgsMapLayer *layer )
28 : mLayer( layer )
29{
30 setAutoFillBackground( true ); // override the content from model
31 QLabel *l = new QLabel( tr( "Opacity" ), this );
32 mSlider = new QSlider( Qt::Horizontal, this );
33 mSlider->setRange( 0, 1000 );
34 const int sliderW = static_cast< int >( QFontMetricsF( font() ).horizontalAdvance( 'X' ) * 16 * Qgis::UI_SCALE_FACTOR );
35 mSlider->setMinimumWidth( sliderW / 2 );
36 mSlider->setMaximumWidth( sliderW );
37 QHBoxLayout *lay = new QHBoxLayout();
38 QSpacerItem *spacerItem = new QSpacerItem( 1, 0, QSizePolicy::MinimumExpanding, QSizePolicy::Minimum );
39 lay->addWidget( l );
40 lay->addWidget( mSlider );
41 lay->addItem( spacerItem );
42 setLayout( lay );
43
44 // timer for delayed transparency update - for more responsive GUI
45 mTimer = new QTimer( this );
46 mTimer->setSingleShot( true );
47 mTimer->setInterval( 100 );
48 connect( mTimer, &QTimer::timeout, this, &QgsLayerTreeOpacityWidget::updateOpacityFromSlider );
49
50 connect( mSlider, &QAbstractSlider::valueChanged, this, &QgsLayerTreeOpacityWidget::sliderValueChanged );
51
52 // init from layer
53 mSlider->setValue( mLayer->opacity() * 1000.0 );
54 connect( mLayer, &QgsMapLayer::opacityChanged, this, &QgsLayerTreeOpacityWidget::layerTrChanged );
55}
56
57QSize QgsLayerTreeOpacityWidget::sizeHint() const
58{
59 return QWidget::sizeHint();
60 //return QSize(200,200); // horizontal seems ignored, vertical is used for spacing
61}
62
63void QgsLayerTreeOpacityWidget::sliderValueChanged( int value )
64{
65 Q_UNUSED( value )
66
67 if ( mTimer->isActive() )
68 return;
69 mTimer->start();
70}
71
72void QgsLayerTreeOpacityWidget::updateOpacityFromSlider()
73{
74 if ( !mLayer )
75 return;
76 const int value = mSlider->value();
77 mLayer->setOpacity( value / 1000.0 );
78 mLayer->triggerRepaint();
79}
80
81void QgsLayerTreeOpacityWidget::layerTrChanged()
82{
83 if ( !mLayer )
84 return;
85 mSlider->blockSignals( true );
86 mSlider->setValue( mLayer->opacity() * 1000.0 );
87 mSlider->blockSignals( false );
88}
89
90//
91
92QString QgsLayerTreeOpacityWidget::Provider::id() const
93{
94 return QStringLiteral( "transparency" );
95}
96
97QString QgsLayerTreeOpacityWidget::Provider::name() const
98{
99 return tr( "Opacity slider" );
100}
101
102QgsLayerTreeOpacityWidget *QgsLayerTreeOpacityWidget::Provider::createWidget( QgsMapLayer *layer, int widgetIndex )
103{
104 Q_UNUSED( widgetIndex )
105 return new QgsLayerTreeOpacityWidget( layer );
106}
107
108bool QgsLayerTreeOpacityWidget::Provider::supportsLayer( QgsMapLayer * )
109{
110 return true;
111}
112
static const double UI_SCALE_FACTOR
UI scaling factor.
Definition: qgis.h:2861
Base class for all map layer types.
Definition: qgsmaplayer.h:73
void opacityChanged(double opacity)
Emitted when the layer's opacity is changed, where opacity is a value between 0 (transparent) and 1 (...