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Added zoom and automatic refresh of dependency graph view.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| /*************************************************************************** | ||
| * Copyright (c) 2015 Pavel Strakhov <ri@idzaaus.org> * | ||
| * Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name> * | ||
| * * | ||
| * This file is part of the FreeCAD CAx development system. * | ||
| * * | ||
| * This library is free software; you can redistribute it and/or * | ||
| * modify it under the terms of the GNU Library General Public * | ||
| * License as published by the Free Software Foundation; either * | ||
| * version 2 of the License, or (at your option) any later version. * | ||
| * * | ||
| * This library is distributed in the hope that it will be useful, * | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of * | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | ||
| * GNU Library General Public License for more details. * | ||
| * * | ||
| * You should have received a copy of the GNU Library General Public * | ||
| * License along with this library; see the file COPYING.LIB. If not, * | ||
| * write to the Free Software Foundation, Inc., 59 Temple Place, * | ||
| * Suite 330, Boston, MA 02111-1307, USA * | ||
| * * | ||
| ***************************************************************************/ | ||
|
|
||
| /* | ||
| * Based on | ||
| * | ||
| * http://stackoverflow.com/questions/19113532/qgraphicsview-zooming-in-and-out-under-mouse-position-using-mouse-wheel | ||
| * | ||
| * Re-licensed to LGPL after having contacted original author by e-mail. | ||
| * | ||
| */ | ||
|
|
||
| #include "PreCompiled.h" | ||
| #ifndef _PreComp_ | ||
| # include <QGraphicsView> | ||
| # include <QMouseEvent> | ||
| # include <QApplication> | ||
| # include <QScrollBar> | ||
| # include <qmath.h> | ||
| #endif | ||
|
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| #include <GraphicsViewZoom.h> | ||
|
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| GraphicsViewZoom::GraphicsViewZoom(QGraphicsView* view) | ||
| : QObject(view), _view(view) | ||
| { | ||
| _view->viewport()->installEventFilter(this); | ||
| _view->setMouseTracking(true); | ||
| _modifiers = Qt::ControlModifier; | ||
| _zoom_factor_base = 1.0015; | ||
| } | ||
|
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| void GraphicsViewZoom::gentle_zoom(double factor) { | ||
| _view->scale(factor, factor); | ||
| _view->centerOn(target_scene_pos); | ||
| QPointF delta_viewport_pos = target_viewport_pos - QPointF(_view->viewport()->width() / 2.0, | ||
| _view->viewport()->height() / 2.0); | ||
| QPointF viewport_center = _view->mapFromScene(target_scene_pos) - delta_viewport_pos; | ||
| _view->centerOn(_view->mapToScene(viewport_center.toPoint())); | ||
| } | ||
|
|
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| void GraphicsViewZoom::set_modifiers(Qt::KeyboardModifiers modifiers) { | ||
| _modifiers = modifiers; | ||
|
|
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| } | ||
|
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| void GraphicsViewZoom::set_zoom_factor_base(double value) { | ||
| _zoom_factor_base = value; | ||
| } | ||
|
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| bool GraphicsViewZoom::eventFilter(QObject *object, QEvent *event) { | ||
| if (event->type() == QEvent::MouseMove) { | ||
| QMouseEvent* mouse_event = static_cast<QMouseEvent*>(event); | ||
| QPointF delta = target_viewport_pos - mouse_event->pos(); | ||
| if (qAbs(delta.x()) > 5 || qAbs(delta.y()) > 5) { | ||
| target_viewport_pos = mouse_event->pos(); | ||
| target_scene_pos = _view->mapToScene(mouse_event->pos()); | ||
| } | ||
| } else if (event->type() == QEvent::Wheel) { | ||
| QWheelEvent* wheel_event = static_cast<QWheelEvent*>(event); | ||
| if (QApplication::keyboardModifiers() == _modifiers) { | ||
| if (wheel_event->orientation() == Qt::Vertical) { | ||
| double angle = wheel_event->delta(); | ||
| double factor = qPow(_zoom_factor_base, angle); | ||
| gentle_zoom(factor); | ||
| return true; | ||
| } | ||
| } | ||
| } | ||
| Q_UNUSED(object); | ||
| return false; | ||
| } | ||
|
|
||
| #include "moc_GraphicsViewZoom.cpp" |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| /*************************************************************************** | ||
| * Copyright (c) 2015 Pavel Strakhov <ri@idzaaus.org> * | ||
| * Copyright (c) 2015 Eivind Kvedalen <eivind@kvedalen.name> * | ||
| * * | ||
| * This file is part of the FreeCAD CAx development system. * | ||
| * * | ||
| * This library is free software; you can redistribute it and/or * | ||
| * modify it under the terms of the GNU Library General Public * | ||
| * License as published by the Free Software Foundation; either * | ||
| * version 2 of the License, or (at your option) any later version. * | ||
| * * | ||
| * This library is distributed in the hope that it will be useful, * | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of * | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | ||
| * GNU Library General Public License for more details. * | ||
| * * | ||
| * You should have received a copy of the GNU Library General Public * | ||
| * License along with this library; see the file COPYING.LIB. If not, * | ||
| * write to the Free Software Foundation, Inc., 59 Temple Place, * | ||
| * Suite 330, Boston, MA 02111-1307, USA * | ||
| * * | ||
| ***************************************************************************/ | ||
|
|
||
| /* | ||
| * Based on | ||
| * | ||
| * http://stackoverflow.com/questions/19113532/qgraphicsview-zooming-in-and-out-under-mouse-position-using-mouse-wheel | ||
| * | ||
| * Re-licensed to LGPL after having contacted original author by e-mail. | ||
| * | ||
| */ | ||
|
|
||
| #ifndef GRAPHICSVIEWZOOM_H | ||
| #define GRAPHICSVIEWZOOM_H | ||
|
|
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| #include <QObject> | ||
| #include <QPointF> | ||
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| /*! | ||
| * This class adds ability to zoom QGraphicsView using mouse wheel. The point under cursor | ||
| * remains motionless while it's possible. | ||
| * | ||
| * Note that it becomes not possible when the scene's | ||
| * size is not large enough comparing to the viewport size. QGraphicsView centers the picture | ||
| * when it's smaller than the view. And QGraphicsView's scrolls boundaries don't allow to | ||
| * put any picture point at any viewport position. | ||
| * | ||
| * When the user starts scrolling, this class remembers original scene position and | ||
| * keeps it until scrolling is completed. It's better than getting original scene position at | ||
| * each scrolling step because that approach leads to position errors due to before-mentioned | ||
| * positioning restrictions. | ||
| * | ||
| * When zommed using scroll, this class emits zoomed() signal. | ||
| * | ||
| * Usage: | ||
| * | ||
| * new GraphicsViewZoom(view); | ||
| * | ||
| * The object will be deleted automatically when the view is deleted. | ||
| * | ||
| * You can set keyboard modifiers used for zooming using set_modified(). Zooming will be | ||
| * performed only on exact match of modifiers combination. The default modifier is Ctrl. | ||
| * | ||
| * You can change zoom velocity by calling set_zoom_factor_base(). | ||
| * Zoom coefficient is calculated as zoom_factor_base^angle_delta | ||
| * (see QWheelEvent::angleDelta). | ||
| * The default zoom factor base is 1.0015. | ||
| */ | ||
|
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| class QGraphicsView; | ||
|
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| class GraphicsViewZoom : public QObject { | ||
| Q_OBJECT | ||
| public: | ||
| GraphicsViewZoom(QGraphicsView* view); | ||
| void gentle_zoom(double factor); | ||
| void set_modifiers(Qt::KeyboardModifiers modifiers); | ||
| void set_zoom_factor_base(double value); | ||
|
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| private: | ||
| QGraphicsView* _view; | ||
| Qt::KeyboardModifiers _modifiers; | ||
| double _zoom_factor_base; | ||
| QPointF target_scene_pos, target_viewport_pos; | ||
| bool eventFilter(QObject* object, QEvent* event); | ||
| }; | ||
|
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| #endif // GRAPHICSVIEWZOOM_H |
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