QGIS API Documentation 3.29.0-Master (006c3c0232)
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
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 if ( mMarqueeZoom )
37 {
38 mMarqueeZoom = false;
39 mRubberBand->finish();
40 }
41 event->ignore();
42 return;
43 }
44
45 mMousePressStartPos = event->pos();
46 if ( event->modifiers() & Qt::AltModifier )
47 {
48 //zoom out action, so zoom out and recenter on clicked point
49 const double scaleFactor = 2;
50 //get current visible part of scene
51 const QRect viewportRect( 0, 0, view()->viewport()->width(), view()->viewport()->height() );
52 QgsRectangle visibleRect = QgsRectangle( view()->mapToScene( viewportRect ).boundingRect() );
53
54 visibleRect.scale( scaleFactor, event->layoutPoint().x(), event->layoutPoint().y() );
55 const QRectF boundsRect = visibleRect.toRectF();
56
57 //zoom view to fit desired bounds
58 view()->fitInView( boundsRect, Qt::KeepAspectRatio );
60 view()->viewChanged();
61 }
62 else
63 {
64 //zoom in action
65 startMarqueeZoom( event->layoutPoint() );
66 }
67}
68
70{
71 if ( !mMarqueeZoom )
72 {
73 event->ignore();
74 return;
75 }
76
77 mRubberBand->update( event->layoutPoint(), Qt::KeyboardModifiers() );
78}
79
81{
82 if ( !mMarqueeZoom || event->button() != Qt::LeftButton )
83 {
84 event->ignore();
85 return;
86 }
87
88 mMarqueeZoom = false;
89 QRectF newBoundsRect = mRubberBand->finish( event->layoutPoint() );
90
91 // click? or click-and-drag?
92 if ( !isClickAndDrag( mMousePressStartPos, event->pos() ) )
93 {
94 //just a click, so zoom to clicked point and recenter
95 const double scaleFactor = 0.5;
96 //get current visible part of scene
97 const QRect viewportRect( 0, 0, view()->viewport()->width(), view()->viewport()->height() );
98 QgsRectangle visibleRect = QgsRectangle( view()->mapToScene( viewportRect ).boundingRect() );
99
100 visibleRect.scale( scaleFactor, event->layoutPoint().x(), event->layoutPoint().y() );
101 newBoundsRect = visibleRect.toRectF();
102 }
103
104 //zoom view to fit desired bounds
105 view()->fitInView( newBoundsRect, Qt::KeepAspectRatio );
107 view()->viewChanged();
108}
109
111{
112 //respond to changes in the alt key status and update cursor accordingly
113 if ( !event->isAutoRepeat() )
114 {
115
116 view()->viewport()->setCursor( ( event->modifiers() & Qt::AltModifier ) ?
117 QgsApplication::getThemeCursor( QgsApplication::Cursor::ZoomOut ) :
118 QgsApplication::getThemeCursor( QgsApplication::Cursor::ZoomIn ) );
119 }
120 event->ignore();
121}
122
124{
125 //respond to changes in the alt key status and update cursor accordingly
126 if ( !event->isAutoRepeat() )
127 {
128
129 view()->viewport()->setCursor( ( event->modifiers() & Qt::AltModifier ) ?
130 QgsApplication::getThemeCursor( QgsApplication::Cursor::ZoomOut ) :
131 QgsApplication::getThemeCursor( QgsApplication::Cursor::ZoomIn ) );
132 }
133 event->ignore();
134}
135
137{
138 if ( mMarqueeZoom )
139 {
140 mMarqueeZoom = false;
141 mRubberBand->finish();
142 }
144}
145
146void QgsLayoutViewToolZoom::startMarqueeZoom( QPointF scenePoint )
147{
148 mMarqueeZoom = true;
149
150 mRubberBandStartPos = scenePoint;
151 mRubberBand->start( scenePoint, Qt::KeyboardModifiers() );
152}
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:51
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:256
QRectF toRectF() const
Returns a QRectF with same coordinates as the rectangle.
Definition: qgsrectangle.h:500