QGIS API Documentation 3.27.0-Master (f261cc1f8b)
qgslayoutviewtoolpan.cpp
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1/***************************************************************************
2 qgslayoutviewtoolpan.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"
19#include <QScrollBar>
20
22 : QgsLayoutViewTool( view, tr( "Pan" ) )
23{
24 setCursor( Qt::OpenHandCursor );
25}
26
28{
29 mMousePressStartPos = event->pos();
30
31 if ( event->button() != Qt::LeftButton )
32 {
33 event->ignore();
34 return;
35 }
36
37 mIsPanning = true;
38 mLastMousePos = event->pos();
39 view()->setCursor( Qt::ClosedHandCursor );
40}
41
43{
44 if ( !mIsPanning )
45 {
46 event->ignore();
47 return;
48 }
49
50 view()->horizontalScrollBar()->setValue( view()->horizontalScrollBar()->value() - ( event->x() - mLastMousePos.x() ) );
51 view()->verticalScrollBar()->setValue( view()->verticalScrollBar()->value() - ( event->y() - mLastMousePos.y() ) );
52 mLastMousePos = event->pos();
53 view()->viewChanged();
54}
55
57{
58 const bool clickOnly = !isClickAndDrag( mMousePressStartPos, event->pos() );
59
60 if ( event->button() == Qt::MiddleButton && clickOnly )
61 {
62 //middle mouse button click = recenter on point
63
64 //get current visible part of scene
65 const QRect viewportRect( 0, 0, view()->viewport()->width(), view()->viewport()->height() );
66 QgsRectangle visibleRect = QgsRectangle( view()->mapToScene( viewportRect ).boundingRect() );
67 const QPointF scenePoint = event->layoutPoint();
68 visibleRect.scale( 1, scenePoint.x(), scenePoint.y() );
69 const QRectF boundsRect = visibleRect.toRectF();
70
71 //zoom view to fit desired bounds
72 view()->fitInView( boundsRect, Qt::KeepAspectRatio );
74 view()->viewChanged();
75 return;
76 }
77
78 if ( !mIsPanning || event->button() != Qt::LeftButton )
79 {
81 view()->viewChanged();
82 event->ignore();
83 return;
84 }
85
86 mIsPanning = false;
87 view()->setCursor( Qt::OpenHandCursor );
88}
89
91{
92 mIsPanning = false;
94}
A QgsLayoutViewMouseEvent is the result of a user interaction with the mouse on a QgsLayoutView.
void layoutPressEvent(QgsLayoutViewMouseEvent *event) override
Mouse press event for overriding.
void deactivate() override
Called when tool is deactivated.
void layoutReleaseEvent(QgsLayoutViewMouseEvent *event) override
Mouse release event for overriding.
QgsLayoutViewToolPan(QgsLayoutView *view)
Constructor for QgsLayoutViewToolPan.
void layoutMoveEvent(QgsLayoutViewMouseEvent *event) override
Mouse move event for overriding.
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:256
QRectF toRectF() const
Returns a QRectF with same coordinates as the rectangle.
Definition: qgsrectangle.h:500