137 lines
3.4 KiB
C++
137 lines
3.4 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2022 Olive Team
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#ifndef VIEWERSIZER_H
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#define VIEWERSIZER_H
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#include <olive/core/core.h>
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#include <QScrollBar>
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#include <QWidget>
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namespace olive {
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using namespace core;
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/**
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* @brief A container widget that enforces the aspect ratio of a child widget
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*
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* Using a provided width and height, this widget calculates the aspect ratio and forces the child widget to stay
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* confined to that aspect ratio and centered within the widget.
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*
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* The aspect ratio is calculated width divided by height. If the aspect ratio is zero (either width or height == 0),
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* the widget is hidden until a valid size is provided.
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*/
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class ViewerSizer : public QWidget
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{
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Q_OBJECT
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public:
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ViewerSizer(QWidget* parent = nullptr);
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/**
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* @brief Set the widget to be adjusted by this widget
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*
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* ViewerSizer takes ownership of this widget. If a widget was previously set, it is destroyed.
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*/
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void SetWidget(QWidget* widget);
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QSize GetContainerSize() const;
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static constexpr int kZoomLevelCount = 10;
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static constexpr double kZoomLevels[kZoomLevelCount] = {0.05, 0.1, 0.25, 0.5, 0.75, 1.0, 1.5, 2.0, 4.0, 8.0};
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public slots:
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/**
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* @brief Set resolution to use
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*
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* This is not the actual resolution of the viewer, it's used to calculate the aspect ratio
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*/
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void SetChildSize(int width, int height);
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/**
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* @brief Set pixel aspect ratio
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*/
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void SetPixelAspectRatio(const rational& pixel_aspect);
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/**
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* @brief Set the zoom value of the child widget
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*
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* The number is an integer percentage (100 = 100%). Set to 0 to auto-fit.
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*/
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void SetZoom(double percent);
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void SetZoomAnchored(double percent, double cursor_x, double cursor_y);
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void HandDragMove(int x, int y);
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virtual bool eventFilter(QObject *watched, QEvent *event) override;
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signals:
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void RequestScale(const QMatrix4x4& matrix);
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void RequestTranslate(const QMatrix4x4& matrix);
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protected:
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/**
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* @brief Listen for resize events to ensure the child widget remains correctly sized
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*/
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virtual void resizeEvent(QResizeEvent *event) override;
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private:
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/**
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* @brief Main sizing function, resizes widget_ to fit aspect_ratio_ (or hides if aspect ratio is 0)
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*/
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void UpdateSize();
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int GetZoomedValue(int value);
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double GetRealCurrentZoom() const;
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/**
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* @brief Reference to widget
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*
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* If this is nullptr, all sizing operations are no-ops
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*/
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QWidget* widget_;
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/**
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* @brief Internal resolution values
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*/
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int width_;
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int height_;
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rational pixel_aspect_;
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/**
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* @brief Internal zoom value
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*/
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double zoom_;
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double current_widget_scale_;
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QScrollBar* horiz_scrollbar_;
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QScrollBar* vert_scrollbar_;
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private slots:
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void ScrollBarMoved();
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};
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}
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#endif // VIEWERSIZER_H
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