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abstractpropertywidget.h 4.44 KB
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// ================================================================================================
// 
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// This file is part of the CAMPVis Software Framework.
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// 
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// If not explicitly stated otherwise: Copyright (C) 2012-2015, all rights reserved,
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//      Christian Schulte zu Berge <christian.szb@in.tum.de>
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//      Chair for Computer Aided Medical Procedures
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//      Technische Universitaet Muenchen
//      Boltzmannstr. 3, 85748 Garching b. Muenchen, Germany
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// 
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// For a full list of authors and contributors, please refer to the file "AUTHORS.txt".
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// 
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file 
// except in compliance with the License. You may obtain a copy of the License at
// 
// http://www.apache.org/licenses/LICENSE-2.0
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// 
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// Unless required by applicable law or agreed to in writing, software distributed under the 
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, 
// either express or implied. See the License for the specific language governing permissions 
// and limitations under the License.
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// 
// ================================================================================================

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#ifndef ABSTRACTPROPERTYWIDGET_H__
#define ABSTRACTPROPERTYWIDGET_H__

#include "sigslot/sigslot.h"
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#include "tbb/atomic.h"
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#include "application/applicationapi.h"

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#include <QBoxLayout>
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#include <QLabel>
#include <QWidget>
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namespace campvis {
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    class AbstractProperty;
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    class DataContainer;
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    /**
     * Abstract base class for property widgets.
     */
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    class CAMPVIS_APPLICATION_API AbstractPropertyWidget : public QWidget, public sigslot::has_slots {
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        Q_OBJECT;

    public:
        /**
         * Creates a new PropertyWidget for the property \a property.
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         *
         * If displayBoxed is true, the widget is displayed vertically in a QGroupBox.
         *
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         * \param   property        The property the widget shall handle.
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         * \param   displayBoxed    Should the widget be displayed in a group box?
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         * \param   dataContainer   DataContainer to use (optional), defaults to nullptr. However, some derived classed might need a valid pointer here!
         * \param   parent          Parent Qt widget, defaults to nullptr.
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         */
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        AbstractPropertyWidget(AbstractProperty* property, bool displayBoxed = false, DataContainer* dataContainer = nullptr, QWidget* parent = nullptr);
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        /**
         * Destructor
         */
        virtual ~AbstractPropertyWidget();

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        /**
         * Shows or hides the label that appears on the left hand side of the widget.
         *
         * \param   isVisible       Wether the label should be shown or not
         */
        void setLabelVisibile(bool isVisible);

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    protected:
        /**
         * Adds a widget to the local Qt layout.
         */
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        void addWidget(QWidget* widget, int stretch = 1);
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        AbstractProperty* _property;    ///< The property this widget handles
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        DataContainer* _dataContainer;  ///< DataContainer to use (e.g. to populate GUI), may be 0!
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        /// Semaphore acts as flag whether the widget shall ignore incoming signals from properties being updated.
        tbb::atomic<int> _ignorePropertyUpdates;

    protected slots:
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        /**
         * Gets called when the property has changed, so that widget can update its state.
         */
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        virtual void updateWidgetFromProperty() {};
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    signals:
        /**
         * Internal signal used to update the property widget in a thread-safe way.
         *
         * This class' \ref onPropertyChanged() slot is invoked from non-GUI threads. As a result,
         * \ref updateWidgetFromProperty() couldn't access any Qt widgets safely if it was called from there directly,
         * because it would execute in a non-GUI thread. However, if we invoke \ref updateWidgetFromProperty() via
         * a signal-slot connection with \ref s_propertyChanged(), Qt takes care of queueing slot accesses in the GUI
         * thread for us.
         */
        void s_propertyChanged(const AbstractProperty* property);
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    private:
        /// Slot getting called when the property has changed, so that the widget can be updated.
        virtual void onPropertyChanged(const AbstractProperty* property);

        QBoxLayout* _layout;
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        QLabel* _titleLabel;
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    };
}

#endif // ABSTRACTPROPERTYWIDGET_H__