QGIS API Documentation  3.18.1-Zürich (202f1bf7e5)
qgslayoutviewtoolzoom.cpp
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1 /***************************************************************************
2  qgslayoutviewtoolzoom.cpp
3  -------------------------
4  Date : July 2017
5  Copyright : (C) 2017 Nyall Dawson
6  Email : nyall dot dawson 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 
16 #include "qgslayoutviewtoolzoom.h"
18 #include "qgslayoutview.h"
20 #include "qgsrectangle.h"
21 #include <QScrollBar>
22 
24  : QgsLayoutViewTool( view, tr( "Pan" ) )
25 {
26  setCursor( QgsApplication::getThemeCursor( QgsApplication::Cursor::ZoomIn ) );
27  mRubberBand.reset( new QgsLayoutViewRectangularRubberBand( view ) );
28  mRubberBand->setBrush( QBrush( QColor( 70, 50, 255, 25 ) ) );
29  mRubberBand->setPen( QPen( QBrush( QColor( 70, 50, 255, 100 ) ), 0 ) );
30 }
31 
33 {
34  if ( event->button() != Qt::LeftButton )
35  {
36  event->ignore();
37  return;
38  }
39 
40  mMousePressStartPos = event->pos();
41  if ( event->modifiers() & Qt::AltModifier )
42  {
43  //zoom out action, so zoom out and recenter on clicked point
44  double scaleFactor = 2;
45  //get current visible part of scene
46  QRect viewportRect( 0, 0, view()->viewport()->width(), view()->viewport()->height() );
47  QgsRectangle visibleRect = QgsRectangle( view()->mapToScene( viewportRect ).boundingRect() );
48 
49  visibleRect.scale( scaleFactor, event->layoutPoint().x(), event->layoutPoint().y() );
50  QRectF boundsRect = visibleRect.toRectF();
51 
52  //zoom view to fit desired bounds
53  view()->fitInView( boundsRect, Qt::KeepAspectRatio );
55  view()->viewChanged();
56  }
57  else
58  {
59  //zoom in action
60  startMarqueeZoom( event->layoutPoint() );
61  }
62 }
63 
65 {
66  if ( !mMarqueeZoom )
67  {
68  event->ignore();
69  return;
70  }
71 
72  mRubberBand->update( event->layoutPoint(), Qt::KeyboardModifiers() );
73 }
74 
76 {
77  if ( !mMarqueeZoom || event->button() != Qt::LeftButton )
78  {
79  event->ignore();
80  return;
81  }
82 
83  mMarqueeZoom = false;
84  QRectF newBoundsRect = mRubberBand->finish( event->layoutPoint() );
85 
86  // click? or click-and-drag?
87  if ( !isClickAndDrag( mMousePressStartPos, event->pos() ) )
88  {
89  //just a click, so zoom to clicked point and recenter
90  double scaleFactor = 0.5;
91  //get current visible part of scene
92  QRect viewportRect( 0, 0, view()->viewport()->width(), view()->viewport()->height() );
93  QgsRectangle visibleRect = QgsRectangle( view()->mapToScene( viewportRect ).boundingRect() );
94 
95  visibleRect.scale( scaleFactor, event->layoutPoint().x(), event->layoutPoint().y() );
96  newBoundsRect = visibleRect.toRectF();
97  }
98 
99  //zoom view to fit desired bounds
100  view()->fitInView( newBoundsRect, Qt::KeepAspectRatio );
102  view()->viewChanged();
103 }
104 
105 void QgsLayoutViewToolZoom::keyPressEvent( QKeyEvent *event )
106 {
107  //respond to changes in the alt key status and update cursor accordingly
108  if ( !event->isAutoRepeat() )
109  {
110 
111  view()->viewport()->setCursor( ( event->modifiers() & Qt::AltModifier ) ?
112  QgsApplication::getThemeCursor( QgsApplication::Cursor::ZoomOut ) :
113  QgsApplication::getThemeCursor( QgsApplication::Cursor::ZoomIn ) );
114  }
115  event->ignore();
116 }
117 
119 {
120  //respond to changes in the alt key status and update cursor accordingly
121  if ( !event->isAutoRepeat() )
122  {
123 
124  view()->viewport()->setCursor( ( event->modifiers() & Qt::AltModifier ) ?
125  QgsApplication::getThemeCursor( QgsApplication::Cursor::ZoomOut ) :
126  QgsApplication::getThemeCursor( QgsApplication::Cursor::ZoomIn ) );
127  }
128  event->ignore();
129 }
130 
132 {
133  if ( mMarqueeZoom )
134  {
135  mMarqueeZoom = false;
136  mRubberBand->finish();
137  }
139 }
140 
141 void QgsLayoutViewToolZoom::startMarqueeZoom( QPointF scenePoint )
142 {
143  mMarqueeZoom = true;
144 
145  mRubberBandStartPos = scenePoint;
146  mRubberBand->start( scenePoint, Qt::KeyboardModifiers() );
147 }
static QCursor getThemeCursor(Cursor cursor)
Helper to get a theme cursor.
A QgsLayoutViewMouseEvent is the result of a user interaction with the mouse on a QgsLayoutView.
QPointF layoutPoint() const
Returns the event point location in layout coordinates.
QgsLayoutViewRectangularRubberBand is rectangular rubber band for use within QgsLayoutView widgets.
void deactivate() override
Called when tool is deactivated.
void layoutReleaseEvent(QgsLayoutViewMouseEvent *event) override
Mouse release event for overriding.
void layoutPressEvent(QgsLayoutViewMouseEvent *event) override
Mouse press event for overriding.
QgsLayoutViewToolZoom(QgsLayoutView *view)
Constructor for QgsLayoutViewToolZoom.
void layoutMoveEvent(QgsLayoutViewMouseEvent *event) override
Mouse move event for overriding.
void keyReleaseEvent(QKeyEvent *event) override
Key release event for overriding.
void keyPressEvent(QKeyEvent *event) override
Key press event for overriding.
bool mMarqueeZoom
Will be true will marquee zoom operation is in progress.
Abstract base class for all layout view tools.
void setCursor(const QCursor &cursor)
Sets a user defined cursor for use when the tool is active.
QgsLayoutView * view() const
Returns the view associated with the tool.
virtual void deactivate()
Called when tool is deactivated.
bool isClickAndDrag(QPoint startViewPoint, QPoint endViewPoint) const
Returns true if a mouse press/release operation which started at startViewPoint and ended at endViewP...
A graphical widget to display and interact with QgsLayouts.
Definition: qgslayoutview.h:50
void viewChanged()
Updates associated rulers and other widgets after view extent or zoom has changed.
void emitZoomLevelChanged()
Emits the zoomLevelChanged() signal.
A rectangle specified with double values.
Definition: qgsrectangle.h:42
void scale(double scaleFactor, const QgsPointXY *c=nullptr)
Scale the rectangle around its center point.
Definition: qgsrectangle.h:235
QRectF toRectF() const
Returns a QRectF with same coordinates as the rectangle.
Definition: qgsrectangle.h:468