Code/Tools/Libs/GuiFoundation/Widgets/Implementation/GraphicsView.cpp - dev - redgpu/ezEngine

Code/Tools/Libs/GuiFoundation/Widgets/Implementation/GraphicsView.cpp
149 строк3 KB
Ingrater
More clang-tidy static analysis fixes (#984)
19 июн 2023, 21:37
19 июн 2023, 21:37ca42db7
#include <GuiFoundation/GuiFoundationPCH.h>

#include <Foundation/Math/Math.h>
#include <GuiFoundation/Widgets/Curve1DEditorWidget.moc.h>
#include <GuiFoundation/Widgets/GraphicsView.moc.h>
#include <QScrollBar>
#include <QTextOption>
#include <qevent.h>

ezQtGraphicsView::ezQtGraphicsView(QWidget* pParent /*= nullptr*/)
  : QGraphicsView(pParent)
{
  m_fZoom = 50.0f;
  m_fMinZoom = 10.0f;
  m_fMaxZoom = 1000.0f;
  m_bPanning = false;
  m_bDragging = false;
  m_bForwardMouseEvents = true;

  setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
  setDragMode(QGraphicsView::DragMode::RubberBandDrag);
  setTransformationAnchor(QGraphicsView::ViewportAnchor::AnchorUnderMouse);
  setResizeAnchor(QGraphicsView::ViewportAnchor::AnchorUnderMouse);

  UpdateTransform();
}

void ezQtGraphicsView::wheelEvent(QWheelEvent* e)
{
  if (e->angleDelta().y() > 0)
  {
    m_fZoom *= 1.2f;
  }
  else
  {
    m_fZoom *= 1.0f / 1.2f;
  }

  UpdateTransform();
}


void ezQtGraphicsView::mousePressEvent(QMouseEvent* e)
{
  if (e->buttons() == Qt::RightButton) // right button only
  {
    m_LastGlobalMouseMovePos = e->globalPosition().toPoint();
    m_bPanning = true;
    m_bForwardMouseEvents = false;
  }

  if (!m_bForwardMouseEvents || e->button() != Qt::LeftButton)
  {
    e->accept();
    return;
  }

  if (!m_bDragging)
  {
    m_bDragging = true;
    Q_EMIT BeginDrag();
  }

  QGraphicsView::mousePressEvent(e);
}

void ezQtGraphicsView::mouseReleaseEvent(QMouseEvent* e)
{
  if (!e->buttons().testFlag(Qt::RightButton))
  {
    m_bPanning = false;
  }

  if (!m_bForwardMouseEvents || e->button() != Qt::LeftButton)
  {
    if (e->buttons() == Qt::NoButton)
    {
      // reset, but don't forward this one
      m_bForwardMouseEvents = true;
    }

    e->accept();
    return;
  }

  QGraphicsView::mouseReleaseEvent(e);

  if (m_bDragging)
  {
    m_bDragging = false;
    Q_EMIT EndDrag();
  }
}

void ezQtGraphicsView::mouseMoveEvent(QMouseEvent* e)
{
  if (m_bPanning)
  {
    const QPoint diff = e->globalPosition().toPoint() - m_LastGlobalMouseMovePos;
    m_LastGlobalMouseMovePos = e->globalPosition().toPoint();

    // Copied from QGraphicsView
    QScrollBar* hBar = horizontalScrollBar();
    QScrollBar* vBar = verticalScrollBar();
    hBar->setValue(hBar->value() + (isRightToLeft() ? diff.x() : -diff.x()));
    vBar->setValue(vBar->value() - diff.y());
  }

  if (!m_bForwardMouseEvents /*|| (e->buttons() != Qt::LeftButton && e->buttons() != Qt::NoButton)*/) // only forward if EXACTLY the left
                                                                                                      // button is down
  {
    e->accept();
    return;
  }

  QGraphicsView::mouseMoveEvent(e);
}

void ezQtGraphicsView::keyPressEvent(QKeyEvent* e)
{
  if (e->key() == Qt::Key_Delete)
  {
    Q_EMIT DeleteCPs();

    e->accept();
    return;
  }
}

void ezQtGraphicsView::SetZoom(float fZoom)
{
  m_fZoom = fZoom;
  UpdateTransform();
}

void ezQtGraphicsView::SetZoomLimits(float fMinZoom, float fMaxZoom)
{
  m_fMinZoom = ezMath::Min(fMinZoom, fMaxZoom);
  m_fMaxZoom = ezMath::Max(fMinZoom, fMaxZoom);

  UpdateTransform();
}

void ezQtGraphicsView::UpdateTransform()
{
  m_fZoom = ezMath::Clamp(m_fZoom, m_fMinZoom, m_fMaxZoom);

  setTransform(QTransform::fromScale(m_fZoom, -m_fZoom));
}