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44 lines
1.5 KiB
C++
44 lines
1.5 KiB
C++
// Copyright 2018 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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// Based on:
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// https://stackoverflow.com/questions/30005540/keeping-the-aspect-ratio-of-a-sub-classed-qwidget-during-resize
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#include "DolphinQt/QtUtils/AspectRatioWidget.h"
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#include <QBoxLayout>
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#include <QResizeEvent>
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AspectRatioWidget::AspectRatioWidget(QWidget* widget, float width, float height, QWidget* parent)
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: QWidget(parent), m_ar_width(width), m_ar_height(height)
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{
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m_layout = new QBoxLayout(QBoxLayout::LeftToRight, this);
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// add spacer, then your widget, then spacer
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m_layout->addItem(new QSpacerItem(0, 0));
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m_layout->addWidget(widget);
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m_layout->addItem(new QSpacerItem(0, 0));
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}
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void AspectRatioWidget::resizeEvent(QResizeEvent* event)
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{
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float aspect_ratio = static_cast<float>(event->size().width()) / event->size().height();
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int widget_stretch, outer_stretch;
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if (aspect_ratio > (m_ar_width / m_ar_height)) // too wide
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{
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m_layout->setDirection(QBoxLayout::LeftToRight);
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widget_stretch = height() * (m_ar_width / m_ar_height); // i.e., my width
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outer_stretch = (width() - widget_stretch) / 2 + 0.5;
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}
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else // too tall
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{
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m_layout->setDirection(QBoxLayout::TopToBottom);
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widget_stretch = width() * (m_ar_height / m_ar_width); // i.e., my height
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outer_stretch = (height() - widget_stretch) / 2 + 0.5;
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}
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m_layout->setStretch(0, outer_stretch);
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m_layout->setStretch(1, widget_stretch);
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m_layout->setStretch(2, outer_stretch);
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}
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