nodeview: implemented minimap

2021-07-09 21:43:19 -07:00
parent ddee0f97d6
commit 94e6fa843c
5 changed files with 276 additions and 0 deletions
@@ -0,0 +1,141 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2021 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#include "nodeviewminimap.h"
+
+#include <QMouseEvent>
+
+namespace olive {
+
+#define super QGraphicsView
+
+NodeViewMiniMap::NodeViewMiniMap(NodeViewScene *scene, QWidget *parent) :
+  super(parent),
+  resizing_(false)
+{
+  connect(scene, &QGraphicsScene::sceneRectChanged, this, &NodeViewMiniMap::SceneChanged);
+  setScene(scene);
+
+  setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+  setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+  setViewportUpdateMode(FullViewportUpdate);
+
+  QMetaObject::invokeMethod(this, &NodeViewMiniMap::SetDefaultSize, Qt::QueuedConnection);
+
+  resize_triangle_sz_ = fontMetrics().height() / 2;
+}
+
+void NodeViewMiniMap::SetViewportRect(const QPolygonF &rect)
+{
+  viewport_rect_ = rect;
+
+  viewport()->update();
+}
+
+void NodeViewMiniMap::drawForeground(QPainter *painter, const QRectF &rect)
+{
+  super::drawForeground(painter, rect);
+
+  QColor viewport_color = palette().text().color();
+
+  // Draw resize triangle
+  painter->save();
+  painter->resetTransform();
+
+  QPointF triangle[3] = {QPointF(0, 0), QPointF(resize_triangle_sz_, 0), QPointF(0, resize_triangle_sz_)};
+  painter->setBrush(viewport_color);
+  painter->setPen(viewport_color);
+  painter->drawPolygon(triangle, 3);
+
+  painter->restore();
+
+  // Draw viewport rectangle
+  viewport_color.setAlphaF(0.25);
+  painter->setBrush(viewport_color);
+
+  painter->drawPolygon(viewport_rect_);
+}
+
+void NodeViewMiniMap::resizeEvent(QResizeEvent *event)
+{
+  super::resizeEvent(event);
+
+  emit Resized();
+
+  SceneChanged(sceneRect());
+}
+
+void NodeViewMiniMap::mousePressEvent(QMouseEvent *event)
+{
+  if (event->button() == Qt::LeftButton) {
+    if (event->pos().x() <= resize_triangle_sz_ && event->pos().y() <= resize_triangle_sz_) {
+      // Resizing!
+      resizing_ = true;
+      resize_anchor_ = QCursor::pos();
+    } else {
+      EmitMoveSignal(event);
+    }
+  }
+}
+
+void NodeViewMiniMap::mouseMoveEvent(QMouseEvent *event)
+{
+  if (event->buttons() & Qt::LeftButton) {
+    if (resizing_) {
+      QPointF movement = QCursor::pos() - resize_anchor_;
+      resize(QSize(width() - movement.x(), height() - movement.y()));
+      resize_anchor_ = QCursor::pos();
+    } else {
+      EmitMoveSignal(event);
+    }
+  }
+}
+
+void NodeViewMiniMap::mouseReleaseEvent(QMouseEvent *event)
+{
+  resizing_ = false;
+}
+
+void NodeViewMiniMap::SceneChanged(const QRectF &bounding)
+{
+  double x_scale = double(this->width()) / bounding.width();
+  double y_scale = double(this->height()) / bounding.height();
+
+  double min_scale = qMin(x_scale, y_scale);
+
+  QTransform transform;
+  transform.scale(min_scale, min_scale);
+
+  setTransform(transform);
+}
+
+void NodeViewMiniMap::SetDefaultSize()
+{
+  if (parentWidget()) {
+    resize(parentWidget()->width()/4, parentWidget()->height()/4);
+  }
+}
+
+void NodeViewMiniMap::EmitMoveSignal(QMouseEvent *event)
+{
+  emit MoveToScenePoint(mapToScene(event->pos()));
+}
+
+}