QGIS API Documentation 3.41.0-Master (3440c17df1d)
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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"
17#include "moc_qgsmodelviewtoolpan.cpp"
20#include <QScrollBar>
21
22QgsModelViewToolPan::QgsModelViewToolPan( QgsModelGraphicsView *view )
23 : QgsModelViewTool( view, tr( "Pan" ) )
24{
25 setCursor( Qt::OpenHandCursor );
26}
27
29{
30 mMousePressStartPos = event->pos();
31
32 if ( event->button() != Qt::LeftButton )
33 {
34 event->ignore();
35 return;
36 }
37
38 mIsPanning = true;
39 mLastMousePos = event->pos();
40 view()->viewport()->setCursor( Qt::ClosedHandCursor );
41}
42
44{
45 if ( !mIsPanning )
46 {
47 event->ignore();
48 return;
49 }
50
51 view()->horizontalScrollBar()->setValue( view()->horizontalScrollBar()->value() - ( event->x() - mLastMousePos.x() ) );
52 view()->verticalScrollBar()->setValue( view()->verticalScrollBar()->value() - ( event->y() - mLastMousePos.y() ) );
53 mLastMousePos = event->pos();
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->modelPoint();
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 );
73 return;
74 }
75
76 if ( !mIsPanning || event->button() != Qt::LeftButton )
77 {
78 event->ignore();
79 return;
80 }
81
82 mIsPanning = false;
83 view()->viewport()->setCursor( Qt::OpenHandCursor );
84}
85
87{
88 mIsPanning = false;
90}
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.
void scale(double scaleFactor, const QgsPointXY *c=nullptr)
Scale the rectangle around its center point.
QRectF toRectF() const
Returns a QRectF with same coordinates as the rectangle.