QGIS API Documentation  3.8.0-Zanzibar (11aff65)
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 
16 #include "qgslayoutviewtoolpan.h"
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  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  QRect viewportRect( 0, 0, view()->viewport()->width(), view()->viewport()->height() );
66  QgsRectangle visibleRect = QgsRectangle( view()->mapToScene( viewportRect ).boundingRect() );
67  QPointF scenePoint = event->layoutPoint();
68  visibleRect.scale( 1, scenePoint.x(), scenePoint.y() );
69  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 }
void setCursor(const QCursor &cursor)
Sets a user defined cursor for use when the tool is active.
A rectangle specified with double values.
Definition: qgsrectangle.h:41
A graphical widget to display and interact with QgsLayouts.
Definition: qgslayoutview.h:49
QgsLayoutViewToolPan(QgsLayoutView *view)
Constructor for QgsLayoutViewToolPan.
virtual void deactivate()
Called when tool is deactivated.
void scale(double scaleFactor, const QgsPointXY *c=nullptr)
Scale the rectangle around its center point.
Definition: qgsrectangle.h:235
void deactivate() override
Called when tool is deactivated.
void layoutReleaseEvent(QgsLayoutViewMouseEvent *event) override
Mouse release event for overriding.
QgsLayoutView * 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...
A QgsLayoutViewMouseEvent is the result of a user interaction with the mouse on a QgsLayoutView...
QRectF toRectF() const
Returns a QRectF with same coordinates as the rectangle.
Definition: qgsrectangle.h:457
void layoutMoveEvent(QgsLayoutViewMouseEvent *event) override
Mouse move event for overriding.
void layoutPressEvent(QgsLayoutViewMouseEvent *event) override
Mouse press event for overriding.
void viewChanged()
Updates associated rulers and other widgets after view extent or zoom has changed.
Abstract base class for all layout view tools.
void emitZoomLevelChanged()
Emits the zoomLevelChanged() signal.