74 lines
1.5 KiB
C++
74 lines
1.5 KiB
C++
#include "viewersizer.h"
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ViewerSizer::ViewerSizer(QWidget *parent) :
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QWidget(parent),
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widget_(nullptr),
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aspect_ratio_(0)
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{
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}
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void ViewerSizer::SetWidget(QWidget *widget)
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{
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// Delete any previous widgets occupying this space
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delete widget_;
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widget_ = widget;
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if (widget_ != nullptr) {
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widget_->setParent(this);
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UpdateSize();
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}
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}
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void ViewerSizer::SetChildSize(int width, int height)
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{
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if (height == 0) {
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aspect_ratio_ = 0;
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} else {
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aspect_ratio_ = static_cast<double>(width) / static_cast<double>(height);
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}
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UpdateSize();
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}
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void ViewerSizer::resizeEvent(QResizeEvent *event)
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{
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QWidget::resizeEvent(event);
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UpdateSize();
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}
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void ViewerSizer::UpdateSize()
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{
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if (widget_ == nullptr) {
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return;
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}
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// If the aspect ratio is 0, the widget is always hidden
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if (qIsNull(aspect_ratio_)) {
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widget_->setVisible(false);
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return;
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}
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widget_->setVisible(true);
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double our_aspect_ratio = static_cast<double>(width()) / static_cast<double>(height());
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QPoint child_pos;
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QSize child_size = size();
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if (our_aspect_ratio > aspect_ratio_) {
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// This container is wider than the image, scale by height
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child_size.setWidth(qRound(child_size.height() * aspect_ratio_));
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child_pos.setX(width() / 2 - child_size.width() / 2);
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} else {
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// This container is taller than the image, scale by width
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child_size.setHeight(qRound(child_size.width() / aspect_ratio_));
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child_pos.setY(height() / 2 - child_size.height() / 2);
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}
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widget_->resize(child_size);
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widget_->move(child_pos);
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}
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