QGIS API Documentation 3.29.0-Master (006c3c0232)
qgsmodelviewtoolpan.cpp
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1/***************************************************************************
2 qgsmodelviewtoolpan.cpp
3 ------------------------------------
4 Date : March 2020
5 Copyright : (C) 2020 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 "qgsmodelviewtoolpan.h"
19#include <QScrollBar>
20
21QgsModelViewToolPan::QgsModelViewToolPan( QgsModelGraphicsView *view )
22 : QgsModelViewTool( 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}
54
56{
57 const bool clickOnly = !isClickAndDrag( mMousePressStartPos, event->pos() );
58
59 if ( event->button() == Qt::MiddleButton && clickOnly )
60 {
61 //middle mouse button click = recenter on point
62
63 //get current visible part of scene
64 const QRect viewportRect( 0, 0, view()->viewport()->width(), view()->viewport()->height() );
65 QgsRectangle visibleRect = QgsRectangle( view()->mapToScene( viewportRect ).boundingRect() );
66 const QPointF scenePoint = event->modelPoint();
67 visibleRect.scale( 1, scenePoint.x(), scenePoint.y() );
68 const QRectF boundsRect = visibleRect.toRectF();
69
70 //zoom view to fit desired bounds
71 view()->fitInView( boundsRect, Qt::KeepAspectRatio );
72 return;
73 }
74
75 if ( !mIsPanning || event->button() != Qt::LeftButton )
76 {
77 event->ignore();
78 return;
79 }
80
81 mIsPanning = false;
82 view()->setCursor( Qt::OpenHandCursor );
83}
84
86{
87 mIsPanning = false;
89}
A QgsModelViewMouseEvent is the result of a user interaction with the mouse on a QgsModelGraphicsView...
void modelMoveEvent(QgsModelViewMouseEvent *event) override
Mouse move event for overriding.
void deactivate() override
Called when tool is deactivated.
void modelPressEvent(QgsModelViewMouseEvent *event) override
Mouse press event for overriding.
QgsModelViewToolPan(QgsModelGraphicsView *view)
Constructor for QgsModelViewToolPan.
void modelReleaseEvent(QgsModelViewMouseEvent *event) override
Mouse release event for overriding.
Abstract base class for all model designer view tools.
QgsModelGraphicsView * view() const
Returns the view associated with the tool.
bool isClickAndDrag(QPoint startViewPoint, QPoint endViewPoint) const
Returns true if a mouse press/release operation which started at startViewPoint and ended at endViewP...
void setCursor(const QCursor &cursor)
Sets a user defined cursor for use when the tool is active.
virtual void deactivate()
Called when tool is deactivated.
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