Thomas Wilshaw
7617ddabe3
The translation needs to be scaled relative to the zoom percentage so we get sensible movement when dragging. Dragging is also disabled when the image is smaller than the container widget. Re-orders the initialisation of some variables to stop a compile warning on Travis.
147 lines
3.5 KiB
C++
147 lines
3.5 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2019 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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#include "viewersizer.h"
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#include <QMatrix4x4>
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OLIVE_NAMESPACE_ENTER
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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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emit SendZoomData(false, 0);
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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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// Translation is only active if the image is bigger then the widget
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// See ViewerDisplayWidget::SetZoomData
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bool zoomed_in = false;
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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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zoomed_in = true;
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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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zoomed_in = true;
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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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emit SendZoomData(zoomed_in, zoom_);
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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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OLIVE_NAMESPACE_EXIT
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