117 lines
2.5 KiB
C++
117 lines
2.5 KiB
C++
#include "viewersizer.h"
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#include <QMatrix4x4>
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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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zoom_(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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width_ = width;
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height_ = height;
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if (!width_ || !height_) {
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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::SetZoom(int percent)
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{
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zoom_ = percent;
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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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QSize child_size;
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QMatrix4x4 child_matrix;
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if (zoom_ <= 0) {
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// If zoom is 0, we auto-fit
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double our_aspect_ratio = static_cast<double>(width()) / static_cast<double>(height());
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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 = QSize(qRound(child_size.height() * aspect_ratio_), height());
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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 = QSize(width(), qRound(child_size.width() / aspect_ratio_));
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}
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} else {
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float x_scale = 1.0f;
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float y_scale = 1.0f;
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int zoomed_width = qRound(width_ * static_cast<double>(zoom_) * 0.01);
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int zoomed_height = qRound(height_ * static_cast<double>(zoom_) * 0.01);
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if (zoomed_width > width()) {
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x_scale = static_cast<double>(zoomed_width) / static_cast<double>(width());
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zoomed_width = width();
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}
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if (zoomed_height > height()) {
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y_scale = static_cast<double>(zoomed_height) / static_cast<double>(height());
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zoomed_height = height();
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}
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// Rather than make a huge surface, we still crop at our width/height and then signal a matrix
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child_matrix.scale(x_scale, y_scale, 1.0F);
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child_size = QSize(zoomed_width, zoomed_height);
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}
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widget_->resize(child_size);
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widget_->move(width() / 2 - child_size.width() / 2, height() / 2 - child_size.height() / 2);
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emit RequestMatrix(child_matrix);
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}
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